fix: use VERCEL_URL by default for secureCookie (#3399)

* fix: improve types for encode/decode functions

* fix: use Awaitable type for encode/decode functions

.github/CODEOWNERS

@@ -1 +1,2 @@
 /types/ @balazsorban44 @lluia
+/__tests__/ @lluia

.github/ISSUE_TEMPLATE/bug_report.yaml

@@ -10,7 +10,13 @@ body:
   - type: markdown
     attributes:
       value: |
-        Thanks for taking the time to fill out this bug report! Please provide the following information:
+        Thanks for taking the time to fill out this bug report!
+        ### Important :exclamation:
+        Please help us maintain this project more efficiently! Before creating the issue make sure you shouldn't be creating it in one the below repos instead:
+        - Docs related: https://github.com/nextauthjs/docs
+        - Adapter related: https://github.com/nextauthjs/adapters
+        
+        If you are in the correct repo, then proceed by providing the following information:
   - type: textarea
     id: description
     attributes: 

.github/ISSUE_TEMPLATE/feature_request.yaml

@@ -9,8 +9,14 @@ body:
   - type: markdown
     attributes:
       value: | 
-        Thank you very much for reaching out to us regarding the awesome feature that you believe should be included in the NextAuth.js library. Please provide the following information:
- 
+        Thank you very much for reaching out to us regarding the awesome feature that you believe should be included in the NextAuth.js library.
+        ### Important :exclamation:
+        Please help us maintain this project more efficiently! Before creating the issue make sure you shouldn't be creating it in one the below repos instead:
+        - Docs related: https://github.com/nextauthjs/docs
+        - Adapter related: https://github.com/nextauthjs/adapters
+        
+        If you are in the correct repo, then proceed by providing the following information:
+  
   - type: textarea
     id: description
     attributes:
@@ -65,4 +71,3 @@ body:
     attributes: 
       value: |
         It takes a lot of work 🏋🏻‍♀️ maintaining a library like `next-auth`; any contribution is more than welcome 💚
-  

.github/labeler.yml

@@ -2,23 +2,15 @@ test:
   - test/**/*
   - types/tests/**/*
 
-documentation:
-  - www/**/*
-  - ./**/*.md
-
 providers:
   - src/providers/**/*
-  - www/docs/configuration/providers.md
   - test/integration/**/*
 
 adapters:
   - src/adapters/**/*
-  - www/docs/schemas/adapters.md
 
 databases:
-  - www/docs/schemas/*.md
   - test/docker/databases/**/*
-  - www/docs/configuration/databases.md
   - test/fixtures/**/*
 
 core:
@@ -29,11 +21,9 @@ style:
 
 client:
   - src/client/**/*
-  - www/docs/getting-started/client.md
 
 pages:
   - src/server/pages/**/*
-  - www/docs/configuration/pages.md
 
 TypeScript:
   - types/**/*

.github/workflows/release.yml

@@ -25,7 +25,7 @@ jobs:
       - name: Build
         run: npm run build
       - name: Run tests
-        run: npm test -- --coverage --verbose && npm run test:types
+        run: npm test -- --coverage --verbose
       - name: Coverage
         uses: codecov/codecov-action@v1
         with:
@@ -66,11 +66,21 @@ jobs:
           node-version: 16
       - name: Dependencies
         uses: bahmutov/npm-install@v1
+      - name: Determine version
+        uses: ./config/version-pr
+        id: determine-version
+        env:
+          PR_NUMBER: ${{ github.event.number }}
       - name: Publish to npm
         run: |
           echo "//registry.npmjs.org/:_authToken=$NPM_TOKEN" >> .npmrc
-          npm run version:pr
           npm publish --access public --tag experimental
         env:
           NPM_TOKEN: ${{ secrets.NPM_TOKEN }}
-          PR_NUMBER: ${{ github.event.number }}
+      - name: Comment version on PR
+        uses: NejcZdovc/comment-pr@v1
+        with:
+          message: "🎉 Experimental release [published on npm](https://www.npmjs.com/package/next-auth/v/${{ env.VERSION }})!\n\n```sh\nnpm i next-auth@${{ env.VERSION }}\n```\n```sh\nyarn add next-auth@${{ env.VERSION }}\n```"
+        env:
+          VERSION: ${{ steps.determine-version.outputs.version }}
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

.gitignore

@@ -20,32 +20,31 @@ node_modules
 .next
 /build
 /dist
-/www/build
 
 # Generated files
 .docusaurus
 .cache-loader
-www/providers.json
-src/providers/index.js
-/internals
+/providers
+/src/providers/oauth-types.ts
+/client
+/css
+/lib
+/core
+/jwt
+/react
 /adapters.d.ts
-/adapters.js
-/client.d.ts
-/client.js
 /index.d.ts
 /index.js
-/jwt.d.ts
-/jwt.js
-/providers.d.ts
-/providers.js
-/errors.js
-/errors.d.ts
+/next
 
 # Development app
-app/next-auth
-app/dist/css
+app/src/css
 app/package-lock.json
 app/yarn.lock
+app/prisma/migrations
+app/prisma/dev.db*
+app/dist
+app/next-auth
 
 # VS
 /.vs/slnx.sqlite-journal
@@ -53,6 +52,9 @@ app/yarn.lock
 /.vs
 .vscode
 
+# Jetbrains
+.idea
+
 # GitHub Actions runner
 /actions-runner
 /_work
@@ -61,4 +63,4 @@ app/yarn.lock
 /prisma/migrations
 
 # Tests
-/coverage
+/coverage

.husky/pre-commit

@@ -1,4 +1,4 @@
 #!/bin/sh
 . "$(dirname "$0")/_/husky.sh"
 
-npx pretty-quick --staged
+# npx pretty-quick --staged

CONTRIBUTING.md

@@ -25,7 +25,7 @@ Anyone can be a contributor. Either you found a typo, or you have an awesome fea
 
 A quick guide on how to setup _next-auth_ locally to work on it and test out any changes:
 
-The dev application requires you to use `npm@7`.
+The developer application requires you to use `npm@7`.
 
 1. Clone the repo:
 
@@ -34,7 +34,7 @@ git clone git@github.com:nextauthjs/next-auth.git
 cd next-auth
 ```
 
-2. Install packages, set up the dev application:
+2. Install packages and set up the developer application:
 
 ```sh
 npm run dev:setup
@@ -47,13 +47,13 @@ npm run dev:setup
 > NOTE: You can add any environment variables to .env.local that you would like to use in your dev app.
 > You can find the next-auth config under`app/pages/api/auth/[...nextauth].js`.
 
-1. Start the dev application/server:
+1. Start the developer application/server:
 
 ```sh
 npm run dev
 ```
 
-Your dev application will be available on `http://localhost:3000`
+Your developer application will be available on `http://localhost:3000`
 
 That's it! 🎉
 
@@ -61,9 +61,9 @@ If you need an example project to link to, you can use [next-auth-example](https
 
 #### Hot reloading
 
-When running `npm run dev`, you start a Next.js dev server on `http://localhost:3000`, which includes hot reloading out of the box. Make changes on any of the files in `src` and see the changes immediately.
+When running `npm run dev`, you start a Next.js developer server on `http://localhost:3000`, which includes hot reloading out of the box. Make changes on any of the files in `src` and see the changes immediately.
 
-> NOTE: When working on CSS, you will have to manually refresh the page after changes. The reason for this is our pages using CSS are server-side rendered. (Improving this through a PR is very welcome!)
+> NOTE: When working on CSS, you will have to manually refresh the page after changes. The reason for this is our pages using CSS are server-side rendered (using API routes). (Improving this through a PR is very welcome!)
 
 > NOTE: The setup is as follows: The development application lives inside the `app` folder, and whenever you make a change to the `src` folder in the root (where next-auth is), it gets copied into `app` every time (gitignored), so Next.js can pick them up and apply hot reloading. This is to avoid some annoying issues with how symlinks are working with different React builds, and also to provide a super-fast feedback loop while developing core features.
 

README.md

@@ -32,6 +32,11 @@ NextAuth.js is a complete open source authentication solution for [Next.js](http
 
 It is designed from the ground up to support Next.js and Serverless.
 
+This is the core repo for NextAuth.js. Check the repos below if you are interested in additional information:
+
+- Docs related: https://github.com/nextauthjs/docs
+- Adapter related: https://github.com/nextauthjs/adapters
+
 ## Getting Started
 
 ```
@@ -67,61 +72,64 @@ NextAuth.js can be used with or without a database.
 
 ### Secure by default
 
-- Promotes the use of passwordless sign in mechanisms
-- Designed to be secure by default and encourage best practice for safeguarding user data
-- Uses Cross Site Request Forgery Tokens on POST routes (sign in, sign out)
+- Promotes the use of passwordless sign-in mechanisms
+- Designed to be secure by default and encourage best practices for safeguarding user data
+- Uses Cross-Site Request Forgery (CSRF) Tokens on POST routes (sign in, sign out)
 - Default cookie policy aims for the most restrictive policy appropriate for each cookie
 - When JSON Web Tokens are enabled, they are signed by default (JWS) with HS512
 - Use JWT encryption (JWE) by setting the option `encryption: true` (defaults to A256GCM)
 - Auto-generates symmetric signing and encryption keys for developer convenience
-- Features tab/window syncing and keepalive messages to support short lived sessions
-- Attempts to implement the latest guidance published by [Open Web Application Security Project](https://owasp.org/)
+- Features tab/window syncing and session polling to support short lived sessions
+- Attempts to implement the latest guidance published by [Open Web Application Security Project](https://owasp.org)
 
 Advanced options allow you to define your own routines to handle controlling what accounts are allowed to sign in, for encoding and decoding JSON Web Tokens and to set custom cookie security policies and session properties, so you can control who is able to sign in and how often sessions have to be re-validated.
 
 ### TypeScript
 
-NextAuth.js comes with built-in types. For more information and usage, check out the [TypeScript section](https://next-auth.js.org/getting-started/typescript) in the documentation.
-
-The package at `@types/next-auth` is now deprecated.
+NextAuth.js comes with built-in types. For more information and usage, check out
+the [TypeScript section](https://next-auth.js.org/getting-started/typescript) in the documentation.
 
 ## Example
 
 ### Add API Route
 
 ```javascript
+// pages/api/auth/[...nextauth].js
 import NextAuth from "next-auth"
-import Providers from "next-auth/providers"
+import AppleProvider from "next-auth/providers/apple"
+import GoogleProvider from "next-auth/providers/google"
+import EmailProvider from "next-auth/providers/email"
 
 export default NextAuth({
+  secret: process.env.SECRET,
   providers: [
     // OAuth authentication providers
-    Providers.Apple({
+    AppleProvider({
       clientId: process.env.APPLE_ID,
       clientSecret: process.env.APPLE_SECRET,
     }),
-    Providers.Google({
+    GoogleProvider({
       clientId: process.env.GOOGLE_ID,
       clientSecret: process.env.GOOGLE_SECRET,
     }),
     // Sign in with passwordless email link
-    Providers.Email({
+    EmailProvider({
       server: process.env.MAIL_SERVER,
       from: "<no-reply@example.com>",
     }),
   ],
-  // SQL or MongoDB database (or leave empty)
-  database: process.env.DATABASE_URL,
 })
 ```
 
-### Add React Component
+### Add React Hook
+
+The `useSession()` React Hook in the NextAuth.js client is the easiest way to check if someone is signed in.
 
 ```javascript
-import { useSession, signIn, signOut } from "next-auth/client"
+import { useSession, signIn, signOut } from "next-auth/react"
 
