Monkey patch: force django-social-auth's OAuth2 redirect_uris to start with 'https://'

patch_django_social_auth_oauth2_redirect_uri.py

from django.core.signals import request_started
from django.dispatch import receiver

# signals
@receiver(request_started)
def monkey_patch_redirect_uri(sender, **kwargs):
	'''
	Apply a cheesy hack to fix a glitch in social_auth: 
	* social_auth.backends.BaseOAuth2.__init__ calculates self.redirect_uri using request.build_absolute_uri
	* django.http.request.build_absolute_uri uses the scheme of the current request
	* if you're using heroku, or the app is behind a reverse proxy, all requests appear to be over HTTP, not HTTPS
	* thus all redirect_uris specified to the OAuth2 provider specify HTTP, causing problems

	This patch moves the 'redirect_uri' attrib to '_redirect_uri', and then substitutes a getter/setter combo
	to replace URLs starting with 'http://' with 'https://'.

	To use it, put this into something loaded early by Django - your app's models.py might be a good place.
	'''
	import social_auth.backends
	def set_redirect_uri(self, redirect_uri):
		self._redirect_uri = redirect_uri
 
	def get_redirect_uri(self):
	    return self._redirect_uri.replace('http://', 'https://') if self._redirect_uri.startswith('http://') else self._redirect_uri

	social_auth.backends.BaseOAuth2.redirect_uri = property(get_redirect_uri, set_redirect_uri)