discord oauth2

.gitattributes

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+gradlew                                   text eol=lf
+gradlew.bat                               -text
+gradle/wrapper/gradle-wrapper.properties  text eol=lf

.gitignore

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+# IDEA #
+.idea/
+out/
+*.iml
+*.ipr
+*.iws
+*.ids
+
+# GRADLE #
+.gradle/
+build/
+publish.gradle

README.MD

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+# Spring Boot + OAuth2 Discord
+
+<img width="auto" height="100" src="https://spring.io/images/spring-initializr-4291cc0115eb104348717b82161a81de.svg">
+<img width="auto" height="100" src="https://www.freepngimg.com/thumb/computer/94317-teamspeak-discord-servers-computer-facial-smile-expression.png">
+
+## Перед запуском
+### Создание Discord Application
+Для запуска понадобиться обзавестить своим **Discord Application**.
+
+1. Переходим на [Discord Developer Portal](https://discord.com/developers/applications)
+2. Создаём новое приложение  
+  ![](docs/1.png)
+3. Переходим в раздел OAuth2  
+  ![](docs/2.png)
+4. Добавляем адрес `http://127.0.0.1:8080/login/oauth2/code/discord` как адрес переадресации при успешной авторизации  
+  ![](docs/3.png)  
+  ![](docs/4.png)
+5. Создаём **Client Secret**  
+  ![](docs/5.png)  
+  ![](docs/6.png)
+6. Не забываем сохранить внесённые изменения!  
+  ![](docs/7.png)
+
+### Настройка Spring
+Открываем файл `src/main/resources/application.yml` и указываем там **Client ID** и **Client Secret**,
+которые были указаны в разделе **OAuth2**:
+```yaml
+spring:
+  security:
+    oauth2:
+      client:
+        registration:
+          discord:
+            client-id: 965013316982423632
+            client-secret: yhb13RP26WxfOru9fcQ6CxPcAUWr_2q6
+```

build.gradle

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+plugins {
+	id 'org.springframework.boot' version '2.6.6'
+	id 'io.spring.dependency-management' version '1.0.11.RELEASE'
+	id 'java'
+}
+
+group = 'example.oauth2'
+version = '1.0-SNAPSHOT'
+sourceCompatibility = '11'
+
+repositories {
+	mavenCentral()
+}
+
+dependencies {
+	annotationProcessor('org.projectlombok:lombok')
+	compileOnly('org.projectlombok:lombok')
+
+	implementation('org.springframework.boot:spring-boot-starter-web')
+	implementation('org.springframework.boot:spring-boot-starter-thymeleaf')
+
+	implementation('org.springframework.boot:spring-boot-starter-security')
+	implementation('org.springframework.security:spring-security-oauth2-client')
+}
+

gradle/wrapper/gradle-wrapper.properties

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+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-7.4.1-bin.zip
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists

gradlew

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+#!/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

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+@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

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+rootProject.name = 'spring-oauth2-discord'

src/main/java/example/oauth2/discord/Application.java

@@ -0,0 +1,13 @@
+package example.oauth2.discord;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class Application {
+
+	public static void main(String[] args) {
+		SpringApplication.run(Application.class, args);
+	}
+
+}

src/main/java/example/oauth2/discord/config/DiscordOAuth2Config.java

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+package example.oauth2.discord.config;
+
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.core.env.Environment;
+import org.springframework.security.oauth2.client.InMemoryOAuth2AuthorizedClientService;
+import org.springframework.security.oauth2.client.OAuth2AuthorizedClientService;
+import org.springframework.security.oauth2.client.registration.ClientRegistration;
+import org.springframework.security.oauth2.client.registration.ClientRegistrationRepository;
+import org.springframework.security.oauth2.client.registration.InMemoryClientRegistrationRepository;
+import org.springframework.security.oauth2.core.AuthorizationGrantType;
+import org.springframework.security.oauth2.core.ClientAuthenticationMethod;
+
+/*
+Отдельное спасибо
+- https://www.baeldung.com/spring-security-5-oauth2-login
+- https://github.com/spring-projects/spring-security/blob/main/config/src/main/java/org/springframework/security/config/oauth2/client/CommonOAuth2Provider.java
+ */
+
+@Configuration
+public class DiscordOAuth2Config {
+    private static final String DISCORD_CLIENT_PROPERTY_KEY = "spring.security.oauth2.client.registration.discord";
+    private static final String DEFAULT_REDIRECT_URL = "{baseUrl}/{action}/oauth2/code/{registrationId}";
+
+    private final Environment env;
+
+    public DiscordOAuth2Config(Environment env) {
+        this.env = env;
+    }
+
+    @Bean
+    public ClientRegistrationRepository discordClientRegistrationRepository() {
+        String clientId = env.getProperty(DISCORD_CLIENT_PROPERTY_KEY + ".client-id");
+        String clientSecret = env.getProperty(DISCORD_CLIENT_PROPERTY_KEY + ".client-secret");
+
+        ClientRegistration clientRegistration = ClientRegistration.withRegistrationId("discord")
+                .clientAuthenticationMethod(ClientAuthenticationMethod.CLIENT_SECRET_BASIC)
+                .authorizationGrantType(AuthorizationGrantType.AUTHORIZATION_CODE)
+                .redirectUri(DEFAULT_REDIRECT_URL)
+                .scope("identify", "email")
+                .authorizationUri("https://discord.com/api/oauth2/authorize")
+                .tokenUri("https://discord.com/api/oauth2/token")
+                .userInfoUri("https://discord.com/api/users/@me")
+                // revokeTokenUri: https://discord.com/api/oauth2/token/revoke
+                .userNameAttributeName("username")
+                .clientName("Discord")
+                .clientId(clientId)
+                .clientSecret(clientSecret)
+                .build();
+
+        return new InMemoryClientRegistrationRepository(clientRegistration);
+    }
+
+    @Bean
+    public OAuth2AuthorizedClientService discordAuthorizedClientService(ClientRegistrationRepository clientRegistrationRepository) {
+        return new InMemoryOAuth2AuthorizedClientService(clientRegistrationRepository);
+    }
+}

