sns auth
Universal third-party login SDK, support WeChat, WeChat scan code, etc
...In the interface file, 4 methods are defined, which must be implemented by each third-party base class, and are used for related third-party login operations and data acquisition. WeChat has an additional method for obtaining the address requested by the proxy. Version 2.0 no longer automatically sets the state through the system. If necessary, please handle the verification by yourself, and the state can also be put in the config. Line and Facebook are mandatory to pass state, if you don't set it, random value will be passed.