Add initial support for ingesting and verifying remote quote posts (#34370)

app/serializers/rest/base_quote_serializer.rb

@@ -0,0 +1,25 @@
+# frozen_string_literal: true
+
+class REST::BaseQuoteSerializer < ActiveModel::Serializer
+  attributes :state
+
+  def state
+    return object.state unless object.accepted?
+
+    # Extra states when a status is unavailable
+    return 'deleted' if object.quoted_status.nil?
+    return 'unauthorized' if status_filter.filtered?
+
+    object.state
+  end
+
+  def quoted_status
+    object.quoted_status if object.accepted? && object.quoted_status.present? && !status_filter.filtered?
+  end
+
+  private
+
+  def status_filter
+    @status_filter ||= StatusFilter.new(object.quoted_status, current_user&.account, instance_options[:relationships] || {})
+  end
+end