add propfind to detect encryption status

Signed-off-by: Bjoern Schiessle <bjoern@schiessle.org>

apps/dav/lib/Connector/Sabre/FilesPlugin.php

@@ -66,6 +66,7 @@ class FilesPlugin extends ServerPlugin {
 	const DATA_FINGERPRINT_PROPERTYNAME = '{http://owncloud.org/ns}data-fingerprint';
 	const HAS_PREVIEW_PROPERTYNAME = '{http://nextcloud.org/ns}has-preview';
 	const MOUNT_TYPE_PROPERTYNAME = '{http://nextcloud.org/ns}mount-type';
+	const IS_ENCRYPTED_PROPERTYNAME = '{http://nextcloud.org/ns}is-encrypted';
 
 	/**
 	 * Reference to main server object
@@ -146,7 +147,6 @@ class FilesPlugin extends ServerPlugin {
 	 * @return void
 	 */
 	public function initialize(\Sabre\DAV\Server $server) {
-
 		$server->xml->namespaceMap[self::NS_OWNCLOUD] = 'oc';
 		$server->xml->namespaceMap[self::NS_NEXTCLOUD] = 'nc';
 		$server->protectedProperties[] = self::FILEID_PROPERTYNAME;
@@ -161,6 +161,7 @@ class FilesPlugin extends ServerPlugin {
 		$server->protectedProperties[] = self::DATA_FINGERPRINT_PROPERTYNAME;
 		$server->protectedProperties[] = self::HAS_PREVIEW_PROPERTYNAME;
 		$server->protectedProperties[] = self::MOUNT_TYPE_PROPERTYNAME;
+		$server->protectedProperties[] = self::IS_ENCRYPTED_PROPERTYNAME;
 
 		// normally these cannot be changed (RFC4918), but we want them modifiable through PROPPATCH
 		$allowedProperties = ['{DAV:}getetag'];
@@ -343,6 +344,11 @@ class FilesPlugin extends ServerPlugin {
 				}
 			});
 
+			$propFind->handle(self::IS_ENCRYPTED_PROPERTYNAME, function() use ($node) {
+				$result = $node->getFileInfo()->isEncrypted() ? '1' : '0';
+				return $result;
+			});
+
 			$propFind->handle(self::HAS_PREVIEW_PROPERTYNAME, function () use ($node) {
 				return json_encode($this->previewManager->isAvailable($node->getFileInfo()));
 			});