Improve web api protect (#6343)

app/controllers/api/web/base_controller.rb

+# frozen_string_literal: true
+
+class Api::Web::BaseController < Api::BaseController
+  protect_from_forgery with: :exception
+
+  rescue_from ActionController::InvalidAuthenticityToken do
+    render json: { error: "Can't verify CSRF token authenticity." }, status: 422
+  end
+end

app/controllers/api/web/embeds_controller.rb

 # frozen_string_literal: true
 
-class Api::Web::EmbedsController < Api::BaseController
+class Api::Web::EmbedsController < Api::Web::BaseController
   respond_to :json
 
   before_action :require_user!

app/controllers/api/web/push_subscriptions_controller.rb

 # frozen_string_literal: true
 
-class Api::Web::PushSubscriptionsController < Api::BaseController
+class Api::Web::PushSubscriptionsController < Api::Web::BaseController
   respond_to :json
 
   before_action :require_user!
-  protect_from_forgery with: :exception
 
   def create
     active_session = current_session

app/controllers/api/web/settings_controller.rb

 # frozen_string_literal: true
 
-class Api::Web::SettingsController < Api::BaseController
+class Api::Web::SettingsController < Api::Web::BaseController
   respond_to :json
 
   before_action :require_user!

app/javascript/mastodon/actions/push_notifications/registerer.js

@@ -36,7 +36,7 @@ const subscribe = (registration) =>
 const unsubscribe = ({ registration, subscription }) =>
   subscription ? subscription.unsubscribe().then(() => registration) : registration;
 
-const sendSubscriptionToBackend = (getState, subscription) => {
+const sendSubscriptionToBackend = (subscription) => {
   const params = { subscription };
 
   if (me) {
@@ -46,7 +46,7 @@ const sendSubscriptionToBackend = (getState, subscription) => {
     }
   }
 
-  return api(getState).post('/api/web/push_subscriptions', params).then(response => response.data);
+  return api().post('/api/web/push_subscriptions', params).then(response => response.data);
 };
 
 // Last one checks for payload support: https://web-push-book.gauntface.com/chapter-06/01-non-standards-browsers/#no-payload
@@ -85,13 +85,13 @@ export function register () {
             } else {
               // Something went wrong, try to subscribe again
               return unsubscribe({ registration, subscription }).then(subscribe).then(
-                subscription => sendSubscriptionToBackend(getState, subscription));
+                subscription => sendSubscriptionToBackend(subscription));
             }
           }
 
           // No subscription, try to subscribe
           return subscribe(registration).then(
-            subscription => sendSubscriptionToBackend(getState, subscription));
+            subscription => sendSubscriptionToBackend(subscription));
         })
         .then(subscription => {
           // If we got a PushSubscription (and not a subscription object from the backend)
@@ -134,7 +134,7 @@ export function saveSettings() {
     const alerts = state.get('alerts');
     const data = { alerts };
 
-    api(getState).put(`/api/web/push_subscriptions/${subscription.get('id')}`, {
+    api().put(`/api/web/push_subscriptions/${subscription.get('id')}`, {
       data,
     }).then(() => {
       if (me) {

app/javascript/mastodon/actions/settings.js

@@ -24,7 +24,7 @@ const debouncedSave = debounce((dispatch, getState) => {
 
   const data = getState().get('settings').filter((_, path) => path !== 'saved').toJS();
 
-  api(getState).put('/api/web/settings', { data })
+  api().put('/api/web/settings', { data })
     .then(() => dispatch({ type: SETTING_SAVE }))
     .catch(error => dispatch(showAlertForError(error)));
 }, 5000, { trailing: true });