1 files changed, 99 insertions, 0 deletions
diff --git a/apps/files_versions/lib/Sabre/Plugin.php b/apps/files_versions/lib/Sabre/Plugin.php
new file mode 100644
index 00000000000..984c4a36e5b
--- /dev/null
+++ b/apps/files_versions/lib/Sabre/Plugin.php
@@ -0,0 +1,99 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * SPDX-FileCopyrightText: 2019 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+namespace OCA\Files_Versions\Sabre;
+
+use OC\AppFramework\Http\Request;
+use OCA\DAV\Connector\Sabre\FilesPlugin;
+use OCP\IPreview;
+use OCP\IRequest;
+use Sabre\DAV\Exception\NotFound;
+use Sabre\DAV\INode;
+use Sabre\DAV\PropFind;
+use Sabre\DAV\PropPatch;
+use Sabre\DAV\Server;
+use Sabre\DAV\ServerPlugin;
+use Sabre\HTTP\RequestInterface;
+use Sabre\HTTP\ResponseInterface;
+
+class Plugin extends ServerPlugin {
+	private Server $server;
+
+	public const LABEL = 'label';
+
+	public const AUTHOR = 'author';
+
+	public const VERSION_LABEL = '{http://nextcloud.org/ns}version-label';
+
+	public const VERSION_AUTHOR = '{http://nextcloud.org/ns}version-author'; // dav property for author
+
+	public function __construct(
+		private IRequest $request,
+		private IPreview $previewManager,
+	) {
+		$this->request = $request;
+	}
+
+	public function initialize(Server $server) {
+		$this->server = $server;
+
+		$server->on('afterMethod:GET', [$this, 'afterGet']);
+		$server->on('propFind', [$this, 'propFind']);
+		$server->on('propPatch', [$this, 'propPatch']);
+	}
+
+	public function afterGet(RequestInterface $request, ResponseInterface $response) {
+		$path = $request->getPath();
+		if (!str_starts_with($path, 'versions')) {
+			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) . '"');
+		}
+	}
+
+	public function propFind(PropFind $propFind, INode $node): void {
+		if ($node instanceof VersionFile) {
+			$propFind->handle(self::VERSION_LABEL, fn () => $node->getMetadataValue(self::LABEL));
+			$propFind->handle(self::VERSION_AUTHOR, fn () => $node->getMetadataValue(self::AUTHOR));
+			$propFind->handle(
+				FilesPlugin::HAS_PREVIEW_PROPERTYNAME,
+				fn (): string => $this->previewManager->isMimeSupported($node->getContentType()) ? 'true' : 'false',
+			);
+		}
+	}
+
+	public function propPatch($path, PropPatch $propPatch): void {
+		$node = $this->server->tree->getNodeForPath($path);
+
+		if ($node instanceof VersionFile) {
+			$propPatch->handle(self::VERSION_LABEL, fn (string $label) => $node->setMetadataValue(self::LABEL, $label));
+		}
+	}
+}