nextcloud/apps/dav/lib/DAV/GroupPrincipalBackend.php

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<?php
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/**
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* @copyright Copyright (c) 2016, ownCloud, Inc.
* @copyright Copyright (c) 2018, Georg Ehrke
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*
* @author Christoph Wurst <christoph@winzerhof-wurst.at>
* @author Georg Ehrke <oc.list@georgehrke.com>
* @author John Molakvoæ (skjnldsv) <skjnldsv@protonmail.com>
* @author Roeland Jago Douma <roeland@famdouma.nl>
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* @author Thomas Müller <thomas.mueller@tmit.eu>
*
* @license AGPL-3.0
*
* This code is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License, version 3,
* along with this program. If not, see <http://www.gnu.org/licenses/>
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*
*/
namespace OCA\DAV\DAV;
use OCP\IGroup;
use OCP\IGroupManager;
use OCP\IUser;
use OCP\IUserSession;
use OCP\Share\IManager as IShareManager;
use Sabre\DAV\Exception;
use Sabre\DAV\PropPatch;
use Sabre\DAVACL\PrincipalBackend\BackendInterface;
class GroupPrincipalBackend implements BackendInterface {
public const PRINCIPAL_PREFIX = 'principals/groups';
/** @var IGroupManager */
private $groupManager;
/** @var IUserSession */
private $userSession;
/** @var IShareManager */
private $shareManager;
/**
* @param IGroupManager $IGroupManager
* @param IUserSession $userSession
* @param IShareManager $shareManager
*/
public function __construct(IGroupManager $IGroupManager,
IUserSession $userSession,
IShareManager $shareManager) {
$this->groupManager = $IGroupManager;
$this->userSession = $userSession;
$this->shareManager = $shareManager;
}
/**
* Returns a list of principals based on a prefix.
*
* This prefix will often contain something like 'principals'. You are only
* expected to return principals that are in this base path.
*
* You are expected to return at least a 'uri' for every user, you can
* return any additional properties if you wish so. Common properties are:
* {DAV:}displayname
*
* @param string $prefixPath
* @return string[]
*/
public function getPrincipalsByPrefix($prefixPath) {
$principals = [];
if ($prefixPath === self::PRINCIPAL_PREFIX) {
foreach ($this->groupManager->search('') as $user) {
$principals[] = $this->groupToPrincipal($user);
}
}
return $principals;
}
/**
* Returns a specific principal, specified by it's path.
* The returned structure should be the exact same as from
* getPrincipalsByPrefix.
*
* @param string $path
* @return array
*/
public function getPrincipalByPath($path) {
$elements = explode('/', $path, 3);
if ($elements[0] !== 'principals') {
return null;
}
if ($elements[1] !== 'groups') {
return null;
}
$name = urldecode($elements[2]);
$group = $this->groupManager->get($name);
if (!is_null($group)) {
return $this->groupToPrincipal($group);
}
return null;
}
/**
* Returns the list of members for a group-principal
*
* @param string $principal
* @return string[]
* @throws Exception
*/
public function getGroupMemberSet($principal) {
$elements = explode('/', $principal);
if ($elements[0] !== 'principals') {
return [];
}
if ($elements[1] !== 'groups') {
return [];
}
$name = $elements[2];
$group = $this->groupManager->get($name);
if (is_null($group)) {
return [];
}
return array_map(function ($user) {
return $this->userToPrincipal($user);
}, $group->getUsers());
}
/**
* Returns the list of groups a principal is a member of
*
* @param string $principal
* @return array
* @throws Exception
*/
public function getGroupMembership($principal) {
return [];
}
/**
* Updates the list of group members for a group principal.
*
* The principals should be passed as a list of uri's.
