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;
	}

	}