github-login-url

[amitu]

As part of adding auth support to fpm and implementing github basic support we will need a github login API

/github-login/

This API will take one optional argument, next. If nextis not passed its default value would be/`.

This URL will store the value of next somewhere, redirect user to Github OAuth page, and once the user authorised us, the user will be redirected back to the next url.

If the login fails, we will set the login-failed=<reason> query parameter to the next.

Where To Store next?

One option is we make next part of the callback URL. So say if the callback url is <oursite.com>/callback/, we will use <oursite.com>/callback/?next=<next> as callback URL.