PhabricatorApplicationTransactionController.php
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	<?php

	abstract class PhabricatorApplicationTransactionController
	extends PhabricatorController {

	protected function guessCancelURI(
	PhabricatorUser $viewer,
	PhabricatorApplicationTransaction $xaction) {

	// Take an educated guess at the URI where the transactions appear so we
	// can send the cancel button somewhere sensible. This won't always get the
	// best answer (for example, Diffusion's history is visible on a page other
	// than the main object view page) but should always get a reasonable one.

	$cancel_uri = '/';
	$handle = id(new PhabricatorHandleQuery())
	->setViewer($viewer)
	->withPHIDs(array($xaction->getObjectPHID()))
	->executeOne();
	if ($handle) {
	$cancel_uri = $handle->getURI();
	}

	return $cancel_uri;
	}

	}