 export default function Component() {
-  const [session, loading] = useSession()
+  const { data: session } = useSession()
   if (session) {
     return (
       <>
@@ -139,7 +147,26 @@ export default function Component() {
 }
 ```
 
-## Acknowledgements
+### Share/configure session state
+
+Use the `<SessionProvider>` to allows instances of `useSession()` to share the session object across components. It also takes care of keeping the session updated and synced between tabs/windows.
+
+```jsx title="pages/_app.js"
+import { SessionProvider } from "next-auth/react"
+
+export default function App({
+  Component, 
+  pageProps: { session, ...pageProps }
+}) {
+  return (
+    <SessionProvider session={session}>
+      <Component {...pageProps} />
+    </SessionProvider>
+  )
+}
+```
+
+## Acknowledgments
 
 [NextAuth.js is made possible thanks to all of its contributors.](https://next-auth.js.org/contributors)
 
@@ -172,6 +199,13 @@ We're happy to announce we've recently created an [OpenCollective](https://openc
         <div>Prisma</div><br />
         <sub>🥉 Bronze Financial Sponsor</sub>
       </td>
+      <td align="center" valign="top">
+        <a href="https://clerk.dev" target="_blank">
+          <img width="128px" src="https://avatars.githubusercontent.com/u/49538330?s=200&v=4" alt="Prisma Logo" />
+        </a><br />
+        <div>Clerk</div><br />
+        <sub>🥉 Bronze Financial Sponsor</sub>
+      </td>
       <td align="center" valign="top">
         <a href="https://checklyhq.com" target="_blank">
           <img width="128px" src="https://avatars.githubusercontent.com/u/25982255?v=4" alt="Checkly Logo" />
@@ -179,6 +213,13 @@ We're happy to announce we've recently created an [OpenCollective](https://openc
         <div>Checkly</div><br />
         <sub>☁️ Infrastructure Support</sub>
       </td>
+      <td align="center" valign="top">
+        <a href="https://superblog.ai/" target="_blank">
+          <img width="128px" src="https://d33wubrfki0l68.cloudfront.net/cdc4a3833bd878933fcc131655878dbf226ac1c5/10cd6/images/logo_bolt_small.png" alt="superblog Logo" />
+        </a><br />
+        <div>superblog</div><br />
+        <sub>☁️ Infrastructure Support</sub>
+      </td>
     </tr><tr></tr>
   </tbody>
 </table>
@@ -187,7 +228,8 @@ We're happy to announce we've recently created an [OpenCollective](https://openc
 
 ## Contributing
 
-We're open to all community contributions! If you'd like to contribute in any way, please first read our [Contributing Guide](https://github.com/nextauthjs/next-auth/blob/canary/CONTRIBUTING.md).
+We're open to all community contributions! If you'd like to contribute in any way, please first read
+our [Contributing Guide](https://github.com/nextauthjs/next-auth/blob/canary/CONTRIBUTING.md).
 
 ## License
 

SECURITY.md

@@ -2,12 +2,6 @@
 
 NextAuth.js practices responsible disclosure.
 
-## Supported Versions
-
-Security updates are only released for the current version.
-
-Old releases are not maintained and do not receive updates.
-
 ## Reporting a Vulnerability
 
 We request that you contact us directly to report serious issues that might impact the security of sites using NextAuth.js.
@@ -19,6 +13,12 @@ If you contact us regarding a serious issue:
 - We will disclose the issue (and credit you, with your consent) once a fix to resolve the issue has been released.
 - If 90 days has elapsed and we still don't have a fix, we will disclose the issue publicly.
 
-Currently, the best way to report an issue is by contacting us via email at me@iaincollins.com or info@balazsorban.com and yo@ndo.dev.
+The best way to report an issue is by contacting us via email at info@balazsorban.com or me@iaincollins.com and yo@ndo.dev, or raise a public issue requesting someone get in touch with you via whatever means you prefer for more details. (Please do not disclose sensitive details publicly at this stage.)
 
-For less serious issues (e.g. RFC compliance for unsupported flows or potential issues that may cause a problem future or default behaviour / options) it is appropriate to submit these these publically as bug reports or feature requests or to raise a question to open a discussion around them.
+> For less serious issues (e.g. RFC compliance for unsupported flows or potential issues that may cause a problem in the future) it is appropriate to submit these these publically as bug reports or feature requests or to raise a question to open a discussion around them.
+
+## Supported Versions
+
+Security updates are only released for the current version.
+
+Old releases are not maintained and do not receive updates.

app/.env.local.example

@@ -6,19 +6,33 @@ NEXTAUTH_URL=http://localhost:3000
 # You can use `openssl rand -hex 32` or 
 # https://generate-secret.vercel.app/32 to generate a secret.
 # Note: Changing a secret may invalidate existing sessions
-# and/or verificaion tokens.
-SECRET= 
+# and/or verification tokens.
+SECRET=secret
 
 AUTH0_ID=
-AUTH0_DOMAIN=
 AUTH0_SECRET=
+AUTH0_ISSUER=
+
+KEYCLOAK_ID=
+KEYCLOAK_SECRET=
+KEYCLOAK_ISSUER=
+
+IDS4_ID=
+IDS4_SECRET=
+IDS4_ISSUER=
 
 GITHUB_ID=
 GITHUB_SECRET=
 
+TWITCH_ID=
+TWITCH_SECRET=
+
 TWITTER_ID=
 TWITTER_SECRET=
 
+LINE_ID=
+LINE_SECRET=
+
 # Example configuration for a Gmail account (will need SMTP enabled)
 EMAIL_SERVER=smtps://user@gmail.com:password@smtp.gmail.com:465
 EMAIL_FROM=user@gmail.com
@@ -28,4 +42,4 @@ EMAIL_FROM=user@gmail.com
 # Postgres: DATABASE_URL=postgres://nextauth:password@127.0.0.1:5432/nextauth?synchronize=true
 # MySQL:    DATABASE_URL=mysql://nextauth:password@127.0.0.1:3306/nextauth?synchronize=true
 # MongoDB:  DATABASE_URL=mongodb://nextauth:password@127.0.0.1:27017/nextauth?synchronize=true
-DATABASE_URL=
+DATABASE_URL=

app/.nvmrc

@@ -0,0 +1 @@
+16

app/components/access-denied.js

@@ -1,17 +1,18 @@
-import { signIn } from 'next-auth/client'
+import { signIn } from "next-auth/react"
 
-export default function AccessDenied () {
+export default function AccessDenied() {
   return (
     <>
       <h1>Access Denied</h1>
       <p>
         <a
-          href='/api/auth/signin'
+          href="/api/auth/signin"
           onClick={(e) => {
             e.preventDefault()
             signIn()
           }}
-        >You must be signed in to view this page
+        >
+          You must be signed in to view this page
         </a>
       </p>
     </>

app/components/header.js

@@ -1,22 +1,22 @@
-import Link from 'next/link'
-import { signIn, signOut, useSession } from 'next-auth/client'
-import styles from './header.module.css'
+import Link from "next/link"
+import { signIn, signOut, useSession } from "next-auth/react"
+import styles from "./header.module.css"
 
 // The approach used in this component shows how to built a sign in and sign out
 // component that works on pages which support both client and server side
 // rendering, and avoids any flash incorrect content on initial page load.
-export default function Header () {
-  const [session, loading] = useSession()
+export default function Header() {
+  const { data: session, status } = useSession()
 
   return (
     <header>
       <noscript>
-        <style>{'.nojs-show { opacity: 1; top: 0; }'}</style>
+        <style>{".nojs-show { opacity: 1; top: 0; }"}</style>
       </noscript>
       <div className={styles.signedInStatus}>
         <p
           className={`nojs-show ${
-            !session && loading ? styles.loading : styles.loaded
+            !session && status === "loading" ? styles.loading : styles.loaded
           }`}
         >
           {!session && (
@@ -25,7 +25,7 @@ export default function Header () {
                 You are not signed in
               </span>
               <a
-                href='/api/auth/signin'
+                href="/api/auth/signin"
                 className={styles.buttonPrimary}
                 onClick={(e) => {
                   e.preventDefault()
@@ -39,18 +39,16 @@ export default function Header () {
           {session && (
             <>
               {session.user.image && (
-                <span
-                  style={{ backgroundImage: `url(${session.user.image})` }}
-                  className={styles.avatar}
-                />
+                <img src={session.user.image} className={styles.avatar} />
               )}
               <span className={styles.signedInText}>
                 <small>Signed in as</small>
                 <br />
-                <strong>{session.user.email || session.user.name}</strong>
+                <strong>{session.user.email} </strong>
+                {session.user.name ? `(${session.user.name})` : null}
               </span>
               <a
-                href='/api/auth/signout'
+                href="/api/auth/signout"
                 className={styles.button}
                 onClick={(e) => {
                   e.preventDefault()
@@ -66,42 +64,42 @@ export default function Header () {
       <nav>
         <ul className={styles.navItems}>
           <li className={styles.navItem}>
-            <Link href='/'>
+            <Link href="/">
               <a>Home</a>
             </Link>
           </li>
           <li className={styles.navItem}>
-            <Link href='/client'>
+            <Link href="/client">
               <a>Client</a>
             </Link>
           </li>
           <li className={styles.navItem}>
-            <Link href='/server'>
+            <Link href="/server">
               <a>Server</a>
             </Link>
           </li>
           <li className={styles.navItem}>
-            <Link href='/protected'>
+            <Link href="/protected">
               <a>Protected</a>
             </Link>
           </li>
           <li className={styles.navItem}>
-            <Link href='/protected-ssr'>
+            <Link href="/protected-ssr">
               <a>Protected(SSR)</a>
             </Link>
           </li>
           <li className={styles.navItem}>
-            <Link href='/api-example'>
+            <Link href="/api-example">
               <a>API</a>
             </Link>
           </li>
           <li className={styles.navItem}>
-            <Link href='/credentials'>
+            <Link href="/credentials">
               <a>Credentials</a>
             </Link>
           </li>
           <li className={styles.navItem}>
-            <Link href='/email'>
+            <Link href="/email">
               <a>Email</a>
             </Link>
           </li>

app/jsconfig.json

@@ -1,5 +0,0 @@
-{
-  "compilerOptions": {
-    "baseUrl": "."
-  }
-}

app/next-env.d.ts

@@ -1,2 +1,6 @@
 /// <reference types="next" />
 /// <reference types="next/types/global" />
+/// <reference types="next/image-types/global" />
+
+// NOTE: This file should not be edited
+// see https://nextjs.org/docs/basic-features/typescript for more information.

app/next.config.js

@@ -2,18 +2,29 @@ const path = require("path")
 
 module.exports = {
   webpack(config) {
+    config.experiments = {
+      topLevelAwait: true,
+    }
     config.resolve = {
       ...config.resolve,
       alias: {
         ...config.resolve.alias,
-        "next-auth$": path.join(process.cwd(), "next-auth/server"),
-        "next-auth/client$": path.join(process.cwd(), "next-auth/client"),
-        "next-auth/jwt$": path.join(process.cwd(), "next-auth/lib/jwt"),
-        "next-auth/adapters": path.join(process.cwd(), "next-auth/adapters"),
-        "next-auth/providers": path.join(process.cwd(), "next-auth/providers"),
+        react: path.join(process.cwd(), "node_modules/react"),
+        nodemailer: path.join(process.cwd(), "node_modules/nodemailer"),
+        "react-dom": path.join(process.cwd(), "node_modules/react-dom"),
+        "react/jsx-dev-runtime": path.join(
+          process.cwd(),
+          "node_modules/react/jsx-dev-runtime"
+        ),
       },
     }
 
     return config
   },
+  typescript: {
+    ignoreBuildErrors: true,
+  },
+  experimental: {
+    externalDir: true,
+  },
 }

app/package.json

@@ -4,22 +4,31 @@
   "description": "NextAuth.js Developer app",
   "private": true,
   "scripts": {
-    "dev": "npm-run-all --parallel copy:app dev:css dev:next",
+    "clean": "rm -rf .next",
+    "dev": "npm-run-all --parallel dev:next watch:css copy:css ",
     "dev:next": "next dev",
-    "copy:app": "cpx \"../src/**/*\" next-auth --watch",
-    "copy:css": "cpx \"../dist/css/**/*\" dist/css --watch",
+    "build": "next build",
+    "copy:css": "cpx \"../css/**/*\" src/css --watch",
     "watch:css": "cd .. && npm run watch:css",
-    "dev:css": "npm-run-all --parallel watch:css copy:css",
-    "start": "next start"
+    "start": "next start",
+    "email": "npx fake-smtp-server",
+    "start:email": "email"
   },
   "license": "ISC",
   "dependencies": {
-    "next": "^11.0.1",
+    "@next-auth/fauna-adapter": "0.2.2-next.4",
+    "@next-auth/prisma-adapter": "0.5.2-next.5",
+    "@prisma/client": "^2.29.1",
+    "fake-smtp-server": "^0.8.0",
+    "faunadb": "^4.3.0",
+    "next": "^11.1.0",
+    "nodemailer": "^6.6.3",
     "react": "^17.0.2",
     "react-dom": "^17.0.2"
   },
   "devDependencies": {
     "cpx": "^1.5.0",
-    "npm-run-all": "^4.1.5"
+    "npm-run-all": "^4.1.5",
+    "prisma": "^2.29.1"
   }
 }

app/pages/_app.js

@@ -1,31 +1,10 @@
-import { Provider } from "next-auth/client"
+import { SessionProvider } from "next-auth/react"
 import "./styles.css"
 
-// Use the <Provider> to improve performance and allow components that call
-// `useSession()` anywhere in your application to access the `session` object.
 export default function App({ Component, pageProps }) {
   return (
-    <Provider
-      // Provider options are not required but can be useful in situations where
-      // you have a short session maxAge time. Shown here with default values.
-      options={{
-        // Client Max Age controls how often the useSession in the client should
-        // contact the server to sync the session state. Value in seconds.
-        // e.g.
-        // * 0  - Disabled (always use cache value)
-        // * 60 - Sync session state with server if it's older than 60 seconds
-        clientMaxAge: 0,
-        // Keep Alive tells windows / tabs that are signed in to keep sending
-        // a keep alive request (which extends the current session expiry) to
-        // prevent sessions in open windows from expiring. Value in seconds.
-        //
-        // Note: If a session has expired when keep alive is triggered, all open
-        // windows / tabs will be updated to reflect the user is signed out.
-        keepAlive: 0,
-      }}
-      session={pageProps.session}
-    >
+    <SessionProvider session={pageProps.session}>
       <Component {...pageProps} />
-    </Provider>
+    </SessionProvider>
   )
 }

app/pages/api/auth/[...nextauth].js

@@ -1,91 +0,0 @@
-import NextAuth from "next-auth"
-import EmailProvider from "next-auth/providers/email"
-import GitHubProvider from "next-auth/providers/github"
-import Auth0Provider from "next-auth/providers/auth0"
-import TwitterProvider from "next-auth/providers/twitter"
-import CredentialsProvider from "next-auth/providers/credentials"
-
-// import Adapters from 'next-auth/adapters'
-// import { PrismaClient } from '@prisma/client'
-// const prisma = new PrismaClient()
-
-export default NextAuth({
-  // Used to debug https://github.com/nextauthjs/next-auth/issues/1664
-  // cookies: {
-  //   csrfToken: {
-  //     name: 'next-auth.csrf-token',
-  //     options: {
-  //       httpOnly: true,
-  //       sameSite: 'none',
-  //       path: '/',
-  //       secure: true
-  //     }
-  //   },
-  //   pkceCodeVerifier: {
-  //     name: 'next-auth.pkce.code_verifier',
-  //     options: {
-  //       httpOnly: true,
-  //       sameSite: 'none',
-  //       path: '/',
-  //       secure: true
-  //     }
-  //   }
-  // },
-  providers: [
-    EmailProvider({
-      server: process.env.EMAIL_SERVER,
-      from: process.env.EMAIL_FROM,
-    }),
-    GitHubProvider({
-      clientId: process.env.GITHUB_ID,
-      clientSecret: process.env.GITHUB_SECRET,
-    }),
-    Auth0Provider({
-      clientId: process.env.AUTH0_ID,
-      clientSecret: process.env.AUTH0_SECRET,
-      domain: process.env.AUTH0_DOMAIN,
-      // Used to debug https://github.com/nextauthjs/next-auth/issues/1664
-      // protection: ["pkce", "state"],
-      // authorizationParams: {
-      //   response_mode: 'form_post'
-      // }
-      protection: "pkce",
-    }),
-    TwitterProvider({
-      clientId: process.env.TWITTER_ID,
-      clientSecret: process.env.TWITTER_SECRET,
-    }),
-    CredentialsProvider({
-      name: "Credentials",
-      credentials: {
-        password: { label: "Password", type: "password" },
-      },
-      async authorize(credentials, req) {
-        if (credentials.password === "password") {
-          return {
-            id: 1,
-            name: "Fill Murray",
-            email: "bill@fillmurray.com",
-            image: "https://www.fillmurray.com/64/64",
-          }
-        }
-        return null
-      },
-    }),
-  ],
-  jwt: {
-    encryption: true,
-    secret: process.env.SECRET,
-  },
-  debug: false,
-  theme: "auto",
-
-  // Default Database Adapter (TypeORM)
-  // database: process.env.DATABASE_URL
-
-  // Prisma Database Adapter
-  // To configure this app to use the schema in `prisma/schema.prisma` run:
-  // npx prisma generate
-  // npx prisma migrate dev
-  // adapter: Adapters.Prisma.Adapter({ prisma })
-})

app/pages/api/auth/[...nextauth].ts

@@ -0,0 +1,190 @@
+import NextAuth, { NextAuthOptions } from "next-auth"
+import EmailProvider from "next-auth/providers/email"
+import GitHubProvider from "next-auth/providers/github"
+import Auth0Provider from "next-auth/providers/auth0"
+import KeycloakProvider from "next-auth/providers/keycloak"
+import TwitterProvider from "next-auth/providers/twitter"
+import CredentialsProvider from "next-auth/providers/credentials"
+import IDS4Provider from "next-auth/providers/identity-server4"
+import Twitch from "next-auth/providers/twitch"
+import GoogleProvider from "next-auth/providers/google"
+import FacebookProvider from "next-auth/providers/facebook"
+import FoursquareProvider from "next-auth/providers/foursquare"
+// import FreshbooksProvider from "next-auth/providers/freshbooks"
+import GitlabProvider from "next-auth/providers/gitlab"
+import InstagramProvider from "next-auth/providers/instagram"
+import LineProvider from "next-auth/providers/line"
+import LinkedInProvider from "next-auth/providers/linkedin"
+import MailchimpProvider from "next-auth/providers/mailchimp"
+import DiscordProvider from "next-auth/providers/discord"
+import AzureADProvider from "next-auth/providers/azure-ad"
+import SpotifyProvider from "next-auth/providers/spotify"
+import CognitoProvider from "next-auth/providers/cognito"
+import SlackProvider from "next-auth/providers/slack"
+import Okta from "next-auth/providers/okta"
+import AzureB2C from "next-auth/providers/azure-ad-b2c"
+import OsuProvider from "next-auth/providers/osu"
+import AppleProvider from "next-auth/providers/apple"
+
+// import { PrismaAdapter } from "@next-auth/prisma-adapter"
+// import { PrismaClient } from "@prisma/client"
+// const prisma = new PrismaClient()
+// const adapter = PrismaAdapter(prisma)
+
+// import { Client as FaunaClient } from "faunadb"
+// import { FaunaAdapter } from "@next-auth/fauna-adapter"
+
+// const client = new FaunaClient({
+//   secret: process.env.FAUNA_SECRET,
+//   domain: process.env.FAUNA_DOMAIN,
+// })
+// const adapter = FaunaAdapter(client)
+export const authOptions: NextAuthOptions = {
+  // adapter,
+  providers: [
+    // E-mail
+    // Start fake e-mail server with `npm run start:email`
+    // EmailProvider({
+    //   server: {
+    //     host: "127.0.0.1",
+    //     auth: null,
+    //     secure: false,
+    //     port: 1025,
+    //     tls: { rejectUnauthorized: false },
+    //   },
+    // }),
+    // Credentials
+    CredentialsProvider({
+      name: "Credentials",
+      credentials: {
+        password: { label: "Password", type: "password" },
+      },
+      async authorize(credentials) {
+        if (credentials.password === "pw") {
+          return {
+            name: "Fill Murray",
+            email: "bill@fillmurray.com",
+            image: "https://www.fillmurray.com/64/64",
+          }
+        }
+        return null
+      },
+    }),
+    // OAuth 1
+    TwitterProvider({
+      clientId: process.env.TWITTER_ID,
+      clientSecret: process.env.TWITTER_SECRET,
+    }),
+    // OAuth 2 / OIDC
+    GitHubProvider({
+      clientId: process.env.GITHUB_ID,
+      clientSecret: process.env.GITHUB_SECRET,
+    }),
+    Auth0Provider({
+      clientId: process.env.AUTH0_ID,
+      clientSecret: process.env.AUTH0_SECRET,
+      issuer: process.env.AUTH0_ISSUER,
+    }),
+    KeycloakProvider({
+      clientId: process.env.KEYCLOAK_ID,
+      clientSecret: process.env.KEYCLOAK_SECRET,
+      issuer: process.env.KEYCLOAK_ISSUER,
+    }),
+    Twitch({
+      clientId: process.env.TWITCH_ID,
+      clientSecret: process.env.TWITCH_SECRET,
+    }),
+    GoogleProvider({
+      clientId: process.env.GOOGLE_ID,
+      clientSecret: process.env.GOOGLE_SECRET,
+    }),
+    FacebookProvider({
+      clientId: process.env.FACEBOOK_ID,
+      clientSecret: process.env.FACEBOOK_SECRET,
+    }),
+    FoursquareProvider({
+      clientId: process.env.FOURSQUARE_ID,
+      clientSecret: process.env.FOURSQUARE_SECRET,
+    }),
+    // FreshbooksProvider({
+    //   clientId: process.env.FRESHBOOKS_ID,
+    //   clientSecret: process.env.FRESHBOOKS_SECRET,
+    // }),
+    GitlabProvider({
+      clientId: process.env.GITLAB_ID,
+      clientSecret: process.env.GITLAB_SECRET,
+    }),
+    InstagramProvider({
+      clientId: process.env.INSTAGRAM_ID,
+      clientSecret: process.env.INSTAGRAM_SECRET,
+    }),
+    LineProvider({
+      clientId: process.env.LINE_ID,
+      clientSecret: process.env.LINE_SECRET,
+    }),
+    LinkedInProvider({
+      clientId: process.env.LINKEDIN_ID,
+      clientSecret: process.env.LINKEDIN_SECRET,
+    }),
+    MailchimpProvider({
+      clientId: process.env.MAILCHIMP_ID,
+      clientSecret: process.env.MAILCHIMP_SECRET,
+    }),
+    IDS4Provider({
+      clientId: process.env.IDS4_ID,
+      clientSecret: process.env.IDS4_SECRET,
+      issuer: process.env.IDS4_ISSUER,
+    }),
+    DiscordProvider({
+      clientId: process.env.DISCORD_ID,
+      clientSecret: process.env.DISCORD_SECRET,
+    }),
+    AzureADProvider({
+      clientId: process.env.AZURE_AD_CLIENT_ID,
+      clientSecret: process.env.AZURE_AD_CLIENT_SECRET,
+      tenantId: process.env.AZURE_AD_TENANT_ID,
+      profilePhotoSize: 48,
+    }),
+    SpotifyProvider({
+      clientId: process.env.SPOTIFY_ID,
+      clientSecret: process.env.SPOTIFY_SECRET,
+    }),
+    CognitoProvider({
+      clientId: process.env.COGNITO_ID,
+      clientSecret: process.env.COGNITO_SECRET,
+      issuer: process.env.COGNITO_ISSUER,
+    }),
+    Okta({
+      clientId: process.env.OKTA_ID,
+      clientSecret: process.env.OKTA_SECRET,
+      issuer: process.env.OKTA_ISSUER,
+    }),
+    SlackProvider({
+      clientId: process.env.SLACK_ID,
+      clientSecret: process.env.SLACK_SECRET,
+    }),
+    AzureB2C({
+      clientId: process.env.AZURE_B2C_ID,
+      clientSecret: process.env.AZURE_B2C_SECRET,
+      tenantId: process.env.AZURE_B2C_TENANT_ID,
+      primaryUserFlow: process.env.AZURE_B2C_PRIMARY_USER_FLOW,
+    }),
+    OsuProvider({
+      clientId: process.env.OSU_CLIENT_ID,
+      clientSecret: process.env.OSU_CLIENT_SECRET,
+    }),
+    AppleProvider({
+      clientId: process.env.APPLE_ID,
+      clientSecret: process.env.APPLE_SECRET,
+    }),
+  ],
+  secret: process.env.SECRET,
+  debug: true,
+  theme: {
+    colorScheme: "auto",
+    logo: "https://next-auth.js.org/img/logo/logo-sm.png",
+    brandColor: "#1786fb",
+  },
+}
+
+export default NextAuth(authOptions)

app/pages/api/examples/jwt.js

@@ -1,9 +1,7 @@
 // This is an example of how to read a JSON Web Token from an API route
-import jwt from 'next-auth/jwt'
-
-const secret = process.env.SECRET
+import { getToken } from "next-auth/jwt"
 
 export default async (req, res) => {
-  const token = await jwt.getToken({ req, secret, encryption: true })
+  const token = await getToken({ req, secret: process.env.SECRET })
   res.send(JSON.stringify(token, null, 2))
 }

app/pages/api/examples/protected.js

@@ -1,12 +1,17 @@
 // This is an example of to protect an API route
-import { getSession } from 'next-auth/client'
+import { getSession } from "next-auth/react"
 
 export default async (req, res) => {
   const session = await getSession({ req })
 
   if (session) {
-    res.send({ content: 'This is protected content. You can access this content because you are signed in.' })
+    res.send({
+      content:
+        "This is protected content. You can access this content because you are signed in.",
+    })
   } else {
-    res.send({ error: 'You must be sign in to view the protected content on this page.' })
+    res.send({
+      error: "You must be sign in to view the protected content on this page.",
+    })
   }
 }

app/pages/api/examples/session.js

@@ -1,5 +1,5 @@
 // This is an example of how to access a session from an API route
-import { getSession } from 'next-auth/client'
+import { getSession } from "next-auth/react"
 
 export default async (req, res) => {
   const session = await getSession({ req })

app/pages/credentials.js

@@ -1,15 +1,15 @@
 // eslint-disable-next-line no-use-before-define
-import * as React from 'react'
-import { signIn, signOut, useSession } from 'next-auth/client'
-import Layout from 'components/layout'
+import * as React from "react"
+import { signIn, signOut, useSession } from "next-auth/react"
+import Layout from "components/layout"
 
-export default function Page () {
+export default function Page() {
   const [response, setResponse] = React.useState(null)
   const handleLogin = (options) => async () => {
     if (options.redirect) {
-      return signIn('credentials', options)
+      return signIn("credentials", options)
     }
-    const response = await signIn('credentials', options)
+    const response = await signIn("credentials", options)
     setResponse(response)
   }
 
@@ -21,18 +21,22 @@ export default function Page () {
     setResponse(response)
   }
 
-  const [session] = useSession()
+  const { data: session } = useSession()
 
   if (session) {
     return (
       <Layout>
         <h1>Test different flows for Credentials logout</h1>
-        <span className='spacing'>Default:</span>
-        <button onClick={handleLogout({ redirect: true })}>Logout</button><br />
-        <span className='spacing'>No redirect:</span>
-        <button onClick={handleLogout({ redirect: false })}>Logout</button><br />
+        <span className="spacing">Default:</span>
+        <button onClick={handleLogout({ redirect: true })}>Logout</button>
+        <br />
+        <span className="spacing">No redirect:</span>
+        <button onClick={handleLogout({ redirect: false })}>Logout</button>
+        <br />
         <p>Response:</p>
-        <pre style={{ background: '#eee', padding: 16 }}>{JSON.stringify(response, null, 2)}</pre>
+        <pre style={{ background: "#eee", padding: 16 }}>
+          {JSON.stringify(response, null, 2)}
+        </pre>
       </Layout>
     )
   }
@@ -40,14 +44,24 @@ export default function Page () {
   return (
     <Layout>
       <h1>Test different flows for Credentials login</h1>
-      <span className='spacing'>Default:</span>
-      <button onClick={handleLogin({ redirect: true, password: 'password' })}>Login</button><br />
-      <span className='spacing'>No redirect:</span>
-      <button onClick={handleLogin({ redirect: false, password: 'password' })}>Login</button><br />
-      <span className='spacing'>No redirect, wrong password:</span>
-      <button onClick={handleLogin({ redirect: false, password: '' })}>Login</button>
+      <span className="spacing">Default:</span>
+      <button onClick={handleLogin({ redirect: true, password: "password" })}>
+        Login
+      </button>
+      <br />
+      <span className="spacing">No redirect:</span>
+      <button onClick={handleLogin({ redirect: false, password: "password" })}>
+        Login
+      </button>
+      <br />
+      <span className="spacing">No redirect, wrong password:</span>
+      <button onClick={handleLogin({ redirect: false, password: "" })}>
+        Login
+      </button>
       <p>Response:</p>
-      <pre style={{ background: '#eee', padding: 16 }}>{JSON.stringify(response, null, 2)}</pre>
+      <pre style={{ background: "#eee", padding: 16 }}>
+        {JSON.stringify(response, null, 2)}
+      </pre>
     </Layout>
   )
 }

app/pages/email.js

@@ -1,11 +1,11 @@
 // eslint-disable-next-line no-use-before-define
-import * as React from 'react'
-import { signIn, signOut, useSession } from 'next-auth/client'
-import Layout from 'components/layout'
+import * as React from "react"
+import { signIn, signOut, useSession } from "next-auth/react"
+import Layout from "components/layout"
 
-export default function Page () {
+export default function Page() {
   const [response, setResponse] = React.useState(null)
-  const [email, setEmail] = React.useState('')
+  const [email, setEmail] = React.useState("")
 
   const handleChange = (event) => {
     setEmail(event.target.value)
@@ -15,9 +15,9 @@ export default function Page () {
     event.preventDefault()
 
     if (options.redirect) {
-      return signIn('email', options)
+      return signIn("email", options)
     }
-    const response = await signIn('email', options)
+    const response = await signIn("email", options)
     setResponse(response)
   }
 
@@ -29,18 +29,22 @@ export default function Page () {
     setResponse(response)
   }
 
-  const [session] = useSession()
+  const { data: session } = useSession()
 
   if (session) {
     return (
       <Layout>
         <h1>Test different flows for Email logout</h1>
-        <span className='spacing'>Default:</span>
-        <button onClick={handleLogout({ redirect: true })}>Logout</button><br />
-        <span className='spacing'>No redirect:</span>
-        <button onClick={handleLogout({ redirect: false })}>Logout</button><br />
+        <span className="spacing">Default:</span>
+        <button onClick={handleLogout({ redirect: true })}>Logout</button>
+        <br />
+        <span className="spacing">No redirect:</span>
+        <button onClick={handleLogout({ redirect: false })}>Logout</button>
+        <br />
         <p>Response:</p>
-        <pre style={{ background: '#eee', padding: 16 }}>{JSON.stringify(response, null, 2)}</pre>
+        <pre style={{ background: "#eee", padding: 16 }}>
+          {JSON.stringify(response, null, 2)}
+        </pre>
       </Layout>
     )
   }
@@ -48,20 +52,29 @@ export default function Page () {
   return (
     <Layout>
       <h1>Test different flows for Email login</h1>
-      <label className='spacing'>
-        Email address:{' '}
-        <input type='text' id='email' name='email' value={email} onChange={handleChange} />
-      </label><br />
+      <label className="spacing">
+        Email address:{" "}
+        <input
+          type="text"
+          id="email"
+          name="email"
+          value={email}
+          onChange={handleChange}
+        />
+      </label>
+      <br />
       <form onSubmit={handleLogin({ redirect: true, email })}>
-        <span className='spacing'>Default:</span>
-        <button type='submit'>Sign in with Email</button>
+        <span className="spacing">Default:</span>
+        <button type="submit">Sign in with Email</button>
       </form>
       <form onSubmit={handleLogin({ redirect: false, email })}>
-        <span className='spacing'>No redirect:</span>
-        <button type='submit'>Sign in with Email</button>
+        <span className="spacing">No redirect:</span>
+        <button type="submit">Sign in with Email</button>
       </form>
       <p>Response:</p>
-      <pre style={{ background: '#eee', padding: 16 }}>{JSON.stringify(response, null, 2)}</pre>
+      <pre style={{ background: "#eee", padding: 16 }}>
+        {JSON.stringify(response, null, 2)}
+      </pre>
     </Layout>
   )
 }

app/pages/protected-ssr.js

@@ -1,37 +1,48 @@
 // This is an example of how to protect content using server rendering
-import { getSession } from 'next-auth/client'
-import Layout from '../components/layout'
-import AccessDenied from '../components/access-denied'
+import { getServerSession } from "next-auth/next"
+import { authOptions } from "./api/auth/[...nextauth]"
+import Layout from "../components/layout"
+import AccessDenied from "../components/access-denied"
 
-export default function Page ({ content, session }) {
+export default function Page({ content, session }) {
   // If no session exists, display access denied message
-  if (!session) { return <Layout><AccessDenied /></Layout> }
+  if (!session) {
+    return (
+      <Layout>
+        <AccessDenied />
+      </Layout>
+    )
+  }
 
   // If session exists, display content
   return (
     <Layout>
       <h1>Protected Page</h1>
-      <p><strong>{content}</strong></p>
+      <p>
+        <strong>{content}</strong>
+      </p>
     </Layout>
   )
 }
 
-export async function getServerSideProps (context) {
-  const session = await getSession(context)
+export async function getServerSideProps(context) {
+  const session = await getServerSession(context, authOptions)
   let content = null
 
   if (session) {
-    const hostname = process.env.NEXTAUTH_URL || 'http://localhost:3000'
+    const hostname = process.env.NEXTAUTH_URL || "http://localhost:3000"
     const options = { headers: { cookie: context.req.headers.cookie } }
     const res = await fetch(`${hostname}/api/examples/protected`, options)
     const json = await res.json()
-    if (json.content) { content = json.content }
+    if (json.content) {
+      content = json.content
+    }
   }
 
   return {
     props: {
       session,
-      content
-    }
+      content,
+    },
   }
 }

app/pages/protected.js

@@ -1,33 +1,35 @@
-import { useState, useEffect } from 'react'
-import { useSession } from 'next-auth/client'
-import Layout from '../components/layout'
-import AccessDenied from '../components/access-denied'
+import { useState, useEffect } from "react"
+import { useSession } from "next-auth/react"
+import Layout from "../components/layout"
 
-export default function Page () {
-  const [session, loading] = useSession()
+export default function Page() {
+  const { status } = useSession({
+    required: true,
+  })
   const [content, setContent] = useState()
 
   // Fetch content from protected route
   useEffect(() => {
+    if (status === "loading") return
     const fetchData = async () => {
-      const res = await fetch('/api/examples/protected')
+      const res = await fetch("/api/examples/protected")
       const json = await res.json()
-      if (json.content) { setContent(json.content) }
+      if (json.content) {
+        setContent(json.content)
+      }
     }
     fetchData()
-  }, [session])
+  }, [status])
 
-  // When rendering client side don't display anything until loading is complete
-  if (typeof window !== 'undefined' && loading) return null
-
-  // If no session exists, display access denied message
-  if (!session) { return <Layout><AccessDenied /></Layout> }
+  if (status === "loading") return <Layout>Loading...</Layout>
 
   // If session exists, display content
   return (
     <Layout>
       <h1>Protected Page</h1>
-      <p><strong>{content}</strong></p>
+      <p>
