1 files changed, 55 insertions, 0 deletions
diff --git a/apps/dav/lib/Connector/Sabre/ChecksumUpdatePlugin.php b/apps/dav/lib/Connector/Sabre/ChecksumUpdatePlugin.php
new file mode 100644
index 00000000000..18009080585
--- /dev/null
+++ b/apps/dav/lib/Connector/Sabre/ChecksumUpdatePlugin.php
@@ -0,0 +1,55 @@
+<?php
+
+declare(strict_types=1);
+/**
+ * SPDX-FileCopyrightText: 2021 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+namespace OCA\DAV\Connector\Sabre;
+
+use OCP\AppFramework\Http;
+use Sabre\DAV\Server;
+use Sabre\DAV\ServerPlugin;
+use Sabre\HTTP\RequestInterface;
+use Sabre\HTTP\ResponseInterface;
+
+class ChecksumUpdatePlugin extends ServerPlugin {
+	protected ?Server $server = null;
+
+	public function initialize(Server $server) {
+		$this->server = $server;
+		$server->on('method:PATCH', [$this, 'httpPatch']);
+	}
+
+	public function getPluginName(): string {
+		return 'checksumupdate';
+	}
+
+	/** @return string[] */
+	public function getFeatures(): array {
+		return ['nextcloud-checksum-update'];
+	}
+
+	public function httpPatch(RequestInterface $request, ResponseInterface $response) {
+		$path = $request->getPath();
+
+		$node = $this->server->tree->getNodeForPath($path);
+		if ($node instanceof File) {
+			$type = strtolower(
+				(string)$request->getHeader('X-Recalculate-Hash')
+			);
+
+			$hash = $node->hash($type);
+			if ($hash) {
+				$checksum = strtoupper($type) . ':' . $hash;
+				$node->setChecksum($checksum);
+				$response->addHeader('OC-Checksum', $checksum);
+				$response->setHeader('Content-Length', '0');
+				$response->setStatus(Http::STATUS_NO_CONTENT);
+
+				return false;
+			}
+		}
+	}
+}