Merge branch 'refactoring_group_controllers' into 'master'

Group controllers refactoring

Usefulness of this refactoring is not so obvious on CE codebase. But It will allow us to remove huge amount of code on the EE side.

See merge request !1684

app/controllers/groups/application_controller.rb

+class Groups::ApplicationController < ApplicationController
+
+  private
+  
+  def authorize_admin_group!
+    unless can?(current_user, :manage_group, group)
+      return render_404
+    end
+  end
+end

app/controllers/groups/group_members_controller.rb

-class Groups::GroupMembersController < ApplicationController
+class Groups::GroupMembersController < Groups::ApplicationController
   before_filter :group
 
   # Authorize
@@ -37,12 +37,6 @@ class Groups::GroupMembersController < ApplicationController
     @group ||= Group.find_by(path: params[:group_id])
   end
 
-  def authorize_admin_group!
-    unless can?(current_user, :manage_group, group)
-      return render_404
-    end
-  end
-
   def member_params
     params.require(:group_member).permit(:access_level, :user_id)
   end

app/controllers/groups_controller.rb

-class GroupsController < ApplicationController
+class GroupsController < Groups::ApplicationController
   skip_before_filter :authenticate_user!, only: [:show, :issues, :members, :merge_requests]
   respond_to :html
   before_filter :group, except: [:new, :create]
@@ -132,12 +132,6 @@ class GroupsController < ApplicationController
     end
   end
 
-  def authorize_admin_group!
-    unless can?(current_user, :manage_group, group)
-      return render_404
-    end
-  end
-
   def set_title
     @title = 'New Group'
   end