feat: first commit, got event listeners to work

.gitignore

@@ -0,0 +1,45 @@
+.gradle
+build/
+!gradle/wrapper/gradle-wrapper.jar
+!**/src/main/**/build/
+!**/src/test/**/build/
+
+### IntelliJ IDEA ###
+.idea/modules.xml
+.idea/jarRepositories.xml
+.idea/compiler.xml
+.idea/libraries/
+*.iws
+*.iml
+*.ipr
+out/
+!**/src/main/**/out/
+!**/src/test/**/out/
+
+### Eclipse ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+bin/
+!**/src/main/**/bin/
+!**/src/test/**/bin/
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+
+### VS Code ###
+.vscode/
+
+### Mac OS ###
+.DS_Store
+
+/src/main/resources/
+/.env

.idea/.gitignore

@@ -0,0 +1,8 @@
+# Default ignored files
+/shelf/
+/workspace.xml
+# Editor-based HTTP Client requests
+/httpRequests/
+# Datasource local storage ignored files
+/dataSources/
+/dataSources.local.xml

.idea/discord.xml

@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="DiscordProjectSettings">
+    <option name="show" value="PROJECT" />
+    <option name="description" value="" />
+  </component>
+</project>

.idea/gradle.xml

@@ -0,0 +1,18 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="GradleMigrationSettings" migrationVersion="1" />
+  <component name="GradleSettings">
+    <option name="linkedExternalProjectsSettings">
+      <GradleProjectSettings>
+        <option name="distributionType" value="WRAPPED" />
+        <option name="externalProjectPath" value="$PROJECT_DIR$" />
+        <option name="gradleJvm" value="#JAVA_HOME" />
+        <option name="modules">
+          <set>
+            <option value="$PROJECT_DIR$" />
+          </set>
+        </option>
+      </GradleProjectSettings>
+    </option>
+  </component>
+</project>

.idea/misc.xml

@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ExternalStorageConfigurationManager" enabled="true" />
+  <component name="FrameworkDetectionExcludesConfiguration">
+    <file type="web" url="file://$PROJECT_DIR$" />
+  </component>
+  <component name="MarkdownSettingsMigration">
+    <option name="stateVersion" value="1" />
+  </component>
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_15" project-jdk-name="openjdk-17" project-jdk-type="JavaSDK">
+    <output url="file://$PROJECT_DIR$/out" />
+  </component>
+</project>

.idea/vcs.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="VcsDirectoryMappings">
+    <mapping directory="$PROJECT_DIR$" vcs="Git" />
+  </component>
+</project>

build.gradle.kts

@@ -0,0 +1,45 @@
+import org.jetbrains.kotlin.gradle.tasks.KotlinCompile
+val jwt_version : String by project
+val coroutine_version : String by project
+val gh_version : String by project
+val arrow_fx_version : String by project
+val fuel_version : String by project
+plugins {
+    kotlin("jvm") version "1.7.10"
+    application
+    kotlin("plugin.serialization") version "1.7.10"
+}
+
+group = "org.example"
+version = "1.0-SNAPSHOT"
+
+repositories {
+    mavenCentral()
+}
+
+dependencies {
+    implementation(platform("io.arrow-kt:arrow-stack:$arrow_fx_version"))
+    testImplementation(kotlin("test"))
+    implementation("io.ktor:ktor-client-core:2.1.0")
+    implementation("io.ktor:ktor-client-cio:2.1.0")
+    implementation("io.ktor:ktor-server-core-jvm:2.0.3")
+    implementation("io.ktor:ktor-server-netty-jvm:2.0.3")
+    implementation("com.auth0:java-jwt:$jwt_version")
+    implementation("org.jetbrains.kotlinx:kotlinx-coroutines-core:$coroutine_version")
+    implementation("io.github.cdimascio:dotenv-kotlin:6.3.1")
+    implementation("org.kohsuke:github-api:$gh_version")
+    implementation("io.arrow-kt:arrow-fx-coroutines")
+    implementation("io.arrow-kt:arrow-core")
+}
+
+tasks.test {
+    useJUnitPlatform()
+}
+
+tasks.withType<KotlinCompile> {
+    kotlinOptions.jvmTarget = "1.8"
+}
+
+application {
+    mainClass.set("MainKt")
+}

gradle.properties

@@ -0,0 +1,6 @@
+kotlin.code.style=official
+jwt_version=4.0.0
+coroutine_version= 1.6.4
+gh_version=1.307
+arrow_fx_version=1.0.1
+fuel_version=4.6.4

