nextcloud/apps/dav/lib/CalDAV/ResourceBooking/AbstractPrincipalBackend.php

475 lines
14 KiB
PHP

<?php
/**
* @copyright 2019, Georg Ehrke <oc.list@georgehrke.com>
*
* @author Georg Ehrke <oc.list@georgehrke.com>
* @author Roeland Jago Douma <roeland@famdouma.nl>
*
* @license GNU AGPL version 3 or any later version
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* 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
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
namespace OCA\DAV\CalDAV\ResourceBooking;
use OCA\DAV\CalDAV\Proxy\ProxyMapper;
use OCA\DAV\Traits\PrincipalProxyTrait;
use OCP\IDBConnection;
use OCP\IGroupManager;
use OCP\ILogger;
use OCP\IUserSession;
use Sabre\DAV\Exception;
use Sabre\DAV\PropPatch;
use Sabre\DAVACL\PrincipalBackend\BackendInterface;
abstract class AbstractPrincipalBackend implements BackendInterface {
/** @var IDBConnection */
private $db;
/** @var IUserSession */
private $userSession;
/** @var IGroupManager */
private $groupManager;
/** @var ILogger */
private $logger;
/** @var ProxyMapper */
private $proxyMapper;
/** @var string */
private $principalPrefix;
/** @var string */
private $dbTableName;
/** @var string */
private $dbMetaDataTableName;
/** @var string */
private $dbForeignKeyName;
/** @var string */
private $cuType;
/**
* @param IDBConnection $dbConnection
* @param IUserSession $userSession
* @param IGroupManager $groupManager
* @param ILogger $logger
* @param string $principalPrefix
* @param string $dbPrefix
* @param string $cuType
*/
public function __construct(IDBConnection $dbConnection,
IUserSession $userSession,
IGroupManager $groupManager,
ILogger $logger,
ProxyMapper $proxyMapper,
string $principalPrefix,
string $dbPrefix,
string $cuType) {
$this->db = $dbConnection;
$this->userSession = $userSession;
$this->groupManager = $groupManager;
$this->logger = $logger;
$this->proxyMapper = $proxyMapper;
$this->principalPrefix = $principalPrefix;
$this->dbTableName = 'calendar_' . $dbPrefix . 's';
$this->dbMetaDataTableName = $this->dbTableName . '_md';
$this->dbForeignKeyName = $dbPrefix . '_id';
$this->cuType = $cuType;
}
use PrincipalProxyTrait;
/**
* 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 === $this->principalPrefix) {
$query = $this->db->getQueryBuilder();
$query->select(['id', 'backend_id', 'resource_id', 'email', 'displayname'])
->from($this->dbTableName);
$stmt = $query->execute();
$metaDataQuery = $this->db->getQueryBuilder();
$metaDataQuery->select([$this->dbForeignKeyName, 'key', 'value'])
->from($this->dbMetaDataTableName);
$metaDataStmt = $metaDataQuery->execute();
$metaDataRows = $metaDataStmt->fetchAll(\PDO::FETCH_ASSOC);
$metaDataById = [];
foreach($metaDataRows as $metaDataRow) {
if (!isset($metaDataById[$metaDataRow[$this->dbForeignKeyName]])) {
$metaDataById[$metaDataRow[$this->dbForeignKeyName]] = [];
}
$metaDataById[$metaDataRow[$this->dbForeignKeyName]][$metaDataRow['key']] =
$metaDataRow['value'];
}
while($row = $stmt->fetch(\PDO::FETCH_ASSOC)) {
$id = $row['id'];
if (isset($metaDataById[$id])) {
$principals[] = $this->rowToPrincipal($row, $metaDataById[$id]);
} else {
$principals[] = $this->rowToPrincipal($row);
}
}
$stmt->closeCursor();
}
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) {
if (strpos($path, $this->principalPrefix) !== 0) {
return null;
}
list(, $name) = \Sabre\Uri\split($path);
list($backendId, $resourceId) = explode('-', $name, 2);
$query = $this->db->getQueryBuilder();
$query->select(['id', 'backend_id', 'resource_id', 'email', 'displayname'])
->from($this->dbTableName)
->where($query->expr()->eq('backend_id', $query->createNamedParameter($backendId)))
->andWhere($query->expr()->eq('resource_id', $query->createNamedParameter($resourceId)));
$stmt = $query->execute();
$row = $stmt->fetch(\PDO::FETCH_ASSOC);
if(!$row) {
return null;
}
$metaDataQuery = $this->db->getQueryBuilder();
$metaDataQuery->select(['key', 'value'])
