Okhttp3实现GitHub第三方登录

Okhttp3具体简介及使用：https://www.jianshu.com/p/9ee7b47d4f43

GitHubOAuth 服务：

• 打开 Setting > Developer setting > OAuth applications
• 点击 Register a new application
• 填入基本的信息 创建成功

第三方登录具体流程：

• 用户点击Github登录
• 应用发送授权请求到GitHub(https://github.com/login/oauth/authorize)
• 输入账号密码授权登录
• 返回回调地址(code：授权码) http://?/oauth/callback?code=?
• post请求获取access_token(https://github.com/login/oauth/access_token)并带上client_id,client_secret,code参数
• 返回access_token 并请求用户信息 返回用户信息(https://api.github.com/user?access_token=xxx)

具体例子代码：

• 用户返回信息类

public class GithubUser {
    private String name;
    private Long id;
    private String bio;
    private String avatarUrl;
}

• OAuth参数类

public class AccessTokenDTO {
    private String client_id;
    private String client_secret;
    private String code;
    private String redirect_url;
    private String state;

}

• 实现类

  public class GithubProvider {
      public String getAccessToken(AccessTokenDTO accessTokenDTO){
          MediaType mediaType = MediaType.get("application/json; charset=utf-8");
          OkHttpClient client = new OkHttpClient();
          RequestBody body = RequestBody.create(mediaType, JSON.toJSONString(accessTokenDTO));
          Request request = new Request.Builder()
                      .url("https://github.com/login/oauth/access_token")
                      .post(body)
                      .build();
              try (Response response = client.newCall(request).execute()) {
                  String string = response.body().string();
                  String token = string.split("&")[0].split("=")[1];
                  return token;
          } catch (Exception e) {
                  e.printStackTrace();
              }
              return null;
      }
      public GithubUser getUser(String accessToken){
          OkHttpClient client = new OkHttpClient();
          Request request = new Request.Builder()
                  .url("https://api.github.com/user?access_token="+accessToken)
                  .build();
          try {
              Response response = client.newCall(request).execute();
              String string = response.body().string();
              GithubUser githubUser = JSON.parseObject(string, GithubUser.class);
              return githubUser;
          } catch (IOException e) {
              return null;
          }
      }
  }
  
  
  AccessTokenDTO accessTokenDTO = new AccessTokenDTO();
          accessTokenDTO.setClient_id("XXX");
          accessTokenDTO.setClient_secret("XXX");
          accessTokenDTO.setCode(code);
          accessTokenDTO.setRedirect_url("http://XXX/callback");
          accessTokenDTO.setState(state);
          String accessToken = githubProvider.getAccessToken(accessTokenDTO);
          GithubUser githubUser = githubProvider.getUser(accessToken);
          if(githubUser != null && githubUser.getId() !=null){
              User user = new User();
              String token = UUID.randomUUID().toString();
              user.setToken(token);
              user.setName(githubUser.getName());
              user.setAccountId(String.valueOf(githubUser.getId()));
              user.setAvatarUrl(githubUser.getAvatarUrl());
              userService.createOrUpdate(user);
              response.addCookie(new Cookie("token",token));
              return "redirect:/";
          }else{
              //登录失败 重新登录
              return "redirect:/";
          }
      }