gradle/wrapper/gradle-wrapper.properties

@@ -0,0 +1,5 @@
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-7.4.2-bin.zip
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists

gradlew

@@ -0,0 +1,234 @@
+#!/bin/sh
+
+#
+# Copyright © 2015-2021 the original authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+##############################################################################
+#
+#   Gradle start up script for POSIX generated by Gradle.
+#
+#   Important for running:
+#
+#   (1) You need a POSIX-compliant shell to run this script. If your /bin/sh is
+#       noncompliant, but you have some other compliant shell such as ksh or
+#       bash, then to run this script, type that shell name before the whole
+#       command line, like:
+#
+#           ksh Gradle
+#
+#       Busybox and similar reduced shells will NOT work, because this script
+#       requires all of these POSIX shell features:
+#         * functions;
+#         * expansions «$var», «${var}», «${var:-default}», «${var+SET}»,
+#           «${var#prefix}», «${var%suffix}», and «$( cmd )»;
+#         * compound commands having a testable exit status, especially «case»;
+#         * various built-in commands including «command», «set», and «ulimit».
+#
+#   Important for patching:
+#
+#   (2) This script targets any POSIX shell, so it avoids extensions provided
+#       by Bash, Ksh, etc; in particular arrays are avoided.
+#
+#       The "traditional" practice of packing multiple parameters into a
+#       space-separated string is a well documented source of bugs and security
+#       problems, so this is (mostly) avoided, by progressively accumulating
+#       options in "$@", and eventually passing that to Java.
+#
+#       Where the inherited environment variables (DEFAULT_JVM_OPTS, JAVA_OPTS,
+#       and GRADLE_OPTS) rely on word-splitting, this is performed explicitly;
+#       see the in-line comments for details.
+#
+#       There are tweaks for specific operating systems such as AIX, CygWin,
+#       Darwin, MinGW, and NonStop.
+#
+#   (3) This script is generated from the Groovy template
+#       https://github.com/gradle/gradle/blob/master/subprojects/plugins/src/main/resources/org/gradle/api/internal/plugins/unixStartScript.txt
+#       within the Gradle project.
+#
+#       You can find Gradle at https://github.com/gradle/gradle/.
+#
+##############################################################################
+
+# Attempt to set APP_HOME
+
+# Resolve links: $0 may be a link
+app_path=$0
+
+# Need this for daisy-chained symlinks.
+while
+    APP_HOME=${app_path%"${app_path##*/}"}  # leaves a trailing /; empty if no leading path
+    [ -h "$app_path" ]
+do
+    ls=$( ls -ld "$app_path" )
+    link=${ls#*' -> '}
+    case $link in             #(
+      /*)   app_path=$link ;; #(
+      *)    app_path=$APP_HOME$link ;;
+    esac
+done
+
+APP_HOME=$( cd "${APP_HOME:-./}" && pwd -P ) || exit
+
+APP_NAME="Gradle"
+APP_BASE_NAME=${0##*/}
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD=maximum
+
+warn () {
+    echo "$*"
+} >&2
+
+die () {
+    echo
+    echo "$*"
+    echo
+    exit 1
+} >&2
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "$( uname )" in                #(
+  CYGWIN* )         cygwin=true  ;; #(
+  Darwin* )         darwin=true  ;; #(
+  MSYS* | MINGW* )  msys=true    ;; #(
+  NONSTOP* )        nonstop=true ;;
+esac
+
+CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
+
+
+# Determine the Java command to use to start the JVM.
+if [ -n "$JAVA_HOME" ] ; then
+    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+        # IBM's JDK on AIX uses strange locations for the executables
+        JAVACMD=$JAVA_HOME/jre/sh/java
+    else
+        JAVACMD=$JAVA_HOME/bin/java
+    fi
+    if [ ! -x "$JAVACMD" ] ; then
+        die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+else
+    JAVACMD=java
+    which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+fi
+
+# Increase the maximum file descriptors if we can.
+if ! "$cygwin" && ! "$darwin" && ! "$nonstop" ; then
+    case $MAX_FD in #(
+      max*)
+        MAX_FD=$( ulimit -H -n ) ||
+            warn "Could not query maximum file descriptor limit"
+    esac
+    case $MAX_FD in  #(
+      '' | soft) :;; #(
+      *)
+        ulimit -n "$MAX_FD" ||
+            warn "Could not set maximum file descriptor limit to $MAX_FD"
+    esac
+fi
+
+# Collect all arguments for the java command, stacking in reverse order:
+#   * args from the command line
+#   * the main class name
+#   * -classpath
+#   * -D...appname settings
+#   * --module-path (only if needed)
+#   * DEFAULT_JVM_OPTS, JAVA_OPTS, and GRADLE_OPTS environment variables.
+
+# For Cygwin or MSYS, switch paths to Windows format before running java
+if "$cygwin" || "$msys" ; then
+    APP_HOME=$( cygpath --path --mixed "$APP_HOME" )
+    CLASSPATH=$( cygpath --path --mixed "$CLASSPATH" )
+
+    JAVACMD=$( cygpath --unix "$JAVACMD" )
+
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    for arg do
+        if
+            case $arg in                                #(
+              -*)   false ;;                            # don't mess with options #(
+              /?*)  t=${arg#/} t=/${t%%/*}              # looks like a POSIX filepath
+                    [ -e "$t" ] ;;                      #(
+              *)    false ;;
+            esac
+        then
+            arg=$( cygpath --path --ignore --mixed "$arg" )
+        fi
+        # Roll the args list around exactly as many times as the number of
+        # args, so each arg winds up back in the position where it started, but
+        # possibly modified.
+        #
+        # NB: a `for` loop captures its iteration list before it begins, so
+        # changing the positional parameters here affects neither the number of
+        # iterations, nor the values presented in `arg`.
+        shift                   # remove old arg
+        set -- "$@" "$arg"      # push replacement arg
+    done
+fi
+
+# Collect all arguments for the java command;
+#   * $DEFAULT_JVM_OPTS, $JAVA_OPTS, and $GRADLE_OPTS can contain fragments of
+#     shell script including quotes and variable substitutions, so put them in
+#     double quotes to make sure that they get re-expanded; and
+#   * put everything else in single quotes, so that it's not re-expanded.
+
+set -- \
+        "-Dorg.gradle.appname=$APP_BASE_NAME" \
+        -classpath "$CLASSPATH" \
+        org.gradle.wrapper.GradleWrapperMain \
+        "$@"
+
+# Use "xargs" to parse quoted args.
+#
+# With -n1 it outputs one arg per line, with the quotes and backslashes removed.
+#
+# In Bash we could simply go:
+#
+#   readarray ARGS < <( xargs -n1 <<<"$var" ) &&
+#   set -- "${ARGS[@]}" "$@"
+#
+# but POSIX shell has neither arrays nor command substitution, so instead we
+# post-process each arg (as a line of input to sed) to backslash-escape any
+# character that might be a shell metacharacter, then use eval to reverse
+# that process (while maintaining the separation between arguments), and wrap
+# the whole thing up as a single "set" statement.
+#
+# This will of course break if any of these variables contains a newline or
+# an unmatched quote.
+#
+
+eval "set -- $(
+        printf '%s\n' "$DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS" |
+        xargs -n1 |
+        sed ' s~[^-[:alnum:]+,./:=@_]~\\&~g; ' |
+        tr '\n' ' '
+    )" '"$@"'
+
+exec "$JAVACMD" "$@"