*
* @param string $principal
* @param string[] $members
* @throws Exception
*/
public function setGroupMemberSet($principal, array $members) {
throw new Exception('Setting members of the group is not supported yet');
}
/**
* @param string $path
* @param PropPatch $propPatch
* @return int
*/
public function updatePrincipal($path, PropPatch $propPatch) {
return 0;
}
/**
* @param string $prefixPath
* @param array $searchProperties
* @param string $test
* @return array
*/
public function searchPrincipals($prefixPath, array $searchProperties, $test = 'allof') {
$results = [];
if (\count($searchProperties) === 0) {
return [];
}
if ($prefixPath !== self::PRINCIPAL_PREFIX) {
return [];
}
// If sharing is disabled, return the empty array
$shareAPIEnabled = $this->shareManager->shareApiEnabled();
if (!$shareAPIEnabled) {
return [];
}
// If sharing is restricted to group members only,
// return only members that have groups in common
$restrictGroups = false;
if ($this->shareManager->shareWithGroupMembersOnly()) {
$user = $this->userSession->getUser();
if (!$user) {
return [];
}
$restrictGroups = $this->groupManager->getUserGroupIds($user);
}
foreach ($searchProperties as $prop => $value) {
switch ($prop) {
case '{DAV:}displayname':
$groups = $this->groupManager->search($value);
$results[] = array_reduce($groups, function (array $carry, IGroup $group) use ($restrictGroups) {
$gid = $group->getGID();
// is sharing restricted to groups only?
if ($restrictGroups !== false) {
if (!\in_array($gid, $restrictGroups, true)) {
return $carry;
}
}
$carry[] = self::PRINCIPAL_PREFIX . '/' . urlencode($gid);
return $carry;
}, []);
break;
case '{urn:ietf:params:xml:ns:caldav}calendar-user-address-set':
// If you add support for more search properties that qualify as a user-address,
// please also add them to the array below
$results[] = $this->searchPrincipals(self::PRINCIPAL_PREFIX, [
], 'anyof');
break;
default:
$results[] = [];
break;
}
}
// results is an array of arrays, so this is not the first search result
// but the results of the first searchProperty
if (count($results) === 1) {
return $results[0];
}
switch ($test) {
case 'anyof':
return array_values(array_unique(array_merge(...$results)));
case 'allof':
default:
return array_values(array_intersect(...$results));
}
}
/**
* @param string $uri
* @param string $principalPrefix
* @return string
*/
public function findByUri($uri, $principalPrefix) {
// If sharing is disabled, return the empty array
$shareAPIEnabled = $this->shareManager->shareApiEnabled();
if (!$shareAPIEnabled) {
return null;
}
// If sharing is restricted to group members only,
// return only members that have groups in common
$restrictGroups = false;
if ($this->shareManager->shareWithGroupMembersOnly()) {
$user = $this->userSession->getUser();
if (!$user) {
return null;
}
$restrictGroups = $this->groupManager->getUserGroupIds($user);
}
if (strpos($uri, 'principal:principals/groups/') === 0) {
$name = urlencode(substr($uri, 28));
if ($restrictGroups !== false && !\in_array($name, $restrictGroups, true)) {
return null;
}
return substr($uri, 10);
}
return null;
}
/**
* @param IGroup $group
* @return array
*/
protected function groupToPrincipal($group) {
$groupId = $group->getGID();
// getDisplayName returns UID if none
$displayName = $group->getDisplayName();
return [
'uri' => 'principals/groups/' . urlencode($groupId),
'{DAV:}displayname' => $displayName,
'{urn:ietf:params:xml:ns:caldav}calendar-user-type' => 'GROUP',
];
}
/**
* @param IUser $user
* @return array
*/
protected function userToPrincipal($user) {
$userId = $user->getUID();
// getDisplayName returns UID if none
$displayName = $user->getDisplayName();
$principal = [
'uri' => 'principals/users/' . $userId,
'{DAV:}displayname' => $displayName,
'{urn:ietf:params:xml:ns:caldav}calendar-user-type' => 'INDIVIDUAL',
];
$email = $user->getEMailAddress();
if (!empty($email)) {
$principal['{http://sabredav.org/ns}email-address'] = $email;
}
return $principal;
}
}