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PhabricatorPhurlURLLongURLTransaction.php
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			<?php

			final class PhabricatorPhurlURLLongURLTransaction
			extends PhabricatorPhurlURLTransactionType {

			const TRANSACTIONTYPE = 'phurl.longurl';

			public function generateOldValue($object) {
			return $object->getLongURL();
			}

			public function applyInternalEffects($object, $value) {
			$object->setLongURL($value);
			}

			public function getTitle() {
			return pht(
			'%s changed the destination URL from %s to %s.',
			$this->renderAuthor(),
			$this->renderOldValue(),
			$this->renderNewValue());
			}

			public function getTitleForFeed() {
			return pht(
			'%s changed the destination URL %s from %s to %s.',
			$this->renderAuthor(),
			$this->renderObject(),
			$this->renderOldValue(),
			$this->renderNewValue());
			}

			public function validateTransactions($object, array $xactions) {
			$errors = array();

			if ($this->isEmptyTextTransaction($object->getLongURL(), $xactions)) {
			$errors[] = $this->newRequiredError(
			pht('URL path is required'));
			}

			foreach ($xactions as $xaction) {
			if ($xaction->getOldValue() != $xaction->getNewValue()) {
			$protocols = PhabricatorEnv::getEnvConfig('uri.allowed-protocols');
			$uri = new PhutilURI($xaction->getNewValue());
			if (!isset($protocols[$uri->getProtocol()])) {
			$errors[] = $this->newRequiredError(
			pht('The protocol of the URL is invalid.'));
			}
			}
			}

			return $errors;
			}

			public function getIcon() {
			return 'fa-external-link-square';
			}

			}