nextcloud/apps/dav/lib/BackgroundJob/UpdateCalendarResourcesRoom...

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<?php
/**
* @copyright 2019, Georg Ehrke <oc.list@georgehrke.com>
*
* @author Georg Ehrke <oc.list@georgehrke.com>
*
* @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\BackgroundJob;
use OC\BackgroundJob\TimedJob;
use OCA\DAV\CalDAV\CalDavBackend;
use OCP\Calendar\BackendTemporarilyUnavailableException;
use OCP\Calendar\IMetadataProvider;
use OCP\Calendar\Resource\IBackend as IResourceBackend;
use OCP\Calendar\Resource\IManager as IResourceManager;
use OCP\Calendar\Resource\IResource;
use OCP\Calendar\Room\IManager as IRoomManager;
use OCP\Calendar\Room\IRoom;
use OCP\IDBConnection;
class UpdateCalendarResourcesRoomsBackgroundJob extends TimedJob {
/** @var IResourceManager */
private $resourceManager;
/** @var IRoomManager */
private $roomManager;
/** @var IDBConnection */
private $dbConnection;
/** @var CalDavBackend */
private $calDavBackend;
/**
* UpdateCalendarResourcesRoomsBackgroundJob constructor.
*
* @param IResourceManager $resourceManager
* @param IRoomManager $roomManager
* @param IDBConnection $dbConnection
* @param CalDavBackend $calDavBackend
*/
public function __construct(IResourceManager $resourceManager,
IRoomManager $roomManager,
IDBConnection $dbConnection,
CalDavBackend $calDavBackend) {
$this->resourceManager = $resourceManager;
$this->roomManager = $roomManager;
$this->dbConnection = $dbConnection;
$this->calDavBackend = $calDavBackend;
// run once an hour
$this->setInterval(60 * 60);
}
/**
* @param $argument
*/
public function run($argument):void {
$this->runForBackend(
$this->resourceManager,
'calendar_resources',
'calendar_resources_md',
'resource_id',
'principals/calendar-resources'
);
$this->runForBackend(
$this->roomManager,
'calendar_rooms',
'calendar_rooms_md',
'room_id',
'principals/calendar-rooms'
);
}
/**
* Run background-job for one specific backendManager
* either ResourceManager or RoomManager
*
* @param IResourceManager|IRoomManager $backendManager
* @param string $dbTable
* @param string $dbTableMetadata
* @param string $foreignKey
* @param string $principalPrefix
*/
private function runForBackend($backendManager,
string $dbTable,
string $dbTableMetadata,
string $foreignKey,
string $principalPrefix):void {
$backends = $backendManager->getBackends();
foreach ($backends as $backend) {
$backendId = $backend->getBackendIdentifier();
try {
if ($backend instanceof IResourceBackend) {
$list = $backend->listAllResources();
} else {
$list = $backend->listAllRooms();
}
} catch (BackendTemporarilyUnavailableException $ex) {
continue;
}
$cachedList = $this->getAllCachedByBackend($dbTable, $backendId);
$newIds = array_diff($list, $cachedList);
$deletedIds = array_diff($cachedList, $list);
$editedIds = array_intersect($list, $cachedList);
foreach ($newIds as $newId) {
try {
if ($backend instanceof IResourceBackend) {
$resource = $backend->getResource($newId);
} else {
$resource = $backend->getRoom($newId);
}
$metadata = [];
if ($resource instanceof IMetadataProvider) {
$metadata = $this->getAllMetadataOfBackend($resource);
}
} catch (BackendTemporarilyUnavailableException $ex) {
continue;
}
$id = $this->addToCache($dbTable, $backendId, $resource);
$this->addMetadataToCache($dbTableMetadata, $foreignKey, $id, $metadata);
// we don't create the calendar here, it is created lazily
// when an event is actually scheduled with this resource / room
}
foreach ($deletedIds as $deletedId) {
$id = $this->getIdForBackendAndResource($dbTable, $backendId, $deletedId);
$this->deleteFromCache($dbTable, $id);
$this->deleteMetadataFromCache($dbTableMetadata, $foreignKey, $id);
