First steps of zip folder plugin

apps/dav/lib/server.php

@@ -32,6 +32,7 @@ public function __construct(IRequest $request, $baseUri) {
 
 		$this->server->addPlugin(new BlockLegacyClientPlugin(\OC::$server->getConfig()));
 		$this->server->addPlugin(new Plugin($authBackend, 'ownCloud'));
+		$this->server->addPlugin(new ZipFolderPlugin());
 
 		// wait with registering these until auth is handled and the filesystem is setup
 		$this->server->on('beforeMethod', function () {

apps/dav/lib/zipfolderplugin.php

@@ -0,0 +1,76 @@
+<?php
+/**
+ * @author Thomas Müller <[email protected]>
+ *
+ * @copyright Copyright (c) 2015, 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;
+
+use OCA\DAV\Connector\Sabre\Directory;
+use Sabre\DAV\Server;
+use Sabre\DAV\ServerPlugin;
+use Sabre\HTTP\RequestInterface;
+use Sabre\HTTP\ResponseInterface;
+
+class ZipFolderPlugin extends ServerPlugin {
+
+	/** @var Server */
+	private $server;
+
+	/**
+	 * This initializes the plugin.
+	 *
+	 * This function is called by Sabre\DAV\Server, after
+	 * addPlugin is called.
+	 *
+	 * This method should set up the required event subscriptions.
+	 *
+	 * @param Server $server
+	 * @return void
+	 */
+	function initialize(Server $server) {
+		$this->server = $server;
+		$server->on('beforeMethod', array($this, 'downloadFolderAsZip'), 30);
+	}
+
+	function downloadFolderAsZip(RequestInterface $request, ResponseInterface $response) {
+		if ($request->getMethod() !== 'GET') {
+			return;
+		}
+		$path = $request->getPath();
+		if ($this->server->tree->nodeExists($path))
+			return;
+
+		$elements = pathinfo($path);
+		$ext = isset($elements['extension']) ? $elements['extension'] : null;
+		if (is_null($ext) || !in_array($ext, ['zip', 'tar'])) {
+			return;
+		}
+
+		$pathToFolder = substr($path, 0, -4);
+		$node = $this->server->tree->getNodeForPath($pathToFolder);
+
+		if (!$node instanceof Directory)
+			return;
+
+		//
+		// TODO: build a Tar and a Zip Streamer which use php streams
+		//
+		$response->setBody();
+	}
+}