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<?php |
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/** |
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* @author Thomas Müller <[email protected]> |
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* |
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* @copyright Copyright (c) 2017, ownCloud GmbH |
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* @license AGPL-3.0 |
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* |
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* This code is free software: you can redistribute it and/or modify |
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* it under the terms of the GNU Affero General Public License, version 3, |
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* as published by the Free Software Foundation. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU Affero General Public License for more details. |
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* |
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* You should have received a copy of the GNU Affero General Public License, version 3, |
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* along with this program. If not, see <http://www.gnu.org/licenses/> |
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* |
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*/ |
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namespace OCA\DAV\Files; |
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use OCP\Files\ForbiddenException; |
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use OCP\Files\IPreviewNode; |
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use OCP\ILogger; |
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use Sabre\DAV\Exception\NotFound; |
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use Sabre\DAV\Server; |
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use Sabre\DAV\ServerPlugin; |
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use Sabre\HTTP\RequestInterface; |
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use Sabre\HTTP\ResponseInterface; |
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use OCA\DAV\Connector\Sabre\Exception\Forbidden as DAVForbiddenException; |
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class PreviewPlugin extends ServerPlugin { |
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/** @var Server */ |
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protected $server; |
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/** @var ILogger */ |
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private $logger; |
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public function __construct(ILogger $logger) { |
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$this->logger = $logger; |
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} |
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/** |
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* Initializes the plugin and registers event handlers |
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* |
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* @param Server $server |
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* @return void |
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*/ |
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function initialize(Server $server) { |
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$this->server = $server; |
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$this->server->on('method:GET', [$this, 'httpGet'], 90); |
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} |
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/** |
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* Intercepts GET requests on node urls ending with ?preview. |
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* The node has to implement IPreviewNode |
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* |
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* @param RequestInterface $request |
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* @param ResponseInterface $response |
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* @return bool |
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* @throws NotFound |
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* @throws \Sabre\DAVACL\Exception\NeedPrivileges |
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* @throws \Sabre\DAV\Exception\NotAuthenticated |
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*/ |
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function httpGet(RequestInterface $request, ResponseInterface $response) { |
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$queryParams = $request->getQueryParameters(); |
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if (!array_key_exists('preview', $queryParams)) { |
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return true; |
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} |
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$path = $request->getPath(); |
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$node = $this->server->tree->getNodeForPath($path); |
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if (!$node instanceof IFileNode) { |
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return false; |
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} |
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$fileNode = $node->getNode(); |
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if (!$fileNode instanceof IPreviewNode) { |
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return false; |
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} |
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// Checking ACL, if available. |
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if ($aclPlugin = $this->server->getPlugin('acl')) { |
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/** @var \Sabre\DAVACL\Plugin $aclPlugin */ |
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$aclPlugin->checkPrivileges($path, '{DAV:}read'); |
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} |
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try { |
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$image = $fileNode->getThumbnail($queryParams); |
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} catch (ForbiddenException $ex) { |
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throw new DAVForbiddenException($ex->getMessage(), $ex->getRetry()); |
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} |
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if ($image) { |
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if ($image === null || !$image->valid()) { |
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throw new NotFound(); |
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} |
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$type = $image->mimeType(); |
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if (!in_array($type, ['image/png', 'image/jpeg', 'image/gif'])) { |
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$type = 'application/octet-stream'; |
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} |
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// Enable output buffering |
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ob_start(); |
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// Capture the output |
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$image->show(); |
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$imageData = ob_get_contents(); |
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// Clear the output buffer |
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ob_end_clean(); |
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$response->setHeader('Content-Type', $type); |
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$response->setHeader('Content-Disposition', 'attachment'); |
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// cache 24h |
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$response->setHeader('Cache-Control', 'max-age=86400, must-revalidate'); |
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$response->setHeader('Expires', gmdate ("D, d M Y H:i:s", time() + 86400) . " GMT"); |
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$response->setStatus(200); |
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$response->setBody($imageData); |
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// Returning false to break the event chain |
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return false; |
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} |
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// TODO: add forceIcon handling .... if still needed |
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throw new NotFound(); |
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} |
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} |
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owncloud /
core
