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@@ -0,0 +1,180 @@
+## 1. 申请应用
+
+### 1.1 创建第三方授权应用
+
+1. 登录 Google 开发者中心：[Google 开发者中心](https://console.developers.google.com/apis/dashboard)
+2. 点击新建项目：[新建项目](https://console.developers.google.com/projectcreate)
+![](doc/media/oauth/9be5f37d.png)
+3. 确保在第二步新建的项目下，选择“API 和服务”-“凭据”
+![](doc/media/oauth/c21dfd9d.png)
+4. 创建凭据
+![](doc/media/oauth/1948c22c.png)
+    1. 创建凭据时，选择 “OAuth 客户端 ID”    
+    ![](doc/media/oauth/1d964020.png)
+    2. 首次创建凭据时系统会提示“如需创建 OAuth 客户端 ID，您必须先在同意屏幕上设置产品名称”，根据提示进行操作    
+    ![](doc/media/oauth/e872ae95.png)
+    3. 选择 “User Type”    
+    ![](doc/media/oauth/43da8d81.png)
+    这一步根据项目具体的用途进行选择，一般选择“外部”即可 
+    4. 以上内容操作完成后，接下来就需要配置“OAuth 同意屏幕”的详情    
+    ![](doc/media/oauth/ad124405.png)
+    5. 第四步保存后，会提示需要验证应用，如下 
+    ![](doc/media/oauth/ca0d1373.png)  
+    > 注：_如果仅作测试使用，则可以直接忽略这个验证操作，直接进入下一步，否则的话，建议按照提示进行验证。_  
+    6. 这个时候我们直接再次访问 “凭据” - “创建凭据” - “OAuth 客户端 ID”，选择“Web 应用”，然后按照提示填入内容
+    ![](doc/media/oauth/db8c8470.png)
+    保存信息后，会弹出密钥和ID
+    ![](doc/media/oauth/568d2287.png)
+
+记录以下三个信息：`Client ID`、`Client Secret`和`回调地址`，后面我们会用到。
+
+**重要提示：“应用密钥”可保护你应用程序的安全，因此请确保其不会泄露！也不要与任何人共享你的“应用密钥”！！！**
+
+## 2. 集成JustAuth
+
+### 2.1 引入依赖
+
+```xml
+<dependency>
+  <groupId>me.zhyd.oauth</groupId>
+  <artifactId>JustAuth</artifactId>
+  <version>${latest.version}</version>
+</dependency>
+```
+
+`${latest.version}`表示当前最新的版本，可以在[这儿](https://github.com/justauth/JustAuth/releases)获取最新的版本信息。
+
+### 2.2 创建Request
+
+```java
+AuthRequest authRequest = new AuthGoogleRequest(AuthConfig.builder()
+                .clientId("Client ID")
+                .clientSecret("Client Secret")
+                .redirectUri("应用回调地址")
+                // 针对国外平台配置代理
+                .httpConfig(HttpConfig.builder()
+                        .timeout(15000)
+                        // host 和 port 请修改为开发环境的参数
+                        .proxy(new Proxy(Proxy.Type.HTTP, new InetSocketAddress("127.0.0.1", 10080)))
+                        .build())
+                .build());
+```
+
+### 2.3 生成授权地址
+
+我们可以直接使用以下方式生成第三方平台的授权链接：
+```java
+String authorizeUrl = authRequest.authorize(AuthStateUtils.createState());
+```
+这个链接我们可以直接后台重定向跳转，也可以返回到前端后，前端控制跳转。前端控制的好处就是，可以将第三方的授权页嵌入到iframe中，适配网站设计。
+
+
+### 2.4 以上完整代码如下
+
+```java
+import me.zhyd.oauth.config.AuthConfig;
+import me.zhyd.oauth.request.AuthGoogleRequest;
+import me.zhyd.oauth.model.AuthCallback;
+import me.zhyd.oauth.request.AuthRequest;
+import me.zhyd.oauth.utils.AuthStateUtils;
+import org.springframework.web.bind.annotation.PathVariable;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+import javax.servlet.http.HttpServletResponse;
+import java.io.IOException;
+import java.net.InetSocketAddress;
+import java.net.Proxy;
+
+
+@RestController
+@RequestMapping("/oauth")
+public class RestAuthController {
+
