PhabricatorPackagesPackagePublisherTransaction.php
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	<?php

	final class PhabricatorPackagesPackagePublisherTransaction
	extends PhabricatorPackagesPackageTransactionType {

	const TRANSACTIONTYPE = 'packages.package.publisher';

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

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

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

	$current_value = $object->getPublisherPHID();
	if ($this->isEmptyTextTransaction($current_value, $xactions)) {
	$errors[] = $this->newRequiredError(
	pht(
	'You must select a publisher when creating a package.'));
	return $errors;
	}

	if (!$this->isNewObject()) {
	foreach ($xactions as $xaction) {
	$errors[] = $this->newInvalidError(
	pht('Once a package is created, its publisher can not be changed.'),
	$xaction);
	}
	}

	$viewer = $this->getActor();
	foreach ($xactions as $xaction) {
	$publisher_phid = $xaction->getNewValue();

	$publisher = id(new PhabricatorPackagesPublisherQuery())
	->setViewer($viewer)
	->withPHIDs(array($publisher_phid))
	->setRaisePolicyExceptions(false)
	->requireCapabilities(
	array(
	PhabricatorPolicyCapability::CAN_VIEW,
	PhabricatorPolicyCapability::CAN_EDIT,
	))
	->executeOne();

	if (!$publisher) {
	$errors[] = $this->newInvalidError(
	pht(
	'Publisher "%s" is invalid: the publisher must exist and you '.
	'must have permission to edit it in order to create a new '.
	'package.',
	$publisher_phid),
	$xaction);
	continue;
	}

	$object->attachPublisher($publisher);
	}

	return $errors;
	}

	}