DifferentialViewPolicyFieldSpecification.php
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	<?php

	final class DifferentialViewPolicyFieldSpecification
	extends DifferentialFieldSpecification {

	private $value;

	public function shouldAppearOnEdit() {
	return true;
	}

	protected function didSetRevision() {
	$this->value = $this->getRevision()->getViewPolicy();
	}

	public function setValueFromRequest(AphrontRequest $request) {
	$this->value = $request->getStr('viewPolicy');
	return $this;
	}

	public function renderEditControl() {
	$viewer = $this->getUser();
	$revision = $this->getRevision();

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

	return id(new AphrontFormPolicyControl())
	->setUser($viewer)
	->setCapability(PhabricatorPolicyCapability::CAN_VIEW)
	->setPolicyObject($revision)
	->setPolicies($policies)
	->setName('viewPolicy');
	}

	public function willWriteRevision(DifferentialRevisionEditor $editor) {
	$this->getRevision()->setViewPolicy($this->value);
	}

	}