PhabricatorPolicyExplainController.php
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	<?php

	final class PhabricatorPolicyExplainController
	extends PhabricatorPolicyController {

	private $phid;
	private $capability;

	public function shouldAllowPublic() {
	return true;
	}

	public function willProcessRequest(array $data) {
	$this->phid = $data['phid'];
	$this->capability = $data['capability'];
	}

	public function processRequest() {
	$request = $this->getRequest();
	$viewer = $request->getUser();

	$phid = $this->phid;
	$capability = $this->capability;

	$object = id(new PhabricatorObjectQuery())
	->setViewer($viewer)
	->withPHIDs(array($phid))
	->executeOne();
	if (!$object) {
	return new Aphront404Response();
	}

	$policies = PhabricatorPolicyQuery::loadPolicies(
	$viewer,
	$object);

	$policy = idx($policies, $capability);
	if (!$policy) {
	return new Aphront404Response();
	}

	$handle = id(new PhabricatorHandleQuery())
	->setViewer($viewer)
	->withPHIDs(array($phid))
	->executeOne();
	$object_uri = $handle->getURI();

	$explanation = $policy->getExplanation($capability);
	$auto_info = (array)$object->describeAutomaticCapability($capability);

	foreach ($auto_info as $key => $info) {
	$auto_info[$key] = phutil_tag('li', array(), $info);
	}
	if ($auto_info) {
	$auto_info = phutil_tag('ul', array(), $auto_info);
	}

	$content = array(
	$explanation,
	$auto_info,
	);

	$dialog = id(new AphrontDialogView())
	->setUser($viewer)
	->setClass('aphront-access-dialog')
	->setTitle(pht('Policy Details'))
	->appendChild($content)
	->addCancelButton($object_uri, pht('Done'));

	return id(new AphrontDialogResponse())->setDialog($dialog);
	}

	}