+    @RequestMapping("/render")
+    public void renderAuth(HttpServletResponse response) throws IOException {
+        AuthRequest authRequest = getAuthRequest();
+        response.sendRedirect(authRequest.authorize(AuthStateUtils.createState()));
+    }
+
+    @RequestMapping("/callback")
+    public Object login(AuthCallback callback) {
+        AuthRequest authRequest = getAuthRequest();
+        return authRequest.login(callback);
+    }
+
+    private AuthRequest getAuthRequest() {
+        return new AuthGoogleRequest(AuthConfig.builder()
+                .clientId("Client ID")
+                .clientSecret("Client Secret")
+                .redirectUri("回调地址")
+                // 针对国外平台配置代理
+                .httpConfig(HttpConfig.builder()
+                        .timeout(15000)
+                        // host 和 port 请修改为开发环境的参数
+                        .proxy(new Proxy(Proxy.Type.HTTP, new InetSocketAddress("127.0.0.1", 10080)))
+                        .build())
+                .build());
+    }
+}
+```
+授权链接访问成功后会看到以下页面内容：
+![](doc/media/oauth/87f95a28.png)
+
+点击“连接”即可完成百度的 OAuth 登录。
+
+## 3. 授权结果
+
+注：数据已脱敏
+
+```json
+{
+    "code":2000,
+    "data":{
+        "avatar":"https://lh3.googleusercontent.com/a-/AOh14GizW9_TgXF5rYQLXAmqJEdJybnnISagxAggbmDg",
+        "email":"yadong.zhang0415@gmail.com",
+        "gender":"UNKNOWN",
+        "location":"zh-CN",
+        "nickname":"HandsomeBoy丶",
+        "rawUserInfo":{
+            "sub":"11xxx9",
+            "email_verified":true,
+            "name":"HandsomeBoy丶",
+            "given_name":"HandsomeBoy丶",
+            "locale":"zh-CN",
+            "picture":"https://lh3.googleusercontent.com/a-/AOh14GizW9_TgXF5rYQLXAmqJEdJybnnISagxAggbmDg",
+            "email":"yadong.zhang0415@gmail.com"
+        },
+        "source":"GOOGLE",
+        "token":{
+            "accessToken":"",
+            "expireIn":3599,
+            "idToken":"",
+            "scope":"https://www.googleapis.com/auth/userinfo.profile https://www.googleapis.com/auth/userinfo.email openid",
+            "tokenType":"Bearer"
+        },
+        "username":"yadong.zhang0415@gmail.com",
+        "uuid":"11xxx9"
+    }
+}
+```
+
+## 3. 推荐
+
+官方推荐使用 [JustAuth-demo](https://github.com/justauth/JustAuth-demo) 示例项目进行测试。
+
+使用步骤：
+1. clone： [https://github.com/justauth/JustAuth-demo.git](https://github.com/justauth/JustAuth-demo.git)
+2. 将上面申请的应用信息填入到`RestAuthController#getAuthRequest`方法的对应位置中：
+![](doc/media/oauth/e1a40945.png)
+3. 启动项目，访问 [http://localhost:8443](http://localhost:8443)
+4. 选择对应的平台进行授权登录
+![](doc/media/oauth/da2bc692.png)
+5. 登录完成后，可以访问[http://localhost:8443/users](http://localhost:8443/users)查看已授权的用户
+![](doc/media/oauth/dbe6bcae.png)
+
+注：
+1. 如果直接使用 JustAuth-demo 项目进行测试，那么在配置测试应用的“回调地址”时要严格按照以下格式配置：`http://localhost:8443/oauth/callback/{平台名}`
+2. 平台名参考 `JustAuthPlatformInfo` 枚举类 `names`
+
+