gradlew.bat

@@ -0,0 +1,89 @@
+@rem
+@rem Copyright 2015 the original author or authors.
+@rem
+@rem Licensed under the Apache License, Version 2.0 (the "License");
+@rem you may not use this file except in compliance with the License.
+@rem You may obtain a copy of the License at
+@rem
+@rem      https://www.apache.org/licenses/LICENSE-2.0
+@rem
+@rem Unless required by applicable law or agreed to in writing, software
+@rem distributed under the License is distributed on an "AS IS" BASIS,
+@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+@rem See the License for the specific language governing permissions and
+@rem limitations under the License.
+@rem
+
+@if "%DEBUG%" == "" @echo off
+@rem ##########################################################################
+@rem
+@rem  Gradle startup script for Windows
+@rem
+@rem ##########################################################################
+
+@rem Set local scope for the variables with windows NT shell
+if "%OS%"=="Windows_NT" setlocal
+
+set DIRNAME=%~dp0
+if "%DIRNAME%" == "" set DIRNAME=.
+set APP_BASE_NAME=%~n0
+set APP_HOME=%DIRNAME%
+
+@rem Resolve any "." and ".." in APP_HOME to make it shorter.
+for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi
+
+@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"
+
+@rem Find java.exe
+if defined JAVA_HOME goto findJavaFromJavaHome
+
+set JAVA_EXE=java.exe
+%JAVA_EXE% -version >NUL 2>&1
+if "%ERRORLEVEL%" == "0" goto execute
+
+echo.
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto execute
+
+echo.
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:execute
+@rem Setup the command line
+
+set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
+
+
+@rem Execute Gradle
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %*
+
+:end
+@rem End local scope for the variables with windows NT shell
+if "%ERRORLEVEL%"=="0" goto mainEnd
+
+:fail
+rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
+rem the _cmd.exe /c_ return code!
+if  not "" == "%GRADLE_EXIT_CONSOLE%" exit 1
+exit /b 1
+
+:mainEnd
+if "%OS%"=="Windows_NT" endlocal
+
+:omega

