Add a wsgi wrapper to tahrir to handle our reverse proxy setup.

roles/badges-frontend/files/tahrir.wsgi

@@ -1,4 +1,4 @@
-import sys                                              
+import sys
 sys.stdout = sys.stderr
 
 import __main__
@@ -12,4 +12,12 @@ os.environ['PYTHON_EGG_CACHE'] = '/var/www/.python-eggs'
 from pyramid.paster import get_app, setup_logging
 ini_path = '/etc/tahrir/tahrir.ini'
 setup_logging(ini_path)
-application = get_app(ini_path, 'main')
+
+pyramid_app = get_app(ini_path, 'main')
+
+def reverse_proxy_handler(environ, start_response):
+    environ['HTTP_HOST'] = environ['HTTP_X_FORWARDED_HOST']
+    environ['wsgi.url_scheme'] = 'https'
+    return pyramid_app(environ, start_response)
+
+application = reverse_proxy_handler