OAuth协议--PHP第三方登陆协议
慕课网Badguy老师的良心课程！
总会有那种什么都不想干的时候，但现在的日子又不这么允许个人的放纵，我一般就只有这几个选择：看课程视频，看书，看小说。。好像还是有可以做的事情。其中，看课程视频有点无聊一般，而且还得老子动手写代码。。找个好老师不错，嗯，最近跟着badguy学习吧~
做做笔记
1、关于OAuth
全称Open Authorization，开放协议；
是一个PHP实现第三方登录的协议；
具体实现就简化为三大步骤；
但我个人是这么记录的：
2、登陆前
需要到“签订”该协议的网站进行申请/注册（打算实现第三方登录的网站，比如慕课网到qq申请）；
得到网站唯一的client_id，以及client_secret;
3、登陆时
用户点击“其他登陆”——》（三大步骤之第一步）网站向QQ OAuth服务器发请求，Request Token URL，请求服务地址，如下所示
https://graph.qq.com/oauth/...
client_id=100490398&...
redirect_uri=http%3A%2F%2Fpassport.mukewang.com%...
首先有个oauth标识，然后是client_id，然后是redirect_uri重新定向地址，也就是返回地址；
——》（第二步）用户看到第三方登陆界面，进行信息输入；这里会根据用户输入生成code，用户看不到，后台直接生成了；
——》（第三步）QQ auth服务器返回状态给网站，安全起见有一个User authorization URL，这里会有code，client_id，client_secret信息进行验证，同时code也有生命周期（很短，可能就5s）；
4、登陆后
除了实现第三方登录，OAuth还允许授权后的网站进行一些功能，比如qq的一键发空间之类的，这时候就有AccessToken（令牌），生命周期一般为7天吧；没有了了的话，可以重新登陆申请，也有RefreshToken，会自动刷新令牌；
5、其他
关于开放，即可以指对内部的开放——比如淘宝一个号，支付宝什么的阿里系列都可以用；
对外部——比如腾讯账号到处插。。
最后一图
后续接着学习QQ登陆，weibo登陆啦~
------------5min后的更新--------------
火丁笔记这个写的也不错，通俗易懂，有图有例，5min看完。
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