->from($this->dbMetaDataTableName)
->where($metaDataQuery->expr()->eq($this->dbForeignKeyName, $metaDataQuery->createNamedParameter($row['id'])));
$metaDataStmt = $metaDataQuery->execute();
$metaDataRows = $metaDataStmt->fetchAll(\PDO::FETCH_ASSOC);
$metadata = [];
foreach($metaDataRows as $metaDataRow) {
$metadata[$metaDataRow['key']] = $metaDataRow['value'];
}
return $this->rowToPrincipal($row, $metadata);
}
/**
* @param int $id
* @return array|null
*/
public function getPrincipalById($id):?array {
$query = $this->db->getQueryBuilder();
$query->select(['id', 'backend_id', 'resource_id', 'email', 'displayname'])
->from($this->dbTableName)
->where($query->expr()->eq('id', $query->createNamedParameter($id)));
$stmt = $query->execute();
$row = $stmt->fetch(\PDO::FETCH_ASSOC);
if(!$row) {
return null;
}
$metaDataQuery = $this->db->getQueryBuilder();
$metaDataQuery->select(['key', 'value'])
->from($this->dbMetaDataTableName)
->where($metaDataQuery->expr()->eq($this->dbForeignKeyName, $metaDataQuery->createNamedParameter($row['id'])));
$metaDataStmt = $metaDataQuery->execute();
$metaDataRows = $metaDataStmt->fetchAll(\PDO::FETCH_ASSOC);
$metadata = [];
foreach($metaDataRows as $metaDataRow) {
$metadata[$metaDataRow['key']] = $metaDataRow['value'];
}
return $this->rowToPrincipal($row, $metadata);
}
/**
* @param string $path
* @param PropPatch $propPatch
* @return int
*/
function updatePrincipal($path, PropPatch $propPatch) {
return 0;
}
/**
* @param string $prefixPath
* @param array $searchProperties
* @param string $test
* @return array
*/
function searchPrincipals($prefixPath, array $searchProperties, $test = 'allof') {
$results = [];
if (\count($searchProperties) === 0) {
return [];
}
if ($prefixPath !== $this->principalPrefix) {
return [];
}
$user = $this->userSession->getUser();
if (!$user) {
return [];
}
$usersGroups = $this->groupManager->getUserGroupIds($user);
foreach ($searchProperties as $prop => $value) {
switch ($prop) {
case '{http://sabredav.org/ns}email-address':
$query = $this->db->getQueryBuilder();
$query->select(['id', 'backend_id', 'resource_id', 'email', 'displayname', 'group_restrictions'])
->from($this->dbTableName)
->where($query->expr()->iLike('email', $query->createNamedParameter('%' . $this->db->escapeLikeParameter($value) . '%')));
$stmt = $query->execute();
$principals = [];
while($row = $stmt->fetch(\PDO::FETCH_ASSOC)) {
if (!$this->isAllowedToAccessResource($row, $usersGroups)) {
continue;
}
$principals[] = $this->rowToPrincipal($row)['uri'];
}
$results[] = $principals;
$stmt->closeCursor();
break;
case '{DAV:}displayname':
$query = $this->db->getQueryBuilder();
$query->select(['id', 'backend_id', 'resource_id', 'email', 'displayname', 'group_restrictions'])
->from($this->dbTableName)
->where($query->expr()->iLike('displayname', $query->createNamedParameter('%' . $this->db->escapeLikeParameter($value) . '%')));
$stmt = $query->execute();
$principals = [];
while($row = $stmt->fetch(\PDO::FETCH_ASSOC)) {
if (!$this->isAllowedToAccessResource($row, $usersGroups)) {
continue;
}
$principals[] = $this->rowToPrincipal($row)['uri'];
}
$results[] = $principals;
$stmt->closeCursor();
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[] = $this->searchPrincipals($this->principalPrefix, [
'{http://sabredav.org/ns}email-address' => $value,
], 'anyof');
break;
default:
$rowsByMetadata = $this->searchPrincipalsByMetadataKey($prop, $value);
$filteredRows = array_filter($rowsByMetadata, function($row) use ($usersGroups) {
return $this->isAllowedToAccessResource($row, $usersGroups);
});
$results[] = array_map(function($row) {
return $row['uri'];
}, $filteredRows);
break;
}
}
// results is an array of arrays, so this is not the first search result
// but the results of the first searchProperty
if (count($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));
}
}
/**
* Searches principals based on their metadata keys.