+        <strong>{content}</strong>
+      </p>
     </Layout>
   )
 }

app/pages/server.js

@@ -1,7 +1,7 @@
-import { getSession } from 'next-auth/client'
-import Layout from '../components/layout'
+import { getSession } from "next-auth/react"
+import Layout from "../components/layout"
 
-export default function Page () {
+export default function Page() {
   // As this page uses Server Side Rendering, the `session` will be already
   // populated on render without needing to go through a loading stage.
   // This is possible because of the shared context configured in `_app.js` that
@@ -11,27 +11,31 @@ export default function Page () {
     <Layout>
       <h1>Server Side Rendering</h1>
       <p>
-        This page uses the universal <strong>getSession()</strong> method in <strong>getServerSideProps()</strong>.
+        This page uses the universal <strong>getSession()</strong> method in{" "}
+        <strong>getServerSideProps()</strong>.
       </p>
       <p>
-        Using <strong>getSession()</strong> in <strong>getServerSideProps()</strong> is the recommended approach if you need to
-        support Server Side Rendering with authentication.
+        Using <strong>getSession()</strong> in{" "}
+        <strong>getServerSideProps()</strong> is the recommended approach if you
+        need to support Server Side Rendering with authentication.
       </p>
       <p>
-        The advantage of Server Side Rendering is this page does not require client side JavaScript.
+        The advantage of Server Side Rendering is this page does not require
+        client side JavaScript.
       </p>
       <p>
-        The disadvantage of Server Side Rendering is that this page is slower to render.
+        The disadvantage of Server Side Rendering is that this page is slower to
+        render.
       </p>
     </Layout>
   )
 }
 
 // Export the `session` prop to use sessions with Server Side Rendering
-export async function getServerSideProps (context) {
+export async function getServerSideProps(context) {
   return {
     props: {
-      session: await getSession(context)
-    }
+      session: await getSession(context),
+    },
   }
 }

app/pages/styles.css

@@ -4,7 +4,7 @@ body {
   max-width: 680px;
   margin: 0 auto;
   background: #fff;
-  color: #333;
+  color: var(--color-text);
 }
 
 li,

app/prisma/schema.prisma

@@ -1,63 +1,57 @@
+datasource db {
+  provider = "sqlite"
+  url      = "file:./dev.db"
+}
+
 generator client {
   provider = "prisma-client-js"
 }
 
-datasource db {
-  provider = "postgresql"
-  url      = env("DATABASE_URL")
-}
-
 model Account {
-  id                 Int       @default(autoincrement()) @id
-  compoundId         String    @unique @map(name: "compound_id")
-  userId             Int       @map(name: "user_id")
-  providerType       String    @map(name: "provider_type")
-  providerId         String    @map(name: "provider_id")
-  providerAccountId  String    @map(name: "provider_account_id")
-  refreshToken       String?   @map(name: "refresh_token")
-  accessToken        String?   @map(name: "access_token")
-  accessTokenExpires DateTime? @map(name: "access_token_expires")
-  createdAt          DateTime  @default(now()) @map(name: "created_at")
-  updatedAt          DateTime  @default(now()) @map(name: "updated_at")
+  id                 String  @id @default(cuid())
+  userId             String
+  type               String
+  provider           String
+  providerAccountId  String
+  refresh_token      String?
+  access_token       String?
+  expires_at         Int?
+  token_type         String?
+  scope              String?
+  id_token           String?
+  session_state      String?
+  oauth_token_secret String?
+  oauth_token        String?
 
-  @@index([providerAccountId], name: "providerAccountId")
-  @@index([providerId], name: "providerId")
-  @@index([userId], name: "userId")
+  createdAt DateTime @default(now())
+  updatedAt DateTime @updatedAt
+  user      User     @relation(fields: [userId], references: [id])
 
-  @@map(name: "accounts")
+  @@unique([provider, providerAccountId])
 }
 
 model Session {
-  id           Int      @default(autoincrement()) @id
-  userId       Int      @map(name: "user_id")
+  id           String   @id @default(cuid())
+  sessionToken String   @unique
+  userId       String
   expires      DateTime
-  sessionToken String   @unique @map(name: "session_token")
-  accessToken  String   @unique @map(name: "access_token")
-  createdAt    DateTime @default(now()) @map(name: "created_at")
-  updatedAt    DateTime @default(now()) @map(name: "updated_at")
-
-  @@map(name: "sessions")
+  user         User     @relation(fields: [userId], references: [id])
 }
 
 model User {
-  id            Int       @default(autoincrement()) @id
+  id            String    @id @default(cuid())
   name          String?
   email         String?   @unique
-  emailVerified DateTime? @map(name: "email_verified")
+  emailVerified DateTime?
   image         String?
-  createdAt     DateTime  @default(now()) @map(name: "created_at")
-  updatedAt     DateTime  @default(now()) @map(name: "updated_at")
-
-  @@map(name: "users")
+  accounts      Account[]
+  sessions      Session[]
 }
 
-model VerificationRequest {
-  id         Int      @default(autoincrement()) @id
+model VerificationToken {
   identifier String
   token      String   @unique
   expires    DateTime
-  createdAt  DateTime  @default(now()) @map(name: "created_at")
-  updatedAt  DateTime  @default(now()) @map(name: "updated_at")
 
-  @@map(name: "verification_requests")
-}
+  @@unique([identifier, token])
+}

app/tsconfig.json

@@ -0,0 +1,34 @@
+{
+  "compilerOptions": {
+    "target": "esnext",
+    "lib": [
+      "dom",
+      "dom.iterable",
+      "esnext"
+    ],
+    "allowJs": true,
+    "skipLibCheck": true,
+    "strict": false,
+    "forceConsistentCasingInFileNames": true,
+    "noEmit": true,
+    "esModuleInterop": true,
+    "module": "esnext",
+    "moduleResolution": "node",
+    "resolveJsonModule": true,
+    "isolatedModules": true,
+    "jsx": "preserve",
+    "baseUrl": ".",
+    "paths": {
+      "next-auth": [ "../src" ],
+      "next-auth/*": [ "../src/*" ]
+    }
+  },
+  "include": [
+    "next-env.d.ts",
+    "**/*.ts",
+    "**/*.tsx"
+  ],
+  "exclude": [
+    "node_modules"
+  ]
+}

config/babel.config.js

@@ -2,32 +2,60 @@
 // https://nextjs.org/docs/getting-started#system-requirements
 // https://nextjs.org/docs/basic-features/supported-browsers-features
 
-module.exports = {
-  presets: [["@babel/preset-env", { targets: { node: "10.13" } }]],
-  plugins: [
-    "@babel/plugin-proposal-optional-catch-binding",
-    "@babel/plugin-transform-runtime",
-  ],
-  comments: false,
-  overrides: [
-    {
-      test: ["../src/client/**"],
-      presets: [["@babel/preset-env", { targets: { ie: "11" } }]],
-    },
-    {
-      test: ["../src/server/pages/**"],
-      presets: ["preact"],
-    },
-    {
-      test: ["../src/**/*.test.js"],
+module.exports = (api) => {
+  const isTest = api.env("test")
+  if (isTest) {
+    return {
       presets: [
-        [
-          "@babel/preset-react",
-          {
-            runtime: "automatic",
-          },
-        ],
+        "@babel/preset-env",
+        ["@babel/preset-react", { runtime: "automatic" }],
+        ["@babel/preset-typescript", { isTSX: true, allExtensions: true }],
       ],
-    },
-  ],
+    }
+  }
+  return {
+    presets: [
+      ["@babel/preset-env", { targets: { node: 12 } }],
+      "@babel/preset-typescript",
+    ],
+    plugins: [
+      "@babel/plugin-proposal-optional-catch-binding",
+      "@babel/plugin-transform-runtime",
+    ],
+    ignore: [
+      "../src/**/__tests__/**",
+      "../src/adapters.ts",
+      "../src/lib/types.ts",
+      "../src/providers/oauth-types.ts",
+    ],
+    comments: false,
+    overrides: [
+      {
+        test: [
+          "../src/react/index.tsx",
+          "../src/lib/logger.ts",
+          "../src/core/errors.ts",
+          "../src/client/**",
+        ],
+        presets: [
+          ["@babel/preset-env", { targets: { ie: 11 } }],
+          ["@babel/preset-react", { runtime: "automatic" }],
+        ],
+      },
+      {
+        test: ["../src/core/pages/*.tsx"],
+        presets: ["preact"],
+        plugins: [
+          [
+            "jsx-pragmatic",
+            {
+              module: "preact",
+              export: "h",
+              import: "h",
+            },
+          ],
+        ],
+      },
+    ],
+  }
 }

config/build.js

@@ -1,91 +0,0 @@
-const fs = require("fs-extra")
-const path = require("path")
-
-const MODULE_ENTRIES = {
-  SERVER: "index",
-  CLIENT: "client",
-  PROVIDERS: "providers",
-  ADAPTERS: "adapters",
-  JWT: "jwt",
-  ERRORS: "errors",
-}
-
-// Building submodule entries
-
-const BUILD_TARGETS = {
-  [`${MODULE_ENTRIES.SERVER}.js`]: "module.exports = require('./dist/server').default\n",
-  [`${MODULE_ENTRIES.CLIENT}.js`]: "module.exports = require('./dist/client').default\n",
-  [`${MODULE_ENTRIES.ADAPTERS}.js`]: "module.exports = require('./dist/adapters').default\n",
-  [`${MODULE_ENTRIES.PROVIDERS}.js`]: "module.exports = require('./dist/providers').default\n",
-  [`${MODULE_ENTRIES.JWT}.js`]: "module.exports = require('./dist/lib/jwt').default\n",
-  [`${MODULE_ENTRIES.ERRORS}.js`]: "module.exports = require('./dist/lib/errors').default\n",
-}
-
-Object.entries(BUILD_TARGETS).forEach(([target, content]) => {
-  fs.writeFile(path.join(process.cwd(), target), content, (err) => {
-    if (err) throw err
-    console.log(`[build] created "${target}" in root folder`)
-  })
-})
-
-// Building types
-
-const TYPES_TARGETS = [
-  `${MODULE_ENTRIES.SERVER}.d.ts`,
-  `${MODULE_ENTRIES.CLIENT}.d.ts`,
-  `${MODULE_ENTRIES.ADAPTERS}.d.ts`,
-  `${MODULE_ENTRIES.PROVIDERS}.d.ts`,
-  `${MODULE_ENTRIES.JWT}.d.ts`,
-  `${MODULE_ENTRIES.ERRORS}.d.ts`,
-  "internals",
-]
-
-TYPES_TARGETS.forEach((target) => {
-  fs.copy(
-    path.resolve("types", target),
-    path.join(process.cwd(), target),
-    (err) => {
-      if (err) throw err
-      console.log(`[build-types] copying "${target}" to root folder`)
-    }
-  )
-})
-
-// Building providers
-
-const providersDir = path.join(process.cwd(), "/src/providers")
-
-const files = fs
-  .readdirSync(providersDir, "utf8")
-  .filter((file) => file !== "index.js")
-
-let importLines = ""
-let exportLines = `export default {\n`
-files.forEach((file) => {
-  const provider = fs.readFileSync(path.join(providersDir, file), "utf8")
-  try {
-    // NOTE: If this fails, the default export probably wasn't a named function.
-    // Always use a named function as default export.
-    // Eg.: export default function YourProvider ...
-    const { functionName } = provider.match(
-      /export default function (?<functionName>.+)\s?\(/
-    ).groups
-
-    importLines += `import ${functionName} from "./${file}"\n`
-    exportLines += `  ${functionName},\n`
-  } catch (error) {
-    console.error(
-      [
-        `\nThe provider file '${file}' should have a single named default export`,
-        "Example: 'export default function YourProvider'\n\n",
-      ].join("\n")
-    )
-    process.exit(1)
-  }
-})
-exportLines += `}\n`
-
-fs.writeFile(
-  path.join(process.cwd(), "src/providers/index.js"),
-  [importLines, exportLines].join("\n")
-)

config/generate-providers.js

@@ -0,0 +1,18 @@
+const path = require("path")
+const fs = require("fs")
+
+const providersPath = path.join(process.cwd(), "/src/providers")
+
+const files = fs.readdirSync(providersPath, "utf8")
+
+const providers = files.map((file) => {
+  const strippedProviderName = file.substring(0, file.indexOf("."))
+  return `"${strippedProviderName}"`
+})
+
+const result = `
+// THIS FILE IS AUTOGENERATED. DO NOT EDIT.
+export type OAuthProviderType = 
+  | ${providers.join("\n  | ")}`
+
+fs.writeFileSync(path.join(providersPath, "oauth-types.ts"), result)

config/jest-setup.js

@@ -1,2 +1,3 @@
+import "regenerator-runtime/runtime"
 import "@testing-library/jest-dom"
 import "whatwg-fetch"

config/jest.config.js

@@ -1,11 +1,19 @@
 /** @type {import('@jest/types').Config.InitialOptions} */
 module.exports = {
   transform: {
-    "\\.js$": ["babel-jest", { configFile: "./config/babel.config.js" }],
+    "\\.(js|jsx|ts|tsx)$": [
+      "babel-jest",
+      { configFile: "./config/babel.config.js" },
+    ],
   },
   rootDir: "../src",
   setupFilesAfterEnv: ["../config/jest-setup.js"],
   collectCoverageFrom: ["!client/__tests__/**"],
   testMatch: ["**/*.test.js"],
   coverageDirectory: "../coverage",
+  testEnvironment: "jsdom",
+  watchPlugins: [
+    "jest-watch-typeahead/filename",
+    "jest-watch-typeahead/testname",
+  ],
 }

config/version-pr/action.yml

@@ -0,0 +1,8 @@
+name: "Determine version"
+description: "Determines npm package version based on PR number and commit SHA"
+outputs:
+  version:
+    description: "npm package version"
+runs:
+  using: "node12"
+  main: "index.js"

config/version-pr/index.js

@@ -0,0 +1,18 @@
+const fs = require("fs-extra")
+const path = require("path")
+const core = require("@actions/core")
+
+try {
+  const packageJSONPath = path.join(process.cwd(), "package.json")
+  const packageJSON = JSON.parse(fs.readFileSync(packageJSONPath, "utf8"))
+
+  const sha8 = process.env.GITHUB_SHA.substr(0, 8)
+  const prNumber = process.env.PR_NUMBER
+
+  const packageVersion = `0.0.0-pr.${prNumber}.${sha8}`
+  packageJSON.version = packageVersion
+  core.setOutput("version", packageVersion)
+  fs.writeFileSync(packageJSONPath, JSON.stringify(packageJSON))
+} catch (error) {
+  core.setFailed(error.message)
+}

config/wrap-css.js

@@ -5,14 +5,13 @@
 // To work around this issue, this script is a manual step that wraps CSS in a
 // JavaScript file that has the compiled CSS embedded in it, and exports only
 // a function that returns the CSS as a string.
-const fs = require('fs')
-const path = require('path')
+const fs = require("fs")
+const path = require("path")
 
-const pathToCssJs = path.join(__dirname, '../dist/css/index.js')
-const pathToCss = path.join(__dirname, '../dist/css/index.css')
-
-const css = fs.readFileSync(pathToCss, 'utf8')
+const pathToCss = path.join(__dirname, "../css/index.css")
+const css = fs.readFileSync(pathToCss, "utf8")
 const cssWithEscapedQuotes = css.replace(/"/gm, '\\"')
-const js = `module.exports = function() { return "${cssWithEscapedQuotes}" }`
 
+const js = `module.exports = function() { return "${cssWithEscapedQuotes}" }`
+const pathToCssJs = path.join(__dirname, "../css/index.js")
 fs.writeFileSync(pathToCssJs, js)

package.json

@@ -5,8 +5,14 @@
   "homepage": "https://next-auth.js.org",
   "repository": "https://github.com/nextauthjs/next-auth.git",
   "author": "Iain Collins <me@iaincollins.com>",
+  "contributors": [
+    "Balázs Orbán <info@balazsorban.com>",
+    "Nico Domino <yo@ndo.dev>",
+    "Lluis Agusti <hi@llu.lu>"
+  ],
   "main": "index.js",
-  "types": "./index.d.ts",
+  "module": "index.js",
+  "types": "index.d.ts",
   "keywords": [
     "react",
     "nodejs",
@@ -20,115 +26,116 @@
     "nextauth"
   ],
   "exports": {
-    ".": "./dist/server/index.js",
-    "./jwt": "./dist/lib/jwt.js",
-    "./adapters": "./dist/adapters/index.js",
-    "./client": "./dist/client/index.js",
-    "./providers": "./dist/providers/index.js",
-    "./providers/*": "./dist/providers/*.js",
-    "./errors": "./dist/lib/errors.js"
+    ".": "./index.js",
+    "./jwt": "./jwt/index.js",
+    "./react": "./react/index.js",
+    "./core": "./core/index.js",
+    "./next": "./next/index.js",
+    "./client/_utils": "./client/_utils.js",
+    "./providers/*": "./providers/*.js"
   },
   "scripts": {
     "build": "npm run build:js && npm run build:css",
-    "build:js": "node ./config/build.js && babel --config-file ./config/babel.config.js src --out-dir dist",
-    "build:css": "postcss --config config/postcss.config.js src/**/*.css --base src --dir dist && node config/wrap-css.js",
-    "dev:setup": "npm i && npm run build:css && cd app && npm i",
+    "clean": "rm -rf client css lib providers core jwt react next index.d.ts index.js adapters.d.ts",
+    "build:js": "npm run clean && npm run generate-providers && tsc && babel --config-file ./config/babel.config.js src --out-dir . --extensions \".tsx,.ts,.js,.jsx\"",
+    "build:css": "postcss --config config/postcss.config.js src/**/*.css --base src --dir . && node config/wrap-css.js",
+    "dev:setup": "npm i && npm run generate-providers && npm run build:css && cd app && npm i",
     "dev": "cd app && npm run dev",
-    "watch": "npm run watch:js | npm run watch:css",
-    "watch:js": "babel --config-file ./config/babel.config.js --watch src --out-dir dist",
-    "watch:css": "postcss --config config/postcss.config.js --watch src/**/*.css --base src --dir dist",
+    "watch:css": "postcss --config config/postcss.config.js --watch src/**/*.css --base src --dir .",
     "test": "jest --config ./config/jest.config.js",
-    "test:ci": "npm run lint && npm run test:types && npm run test -- --ci",
-    "test:types": "dtslint types --onlyTestTsNext",
+    "test:ci": "npm run lint && npm run test -- --ci",
     "prepublishOnly": "npm run build",
     "lint": "eslint .",
     "lint:fix": "eslint . --fix",
-    "version:pr": "node ./config/version-pr"
+    "version:pr": "node ./config/version-pr",
+    "generate-providers": "node ./config/generate-providers.js"
   },
   "files": [
-    "dist",
-    "index.js",
+    "lib",
+    "css",
+    "jwt",
+    "react",
+    "next",
+    "client",
+    "providers",
+    "core",
     "index.d.ts",
-    "providers.js",
-    "providers.d.ts",
-    "adapters.js",
-    "adapters.d.ts",
-    "client.js",
-    "client.d.ts",
-    "errors.js",
-    "errors.d.ts",
-    "jwt.js",
-    "jwt.d.ts",
-    "internals"
+    "index.js",
+    "adapters.d.ts"
   ],
   "license": "ISC",
   "dependencies": {
-    "@babel/runtime": "^7.14.0",
-    "@next-auth/prisma-legacy-adapter": "0.1.2",
-    "@next-auth/typeorm-legacy-adapter": "0.1.4",
-    "futoin-hkdf": "^1.3.2",
-    "jose": "^1.27.2",
-    "jsonwebtoken": "^8.5.1",
-    "nodemailer": "^6.4.16",
+    "@babel/runtime": "^7.15.4",
+    "@panva/hkdf": "^1.0.0",
+    "cookie": "^0.4.1",
+    "jose": "^4.1.2",
     "oauth": "^0.9.15",
-    "pkce-challenge": "^2.1.0",
-    "preact": "^10.4.1",
-    "preact-render-to-string": "^5.1.14",
-    "querystring": "^0.2.0"
+    "openid-client": "^5.0.2",
+    "preact": "^10.5.14",
+    "preact-render-to-string": "^5.1.19",
+    "uuid": "^8.3.2"
   },
   "peerDependencies": {
-    "react": "^16.13.1 || ^17",
-    "react-dom": "^16.13.1 || ^17"
+    "nodemailer": "^6.6.5",
+    "react": "^17.0.2",
+    "react-dom": "^17.0.2"
   },
-  "peerOptionalDependencies": {
-    "mongodb": "^3.5.9",
-    "mysql": "^2.18.1",
-    "mssql": "^6.2.1",
-    "pg": "^8.2.1",
-    "@prisma/client": "^2.16.1"
+  "peerDependenciesMeta": {
+    "nodemailer": {
+      "optional": true
+    }
   },
   "devDependencies": {
-    "@babel/cli": "^7.8.4",
-    "@babel/core": "^7.9.6",
-    "@babel/plugin-proposal-optional-catch-binding": "^7.14.2",
-    "@babel/plugin-transform-runtime": "^7.13.15",
-    "@babel/preset-env": "^7.9.6",
-    "@babel/preset-react": "^7.13.13",
-    "@testing-library/jest-dom": "^5.12.0",
-    "@testing-library/react": "^11.2.6",
-    "@testing-library/user-event": "^13.1.9",
-    "@types/nodemailer": "^6.4.2",
-    "@types/react": "^17.0.0",
-    "@typescript-eslint/eslint-plugin": "^4.22.0",
-    "@typescript-eslint/parser": "^4.22.0",
-    "autoprefixer": "^9.7.6",
-    "babel-jest": "^26.6.3",
+    "@actions/core": "^1.6.0",
+    "@babel/cli": "^7.15.7",
+    "@babel/core": "^7.15.5",
+    "@babel/plugin-proposal-optional-catch-binding": "^7.14.5",
+    "@babel/plugin-transform-runtime": "^7.15.0",
+    "@babel/preset-env": "^7.15.6",
+    "@babel/preset-react": "^7.14.5",
+    "@babel/preset-typescript": "^7.15.0",
+    "@testing-library/jest-dom": "^5.14.1",
+    "@testing-library/react": "^12.1.2",
+    "@testing-library/react-hooks": "^7.0.2",
+    "@testing-library/user-event": "^13.2.1",
+    "@types/node": "^16.11.6",
+    "@types/nodemailer": "^6.4.4",
+    "@types/oauth": "^0.9.1",
+    "@types/react": "^17.0.27",
+    "@types/react-dom": "^17.0.9",
+    "@typescript-eslint/eslint-plugin": "^4.33.0",
+    "@typescript-eslint/parser": "^4.33.0",
+    "autoprefixer": "^10.3.7",
+    "babel-jest": "^27.3.0",
+    "babel-plugin-jsx-pragmatic": "^1.0.2",
     "babel-preset-preact": "^2.0.0",
-    "conventional-changelog-conventionalcommits": "4.4.0",
-    "cssnano": "^4.1.10",
-    "dotenv": "^8.2.0",
-    "dtslint": "^4.0.8",
-    "eslint": "^7.19.0",
-    "eslint-config-prettier": "^8.2.0",
-    "eslint-config-standard-with-typescript": "^19.0.1",
-    "eslint-plugin-import": "^2.22.1",
-    "eslint-plugin-jest": "^24.3.6",
+    "conventional-changelog-conventionalcommits": "4.6.1",
+    "cssnano": "^5.0.8",
+    "eslint": "^7.32.0",
+    "eslint-config-prettier": "^8.3.0",
+    "eslint-config-standard-with-typescript": "^21.0.1",
+    "eslint-plugin-import": "^2.24.2",
+    "eslint-plugin-jest": "^25.2.2",
     "eslint-plugin-node": "^11.1.0",
-    "eslint-plugin-promise": "^4.3.1",
-    "eslint-plugin-standard": "^5.0.0",
-    "husky": "^6.0.0",
-    "jest": "^26.6.3",
-    "msw": "^0.28.2",
-    "next": "^11.0.1",
-    "postcss-cli": "^7.1.1",
-    "postcss-nested": "^4.2.1",
-    "prettier": "^2.2.1",
-    "pretty-quick": "^3.1.0",
+    "eslint-plugin-promise": "^5.1.0",
+    "fs-extra": "^10.0.0",
+    "husky": "^7.0.2",
+    "jest": "^27.3.0",
+    "jest-watch-typeahead": "^1.0.0",
+    "msw": "^0.35.0",
+    "next": "v11.1.3-canary.0",
+    "postcss-cli": "^9.0.1",
+    "postcss-nested": "^5.0.6",
+    "prettier": "^2.4.1",
+    "pretty-quick": "^3.1.1",
     "react": "^17.0.2",
     "react-dom": "^17.0.2",
-    "typescript": "^4.1.3",
+    "typescript": "^4.4.3",
     "whatwg-fetch": "^3.6.2"
   },
+  "engines": {
+    "node": "^12.19.0 || ^14.15.0 || ^16.13.0"
+  },
   "prettier": {
     "semi": false
   },
@@ -137,38 +144,36 @@
     "parserOptions": {
       "project": "./tsconfig.json"
     },
-    "extends": [
-      "standard-with-typescript",
-      "prettier"
-    ],
+    "extends": ["standard-with-typescript", "prettier"],
     "ignorePatterns": [
       "node_modules",
-      "test",
       "next-env.d.ts",
       "types",
-      "www",
       ".next",
-      "dist"
+      "dist",
+      "/core",
+      "/react.js"
     ],
     "globals": {
       "localStorage": "readonly",
       "location": "readonly",
       "fetch": "readonly"
     },
+    "rules": {
+      "camelcase": "off",
+      "@typescript-eslint/naming-convention": "off",
+      "@typescript-eslint/strict-boolean-expressions": "off",
+      "@typescript-eslint/explicit-function-return-type": "off",
+      "@typescript-eslint/restrict-template-expressions": "off"
+    },
     "overrides": [
       {
-        "files": [
-          "./**/*test.js"
-        ],
+        "files": ["./**/*test.js"],
         "env": {
           "jest/globals": true
         },
-        "extends": [
-          "plugin:jest/recommended"
-        ],
-        "plugins": [
-          "jest"
-        ]
+        "extends": ["plugin:jest/recommended"],
+        "plugins": ["jest"]
       }
     ]
   },
@@ -202,6 +207,10 @@
     {
       "type": "github",
       "url": "https://github.com/sponsors/balazsorban44"
+    },
+    {
+      "type": "opencollective",
+      "url": "https://opencollective.com/nextauth"
     }
   ]
 }

src/adapters.ts

@@ -0,0 +1,109 @@
+import { Account, User, Awaitable } from "."
+
+export interface AdapterUser extends User {
+  id: string
+  emailVerified: Date | null
+}
+
+export interface AdapterSession {
+  id: string
+  /** A randomly generated value that is used to get hold of the session. */
+  sessionToken: string
+  /** Used to connect the session to a particular user */
+  userId: string
+  expires: Date
+}
+
+export interface VerificationToken {
+  identifier: string
+  expires: Date
+  token: string
+}
+
+/**
+ * Using a custom adapter you can connect to any database backend or even several different databases.
+ * Custom adapters created and maintained by our community can be found in the adapters repository.
+ * Feel free to add a custom adapter from your project to the repository,
+ * or even become a maintainer of a certain adapter.
+ * Custom adapters can still be created and used in a project without being added to the repository.
+ *
+ * **Required methods**
+ *
+ * _(These methods are required for all sign in flows)_
+ * - `createUser`
+ * - `getUser`
+ * - `getUserByEmail`
+ * - `getUserByAccount`
+ * - `linkAccount`
+ * - `createSession`
+ * - `getSessionAndUser`
+ * - `updateSession`
+ * - `deleteSession`
+ * - `updateUser`
+ *
+ * _(Required to support email / passwordless sign in)_
+ *
+ * - `createVerificationToken`
+ * - `useVerificationToken`
+ *
+ * **Unimplemented methods**
+ *
+ * _(These methods will be required in a future release, but are not yet invoked)_
+ * - `deleteUser`
+ * - `unlinkAccount`
+ *
+ * [Community adapters](https://github.com/nextauthjs/adapters) |
+ * [Create a custom adapter](https://next-auth.js.org/tutorials/creating-a-database-adapter)
+ */
+export interface Adapter {
+  createUser: (user: Omit<AdapterUser, "id">) => Awaitable<AdapterUser>
+  getUser: (id: string) => Awaitable<AdapterUser | null>
+  getUserByEmail: (email: string) => Awaitable<AdapterUser | null>
+  /** Using the provider id and the id of the user for a specific account, get the user. */
+  getUserByAccount: (
+    providerAccountId: Pick<Account, "provider" | "providerAccountId">
+  ) => Awaitable<AdapterUser | null>
+  updateUser: (user: Partial<AdapterUser>) => Awaitable<AdapterUser>
+  /** @todo Implement */
+  deleteUser?: (
+    userId: string
+  ) => Promise<void> | Awaitable<AdapterUser | null | undefined>
+  linkAccount: (
+    account: Account
+  ) => Promise<void> | Awaitable<Account | null | undefined>
+  /** @todo Implement */
+  unlinkAccount?: (
+    providerAccountId: Pick<Account, "provider" | "providerAccountId">
+  ) => Promise<void> | Awaitable<Account | undefined>
+  /** Creates a session for the user and returns it. */
+  createSession: (session: {
+    sessionToken: string
+    userId: string
+    expires: Date
+  }) => Awaitable<AdapterSession>
+  getSessionAndUser: (
+    sessionToken: string
+  ) => Awaitable<{ session: AdapterSession; user: AdapterUser } | null>
+  updateSession: (
+    session: Partial<AdapterSession> & Pick<AdapterSession, "sessionToken">
+  ) => Awaitable<AdapterSession | null | undefined>
+  /**
+   * Deletes a session from the database.
+   * It is preferred that this method also returns the session
+   * that is being deleted for logging purposes.
+   */
+  deleteSession: (
+    sessionToken: string
+  ) => Promise<void> | Awaitable<AdapterSession | null | undefined>
+  createVerificationToken?: (
+    verificationToken: VerificationToken
+  ) => Awaitable<VerificationToken | null | undefined>
+  /**
+   * Return verification token from the database
+   * and delete it so it cannot be used again.
+   */
+  useVerificationToken?: (params: {
+    identifier: string
+    token: string
+  }) => Awaitable<VerificationToken | null>
+}

src/adapters/error-handler.js

@@ -1,36 +0,0 @@
-import { UnknownError } from "../lib/errors"
-
-/**
- * Handles adapter induced errors.
- * @param {import("types/adapters").AdapterInstance} adapter
- * @param {import("types").LoggerInstance} logger
- * @return {import("types/adapters").AdapterInstance}
- */
-export default function adapterErrorHandler(adapter, logger) {
-  return Object.keys(adapter).reduce((acc, method) => {
-    const name = capitalize(method)
-    const code = upperSnake(name, adapter.displayName)
-
-    const adapterMethod = adapter[method]
-    acc[method] = async (...args) => {
-      try {
-        logger.debug(code, ...args)
-        return await adapterMethod(...args)
-      } catch (error) {
-        logger.error(`${code}_ERROR`, error)
-        const e = new UnknownError(error)
-        e.name = `${name}Error`
-        throw e
-      }
-    }
-    return acc
-  }, {})
-}
-
-function capitalize(s) {
-  return `${s[0].toUpperCase()}${s.slice(1)}`
-}
-
-function upperSnake(s, prefix = "ADAPTER") {
-  return `${prefix}_${s.replace(/([A-Z])/g, "_$1")}`.toUpperCase()
-}

src/adapters/index.js

@@ -1,10 +0,0 @@
-import * as TypeORM from "./typeorm"
-import * as Prisma from "./prisma"
-
-export { TypeORM, Prisma }
-
-export default {
-  Default: TypeORM.Adapter,
-  TypeORM,
-  Prisma,
-}

src/adapters/prisma.js

@@ -1,6 +0,0 @@
-/*
- * Source code can be found at:
- * https://github.com/nextauthjs/adapters/tree/canary/packages/prisma-legacy
- */
-
-export { PrismaLegacyAdapter as Adapter } from "@next-auth/prisma-legacy-adapter"

src/adapters/typeorm.js

@@ -1,9 +0,0 @@
-/*
- * Source code can be found at:
- * https://github.com/nextauthjs/adapters/tree/canary/packages/typeorm-legacy
- */
-
-export {
-  TypeORMLegacyAdapter as Adapter,
-  Models,
-} from "@next-auth/typeorm-legacy-adapter"

src/client/__tests__/client-provider.test.js

@@ -1,17 +1,20 @@
-import { useState } from "react"
 import { rest } from "msw"
 import { render, screen, waitFor } from "@testing-library/react"
 import { server, mockSession } from "./helpers/mocks"
-import { Provider, useSession } from ".."
-import userEvent from "@testing-library/user-event"
+import { printFetchCalls } from "./helpers/utils"
+import { SessionProvider, useSession, signOut, getSession } from "../../react"
+
+const origDocumentVisibility = document.visibilityState
+const fetchSpy = jest.spyOn(global, "fetch")
 
 beforeAll(() => {
   server.listen()
 })
 
 afterEach(() => {
-  jest.clearAllMocks()
   server.resetHandlers()
+  changeTabVisibility(origDocumentVisibility)
+  fetchSpy.mockClear()
 })
 
 afterAll(() => {
@@ -19,46 +22,167 @@ afterAll(() => {
 })
 
 test("fetches the session once and re-uses it for different consumers", async () => {
-  const sessionRouteCall = jest.fn()
-
-  server.use(
-    rest.get("/api/auth/session", (req, res, ctx) => {
-      sessionRouteCall()
-      res(ctx.status(200), ctx.json(mockSession))
-    })
-  )
-
   render(<ProviderFlow />)
 
-  await waitFor(() => {
-    expect(sessionRouteCall).toHaveBeenCalledTimes(1)
+  expect(screen.getByTestId("session-1")).toHaveTextContent("loading")
+  expect(screen.getByTestId("session-2")).toHaveTextContent("loading")
 
-    const session1 = screen.getByTestId("session-consumer-1").textContent
-    const session2 = screen.getByTestId("session-consumer-2").textContent
+  return waitFor(() => {
+    expect(fetchSpy).toHaveBeenCalledTimes(1)
+
+    expect(fetchSpy).toHaveBeenCalledWith(
+      "/api/auth/session",
+      expect.anything()
+    )
+
+    const session1 = screen.getByTestId("session-1").textContent
+    const session2 = screen.getByTestId("session-2").textContent
 
     expect(session1).toEqual(session2)
   })
 })
 
-function ProviderFlow({ options = {} }) {
+test("when there's an existing session, it won't try to fetch a new one straightaway", async () => {
+  render(<ProviderFlow session={mockSession} />)
+
+  expect(fetchSpy).not.toHaveBeenCalled()
+})
+
+test("will refetch the session when the browser tab becomes active again", async () => {
+  render(<ProviderFlow session={mockSession} />)
+
+  expect(fetchSpy).not.toHaveBeenCalled()
+
+  // Hide the current tab
+  changeTabVisibility("hidden")
+
+  // Given the current tab got hidden, it should not attempt to re-fetch the session
+  expect(fetchSpy).not.toHaveBeenCalled()
+
+  // Make the tab again visible
+  changeTabVisibility("visible")
+
+  // Given the user made the tab visible again, now attempts to sync and re-fetch the session
+  return waitFor(() => {
+    expect(fetchSpy).toHaveBeenCalledTimes(1)
+    expect(fetchSpy).toHaveBeenCalledWith(
+      "/api/auth/session",
+      expect.anything()
+    )
+  })
+})
+
+test("will refetch the session if told to do so programmatically from another window", async () => {
+  render(<ProviderFlow session={mockSession} />)
+
+  expect(fetchSpy).not.toHaveBeenCalled()
+
+  // Hide the current tab
+  changeTabVisibility("hidden")
+
+  // Given the current tab got hidden, it should not attempt to re-fetch the session
+  expect(fetchSpy).not.toHaveBeenCalled()
+
+  // simulate sign-out triggered by another tab
+  signOut({ redirect: false })
+
+  // Given signed out in another tab, it attempts to sync and re-fetch the session
+  return waitFor(() => {
+    expect(fetchSpy).toHaveBeenCalledWith(
+      "/api/auth/session",
+      expect.anything()
+    )
+
+    // We should have a call to sign-out and a call to refetch the session accordingly
+    expect(printFetchCalls(fetchSpy.mock.calls)).toMatchInlineSnapshot(`
+      Array [
+        "GET /api/auth/csrf",
+        "POST /api/auth/signout",
+        "GET /api/auth/session",
+      ]
+    `)
+  })
+})
+
+test("allows to customize how often the session will be re-fetched through polling", () => {
+  jest.useFakeTimers()
+
+  render(<ProviderFlow session={mockSession} refetchInterval={1} />)
+
+  // we provided a mock session so it shouldn't try to fetch a new one
+  expect(fetchSpy).not.toHaveBeenCalled()
+
+  jest.advanceTimersByTime(1000)
+
+  expect(fetchSpy).toHaveBeenCalledTimes(1)
+  expect(fetchSpy).toHaveBeenCalledWith("/api/auth/session", expect.anything())
+
+  jest.advanceTimersByTime(1000)
+
+  // it should have tried to refetch the session, hence counting 2 calls to the session endpoint
+  expect(fetchSpy).toHaveBeenCalledTimes(2)
+  expect(printFetchCalls(fetchSpy.mock.calls)).toMatchInlineSnapshot(`
+      Array [
+        "GET /api/auth/session",
+        "GET /api/auth/session",
+      ]
+    `)
+})
+
+test("allows to customize the URL for session fetching", async () => {
+  const myPath = "/api/v1/auth"
+
+  server.use(
+    rest.get(`${myPath}/session`, (req, res, ctx) =>
+      res(ctx.status(200), ctx.json(mockSession))
+    )
+  )
+
+  render(<ProviderFlow session={mockSession} basePath={myPath} />)
+
+  // there's an existing session so it should not try to fetch a new one
+  expect(fetchSpy).not.toHaveBeenCalled()
+
+  // force a session refetch across all clients...
+  getSession()
+
+  return waitFor(() => {
+    expect(fetchSpy).toHaveBeenCalledTimes(1)
+    expect(fetchSpy).toHaveBeenCalledWith(
+      `${myPath}/session`,
+      expect.anything()
+    )
+  })
+})
+
+function ProviderFlow(props) {
   return (
-    <>
-      <Provider options={options}>
-        <SessionConsumer />
-        <SessionConsumer testId="2" />
-      </Provider>
-    </>
+    <SessionProvider {...props}>
+      <SessionConsumer />
+      <SessionConsumer testId="2" />
+    </SessionProvider>
   )
 }
 
-function SessionConsumer({ testId = 1 }) {
-  const [session, loading] = useSession()
-
-  if (loading) return <span>loading</span>
+function SessionConsumer({ testId = 1, ...rest }) {
+  const { data: session, status } = useSession(rest)
 
   return (
-    <div data-testid={`session-consumer-${testId}`}>
-      {JSON.stringify(session)}
+    <div data-testid={`session-${testId}`}>
+      {status === "loading" ? "loading" : JSON.stringify(session)}
     </div>
   )
 }
+
+function changeTabVisibility(status) {
+  const visibleStates = ["visible", "hidden"]
+
+  if (!visibleStates.includes(status)) return
+
+  Object.defineProperty(document, "visibilityState", {
+    configurable: true,
+    value: status,
+  })
+
+  document.dispatchEvent(new Event("visibilitychange"))
+}

src/client/__tests__/csrf.test.js

@@ -3,7 +3,7 @@ import userEvent from "@testing-library/user-event"
