nextcloud-server/apps/files_versions/lib/Sabre/Plugin.php

<?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 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('label'));
			$propFind->handle(self::VERSION_AUTHOR, fn () => $node->getMetadataValue('author'));
			$propFind->handle(FilesPlugin::HAS_PREVIEW_PROPERTYNAME, fn () => $this->previewManager->isMimeSupported($node->getContentType()));
		}
	}

	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('label', $label));
		}
	}
}