PhabricatorSubscriptionsMailEngineExtension.php
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	<?php

	final class PhabricatorSubscriptionsMailEngineExtension
	extends PhabricatorMailEngineExtension {

	const EXTENSIONKEY = 'subscriptions';

	public function supportsObject($object) {
	return ($object instanceof PhabricatorSubscribableInterface);
	}

	public function newMailStampTemplates($object) {
	return array(
	id(new PhabricatorPHIDMailStamp())
	->setKey('subscriber')
	->setLabel(pht('Subscriber')),
	);
	}

	public function newMailStamps($object, array $xactions) {
	$editor = $this->getEditor();
	$viewer = $this->getViewer();

	$subscriber_phids = PhabricatorEdgeQuery::loadDestinationPHIDs(
	$object->getPHID(),
	PhabricatorObjectHasSubscriberEdgeType::EDGECONST);

	$this->getMailStamp('subscriber')
	->setValue($subscriber_phids);
	}

	}