 import { render, screen, waitFor } from "@testing-library/react"
 import { server, mockCSRFToken } from "./helpers/mocks"
 import logger from "../../lib/logger"
-import { getCsrfToken } from ".."
+import { getCsrfToken } from "../../react"
 import { rest } from "msw"
 
 jest.mock("../../lib/logger", () => ({
@@ -78,11 +78,10 @@ test("when the fetch fails it'll throw a client fetch error", async () => {
 
   await waitFor(() => {
     expect(logger.error).toHaveBeenCalledTimes(1)
-    expect(logger.error).toBeCalledWith(
-      "CLIENT_FETCH_ERROR",
-      "csrf",
-      new SyntaxError("Unexpected token s in JSON at position 0")
-    )
+    expect(logger.error).toBeCalledWith("CLIENT_FETCH_ERROR", {
+      path: "csrf",
+      error: new SyntaxError("Unexpected token s in JSON at position 0"),
+    })
   })
 })
 

src/client/__tests__/helpers/mocks.js

@@ -65,26 +65,28 @@ export const mockSignOutResponse = {
 }
 
 export const server = setupServer(
-  rest.post("/api/auth/signout", (req, res, ctx) =>
+  rest.post("http://localhost/api/auth/signout", (req, res, ctx) =>
     res(ctx.status(200), ctx.json(mockSignOutResponse))
   ),
-  rest.get("/api/auth/session", (req, res, ctx) =>
+  rest.get("http://localhost/api/auth/session", (req, res, ctx) =>
     res(ctx.status(200), ctx.json(mockSession))
   ),
-  rest.get("/api/auth/csrf", (req, res, ctx) =>
+  rest.get("http://localhost/api/auth/csrf", (req, res, ctx) =>
     res(ctx.status(200), ctx.json(mockCSRFToken))
   ),
-  rest.get("/api/auth/providers", (req, res, ctx) =>
+  rest.get("http://localhost/api/auth/providers", (req, res, ctx) =>
     res(ctx.status(200), ctx.json(mockProviders))
   ),
-  rest.post("/api/auth/signin/github", (req, res, ctx) =>
+  rest.post("http://localhost/api/auth/signin/github", (req, res, ctx) =>
     res(ctx.status(200), ctx.json(mockGithubResponse))
   ),
-  rest.post("/api/auth/callback/credentials", (req, res, ctx) =>
+  rest.post("http://localhost/api/auth/callback/credentials", (req, res, ctx) =>
     res(ctx.status(200), ctx.json(mockCredentialsResponse))
   ),
-  rest.post("/api/auth/signin/email", (req, res, ctx) =>
+  rest.post("http://localhost/api/auth/signin/email", (req, res, ctx) =>
     res(ctx.status(200), ctx.json(mockEmailResponse))
   ),
-  rest.post("/api/auth/_log", (req, res, ctx) => res(ctx.status(200)))
+  rest.post("http://localhost/api/auth/_log", (req, res, ctx) =>
+    res(ctx.status(200))
+  )
 )

src/client/__tests__/helpers/utils.js

@@ -6,3 +6,9 @@ export function getBroadcastEvents() {
       return { eventName, value: rest }
     })
 }
+
+export function printFetchCalls(mockCalls) {
+  return mockCalls.map(([path, { method = "GET" }]) => {
+    return `${method.toUpperCase()} ${path}`
+  })
+}

src/client/__tests__/providers.test.js

@@ -2,7 +2,7 @@ import { useState } from "react"
 import userEvent from "@testing-library/user-event"
 import { render, screen, waitFor } from "@testing-library/react"
 import { server, mockProviders } from "./helpers/mocks"
-import { getProviders } from ".."
+import { getProviders } from "../../react"
 import logger from "../../lib/logger"
 import { rest } from "msw"
 
@@ -56,11 +56,10 @@ test("when failing to fetch the providers, it'll log the error", async () => {
 
   await waitFor(() => {
     expect(logger.error).toHaveBeenCalledTimes(1)
-    expect(logger.error).toBeCalledWith(
-      "CLIENT_FETCH_ERROR",
-      "providers",
-      new SyntaxError("Unexpected token s in JSON at position 0")
-    )
+    expect(logger.error).toBeCalledWith("CLIENT_FETCH_ERROR", {
+      path: "providers",
+      error: new SyntaxError("Unexpected token s in JSON at position 0"),
+    })
   })
 })
 

src/client/__tests__/session.test.js

@@ -3,7 +3,7 @@ import { rest } from "msw"
 import { server, mockSession } from "./helpers/mocks"
 import logger from "../../lib/logger"
 import { useState, useEffect } from "react"
-import { getSession } from ".."
+import { getSession } from "../../react"
 import { getBroadcastEvents } from "./helpers/utils"
 
 jest.mock("../../lib/logger", () => ({
@@ -70,11 +70,10 @@ test("if there's an error fetching the session, it should log it", async () => {
 
   await waitFor(() => {
     expect(logger.error).toHaveBeenCalledTimes(1)
-    expect(logger.error).toBeCalledWith(
-      "CLIENT_FETCH_ERROR",
-      "session",
-      new SyntaxError("Unexpected token S in JSON at position 0")
-    )
+    expect(logger.error).toBeCalledWith("CLIENT_FETCH_ERROR", {
+      path: "session",
+      error: new SyntaxError("Unexpected token S in JSON at position 0"),
+    })
   })
 })
 

src/client/__tests__/sign-in.test.js

@@ -8,7 +8,7 @@ import {
   mockEmailResponse,
   mockGithubResponse,
 } from "./helpers/mocks"
-import { signIn } from ".."
+import { signIn } from "../../react"
 import { rest } from "msw"
 
 const { location } = window
@@ -27,12 +27,22 @@ jest.mock("../../lib/logger", () => ({
 
 beforeAll(() => {
   server.listen()
+
+  let _href = window.location.href
+  // Allows to mutate `window.location`...
   delete window.location
+
   window.location = {
-    ...location,
-    replace: jest.fn(),
     reload: jest.fn(),
   }
+  Object.defineProperty(window.location, "href", {
+    get: () => _href,
+    // whatwg-fetch or whatwg-url does not seem to work with relative URLs
+    set: (href) => {
+      _href = href.startsWith("/") ? `http://localhost${href}` : href
+      return _href
+    },
+  })
 })
 
 beforeEach(() => {
@@ -59,9 +69,10 @@ test.each`
     userEvent.click(screen.getByRole("button"))
 
     await waitFor(() => {
-      expect(window.location.replace).toHaveBeenCalledTimes(1)
-      expect(window.location.replace).toHaveBeenCalledWith(
-        `/api/auth/signin?callbackUrl=${encodeURIComponent(callbackUrl)}`
+      expect(window.location.href).toBe(
+        `http://localhost/api/auth/signin?${new URLSearchParams({
+          callbackUrl,
+        })}`
       )
     })
   }
@@ -76,14 +87,14 @@ test.each`
   async ({ provider }) => {
     render(<SignInFlow providerId={provider} />)
 
+    const callbackUrl = window.location.href
     userEvent.click(screen.getByRole("button"))
 
     await waitFor(() => {
-      expect(window.location.replace).toHaveBeenCalledTimes(1)
-      expect(window.location.replace).toHaveBeenCalledWith(
-        `/api/auth/signin?callbackUrl=${encodeURIComponent(
-          window.location.href
-        )}`
+      expect(window.location.href).toBe(
+        `http://localhost/api/auth/signin?${new URLSearchParams({
+          callbackUrl,
+        })}`
       )
     })
   }
@@ -101,8 +112,7 @@ test.each`
     userEvent.click(screen.getByRole("button"))
 
     await waitFor(() => {
-      expect(window.location.replace).toHaveBeenCalledTimes(1)
-      expect(window.location.replace).toHaveBeenCalledWith(mockUrl)
+      expect(window.location.href).toBe(mockUrl)
     })
   }
 )
@@ -119,8 +129,7 @@ test("redirection can't be stopped using an oauth provider", async () => {
   userEvent.click(screen.getByRole("button"))
 
   await waitFor(() => {
-    expect(window.location.replace).toHaveBeenCalledTimes(1)
-    expect(window.location.replace).toHaveBeenCalledWith(mockGithubResponse.url)
+    expect(window.location.href).toBe(mockGithubResponse.url)
   })
 })
 
@@ -136,9 +145,7 @@ test("redirection can be stopped using the 'credentials' provider", async () =>
   userEvent.click(screen.getByRole("button"))
 
   await waitFor(() => {
-    expect(window.location.replace).not.toHaveBeenCalledWith(
-      mockCredentialsResponse.url
-    )
+    expect(window.location.href).not.toBe(mockCredentialsResponse.url)
 
     expect(screen.getByTestId("signin-result").textContent).not.toBe(
       "no response"
@@ -165,9 +172,7 @@ test("redirection can be stopped using the 'email' provider", async () => {
   userEvent.click(screen.getByRole("button"))
 
   await waitFor(() => {
-    expect(window.location.replace).not.toHaveBeenCalledWith(
-      mockEmailResponse.url
-    )
+    expect(window.location.href).not.toBe(mockEmailResponse.url)
 
     expect(screen.getByTestId("signin-result").textContent).not.toBe(
       "no response"
@@ -190,7 +195,7 @@ test("if callback URL contains a hash we force a window reload when re-directing
   const mockUrlWithHash = "https://path/to/email/url#foo-bar-baz"
 
   server.use(
-    rest.post("/api/auth/signin/email", (req, res, ctx) => {
+    rest.post("http://localhost/api/auth/signin/email", (req, res, ctx) => {
       return res(
         ctx.status(200),
         ctx.json({
@@ -206,8 +211,7 @@ test("if callback URL contains a hash we force a window reload when re-directing
   userEvent.click(screen.getByRole("button"))
 
   await waitFor(() => {
-    expect(window.location.replace).toHaveBeenCalledTimes(1)
-    expect(window.location.replace).toHaveBeenCalledWith(mockUrlWithHash)
+    expect(window.location.href).toBe(mockUrlWithHash)
     // the browser will not refresh the page if the redirect URL contains a hash, hence we force it on the client, see #1289
     expect(window.location.reload).toHaveBeenCalledTimes(1)
   })
@@ -218,7 +222,7 @@ test("params are propagated to the signin URL when supplied", async () => {
   const authParams = "foo=bar&bar=foo"
 
   server.use(
-    rest.post("/api/auth/signin/github", (req, res, ctx) => {
+    rest.post("http://localhost/api/auth/signin/github", (req, res, ctx) => {
       matchedParams = req.url.search
       return res(ctx.status(200), ctx.json(mockGithubResponse))
     })
@@ -237,7 +241,7 @@ test("when it fails to fetch the providers, it redirected back to signin page",
   const errorMsg = "Error when retrieving providers"
 
   server.use(
-    rest.get("/api/auth/providers", (req, res, ctx) =>
+    rest.get("http://localhost/api/auth/providers", (req, res, ctx) =>
       res(ctx.status(500), ctx.json(errorMsg))
     )
   )
@@ -247,14 +251,13 @@ test("when it fails to fetch the providers, it redirected back to signin page",
   userEvent.click(screen.getByRole("button"))
 
   await waitFor(() => {
-    expect(window.location.replace).toHaveBeenCalledWith(`/api/auth/error`)
+    expect(window.location.href).toBe(`http://localhost/api/auth/error`)
 
     expect(logger.error).toHaveBeenCalledTimes(1)
-    expect(logger.error).toBeCalledWith(
-      "CLIENT_FETCH_ERROR",
-      "providers",
-      errorMsg
-    )
+    expect(logger.error).toBeCalledWith("CLIENT_FETCH_ERROR", {
+      error: "Error when retrieving providers",
+      path: "providers",
+    })
   })
 })
 
@@ -269,10 +272,7 @@ function SignInFlow({
   async function handleSignIn() {
     const result = await signIn(
       providerId,
-      {
-        callbackUrl,
-        redirect,
-      },
+      { callbackUrl, redirect },
       authorizationParams
     )
 

src/client/__tests__/sign-out.test.js

@@ -2,7 +2,7 @@ import { useState } from "react"
 import userEvent from "@testing-library/user-event"
 import { render, screen, waitFor } from "@testing-library/react"
 import { server, mockSignOutResponse } from "./helpers/mocks"
-import { signOut } from ".."
+import { signOut } from "../../react"
 import { rest } from "msw"
 import { getBroadcastEvents } from "./helpers/utils"
 
@@ -10,11 +10,11 @@ const { location } = window
 
 beforeAll(() => {
   server.listen()
+  // Allows to mutate `window.location`...
   delete window.location
   window.location = {
-    ...location,
-    replace: jest.fn(),
     reload: jest.fn(),
+    href: location.href,
   }
 })
 
@@ -37,7 +37,7 @@ const callbackUrl = "https://redirects/to"
 
 test("by default it redirects to the current URL if the server did not provide one", async () => {
   server.use(
-    rest.post("/api/auth/signout", (req, res, ctx) =>
+    rest.post("http://localhost/api/auth/signout", (req, res, ctx) =>
       res(ctx.status(200), ctx.json({ ...mockSignOutResponse, url: undefined }))
     )
   )
@@ -47,8 +47,7 @@ test("by default it redirects to the current URL if the server did not provide o
   userEvent.click(screen.getByRole("button"))
 
   await waitFor(() => {
-    expect(window.location.replace).toHaveBeenCalledTimes(1)
-    expect(window.location.replace).toHaveBeenCalledWith(window.location.href)
+    expect(window.location.href).toBe(window.location.href)
   })
 })
 
@@ -58,10 +57,7 @@ test("it redirects to the URL allowed by the server", async () => {
   userEvent.click(screen.getByRole("button"))
 
   await waitFor(() => {
-    expect(window.location.replace).toHaveBeenCalledTimes(1)
-    expect(window.location.replace).toHaveBeenCalledWith(
-      mockSignOutResponse.url
-    )
+    expect(window.location.href).toBe(mockSignOutResponse.url)
   })
 })
 
@@ -69,7 +65,7 @@ test("if url contains a hash during redirection a page reload happens", async ()
   const mockUrlWithHash = "https://path/to/email/url#foo-bar-baz"
 
   server.use(
-    rest.post("/api/auth/signout", (req, res, ctx) => {
+    rest.post("http://localhost/api/auth/signout", (req, res, ctx) => {
       return res(
         ctx.status(200),
         ctx.json({
@@ -85,8 +81,7 @@ test("if url contains a hash during redirection a page reload happens", async ()
   userEvent.click(screen.getByRole("button"))
 
   await waitFor(() => {
-    expect(window.location.reload).toHaveBeenCalledTimes(1)
-    expect(window.location.replace).toHaveBeenCalledWith(mockUrlWithHash)
+    expect(window.location.href).toBe(mockUrlWithHash)
   })
 })
 

src/client/__tests__/use-session-hook.test.js

@@ -0,0 +1,140 @@
+import { rest } from "msw"
+import { renderHook } from "@testing-library/react-hooks"
+import { render, waitFor } from "@testing-library/react"
+import { SessionProvider, useSession, signOut } from "../../react"
+import { server, mockSession } from "./helpers/mocks"
+
+const origConsoleError = console.error
+const { location } = window
+
+let _href = window.location.href
+beforeAll(() => {
+  // Prevent noise on the terminal... `next-auth` will log to `console.error`
+  // every time a request fails, which makes the tests output very noisy...
+  console.error = jest.fn()
+
+  // Allows to mutate `window.location`...
+  delete window.location
+  window.location = {}
+  Object.defineProperty(window.location, "href", {
+    get: () => _href,
+    // whatwg-fetch or whatwg-url does not seem to work with relative URLs
+    set: (href) => {
+      _href = href.startsWith("/") ? `http://localhost${href}` : href
+      return _href
+    },
+  })
+
+  server.listen()
+})
+
+afterEach(() => {
+  server.resetHandlers()
+  _href = "http://localhost/"
+
+  // clear the internal session cache...
+  signOut({ redirect: false })
+})
+
+afterAll(() => {
+  console.error = origConsoleError
+  window.location = location
+  server.close()
+})
+
+test("it won't allow to fetch the session in isolation without a session context", () => {
+  function App() {
+    useSession()
+    return null
+  }
+
+  expect(() => render(<App />)).toThrow(
+    "[next-auth]: `useSession` must be wrapped in a <SessionProvider />"
+  )
+})
+
+test("when fetching the session, there won't be `data` and `status` will be 'loading'", () => {
+  const { result } = renderHook(() => useSession(), {
+    wrapper: SessionProvider,
+  })
+
+  expect(result.current.data).toBe(undefined)
+  expect(result.current.status).toBe("loading")
+})
+
+test("when session is fetched, `data` will contain the session data and `status` will be 'authenticated'", async () => {
+  const { result } = renderHook(() => useSession(), {
+    wrapper: SessionProvider,
+  })
+
+  await waitFor(() => {
+    expect(result.current.data).toEqual(mockSession)
+    expect(result.current.status).toBe("authenticated")
+  })
+})
+
+test("when it fails to fetch the session, `data` will be null and `status` will be 'unauthenticated'", async () => {
+  server.use(
+    rest.get(`http://localhost/api/auth/session`, (_, res, ctx) =>
+      res(ctx.status(401), ctx.json({}))
+    )
+  )
+
+  const { result } = renderHook(() => useSession(), {
+    wrapper: SessionProvider,
+  })
+
+  return waitFor(() => {
+    expect(result.current.data).toEqual(null)
+    expect(result.current.status).toBe("unauthenticated")
+  })
+})
+
+test("it'll redirect to sign-in page if the session is required and the user is not authenticated", async () => {
+  server.use(
+    rest.get(`http://localhost/api/auth/session`, (req, res, ctx) =>
+      res(ctx.status(401), ctx.json({}))
+    )
+  )
+
+  const callbackUrl = window.location.href
+  const { result } = renderHook(() => useSession({ required: true }), {
+    wrapper: SessionProvider,
+  })
+
+  await waitFor(() => {
+    expect(result.current.data).toEqual(null)
+    expect(result.current.status).toBe("loading")
+  })
+
+  expect(window.location.href).toBe(
+    `http://localhost/api/auth/signin?${new URLSearchParams({
+      error: "SessionRequired",
+      callbackUrl,
+    })}`
+  )
+})
+
+test("will call custom redirect logic if supplied when the user could not authenticate", async () => {
+  server.use(
+    rest.get(`http://localhost/api/auth/session`, (_, res, ctx) =>
+      res(ctx.status(401), ctx.json({}))
+    )
+  )
+
+  const customRedirect = jest.fn()
+
+  const { result } = renderHook(
+    () => useSession({ required: true, onUnauthenticated: customRedirect }),
+    {
+      wrapper: SessionProvider,
+    }
+  )
+
+  await waitFor(() => {
+    expect(result.current.data).toEqual(null)
+    expect(result.current.status).toBe("loading")
+  })
+
+  expect(customRedirect).toHaveBeenCalledTimes(1)
+})

src/client/_utils.ts

@@ -0,0 +1,106 @@
+import type { IncomingMessage } from "http"
+import type { LoggerInstance, Session } from ".."
+
+export interface NextAuthClientConfig {
+  baseUrl: string
+  basePath: string
+  baseUrlServer: string
+  basePathServer: string
+  /** Stores last session response */
+  _session?: Session | null | undefined
+  /** Used for timestamp since last sycned (in seconds) */
+  _lastSync: number
+  /**
+   * Stores the `SessionProvider`'s session update method to be able to
+   * trigger session updates from places like `signIn` or `signOut`
+   */
+  _getSession: (...args: any[]) => any
+}
+
+export interface CtxOrReq {
+  req?: IncomingMessage
+  ctx?: { req: IncomingMessage }
+}
+
+/**
+ * If passed 'appContext' via getInitialProps() in _app.js
+ * then get the req object from ctx and use that for the
+ * req value to allow `fetchData` to
+ * work seemlessly in getInitialProps() on server side
+ * pages *and* in _app.js.
+ */
+export async function fetchData<T = any>(
+  path: string,
+  __NEXTAUTH: NextAuthClientConfig,
+  logger: LoggerInstance,
+  { ctx, req = ctx?.req }: CtxOrReq = {}
+): Promise<T | null> {
+  try {
+    const options = req?.headers.cookie
+      ? { headers: { cookie: req.headers.cookie } }
+      : {}
+    const res = await fetch(`${apiBaseUrl(__NEXTAUTH)}/${path}`, options)
+    const data = await res.json()
+    if (!res.ok) throw data
+    return Object.keys(data).length > 0 ? data : null // Return null if data empty
+  } catch (error) {
+    logger.error("CLIENT_FETCH_ERROR", {
+      error: error as Error,
+      path,
+      ...(req ? { header: req.headers } : {}),
+    })
+    return null
+  }
+}
+
+export function apiBaseUrl(__NEXTAUTH: NextAuthClientConfig) {
+  if (typeof window === "undefined") {
+    // Return absolute path when called server side
+    return `${__NEXTAUTH.baseUrlServer}${__NEXTAUTH.basePathServer}`
+  }
+  // Return relative path when called client side
+  return __NEXTAUTH.basePath
+}
+
+/** Returns the number of seconds elapsed since January 1, 1970 00:00:00 UTC. */
+export function now() {
+  return Math.floor(Date.now() / 1000)
+}
+
+export interface BroadcastMessage {
+  event?: "session"
+  data?: { trigger?: "signout" | "getSession" }
+  clientId: string
+  timestamp: number
+}
+
+/**
+ * Inspired by [Broadcast Channel API](https://developer.mozilla.org/en-US/docs/Web/API/Broadcast_Channel_API)
+ * Only not using it directly, because Safari does not support it.
+ *
+ * https://caniuse.com/?search=broadcastchannel
+ */
+export function BroadcastChannel(name = "nextauth.message") {
+  return {
+    /** Get notified by other tabs/windows. */
+    receive(onReceive: (message: BroadcastMessage) => void) {
+      const handler = (event: StorageEvent) => {
+        if (event.key !== name) return
+        const message: BroadcastMessage = JSON.parse(event.newValue ?? "{}")
+        if (message?.event !== "session" || !message?.data) return
+
+        onReceive(message)
+      }
+      window.addEventListener("storage", handler)
+      return () => window.removeEventListener("storage", handler)
+    },
+    /** Notify other tabs/windows. */
+    post(message: Record<string, unknown>) {
+      if (typeof window === "undefined") return
+      localStorage.setItem(
+        name,
+        JSON.stringify({ ...message, timestamp: now() })
+      )
+    },
+  }
+}

src/client/index.js

@@ -1,418 +0,0 @@
-// Note about signIn() and signOut() methods:
-//
-// On signIn() and signOut() we pass 'json: true' to request a response in JSON
-// instead of HTTP as redirect URLs on other domains are not returned to
-// requests made using the fetch API in the browser, and we need to ask the API
-// to return the response as a JSON object (the end point still defaults to
-// returning an HTTP response with a redirect for non-JavaScript clients).
-//
-// We use HTTP POST requests with CSRF Tokens to protect against CSRF attacks.
-
-import {
-  useState,
-  useEffect,
-  useContext,
-  createContext,
-  createElement,
-} from "react"
-import _logger, { proxyLogger } from "../lib/logger"
-import parseUrl from "../lib/parse-url"
-
-// This behaviour mirrors the default behaviour for getting the site name that
-// happens server side in server/index.js
-// 1. An empty value is legitimate when the code is being invoked client side as
-//    relative URLs are valid in that context and so defaults to empty.
-// 2. When invoked server side the value is picked up from an environment
-//    variable and defaults to 'http://localhost:3000'.
-/** @type {import("types/internals/client").NextAuthConfig} */
-const __NEXTAUTH = {
-  baseUrl: parseUrl(process.env.NEXTAUTH_URL || process.env.VERCEL_URL).baseUrl,
-  basePath: parseUrl(process.env.NEXTAUTH_URL).basePath,
-  baseUrlServer: parseUrl(
-    process.env.NEXTAUTH_URL_INTERNAL ||
-      process.env.NEXTAUTH_URL ||
-      process.env.VERCEL_URL
-  ).baseUrl,
-  basePathServer: parseUrl(
-    process.env.NEXTAUTH_URL_INTERNAL || process.env.NEXTAUTH_URL
-  ).basePath,
-  keepAlive: 0,
-  clientMaxAge: 0,
-  // Properties starting with _ are used for tracking internal app state
-  _clientLastSync: 0,
-  _clientSyncTimer: null,
-  _eventListenersAdded: false,
-  _clientSession: undefined,
-  _getSession: () => {},
-}
-
-const logger = proxyLogger(_logger, __NEXTAUTH.basePath)
-
-const broadcast = BroadcastChannel()
-
-// Add event listners on load
-if (typeof window !== "undefined" && !__NEXTAUTH._eventListenersAdded) {
-  __NEXTAUTH._eventListenersAdded = true
-  // Listen for storage events and update session if event fired from
-  // another window (but suppress firing another event to avoid a loop)
-  // Fetch new session data but tell it to not to fire another event to
-  // avoid an infinite loop.
-  // Note: We could pass session data through and do something like
-  // `setData(message.data)` but that can cause problems depending
-  // on how the session object is being used in the client; it is
-  // more robust to have each window/tab fetch it's own copy of the
-  // session object rather than share it across instances.
-  broadcast.receive(() => __NEXTAUTH._getSession({ event: "storage" }))
-
-  // Listen for document visibility change events and
-  // if visibility of the document changes, re-fetch the session.
-  document.addEventListener(
-    "visibilitychange",
-    () => {
-      !document.hidden && __NEXTAUTH._getSession({ event: "visibilitychange" })
-    },
-    false
-  )
-}
-
-// Context to store session data globally
-/** @type {import("types/internals/client").SessionContext} */
-const SessionContext = createContext()
-
-export function useSession(session) {
-  const context = useContext(SessionContext)
-  if (context) return context
-  return _useSessionHook(session)
-}
-
-function _useSessionHook(session) {
-  const [data, setData] = useState(session)
-  const [loading, setLoading] = useState(!data)
-
-  useEffect(() => {
-    __NEXTAUTH._getSession = async ({ event = null } = {}) => {
-      try {
-        const triggredByEvent = event !== null
-        const triggeredByStorageEvent = event === "storage"
-
-        const clientMaxAge = __NEXTAUTH.clientMaxAge
-        const clientLastSync = parseInt(__NEXTAUTH._clientLastSync)
-        const currentTime = _now()
-        const clientSession = __NEXTAUTH._clientSession
-
-        // Updates triggered by a storage event *always* trigger an update and we
-        // always update if we don't have any value for the current session state.
-        if (!triggeredByStorageEvent && clientSession !== undefined) {
-          if (clientMaxAge === 0 && triggredByEvent !== true) {
-            // If there is no time defined for when a session should be considered
-            // stale, then it's okay to use the value we have until an event is
-            // triggered which updates it.
-            return
-          } else if (clientMaxAge > 0 && clientSession === null) {
-            // If the client doesn't have a session then we don't need to call
-            // the server to check if it does (if they have signed in via another
-            // tab or window that will come through as a triggeredByStorageEvent
-            // event and will skip this logic)
-            return
-          } else if (
-            clientMaxAge > 0 &&
-            currentTime < clientLastSync + clientMaxAge
-          ) {
-            // If the session freshness is within clientMaxAge then don't request
-            // it again on this call (avoids too many invokations).
-            return
-          }
-        }
-
-        if (clientSession === undefined) {
-          __NEXTAUTH._clientSession = null
-        }
-
-        // Update clientLastSync before making response to avoid repeated
-        // invokations that would otherwise be triggered while we are still
-        // waiting for a response.
-        __NEXTAUTH._clientLastSync = _now()
-
-        // If this call was invoked via a storage event (i.e. another window) then
-        // tell getSession not to trigger an event when it calls to avoid an
-        // infinate loop.
-        const newClientSessionData = await getSession({
-          triggerEvent: !triggeredByStorageEvent,
-        })
-
-        // Save session state internally, just so we can track that we've checked
-        // if a session exists at least once.
-        __NEXTAUTH._clientSession = newClientSessionData
-
-        setData(newClientSessionData)
-        setLoading(false)
-      } catch (error) {
-        logger.error("CLIENT_USE_SESSION_ERROR", error)
-        setLoading(false)
-      }
-    }
-
-    __NEXTAUTH._getSession()
-  })
-
-  return [data, loading]
-}
-
-export async function getSession(ctx) {
-  const session = await _fetchData("session", ctx)
-  if (ctx?.triggerEvent ?? true) {
-    broadcast.post({ event: "session", data: { trigger: "getSession" } })
-  }
-  return session
-}
-
-export async function getCsrfToken(ctx) {
-  return (await _fetchData("csrf", ctx))?.csrfToken
-}
-
-export async function getProviders() {
-  return await _fetchData("providers")
-}
-
-export async function signIn(provider, options = {}, authorizationParams = {}) {
-  const { callbackUrl = window.location.href, redirect = true } = options
-
-  const baseUrl = _apiBaseUrl()
-  const providers = await getProviders()
-
-  if (!providers) {
-    return window.location.replace(`${baseUrl}/error`)
-  }
-
-  if (!(provider in providers)) {
-    return window.location.replace(
-      `${baseUrl}/signin?callbackUrl=${encodeURIComponent(callbackUrl)}`
-    )
-  }
-
-  const isCredentials = providers[provider].type === "credentials"
-  const isEmail = providers[provider].type === "email"
-  const isSupportingReturn = isCredentials || isEmail
-
-  const signInUrl = isCredentials
-    ? `${baseUrl}/callback/${provider}`
-    : `${baseUrl}/signin/${provider}`
-
-  const _signInUrl = `${signInUrl}?${new URLSearchParams(authorizationParams)}`
-
-  const res = await fetch(_signInUrl, {
-    method: "post",
-    headers: {
-      "Content-Type": "application/x-www-form-urlencoded",
-    },
-    body: new URLSearchParams({
-      ...options,
-      csrfToken: await getCsrfToken(),
-      callbackUrl,
-      json: true,
-    }),
-  })
-
-  const data = await res.json()
-
-  if (redirect || !isSupportingReturn) {
-    const url = data.url ?? callbackUrl
-    window.location.replace(url)
-    // If url contains a hash, the browser does not reload the page. We reload manually
-    if (url.includes("#")) window.location.reload()
-    return
-  }
-
-  const error = new URL(data.url).searchParams.get("error")
-
-  if (res.ok) {
-    await __NEXTAUTH._getSession({ event: "storage" })
-  }
-
-  return {
-    error,
-    status: res.status,
-    ok: res.ok,
-    url: error ? null : data.url,
-  }
-}
-
-export async function signOut(options = {}) {
-  const { callbackUrl = window.location.href, redirect = true } = options
-  const baseUrl = _apiBaseUrl()
-  const fetchOptions = {
-    method: "post",
-    headers: {
-      "Content-Type": "application/x-www-form-urlencoded",
-    },
-    body: new URLSearchParams({
-      csrfToken: await getCsrfToken(),
-      callbackUrl,
-      json: true,
-    }),
-  }
-  const res = await fetch(`${baseUrl}/signout`, fetchOptions)
-  const data = await res.json()
-  broadcast.post({ event: "session", data: { trigger: "signout" } })
-
-  if (redirect) {
-    const url = data.url ?? callbackUrl
-    window.location.replace(url)
-    // If url contains a hash, the browser does not reload the page. We reload manually
-    if (url.includes("#")) window.location.reload()
-    return
-  }
-
-  await __NEXTAUTH._getSession({ event: "storage" })
-
-  return data
-}
-
-// Method to set options. The documented way is to use the provider, but this
-// method is being left in as an alternative, that will be helpful if/when we
-// expose a vanilla JavaScript version that doesn't depend on React.
-export function setOptions({
-  baseUrl,
-  basePath,
-  clientMaxAge,
-  keepAlive,
-} = {}) {
-  if (baseUrl) __NEXTAUTH.baseUrl = baseUrl
-  if (basePath) __NEXTAUTH.basePath = basePath
-  if (clientMaxAge) __NEXTAUTH.clientMaxAge = clientMaxAge
-  if (keepAlive) {
-    __NEXTAUTH.keepAlive = keepAlive
-    if (typeof window === "undefined") return
-
-    // Clear existing timer (if there is one)
-    if (__NEXTAUTH._clientSyncTimer !== null) {
-      clearTimeout(__NEXTAUTH._clientSyncTimer)
-    }
-
-    // Set next timer to trigger in number of seconds
-    __NEXTAUTH._clientSyncTimer = setTimeout(async () => {
-      // Only invoke keepalive when a session exists
-      if (!__NEXTAUTH._clientSession) return
-      await __NEXTAUTH._getSession({ event: "timer" })
-    }, keepAlive * 1000)
-  }
-}
-
-export function Provider({ children, session, options }) {
-  setOptions(options)
-  return createElement(
-    SessionContext.Provider,
-    { value: useSession(session) },
-    children
-  )
-}
-
-/**
- * If passed 'appContext' via getInitialProps() in _app.js
- * then get the req object from ctx and use that for the
- * req value to allow _fetchData to
- * work seemlessly in getInitialProps() on server side
- * pages *and* in _app.js.
- */
-async function _fetchData(path, { ctx, req = ctx?.req } = {}) {
-  try {
-    const baseUrl = await _apiBaseUrl()
-    const options = req ? { headers: { cookie: req.headers.cookie } } : {}
-    const res = await fetch(`${baseUrl}/${path}`, options)
-    const data = await res.json()
-    if (!res.ok) throw data
-    return Object.keys(data).length > 0 ? data : null // Return null if data empty
-  } catch (error) {
-    logger.error("CLIENT_FETCH_ERROR", path, error)
-    return null
-  }
-}
-
-function _apiBaseUrl() {
-  if (typeof window === "undefined") {
-    // NEXTAUTH_URL should always be set explicitly to support server side calls - log warning if not set
-    if (!process.env.NEXTAUTH_URL) {
-      logger.warn("NEXTAUTH_URL", "NEXTAUTH_URL environment variable not set")
-    }
-
-    // Return absolute path when called server side
-    return `${__NEXTAUTH.baseUrlServer}${__NEXTAUTH.basePathServer}`
-  }
-  // Return relative path when called client side
-  return __NEXTAUTH.basePath
-}
-
-/** Returns the number of seconds elapsed since January 1, 1970 00:00:00 UTC. */
-function _now() {
-  return Math.floor(Date.now() / 1000)
-}
-
-/**
- * Inspired by [Broadcast Channel API](https://developer.mozilla.org/en-US/docs/Web/API/Broadcast_Channel_API)
- * Only not using it directly, because Safari does not support it.
- *
- * https://caniuse.com/?search=broadcastchannel
- */
-function BroadcastChannel(name = "nextauth.message") {
-  return {
-    /**
-     * Get notified by other tabs/windows.
-     * @param {(message: import("types/internals/client").BroadcastMessage) => void} onReceive
-     */
-    receive(onReceive) {
-      if (typeof window === "undefined") return
-      window.addEventListener("storage", async (event) => {
-        if (event.key !== name) return
-        /** @type {import("types/internals/client").BroadcastMessage} */
-        const message = JSON.parse(event.newValue)
-        if (message?.event !== "session" || !message?.data) return
-
-        onReceive(message)
-      })
-    },
-    /** Notify other tabs/windows. */
-    post(message) {
-      if (typeof localStorage === "undefined") return
-      localStorage.setItem(
-        name,
-        JSON.stringify({ ...message, timestamp: _now() })
-      )
-    },
-  }
-}
-
-// Some methods are exported with more than one name. This provides some
-// flexibility over how they can be invoked and backwards compatibility
-// with earlier releases. These should be removed in a newer release, as it only
-// creates problems for bundlers and adds confusion to users. TypeScript declarations
-// will provide sufficient help when importing
-export {
-  setOptions as options,
-  getSession as session,
-  getProviders as providers,
-  getCsrfToken as csrfToken,
-  signIn as signin,
-  signOut as signout,
-}
-
-export default {
-  getSession,
-  getCsrfToken,
-  getProviders,
-  useSession,
-  signIn,
-  signOut,
-  Provider,
-  /* Deprecated / unsupported features below this line */
-  // Use setOptions() set options globally in the app.
-  setOptions,
-  // Some methods are exported with more than one name. This provides some
-  // flexibility over how they can be invoked and backwards compatibility
-  // with earlier releases.
-  options: setOptions,
-  session: getSession,
-  providers: getProviders,
-  csrfToken: getCsrfToken,
-  signin: signIn,
-  signout: signOut,
-}

src/core/errors.ts

@@ -0,0 +1,118 @@
+import type { EventCallbacks, LoggerInstance } from ".."
+import type { Adapter } from "../adapters"
+
+/**
+ * Same as the default `Error`, but it is JSON serializable.
+ * @source https://iaincollins.medium.com/error-handling-in-javascript-a6172ccdf9af
+ */
+export class UnknownError extends Error {
+  code: string
+  constructor(error: Error | string) {
+    // Support passing error or string
+    super((error as Error)?.message ?? error)
+    this.name = "UnknownError"
+    this.code = (error as any).code
+    if (error instanceof Error) {
+      this.stack = error.stack
+    }
+  }
+
+  toJSON() {