$principalName = implode('-', [$backendId, $deletedId]);
$this->deleteCalendarDataForResource($principalPrefix, $principalName);
}
foreach ($editedIds as $editedId) {
$id = $this->getIdForBackendAndResource($dbTable, $backendId, $editedId);
try {
if ($backend instanceof IResourceBackend) {
$resource = $backend->getResource($editedId);
} else {
$resource = $backend->getRoom($editedId);
}
$metadata = [];
if ($resource instanceof IMetadataProvider) {
$metadata = $this->getAllMetadataOfBackend($resource);
}
} catch (BackendTemporarilyUnavailableException $ex) {
continue;
}
$this->updateCache($dbTable, $id, $resource);
if ($resource instanceof IMetadataProvider) {
$cachedMetadata = $this->getAllMetadataOfCache($dbTableMetadata, $foreignKey, $id);
$this->updateMetadataCache($dbTableMetadata, $foreignKey, $id, $metadata, $cachedMetadata);
}
}
}
}
/**
* add entry to cache that exists remotely but not yet in cache
*
* @param string $table
* @param string $backendId
* @param IResource|IRoom $remote
* @return int Insert id
*/
private function addToCache(string $table,
string $backendId,
$remote):int {
$query = $this->dbConnection->getQueryBuilder();
$query->insert($table)
->values([
'backend_id' => $query->createNamedParameter($backendId),
'resource_id' => $query->createNamedParameter($remote->getId()),
'email' => $query->createNamedParameter($remote->getEMail()),
'displayname' => $query->createNamedParameter($remote->getDisplayName()),
'group_restrictions' => $query->createNamedParameter(
$this->serializeGroupRestrictions(
$remote->getGroupRestrictions()
))
])
->execute();
return $query->getLastInsertId();
}
/**
* @param string $table
* @param string $foreignKey
* @param int $foreignId
* @param array $metadata
*/
private function addMetadataToCache(string $table,
string $foreignKey,
int $foreignId,
array $metadata):void {
foreach ($metadata as $key => $value) {
$query = $this->dbConnection->getQueryBuilder();
$query->insert($table)
->values([
$foreignKey => $query->createNamedParameter($foreignId),
'key' => $query->createNamedParameter($key),
'value' => $query->createNamedParameter($value),
])
->execute();
}
}
/**
* delete entry from cache that does not exist anymore remotely
*
* @param string $table
* @param int $id
*/
private function deleteFromCache(string $table,
int $id):void {
$query = $this->dbConnection->getQueryBuilder();
$query->delete($table)
->where($query->expr()->eq('id', $query->createNamedParameter($id)))
->execute();
}
/**
* @param string $table
* @param string $foreignKey
* @param int $id
*/
private function deleteMetadataFromCache(string $table,
string $foreignKey,
int $id):void {
$query = $this->dbConnection->getQueryBuilder();
$query->delete($table)
->where($query->expr()->eq($foreignKey, $query->createNamedParameter($id)))
->execute();
}
/**
* update an existing entry in cache
*
* @param string $table
* @param int $id
* @param IResource|IRoom $remote
*/
private function updateCache(string $table,
int $id,
$remote):void {
$query = $this->dbConnection->getQueryBuilder();
$query->update($table)
->set('email', $query->createNamedParameter($remote->getEMail()))
->set('displayname', $query->createNamedParameter($remote->getDisplayName()))
->set('group_restrictions', $query->createNamedParameter(
$this->serializeGroupRestrictions(
$remote->getGroupRestrictions()
)))
->where($query->expr()->eq('id', $query->createNamedParameter($id)))
->execute();
}
/**
* @param string $dbTable
* @param string $foreignKey
* @param int $id
* @param array $metadata
* @param array $cachedMetadata
*/
private function updateMetadataCache(string $dbTable,
string $foreignKey,
int $id,
array $metadata,
array $cachedMetadata):void {
$newMetadata = array_diff_key($metadata, $cachedMetadata);
