1 files changed, 146 insertions, 0 deletions
diff --git a/apps/dav/lib/CardDAV/ImageExportPlugin.php b/apps/dav/lib/CardDAV/ImageExportPlugin.php
new file mode 100644
index 00000000000..3f505222491
--- /dev/null
+++ b/apps/dav/lib/CardDAV/ImageExportPlugin.php
@@ -0,0 +1,146 @@
+<?php
+/**
+ * @author Thomas Müller <thomas.mueller@tmit.eu>
+ *
+ * @copyright Copyright (c) 2016, ownCloud, Inc.
+ * @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)) {
+			$response->setHeader('Content-Type', $result['Content-Type']);
+			$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);
+
+			$valType = $photo->getValueType();
+			$val = ($valType === 'URI' ? $photo->getRawMimeDirValue() : $photo->getValue());
+			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 '';
+	}
+}