Add admin notifications for new Mastodon versions (#26582)

config/locales/en.yml

@@ -309,6 +309,7 @@ en:
       unpublish: Unpublish
       unpublished_msg: Announcement successfully unpublished!
       updated_msg: Announcement successfully updated!
+    critical_update_pending: Critical update pending
     custom_emojis:
       assign_category: Assign category
       by_domain: Domain
@@ -779,6 +780,18 @@ en:
     site_uploads:
       delete: Delete uploaded file
       destroyed_msg: Site upload successfully deleted!
+    software_updates:
+      critical_update: Critical — please update quickly
+      description: It is recommended to keep your Mastodon installation up to date to benefit from the latest fixes and features. Moreover, it is sometimes critical to update Mastodon in a timely manner to avoid security issues. For these reasons, Mastodon checks for updates every 30 minutes, and will notify you according to your e-mail notification preferences.
+      documentation_link: Learn more
+      release_notes: Release notes
+      title: Available updates
+      type: Type
+      types:
+        major: Major release
+        minor: Minor release
+        patch: Patch release — bugfixes and easy to apply changes
+      version: Version
     statuses:
       account: Author
       application: Application
@@ -843,6 +856,12 @@ en:
         message_html: You haven't defined any server rules.
       sidekiq_process_check:
         message_html: No Sidekiq process running for the %{value} queue(s). Please review your Sidekiq configuration
+      software_version_critical_check:
+        action: See available updates
+        message_html: A critical Mastodon update is available, please update as quickly as possible.
+      software_version_patch_check:
+        action: See available updates
+        message_html: A bugfix Mastodon update is available.
       upload_check_privacy_error:
         action: Check here for more information
         message_html: "<strong>Your web server is misconfigured. The privacy of your users is at risk.</strong>"
@@ -956,6 +975,9 @@ en:
       body: "%{target} is appealing a moderation decision by %{action_taken_by} from %{date}, which was %{type}. They wrote:"
       next_steps: You can approve the appeal to undo the moderation decision, or ignore it.
       subject: "%{username} is appealing a moderation decision on %{instance}"
+    new_critical_software_updates:
+      body: New critical versions of Mastodon have been released, you may want to update as soon as possible!
+      subject: Critical Mastodon updates are available for %{instance}!
     new_pending_account:
       body: The details of the new account are below. You can approve or reject this application.
       subject: New account up for review on %{instance} (%{username})
@@ -963,6 +985,9 @@ en:
       body: "%{reporter} has reported %{target}"
       body_remote: Someone from %{domain} has reported %{target}
       subject: New report for %{instance} (#%{id})
+    new_software_updates:
+      body: New Mastodon versions have been released, you may want to update!
+      subject: New Mastodon versions are available for %{instance}!
     new_trends:
       body: 'The following items need a review before they can be displayed publicly:'
       new_trending_links:

config/locales/simple_form.en.yml

@@ -291,6 +291,12 @@ en:
         pending_account: New account needs review
         reblog: Someone boosted your post
         report: New report is submitted
+        software_updates:
+          all: Notify on all updates
+          critical: Notify on critical updates only
+          label: A new Mastodon version is available
+          none: Never notify of updates (not recommended)
+          patch: Notify on bugfix updates
         trending_tag: New trend requires review
       rule:
         text: Rule

config/navigation.rb

@@ -3,6 +3,9 @@
 SimpleNavigation::Configuration.run do |navigation|
   navigation.items do |n|
     n.item :web, safe_join([fa_icon('chevron-left fw'), t('settings.back')]), root_path
+
+    n.item :software_updates, safe_join([fa_icon('exclamation-circle fw'), t('admin.critical_update_pending')]), admin_software_updates_path, if: -> { ENV['UPDATE_CHECK_URL'] != '' && current_user.can?(:view_devops) && SoftwareUpdate.urgent_pending? }, html: { class: 'warning' }
+
     n.item :profile, safe_join([fa_icon('user fw'), t('settings.profile')]), settings_profile_path, if: -> { current_user.functional? }, highlights_on: %r{/settings/profile|/settings/featured_tags|/settings/verification|/settings/privacy}
 
     n.item :preferences, safe_join([fa_icon('cog fw'), t('settings.preferences')]), settings_preferences_path, if: -> { current_user.functional? } do |s|

config/routes/admin.rb

@@ -201,4 +201,6 @@ namespace :admin do
       end
     end
   end
+
+  resources :software_updates, only: [:index]
 end

config/sidekiq.yml

@@ -58,3 +58,7 @@
       interval: 1 minute
       class: Scheduler::SuspendedUserCleanupScheduler
       queue: scheduler
+    software_update_check_scheduler:
+      interval: 30 minutes
+      class: Scheduler::SoftwareUpdateCheckScheduler
+      queue: scheduler