$deletedMetadata = array_diff_key($cachedMetadata, $metadata);
foreach ($newMetadata as $key => $value) {
$query = $this->dbConnection->getQueryBuilder();
$query->insert($dbTable)
->values([
$foreignKey => $query->createNamedParameter($id),
'key' => $query->createNamedParameter($key),
'value' => $query->createNamedParameter($value),
])
->execute();
}
foreach ($deletedMetadata as $key => $value) {
$query = $this->dbConnection->getQueryBuilder();
$query->delete($dbTable)
->where($query->expr()->eq($foreignKey, $query->createNamedParameter($id)))
->andWhere($query->expr()->eq('key', $query->createNamedParameter($key)))
->execute();
}
$existingKeys = array_keys(array_intersect_key($metadata, $cachedMetadata));
foreach ($existingKeys as $existingKey) {
if ($metadata[$existingKey] !== $cachedMetadata[$existingKey]) {
$query = $this->dbConnection->getQueryBuilder();
$query->update($dbTable)
->set('value', $query->createNamedParameter($metadata[$existingKey]))
->where($query->expr()->eq($foreignKey, $query->createNamedParameter($id)))
->andWhere($query->expr()->eq('key', $query->createNamedParameter($existingKey)))
->execute();
}
}
}
/**
* serialize array of group restrictions to store them in database
*
* @param array $groups
* @return string
*/
private function serializeGroupRestrictions(array $groups):string {
return \json_encode($groups);
}
/**
* Gets all metadata of a backend
*
* @param IResource|IRoom $resource
* @return array
*/
private function getAllMetadataOfBackend($resource):array {
if (!($resource instanceof IMetadataProvider)) {
return [];
}
$keys = $resource->getAllAvailableMetadataKeys();
$metadata = [];
foreach ($keys as $key) {
$metadata[$key] = $resource->getMetadataForKey($key);
}
return $metadata;
}
/**
* @param string $table
* @param string $foreignKey
* @param int $id
* @return array
*/
private function getAllMetadataOfCache(string $table,
string $foreignKey,
int $id):array {
$query = $this->dbConnection->getQueryBuilder();
$query->select(['key', 'value'])
->from($table)
->where($query->expr()->eq($foreignKey, $query->createNamedParameter($id)));
$stmt = $query->execute();
$rows = $stmt->fetchAll(\PDO::FETCH_ASSOC);
$metadata = [];
foreach ($rows as $row) {
$metadata[$row['key']] = $row['value'];
}
return $metadata;
}
/**
* Gets all cached rooms / resources by backend
*
* @param $tableName
* @param $backendId
* @return array
*/
private function getAllCachedByBackend(string $tableName,
string $backendId):array {
$query = $this->dbConnection->getQueryBuilder();
$query->select('resource_id')
->from($tableName)
->where($query->expr()->eq('backend_id', $query->createNamedParameter($backendId)));
$stmt = $query->execute();
return array_map(function ($row) {
return $row['resource_id'];
}, $stmt->fetchAll(\PDO::FETCH_NAMED));
}
/**
* @param $principalPrefix
* @param $principalUri
*/
private function deleteCalendarDataForResource(string $principalPrefix,
string $principalUri):void {
$calendar = $this->calDavBackend->getCalendarByUri(
implode('/', [$principalPrefix, $principalUri]),
CalDavBackend::RESOURCE_BOOKING_CALENDAR_URI);
if ($calendar !== null) {
$this->calDavBackend->deleteCalendar($calendar['id']);
}
}
/**
* @param $table
* @param $backendId
* @param $resourceId
* @return int
*/
private function getIdForBackendAndResource(string $table,
string $backendId,
string $resourceId):int {
$query = $this->dbConnection->getQueryBuilder();
$query->select('id')
->from($table)
->where($query->expr()->eq('backend_id', $query->createNamedParameter($backendId)))
->andWhere($query->expr()->eq('resource_id', $query->createNamedParameter($resourceId)));
$stmt = $query->execute();
return $stmt->fetch(\PDO::FETCH_NAMED)['id'];
}
}