Class: AuthGithubController

Github controller

Flow of how github works:

Client call auth/github/login to be redirected to github login page to require authentication
After authorized by github, the user will be redirected to the callback url defined in the config
The auth/github/callback url will be called with the code as a query parameter
The code will be used to get the access token and user profile from github
The user profile will be used to create a new user or return the existing user from federated module
The user will be authenticated and a token will be issued
The token will be returned to the client
The client can use the token to make requests to the protected resources