feat(provider): add Kakao provider (#1459)

src/providers/index.js

@@ -19,6 +19,7 @@ import GitLab from './gitlab'
 import Google from './google'
 import IdentityServer4 from './identity-server4'
 import Instagram from './instagram'
+import Kakao from './kakao'
 import LINE from './line'
 import LinkedIn from './linkedin'
 import MailRu from './mailru'
@@ -58,6 +59,7 @@ export default {
   Google,
   IdentityServer4,
   Instagram,
+  Kakao,
   LINE,
   LinkedIn,
   MailRu,

src/providers/kakao.js

@@ -0,0 +1,21 @@
+export default (options) => {
+  return {
+    id: 'kakao',
+    name: 'Kakao',
+    type: 'oauth',
+    version: '2.0',
+    params: { grant_type: 'authorization_code' },
+    accessTokenUrl: 'https://kauth.kakao.com/oauth/token',
+    authorizationUrl: 'https://kauth.kakao.com/oauth/authorize?response_type=code',
+    profileUrl: 'https://kapi.kakao.com/v2/user/me',
+    profile: (profile) => {
+      return {
+        id: profile.id,
+        name: profile.kakao_account?.profile.nickname,
+        email: profile.kakao_account?.email,
+        image: profile.kakao_account?.profile.profile_image_url
+      }
+    },
+    ...options
+  }
+}

www/docs/providers/kakao.md

@@ -0,0 +1,32 @@
+---
+id: kakao
+title: Kakao
+---
+
+## Documentation
+
+https://developers.kakao.com/product/kakaoLogin
+
+## Configuration
+
+https://developers.kakao.com/docs/latest/en/kakaologin/common
+
+## Example
+
+```js
+import Providers from `next-auth/providers`
+...
+providers: [
+  Providers.Kakao({
+    clientId: process.env.KAKAO_CLIENT_ID,
+    clientSecret: process.env.KAKAO_CLIENT_SECRET
+  })
+]
+...
+```
+
+## Instructions
+
+### Configuration
+
+Create a provider and a Kakao application at `https://developers.kakao.com/console/app`. In the settings of the app under Kakao Login, activate web app, change consent items and configure callback URL.