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<?php
/**
* @copyright Copyright (c) 2016, ownCloud, Inc.
*
* @author Georg Ehrke <georg@owncloud.com>
*
* @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/>
*
*/
namespace OCA\DAV\CardDAV;
use OCP\ILogger;
use Sabre\CardDAV\Card;
use Sabre\DAV\Server;
use Sabre\DAV\ServerPlugin;
use Sabre\HTTP\RequestInterface;
use Sabre\HTTP\ResponseInterface;
use Sabre\VObject\Parameter;
use Sabre\VObject\Property\Binary;
use Sabre\VObject\Reader;
class ImageExportPlugin extends ServerPlugin {
/** @var Server */
protected $server;
/** @var ILogger */
private $logger;
public function __construct(ILogger $logger) {
$this->logger = $logger;
}
/**
* Initializes the plugin and registers event handlers
*
* @param Server $server
* @return void
*/
function initialize(Server $server) {
$this->server = $server;
$this->server->on('method:GET', [$this, 'httpGet'], 90);
}
/**
* Intercepts GET requests on addressbook urls ending with ?photo.
*
* @param RequestInterface $request
* @param ResponseInterface $response
* @return bool|void
*/
function httpGet(RequestInterface $request, ResponseInterface $response) {
$queryParams = $request->getQueryParameters();
// TODO: in addition to photo we should also add logo some point in time
if (!array_key_exists('photo', $queryParams)) {
return true;
}
$path = $request->getPath();
$node = $this->server->tree->getNodeForPath($path);
if (!($node instanceof Card)) {
return true;
}
$this->server->transactionType = 'carddav-image-export';
// Checking ACL, if available.
if ($aclPlugin = $this->server->getPlugin('acl')) {
/** @var \Sabre\DAVACL\Plugin $aclPlugin */
$aclPlugin->checkPrivileges($path, '{DAV:}read');
}
if ($result = $this->getPhoto($node)) {
// Allow caching
$response->setHeader('Cache-Control', 'private, max-age=3600, must-revalidate');
$response->setHeader('Etag', $node->getETag() );
$response->setHeader('Pragma', 'public');
$response->setHeader('Content-Type', $result['Content-Type']);
$response->setHeader('Content-Disposition', 'attachment');
$response->setStatus(200);
$response->setBody($result['body']);
// Returning false to break the event chain
return false;
}
return true;
}
function getPhoto(Card $node) {
// TODO: this is kind of expensive - load carddav data from database and parse it
// we might want to build up a cache one day
try {
$vObject = $this->readCard($node->get());
if (!$vObject->PHOTO) {
return false;
}
$photo = $vObject->PHOTO;
$type = $this->getType($photo);
$val = $photo->getValue();
if ($photo->getValueType() === 'URI') {
$parsed = \Sabre\URI\parse($val);
//only allow data://
if ($parsed['scheme'] !== 'data') {
return false;
}
if (substr_count($parsed['path'], ';') === 1) {
list($type,) = explode(';', $parsed['path']);
}
$val = file_get_contents($val);
}
$allowedContentTypes = [
'image/png',
'image/jpeg',
'image/gif',
];
if(!in_array($type, $allowedContentTypes, true)) {
$type = 'application/octet-stream';
}
return [
'Content-Type' => $type,
'body' => $val
];
} catch(\Exception $ex) {
$this->logger->logException($ex);
}
return false;
}
private function readCard($cardData) {
return Reader::read($cardData);
}
/**
* @param Binary $photo
* @return Parameter
*/
private function getType($photo) {
$params = $photo->parameters();
if (isset($params['TYPE']) || isset($params['MEDIATYPE'])) {
/** @var Parameter $typeParam */
$typeParam = isset($params['TYPE']) ? $params['TYPE'] : $params['MEDIATYPE'];
$type = $typeParam->getValue();
if (strpos($type, 'image/') === 0) {
return $type;
} else {
return 'image/' . strtolower($type);
}
}
return '';
}
}
|
