Add admin notifications for new Mastodon versions (#26582)

app/controllers/admin/software_updates_controller.rb

@@ -0,0 +1,18 @@
+# frozen_string_literal: true
+
+module Admin
+  class SoftwareUpdatesController < BaseController
+    before_action :check_enabled!
+
+    def index
+      authorize :software_update, :index?
+      @software_updates = SoftwareUpdate.all.sort_by(&:gem_version)
+    end
+
+    private
+
+    def check_enabled!
+      not_found unless SoftwareUpdate.check_enabled?
+    end
+  end
+end

app/javascript/mastodon/features/home_timeline/components/critical_update_banner.tsx

@@ -0,0 +1,26 @@
+import { FormattedMessage } from 'react-intl';
+
+export const CriticalUpdateBanner = () => (
+  <div className='warning-banner'>
+    <div className='warning-banner__message'>
+      <h1>
+        <FormattedMessage
+          id='home.pending_critical_update.title'
+          defaultMessage='Critical security update available!'
+        />
+      </h1>
+      <p>
+        <FormattedMessage
+          id='home.pending_critical_update.body'
+          defaultMessage='Please update your Mastodon server as soon as possible!'
+        />{' '}
+        <a href='/admin/software_updates'>
+          <FormattedMessage
+            id='home.pending_critical_update.link'
+            defaultMessage='See updates'
+          />
+        </a>
+      </p>
+    </div>
+  </div>
+);

app/javascript/mastodon/features/home_timeline/index.jsx

@@ -14,7 +14,7 @@ import { fetchAnnouncements, toggleShowAnnouncements } from 'mastodon/actions/an
 import { IconWithBadge } from 'mastodon/components/icon_with_badge';
 import { NotSignedInIndicator } from 'mastodon/components/not_signed_in_indicator';
 import AnnouncementsContainer from 'mastodon/features/getting_started/containers/announcements_container';
-import { me } from 'mastodon/initial_state';
+import { me, criticalUpdatesPending } from 'mastodon/initial_state';
 
 import { addColumn, removeColumn, moveColumn } from '../../actions/columns';
 import { expandHomeTimeline } from '../../actions/timelines';
@@ -23,6 +23,7 @@ import ColumnHeader from '../../components/column_header';
 import StatusListContainer from '../ui/containers/status_list_container';
 
 import { ColumnSettings } from './components/column_settings';
+import { CriticalUpdateBanner } from './components/critical_update_banner';
 import { ExplorePrompt } from './components/explore_prompt';
 
 const messages = defineMessages({
@@ -156,8 +157,9 @@ class HomeTimeline extends PureComponent {
     const { intl, hasUnread, columnId, multiColumn, tooSlow, hasAnnouncements, unreadAnnouncements, showAnnouncements } = this.props;
     const pinned = !!columnId;
     const { signedIn } = this.context.identity;
+    const banners = [];
 
-    let announcementsButton, banner;
+    let announcementsButton;
 
     if (hasAnnouncements) {
       announcementsButton = (
@@ -173,8 +175,12 @@ class HomeTimeline extends PureComponent {
       );
     }
 
+    if (criticalUpdatesPending) {
+      banners.push(<CriticalUpdateBanner key='critical-update-banner' />);
+    }
+
     if (tooSlow) {
-      banner = <ExplorePrompt />;
+      banners.push(<ExplorePrompt key='explore-prompt' />);
     }
 
     return (
@@ -196,7 +202,7 @@ class HomeTimeline extends PureComponent {
 
         {signedIn ? (
           <StatusListContainer
-            prepend={banner}
+            prepend={banners}
             alwaysPrepend
             trackScroll={!pinned}
             scrollKey={`home_timeline-${columnId}`}

app/javascript/mastodon/initial_state.js

@@ -87,6 +87,7 @@
  * @typedef InitialState
  * @property {Record<string, Account>} accounts
  * @property {InitialStateLanguage[]} languages
+ * @property {boolean=} critical_updates_pending
  * @property {InitialStateMeta} meta
  */
 
@@ -140,6 +141,7 @@ export const useBlurhash = getMeta('use_blurhash');
 export const usePendingItems = getMeta('use_pending_items');
 export const version = getMeta('version');
 export const languages = initialState?.languages;
+export const criticalUpdatesPending = initialState?.critical_updates_pending;
 // @ts-expect-error
 export const statusPageUrl = getMeta('status_page_url');
 export const sso_redirect = getMeta('sso_redirect');

app/javascript/mastodon/locales/en.json

@@ -310,6 +310,9 @@
   "home.explore_prompt.body": "Your home feed will have a mix of posts from the hashtags you've chosen to follow, the people you've chosen to follow, and the posts they boost. If that feels too quiet, you may want to:",
   "home.explore_prompt.title": "This is your home base within Mastodon.",
   "home.hide_announcements": "Hide announcements",
+  "home.pending_critical_update.body": "Please update your Mastodon server as soon as possible!",
+  "home.pending_critical_update.link": "See updates",
+  "home.pending_critical_update.title": "Critical security update available!",
   "home.show_announcements": "Show announcements",
   "interaction_modal.description.favourite": "With an account on Mastodon, you can favorite this post to let the author know you appreciate it and save it for later.",
   "interaction_modal.description.follow": "With an account on Mastodon, you can follow {name} to receive their posts in your home feed.",

app/javascript/styles/mastodon/admin.scss

@@ -143,6 +143,11 @@ $content-width: 840px;
         }
       }
 
+      .warning a {
+        color: $gold-star;
+        font-weight: 700;
+      }
+
       .simple-navigation-active-leaf a {
         color: $primary-text-color;
         background-color: $ui-highlight-color;

app/javascript/styles/mastodon/components.scss

@@ -8860,7 +8860,8 @@ noscript {