+    return {
+      name: this.name,
+      message: this.message,
+      stack: this.stack,
+    }
+  }
+}
+
+export class OAuthCallbackError extends UnknownError {
+  name = "OAuthCallbackError"
+}
+
+/**
+ * Thrown when an Email address is already associated with an account
+ * but the user is trying an OAuth account that is not linked to it.
+ */
+export class AccountNotLinkedError extends UnknownError {
+  name = "AccountNotLinkedError"
+}
+
+export class MissingAPIRoute extends UnknownError {
+  name = "MissingAPIRouteError"
+  code = "MISSING_NEXTAUTH_API_ROUTE_ERROR"
+}
+
+export class MissingSecret extends UnknownError {
+  name = "MissingSecretError"
+  code = "NO_SECRET"
+}
+
+export class MissingAuthorize extends UnknownError {
+  name = "MissingAuthorizeError"
+  code = "CALLBACK_CREDENTIALS_HANDLER_ERROR"
+}
+
+export class MissingAdapter extends UnknownError {
+  name = "MissingAdapterError"
+  code = "EMAIL_REQUIRES_ADAPTER_ERROR"
+}
+
+export class UnsupportedStrategy extends UnknownError {
+  name = "UnsupportedStrategyError"
+  code = "CALLBACK_CREDENTIALS_JWT_ERROR"
+}
+
+type Method = (...args: any[]) => Promise<any>
+
+export function upperSnake(s: string) {
+  return s.replace(/([A-Z])/g, "_$1").toUpperCase()
+}
+
+export function capitalize(s: string) {
+  return `${s[0].toUpperCase()}${s.slice(1)}`
+}
+
+/**
+ * Wraps an object of methods and adds error handling.
+ */
+export function eventsErrorHandler(
+  methods: Partial<EventCallbacks>,
+  logger: LoggerInstance
+): Partial<EventCallbacks> {
+  return Object.keys(methods).reduce<any>((acc, name) => {
+    acc[name] = async (...args: any[]) => {
+      try {
+        const method: Method = methods[name as keyof Method]
+        return await method(...args)
+      } catch (e) {
+        logger.error(`${upperSnake(name)}_EVENT_ERROR`, e as Error)
+      }
+    }
+    return acc
+  }, {})
+}
+
+/** Handles adapter induced errors. */
+export function adapterErrorHandler(
+  adapter: Adapter | undefined,
+  logger: LoggerInstance
+): Adapter | undefined {
+  if (!adapter) return
+
+  return Object.keys(adapter).reduce<any>((acc, name) => {
+    acc[name] = async (...args: any[]) => {
+      try {
+        logger.debug(`adapter_${name}`, { args })
+        const method: Method = adapter[name as keyof Method]
+        return await method(...args)
+      } catch (error) {
+        logger.error(`adapter_error_${name}`, error as Error)
+        const e = new UnknownError(error as Error)
+        e.name = `${capitalize(name)}Error`
+        throw e
+      }
+    }
+    return acc
+  }, {})
+}

src/core/index.ts

@@ -0,0 +1,233 @@
+import logger, { setLogger } from "../lib/logger"
+import * as routes from "./routes"
+import renderPage from "./pages"
+import { init } from "./init"
+import { assertConfig } from "./lib/assert"
+import { SessionStore } from "./lib/cookie"
+
+import type { NextAuthOptions } from "./types"
+import type { NextAuthAction } from "../lib/types"
+import type { Cookie } from "./lib/cookie"
+import type { ErrorType } from "./pages/error"
+
+export interface IncomingRequest {
+  /** @default "http://localhost:3000" */
+  host: string
+  method?: string
+  cookies?: Record<string, string>
+  headers?: Record<string, any>
+  query?: Record<string, any>
+  body?: Record<string, any>
+  action: NextAuthAction
+  providerId?: string
+  error?: string
+}
+
+export interface NextAuthHeader {
+  key: string
+  value: string
+}
+
+export interface OutgoingResponse<
+  Body extends string | Record<string, any> | any[] = any
+> {
+  status?: number
+  headers?: NextAuthHeader[]
+  body?: Body
+  redirect?: string
+  cookies?: Cookie[]
+}
+
+export interface NextAuthHandlerParams {
+  req: IncomingRequest
+  options: NextAuthOptions
+}
+
+export async function NextAuthHandler<
+  Body extends string | Record<string, any> | any[]
+>(params: NextAuthHandlerParams): Promise<OutgoingResponse<Body>> {
+  const { options: userOptions, req } = params
+
+  setLogger(userOptions.logger, userOptions.debug)
+
+  const assertionResult = assertConfig(params)
+
+  if (typeof assertionResult === "string") {
+    logger.warn(assertionResult)
+  } else if (assertionResult instanceof Error) {
+    // Bail out early if there's an error in the user config
+    const { pages, theme } = userOptions
+    logger.error(assertionResult.code, assertionResult)
+    if (pages?.error) {
+      return {
+        redirect: `${pages.error}?error=Configuration`,
+      }
+    }
+    const render = renderPage({ theme })
+    return render.error({ error: "configuration" })
+  }
+
+  const { action, providerId, error, method = "GET" } = req
+
+  const { options, cookies } = await init({
+    userOptions,
+    action,
+    providerId,
+    host: req.host,
+    callbackUrl: req.body?.callbackUrl ?? req.query?.callbackUrl,
+    csrfToken: req.body?.csrfToken,
+    cookies: req.cookies,
+    isPost: method === "POST",
+  })
+
+  const sessionStore = new SessionStore(
+    options.cookies.sessionToken,
+    req,
+    options.logger
+  )
+
+  if (method === "GET") {
+    const render = renderPage({ ...options, query: req.query, cookies })
+    const { pages } = options
+    switch (action) {
+      case "providers":
+        return (await routes.providers(options.providers)) as any
+      case "session":
+        return (await routes.session({ options, sessionStore })) as any
+      case "csrf":
+        return {
+          headers: [{ key: "Content-Type", value: "application/json" }],
+          body: { csrfToken: options.csrfToken } as any,
+          cookies,
+        }
+      case "signin":
+        if (pages.signIn) {
+          let signinUrl = `${pages.signIn}${
+            pages.signIn.includes("?") ? "&" : "?"
+          }callbackUrl=${options.callbackUrl}`
+          if (error) signinUrl = `${signinUrl}&error=${error}`
+          return { redirect: signinUrl, cookies }
+        }
+
+        return render.signin()
+      case "signout":
+        if (pages.signOut) return { redirect: pages.signOut, cookies }
+
+        return render.signout()
+      case "callback":
+        if (options.provider) {
+          const callback = await routes.callback({
+            body: req.body,
+            query: req.query,
+            headers: req.headers,
+            cookies: req.cookies,
+            method,
+            options,
+            sessionStore,
+          })
+          if (callback.cookies) cookies.push(...callback.cookies)
+          return { ...callback, cookies }
+        }
+        break
+      case "verify-request":
+        if (pages.verifyRequest) {
+          return { redirect: pages.verifyRequest, cookies }
+        }
+        return render.verifyRequest()
+      case "error":
+        if (pages.error) {
+          return {
+            redirect: `${pages.error}${
+              pages.error.includes("?") ? "&" : "?"
+            }error=${error}`,
+            cookies,
+          }
+        }
+
+        // These error messages are displayed in line on the sign in page
+        if (
+          [
+            "Signin",
+            "OAuthSignin",
+            "OAuthCallback",
+            "OAuthCreateAccount",
+            "EmailCreateAccount",
+            "Callback",
+            "OAuthAccountNotLinked",
+            "EmailSignin",
+            "CredentialsSignin",
+            "SessionRequired",
+          ].includes(error as string)
+        ) {
+          return { redirect: `${options.url}/signin?error=${error}`, cookies }
+        }
+
+        return render.error({ error: error as ErrorType })
+      default:
+    }
+  } else if (method === "POST") {
+    switch (action) {
+      case "signin":
+        // Verified CSRF Token required for all sign in routes
+        if (options.csrfTokenVerified && options.provider) {
+          const signin = await routes.signin({
+            query: req.query,
+            body: req.body,
+            options,
+          })
+          if (signin.cookies) cookies.push(...signin.cookies)
+          return { ...signin, cookies }
+        }
+
+        return { redirect: `${options.url}/signin?csrf=true`, cookies }
+      case "signout":
+        // Verified CSRF Token required for signout
+        if (options.csrfTokenVerified) {
+          const signout = await routes.signout({ options, sessionStore })
+          if (signout.cookies) cookies.push(...signout.cookies)
+          return { ...signout, cookies }
+        }
+        return { redirect: `${options.url}/signout?csrf=true`, cookies }
+      case "callback":
+        if (options.provider) {
+          // Verified CSRF Token required for credentials providers only
+          if (
+            options.provider.type === "credentials" &&
+            !options.csrfTokenVerified
+          ) {
+            return { redirect: `${options.url}/signin?csrf=true`, cookies }
+          }
+
+          const callback = await routes.callback({
+            body: req.body,
+            query: req.query,
+            headers: req.headers,
+            cookies: req.cookies,
+            method,
+            options,
+            sessionStore,
+          })
+          if (callback.cookies) cookies.push(...callback.cookies)
+          return { ...callback, cookies }
+        }
+        break
+      case "_log":
+        if (userOptions.logger) {
+          try {
+            const { code, level, ...metadata } = req.body ?? {}
+            logger[level](code, metadata)
+          } catch (error) {
+            // If logging itself failed...
+            logger.error("LOGGER_ERROR", error as Error)
+          }
+        }
+        return {}
+      default:
+    }
+  }
+
+  return {
+    status: 400,
+    body: `Error: Action ${action} with HTTP ${method} is not supported by NextAuth.js` as any,
+  }
+}

src/core/init.ts

@@ -0,0 +1,147 @@
+import { NextAuthOptions } from ".."
+import logger from "../lib/logger"
+import parseUrl from "../lib/parse-url"
+import { InternalOptions } from "../lib/types"
+import { adapterErrorHandler, eventsErrorHandler } from "./errors"
+import parseProviders from "./lib/providers"
+import createSecret from "./lib/utils"
+import * as cookie from "./lib/cookie"
+import * as jwt from "../jwt"
+import { defaultCallbacks } from "./lib/default-callbacks"
+import { createCSRFToken } from "./lib/csrf-token"
+import { createCallbackUrl } from "./lib/callback-url"
+import { IncomingRequest } from "."
+
+interface InitParams {
+  host?: string
+  userOptions: NextAuthOptions
+  providerId?: string
+  action: InternalOptions["action"]
+  /** Callback URL value extracted from the incoming request. */
+  callbackUrl?: string
+  /** CSRF token value extracted from the incoming request. From body if POST, from query if GET */
+  csrfToken?: string
+  /** Is the incoming request a POST request? */
+  isPost: boolean
+  cookies: IncomingRequest["cookies"]
+}
+
+/** Initialize all internal options and cookies. */
+export async function init({
+  userOptions,
+  providerId,
+  action,
+  host,
+  cookies: reqCookies,
+  callbackUrl: reqCallbackUrl,
+  csrfToken: reqCsrfToken,
+  isPost,
+}: InitParams): Promise<{
+  options: InternalOptions
+  cookies: cookie.Cookie[]
+}> {
+  const url = parseUrl(host)
+
+  const secret = createSecret({ userOptions, url })
+
+  const { providers, provider } = parseProviders({
+    providers: userOptions.providers,
+    url,
+    providerId,
+  })
+
+  const maxAge = 30 * 24 * 60 * 60 // Sessions expire after 30 days of being idle by default
+
+  // User provided options are overriden by other options,
+  // except for the options with special handling above
+  const options: InternalOptions = {
+    debug: false,
+    pages: {},
+    theme: {
+      colorScheme: "auto",
+      logo: "",
+      brandColor: "",
+    },
+    // Custom options override defaults
+    ...userOptions,
+    // These computed settings can have values in userOptions but we override them
+    // and are request-specific.
+    url,
+    action,
+    provider,
+    cookies: {
+      ...cookie.defaultCookies(
+        userOptions.useSecureCookies ?? url.base.startsWith("https://")
+      ),
+      // Allow user cookie options to override any cookie settings above
+      ...userOptions.cookies,
+    },
+    secret,
+    providers,
+    // Session options
+    session: {
+      // If no adapter specified, force use of JSON Web Tokens (stateless)
+      strategy: userOptions.adapter ? "database" : "jwt",
+      maxAge,
+      updateAge: 24 * 60 * 60,
+      ...userOptions.session,
+    },
+    // JWT options
+    jwt: {
+      secret, // Use application secret if no keys specified
+      maxAge, // same as session maxAge,
+      encode: jwt.encode,
+      decode: jwt.decode,
+      ...userOptions.jwt,
+    },
+    // Event messages
+    events: eventsErrorHandler(userOptions.events ?? {}, logger),
+    adapter: adapterErrorHandler(userOptions.adapter, logger),
+    // Callback functions
+    callbacks: { ...defaultCallbacks, ...userOptions.callbacks },
+    logger,
+    callbackUrl: process.env.NEXTAUTH_URL ?? "http://localhost:3000",
+  }
+
+  // Init cookies
+
+  const cookies: cookie.Cookie[] = []
+
+  const {
+    csrfToken,
+    cookie: csrfCookie,
+    csrfTokenVerified,
+  } = createCSRFToken({
+    options,
+    cookieValue: reqCookies?.[options.cookies.csrfToken.name],
+    isPost,
+    bodyValue: reqCsrfToken,
+  })
+
+  options.csrfToken = csrfToken
+  options.csrfTokenVerified = csrfTokenVerified
+
+  if (csrfCookie) {
+    cookies.push({
+      name: options.cookies.csrfToken.name,
+      value: csrfCookie,
+      options: options.cookies.csrfToken.options,
+    })
+  }
+
+  const { callbackUrl, callbackUrlCookie } = await createCallbackUrl({
+    options,
+    cookieValue: reqCookies?.[options.cookies.callbackUrl.name],
+    paramValue: reqCallbackUrl,
+  })
+  options.callbackUrl = callbackUrl
+  if (callbackUrlCookie) {
+    cookies.push({
+      name: options.cookies.callbackUrl.name,
+      value: callbackUrlCookie,
+      options: options.cookies.callbackUrl.options,
+    })
+  }
+
+  return { options, cookies }
+}

src/core/lib/assert.ts

@@ -0,0 +1,78 @@
+import {
+  MissingAdapter,
+  MissingAPIRoute,
+  MissingAuthorize,
+  MissingSecret,
+  UnsupportedStrategy,
+} from "../errors"
+
+import type { NextAuthHandlerParams } from ".."
+import type { WarningCode } from "../../lib/logger"
+
+type ConfigError =
+  | MissingAPIRoute
+  | MissingSecret
+  | UnsupportedStrategy
+  | MissingAuthorize
+  | MissingAdapter
+
+/**
+ * Verify that the user configured `next-auth` correctly.
+ * Good place to mention deprecations as well.
+ *
+ * REVIEW: Make some of these and corresponding docs less Next.js specific?
+ */
+export function assertConfig(
+  params: NextAuthHandlerParams
+): ConfigError | WarningCode | undefined {
+  const { options, req } = params
+
+  // req.query isn't defined when asserting `getServerSession` for example
+  if (!req.query?.nextauth && !req.action) {
+    return new MissingAPIRoute(
+      "Cannot find [...nextauth].{js,ts} in `/pages/api/auth`. Make sure the filename is written correctly."
+    )
+  }
+
+  if (!options.secret) {
+    if (process.env.NODE_ENV === "production") {
+      return new MissingSecret("Please define a `secret` in production.")
+    } else {
+      return "NO_SECRET"
+    }
+  }
+
+  if (!req.host) return "NEXTAUTH_URL"
+
+  let hasCredentials, hasEmail
+
+  options.providers.forEach(({ type }) => {
+    if (type === "credentials") hasCredentials = true
+    else if (type === "email") hasEmail = true
+  })
+
+  if (hasCredentials) {
+    const dbStrategy = options.session?.strategy === "database"
+    const onlyCredentials = !options.providers.some(
+      (p) => p.type !== "credentials"
+    )
+    if (dbStrategy && onlyCredentials) {
+      return new UnsupportedStrategy(
+        "Signin in with credentials only supported if JWT strategy is enabled"
+      )
+    }
+
+    const credentialsNoAuthorize = options.providers.some(
+      (p) => p.type === "credentials" && !p.authorize
+    )
+    if (credentialsNoAuthorize) {
+      return new MissingAuthorize(
+        "Must define an authorize() handler to use credentials authentication provider"
+      )
+    }
+  }
+
+  if (hasEmail && !options.adapter) {
+    return new MissingAdapter("E-mail login requires an adapter.")
+  }
+}

src/core/lib/callback-handler.ts

@@ -1,6 +1,11 @@
-import { AccountNotLinkedError } from "../../lib/errors"
-import dispatchEvent from "../lib/dispatch-event"
-import adapterErrorHandler from "../../adapters/error-handler"
+import { AccountNotLinkedError } from "../errors"
+import { fromDate } from "./utils"
+import { randomBytes, randomUUID } from "crypto"
+import { InternalOptions } from "../../lib/types"
+import { AdapterSession, AdapterUser } from "../../adapters"
+import { JWT } from "../../jwt"
+import { Account, User } from "../.."
+import { SessionToken } from "./cookie"
 
 /**
  * This function handles the complex flow of signing users in, and either creating,
@@ -13,78 +18,71 @@ import adapterErrorHandler from "../../adapters/error-handler"
  * All verification (e.g. OAuth flows or email address verificaiton flows) are
  * done prior to this handler being called to avoid additonal complexity in this
  * handler.
- * @param {import("types").Session} sessionToken
- * @param {import("types").Profile} profile
- * @param {import("types").Account} account
- * @param {import("types/internals").AppOptions} options
  */
-export default async function callbackHandler(
-  sessionToken,
-  profile,
-  providerAccount,
-  options
-) {
+export default async function callbackHandler(params: {
+  sessionToken?: SessionToken
+  profile: User
+  account: Account
+  options: InternalOptions
+}) {
+  const { sessionToken, profile, account, options } = params
   // Input validation
-  if (!profile) throw new Error("Missing profile")
-  if (!providerAccount?.id || !providerAccount.type)
+  if (!account?.providerAccountId || !account.type)
     throw new Error("Missing or invalid provider account")
-  if (!["email", "oauth"].includes(providerAccount.type))
+  if (!["email", "oauth"].includes(account.type))
     throw new Error("Provider not supported")
 
   const {
     adapter,
     jwt,
     events,
-    session: { jwt: useJwtSession },
+    session: { strategy: sessionStrategy },
   } = options
 
   // If no adapter is configured then we don't have a database and cannot
   // persist data; in this mode we just return a dummy session object.
   if (!adapter) {
-    return {
-      user: profile,
-      account: providerAccount,
-      session: {},
-    }
+    return { user: profile, account, session: {} }
   }
 
   const {
     createUser,
     updateUser,
     getUser,
-    getUserByProviderAccountId,
+    getUserByAccount,
     getUserByEmail,
     linkAccount,
     createSession,
-    getSession,
+    getSessionAndUser,
     deleteSession,
-  } = adapterErrorHandler(await adapter.getAdapter(options), options.logger)
+  } = adapter
 
-  let session = null
-  let user = null
-  let isSignedIn = null
+  let session: AdapterSession | JWT | null = null
+  let user: AdapterUser | null = null
   let isNewUser = false
 
+  const useJwtSession = sessionStrategy === "jwt"
+
   if (sessionToken) {
     if (useJwtSession) {
       try {
         session = await jwt.decode({ ...jwt, token: sessionToken })
-        if (session?.sub) {
+        if (session && "sub" in session && session.sub) {
           user = await getUser(session.sub)
-          isSignedIn = !!user
         }
       } catch {
         // If session can't be verified, treat as no session
       }
-    }
-    session = await getSession(sessionToken)
-    if (session?.userId) {
-      user = await getUser(session.userId)
-      isSignedIn = !!user
+    } else {
+      const userAndSession = await getSessionAndUser(sessionToken)
+      if (userAndSession) {
+        session = userAndSession.session
+        user = userAndSession.user
+      }
     }
   }
 
-  if (providerAccount.type === "email") {
+  if (account.type === "email") {
     // If signing in with an email, check if an account with the same email address exists already
     const userByEmail = profile.email
       ? await getUserByEmail(profile.email)
@@ -92,93 +90,74 @@ export default async function callbackHandler(
     if (userByEmail) {
       // If they are not already signed in as the same user, this flow will
       // sign them out of the current session and sign them in as the new user
-      if (isSignedIn) {
-        if (user.id !== userByEmail.id && !useJwtSession) {
-          // Delete existing session if they are currently signed in as another user.
-          // This will switch user accounts for the session in cases where the user was
-          // already logged in with a different account.
-          await deleteSession(sessionToken)
-        }
+      if (user?.id !== userByEmail.id && !useJwtSession && sessionToken) {
+        // Delete existing session if they are currently signed in as another user.
+        // This will switch user accounts for the session in cases where the user was
+        // already logged in with a different account.
+        await deleteSession(sessionToken)
       }
 
       // Update emailVerified property on the user object
-      const currentDate = new Date()
-      user = await updateUser({ ...userByEmail, emailVerified: currentDate })
-      await dispatchEvent(events.updateUser, user)
+      user = await updateUser({ id: userByEmail.id, emailVerified: new Date() })
+      await events.updateUser?.({ user })
     } else {
+      const newUser = { ...profile, emailVerified: new Date() }
+      delete (newUser as Omit<AdapterUser, "id">).id
       // Create user account if there isn't one for the email address already
-      const currentDate = new Date()
-      user = await createUser({ ...profile, emailVerified: currentDate })
-      await dispatchEvent(events.createUser, user)
+      user = await createUser(newUser)
+      await events.createUser?.({ user })
       isNewUser = true
     }
 
     // Create new session
-    session = useJwtSession ? {} : await createSession(user)
+    session = useJwtSession
+      ? {}
+      : await createSession({
+          sessionToken: generateSessionToken(),
+          userId: user.id,
+          expires: fromDate(options.session.maxAge),
+        })
 
-    return {
-      session,
-      user,
-      isNewUser,
-    }
-  } else if (providerAccount.type === "oauth") {
-    // If signing in with oauth account, check to see if the account exists already
-    const userByProviderAccountId = await getUserByProviderAccountId(
-      providerAccount.provider,
-      providerAccount.id
-    )
-    if (userByProviderAccountId) {
-      if (isSignedIn) {
+    return { session, user, isNewUser }
+  } else if (account.type === "oauth") {
+    // If signing in with OAuth account, check to see if the account exists already
+    const userByAccount = await getUserByAccount({
+      providerAccountId: account.providerAccountId,
+      provider: account.provider,
+    })
+    if (userByAccount) {
+      if (user) {
         // If the user is already signed in with this account, we don't need to do anything
-        // Note: These are cast as strings here to ensure they match as in
-        // some flows (e.g. JWT with a database) one of the values might be a
-        // string and the other might be an ObjectID and would otherwise fail.
-        if (`${userByProviderAccountId.id}` === `${user.id}`) {
-          return {
-            session,
-            user,
-            isNewUser,
-          }
+        if (userByAccount.id === user.id) {
+          return { session, user, isNewUser }
         }
         // If the user is currently signed in, but the new account they are signing in
-        // with is already associated with another account, then we cannot link them
+        // with is already associated with another user, then we cannot link them
         // and need to return an error.
-        throw new AccountNotLinkedError()
+        throw new AccountNotLinkedError(
+          "The account is already associated with another user"
+        )
       }
       // If there is no active session, but the account being signed in with is already
       // associated with a valid user then create session to sign the user in.
       session = useJwtSession
         ? {}
-        : await createSession(userByProviderAccountId)
-      return {
-        session,
-        user: userByProviderAccountId,
-        isNewUser,
-      }
+        : await createSession({
+            sessionToken: generateSessionToken(),
+            userId: userByAccount.id,
+            expires: fromDate(options.session.maxAge),
+          })
+
+      return { session, user: userByAccount, isNewUser }
     } else {
-      if (isSignedIn) {
+      if (user) {
         // If the user is already signed in and the OAuth account isn't already associated
         // with another user account then we can go ahead and link the accounts safely.
-        await linkAccount(
-          user.id,
-          providerAccount.provider,
-          providerAccount.type,
-          providerAccount.id,
-          providerAccount.refreshToken,
-          providerAccount.accessToken,
-          providerAccount.accessTokenExpires
-        )
-        await dispatchEvent(events.linkAccount, {
-          user,
-          providerAccount: providerAccount,
-        })
+        await linkAccount({ ...account, userId: user.id })
+        await events.linkAccount?.({ user, account })
 
         // As they are already signed in, we don't need to do anything after linking them
-        return {
-          session,
-          user,
-          isNewUser,
-        }
+        return { session, user, isNewUser }
       }
 
       // If the user is not signed in and it looks like a new OAuth account then we
@@ -209,7 +188,9 @@ export default async function callbackHandler(
         // We don't want to have two accounts with the same email address, and we don't
         // want to link them in case it's not safe to do so, so instead we prompt the user
         // to sign in via email to verify their identity and then link the accounts.
-        throw new AccountNotLinkedError()
+        throw new AccountNotLinkedError(
+          "Another account already exists with the same e-mail address"
+        )
       }
       // If the current user is not logged in and the profile isn't linked to any user
       // accounts (by email or provider account id)...
@@ -217,30 +198,28 @@ export default async function callbackHandler(
       // If no account matching the same [provider].id or .email exists, we can
       // create a new account for the user, link it to the OAuth acccount and
       // create a new session for them so they are signed in with it.
-      user = await createUser(profile)
-      await dispatchEvent(events.createUser, user)
+      const newUser = { ...profile, emailVerified: null }
+      delete (newUser as Omit<AdapterUser, "id">).id
+      user = await createUser(newUser)
+      await events.createUser?.({ user })
 
-      await linkAccount(
-        user.id,
-        providerAccount.provider,
-        providerAccount.type,
-        providerAccount.id,
-        providerAccount.refreshToken,
-        providerAccount.accessToken,
-        providerAccount.accessTokenExpires
-      )
-      await dispatchEvent(events.linkAccount, {
-        user,
-        providerAccount: providerAccount,
-      })
+      await linkAccount({ ...account, userId: user.id })
+      await events.linkAccount?.({ user, account })
 
-      session = useJwtSession ? {} : await createSession(user)
-      isNewUser = true
-      return {
-        session,
-        user,
-        isNewUser,
-      }
+      session = useJwtSession
+        ? {}
+        : await createSession({
+            sessionToken: generateSessionToken(),
+            userId: user.id,
+            expires: fromDate(options.session.maxAge),
+          })
+
+      return { session, user, isNewUser: true }
     }
   }
 }
+
+function generateSessionToken() {
+  // Use `randomUUID` if available. (Node 15.6++)
+  return randomUUID?.() ?? randomBytes(32).toString("hex")
+}

src/core/lib/callback-url.ts

@@ -0,0 +1,42 @@
+import { InternalOptions } from "../../lib/types"
+
+interface CreateCallbackUrlParams {
+  options: InternalOptions
+  /** Try reading value from request body (POST) then from query param (GET) */
+  paramValue?: string
+  cookieValue?: string
+}
+
+/**
+ * Get callback URL based on query param / cookie + validation,
+ * and add it to `req.options.callbackUrl`.
+ */
+export async function createCallbackUrl({
+  options,
+  paramValue,
+  cookieValue,
+}: CreateCallbackUrlParams) {
+  const { url, callbacks } = options
+
+  let callbackUrl = url.origin
+
+  if (paramValue) {
+    // If callbackUrl form field or query parameter is passed try to use it if allowed
+    callbackUrl = await callbacks.redirect({
+      url: paramValue,
+      baseUrl: url.origin,
+    })
+  } else if (cookieValue) {
+    // If no callbackUrl specified, try using the value from the cookie if allowed
+    callbackUrl = await callbacks.redirect({
+      url: cookieValue,
+      baseUrl: url.origin,
+    })
+  }
+
+  return {
+    callbackUrl,
+    // Save callback URL in a cookie so that it can be used for subsequent requests in signin/signout/callback flow
+    callbackUrlCookie: callbackUrl !== cookieValue ? callbackUrl : undefined,
+  }
+}

src/core/lib/cookie.ts

@@ -0,0 +1,212 @@
+import type { IncomingHttpHeaders } from "http"
+import type { CookiesOptions } from "../.."
+import type { CookieOption, LoggerInstance, SessionStrategy } from "../types"
+
+// Uncomment to recalculate the estimated size
+// of an empty session cookie
+// import { serialize } from "cookie"
+// console.log(
+//   "Cookie estimated to be ",
+//   serialize(`__Secure.next-auth.session-token.0`, "", {
+//     expires: new Date(),
+//     httpOnly: true,
+//     maxAge: Number.MAX_SAFE_INTEGER,
+//     path: "/",
+//     sameSite: "strict",
+//     secure: true,
+//     domain: "example.com",
+//   }).length,
+//   " bytes"
+// )
+
+const ALLOWED_COOKIE_SIZE = 4096
+// Based on commented out section above
+const ESTIMATED_EMPTY_COOKIE_SIZE = 163
+const CHUNK_SIZE = ALLOWED_COOKIE_SIZE - ESTIMATED_EMPTY_COOKIE_SIZE
+
+// REVIEW: Is there any way to defer two types of strings?
+
+/** Stringified form of `JWT`. Extract the content with `jwt.decode` */
+export type JWTString = string
+
+export type SetCookieOptions = Partial<CookieOption["options"]> & {
+  expires?: Date | string
+  encode?: (val: unknown) => string
+}
+
+/**
+ * If `options.session.strategy` is set to `jwt`, this is a stringified `JWT`.
+ * In case of `strategy: "database"`, this is the `sessionToken` of the session in the database.
+ */
+export type SessionToken<T extends SessionStrategy = "jwt"> = T extends "jwt"
+  ? JWTString
+  : string
+
+/**
+ * Use secure cookies if the site uses HTTPS
+ * This being conditional allows cookies to work non-HTTPS development URLs
+ * Honour secure cookie option, which sets 'secure' and also adds '__Secure-'
+ * prefix, but enable them by default if the site URL is HTTPS; but not for
+ * non-HTTPS URLs like http://localhost which are used in development).
+ * For more on prefixes see https://googlechrome.github.io/samples/cookie-prefixes/
+ *
+ * @TODO Review cookie settings (names, options)
+ */
+export function defaultCookies(useSecureCookies: boolean): CookiesOptions {
+  const cookiePrefix = useSecureCookies ? "__Secure-" : ""
+  return {
+    // default cookie options
+    sessionToken: {
+      name: `${cookiePrefix}next-auth.session-token`,
+      options: {
+        httpOnly: true,
+        sameSite: "lax",
+        path: "/",
+        secure: useSecureCookies,
+      },
+    },
+    callbackUrl: {
+      name: `${cookiePrefix}next-auth.callback-url`,
+      options: {
+        sameSite: "lax",
+        path: "/",
+        secure: useSecureCookies,
+      },
+    },
+    csrfToken: {
+      // Default to __Host- for CSRF token for additional protection if using useSecureCookies
+      // NB: The `__Host-` prefix is stricter than the `__Secure-` prefix.
+      name: `${useSecureCookies ? "__Host-" : ""}next-auth.csrf-token`,
+      options: {
+        httpOnly: true,
+        sameSite: "lax",
+        path: "/",
+        secure: useSecureCookies,
+      },
+    },
+    pkceCodeVerifier: {
+      name: `${cookiePrefix}next-auth.pkce.code_verifier`,
+      options: {
+        httpOnly: true,
+        sameSite: "lax",
+        path: "/",
+        secure: useSecureCookies,
+      },
+    },
+    state: {
+      name: `${cookiePrefix}next-auth.state`,
+      options: {
+        httpOnly: true,
+        sameSite: "lax",
+        path: "/",
+        secure: useSecureCookies,
+      },
+    },
+  }
+}
+
+export interface Cookie extends CookieOption {
+  value: string
+}
+
+type Chunks = Record<string, string>
+
+export class SessionStore {
+  #chunks: Chunks = {}
+  #option: CookieOption
+  #logger: LoggerInstance | Console
+
+  constructor(
+    option: CookieOption,
+    req: {
+      cookies?: Record<string, string>
+      headers?: Record<string, string> | IncomingHttpHeaders
+    },
+    logger: LoggerInstance | Console
+  ) {
+    this.#logger = logger
+    this.#option = option
+
+    if (!req) return
+
+    for (const name in req.cookies) {
+      if (name.startsWith(option.name)) {
+        this.#chunks[name] = req.cookies[name]
+      }
+    }
+  }
+
+  get value() {
+    return Object.values(this.#chunks)?.join("")
+  }
+
+  /** Given a cookie, return a list of cookies, chunked to fit the allowed cookie size. */
+  #chunk(cookie: Cookie): Cookie[] {
+    const chunkCount = Math.ceil(cookie.value.length / CHUNK_SIZE)
+
+    if (chunkCount === 1) {
+      this.#chunks[cookie.name] = cookie.value
+      return [cookie]
+    }
+
+    const cookies: Cookie[] = []
+    for (let i = 0; i < chunkCount; i++) {
+      const name = `${cookie.name}.${i}`
+      const value = cookie.value.substr(i * CHUNK_SIZE, CHUNK_SIZE)
+      cookies.push({ ...cookie, name, value })
+      this.#chunks[name] = value
+    }
+
+    this.#logger.debug("CHUNKING_SESSION_COOKIE", {
+      message: `Session cookie exceeds allowed ${ALLOWED_COOKIE_SIZE} bytes.`,
+      emptyCookieSize: ESTIMATED_EMPTY_COOKIE_SIZE,
+      valueSize: cookie.value.length,
+      chunks: cookies.map((c) => c.value.length + ESTIMATED_EMPTY_COOKIE_SIZE),
+    })
+
+    return cookies
+  }
+
+  /** Returns cleaned cookie chunks. */
+  #clean(): Record<string, Cookie> {
+    const cleanedChunks: Record<string, Cookie> = {}
+    for (const name in this.#chunks) {
+      delete this.#chunks?.[name]
+      cleanedChunks[name] = {
+        name,
+        value: "",
+        options: { ...this.#option.options, maxAge: 0 },
+      }
+    }
+    return cleanedChunks
+  }
+
+  /**
+   * Given a cookie value, return new cookies, chunked, to fit the allowed cookie size.
+   * If the cookie has changed from chunked to unchunked or vice versa,
+   * it deletes the old cookies as well.
+   */
+  chunk(value: string, options: Partial<Cookie["options"]>): Cookie[] {
+    // Assume all cookies should be cleaned by default
+    const cookies: Record<string, Cookie> = this.#clean()
+
+    // Calculate new chunks
+    const chunked = this.#chunk({
+      name: this.#option.name,
+      value,
+      options: { ...this.#option.options, ...options },
+    })
+
+    // Update stored chunks / cookies
+    for (const chunk of chunked) {
+      cookies[chunk.name] = chunk
+    }
+
+    return Object.values(cookies)