src/main/java/example/oauth2/discord/config/MvcConfig.java

@@ -0,0 +1,15 @@
+package example.oauth2.discord.config;
+
+import org.springframework.context.annotation.Configuration;
+import org.springframework.web.servlet.config.annotation.ViewControllerRegistry;
+import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
+
+@Configuration
+public class MvcConfig implements WebMvcConfigurer {
+
+    @Override
+    public void addViewControllers(ViewControllerRegistry registry) {
+        registry.addViewController("/").setViewName("index");
+        registry.addViewController("/secret").setViewName("secret");
+    }
+}

src/main/java/example/oauth2/discord/config/WebSecurityConfig.java

@@ -0,0 +1,37 @@
+package example.oauth2.discord.config;
+
+import org.springframework.context.annotation.Configuration;
+import org.springframework.security.config.annotation.web.builders.HttpSecurity;
+import org.springframework.security.config.annotation.web.configuration.EnableWebSecurity;
+import org.springframework.security.config.annotation.web.configuration.WebSecurityConfigurerAdapter;
+import org.springframework.security.oauth2.client.OAuth2AuthorizedClientService;
+import org.springframework.security.oauth2.client.registration.ClientRegistrationRepository;
+
+@EnableWebSecurity
+@Configuration
+public class WebSecurityConfig extends WebSecurityConfigurerAdapter {
+
+    private final ClientRegistrationRepository clientRegistrationRepository;
+    private final OAuth2AuthorizedClientService authorizedClientService;
+
+    public WebSecurityConfig(ClientRegistrationRepository discordClientRegistrationRepository,
+                             OAuth2AuthorizedClientService discordAuthorizedClientService) {
+        this.clientRegistrationRepository = discordClientRegistrationRepository;
+        this.authorizedClientService = discordAuthorizedClientService;
+    }
+
+    @Override
+    protected void configure(HttpSecurity http) throws Exception {
+        //@formatter:off
+        http
+                .authorizeRequests()
+                    .antMatchers("/").permitAll() //Доступ разрешен всем пользователей
+                    .anyRequest().authenticated() //Все остальные страницы требуют аутентификации
+                    .and()
+                .oauth2Login()
+                    .clientRegistrationRepository(clientRegistrationRepository)
+                    .authorizedClientService(authorizedClientService)
+                ;
+        //@formatter:on
+    }
+}

src/main/resources/application.yml

@@ -0,0 +1,14 @@
+server:
+  address: 127.0.0.1
+  port: 8080
+
+debug: false
+
+spring:
+  security:
+    oauth2:
+      client:
+        registration:
+          discord:
+            client-id: 965013316982423632
+            client-secret: yhb13RP26WxfOru9fcQ6CxPcAUWr_2q6

src/main/resources/templates/index.html

@@ -0,0 +1,18 @@
+<!DOCTYPE html>
+<html lang="ru"
+      xmlns="http://www.w3.org/1999/xhtml"
+      xmlns:th="https://www.thymeleaf.org">
+<head>
+    <title>Discord OAuth2 Example</title>
+    <link rel="icon" href="data:;base64,=">
+</head>
+<body>
+<h1>Discord OAuth2 Example</h1>
+<hr>
+<p>
+    Home public page<br>
+    ---&gt; <a th:href="@{/secret}">Secret Page</a> &lt;---<br>
+    [ <a th:href="@{/oauth2/authorization/discord}">Login Discord</a> ]
+</p>
+</body>
+</html>

src/main/resources/templates/secret.html

@@ -0,0 +1,12 @@
+<!DOCTYPE html>
+<html lang="ru">
+<head>
+    <title>Discord OAuth2 Example</title>
+    <link rel="icon" href="data:;base64,=">
+</head>
+<body>
+<h1>Discord OAuth2 Example</h1>
+<hr>
+<p style="color: red">[TOP SECRET PAGE]</p>
+</body>
+</html>