GRN2-155: Begin preparing for removal of Twitter accounts (#615)

* Add twitter deprecation message

* Fix rspec test

* Extract room switch to its own method

* update method name

app/helpers/application_helper.rb

@@ -33,7 +33,11 @@ module ApplicationHelper
 
   # Determines which providers can show a login button in the login modal.
   def iconset_providers
-    configured_providers & [:google, :twitter, :microsoft_office365]
+    providers = configured_providers & [:google, :twitter, :microsoft_office365]
+
+    providers.delete(:twitter) if session[:old_twitter_user_id]
+
+    providers
   end
 
   # Generates the login URL for a specific provider.

app/helpers/sessions_helper.rb

@@ -19,6 +19,8 @@
 module SessionsHelper
   # Logs a user into GreenLight.
   def login(user)
+    migrate_twitter_user(user)
+
     session[:user_id] = user.id
 
     # If there are not terms, or the user has accepted them, check for email verification
@@ -97,4 +99,24 @@ module SessionsHelper
         hd_opts
       end
   end
+
+  def migrate_twitter_user(user)
+    if !session["old_twitter_user_id"].nil? && user.provider != "twitter"
+      old_user = User.find(session["old_twitter_user_id"])
+
+      old_user.rooms.each do |room|
+        room.owner = user
+
+        room.name = "Old " + room.name if room.id == old_user.main_room.id
+
+        room.save!
+      end
+
+      # Query for the old user again so the migrated rooms don't get deleted
+      old_user.reload
+      old_user.destroy!
+
+      session["old_twitter_user_id"] = nil
+    end
+  end
 end