DifferentialViewPolicyField.php
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	<?php

	final class DifferentialViewPolicyField
	extends DifferentialCoreCustomField {

	public function getFieldKey() {
	return 'differential:view-policy';
	}

	public function getFieldName() {
	return pht('View Policy');
	}

	public function getFieldDescription() {
	return pht('Controls visibility.');
	}

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

	protected function writeValueToRevision(
	DifferentialRevision $revision,
	$value) {
	$revision->setViewPolicy($value);
	}

	public function readValueFromRequest(AphrontRequest $request) {
	$this->setValue($request->getStr($this->getFieldKey()));
	}

	public function renderEditControl(array $handles) {
	$viewer = $this->getViewer();
	$revision = $this->getObject();

	$policies = id(new PhabricatorPolicyQuery())
	->setViewer($viewer)
	->setObject($revision)
	->execute();

	return id(new AphrontFormPolicyControl())
	->setUser($viewer)
	->setCapability(PhabricatorPolicyCapability::CAN_VIEW)
	->setPolicyObject($revision)
	->setPolicies($policies)
	->setName($this->getFieldKey())
	->setValue($this->getValue())
	->setError($this->getFieldError());
	}

	public function getApplicationTransactionType() {
	return PhabricatorTransactions::TYPE_VIEW_POLICY;
	}

	}