Add announcements (#12662)

* Add announcements

Fix #11006

* Add reactions to announcements

* Add admin UI for announcements

* Add unit tests

* Fix issues

- Add `with_dismissed` param to announcements API
- Fix end date not being formatted when time range is given
- Fix announcement delete causing reactions to send streaming updates
- Fix announcements container growing too wide and mascot too small
- Fix `all_day` being settable when no time range is given
- Change text "Update" to "Announcement"

* Fix scheduler unpublishing announcements before they are due

* Fix filter params not being passed to announcements filter

1 files changed, 33 insertions, 0 deletions

diff --git a/app/controllers/api/v1/announcements_controller.rb b/app/controllers/api/v1/announcements_controller.rb
new file mode 100644
index 000000000..6724fac2e
--- /dev/null
+++ b/app/controllers/api/v1/announcements_controller.rb
@@ -0,0 +1,33 @@
+# frozen_string_literal: true
+
+class Api::V1::AnnouncementsController < Api::BaseController
+  before_action -> { doorkeeper_authorize! :write, :'write:accounts' }, only: :dismiss
+  before_action :require_user!
+  before_action :set_announcements, only: :index
+  before_action :set_announcement, except: :index
+
+  def index
+    render json: @announcements, each_serializer: REST::AnnouncementSerializer
+  end
+
+  def dismiss
+    AnnouncementMute.create!(account: current_account, announcement: @announcement)
+    render_empty
+  end
+
+  private
+
+  def set_announcements
+    @announcements = begin
+      scope = Announcement.published
+
+      scope.merge!(Announcement.without_muted(current_account)) unless truthy_param?(:with_dismissed)
+
+      scope.chronological
+    end
+  end
+
+  def set_announcement
+    @announcement = Announcement.published.find(params[:id])
+  end
+end