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

app/services/revoke_quote_service.rb

@@ -0,0 +1,32 @@
+# frozen_string_literal: true
+
+class RevokeQuoteService < BaseService
+  include Payloadable
+
+  def call(quote)
+    @quote = quote
+    @account = quote.quoted_account
+
+    @quote.reject!
+    distribute_stamp_deletion!
+  end
+
+  private
+
+  def distribute_stamp_deletion!
+    ActivityPub::DeliveryWorker.push_bulk(inboxes, limit: 1_000) do |inbox_url|
+      [signed_activity_json, @account.id, inbox_url]
+    end
+  end
+
+  def inboxes
+    [
+      @quote.status,
+      @quote.quoted_status,
+    ].compact.map { |status| StatusReachFinder.new(status, unsafe: true).inboxes }.flatten.uniq
+  end
+
+  def signed_activity_json
+    @signed_activity_json ||= Oj.dump(serialize_payload(@quote, ActivityPub::DeleteQuoteAuthorizationSerializer, signer: @account, always_sign: true))
+  end
+end