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AlmanacBindingServiceTransaction.php
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			<?php

			final class AlmanacBindingServiceTransaction
			extends AlmanacBindingTransactionType {

			const TRANSACTIONTYPE = 'almanac:binding:service';

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

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

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

			$service_phid = $object->getServicePHID();
			if ($this->isEmptyTextTransaction($service_phid, $xactions)) {
			$errors[] = $this->newRequiredError(
			pht('Bindings must have a service.'));
			}

			foreach ($xactions as $xaction) {
			if (!$this->isNewObject()) {
			$errors[] = $this->newInvalidError(
			pht(
			'The service for a binding can not be changed once it has '.
			'been created.'),
			$xaction);
			continue;
			}

			$service_phid = $xaction->getNewValue();
			$services = id(new AlmanacServiceQuery())
			->setViewer($this->getActor())
			->withPHIDs(array($service_phid))
			->execute();
			if (!$services) {
			$errors[] = $this->newInvalidError(
			pht('You can not bind a nonexistent or restricted service.'),
			$xaction);
			continue;
			}

			$service = head($services);
			$can_edit = PhabricatorPolicyFilter::hasCapability(
			$this->getActor(),
			$service,
			PhabricatorPolicyCapability::CAN_EDIT);
			if (!$can_edit) {
			$errors[] = $this->newInvalidError(
			pht(
			'You can not bind a service which you do not have permission '.
			'to edit.'));
			continue;
			}
			}

			return $errors;
			}

			}