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HeraldWebhookURITransaction.php
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			<?php

			final class HeraldWebhookURITransaction
			extends HeraldWebhookTransactionType {

			const TRANSACTIONTYPE = 'uri';

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

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

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

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

			public function validateTransactions($object, array $xactions) {
			$errors = array();
			$viewer = $this->getActor();

			if ($this->isEmptyTextTransaction($object->getName(), $xactions)) {
			$errors[] = $this->newRequiredError(
			pht('Webhooks must have a URI.'));
			return $errors;
			}

			$max_length = $object->getColumnMaximumByteLength('webhookURI');
			foreach ($xactions as $xaction) {
			$old_value = $this->generateOldValue($object);
			$new_value = $xaction->getNewValue();

			$new_length = strlen($new_value);
			if ($new_length > $max_length) {
			$errors[] = $this->newInvalidError(
			pht(
			'Webhook URIs can be no longer than %s characters.',
			new PhutilNumber($max_length)),
			$xaction);
			}

			try {
			PhabricatorEnv::requireValidRemoteURIForFetch(
			$new_value,
			array(
			'http',
			'https',
			));
			} catch (Exception $ex) {
			$errors[] = $this->newInvalidError(
			$ex->getMessage(),
			$xaction);
			}
			}

			return $errors;
			}

			}