Add global properties controller and action

There are a bunch of extensions that relies on this props. This PR
is attempting to add them inside `before_each_request` hook. If
url.endpoint contains dot, than part before dot will be considered
as controller and part after the dot - as action. otherwise(routes
without dot, like test /hello route), view name is used for both,
controller and action name

ckan/config/middleware/flask_app.py

@@ -32,6 +32,7 @@
 from ckan.views import (identify_user,
                         set_cors_headers_for_response,
                         check_session_cookie,
+                        set_controller_and_action
                         )
 
 
@@ -279,6 +280,10 @@ def ckan_before_request():
     # Sets g.user and g.userobj
     identify_user()
 
+    # Provide g.controller and g.action for backward compatibility
+    # with extensions
+    set_controller_and_action()
+
 
 def ckan_after_request(response):
     u'''Common handler executed after all Flask requests'''

ckan/views/__init__.py

@@ -179,3 +179,12 @@ def _get_user_for_apikey():
     query = model.Session.query(model.User)
     user = query.filter_by(apikey=apikey).first()
     return user
+
+
+def set_controller_and_action():
+    try:
+        controller, action = request.endpoint.split('.')
+    except ValueError:
+        log.debug('Endpoint does not contain dot: {}'.format(request.endpoint))
+        controller = action = request.endpoint
+    g.controller, g.action = controller, action