Merge pull request #1697 from nextcloud/backport/1695/stable21

[stable21] Log exceptions that happen on unknown exception and return generic messages

lib/Service/ApiService.php

@@ -95,7 +95,8 @@ public function create($fileId = null, $filePath = null, $token = null, $guestNa
 
 			$document = $this->documentService->createDocument($file);
 		} catch (Exception $e) {
-			return new DataResponse($e->getMessage(), 500);
+			$this->logger->logException($e);
+			return new DataResponse('Failed to create the document session', 500);
 		}
 
 		$session = $this->sessionService->initSession($document->getId(), $guestName);
@@ -187,9 +188,9 @@ public function sync($documentId, $sessionId, $sessionToken, $version = 0, $auto
 		} catch (NotFoundException $e) {
 			return new DataResponse([], 404);
 		} catch (Exception $e) {
-			$this->logger->logException($e, ['level' => ILogger::INFO]);
+			$this->logger->logException($e);
 			return new DataResponse([
-				'message' => $e->getMessage()
+				'message' => 'Failed to autosave document'
 			], 500);
 		}