DifferentialReviewersField.php
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	<?php

	final class DifferentialReviewersField
	extends DifferentialCoreCustomField {

	public function getFieldKey() {
	return 'differential:reviewers';
	}

	public function getFieldName() {
	return pht('Reviewers');
	}

	public function getFieldDescription() {
	return pht('Manage reviewers.');
	}

	protected function readValueFromRevision(
	DifferentialRevision $revision) {
	return $revision->getReviewers();
	}

	public function shouldAppearInPropertyView() {
	return true;
	}

	public function renderPropertyViewLabel() {
	return $this->getFieldName();
	}

	public function getRequiredHandlePHIDsForPropertyView() {
	return mpull($this->getUserReviewers(), 'getReviewerPHID');
	}

	public function renderPropertyViewValue(array $handles) {
	$reviewers = $this->getUserReviewers();
	if (!$reviewers) {
	return phutil_tag('em', array(), pht('None'));
	}

	$view = id(new DifferentialReviewersView())
	->setUser($this->getViewer())
	->setReviewers($reviewers)
	->setHandles($handles);

	$diff = $this->getActiveDiff();
	if ($diff) {
	$view->setActiveDiff($diff);
	}

	return $view;
	}

	private function getUserReviewers() {
	$reviewers = array();
	foreach ($this->getObject()->getReviewers() as $reviewer) {
	if ($reviewer->isUser()) {
	$reviewers[] = $reviewer;
	}
	}
	return $reviewers;
	}

	public function getRequiredHandlePHIDsForRevisionHeaderWarnings() {
	return mpull($this->getValue(), 'getReviewerPHID');
	}

	public function getWarningsForRevisionHeader(array $handles) {
	$revision = $this->getObject();

	if (!$revision->isNeedsReview()) {
	return array();
	}

	$viewer = $this->getViewer();

	PhabricatorPolicyFilterSet::loadHandleViewCapabilities(
	$viewer,
	$handles,
	array($revision));

	$all_resigned = true;
	$all_disabled = true;
	$any_reviewers = false;
	$all_exiled = true;

	foreach ($this->getValue() as $reviewer) {
	$reviewer_phid = $reviewer->getReviewerPHID();
	$handle = $handles[$reviewer_phid];

	$any_reviewers = true;

	if (!$handle->isDisabled()) {
	$all_disabled = false;
	}

	if (!$reviewer->isResigned()) {
	$all_resigned = false;
	}

	if (!$handle->hasCapabilities()) {
	$all_exiled = false;
	} else {
	if ($handle->hasViewCapability($revision)) {
	$all_exiled = false;
	}
	}

	}

	$warnings = array();
	if (!$any_reviewers) {
	$warnings[] = pht(
	'This revision needs review, but there are no reviewers specified.');
	} else if ($all_disabled) {
	$warnings[] = pht(
	'This revision needs review, but all specified reviewers are '.
	'disabled or inactive.');
	} else if ($all_resigned) {
	$warnings[] = pht(
	'This revision needs review, but all reviewers have resigned.');
	} else if ($all_exiled) {
	$warnings[] = pht(
	'This revision needs review, but no reviewers have permission '.
	'to view it.');
	}

	return $warnings;
	}

	}

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