settings.gradle.kts

@@ -0,0 +1,3 @@
+
+rootProject.name = "sern-automata"
+

src/main/kotlin/Client.kt

@@ -0,0 +1,125 @@
+import arrow.core.Either
+import arrow.fx.coroutines.release
+import arrow.fx.coroutines.resource
+import com.auth0.jwt.JWT
+import com.auth0.jwt.algorithms.Algorithm
+import com.auth0.jwt.exceptions.JWTCreationException
+import io.github.cdimascio.dotenv.dotenv
+import io.ktor.server.engine.*
+import io.ktor.server.netty.*
+import kotlinx.coroutines.*
+import kotlinx.coroutines.channels.Channel
+import kotlinx.coroutines.channels.Channel.Factory.UNLIMITED
+import kotlinx.coroutines.flow.collect
+import org.kohsuke.github.*
+import org.kohsuke.github.connector.GitHubConnector
+import java.security.KeyFactory
+import java.security.interfaces.RSAPrivateKey
+import java.security.spec.PKCS8EncodedKeySpec
+import java.time.Instant
+import java.util.*
+import kotlin.coroutines.CoroutineContext
+
+object Client : CoroutineScope {
+    private const val orgName = "sern-handler"
+    private const val baseLink = "https://api.github.com"
+    private var jwtToken: String
+    private var gitHubApp: GHApp
+    private var gitHub: GitHub
+    private var parentJob = Job()
+    val eventEmitter = EventEmitter()
+
+    override val coroutineContext: CoroutineContext
+        get() = Dispatchers.Default + parentJob
+    private val server = embeddedServer(
+        Netty,
+        port = 8000,
+        host = "localhost",
+        parentCoroutineContext = coroutineContext
+    ) {
+        configureRouting()
+    }
+    init {
+        runBlocking {
+            dotenv {
+                systemProperties = true
+            }
+            val privateKey = processKey().use { it }
+            val algorithm = Algorithm.RSA256(privateKey)
+            jwtToken = JWT.create()
+                .withIssuer("215907")
+                .withIssuedAt(Instant.now().minusMillis(6_000))
+                .withExpiresAt(Instant.now().plusMillis(600000))
+                .sign(algorithm) ?: throw JWTCreationException("Could not create JWT", Throwable())
+            val github = GitHubBuilder()
+                .withJwtToken(jwtToken)
+                .withConnector(GitHubConnector.DEFAULT)
+                .withEndpoint(baseLink)
+                .build()
+            gitHubApp = github.app
+            val appInstallation = gitHubApp.getInstallationByOrganization("sern-handler")
+            val installationToken = appInstallation.createToken().create()
+            gitHub = GitHubBuilder()
+                .withAppInstallationToken(installationToken.token)
+                .withEndpoint(baseLink)
+                .build()
+
+        }
+    }
+
+    fun fetchRepoAsync(name: String) : Deferred<Either<String,GHRepository>> {
+        return async {
+            try {
+                Either.Right(gitHub.getRepository("$orgName/$name"))
+            } catch (e: Throwable) {
+                Either.Left(e.message ?: "Something went wrong while trying to fetch repository")
+            }
+
+        }
+    }
+     fun fetchPullRequestAsync(repo : GHRepository, id: Int) : Deferred<Either<String, GHPullRequest>> {
+        return async {
+                try {
+                    Either.Right(repo.getPullRequest(id))
+                } catch(e : Throwable) {
+                    Either.Left("Could not find a pull request #$id")
+             }
+        }
+    }
+    suspend fun <T> on(
+        eventName: String,
+        fn: suspend (String) -> Unit
+    ) {
+        Client.launch {
+            eventEmitter.events.collect {
+                when (it) {
+                    "Hello" -> fn(it)
+                }
+            }
+        }
+    }
+
+    private fun processKey() = resource {
+        object{}.javaClass.getResourceAsStream("/private_key.pem")
+            ?.bufferedReader()
+            ?.useLines { br ->
+                val privateKey = br.filter { str ->
+                    str != "-----BEGIN PRIVATE KEY-----" && str != "-----END PRIVATE KEY-----"
+                }
+                val seq = privateKey.joinToString("")
+                val encoded = Base64.getDecoder().decode(seq)
+                val kf = KeyFactory.getInstance("RSA")
+                val keySpec = PKCS8EncodedKeySpec(encoded)
+                (kf.generatePrivate(keySpec) as RSAPrivateKey)
+            }
+    } release {
+        println("Released resources from reading pem")
+    }
+
+    /**
+     * This should start last in order to prevent blocking of thread and listeners
+     */
+    fun startWebhookListener() {
+        server.start(wait = true)
+    }
+}