+  }
+
+  /** Returns a list of cookies that should be cleaned. */
+  clean(): Cookie[] {
+    return Object.values(this.#clean())
+  }
+}

src/core/lib/csrf-token.ts

@@ -0,0 +1,54 @@
+import { createHash, randomBytes } from "crypto"
+import { InternalOptions } from "../../lib/types"
+
+interface CreateCSRFTokenParams {
+  options: InternalOptions
+  cookieValue?: string
+  isPost: boolean
+  bodyValue?: string
+}
+
+/**
+ * Ensure CSRF Token cookie is set for any subsequent requests.
+ * Used as part of the strategy for mitigation for CSRF tokens.
+ *
+ * Creates a cookie like 'next-auth.csrf-token' with the value 'token|hash',
+ * where 'token' is the CSRF token and 'hash' is a hash made of the token and
+ * the secret, and the two values are joined by a pipe '|'. By storing the
+ * value and the hash of the value (with the secret used as a salt) we can
+ * verify the cookie was set by the server and not by a malicous attacker.
+ *
+ * For more details, see the following OWASP links:
+ * https://cheatsheetseries.owasp.org/cheatsheets/Cross-Site_Request_Forgery_Prevention_Cheat_Sheet.html#double-submit-cookie
+ * https://owasp.org/www-chapter-london/assets/slides/David_Johansson-Double_Defeat_of_Double-Submit_Cookie.pdf
+ */
+export function createCSRFToken({
+  options,
+  cookieValue,
+  isPost,
+  bodyValue,
+}: CreateCSRFTokenParams) {
+  if (cookieValue) {
+    const [csrfToken, csrfTokenHash] = cookieValue.split("|")
+    const expectedCsrfTokenHash = createHash("sha256")
+      .update(`${csrfToken}${options.secret}`)
+      .digest("hex")
+    if (csrfTokenHash === expectedCsrfTokenHash) {
+      // If hash matches then we trust the CSRF token value
+      // If this is a POST request and the CSRF Token in the POST request matches
+      // the cookie we have already verified is the one we have set, then the token is verified!
+      const csrfTokenVerified = isPost && csrfToken === bodyValue
+
+      return { csrfTokenVerified, csrfToken }
+    }
+  }
+
+  // New CSRF token
+  const csrfToken = randomBytes(32).toString("hex")
+  const csrfTokenHash = createHash("sha256")
+    .update(`${csrfToken}${options.secret}`)
+    .digest("hex")
+  const cookie = `${csrfToken}|${csrfTokenHash}`
+
+  return { cookie, csrfToken }
+}

src/core/lib/default-callbacks.ts

@@ -0,0 +1,18 @@
+import { CallbacksOptions } from "../.."
+
+export const defaultCallbacks: CallbacksOptions = {
+  signIn() {
+    return true
+  },
+  redirect({ url, baseUrl }) {
+    if (url.startsWith(baseUrl)) return url
+    else if (url.startsWith("/")) return new URL(url, baseUrl).toString()
+    return baseUrl
+  },
+  session({ session }) {
+    return session
+  },
+  jwt({ token }) {
+    return token
+  },
+}

src/core/lib/email/signin.ts

@@ -0,0 +1,54 @@
+import { randomBytes } from "crypto"
+import { InternalOptions } from "../../../lib/types"
+import { hashToken } from "../utils"
+
+/**
+ * Starts an e-mail login flow, by generating a token,
+ * and sending it to the user's e-mail (with the help of a DB adapter)
+ */
+export default async function email(
+  identifier: string,
+  options: InternalOptions<"email">
+) {
+  const { url, adapter, provider, logger, callbackUrl } = options
+
+  // Generate token
+  const token =
+    (await provider.generateVerificationToken?.()) ??
+    randomBytes(32).toString("hex")
+
+  const ONE_DAY_IN_SECONDS = 86400
+  const expires = new Date(
+    Date.now() + (provider.maxAge ?? ONE_DAY_IN_SECONDS) * 1000
+  )
+
+  // Save in database
+  // @ts-expect-error
+  await adapter.createVerificationToken({
+    identifier,
+    token: hashToken(token, options),
+    expires,
+  })
+
+  // Generate a link with email, unhashed token and callback url
+  const params = new URLSearchParams({ callbackUrl, token, email: identifier })
+  const _url = `${url}/callback/${provider.id}?${params}`
+
+  try {
+    // Send to user
+    await provider.sendVerificationRequest({
+      identifier,
+      token,
+      expires,
+      url: _url,
+      provider,
+    })
+  } catch (error) {
+    logger.error("SEND_VERIFICATION_EMAIL_ERROR", {
+      identifier,
+      url,
+      error: error as Error,
+    })
+    throw new Error("SEND_VERIFICATION_EMAIL_ERROR")
+  }
+}

src/core/lib/oauth/authorization-url.ts

@@ -0,0 +1,79 @@
+import { openidClient } from "./client"
+import { oAuth1Client } from "./client-legacy"
+import { createState } from "./state-handler"
+import { createPKCE } from "./pkce-handler"
+
+import type { AuthorizationParameters } from "openid-client"
+import type { InternalOptions } from "../../../lib/types"
+import type { IncomingRequest } from "../.."
+import type { Cookie } from "../cookie"
+
+/**
+ *
+ * Generates an authorization/request token URL.
+ *
+ * [OAuth 2](https://www.oauth.com/oauth2-servers/authorization/the-authorization-request/) | [OAuth 1](https://oauth.net/core/1.0a/#auth_step2)
+ */
+export default async function getAuthorizationUrl(params: {
+  options: InternalOptions<"oauth">
+  query: IncomingRequest["query"]
+}) {
+  const { options, query } = params
+  const { logger, provider } = options
+  try {
+    let params: any = {}
+
+    if (typeof provider.authorization === "string") {
+      const parsedUrl = new URL(provider.authorization)
+      const parsedParams = Object.fromEntries(parsedUrl.searchParams.entries())
+      params = { ...params, ...parsedParams }
+    } else {
+      params = { ...params, ...provider.authorization?.params }
+    }
+
+    params = { ...params, ...query }
+
+    // Handle OAuth v1.x
+    if (provider.version?.startsWith("1.")) {
+      const client = oAuth1Client(options)
+      const tokens = (await client.getOAuthRequestToken(params)) as any
+      const url = `${
+        // @ts-expect-error
+        provider.authorization?.url ?? provider.authorization
+      }?${new URLSearchParams({
+        oauth_token: tokens.oauth_token,
+        oauth_token_secret: tokens.oauth_token_secret,
+        ...tokens.params,
+      })}`
+
+      logger.debug("GET_AUTHORIZATION_URL", { url })
+      return { redirect: url }
+    }
+
+    const client = await openidClient(options)
+
+    const authorizationParams: AuthorizationParameters = params
+    const cookies: Cookie[] = []
+
+    const state = await createState(options)
+    if (state) {
+      authorizationParams.state = state.value
+      cookies.push(state.cookie)
+    }
+
+    const pkce = await createPKCE(options)
+    if (pkce) {
+      authorizationParams.code_challenge = pkce.code_challenge
+      authorizationParams.code_challenge_method = pkce.code_challenge_method
+      cookies.push(pkce.cookie)
+    }
+
+    const url = client.authorizationUrl(authorizationParams)
+
+    logger.debug("GET_AUTHORIZATION_URL", { url, cookies })
+    return { redirect: url, cookies }
+  } catch (error) {
+    logger.error("GET_AUTHORIZATION_URL_ERROR", error as Error)
+    throw error
+  }
+}

src/core/lib/oauth/callback.ts

@@ -0,0 +1,211 @@
+import { CallbackParamsType, TokenSet } from "openid-client"
+import { openidClient } from "./client"
+import { oAuth1Client } from "./client-legacy"
+import { useState } from "./state-handler"
+import { usePKCECodeVerifier } from "./pkce-handler"
+import { OAuthCallbackError } from "../../errors"
+
+import type { Account, LoggerInstance, Profile } from "../../.."
+import type { OAuthChecks, OAuthConfig } from "../../../providers"
+import type { InternalOptions } from "../../../lib/types"
+import type { IncomingRequest, OutgoingResponse } from "../.."
+import type { Cookie } from "../cookie"
+
+export default async function oAuthCallback(params: {
+  options: InternalOptions<"oauth">
+  query: IncomingRequest["query"]
+  body: IncomingRequest["body"]
+  method: Required<IncomingRequest>["method"]
+  cookies: IncomingRequest["cookies"]
+}): Promise<GetProfileResult & { cookies?: OutgoingResponse["cookies"] }> {
+  const { options, query, body, method, cookies } = params
+  const { logger, provider } = options
+
+  const errorMessage = body?.error ?? query?.error
+  if (errorMessage) {
+    const error = new Error(errorMessage)
+    logger.error("OAUTH_CALLBACK_HANDLER_ERROR", {
+      error,
+      error_description: query?.error_description,
+      body,
+      providerId: provider.id,
+    })
+    throw error
+  }
+
+  if (provider.version?.startsWith("1.")) {
+    try {
+      const client = await oAuth1Client(options)
+      // Handle OAuth v1.x
+      const { oauth_token, oauth_verifier } = query ?? {}
+      // @ts-expect-error
+      const tokens: TokenSet = await client.getOAuthAccessToken(
+        oauth_token as string,
+        // @ts-expect-error
+        null,
+        oauth_verifier
+      )
+      // @ts-expect-error
+      let profile: Profile = await client.get(
+        (provider as any).profileUrl,
+        tokens.oauth_token,
+        tokens.oauth_token_secret
+      )
+
+      if (typeof profile === "string") {
+        profile = JSON.parse(profile)
+      }
+
+      return await getProfile({ profile, tokens, provider, logger })
+    } catch (error) {
+      logger.error("OAUTH_V1_GET_ACCESS_TOKEN_ERROR", error as Error)
+      throw error
+    }
+  }
+
+  try {
+    const client = await openidClient(options)
+
+    let tokens: TokenSet
+
+    const checks: OAuthChecks = {}
+    const resCookies: Cookie[] = []
+
+    const state = await useState(cookies?.[options.cookies.state.name], options)
+
+    if (state) {
+      checks.state = state.value
+      resCookies.push(state.cookie)
+    }
+
+    const codeVerifier = cookies?.[options.cookies.pkceCodeVerifier.name]
+    const pkce = await usePKCECodeVerifier(codeVerifier, options)
+    if (pkce) {
+      checks.code_verifier = pkce.codeVerifier
+      resCookies.push(pkce.cookie)
+    }
+
+    const params: CallbackParamsType = {
+      ...client.callbackParams({
+        url: `http://n?${new URLSearchParams(query)}`,
+        // TODO: Ask to allow object to be passed upstream:
+        // https://github.com/panva/node-openid-client/blob/3ae206dfc78c02134aa87a07f693052c637cab84/types/index.d.ts#L439
+        // @ts-expect-error
+        body,
+        method,
+      }),
+      // @ts-expect-error
+      ...provider.token?.params,
+    }
+
+    // @ts-expect-error
+    if (provider.token?.request) {
+      // @ts-expect-error
+      const response = await provider.token.request({
+        provider,
+        params,
+        checks,
+        client,
+      })
+      tokens = new TokenSet(response.tokens)
+    } else if (provider.idToken) {
+      tokens = await client.callback(provider.callbackUrl, params, checks)
+    } else {
+      tokens = await client.oauthCallback(provider.callbackUrl, params, checks)
+    }
+
+    // REVIEW: How can scope be returned as an array?
+    if (Array.isArray(tokens.scope)) {
+      tokens.scope = tokens.scope.join(" ")
+    }
+
+    let profile: Profile
+    // @ts-expect-error
+    if (provider.userinfo?.request) {
+      // @ts-expect-error
+      profile = await provider.userinfo.request({
+        provider,
+        tokens,
+        client,
+      })
+    } else if (provider.idToken) {
+      profile = tokens.claims()
+    } else {
+      profile = await client.userinfo(tokens, {
+        // @ts-expect-error
+        params: provider.userinfo?.params,
+      })
+    }
+
+    const profileResult = await getProfile({
+      profile,
+      provider,
+      tokens,
+      logger,
+    })
+    return { ...profileResult, cookies: resCookies }
+  } catch (error) {
+    logger.error("OAUTH_CALLBACK_ERROR", {
+      error: error as Error,
+      providerId: provider.id,
+    })
+    throw new OAuthCallbackError(error as Error)
+  }
+}
+
+export interface GetProfileParams {
+  profile: Profile
+  tokens: TokenSet
+  provider: OAuthConfig<any>
+  logger: LoggerInstance
+}
+
+export interface GetProfileResult {
+  // @ts-expect-error
+  profile: ReturnType<OAuthConfig["profile"]> | null
+  account: Omit<Account, "userId"> | null
+  OAuthProfile: Profile
+}
+
+/** Returns profile, raw profile and auth provider details */
+async function getProfile({
+  profile: OAuthProfile,
+  tokens,
+  provider,
+  logger,
+}: GetProfileParams): Promise<GetProfileResult> {
+  try {
+    logger.debug("PROFILE_DATA", { OAuthProfile })
+    // @ts-expect-error
+    const profile = await provider.profile(OAuthProfile, tokens)
+    profile.email = profile.email?.toLowerCase()
+    // Return profile, raw profile and auth provider details
+    return {
+      profile,
+      account: {
+        provider: provider.id,
+        type: provider.type,
+        providerAccountId: profile.id.toString(),
+        ...tokens,
+      },
+      OAuthProfile,
+    }
+  } catch (error) {
+    // If we didn't get a response either there was a problem with the provider
+    // response *or* the user cancelled the action with the provider.
+    //
+    // Unfortuately, we can't tell which - at least not in a way that works for
+    // all providers, so we return an empty object; the user should then be
+    // redirected back to the sign up page. We log the error to help developers
+    // who might be trying to debug this when configuring a new provider.
+    logger.error("OAUTH_PARSE_PROFILE_ERROR", {
+      error: error as Error,
+      OAuthProfile,
+    })
+    return {
+      profile: null,
+      account: null,
+      OAuthProfile,
+    }
+  }
+}

src/core/lib/oauth/client-legacy.ts

@@ -0,0 +1,69 @@
+// This is kept around for being backwards compatible with OAuth 1.0 providers.
+// We have the intentions to provide only minor fixes for this in the future.
+
+import { OAuth } from "oauth"
+import { InternalOptions } from "src/lib/types"
+
+/**
+ * Client supporting OAuth 1.x
+ */
+export function oAuth1Client(options: InternalOptions<"oauth">) {
+  const provider = options.provider
+
+  const oauth1Client = new OAuth(
+    provider.requestTokenUrl as string,
+    provider.accessTokenUrl as string,
+    provider.clientId as string,
+    provider.clientSecret as string,
+    provider.version ?? "1.0",
+    provider.callbackUrl,
+    provider.encoding ?? "HMAC-SHA1"
+  )
+
+  // Promisify get()  for OAuth1
+  const originalGet = oauth1Client.get.bind(oauth1Client)
+  // @ts-expect-error
+  oauth1Client.get = async (...args) => {
+    return await new Promise((resolve, reject) => {
+      originalGet(...args, (error, result) => {
+        if (error) {
+          return reject(error)
+        }
+        resolve(result)
+      })
+    })
+  }
+  // Promisify getOAuth1AccessToken()  for OAuth1
+  const originalGetOAuth1AccessToken =
+    oauth1Client.getOAuthAccessToken.bind(oauth1Client)
+  oauth1Client.getOAuthAccessToken = async (...args: any[]) => {
+    return await new Promise((resolve, reject) => {
+      originalGetOAuth1AccessToken(
+        ...args,
+        (error: any, oauth_token: any, oauth_token_secret: any) => {
+          if (error) {
+            return reject(error)
+          }
+          resolve({ oauth_token, oauth_token_secret } as any)
+        }
+      )
+    })
+  }
+
+  const originalGetOAuthRequestToken =
+    oauth1Client.getOAuthRequestToken.bind(oauth1Client)
+  oauth1Client.getOAuthRequestToken = async (params = {}) => {
+    return await new Promise((resolve, reject) => {
+      originalGetOAuthRequestToken(
+        params,
+        (error, oauth_token, oauth_token_secret, params) => {
+          if (error) {
+            return reject(error)
+          }
+          resolve({ oauth_token, oauth_token_secret, params } as any)
+        }
+      )
+    })
+  }
+  return oauth1Client
+}

src/core/lib/oauth/client.ts

@@ -0,0 +1,50 @@
+import { Issuer, Client, custom } from "openid-client"
+import { InternalOptions } from "src/lib/types"
+
+/**
+ * NOTE: We can add auto discovery of the provider's endpoint
+ * that requires only one endpoint to be specified by the user.
+ * Check out `Issuer.discover`
+ *
+ * Client supporting OAuth 2.x and OIDC
+ */
+export async function openidClient(
+  options: InternalOptions<"oauth">
+): Promise<Client> {
+  const provider = options.provider
+
+  let issuer: Issuer
+  if (provider.wellKnown) {
+    issuer = await Issuer.discover(provider.wellKnown)
+  } else {
+    issuer = new Issuer({
+      issuer: provider.issuer as string,
+      authorization_endpoint:
+        // @ts-expect-error
+        provider.authorization?.url ?? provider.authorization,
+      // @ts-expect-error
+      token_endpoint: provider.token?.url ?? provider.token,
+      // @ts-expect-error
+      userinfo_endpoint: provider.userinfo?.url ?? provider.userinfo,
+    })
+  }
+
+  const client = new issuer.Client(
+    {
+      client_id: provider.clientId as string,
+      client_secret: provider.clientSecret as string,
+      redirect_uris: [provider.callbackUrl],
+      ...provider.client,
+    },
+    provider.jwks
+  )
+
+  // allow a 10 second skew
+  // See https://github.com/nextauthjs/next-auth/issues/3032
+  // and https://github.com/nextauthjs/next-auth/issues/3067
+  client[custom.clock_tolerance] = 10
+
+  if (provider.httpOptions) custom.setHttpOptionsDefaults(provider.httpOptions)
+
+  return client
+}

src/core/lib/oauth/pkce-handler.ts

@@ -0,0 +1,84 @@
+import * as jwt from "../../../jwt"
+import { generators } from "openid-client"
+import type { InternalOptions } from "src/lib/types"
+import type { Cookie } from "../cookie"
+
+const PKCE_CODE_CHALLENGE_METHOD = "S256"
+const PKCE_MAX_AGE = 60 * 15 // 15 minutes in seconds
+
+/**
+ * Returns `code_challenge` and `code_challenge_method`
+ * and saves them in a cookie.
+ */
+export async function createPKCE(options: InternalOptions<"oauth">): Promise<
+  | undefined
+  | {
+      code_challenge: string
+      code_challenge_method: "S256"
+      cookie: Cookie
+    }
+> {
+  const { cookies, logger, provider } = options
+  if (!provider.checks?.includes("pkce")) {
+    // Provider does not support PKCE, return nothing.
+    return
+  }
+  const code_verifier = generators.codeVerifier()
+  const code_challenge = generators.codeChallenge(code_verifier)
+
+  const expires = new Date()
+  expires.setTime(expires.getTime() + PKCE_MAX_AGE * 1000)
+
+  // Encrypt code_verifier and save it to an encrypted cookie
+  const encryptedCodeVerifier = await jwt.encode({
+    ...options.jwt,
+    maxAge: PKCE_MAX_AGE,
+    token: { code_verifier },
+  })
+
+  logger.debug("CREATE_PKCE_CHALLENGE_VERIFIER", {
+    code_challenge,
+    code_challenge_method: PKCE_CODE_CHALLENGE_METHOD,
+    code_verifier,
+    PKCE_MAX_AGE,
+  })
+
+  return {
+    code_challenge,
+    code_challenge_method: PKCE_CODE_CHALLENGE_METHOD,
+    cookie: {
+      name: cookies.pkceCodeVerifier.name,
+      value: encryptedCodeVerifier,
+      options: { ...cookies.pkceCodeVerifier.options, expires },
+    },
+  }
+}
+
+/**
+ * Returns code_verifier if provider uses PKCE,
+ * and clears the container cookie afterwards.
+ */
+export async function usePKCECodeVerifier(
+  codeVerifier: string | undefined,
+  options: InternalOptions<"oauth">
+): Promise<{ codeVerifier: string; cookie: Cookie } | undefined> {
+  const { cookies, provider } = options
+
+  if (!provider?.checks?.includes("pkce") || !codeVerifier) {
+    return
+  }
+
+  const pkce = (await jwt.decode({
+    ...options.jwt,
+    token: codeVerifier,
+  })) as any
+
+  return {
+    codeVerifier: pkce?.code_verifier ?? undefined,
+    cookie: {
+      name: cookies.pkceCodeVerifier.name,
+      value: "",
+      options: { ...cookies.pkceCodeVerifier.options, maxAge: 0 },
+    },
+  }
+}

src/core/lib/oauth/state-handler.ts

@@ -0,0 +1,63 @@
+import { generators } from "openid-client"
+
+import type { InternalOptions } from "src/lib/types"
+import type { Cookie } from "../cookie"
+
+const STATE_MAX_AGE = 60 * 15 // 15 minutes in seconds
+
+/** Returns state if the provider supports it */
+export async function createState(
+  options: InternalOptions<"oauth">
+): Promise<{ cookie: Cookie; value: string } | undefined> {
+  const { logger, provider, jwt, cookies } = options
+
+  if (!provider.checks?.includes("state")) {
+    // Provider does not support state, return nothing
+    return
+  }
+
+  const state = generators.state()
+
+  const encodedState = await jwt.encode({
+    ...jwt,
+    maxAge: STATE_MAX_AGE,
+    token: { state },
+  })
+
+  logger.debug("CREATE_STATE", { state, maxAge: STATE_MAX_AGE })
+
+  const expires = new Date()
+  expires.setTime(expires.getTime() + STATE_MAX_AGE * 1000)
+  return {
+    value: state,
+    cookie: {
+      name: cookies.state.name,
+      value: encodedState,
+      options: { ...cookies.state.options, expires },
+    },
+  }
+}
+
+/**
+ * Returns state from if the provider supports states,
+ * and clears the container cookie afterwards.
+ */
+export async function useState(
+  state: string | undefined,
+  options: InternalOptions<"oauth">
+): Promise<{ value: string; cookie: Cookie } | undefined> {
+  const { cookies, provider, jwt } = options
+
+  if (!provider.checks?.includes("state") || !state) return
+
+  const value = (await jwt.decode({ ...options.jwt, token: state })) as any
+
+  return {
+    value: value?.state ?? undefined,
+    cookie: {
+      name: cookies.state.name,
+      value: "",
+      options: { ...cookies.pkceCodeVerifier.options, maxAge: 0 },
+    },
+  }
+}

src/core/lib/providers.ts

@@ -0,0 +1,68 @@
+import { InternalProvider } from "../../lib/types"
+import { Provider } from "../../providers"
+import { merge } from "../../lib/merge"
+import { InternalUrl } from "../../lib/parse-url"
+
+/**
+ * Adds `signinUrl` and `callbackUrl` to each provider
+ * and deep merge user-defined options.
+ */
+export default function parseProviders(params: {
+  providers: Provider[]
+  url: InternalUrl
+  providerId?: string
+}): {
+  providers: InternalProvider[]
+  provider?: InternalProvider
+} {
+  const { url, providerId } = params
+
+  const providers = params.providers.map(({ options, ...rest }) => {
+    const defaultOptions = normalizeProvider(rest as Provider)
+    const userOptions = normalizeProvider(options as Provider)
+
+    return merge(defaultOptions, {
+      ...userOptions,
+      signinUrl: `${url}/signin/${userOptions?.id ?? rest.id}`,
+      callbackUrl: `${url}/callback/${userOptions?.id ?? rest.id}`,
+    })
+  })
+
+  const provider = providers.find(({ id }) => id === providerId)
+
+  return { providers, provider }
+}
+
+function normalizeProvider(provider?: Provider) {
+  if (!provider) return
+
+  const normalizedProvider: InternalProvider = Object.entries(
+    provider
+  ).reduce<InternalProvider>((acc, [key, value]) => {
+    if (
+      ["authorization", "token", "userinfo"].includes(key) &&
+      typeof value === "string"
+    ) {
+      const url = new URL(value)
+      ;(acc as any)[key] = {
+        url: `${url.origin}${url.pathname}`,
+        params: Object.fromEntries(url.searchParams ?? []),
+      }
+    } else {
+      acc[key as keyof InternalProvider] = value
+    }
+
+    return acc
+    // eslint-disable-next-line @typescript-eslint/prefer-reduce-type-parameter, @typescript-eslint/consistent-type-assertions
+  }, {} as InternalProvider)
+
+  // Checks only work on OAuth 2.x + OIDC providers
+  if (
+    provider.type === "oauth" &&
+    !provider.version?.startsWith("1.") &&
+    !provider.checks
+  ) {
+    ;(normalizedProvider as InternalProvider<"oauth">).checks = ["state"]
+  }
+  return normalizedProvider
+}

src/core/lib/utils.ts

@@ -0,0 +1,42 @@
+import { createHash } from "crypto"
+import { NextAuthOptions } from "../.."
+import { InternalOptions } from "../../lib/types"
+import { InternalUrl } from "../../lib/parse-url"
+
+/**
+ * Takes a number in seconds and returns the date in the future.
+ * Optionally takes a second date parameter. In that case
+ * the date in the future will be calculated from that date instead of now.
+ */
+export function fromDate(time: number, date = Date.now()) {
+  return new Date(date + time * 1000)
+}
+
+export function hashToken(token: string, options: InternalOptions<"email">) {
+  const { provider, secret } = options
+  return (
+    createHash("sha256")
+      // Prefer provider specific secret, but use default secret if none specified
+      .update(`${token}${provider.secret ?? secret}`)
+      .digest("hex")
+  )
+}
+
+/**
+ * Secret used salt cookies and tokens (e.g. for CSRF protection).
+ * If no secret option is specified then it creates one on the fly
+ * based on options passed here. If options contains unique data, such as
+ * OAuth provider secrets and database credentials it should be sufficent. If no secret provided in production, we throw an error. */
+export default function createSecret(params: {
+  userOptions: NextAuthOptions
+  url: InternalUrl
+}) {
+  const { userOptions, url } = params
+
+  return (
+    userOptions.secret ??
+    createHash("sha256")
+      .update(JSON.stringify({ ...url, ...userOptions }))
+      .digest("hex")
+  )
+}

src/core/pages/error.tsx

@@ -0,0 +1,108 @@
+import { Theme } from "../.."
+import { InternalUrl } from "../../lib/parse-url"
+
+export interface ErrorProps {
+  url?: InternalUrl
+  theme?: Theme
+  error?: string
+}
+
+interface ErrorView {
+  status: number
+  heading: string
+  message: JSX.Element
+  signin?: JSX.Element
+}
+
+export type ErrorType =
+  | "default"
+  | "configuration"
+  | "accessdenied"
+  | "verification"
+
+/** Renders an error page. */
+export default function ErrorPage(props: ErrorProps) {
+  const { url, error = "default", theme } = props
+  const signinPageUrl = `${url}/signin`
+
+  const errors: Record<ErrorType, ErrorView> = {
+    default: {
+      status: 200,
+      heading: "Error",
+      message: (
+        <p>
+          <a className="site" href={url?.origin}>
+            {url?.host}
+          </a>
+        </p>
+      ),
+    },
+    configuration: {
+      status: 500,
+      heading: "Server error",
+      message: (
+        <div>
+          <p>There is a problem with the server configuration.</p>
+          <p>Check the server logs for more information.</p>
+        </div>
+      ),
+    },
+    accessdenied: {
+      status: 403,
+      heading: "Access Denied",
+      message: (
+        <div>
+          <p>You do not have permission to sign in.</p>
+          <p>
+            <a className="button" href={signinPageUrl}>
+              Sign in
+            </a>
+          </p>
+        </div>
+      ),
+    },
+    verification: {
+      status: 403,
+      heading: "Unable to sign in",
+      message: (
+        <div>
+          <p>The sign in link is no longer valid.</p>
+          <p>It may have been used already or it may have expired.</p>
+        </div>
+      ),
+      signin: (
+        <p>
+          <a className="button" href={signinPageUrl}>
+            Sign in
+          </a>
+        </p>
+      ),
+    },
+  }
+
+  const { status, heading, message, signin } =
+    errors[error.toLowerCase()] ?? errors.default
+
+  return {
+    status,
+    html: (
+      <div className="error">
+      { theme?.brandColor && <style
+        dangerouslySetInnerHTML={{
+          __html: `
+        :root {
+          --brand-color: ${theme?.brandColor}
+        }
+      `,
+        }}
+      /> }
+        {theme?.logo && <img src={theme.logo} alt="Logo" className="logo" />}
+        <div className="card">
+          <h1>{heading}</h1>
+          <div className="message">{message}</div>
+          {signin}
+        </div>
+      </div>
+    ),
+  }
+}

src/core/pages/index.ts

@@ -0,0 +1,79 @@
+import renderToString from "preact-render-to-string"
+import SigninPage from "./signin"
+import SignoutPage from "./signout"
+import VerifyRequestPage from "./verify-request"
+import ErrorPage from "./error"
+import css from "../../css"
+
+import type { InternalOptions } from "../../lib/types"
+import type { IncomingRequest, OutgoingResponse } from ".."
+import type { Cookie } from "../lib/cookie"
+import type { ErrorType } from "./error"
+
+type RenderPageParams = {
+  query?: IncomingRequest["query"]
+  cookies?: Cookie[]
+} & Partial<
+  Pick<
+    InternalOptions,
+    "url" | "callbackUrl" | "csrfToken" | "providers" | "theme"
+  >
+>
+
+/**
+ * Unless the user defines their [own pages](https://next-auth.js.org/configuration/pages),
+ * we render a set of default ones, using Preact SSR.
+ */
+export default function renderPage(params: RenderPageParams) {
+  const { url, theme, query, cookies } = params
+
+  function send({ html, title, status }: any): OutgoingResponse {
+    return {
+      cookies,
+      status,
+      headers: [{ key: "Content-Type", value: "text/html" }],
+      body: `<!DOCTYPE html><html lang="en"><head><meta charset="UTF-8"><meta http-equiv="X-UA-Compatible" content="IE=edge"><meta name="viewport" content="width=device-width, initial-scale=1.0"><style>${css()}</style><title>${title}</title></head><body class="__next-auth-theme-${
+        theme?.colorScheme ?? "auto"
+      }"><div class="page">${renderToString(html)}</div></body></html>`,
+    }
+  }
+
+  return {
+    signin(props?: any) {
+      return send({
+        html: SigninPage({
+          csrfToken: params.csrfToken,
+          providers: params.providers,
+          callbackUrl: params.callbackUrl,
+          theme,
+          ...query,
+          ...props,
+        }),
+        title: "Sign In",
+      })
+    },
+    signout(props?: any) {
+      return send({
+        html: SignoutPage({
+          csrfToken: params.csrfToken,
+          url,
+          theme,
+          ...props,
+        }),
+        title: "Sign Out",
+      })
+    },
+    verifyRequest(props?: any) {
+      return send({
+        html: VerifyRequestPage({ url, theme, ...props }),
+        title: "Verify Request",
+      })
+    },
+    error(props?: { error?: ErrorType }) {
+      return send({
+        ...ErrorPage({ url, theme, ...props }),
+        title: "Error",
+      })
+    },
+  }
+}

src/core/pages/signin.tsx

@@ -0,0 +1,151 @@
+import { Theme } from "../.."
+import { InternalProvider } from "../../lib/types"
+
+export interface SignInServerPageParams {
+  csrfToken: string
+  providers: InternalProvider[]
+  callbackUrl: string
+  email: string
+  error: string
+  theme: Theme
+}
+
+export default function SigninPage(props: SignInServerPageParams) {
+  const {
+    csrfToken,
+    providers,
+    callbackUrl,
+    theme,
+    email,
+    error: errorType,
+  } = props
+  // We only want to render providers
+  const providersToRender = providers.filter((provider) => {
+    if (provider.type === "oauth" || provider.type === "email") {
+      // Always render oauth and email type providers
+      return true
+    } else if (provider.type === "credentials" && provider.credentials) {
+      // Only render credentials type provider if credentials are defined
+      return true
+    }
+    // Don't render other provider types
+    return false
+  })
+
+  if (typeof document !== "undefined" && theme.brandColor) {
+    document.documentElement.style.setProperty(
+      "--brand-color",
+      theme.brandColor
+    )
+  }
+
+  const errors: Record<string, string> = {
+    Signin: "Try signing in with a different account.",
+    OAuthSignin: "Try signing in with a different account.",
+    OAuthCallback: "Try signing in with a different account.",
+    OAuthCreateAccount: "Try signing in with a different account.",
+    EmailCreateAccount: "Try signing in with a different account.",
+    Callback: "Try signing in with a different account.",
+    OAuthAccountNotLinked:
+      "To confirm your identity, sign in with the same account you used originally.",
+    EmailSignin: "Check your email inbox.",
+    CredentialsSignin:
+      "Sign in failed. Check the details you provided are correct.",
+    SessionRequired: "Please sign in to access this page.",
+    default: "Unable to sign in.",
+  }
+
+  const error = errorType && (errors[errorType] ?? errors.default)
+
+  return (
+    <div className="signin">
+      
+      { theme.brandColor && <style
+        dangerouslySetInnerHTML={{
+          __html: `
+        :root {
+          --brand-color: ${theme.brandColor}
+        }
+      `,
+        }}
+      /> }
+      {theme.logo && <img src={theme.logo} alt="Logo" className="logo" />}
+      <div className="card">
+        {error && (
+          <div className="error">
+            <p>{error}</p>
+          </div>
+        )}
+        {providersToRender.map((provider, i: number) => (
+          <div key={provider.id} className="provider">
+            {provider.type === "oauth" && (
+              <form action={provider.signinUrl} method="POST">
+                <input type="hidden" name="csrfToken" value={csrfToken} />
+                {callbackUrl && (
+                  <input type="hidden" name="callbackUrl" value={callbackUrl} />
+                )}
+                <button type="submit" className="button">
+                  Sign in with {provider.name}
+                </button>
+              </form>
+            )}
+            {(provider.type === "email" || provider.type === "credentials") &&
+              i > 0 &&
+              providersToRender[i - 1].type !== "email" &&
+              providersToRender[i - 1].type !== "credentials" && <hr />}
+            {provider.type === "email" && (
+              <form action={provider.signinUrl} method="POST">
+                <input type="hidden" name="csrfToken" value={csrfToken} />
+                <label
+                  className="section-header"
+                  htmlFor={`input-email-for-${provider.id}-provider`}
+                >
+                  Email
+                </label>
+                <input
+                  id={`input-email-for-${provider.id}-provider`}
+                  autoFocus
+                  type="text"
+                  name="email"
+                  value={email}
+                  placeholder="email@example.com"
+                />
+                <button type="submit">Sign in with {provider.name}</button>
+              </form>
+            )}
+            {provider.type === "credentials" && (
+              <form action={provider.callbackUrl} method="POST">
+                <input type="hidden" name="csrfToken" value={csrfToken} />
+                {Object.keys(provider.credentials).map((credential) => {
+                  return (
+                    <div key={`input-group-${provider.id}`}>
+                      <label
+                        className="section-header"
+                        htmlFor={`input-${credential}-for-${provider.id}-provider`}
+                      >
+                        {provider.credentials[credential].label ?? credential}
+                      </label>
+                      <input
+                        name={credential}
+                        id={`input-${credential}-for-${provider.id}-provider`}
+                        type={provider.credentials[credential].type ?? "text"}
+                        placeholder={
+                          provider.credentials[credential].placeholder ??
+                          "Password"
+                        }
+                        {...provider.credentials[credential]}
+                      />
+                    </div>
+                  )
+                })}
+                <button type="submit">Sign in with {provider.name}</button>
+              </form>
+            )}
+            {(provider.type === "email" || provider.type === "credentials") &&
+              i + 1 < providersToRender.length && <hr />}
+          </div>
+        ))}
+      </div>
+    </div>
+  )
+}

src/core/pages/signout.tsx

@@ -0,0 +1,35 @@
+import { Theme } from "../.."
+import { InternalUrl } from "../../lib/parse-url"
+
+export interface SignoutProps {
