OAuth callback URL is only formatted for HTTP

[nettoclaudio]

The OAuth callback URL scheme is hardcoded for http (see the code snippet below).

tsuru-dashboard/tsuru_dashboard/auth/views.py

Line 140 in e75ac66

callback_url = "http://{}/auth/callback/".format(self.request.META.get('HTTP_HOST'))

tsuru-dashboard/tsuru_dashboard/auth/views.py

Line 213 in e75ac66

redirect_url = "http://{}/auth/callback/".format(request.META.get('HTTP_HOST'))

The URL scheme should be formatted based on:

• the protocol used by app to run the server;
• the request headers such as Forwarded or X-Forwarded-Proto whenever dashboard app is running behind a reverse proxy or load balancer.