Ensure push subscription is immediately removed when application is revoked (#7548)

* Ensure push subscription is immediately removed when application is revoked

* When token is revoked from app, unsubscribe too

app/controllers/oauth/tokens_controller.rb

@@ -0,0 +1,14 @@
+# frozen_string_literal: true
+
+class Oauth::TokensController < Doorkeeper::TokensController
+  def revoke
+    unsubscribe_for_token if authorized? && token.accessible?
+    super
+  end
+
+  private
+
+  def unsubscribe_for_token
+    Web::PushSubscription.where(access_token_id: token.id).delete_all
+  end
+end