+  url: InternalUrl
+  csrfToken: string
+  theme: Theme
+}
+
+export default function SignoutPage(props: SignoutProps) {
+  const { url, csrfToken, theme } = props
+
+  return (
+    <div className="signout">
+      { theme.brandColor && <style
+        dangerouslySetInnerHTML={{
+          __html: `
+        :root {
+          --brand-color: ${theme.brandColor}
+        }
+      `,
+        }}
+      /> }
+      {theme.logo && <img src={theme.logo} alt="Logo" className="logo" />}
+      <div className="card">
+        <h1>Signout</h1>
+        <p>Are you sure you want to sign out?</p>
+        <form action={`${url}/signout`} method="POST">
+          <input type="hidden" name="csrfToken" value={csrfToken} />
+          <button type="submit">Sign out</button>
+        </form>
+      </div>
+    </div>
+  )
+}

src/core/pages/verify-request.tsx

@@ -0,0 +1,35 @@
+import { Theme } from "../.."
+import { InternalUrl } from "../../lib/parse-url"
+
+interface VerifyRequestPageProps {
+  url: InternalUrl
+  theme: Theme
+}
+
+export default function VerifyRequestPage(props: VerifyRequestPageProps) {
+  const { url, theme } = props
+
+  return (
+    <div className="verify-request">
+      { theme.brandColor && <style
+        dangerouslySetInnerHTML={{
+          __html: `
+        :root {
+          --brand-color: ${theme.brandColor}
+        }
+      `,
+        }}
+      /> }
+      {theme.logo && <img src={theme.logo} alt="Logo" className="logo" />}
+      <div className="card">
+        <h1>Check your email</h1>
+        <p>A sign in link has been sent to your email address.</p>
+        <p>
+          <a className="site" href={url.origin}>
+            {url.host}
+          </a>
+        </p>
+      </div>
+    </div>
+  )
+}

src/core/routes/callback.ts

@@ -0,0 +1,429 @@
+import oAuthCallback from "../lib/oauth/callback"
+import callbackHandler from "../lib/callback-handler"
+import { hashToken } from "../lib/utils"
+
+import type { InternalOptions } from "../../lib/types"
+import type { IncomingRequest, OutgoingResponse } from ".."
+import type { Cookie, SessionStore } from "../lib/cookie"
+import type { User } from "../.."
+
+/** Handle callbacks from login services */
+export default async function callback(params: {
+  options: InternalOptions<"oauth" | "credentials" | "email">
+  query: IncomingRequest["query"]
+  method: Required<IncomingRequest>["method"]
+  body: IncomingRequest["body"]
+  headers: IncomingRequest["headers"]
+  cookies: IncomingRequest["cookies"]
+  sessionStore: SessionStore
+}): Promise<OutgoingResponse> {
+  const { options, query, body, method, headers, sessionStore } = params
+  const {
+    provider,
+    adapter,
+    url,
+    callbackUrl,
+    pages,
+    jwt,
+    events,
+    callbacks,
+    session: { strategy: sessionStrategy, maxAge: sessionMaxAge },
+    logger,
+  } = options
+
+  const cookies: Cookie[] = []
+
+  const useJwtSession = sessionStrategy === "jwt"
+
+  if (provider.type === "oauth") {
+    try {
+      const {
+        profile,
+        account,
+        OAuthProfile,
+        cookies: oauthCookies,
+      } = await oAuthCallback({
+        query,
+        body,
+        method,
+        options,
+        cookies: params.cookies,
+      })
+
+      if (oauthCookies) cookies.push(...oauthCookies)
+
+      try {
+        // Make it easier to debug when adding a new provider
+        logger.debug("OAUTH_CALLBACK_RESPONSE", {
+          profile,
+          account,
+          OAuthProfile,
+        })
+
+        // If we don't have a profile object then either something went wrong
+        // or the user cancelled signing in. We don't know which, so we just
+        // direct the user to the signin page for now. We could do something
+        // else in future.
+        //
+        // Note: In oAuthCallback an error is logged with debug info, so it
+        // should at least be visible to developers what happened if it is an
+        // error with the provider.
+        if (!profile) {
+          return { redirect: `${url}/signin`, cookies }
+        }
+
+        // Check if user is allowed to sign in
+        // Attempt to get Profile from OAuth provider details before invoking
+        // signIn callback - but if no user object is returned, that is fine
+        // (that just means it's a new user signing in for the first time).
+        let userOrProfile = profile
+        if (adapter) {
+          const { getUserByAccount } = adapter
+          const userByAccount = await getUserByAccount({
+            // @ts-expect-error
+            providerAccountId: account.providerAccountId,
+            provider: provider.id,
+          })
+
+          if (userByAccount) userOrProfile = userByAccount
+        }
+
+        try {
+          const isAllowed = await callbacks.signIn({
+            user: userOrProfile,
+            // @ts-expect-error
+            account,
+            profile: OAuthProfile,
+          })
+          if (!isAllowed) {
+            return { redirect: `${url}/error?error=AccessDenied`, cookies }
+          } else if (typeof isAllowed === "string") {
+            return { redirect: isAllowed, cookies }
+          }
+        } catch (error) {
+          return {
+            redirect: `${url}/error?error=${encodeURIComponent(
+              (error as Error).message
+            )}`,
+            cookies,
+          }
+        }
+
+        // Sign user in
+        // @ts-expect-error
+        const { user, session, isNewUser } = await callbackHandler({
+          sessionToken: sessionStore.value,
+          profile,
+          // @ts-expect-error
+          account,
+          options,
+        })
+
+        if (useJwtSession) {
+          const defaultToken = {
+            name: user.name,
+            email: user.email,
+            picture: user.image,
+            sub: user.id?.toString(),
+          }
+          const token = await callbacks.jwt({
+            token: defaultToken,
+            user,
+            // @ts-expect-error
+            account,
+            profile: OAuthProfile,
+            isNewUser,
+          })
+
+          // Encode token
+          const newToken = await jwt.encode({ ...jwt, token })
+
+          // Set cookie expiry date
+          const cookieExpires = new Date()
+          cookieExpires.setTime(cookieExpires.getTime() + sessionMaxAge * 1000)
+
+          const sessionCookies = sessionStore.chunk(newToken, {
+            expires: cookieExpires,
+          })
+          cookies.push(...sessionCookies)
+        } else {
+          // Save Session Token in cookie
+          cookies.push({
+            name: options.cookies.sessionToken.name,
+            value: session.sessionToken,
+            options: {
+              ...options.cookies.sessionToken.options,
+              expires: session.expires,
+            },
+          })
+        }
+
+        // @ts-expect-error
+        await events.signIn?.({ user, account, profile, isNewUser })
+
+        // Handle first logins on new accounts
+        // e.g. option to send users to a new account landing page on initial login
+        // Note that the callback URL is preserved, so the journey can still be resumed
+        if (isNewUser && pages.newUser) {
+          return {
+            redirect: `${pages.newUser}${
+              pages.newUser.includes("?") ? "&" : "?"
+            }callbackUrl=${encodeURIComponent(callbackUrl)}`,
+            cookies,
+          }
+        }
+
+        // Callback URL is already verified at this point, so safe to use if specified
+        return { redirect: callbackUrl, cookies }
+      } catch (error) {
+        if ((error as Error).name === "AccountNotLinkedError") {
+          // If the email on the account is already linked, but not with this OAuth account
+          return {
+            redirect: `${url}/error?error=OAuthAccountNotLinked`,
+            cookies,
+          }
+        } else if ((error as Error).name === "CreateUserError") {
+          return { redirect: `${url}/error?error=OAuthCreateAccount`, cookies }
+        }
+        logger.error("OAUTH_CALLBACK_HANDLER_ERROR", error as Error)
+        return { redirect: `${url}/error?error=Callback`, cookies }
+      }
+    } catch (error) {
+      if ((error as Error).name === "OAuthCallbackError") {
+        logger.error("CALLBACK_OAUTH_ERROR", error as Error)
+        return { redirect: `${url}/error?error=OAuthCallback`, cookies }
+      }
+      logger.error("OAUTH_CALLBACK_ERROR", error as Error)
+      return { redirect: `${url}/error?error=Callback`, cookies }
+    }
+  } else if (provider.type === "email") {
+    try {
+      // Verified in `assertConfig`
+      // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
+      const { useVerificationToken, getUserByEmail } = adapter!
+
+      const token = query?.token
+      const identifier = query?.email
+
+      const invite = await useVerificationToken?.({
+        identifier,
+        token: hashToken(token, options),
+      })
+
+      const invalidInvite = !invite || invite.expires.valueOf() < Date.now()
+      if (invalidInvite) {
+        return { redirect: `${url}/error?error=Verification`, cookies }
+      }
+
+      // If it is an existing user, use that, otherwise use a placeholder
+      const profile = (identifier
+        ? await getUserByEmail(identifier)
+        : null) ?? {
+        email: identifier,
+      }
+
+      /** @type {import("src").Account} */
+      const account = {
+        providerAccountId: profile.email,
+        type: "email",
+        provider: provider.id,
+      }
+
+      // Check if user is allowed to sign in
+      try {
+        const signInCallbackResponse = await callbacks.signIn({
+          // @ts-expect-error
+          user: profile,
+          // @ts-expect-error
+          account,
+          // @ts-expect-error
+          email: { email: identifier },
+        })
+        if (!signInCallbackResponse) {
+          return { redirect: `${url}/error?error=AccessDenied`, cookies }
+        } else if (typeof signInCallbackResponse === "string") {
+          return { redirect: signInCallbackResponse, cookies }
+        }
+      } catch (error) {
+        return {
+          redirect: `${url}/error?error=${encodeURIComponent(
+            (error as Error).message
+          )}`,
+          cookies,
+        }
+      }
+
+      // Sign user in
+      // @ts-expect-error
+      const { user, session, isNewUser } = await callbackHandler({
+        sessionToken: sessionStore.value,
+        // @ts-expect-error
+        profile,
+        // @ts-expect-error
+        account,
+        options,
+      })
+
+      if (useJwtSession) {
+        const defaultToken = {
+          name: user.name,
+          email: user.email,
+          picture: user.image,
+          sub: user.id?.toString(),
+        }
+        const token = await callbacks.jwt({
+          token: defaultToken,
+          user,
+          // @ts-expect-error
+          account,
+          isNewUser,
+        })
+
+        // Encode token
+        const newToken = await jwt.encode({ ...jwt, token })
+
+        // Set cookie expiry date
+        const cookieExpires = new Date()
+        cookieExpires.setTime(cookieExpires.getTime() + sessionMaxAge * 1000)
+
+        const sessionCookies = sessionStore.chunk(newToken, {
+          expires: cookieExpires,
+        })
+        cookies.push(...sessionCookies)
+      } else {
+        // Save Session Token in cookie
+        cookies.push({
+          name: options.cookies.sessionToken.name,
+          value: session.sessionToken,
+          options: {
+            ...options.cookies.sessionToken.options,
+            expires: session.expires,
+          },
+        })
+      }
+
+      // @ts-expect-error
+      await events.signIn?.({ user, account, isNewUser })
+
+      // Handle first logins on new accounts
+      // e.g. option to send users to a new account landing page on initial login
+      // Note that the callback URL is preserved, so the journey can still be resumed
+      if (isNewUser && pages.newUser) {
+        return {
+          redirect: `${pages.newUser}${
+            pages.newUser.includes("?") ? "&" : "?"
+          }callbackUrl=${encodeURIComponent(callbackUrl)}`,
+          cookies,
+        }
+      }
+
+      // Callback URL is already verified at this point, so safe to use if specified
+      return { redirect: callbackUrl, cookies }
+    } catch (error) {
+      if ((error as Error).name === "CreateUserError") {
+        return { redirect: `${url}/error?error=EmailCreateAccount`, cookies }
+      }
+      logger.error("CALLBACK_EMAIL_ERROR", error as Error)
+      return { redirect: `${url}/error?error=Callback`, cookies }
+    }
+  } else if (provider.type === "credentials" && method === "POST") {
+    const credentials = body
+
+    let user: User
+    try {
+      user = (await provider.authorize(credentials, {
+        query,
+        body,
+        headers,
+        method,
+      })) as User
+      if (!user) {
+        return {
+          status: 401,
+          redirect: `${url}/error?${new URLSearchParams({
+            error: "CredentialsSignin",
+            provider: provider.id,
+          })}`,
+          cookies,
+        }
+      }
+    } catch (error) {
+      return {
+        redirect: `${url}/error?error=${encodeURIComponent(
+          (error as Error).message
+        )}`,
+        cookies,
+      }
+    }
+
+    /** @type {import("src").Account} */
+    const account = {
+      providerAccountId: user.id,
+      type: "credentials",
+      provider: provider.id,
+    }
+
+    try {
+      const isAllowed = await callbacks.signIn({
+        user,
+        // @ts-expect-error
+        account,
+        credentials,
+      })
+      if (!isAllowed) {
+        return {
+          status: 403,
+          redirect: `${url}/error?error=AccessDenied`,
+          cookies,
+        }
+      } else if (typeof isAllowed === "string") {
+        return { redirect: isAllowed, cookies }
+      }
+    } catch (error) {
+      return {
+        redirect: `${url}/error?error=${encodeURIComponent(
+          (error as Error).message
+        )}`,
+        cookies,
+      }
+    }
+
+    const defaultToken = {
+      name: user.name,
+      email: user.email,
+      picture: user.image,
+      sub: user.id?.toString(),
+    }
+
+    const token = await callbacks.jwt({
+      token: defaultToken,
+      user,
+      // @ts-expect-error
+      account,
+      isNewUser: false,
+    })
+
+    // Encode token
+    const newToken = await jwt.encode({ ...jwt, token })
+
+    // Set cookie expiry date
+    const cookieExpires = new Date()
+    cookieExpires.setTime(cookieExpires.getTime() + sessionMaxAge * 1000)
+
+    const sessionCookies = sessionStore.chunk(newToken, {
+      expires: cookieExpires,
+    })
+
+    cookies.push(...sessionCookies)
+
+    // @ts-expect-error
+    await events.signIn?.({ user, account })
+
+    return { redirect: callbackUrl, cookies }
+  }
+  return {
+    status: 500,
+    body: `Error: Callback for provider type ${provider.type} not supported`,
+    cookies,
+  }
+}

src/core/routes/providers.ts

@@ -0,0 +1,30 @@
+import { OutgoingResponse } from ".."
+import { InternalProvider } from "../../lib/types"
+
+export interface PublicProvider {
+  id: string
+  name: string
+  type: string
+  signinUrl: string
+  callbackUrl: string
+}
+
+/**
+ * Return a JSON object with a list of all OAuth providers currently configured
+ * and their signin and callback URLs. This makes it possible to automatically
+ * generate buttons for all providers when rendering client side.
+ */
+export default function providers(
+  providers: InternalProvider[]
+): OutgoingResponse<Record<string, PublicProvider>> {
+  return {
+    headers: [{ key: "Content-Type", value: "application/json" }],
+    body: providers.reduce<Record<string, PublicProvider>>(
+      (acc, { id, name, type, signinUrl, callbackUrl }) => {
+        acc[id] = { id, name, type, signinUrl, callbackUrl }
+        return acc
+      },
+      {}
+    ),
+  }
+}

src/core/routes/session.ts

@@ -0,0 +1,167 @@
+import { fromDate } from "../lib/utils"
+
+import type { Adapter } from "../../adapters"
+import type { InternalOptions } from "../../lib/types"
+import type { OutgoingResponse } from ".."
+import type { Session } from "../.."
+import type { SessionStore } from "../lib/cookie"
+
+interface SessionParams {
+  options: InternalOptions
+  sessionStore: SessionStore
+}
+
+/**
+ * Return a session object (without any private fields)
+ * for Single Page App clients
+ */
+
+export default async function session(
+  params: SessionParams
+): Promise<OutgoingResponse<Session | {}>> {
+  const { options, sessionStore } = params
+  const {
+    adapter,
+    jwt,
+    events,
+    callbacks,
+    logger,
+    session: { strategy: sessionStrategy, maxAge: sessionMaxAge },
+  } = options
+
+  const response: OutgoingResponse<Session | {}> = {
+    body: {},
+    headers: [{ key: "Content-Type", value: "application/json" }],
+    cookies: [],
+  }
+
+  const sessionToken = sessionStore.value
+
+  if (!sessionToken) return response
+
+  if (sessionStrategy === "jwt") {
+    try {
+      const decodedToken = await jwt.decode({
+        ...jwt,
+        token: sessionToken,
+      })
+
+      const newExpires = fromDate(sessionMaxAge)
+
+      // By default, only exposes a limited subset of information to the client
+      // as needed for presentation purposes (e.g. "you are logged in as...").
+      const session = {
+        user: {
+          name: decodedToken?.name,
+          email: decodedToken?.email,
+          image: decodedToken?.picture,
+        },
+        expires: newExpires.toISOString(),
+      }
+
+      // @ts-expect-error
+      const token = await callbacks.jwt({ token: decodedToken })
+      // @ts-expect-error
+      const newSession = await callbacks.session({ session, token })
+
+      // Return session payload as response
+      response.body = newSession
+
+      // Refresh JWT expiry by re-signing it, with an updated expiry date
+      const newToken = await jwt.encode({
+        ...jwt,
+        token,
+        maxAge: options.session.maxAge,
+      })
+
+      // Set cookie, to also update expiry date on cookie
+      const sessionCookies = sessionStore.chunk(newToken, {
+        expires: newExpires,
+      })
+
+      response.cookies?.push(...sessionCookies)
+
+      await events.session?.({ session: newSession, token })
+    } catch (error) {
+      // If JWT not verifiable, make sure the cookie for it is removed and return empty object
+      logger.error("JWT_SESSION_ERROR", error as Error)
+
+      response.cookies?.push(...sessionStore.clean())
+    }
+  } else {
+    try {
+      const { getSessionAndUser, deleteSession, updateSession } =
+        adapter as Adapter
+      let userAndSession = await getSessionAndUser(sessionToken)
+
+      // If session has expired, clean up the database
+      if (
+        userAndSession &&
+        userAndSession.session.expires.valueOf() < Date.now()
+      ) {
+        await deleteSession(sessionToken)
+        userAndSession = null
+      }
+
+      if (userAndSession) {
+        const { user, session } = userAndSession
+
+        const sessionUpdateAge = options.session.updateAge
+        // Calculate last updated date to throttle write updates to database
+        // Formula: ({expiry date} - sessionMaxAge) + sessionUpdateAge
+        //     e.g. ({expiry date} - 30 days) + 1 hour
+        const sessionIsDueToBeUpdatedDate =
+          session.expires.valueOf() -
+          sessionMaxAge * 1000 +
+          sessionUpdateAge * 1000
+
+        const newExpires = fromDate(sessionMaxAge)
+        // Trigger update of session expiry date and write to database, only
+        // if the session was last updated more than {sessionUpdateAge} ago
+        if (sessionIsDueToBeUpdatedDate <= Date.now()) {
+          await updateSession({ sessionToken, expires: newExpires })
+        }
+
+        // Pass Session through to the session callback
+        // @ts-expect-error
+        const sessionPayload = await callbacks.session({
+          // By default, only exposes a limited subset of information to the client
+          // as needed for presentation purposes (e.g. "you are logged in as...").
+          session: {
+            user: {
+              name: user.name,
+              email: user.email,
+              image: user.image,
+            },
+            expires: session.expires.toISOString(),
+          },
+          user,
+        })
+
+        // Return session payload as response
+        response.body = sessionPayload
+
+        // Set cookie again to update expiry
+        response.cookies?.push({
+          name: options.cookies.sessionToken.name,
+          value: sessionToken,
+          options: {
+            ...options.cookies.sessionToken.options,
+            expires: newExpires,
+          },
+        })
+
+        // @ts-expect-error
+        await events.session?.({ session: sessionPayload })
+      } else if (sessionToken) {
+        // If `sessionToken` was found set but it's not valid for a session then
+        // remove the sessionToken cookie from browser.
+        response.cookies?.push(...sessionStore.clean())
+      }
+    } catch (error) {
+      logger.error("SESSION_ERROR", error as Error)
+    }
+  }
+
+  return response
+}

src/core/routes/signin.ts

@@ -0,0 +1,92 @@
+import getAuthorizationUrl from "../lib/oauth/authorization-url"
+import emailSignin from "../lib/email/signin"
+import { IncomingRequest, OutgoingResponse } from ".."
+import { InternalOptions } from "../../lib/types"
+import { Account, User } from "../.."
+
+/** Handle requests to /api/auth/signin */
+export default async function signin(params: {
+  options: InternalOptions<"oauth" | "email">
+  query: IncomingRequest["query"]
+  body: IncomingRequest["body"]
+}): Promise<OutgoingResponse> {
+  const { options, query, body } = params
+  const { url, adapter, callbacks, logger, provider } = options
+
+  if (!provider.type) {
+    return {
+      status: 500,
+      // @ts-expect-error
+      text: `Error: Type not specified for ${provider.name}`,
+    }
+  }
+
+  if (provider.type === "oauth") {
+    try {
+      const response = await getAuthorizationUrl({ options, query })
+      return response
+    } catch (error) {
+      logger.error("SIGNIN_OAUTH_ERROR", { error: error as Error, provider })
+      return { redirect: `${url}/error?error=OAuthSignin` }
+    }
+  } else if (provider.type === "email") {
+    // Note: Technically the part of the email address local mailbox element
+    // (everything before the @ symbol) should be treated as 'case sensitive'
+    // according to RFC 2821, but in practice this causes more problems than
+    // it solves. We treat email addresses as all lower case. If anyone
+    // complains about this we can make strict RFC 2821 compliance an option.
+    const email = body?.email?.toLowerCase() ?? null
+
+    // Verified in `assertConfig`
+    // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
+    const { getUserByEmail } = adapter!
+    // If is an existing user return a user object (otherwise use placeholder)
+    const user: User = (email ? await getUserByEmail(email) : null) ?? {
+      email,
+      id: email,
+    }
+
+    const account: Account = {
+      providerAccountId: email,
+      userId: email,
+      type: "email",
+      provider: provider.id,
+    }
+
+    // Check if user is allowed to sign in
+    try {
+      // @ts-expect-error
+      const signInCallbackResponse = await callbacks.signIn({
+        user,
+        account,
+        email: { verificationRequest: true },
+      })
+      if (!signInCallbackResponse) {
+        return { redirect: `${url}/error?error=AccessDenied` }
+      } else if (typeof signInCallbackResponse === "string") {
+        return { redirect: signInCallbackResponse }
+      }
+    } catch (error) {
+      return {
+        redirect: `${url}/error?${new URLSearchParams({
+          error: error as string,
+        })}}`,
+      }
+    }
+
+    try {
+      await emailSignin(email, options)
+    } catch (error) {
+      logger.error("SIGNIN_EMAIL_ERROR", error as Error)
+      return { redirect: `${url}/error?error=EmailSignin` }
+    }
+
+    const params = new URLSearchParams({
+      provider: provider.id,
+      type: provider.type,
+    })
+
+    return { redirect: `${url}/verify-request?${params}` }
+  }
+  return { redirect: `${url}/signin` }
+}

src/core/routes/signout.ts

@@ -0,0 +1,45 @@
+import type { Adapter } from "../../adapters"
+import type { InternalOptions } from "../../lib/types"
+import type { OutgoingResponse } from ".."
+import type { SessionStore } from "../lib/cookie"
+
+/** Handle requests to /api/auth/signout */
+export default async function signout(params: {
+  options: InternalOptions
+  sessionStore: SessionStore
+}): Promise<OutgoingResponse> {
+  const { options, sessionStore } = params
+  const { adapter, events, jwt, callbackUrl, logger, session } = options
+
+  const sessionToken = sessionStore?.value
+  if (!sessionToken) {
+    return { redirect: callbackUrl }
+  }
+
+  if (session.strategy === "jwt") {
+    // Dispatch signout event
+    try {
+      const decodedJwt = await jwt.decode({ ...jwt, token: sessionToken })
+      // @ts-expect-error
+      await events.signOut?.({ token: decodedJwt })
+    } catch (error) {
+      // Do nothing if decoding the JWT fails
+      logger.error("SIGNOUT_ERROR", error)
+    }
+  } else {
+    try {
+      const session = await (adapter as Adapter).deleteSession(sessionToken)
+      // Dispatch signout event
+      // @ts-expect-error
+      await events.signOut?.({ session })
+    } catch (error) {
+      // If error, log it but continue
+      logger.error("SIGNOUT_ERROR", error as Error)
+    }
+  }
+
+  // Remove Session Token
+  const sessionCookies = sessionStore.clean()
+
+  return { redirect: callbackUrl, cookies: sessionCookies }
+}

src/core/types.ts

@@ -1,17 +1,13 @@
-// Minimum TypeScript Version: 3.6
+import type { Adapter } from "../adapters"
+import type { Provider, CredentialInput, ProviderType } from "../providers"
+import type { TokenSetParameters } from "openid-client"
+import type { JWT, JWTOptions } from "../jwt"
+import type { LoggerInstance } from "../lib/logger"
+import type { CookieSerializeOptions } from "cookie"
 
-/// <reference types="node" />
+export type Awaitable<T> = T | PromiseLike<T>
 
-import { ConnectionOptions } from "typeorm"
-import { Adapter } from "./adapters"
-import { JWTOptions, JWT } from "./jwt"
-import { AppProviders } from "./providers"
-import {
-  Awaitable,
-  NextApiRequest,
-  NextApiResponse,
-  NextApiHandler,
-} from "./internals/utils"
+export type { LoggerInstance }
 
 /**
  * Configure your NextAuth instance
@@ -28,15 +24,7 @@ export interface NextAuthOptions {
    *
    * [Documentation](https://next-auth.js.org/configuration/options#providers) | [Providers documentation](https://next-auth.js.org/configuration/providers)
    */
-  providers: AppProviders
-  /**
-   * A database connection string or configuration object.
-   * * **Default value**: `null`
-   * * **Required**: *No (unless using email provider)*
-   *
-   * [Documentation](https://next-auth.js.org/configuration/options#database) | [Databases](https://next-auth.js.org/configuration/databases)
-   */
-  database?: string | Record<string, any> | ConnectionOptions
+  providers: Provider[]
   /**
    * A random string used to hash tokens, sign cookies and generate cryptographic keys.
    * If not specified is uses a hash of all configuration options, including Client ID / Secrets for entropy.
@@ -56,7 +44,7 @@ export interface NextAuthOptions {
    *
    * [Documentation](https://next-auth.js.org/configuration/options#session)
    */
-  session?: SessionOptions
+  session?: Partial<SessionOptions>
   /**
    * JSON Web Tokens can be used for session tokens if enabled with the `session: { jwt: true }` option.
    * JSON Web Tokens are enabled by default if you have not specified a database.
@@ -68,7 +56,7 @@ export interface NextAuthOptions {
    *
    * [Documentation](https://next-auth.js.org/configuration/options#jwt)
    */
-  jwt?: JWTOptions
+  jwt?: Partial<JWTOptions>
   /**
    * Specify URLs to be used if you want to create custom sign in, sign out and error pages.
    * Pages specified will override the corresponding built-in page.
@@ -88,7 +76,7 @@ export interface NextAuthOptions {
    *
    * [Documentation](https://next-auth.js.org/configuration/options#pages) | [Pages documentation](https://next-auth.js.org/configuration/pages)
    */
-  pages?: PagesOptions
+  pages?: Partial<PagesOptions>
   /**
    * Callbacks are asynchronous functions you can use to control what happens when an action is performed.
    * Callbacks are *extremely powerful*, especially in scenarios involving JSON Web Tokens
@@ -98,7 +86,7 @@ export interface NextAuthOptions {
    *
    * [Documentation](https://next-auth.js.org/configuration/options#callbacks) | [Callbacks documentation](https://next-auth.js.org/configuration/callbacks)
    */
-  callbacks?: CallbacksOptions
+  callbacks?: Partial<CallbacksOptions>
   /**
    * Events are asynchronous functions that do not return a response, they are useful for audit logging.
    * You can specify a handler for any of these events below - e.g. for debugging or to create an audit log.
@@ -111,23 +99,16 @@ export interface NextAuthOptions {
    *
    * [Documentation](https://next-auth.js.org/configuration/options#events) | [Events documentation](https://next-auth.js.org/configuration/events)
    */
-  events?: Partial<JWTEventCallbacks | SessionEventCallbacks>
+  events?: Partial<EventCallbacks>
   /**
-   * By default NextAuth.js uses a database adapter that uses TypeORM and supports MySQL, MariaDB, Postgres and MongoDB and SQLite databases.
-   * An alternative adapter that uses Prisma, which currently supports MySQL, MariaDB and Postgres, is also included.
-   * You can use the adapter option to use the Prisma adapter - or pass in your own adapter
-   * if you want to use a database that is not supported by one of the built-in adapters.
-   * * **Default value**: TypeORM adapter
+   * You can use the adapter option to pass in your database adapter.
+   *
    * * **Required**: *No*
    *
-   * - ⚠ If the `adapter` option is specified it overrides the `database` option, only specify one or the other.
-   * - ⚠ Adapters are being migrated to their own home in a Community maintained repository.
-   *
    * [Documentation](https://next-auth.js.org/configuration/options#adapter) |
-   * [Default adapter](https://next-auth.js.org/schemas/adapters#typeorm-adapter) |
    * [Community adapters](https://github.com/nextauthjs/adapters)
    */
-  adapter?: ReturnType<Adapter>
+  adapter?: Adapter
   /**
    * Set debug to true to enable debug messages for authentication and database operations.
    * * **Default value**: `false`
@@ -169,7 +150,7 @@ export interface NextAuthOptions {
    * [Documentation](https://next-auth.js.org/configuration/options#logger) |
    * [Debug documentation](https://next-auth.js.org/configuration/options#debug)
    */
-  logger?: LoggerInstance
+  logger?: Partial<LoggerInstance>
   /**
    * Changes the theme of pages.
    * Set to `"light"` if you want to force pages to always be light.
@@ -212,7 +193,7 @@ export interface NextAuthOptions {
    *
    * [Documentation](https://next-auth.js.org/configuration/options#cookies) | [Usage example](https://next-auth.js.org/configuration/options#example)
    */
-  cookies?: CookiesOptions
+  cookies?: Partial<CookiesOptions>
 }
 
 /**
@@ -221,17 +202,10 @@ export interface NextAuthOptions {
  * [Documentation](https://next-auth.js.org/configuration/options#theme) |
  * [Pages](https://next-auth.js.org/configuration/pages)
  */
-export type Theme = "auto" | "dark" | "light"
-
-/**
- * Override any of the methods, and the rest will use the default logger.
- *
- * [Documentation](https://next-auth.js.org/configuration/options#logger)
- */
-export interface LoggerInstance {
-  warn(code: string, ...message: unknown[]): void
-  error(code: string, ...message: unknown[]): void
-  debug(code: string, ...message: unknown[]): void
+export interface Theme {
+  colorScheme: "auto" | "dark" | "light"
+  logo?: string
+  brandColor?: string
 }
 
 /**
@@ -239,28 +213,30 @@ export interface LoggerInstance {
  * Some of them are available with different casing,
  * but they refer to the same value.
  */
-export interface TokenSet {
-  accessToken: string
-  /** Kept for historical reasons, check out `expires_in` */
-  accessTokenExpires: null
-  idToken?: string
-  refreshToken?: string
-  access_token: string
-  expires_in?: number | null
-  refresh_token?: string
-  id_token?: string
-}
+export type TokenSet = TokenSetParameters
 
 /**
  * Usually contains information about the provider being used
  * and also extends `TokenSet`, which is different tokens returned by OAuth Providers.
  */
-export interface Account extends TokenSet, Record<string, unknown> {
-  id: string
+export interface DefaultAccount extends Partial<TokenSet> {
+  /**
+   * This value depends on the type of the provider being used to create the account.
+   * - oauth: The OAuth account's id, returned from the `profile()` callback.
+   * - email: The user's email address.
+   * - credentials: `id` returned from the `authorize()` callback
+   */
+  providerAccountId: string
+  /** id of the user this account belongs to. */
+  userId: string
+  /** id of the provider used for this account */
   provider: string
-  type: string
+  /** Provider's type for this account */
+  type: ProviderType
 }
 
+export interface Account extends Record<string, unknown>, DefaultAccount {}
+
 export interface DefaultProfile {
   sub?: string
   name?: string
@@ -283,7 +259,28 @@ export interface CallbacksOptions<
    *
    * [Documentation](https://next-auth.js.org/configuration/callbacks#sign-in-callback)
    */
-  signIn?(user: User, account: A, profile: P): Awaitable<string | boolean>
+  signIn: (params: {
+    user: User
+    account: A
+    /**
+     * If OAuth provider is used, it contains the full
+     * OAuth profile returned by your provider.
+     */
+    profile: P & Record<string, unknown>
+    /**
+     * If Email provider is used, on the first call, it contains a
+     * `verificationRequest: true` property to indicate it is being triggered in the verification request flow.
+     * When the callback is invoked after a user has clicked on a sign in link,
+     * this property will not be present. You can check for the `verificationRequest` property
+     * to avoid sending emails to addresses or domains on a blocklist or to only explicitly generate them
+     * for email address in an allow list.
+     */
+    email: {
+      verificationRequest?: boolean
+    }
+    /** If Credentials provider is used, it contains the user credentials */
+    credentials?: Record<string, CredentialInput>
+  }) => Awaitable<string | boolean>
   /**
    * This callback is called anytime the user is redirected to a callback URL (e.g. on signin or signout).
    * By default only URLs on the same URL as the site are allowed,
@@ -291,12 +288,19 @@ export interface CallbacksOptions<
    *
    * [Documentation](https://next-auth.js.org/configuration/callbacks#redirect-callback)
    */
-  redirect?(url: string, baseUrl: string): Awaitable<string>
+  redirect: (params: {
+    /** URL provided as callback URL by the client */
+    url: string
+    /** Default base URL of site (can be used as fallback) */
+    baseUrl: string
