Set the proper filename for version downloads

Before it just used the internalid (timestamp often) which is not really
user friendly.

Signed-off-by: Roeland Jago Douma <roeland@famdouma.nl>

apps/files_versions/appinfo/info.xml

@@ -37,6 +37,9 @@
 	</commands>
 
 	<sabre>
+		<plugins>
+			<plugin>OCA\Files_Versions\Sabre\Plugin</plugin>
+		</plugins>
 		<collections>
 			<collection>OCA\Files_Versions\Sabre\RootCollection</collection>
 		</collections>

apps/files_versions/composer/composer/autoload_classmap.php

@@ -16,6 +16,7 @@ return array(
     'OCA\\Files_Versions\\Events\\CreateVersionEvent' => $baseDir . '/../lib/Events/CreateVersionEvent.php',
     'OCA\\Files_Versions\\Expiration' => $baseDir . '/../lib/Expiration.php',
     'OCA\\Files_Versions\\Hooks' => $baseDir . '/../lib/Hooks.php',
+    'OCA\\Files_Versions\\Sabre\\Plugin' => $baseDir . '/../lib/Sabre/Plugin.php',
     'OCA\\Files_Versions\\Sabre\\RestoreFolder' => $baseDir . '/../lib/Sabre/RestoreFolder.php',
     'OCA\\Files_Versions\\Sabre\\RootCollection' => $baseDir . '/../lib/Sabre/RootCollection.php',
     'OCA\\Files_Versions\\Sabre\\VersionCollection' => $baseDir . '/../lib/Sabre/VersionCollection.php',

apps/files_versions/composer/composer/autoload_static.php

@@ -31,6 +31,7 @@ class ComposerStaticInitFiles_Versions
         'OCA\\Files_Versions\\Events\\CreateVersionEvent' => __DIR__ . '/..' . '/../lib/Events/CreateVersionEvent.php',
         'OCA\\Files_Versions\\Expiration' => __DIR__ . '/..' . '/../lib/Expiration.php',
         'OCA\\Files_Versions\\Hooks' => __DIR__ . '/..' . '/../lib/Hooks.php',
+        'OCA\\Files_Versions\\Sabre\\Plugin' => __DIR__ . '/..' . '/../lib/Sabre/Plugin.php',
         'OCA\\Files_Versions\\Sabre\\RestoreFolder' => __DIR__ . '/..' . '/../lib/Sabre/RestoreFolder.php',
         'OCA\\Files_Versions\\Sabre\\RootCollection' => __DIR__ . '/..' . '/../lib/Sabre/RootCollection.php',
         'OCA\\Files_Versions\\Sabre\\VersionCollection' => __DIR__ . '/..' . '/../lib/Sabre/VersionCollection.php',

apps/files_versions/lib/Sabre/Plugin.php

@@ -0,0 +1,83 @@
+<?php
+declare(strict_types=1);
+/**
+ * @copyright Copyright (c) 2019, Roeland Jago Douma <roeland@famdouma.nl>
+ *
+ * @author Roeland Jago Douma <roeland@famdouma.nl>
+ *
+ * @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\Files_Versions\Sabre;
+
+use OC\AppFramework\Http\Request;
+use OCP\IRequest;
+use Sabre\DAV\Exception\NotFound;
+use Sabre\DAV\Server;
+use Sabre\DAV\ServerPlugin;
+use Sabre\HTTP\RequestInterface;
+use Sabre\HTTP\ResponseInterface;
+
+class Plugin extends ServerPlugin {
+
+	/** @var Server */
+	private $server;
+	/** @var IRequest */
+	private $request;
+
+	function __construct(IRequest $request) {
+		$this->request = $request;
+	}
+
+	function initialize(Server $server) {
+		$this->server = $server;
+
+		$server->on('afterMethod:GET', [$this, 'afterGet']);
+	}
+
+	public function afterGet(RequestInterface $request, ResponseInterface $response) {
+		$path = $request->getPath();
+		if (strpos($path, 'versions') !== 0) {
+			return;
+		}
+
+		try {
+			$node = $this->server->tree->getNodeForPath($path);
+		} catch (NotFound $e) {
+			return;
+		}
+
+		if (!($node instanceof VersionFile)) {
+			return;
+		}
+
+		$filename = $node->getVersion()->getSourceFileName();
+
+		if ($this->request->isUserAgent(
+			[
+				Request::USER_AGENT_IE,
+				Request::USER_AGENT_ANDROID_MOBILE_CHROME,
+				Request::USER_AGENT_FREEBOX,
+			])) {
+			$response->addHeader('Content-Disposition', 'attachment; filename="' . rawurlencode($filename) . '"');
+		} else {
+			$response->addHeader('Content-Disposition', 'attachment; filename*=UTF-8\'\'' . rawurlencode($filename)
+				. '; filename="' . rawurlencode($filename) . '"');
+		}
+	}
+
+}

apps/files_versions/lib/Sabre/VersionFile.php

@@ -86,4 +86,8 @@ class VersionFile implements IFile {
 	public function rollBack() {
 		$this->versionManager->rollback($this->version);
 	}
+
+	public function getVersion(): IVersion {
+		return $this->version;
+	}
 }