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我APP端要做第三方登录，但是后台不知道第三方登录的逻辑和处理是怎么样的，让我把需求和数据给他。我想知道第三方登录的逻辑是什么，还有一般需要获取的数据。谢谢！！PS.后台使用.net。
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以微信为例，客户端去请求微信登录授权接口，在用户同意授权以后会拿到用户的微信的openid，由客户端把这个openid传给后端服务器，在后端服务器进行把这个openid和用户的userid进行绑定。
第三方平台和本地用户系统结合应该分为三种情况：
本地未登录，第一次登录第三方：此时相当于注册，直接把第三方信息拉取来并注册成本地用户就可以了，并建立本地用户与第三方用户（openid）的绑定关系
本地未登录，再次登录第三方：此时用户已注册，获取到openid后直接找出对应的本地用户即可
本地登录，并绑定第三方： 这个只要将获取到的openid绑定到本地用户就可以了
跟后台用什么语言都没关系 第三方登录背后是OAuth协议，现在是2.0版本
2016-11-07 15:14:25
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