DifferentialRevisionAuthorTransaction.php
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	<?php

	final class DifferentialRevisionAuthorTransaction
	extends DifferentialRevisionTransactionType {

	const TRANSACTIONTYPE = 'differential.revision.author';
	const EDITKEY = 'author';

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

	public function generateNewValue($object, $value) {
	return $value;
	}

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

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

	if (!$xactions) {
	return $errors;
	}

	foreach ($xactions as $xaction) {
	$old = $xaction->generateOldValue($object);
	$new = $xaction->getNewValue();

	if ($old === $new) {
	continue;
	}

	if (!$new) {
	$errors[] = $this->newInvalidError(
	pht('Revisions must have an assigned author.'),
	$xaction);
	continue;
	}

	$author_objects = id(new PhabricatorPeopleQuery())
	->setViewer($actor)
	->withPHIDs(array($new))
	->execute();
	if (!$author_objects) {
	$errors[] = $this->newInvalidError(
	pht('Author "%s" is not a valid user.', $new),
	$xaction);
	continue;
	}
	}

	return $errors;
	}

	public function getIcon() {
	$author_phid = $this->getAuthorPHID();
	$old_phid = $this->getOldValue();
	$new_phid = $this->getNewValue();

	$is_commandeer = ($author_phid === $new_phid);
	$is_foist = ($author_phid === $old_phid);

	if ($is_commandeer) {
	return 'fa-flag';
	}

	if ($is_foist) {
	return 'fa-gift';
	}

	return 'fa-user';
	}

	public function getColor() {
	return 'sky';
	}

	public function getTitle() {
	$author_phid = $this->getAuthorPHID();
	$old_phid = $this->getOldValue();
	$new_phid = $this->getNewValue();

	$is_commandeer = ($author_phid === $new_phid);
	$is_foist = ($author_phid === $old_phid);

	if ($is_commandeer) {
	return pht(
	'%s commandeered this revision from %s.',
	$this->renderAuthor(),
	$this->renderOldHandle());
	}

	if ($is_foist) {
	if ($new_phid) {
	return pht(
	'%s foisted this revision upon %s.',
	$this->renderAuthor(),
	$this->renderNewHandle());
	} else {

	// This isn't a valid transaction that can be applied, but happens in
	// the preview if you temporarily delete the tokenizer value.

	return pht(
	'%s foisted this revision upon...',
	$this->renderAuthor());
	}
	}

	return pht(
	'%s changed the author of this revision from %s to %s.',
	$this->renderAuthor(),
	$this->renderOldHandle(),
	$this->renderNewHandle());
	}

	public function getTitleForFeed() {
	$author_phid = $this->getAuthorPHID();
	$old_phid = $this->getOldValue();
	$new_phid = $this->getNewValue();

	$is_commandeer = ($author_phid === $new_phid);
	$is_foist = ($author_phid === $old_phid);

	if ($is_commandeer) {
	return pht(
	'%s commandeered %s from %s.',
	$this->renderAuthor(),
	$this->renderObject(),
	$this->renderOldHandle());
	}

	if ($is_foist) {
	return pht(
	'%s foisted %s upon %s.',
	$this->renderAuthor(),
	$this->renderObject(),
	$this->renderNewHandle());
	}

	return pht(
	'%s changed the author of %s from %s to %s.',
	$this->renderAuthor(),
	$this->renderObject(),
	$this->renderOldHandle(),
	$this->renderNewHandle());

	}

	public function getTransactionTypeForConduit($xaction) {
	return 'author';
	}

	public function getFieldValuesForConduit($object, $data) {
	return array(
	'old' => $object->getOldValue(),
	'new' => $object->getNewValue(),
	);
	}

	}

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