PhabricatorApplicationTransactionValueController.php
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	<?php

	final class PhabricatorApplicationTransactionValueController
	extends PhabricatorApplicationTransactionController {

	private $value;
	private $phid;

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

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

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

	// For now, this pathway only supports policy transactions
	// to show the details of custom policies. If / when this pathway
	// supports more transaction types, rendering coding should be moved
	// into PhabricatorTransactions e.g. feed rendering code.

	// TODO: This should be some kind of "hey do you support this?" thing on
	// the transactions themselves.

	switch ($xaction->getTransactionType()) {
	case PhabricatorTransactions::TYPE_VIEW_POLICY:
	case PhabricatorTransactions::TYPE_EDIT_POLICY:
	case PhabricatorTransactions::TYPE_JOIN_POLICY:
	case PhabricatorRepositoryTransaction::TYPE_PUSH_POLICY:
	break;
	default:
	return new Aphront404Response();
	break;
	}

	if ($this->value == 'old') {
	$value = $xaction->getOldValue();
	} else {
	$value = $xaction->getNewValue();
	}
	$policy = id(new PhabricatorPolicyQuery())
	->setViewer($viewer)
	->withPHIDs(array($value))
	->executeOne();
	if (!$policy) {
	return new Aphront404Response();
	}
	if ($policy->getType() != PhabricatorPolicyType::TYPE_CUSTOM) {
	return new Aphront404Response();
	}

	$rule_objects = array();
	foreach ($policy->getCustomRuleClasses() as $class) {
	$rule_objects[$class] = newv($class, array());
	}
	$policy->attachRuleObjects($rule_objects);
	$handle_phids = $this->extractPHIDs($policy, $rule_objects);
	$handles = $this->loadHandles($handle_phids);

	$this->requireResource('policy-transaction-detail-css');
	$cancel_uri = $this->guessCancelURI($viewer, $xaction);
	$dialog = id(new AphrontDialogView())
	->setUser($viewer)
	->setTitle($policy->getFullName())
	->setWidth(AphrontDialogView::WIDTH_FORM)
	->appendChild(
	$this->renderPolicyDetails($policy, $rule_objects))
	->addCancelButton($cancel_uri, pht('Close'));

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

	private function extractPHIDs(
	PhabricatorPolicy $policy,
	array $rule_objects) {

	$phids = array();
	foreach ($policy->getRules() as $rule) {
	$rule_object = $rule_objects[$rule['rule']];
	$phids[] =
	$rule_object->getRequiredHandlePHIDsForSummary($rule['value']);
	}
	return array_filter(array_mergev($phids));
	}

	private function renderPolicyDetails(
	PhabricatorPolicy $policy,
	array $rule_objects) {
	$details = array();
	$details[] = phutil_tag(
	'p',
	array(
	'class' => 'policy-transaction-detail-intro',
	),
	pht('These rules are processed in order:'));

	foreach ($policy->getRules() as $index => $rule) {
	$rule_object = $rule_objects[$rule['rule']];
	if ($rule['action'] == 'allow') {
	$icon = 'fa-check-circle green';
	} else {
	$icon = 'fa-minus-circle red';
	}
	$icon = id(new PHUIIconView())
	->setIconFont($icon)
	->setText(
	ucfirst($rule['action']).' '.$rule_object->getRuleDescription());
	$handle_phids =
	$rule_object->getRequiredHandlePHIDsForSummary($rule['value']);
	if ($handle_phids) {
	$value = $this->renderHandlesForPHIDs($handle_phids, ',');
	} else {
	$value = $rule['value'];
	}
	$details[] = phutil_tag('div',
	array(
	'class' => 'policy-transaction-detail-row',
	),
	array(
	$icon,
	$value,
	));
	}

	$details[] = phutil_tag(
	'p',
	array(
	'class' => 'policy-transaction-detail-end',
	),
	pht(
	'If no rules match, %s all other users.',
	phutil_tag('b',
	array(),
	$policy->getDefaultAction())));
	return $details;
	}

	}

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