Add API endpoints to view and revoke one's quoted posts (#35578)

app/serializers/activitypub/delete_quote_authorization_serializer.rb

@@ -0,0 +1,28 @@
+# frozen_string_literal: true
+
+class ActivityPub::DeleteQuoteAuthorizationSerializer < ActivityPub::Serializer
+  attributes :id, :type, :actor, :to
+
+  # TODO: change the `object` to a `QuoteAuthorization` object instead of just the URI?
+  attribute :virtual_object, key: :object
+
+  def id
+    [object.approval_uri, '#delete'].join
+  end
+
+  def virtual_object
+    object.approval_uri
+  end
+
+  def type
+    'Delete'
+  end
+
+  def actor
+    ActivityPub::TagManager.instance.uri_for(object.quoted_account)
+  end
+
+  def to
+    [ActivityPub::TagManager::COLLECTIONS[:public]]
+  end
+end