PhabricatorMetaMTAMemberQuery.php
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	<?php

	/**
	* Expands aggregate mail recipients into their component mailables. For
	* example, a project currently expands into all of its members.
	*/
	final class PhabricatorMetaMTAMemberQuery extends PhabricatorQuery {

	private $phids = array();
	private $viewer;

	public function setViewer(PhabricatorUser $viewer) {
	$this->viewer = $viewer;
	return $this;
	}

	public function getViewer() {
	return $this->viewer;
	}

	public function withPHIDs(array $phids) {
	$this->phids = $phids;
	return $this;
	}

	public function execute() {
	$phids = array_fuse($this->phids);
	$actors = array();
	$type_map = array();
	foreach ($phids as $phid) {
	$type_map[phid_get_type($phid)][] = $phid;
	}

	// TODO: Generalize this somewhere else.

	$results = array();
	foreach ($type_map as $type => $phids) {
	switch ($type) {
	case PhabricatorProjectPHIDTypeProject::TYPECONST:
	// TODO: For now, project members are always on the "mailing list"
	// implied by the project, but we should differentiate members and
	// subscribers (i.e., allow you to unsubscribe from mail about
	// a project).

	$projects = id(new PhabricatorProjectQuery())
	->setViewer($this->getViewer())
	->needMembers(true)
	->withPHIDs($phids)
	->execute();

	$projects = mpull($projects, null, 'getPHID');
	foreach ($phids as $phid) {
	$project = idx($projects, $phid);
	if (!$project) {
	$results[$phid] = array();
	} else {
	$results[$phid] = $project->getMemberPHIDs();
	}
	}
	break;
	default:
	break;
	}
	}

	return $results;
	}

	}