Federate pinned statuses over ActivityPub (#6610)

* Federate pinned statuses over ActivityPub

* Display pinned toots in web UI

Fix #6117

* Fix migration

* Fix tests

* Update outbox_serializer.rb

* Update remove_serializer.rb

* Update add_serializer.rb

* Update fetch_featured_collection_service.rb

2 files changed, 27 insertions, 0 deletions

diff --git a/app/lib/activitypub/activity/add.rb b/app/lib/activitypub/activity/add.rb
new file mode 100644
index 000000000..ea94d2f98
--- /dev/null
+++ b/app/lib/activitypub/activity/add.rb
@@ -0,0 +1,13 @@
+# frozen_string_literal: true
+
+class ActivityPub::Activity::Add < ActivityPub::Activity
+  def perform
+    return unless @json['target'].present? && value_or_id(@json['target']) == @account.featured_collection_url
+
+    status = status_from_uri(object_uri)
+
+    return unless status.account_id == @account.id && !@account.pinned?(status)
+
+    StatusPin.create!(account: @account, status: status)
+  end
+end
diff --git a/app/lib/activitypub/activity/remove.rb b/app/lib/activitypub/activity/remove.rb
new file mode 100644
index 000000000..97cee5116
--- /dev/null
+++ b/app/lib/activitypub/activity/remove.rb
@@ -0,0 +1,14 @@
+# frozen_string_literal: true
+
+class ActivityPub::Activity::Remove < ActivityPub::Activity
+  def perform
+    return unless @json['origin'].present? && value_or_id(@json['origin']) == @account.featured_collection_url
+
+    status = status_from_uri(object_uri)
+
+    return unless status.account_id == @account.id
+
+    pin = StatusPin.find_by(account: @account, status: status)
+    pin&.destroy!
+  end
+end