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PhabricatorAuthFactorProviderDuoHostnameTransaction.php
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			<?php

			final class PhabricatorAuthFactorProviderDuoHostnameTransaction
			extends PhabricatorAuthFactorProviderTransactionType {

			const TRANSACTIONTYPE = 'duo.hostname';

			public function generateOldValue($object) {
			$key = PhabricatorDuoAuthFactor::PROP_HOSTNAME;
			return $object->getAuthFactorProviderProperty($key);
			}

			public function applyInternalEffects($object, $value) {
			$key = PhabricatorDuoAuthFactor::PROP_HOSTNAME;
			$object->setAuthFactorProviderProperty($key, $value);
			}

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

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

			if (!$this->isDuoProvider($object)) {
			return $errors;
			}

			$old_value = $this->generateOldValue($object);
			if ($this->isEmptyTextTransaction($old_value, $xactions)) {
			$errors[] = $this->newRequiredError(
			pht('Duo providers must have an API hostname.'));
			}

			foreach ($xactions as $xaction) {
			$new_value = $xaction->getNewValue();

			if (!strlen($new_value)) {
			continue;
			}

			if ($new_value === $old_value) {
			continue;
			}

			try {
			PhabricatorDuoAuthFactor::requireDuoAPIHostname($new_value);
			} catch (Exception $ex) {
			$errors[] = $this->newInvalidError(
			$ex->getMessage(),
			$xaction);
			continue;
			}
			}

			return $errors;
			}

			}