* This allows to search for all principals with a specific key.
* e.g.:
* '{http://nextcloud.com/ns}room-building-address' => 'ABC Street 123, ...'
*
* @param $key
* @param $value
* @return array
*/
private function searchPrincipalsByMetadataKey($key, $value):array {
$query = $this->db->getQueryBuilder();
$query->select([$this->dbForeignKeyName])
->from($this->dbMetaDataTableName)
->where($query->expr()->eq('key', $query->createNamedParameter($key)))
->andWhere($query->expr()->iLike('value', $query->createNamedParameter('%' . $this->db->escapeLikeParameter($value) . '%')));
$stmt = $query->execute();
$rows = [];
while($row = $stmt->fetch(\PDO::FETCH_ASSOC)) {
$id = $row[$this->dbForeignKeyName];
$principalRow = $this->getPrincipalById($id);
if (!$principalRow) {
continue;
}
$rows[] = $principalRow;
}
return $rows;
}
/**
* @param string $uri
* @param string $principalPrefix
* @return null|string
*/
function findByUri($uri, $principalPrefix) {
$user = $this->userSession->getUser();
if (!$user) {
return null;
}
$usersGroups = $this->groupManager->getUserGroupIds($user);
if (strpos($uri, 'mailto:') === 0) {
$email = substr($uri, 7);
$query = $this->db->getQueryBuilder();
$query->select(['id', 'backend_id', 'resource_id', 'email', 'displayname', 'group_restrictions'])
->from($this->dbTableName)
->where($query->expr()->eq('email', $query->createNamedParameter($email)));
$stmt = $query->execute();
$row = $stmt->fetch(\PDO::FETCH_ASSOC);
if(!$row) {
return null;
}
if (!$this->isAllowedToAccessResource($row, $usersGroups)) {
return null;
}
return $this->rowToPrincipal($row)['uri'];
}
if (strpos($uri, 'principal:') === 0) {
$path = substr($uri, 10);
if (strpos($path, $this->principalPrefix) !== 0) {
return null;
}
list(, $name) = \Sabre\Uri\split($path);
list($backendId, $resourceId) = explode('-', $name, 2);
$query = $this->db->getQueryBuilder();
$query->select(['id', 'backend_id', 'resource_id', 'email', 'displayname', 'group_restrictions'])
->from($this->dbTableName)
->where($query->expr()->eq('backend_id', $query->createNamedParameter($backendId)))
->andWhere($query->expr()->eq('resource_id', $query->createNamedParameter($resourceId)));
$stmt = $query->execute();
$row = $stmt->fetch(\PDO::FETCH_ASSOC);
if(!$row) {
return null;
}
if (!$this->isAllowedToAccessResource($row, $usersGroups)) {
return null;
}
return $this->rowToPrincipal($row)['uri'];
}
return null;
}
/**
* convert database row to principal
*
* @param String[] $row
* @param String[] $metadata
* @return Array
*/
private function rowToPrincipal(array $row, array $metadata=[]):array {
return array_merge([
'uri' => $this->principalPrefix . '/' . $row['backend_id'] . '-' . $row['resource_id'],
'{DAV:}displayname' => $row['displayname'],
'{http://sabredav.org/ns}email-address' => $row['email'],
'{urn:ietf:params:xml:ns:caldav}calendar-user-type' => $this->cuType,
], $metadata);
}
/**
* @param $row
* @param $userGroups
* @return bool
*/
private function isAllowedToAccessResource(array $row, array $userGroups):bool {
if (!isset($row['group_restrictions']) ||
$row['group_restrictions'] === null ||
$row['group_restrictions'] === '') {
return true;
}
// group restrictions contains something, but not parsable, deny access and log warning
$json = json_decode($row['group_restrictions']);
if (!\is_array($json)) {
$this->logger->info('group_restrictions field could not be parsed for ' . $this->dbTableName . '::' . $row['id'] . ', denying access to resource');
return false;
}
// empty array => no group restrictions
if (empty($json)) {
return true;
}
return !empty(array_intersect($json, $userGroups));
}
}