add google oauth2

google/README.MD

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+# Spring Boot + OAuth2 Google
+
+<img alt="Spring Boot" width="auto" height="100" src="../docs/spring-boot.svg">
+<img alt="Discord" width="auto" height="100" src="docs/google.svg">
+
+## Перед запуском
+### Создание OAuth
+Для запуска понадобиться обзавестить своим **Google OAuth**.
+
+1. Переходим в [Google APIs console credentials](https://console.cloud.google.com/apis/credentials?project=silent-fuze-322306)
+2. Создаём новый OAuth Client ID  
+  ![](docs/1.png)
+3. Заполняем обязательно следующие поля
+   - **Application type**: `Web application`
+   - **Homepage URL**: `http://127.0.0.1:8080`
+   - **Authorization callback URL**: `http://127.0.0.1:8080/login/oauth2/code/google`  
+  ![](docs/2.png)
+5. Получаем **Client secret/Client ID**  
+  ![](docs/3.png)
+
+### Настройка Spring
+Открываем файл `src/main/resources/application.yml` и указываем там **Client ID** и **Client secrets**:
+
+```yaml
+spring:
+  security:
+    oauth2:
+      client:
+        registration:
+          google:
+            client-id: 704750524716-tnqc2islqao8tobjbrgvtte0fq8o39uv.apps.googleusercontent.com
+            client-secret: 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
+```

google/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 = JavaVersion.VERSION_11
+
+repositories {
+    mavenCentral()
+}
+
+dependencies {
+    implementation('org.springframework.boot:spring-boot-starter-web')
+    implementation('org.springframework.boot:spring-boot-starter-freemarker')
+
+    implementation('org.springframework.boot:spring-boot-starter-security')
+    implementation('org.springframework.security:spring-security-oauth2-client')
+    implementation('org.springframework.security:spring-security-oauth2-jose:5.6.3')
+}

google/docs/google.svg

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+<?xml version="1.0" encoding="utf-8"?>
+<svg viewBox="0 0 24 24" width="24" height="24" xmlns="http://www.w3.org/2000/svg">
+  <g transform="matrix(1, 0, 0, 1, 27.009001, -39.238998)">
+    <path fill="#4285F4" d="M -3.264 51.509 C -3.264 50.719 -3.334 49.969 -3.454 49.239 L -14.754 49.239 L -14.754 53.749 L -8.284 53.749 C -8.574 55.229 -9.424 56.479 -10.684 57.329 L -10.684 60.329 L -6.824 60.329 C -4.564 58.239 -3.264 55.159 -3.264 51.509 Z"/>
+    <path fill="#34A853" d="M -14.754 63.239 C -11.514 63.239 -8.804 62.159 -6.824 60.329 L -10.684 57.329 C -11.764 58.049 -13.134 58.489 -14.754 58.489 C -17.884 58.489 -20.534 56.379 -21.484 53.529 L -25.464 53.529 L -25.464 56.619 C -23.494 60.539 -19.444 63.239 -14.754 63.239 Z"/>
+    <path fill="#FBBC05" d="M -21.484 53.529 C -21.734 52.809 -21.864 52.039 -21.864 51.239 C -21.864 50.439 -21.724 49.669 -21.484 48.949 L -21.484 45.859 L -25.464 45.859 C -26.284 47.479 -26.754 49.299 -26.754 51.239 C -26.754 53.179 -26.284 54.999 -25.464 56.619 L -21.484 53.529 Z"/>
+    <path fill="#EA4335" d="M -14.754 43.989 C -12.984 43.989 -11.404 44.599 -10.154 45.789 L -6.734 42.369 C -8.804 40.429 -11.514 39.239 -14.754 39.239 C -19.444 39.239 -23.494 41.939 -25.464 45.859 L -21.484 48.949 C -20.534 46.099 -17.884 43.989 -14.754 43.989 Z"/>
+  </g>
+</svg>

google/src/main/java/example/oauth2/google/ApplicationGoogle.java

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+package example.oauth2.google;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class ApplicationGoogle {
+
+    public static void main(String[] args) {
+        SpringApplication.run(ApplicationGoogle.class, args);
+    }
+
+}

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

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+package example.oauth2.google.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");
+    }
+}

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

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+package example.oauth2.google.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;
+
+@EnableWebSecurity
+@Configuration
+public class WebSecurityConfig extends WebSecurityConfigurerAdapter {
+
+    @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()
+                ;
+        //@formatter:on
+    }
+}

google/src/main/resources/application.yml

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+server:
+  address: 127.0.0.1
+  port: 8080
+
+debug: false
+
+spring:
+  freemarker:
+    template-loader-path: classpath:/templates
+    suffix: .ftlh
+  security:
+    oauth2:
+      client:
+        registration:
+          google:
+            client-id: 704750524716-tnqc2islqao8tobjbrgvtte0fq8o39uv.apps.googleusercontent.com
+            client-secret: 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

google/src/main/resources/templates/includes/foother.ftlh

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+</body>
+</html>

google/src/main/resources/templates/includes/header.ftlh

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+<!DOCTYPE html>
+<html lang="ru">
+<head>
+    <title>Google OAuth2 Example</title>
+    <link rel="icon" href="data:;base64,=">
+</head>
+<body>
+<h1>Google OAuth2 Example</h1>
+<hr>

google/src/main/resources/templates/index.ftlh

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+<#include "includes/header.ftlh">
+<p>
+    Home public page<br>
+    ---&gt; <a href="/secret">Secret Page</a> &lt;---<br>
+    [ <a href="/oauth2/authorization/google">Login Google</a> ]
+</p>
+<#include "includes/foother.ftlh">

google/src/main/resources/templates/secret.ftlh

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+<#include "includes/header.ftlh">
+<p style="color: red">[TOP SECRET PAGE]</p>
+<#include "includes/foother.ftlh">