+  }) => Awaitable<string>
   /**
    * This callback is called whenever a session is checked.
    * (Eg.: invoking the `/api/session` endpoint, using `useSession` or `getSession`)
    *
-   * - ⚠ By default, only a subset of the token is returned for increased security.
+   * ⚠ By default, only a subset (email, name, image)
+   * of the token is returned for increased security.
+   *
    * If you want to make something available you added to the token through the `jwt` callback,
    * you have to explicitely forward it here to make it available to the client.
    *
@@ -306,7 +310,11 @@ export interface CallbacksOptions<
    * [`getSession`](https://next-auth.js.org/getting-started/client#getsession) |
    *
    */
-  session?(session: Session, userOrToken: JWT | User): Awaitable<Session>
+  session: (params: {
+    session: Session
+    user: User
+    token: JWT
+  }) => Awaitable<Session>
   /**
    * This callback is called whenever a JSON Web Token is created (i.e. at sign in)
    * or updated (i.e whenever a session is accessed in the client).
@@ -314,137 +322,139 @@ export interface CallbacksOptions<
    * where you can control what should be returned to the client.
    * Anything else will be kept from your front-end.
    *
-   * - ⚠ By default the JWT is signed, but not encrypted.
+   * ⚠ By default the JWT is signed, but not encrypted.
    *
    * [Documentation](https://next-auth.js.org/configuration/callbacks#jwt-callback) |
    * [`session` callback](https://next-auth.js.org/configuration/callbacks#session-callback)
    */
-  jwt?(
-    token: JWT,
-    user?: User,
-    account?: A,
-    profile?: P,
+  jwt: (params: {
+    token: JWT
+    user?: User
+    account?: A
+    profile?: P
     isNewUser?: boolean
-  ): Awaitable<JWT>
+  }) => Awaitable<JWT>
 }
 
 /** [Documentation](https://next-auth.js.org/configuration/options#cookies) */
 export interface CookieOption {
   name: string
-  options: {
-    httpOnly: boolean
-    sameSite: true | "strict" | "lax" | "none"
-    path?: string
-    secure: boolean
-    maxAge?: number
-    domain?: string
-  }
+  options: CookieSerializeOptions
 }
 
 /** [Documentation](https://next-auth.js.org/configuration/options#cookies) */
 export interface CookiesOptions {
-  sessionToken?: CookieOption
-  callbackUrl?: CookieOption
-  csrfToken?: CookieOption
-  pkceCodeVerifier?: CookieOption
-}
-
-/** [Documentation](https://next-auth.js.org/configuration/events) */
-export type EventCallback<MessageType = unknown> = (
-  message: MessageType
-) => Promise<void>
-
-/**
- * If using a `credentials` type auth, the user is the raw response from your
- * credential provider.
- * For other providers, you'll get the User object from your adapter, the account,
- * and an indicator if the user was new to your Adapter.
- */
-export interface SignInEventMessage {
-  user: User
-  account: Account
-  isNewUser?: boolean
-}
-
-export interface LinkAccountEventMessage {
-  user: User
-  providerAccount: Record<string, unknown>
+  sessionToken: CookieOption
+  callbackUrl: CookieOption
+  csrfToken: CookieOption
+  pkceCodeVerifier: CookieOption
+  state: CookieOption
 }
 
 /**
- * The various event callbacks you can register for from next-auth
+ *  The various event callbacks you can register for from next-auth
+ *
+ * [Documentation](https://next-auth.js.org/configuration/events)
  */
-export interface CommonEventCallbacks {
-  signIn: EventCallback<SignInEventMessage>
-  createUser: EventCallback<User>
-  updateUser: EventCallback<User>
-  linkAccount: EventCallback<LinkAccountEventMessage>
-  error: EventCallback
+export interface EventCallbacks {
+  /**
+   * If using a `credentials` type auth, the user is the raw response from your
+   * credential provider.
+   * For other providers, you'll get the User object from your adapter, the account,
+   * and an indicator if the user was new to your Adapter.
+   */
+  signIn: (message: {
+    user: User
+    account: Account
+    profile?: Profile
+    isNewUser?: boolean
+  }) => Awaitable<void>
+  /**
+   * The message object will contain one of these depending on
+   * if you use JWT or database persisted sessions:
+   * - `token`: The JWT token for this session.
+   * - `session`: The session object from your adapter that is being ended.
+   */
+  signOut: (message: { session: Session; token: JWT }) => Awaitable<void>
+  createUser: (message: { user: User }) => Awaitable<void>
+  updateUser: (message: { user: User }) => Awaitable<void>
+  linkAccount: (message: { user: User; account: Account }) => Awaitable<void>
+  /**
+   * The message object will contain one of these depending on
+   * if you use JWT or database persisted sessions:
+   * - `token`: The JWT token for this session.
+   * - `session`: The session object from your adapter.
+   */
+  session: (message: { session: Session; token: JWT }) => Awaitable<void>
 }
-/**
- * The event callbacks will take this form if you are using JWTs:
- * signOut will receive the JWT and session will receive the session and JWT.
- */
-export interface JWTEventCallbacks extends CommonEventCallbacks {
-  signOut: EventCallback<JWT>
-  session: EventCallback<{
-    session: Session
-    jwt: JWT
-  }>
-}
-/**
- * The event callbacks will take this form if you are using Sessions
- * and not using JWTs:
- * signOut will receive the underlying DB adapter's session object, and session
- * will receive the NextAuth client session with extra data.
- */
-export interface SessionEventCallbacks extends CommonEventCallbacks {
-  signOut: EventCallback<Session | null>
-  session: EventCallback<{ session: Session }>
-}
-export type EventCallbacks = JWTEventCallbacks | SessionEventCallbacks
 
 export type EventType = keyof EventCallbacks
 
 /** [Documentation](https://next-auth.js.org/configuration/pages) */
 export interface PagesOptions {
-  signIn?: string
-  signOut?: string
+  signIn: string
+  signOut: string
   /** Error code passed in query string as ?error= */
-  error?: string
-  verifyRequest?: string
+  error: string
+  verifyRequest: string
   /** If set, new users will be directed here on first sign in */
-  newUser?: string
+  newUser: string
 }
 
+export type ISODateString = string
+
 export interface DefaultSession extends Record<string, unknown> {
   user?: {
     name?: string | null
     email?: string | null
     image?: string | null
   }
-  expires?: string
+  expires: ISODateString
 }
 
 /**
  * Returned by `useSession`, `getSession`, returned by the `session` callback
- * and also the shape received as a prop on the `Provider` React Context
+ * and also the shape received as a prop on the `SessionProvider` React Context
  *
  * [`useSession`](https://next-auth.js.org/getting-started/client#usesession) |
  * [`getSession`](https://next-auth.js.org/getting-started/client#getsession) |
- * [`Provider`](https://next-auth.js.org/getting-started/client#provider) |
+ * [`SessionProvider`](https://next-auth.js.org/getting-started/client#sessionprovider) |
  * [`session` callback](https://next-auth.js.org/configuration/callbacks#jwt-callback)
  */
 export interface Session extends Record<string, unknown>, DefaultSession {}
 
+export type SessionStrategy = "jwt" | "database"
+
 /** [Documentation](https://next-auth.js.org/configuration/options#session) */
 export interface SessionOptions {
-  jwt?: boolean
-  maxAge?: number
-  updateAge?: number
+  /**
+   * Choose how you want to save the user session.
+   * The default is `"jwt"`, an encrypted JWT (JWE) in the session cookie.
+   *
+   * If you use an `adapter` however, we default it to `"database"` instead.
+   * You can still force a JWT session by explicitly defining `"jwt"`.
+   *
+   * When using `"database"`, the session cookie will only contain a `sessionToken` value,
+   * which is used to look up the session in the database.
+   *
+   * [Documentation](https://next-auth.js.org/configuration/options#session) | [Adapter](https://next-auth.js.org/configuration/options#adapter) | [About JSON Web Tokens](https://next-auth.js.org/faq#json-web-tokens)
+   */
+  strategy: SessionStrategy
+  /**
+   * Relative time from now in seconds when to expire the session
+   * @default 2592000 // 30 days
+   */
+  maxAge: number
+  /**
+   * How often the session should be updated in seconds.
+   * If set to `0`, session is updated every time.
+   * @default 86400 // 1 day
+   */
+  updateAge: number
 }
 
 export interface DefaultUser {
+  id: string
   name?: string | null
   email?: string | null
   image?: string | null
@@ -461,13 +471,3 @@ export interface DefaultUser {
  * [`profile` OAuth provider callback](https://next-auth.js.org/configuration/providers#using-a-custom-provider)
  */
 export interface User extends Record<string, unknown>, DefaultUser {}
-
-declare function NextAuth(
-  req: NextApiRequest,
-  res: NextApiResponse,
-  options: NextAuthOptions
-): ReturnType<NextApiHandler>
-
-declare function NextAuth(options: NextAuthOptions): ReturnType<NextApiHandler>
-
-export default NextAuth

src/css/index.css

@@ -1,6 +1,6 @@
 :root {
   --border-width: 1px;
-  --border-radius: .3rem;
+  --border-radius: 0.3rem;
   --color-error: #c94b4b;
   --color-info: #157efb;
   --color-info-text: #fff;
@@ -43,7 +43,9 @@ body {
   background-color: var(--color-background);
   margin: 0;
   padding: 0;
-  font-family: -apple-system, Segoe UI, Roboto, Ubuntu, Cantarell, Noto Sans, sans-serif, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif, 'Apple Color Emoji', 'Segoe UI Emoji', 'Segoe UI Symbol';
+  font-family: -apple-system, Segoe UI, Roboto, Ubuntu, Cantarell, Noto Sans,
+    sans-serif, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif,
+    "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
 }
 
 h1 {
@@ -54,7 +56,7 @@ h1 {
 }
 
 p {
-  color: var(--color-text)
+  color: var(--color-text);
 }
 
 form {
@@ -67,19 +69,19 @@ label {
   text-align: left;
   margin-bottom: 0.25rem;
   display: block;
-  color: #666;
+  color: var(--color-text);
 }
 
 input[type] {
   box-sizing: border-box;
   display: block;
   width: 100%;
-  padding: .5rem 1rem;
+  padding: 0.5rem 1rem;
   border: var(--border-width) solid var(--color-control-border);
   background: var(--color-background);
   font-size: 1rem;
   border-radius: var(--border-radius);
-  box-shadow: inset 0 .1rem .2rem rgba(0, 0, 0, .2);
+  box-shadow: inset 0 0.1rem 0.2rem rgba(0, 0, 0, 0.2);
   color: var(--color-text);
 
   &:focus {
@@ -107,15 +109,17 @@ a.button {
 
 button,
 a.button {
-  margin: 0 0 .75rem 0;
-  padding: .75rem 1rem;
+  margin: 0 0 0.75rem 0;
+  padding: 0.75rem 1rem;
   border: var(--border-width) solid var(--color-control-border);
   color: var(--color-primary);
   background-color: var(--color-background);
   font-size: 1rem;
   border-radius: var(--border-radius);
-  transition: all .1s ease-in-out;
-  box-shadow: 0 0.15rem 0.3rem rgba(0, 0, 0, .15), inset 0 .1rem .2rem var(--color-background), inset 0 -.1rem .1rem rgba(0, 0, 0, .05);
+  transition: all 0.1s ease-in-out;
+  box-shadow: 0 0.15rem 0.3rem rgba(0, 0, 0, 0.15),
+    inset 0 0.1rem 0.2rem var(--color-background),
+    inset 0 -0.1rem 0.1rem rgba(0, 0, 0, 0.05);
   font-weight: 500;
   position: relative;
 
@@ -124,7 +128,9 @@ a.button {
   }
 
   &:active {
-    box-shadow: 0 0.15rem 0.3rem rgba(0, 0, 0, .15), inset 0 .1rem .2rem var(--color-background), inset 0 -.1rem .1rem rgba(0, 0, 0, .1);
+    box-shadow: 0 0.15rem 0.3rem rgba(0, 0, 0, 0.15),
+      inset 0 0.1rem 0.2rem var(--color-background),
+      inset 0 -0.1rem 0.1rem rgba(0, 0, 0, 0.1);
     background-color: var(--color-button-active-background);
     border-color: var(--color-button-active-border);
     cursor: pointer;
@@ -146,13 +152,12 @@ a.site {
   position: absolute;
   width: 100%;
   height: 100%;
-  display: table;
+  display: grid;
+  place-items: center;
   margin: 0;
   padding: 0;
 
-  >div {
-    display: table-cell;
-    vertical-align: middle;
+  > div {
     text-align: center;
     padding: 0.5rem;
   }
@@ -163,7 +168,7 @@ a.site {
     display: inline-block;
     padding-left: 2rem;
     padding-right: 2rem;
-    margin-top: .5rem;
+    margin-top: 0.5rem;
   }
 
   .message {
@@ -172,7 +177,6 @@ a.site {
 }
 
 .signin {
-
   button,
   a.button,
   input[type="text"] {
@@ -192,9 +196,9 @@ a.site {
       content: "or";
       background: var(--color-background);
       color: #888;
-      padding: 0 .4rem;
+      padding: 0 0.4rem;
       position: relative;
-      top: -.6rem;
+      top: -0.6rem;
     }
   }
 
@@ -213,10 +217,9 @@ a.site {
     }
   }
 
-  >div,
+  > div,
   form {
     display: block;
-    margin: 0 auto 0.5rem auto;
 
     input[type] {
       margin-bottom: 0.5rem;
@@ -228,4 +231,32 @@ a.site {
 
     max-width: 300px;
   }
-}
+}
+.signout {
+  .message {
+    margin-bottom: 1.5rem;
+  }
+}
+
+.logo {
+  display: inline-block;
+  margin-top: 100px;
+  max-width: 300px;
+  max-height: 150px;
+}
+
+.card {
+  max-width: max-content;
+  border: 1px solid var(--color-control-border);
+  border-radius: 5px;
+  padding: 20px 50px;
+  margin: 50px auto;
+
+  .header {
+    color: var(--color-primary);
+  }
+}
+
+.section-header {
+  color: var(--brand-color, var(--color-text));
+}

src/css/index.ts

@@ -1,11 +1,11 @@
 // To support serverless targets (which don't work if you try to read in things
 // like CSS files at run time) this file is replaced in production builds with
 // a function that returns compiled CSS (embedded as a string in the function).
-import fs from 'fs'
-import path from 'path'
+import fs from "fs"
+import path from "path"
 
-const pathToCss = path.join(process.cwd(), '/dist/css/index.css')
+const pathToCss = path.join(process.cwd(), "/src/css/index.css")
 
-export default function css () {
-  return fs.readFileSync(pathToCss, 'utf8')
+export default function css() {
+  return fs.readFileSync(pathToCss, "utf8")
 }

src/index.ts

@@ -0,0 +1,6 @@
+export * from "./core/types"
+
+export type { IncomingRequest, OutgoingResponse } from "./core"
+
+export * from "./next"
+export { default } from "./next"

src/jwt/index.ts

@@ -0,0 +1,115 @@
+import { EncryptJWT, jwtDecrypt } from "jose"
+import hkdf from "@panva/hkdf"
+import { v4 as uuid } from "uuid"
+import { SessionStore } from "../core/lib/cookie"
+import type { NextApiRequest } from "next"
+import type { JWT, JWTDecodeParams, JWTEncodeParams, JWTOptions } from "./types"
+import type { LoggerInstance } from ".."
+
+export * from "./types"
+
+const DEFAULT_MAX_AGE = 30 * 24 * 60 * 60 // 30 days
+
+const now = () => (Date.now() / 1000) | 0
+
+/** Issues a JWT. By default, the JWT is encrypted using "A256GCM". */
+export async function encode({
+  token = {},
+  secret,
+  maxAge = DEFAULT_MAX_AGE,
+}: JWTEncodeParams) {
+  const encryptionSecret = await getDerivedEncryptionKey(secret)
+  return await new EncryptJWT(token)
+    .setProtectedHeader({ alg: "dir", enc: "A256GCM" })
+    .setIssuedAt()
+    .setExpirationTime(now() + maxAge)
+    .setJti(uuid())
+    .encrypt(encryptionSecret)
+}
+
+/** Decodes a NextAuth.js issued JWT. */
+export async function decode({
+  token,
+  secret,
+}: JWTDecodeParams): Promise<JWT | null> {
+  if (!token) return null
+  const encryptionSecret = await getDerivedEncryptionKey(secret)
+  const { payload } = await jwtDecrypt(token, encryptionSecret, {
+    clockTolerance: 15,
+  })
+  return payload
+}
+
+export interface GetTokenParams<R extends boolean = false> {
+  /** The request containing the JWT either in the cookies or in the `Authorization` header. */
+  req: NextApiRequest
+  /**
+   * Use secure prefix for cookie name, unless URL in `NEXTAUTH_URL` is http://
+   * or not set (e.g. development or test instance) case use unprefixed name
+   */
+  secureCookie?: boolean
+  /** If the JWT is in the cookie, what name `getToken()` should look for. */
+  cookieName?: string
+  /**
+   * `getToken()` will return the raw JWT if this is set to `true`
+   * @default false
+   */
+  raw?: R
+  secret: string
+  decode?: JWTOptions["decode"]
+  logger?: LoggerInstance | Console
+}
+
+/**
+ * Takes a NextAuth.js request (`req`) and returns either the NextAuth.js issued JWT's payload,
+ * or the raw JWT string. We look for the JWT in the either the cookies, or the `Authorization` header.
+ * [Documentation](https://next-auth.js.org/tutorials/securing-pages-and-api-routes#using-gettoken)
+ */
+export async function getToken<R extends boolean = false>(
+  params?: GetTokenParams<R>
+): Promise<R extends true ? string : JWT | null> {
+  const {
+    req,
+    secureCookie = process.env.NEXTAUTH_URL?.startsWith("https://") ??
+      !!process.env.VERCEL_URL,
+    cookieName = secureCookie
+      ? "__Secure-next-auth.session-token"
+      : "next-auth.session-token",
+    raw,
+    decode: _decode = decode,
+    logger = console,
+  } = params ?? {}
+
+  if (!req) throw new Error("Must pass `req` to JWT getToken()")
+
+  const sessionStore = new SessionStore(
+    { name: cookieName, options: { secure: secureCookie } },
+    { cookies: req.cookies, headers: req.headers },
+    logger
+  )
+
+  const token = sessionStore.value
+  // @ts-expect-error
+  if (!token) return null
+
+  // @ts-expect-error
+  if (raw) return token
+
+  try {
+    // @ts-expect-error
+    return await _decode({ token, ...params })
+  } catch {
+    // @ts-expect-error
+    return null
+  }
+}
+
+async function getDerivedEncryptionKey(secret: string | Buffer) {
+  return await hkdf(
+    "sha256",
+    secret,
+    "",
+    "NextAuth.js Generated Encryption Key",
+    32
+  )
+}

src/jwt/types.ts

@@ -0,0 +1,50 @@
+import type { Awaitable } from ".."
+
+export interface DefaultJWT extends Record<string, unknown> {
+  name?: string | null
+  email?: string | null
+  picture?: string | null
+  sub?: string
+}
+
+/**
+ * Returned by the `jwt` callback and `getToken`, when using JWT sessions
+ *
+ * [`jwt` callback](https://next-auth.js.org/configuration/callbacks#jwt-callback) | [`getToken`](https://next-auth.js.org/tutorials/securing-pages-and-api-routes#using-gettoken)
+ */
+export interface JWT extends Record<string, unknown>, DefaultJWT {}
+
+export interface JWTEncodeParams {
+  /** The JWT payload. */
+  token?: JWT
+  /** The secret used to encode the NextAuth.js issued JWT. */
+  secret: string | Buffer
+  /**
+   * The maximum age of the NextAuth.js issued JWT in seconds.
+   * @default 30 * 24 * 30 * 60 // 30 days
+   */
+  maxAge?: number
+}
+
+export interface JWTDecodeParams {
+  /** The NextAuth.js issued JWT to be decoded */
+  token?: string
+  /** The secret used to decode the NextAuth.js issued JWT. */
+  secret: string | Buffer
+}
+
+export interface JWTOptions {
+  /** The secret used to encode/decode the NextAuth.js issued JWT. */
+  secret: string
+  /**
+   * The maximum age of the NextAuth.js issued JWT in seconds.
+   * @default 30 * 24 * 30 * 60 // 30 days
+   */
+  maxAge: number
+  /** Override this method to control the NextAuth.js issued JWT encoding. */
+  encode: (params: JWTEncodeParams) => Awaitable<string>
+  /** Override this method to control the NextAuth.js issued JWT decoding. */
+  decode: (params: JWTDecodeParams) => Awaitable<JWT | null>
+}
+
+export type Secret = string | Buffer

src/lib/errors.js

@@ -1,98 +0,0 @@
-/**
- * Same as the default `Error`, but it is JSON serializable.
- * @source https://iaincollins.medium.com/error-handling-in-javascript-a6172ccdf9af
- */
-export class UnknownError extends Error {
-  constructor(error) {
-    // Support passing error or string
-    super(error?.message ?? error)
-    this.name = "UnknownError"
-    if (error instanceof Error) {
-      this.stack = error.stack
-    }
-  }
-
-  toJSON() {
-    return {
-      name: this.name,
-      message: this.message,
-      stack: this.stack,
-    }
-  }
-}
-
-export class OAuthCallbackError extends UnknownError {
-  name = "OAuthCallbackError"
-}
-
-/**
- * Thrown when an Email address is already associated with an account
- * but the user is trying an OAuth account that is not linked to it.
- */
-export class AccountNotLinkedError extends UnknownError {
-  name = "AccountNotLinkedError"
-}
-
-export class CreateUserError extends UnknownError {
-  name = "CreateUserError"
-}
-
-export class GetUserError extends UnknownError {
-  name = "GetUserError"
-}
-
-export class GetUserByEmailError extends UnknownError {
-  name = "GetUserByEmailError"
-}
-
-export class GetUserByIdError extends UnknownError {
-  name = "GetUserByIdError"
-}
-
-export class GetUserByProviderAccountIdError extends UnknownError {
-  name = "GetUserByProviderAccountIdError"
-}
-
-export class UpdateUserError extends UnknownError {
-  name = "UpdateUserError"
-}
-
-export class DeleteUserError extends UnknownError {
-  name = "DeleteUserError"
-}
-
-export class LinkAccountError extends UnknownError {
-  name = "LinkAccountError"
-}
-
-export class UnlinkAccountError extends UnknownError {
-  name = "UnlinkAccountError"
-}
-
-export class CreateSessionError extends UnknownError {
-  name = "CreateSessionError"
-}
-
-export class GetSessionError extends UnknownError {
-  name = "GetSessionError"
-}
-
-export class UpdateSessionError extends UnknownError {
-  name = "UpdateSessionError"
-}
-
-export class DeleteSessionError extends UnknownError {
-  name = "DeleteSessionError"
-}
-
-export class CreateVerificationRequestError extends UnknownError {
-  name = "CreateVerificationRequestError"
-}
-
-export class GetVerificationRequestError extends UnknownError {
-  name = "GetVerificationRequestError"
-}
-
-export class DeleteVerificationRequestError extends UnknownError {
-  name = "DeleteVerificationRequestError"
-}

src/lib/jwt.js

@@ -1,208 +0,0 @@
-import crypto from "crypto"
-import jose from "jose"
-import logger from "./logger"
-
-// Set default algorithm to use for auto-generated signing key
-const DEFAULT_SIGNATURE_ALGORITHM = "HS512"
-
-// Set default algorithm for auto-generated symmetric encryption key
-const DEFAULT_ENCRYPTION_ALGORITHM = "A256GCM"
-
-// Use encryption or not by default
-const DEFAULT_ENCRYPTION_ENABLED = false
-
-const DEFAULT_MAX_AGE = 30 * 24 * 60 * 60 // 30 days
-
-export async function encode({
-  token = {},
-  maxAge = DEFAULT_MAX_AGE,
-  secret,
-  signingKey,
-  signingOptions = {
-    expiresIn: `${maxAge}s`,
-  },
-  encryptionKey,
-  encryptionOptions = {
-    alg: "dir",
-    enc: DEFAULT_ENCRYPTION_ALGORITHM,
-    zip: "DEF",
-  },
-  encryption = DEFAULT_ENCRYPTION_ENABLED,
-} = {}) {
-  // Signing Key
-  const _signingKey = signingKey
-    ? jose.JWK.asKey(JSON.parse(signingKey))
-    : getDerivedSigningKey(secret)
-
-  // Sign token
-  const signedToken = jose.JWT.sign(token, _signingKey, signingOptions)
-
-  if (encryption) {
-    // Encryption Key
-    const _encryptionKey = encryptionKey
-      ? jose.JWK.asKey(JSON.parse(encryptionKey))
-      : getDerivedEncryptionKey(secret)
-
-    // Encrypt token
-    return jose.JWE.encrypt(signedToken, _encryptionKey, encryptionOptions)
-  }
-  return signedToken
-}
-
-export async function decode({
-  secret,
-  token,
-  maxAge = DEFAULT_MAX_AGE,
-  signingKey,
-  verificationKey = signingKey, // Optional (defaults to encryptionKey)
-  verificationOptions = {
-    maxTokenAge: `${maxAge}s`,
-    algorithms: [DEFAULT_SIGNATURE_ALGORITHM],
-  },
-  encryptionKey,
-  decryptionKey = encryptionKey, // Optional (defaults to encryptionKey)
-  decryptionOptions = {
-    algorithms: [DEFAULT_ENCRYPTION_ALGORITHM],
-  },
-  encryption = DEFAULT_ENCRYPTION_ENABLED,
-} = {}) {
-  if (!token) return null
-
-  let tokenToVerify = token
-
-  if (encryption) {
-    // Encryption Key
-    const _encryptionKey = decryptionKey
-      ? jose.JWK.asKey(JSON.parse(decryptionKey))
-      : getDerivedEncryptionKey(secret)
-
-    // Decrypt token
-    const decryptedToken = jose.JWE.decrypt(
-      token,
-      _encryptionKey,
-      decryptionOptions
-    )
-    tokenToVerify = decryptedToken.toString("utf8")
-  }
-
-  // Signing Key
-  const _signingKey = verificationKey
-    ? jose.JWK.asKey(JSON.parse(verificationKey))
-    : getDerivedSigningKey(secret)
-
-  // Verify token
-  return jose.JWT.verify(tokenToVerify, _signingKey, verificationOptions)
-}
-
-/**
- * Server-side method to retrieve the JWT from `req`.
- * @param {{
- * req: NextApiRequest
- * secureCookie?: boolean
- * cookieName?: string
- * raw?: boolean
- * }} params
- */
-export async function getToken(params) {
-  const {
-    req,
-    // Use secure prefix for cookie name, unless URL is NEXTAUTH_URL is http://
-    // or not set (e.g. development or test instance) case use unprefixed name
-    secureCookie = !(
-      !process.env.NEXTAUTH_URL ||
-      process.env.NEXTAUTH_URL.startsWith("http://")
-    ),
-    cookieName = secureCookie
-      ? "__Secure-next-auth.session-token"
-      : "next-auth.session-token",
-    raw = false,
-    decode: _decode = decode,
-  } = params
-  if (!req) throw new Error("Must pass `req` to JWT getToken()")
-
-  // Try to get token from cookie
-  let token = req.cookies[cookieName]
-
-  // If cookie not found in cookie look for bearer token in authorization header.
-  // This allows clients that pass through tokens in headers rather than as
-  // cookies to use this helper function.
-  if (!token && req.headers.authorization?.split(" ")[0] === "Bearer") {
-    const urlEncodedToken = req.headers.authorization.split(" ")[1]
-    token = decodeURIComponent(urlEncodedToken)
-  }
-
-  if (raw) {
-    return token
-  }
-
-  try {
-    return _decode({ token, ...params })
-  } catch {
-    return null
-  }
-}
-
-// Generate warning (but only once at startup) when auto-generated keys are used
-let DERIVED_SIGNING_KEY_WARNING = false
-let DERIVED_ENCRYPTION_KEY_WARNING = false
-
-// Do the better hkdf of Node.js one added in `v15.0.0` and Third Party one
-function hkdf(secret, { byteLength, encryptionInfo, digest = "sha256" }) {
-  if (crypto.hkdfSync) {
-    return Buffer.from(
-      crypto.hkdfSync(
-        digest,
-        secret,
-        Buffer.alloc(0),
-        encryptionInfo,
-        byteLength
-      )
-    )
-  }
-  return require("futoin-hkdf")(secret, byteLength, {
-    info: encryptionInfo,
-    hash: digest,
-  })
-}
-
-function getDerivedSigningKey(secret) {
-  if (!DERIVED_SIGNING_KEY_WARNING) {
-    logger.warn("JWT_AUTO_GENERATED_SIGNING_KEY")
-    DERIVED_SIGNING_KEY_WARNING = true
-  }
-
-  const buffer = hkdf(secret, {
-    byteLength: 64,
-    encryptionInfo: "NextAuth.js Generated Signing Key",
-  })
-  const key = jose.JWK.asKey(buffer, {
-    alg: DEFAULT_SIGNATURE_ALGORITHM,
-    use: "sig",
-    kid: "nextauth-auto-generated-signing-key",
-  })
-  return key
-}
-
-function getDerivedEncryptionKey(secret) {
-  if (!DERIVED_ENCRYPTION_KEY_WARNING) {
-    logger.warn("JWT_AUTO_GENERATED_ENCRYPTION_KEY")
-    DERIVED_ENCRYPTION_KEY_WARNING = true
-  }
-
-  const buffer = hkdf(secret, {
-    byteLength: 32,
-    encryptionInfo: "NextAuth.js Generated Encryption Key",
-  })
-  const key = jose.JWK.asKey(buffer, {
-    alg: DEFAULT_ENCRYPTION_ALGORITHM,
-    use: "enc",
-    kid: "nextauth-auto-generated-encryption-key",
-  })
-  return key
-}
-
-export default {
-  encode,
-  decode,
-  getToken,
-}

src/lib/logger.js

@@ -1,81 +0,0 @@
-/** @type {import("types").LoggerInstance} */
-const _logger = {
-  error(code, ...message) {
-    console.error(
-      `[next-auth][error][${code.toLowerCase()}]`,
-      `\nhttps://next-auth.js.org/errors#${code.toLowerCase()}`,
-      ...message
-    )
-  },
-  warn(code, ...message) {
-    console.warn(
-      `[next-auth][warn][${code.toLowerCase()}]`,
-      `\nhttps://next-auth.js.org/warnings#${code.toLowerCase()}`,
-      ...message
-    )
-  },
-  debug(code, ...message) {
-    if (!process?.env?._NEXTAUTH_DEBUG) return
-    console.log(`[next-auth][debug][${code.toLowerCase()}]`, ...message)
-  },
-}
-
-/**
- * Override the built-in logger.
- * Any `undefined` level will use the default logger.
- * @param {Partial<import("types").LoggerInstance>} newLogger
- */
-export function setLogger(newLogger = {}) {
-  if (newLogger.error) _logger.error = newLogger.error
-  if (newLogger.warn) _logger.warn = newLogger.warn
-  if (newLogger.debug) _logger.debug = newLogger.debug
-}
-
-export default _logger
-
-/**
- * Serializes client-side log messages and sends them to the server
- * @param {import("types").LoggerInstance} logger
- * @param {string} basePath
- * @return {import("types").LoggerInstance}
- */
-export function proxyLogger(logger = _logger, basePath) {
-  try {
-    if (typeof window === "undefined") {
-      return logger
-    }
-
-    const clientLogger = {}
-    for (const level in logger) {
-      clientLogger[level] = (code, ...message) => {
-        _logger[level](code, ...message) // Log on client as usual
-
-        const url = `${basePath}/_log`
-        const body = new URLSearchParams({
-          level,
-          code,
-          message: JSON.stringify(
-            message.map((m) => {
-              if (m instanceof Error) {
-                // Serializing errors: https://iaincollins.medium.com/error-handling-in-javascript-a6172ccdf9af
-                return { name: m.name, message: m.message, stack: m.stack }
-              }
-              return m
-            })
-          ),
-        })
-        if (navigator.sendBeacon) {
-          return navigator.sendBeacon(url, body)
-        }
-        return fetch(url, {
-          method: "POST",
-          headers: { "Content-Type": "application/json" },
-          body,
-        })
-      }
-    }
-    return clientLogger
-  } catch {
-    return _logger
-  }
-}

src/lib/logger.ts

@@ -0,0 +1,113 @@
+import { UnknownError } from "../core/errors"
+
+// TODO: better typing
+/** Makes sure that error is always serializable */
+function formatError(o: unknown): unknown {
+  if (o instanceof Error && !(o instanceof UnknownError)) {
+    return { message: o.message, stack: o.stack, name: o.name }
+  }
+  if (hasErrorProperty(o)) {
+    o.error = formatError(o.error) as Error
+    o.message = o.message ?? o.error.message
+  }
+  return o
+}
+
+function hasErrorProperty(
+  x: unknown
+): x is { error: Error; [key: string]: unknown } {
+  return !!(x as any)?.error
+}
+
+export type WarningCode = "NEXTAUTH_URL" | "NO_SECRET"
+
+/**
+ * Override any of the methods, and the rest will use the default logger.
+ *
+ * [Documentation](https://next-auth.js.org/configuration/options#logger)
+ */
+export interface LoggerInstance extends Record<string, Function> {
+  warn: (code: WarningCode) => void
+  error: (
+    code: string,
+    /**
+     * Either an instance of (JSON serializable) Error
+     * or an object that contains some debug information.
+     * (Error is still available through `metadata.error`)
+     */
+    metadata: Error | { error: Error; [key: string]: unknown }
+  ) => void
+  debug: (code: string, metadata: unknown) => void
+}
+
+const _logger: LoggerInstance = {
+  error(code, metadata) {
+    metadata = formatError(metadata) as Error
+    console.error(
+      `[next-auth][error][${code}]`,
+      `\nhttps://next-auth.js.org/errors#${code.toLowerCase()}`,
+      metadata.message,
+      metadata
+    )
+  },
+  warn(code) {
+    console.warn(
+      `[next-auth][warn][${code}]`,
+      `\nhttps://next-auth.js.org/warnings#${code.toLowerCase()}`
+    )
+  },
+  debug(code, metadata) {
+    console.log(`[next-auth][debug][${code}]`, metadata)
+  },
+}
+
+/**
+ * Override the built-in logger with user's implementation.
+ * Any `undefined` level will use the default logger.
+ */
+export function setLogger(
+  newLogger: Partial<LoggerInstance> = {},
+  debug?: boolean
+) {
+  // Turn off debug logging if `debug` isn't set to `true`
+  if (!debug) _logger.debug = () => {}
+
+  if (newLogger.error) _logger.error = newLogger.error
+  if (newLogger.warn) _logger.warn = newLogger.warn
+  if (newLogger.debug) _logger.debug = newLogger.debug
+}
+
+export default _logger
+
+/** Serializes client-side log messages and sends them to the server */
+export function proxyLogger(
+  logger: LoggerInstance = _logger,
+  basePath?: string
+): LoggerInstance {
+  try {
+    if (typeof window === "undefined") {
+      return logger
+    }
+
+    const clientLogger: Record<string, unknown> = {}
+    for (const level in logger) {
+      clientLogger[level] = (code: string, metadata: Error) => {
+        _logger[level](code, metadata) // Logs to console
+
+        if (level === "error") {
+          metadata = formatError(metadata) as Error
+        }
+        ;(metadata as any).client = true
+        const url = `${basePath}/_log`
+        const body = new URLSearchParams({ level, code, ...metadata })
+        if (navigator.sendBeacon) {
+          return navigator.sendBeacon(url, body)
+        }
+        return fetch(url, { method: "POST", body, keepalive: true })
+      }
+    }
+    return clientLogger as unknown as LoggerInstance
+  } catch {
+    return _logger
+  }
+}

src/lib/merge.ts

@@ -0,0 +1,25 @@
+// Source: https://stackoverflow.com/a/34749873/5364135
+
+/** Simple object check */
+function isObject(item: any): boolean {
+  return item && typeof item === "object" && !Array.isArray(item)
+}
+
+/** Deep merge two objects */
+export function merge(target: any, ...sources: any[]): any {
+  if (!sources.length) return target
+  const source = sources.shift()
+
+  if (isObject(target) && isObject(source)) {
+    for (const key in source) {
+      if (isObject(source[key])) {
+        if (!target[key]) Object.assign(target, { [key]: {} })
+        merge(target[key], source[key])
+      } else {
+        Object.assign(target, { [key]: source[key] })
+      }
+    }
+  }
+
+  return merge(target, ...sources)
+}

src/lib/parse-url.js

@@ -1,27 +0,0 @@
-/**
- * Simple universal (client/server) function to split host and path
- * We use this rather than a library because we need to use the same logic both
- * client and server side and we only need to parse out the host and path, while
- * supporting a default value, so a simple split is sufficent.
- * @param {string} url
- */
-export default function parseUrl (url) {
-  // Default values
-  const defaultHost = 'http://localhost:3000'
-  const defaultPath = '/api/auth'
-
-  if (!url) { url = `${defaultHost}${defaultPath}` }
-
-  // Default to HTTPS if no protocol explictly specified
-  const protocol = url.startsWith('http:') ? 'http' : 'https'
-
-  // Normalize URLs by stripping protocol and no trailing slash
-  url = url.replace(/^https?:\/\//, '').replace(/\/$/, '')
-
-  // Simple split based on first /
-  const [_host, ..._path] = url.split('/')
-  const baseUrl = _host ? `${protocol}://${_host}` : defaultHost
-  const basePath = _path.length > 0 ? `/${_path.join('/')}` : defaultPath
-
-  return { baseUrl, basePath }
-}

src/lib/parse-url.ts

@@ -0,0 +1,35 @@
+export interface InternalUrl {
+  /** @default "http://localhost:3000" */
+  origin: string
+  /** @default "localhost:3000" */
+  host: string
+  /** @default "/api/auth" */
+  path: string
+  /** @default "http://localhost:3000/api/auth" */
+  base: string
+  /** @default "http://localhost:3000/api/auth" */
+  toString: () => string
+}
+
+export default function parseUrl(url?: string): InternalUrl {
+  const defaultUrl = new URL("http://localhost:3000/api/auth")
+
+  if (url && !url.startsWith("http")) {
+    url = `https://${url}`
+  }
+
+  const _url = new URL(url ?? defaultUrl)
+  const path = (_url.pathname === "/" ? defaultUrl.pathname : _url.pathname)
+    // Remove trailing slash
+    .replace(/\/$/, "")
+
+  const base = `${_url.origin}${path}`
+
+  return {
+    origin: _url.origin,
+    host: _url.host,
+    path,
+    base,
+    toString: () => base,
+  }
+}