src/main/kotlin/EventEmitter.kt

@@ -0,0 +1,12 @@
+import kotlinx.coroutines.flow.MutableSharedFlow
+import kotlinx.coroutines.flow.asSharedFlow
+
+typealias Event = String
+class EventEmitter {
+    private val _events = MutableSharedFlow<Event>() // private mutable shared flow
+    val events = _events.asSharedFlow() // publicly exposed as read-only shared flow
+
+    suspend fun produceEvent(event: Event) {
+        _events.emit(event) // suspends until all subscribers receive it
+    }
+}

src/main/kotlin/HttpClientExtensions.kt

@@ -0,0 +1,64 @@
+import io.ktor.http.*
+import io.ktor.server.application.*
+import io.ktor.server.request.*
+import io.ktor.server.response.*
+import io.ktor.server.routing.*
+import io.ktor.util.pipeline.*
+import kotlinx.coroutines.*
+import javax.crypto.Mac
+import javax.crypto.spec.SecretKeySpec
+import kotlin.experimental.xor
+
+
+fun Application.configureRouting() {
+    routing {
+        pullRequests()
+    }
+
+}
+
+fun Routing.pullRequests() {
+        post("/payload") {
+            val secret = call.request.headers["X-Hub-Signature-256"]!!
+            val text = call.receiveText()
+            if(!HashUtils.secureCompare(secret, HashUtils.sha256(text))) {
+                call.respond(HttpStatusCode.Unauthorized, "Nice try")
+            }
+            launch(Dispatchers.Default) {
+                Client.eventEmitter.produceEvent(text)
+            }.join()
+        }
+}
+
+object HashUtils {
+    private fun ByteArray.toHex(): String = joinToString(separator = "") { eachByte -> "%02x".format(eachByte) }
+
+    //https://security.stackexchange.com/questions/239054/timing-attacks-in-password-hash-comparisons
+    fun secureCompare(secret : String, hash: String) : Boolean {
+        val digesta = secret.toByteArray(); val digestb = hash.toByteArray()
+
+        if (digesta.size and digestb.size == 0) return false
+        var difference = 0
+        for (i in digesta.indices) difference = difference.or(digesta[i].xor(digestb[i]).toInt())
+        return difference == 0
+    }
+    /**
+     * Supported algorithms on Android:
+     *
+     * Algorithm    Supported API Levels
+     * MD5          1+
+     * SHA-1        1+
+     * SHA-224      1-8,22+
+     * SHA-256      1+
+     * SHA-384      1+
+     * SHA-512      1+
+     */
+    fun sha256(body: String): String {
+        val key = System.getProperty("WEBHOOK_TOKEN")
+        val hasher: Mac = Mac.getInstance("HmacSHA256")
+        hasher.init(SecretKeySpec(key.toByteArray(), "HmacSHA256"))
+
+        val hash: ByteArray = hasher.doFinal(body.toByteArray())
+        return "sha256=${hash.toHex()}"
+    }
+}

src/main/kotlin/Main.kt

@@ -0,0 +1,21 @@
+
+import kotlinx.coroutines.*
+
+fun main() = runBlocking {
+
+    val client = Client
+
+    client.on<String>("pullRequest") {
+        println(it + "2")
+    }
+    client.on<String>("issue") {
+        println(it + "3")
+    }
+    println("Start program")
+    println(Thread.currentThread().name)
+    client.startWebhookListener()
+}
+
+
+
+