Merge pull request #3562 from nextcloud/fix/3281-file-gets-truncated-…

…on-save-when-quota-is-exceeded

don't alter file when there is not enough free space

lib/Controller/WopiController.php

@@ -485,7 +485,13 @@ public function putFile($fileId,
 
 			$content = fopen('php://input', 'rb');
 
+			$freespace = $file->getParent()->getFreeSpace();
+			$contentLength = (int)$this->request->getHeader('Content-Length');
+
 			try {
+				if ($freespace >= 0 && $contentLength > $freespace) {
+					throw new \Exception('Not enough storage');
+				}
 				$this->wrappedFilesystemOperation($wopi, function () use ($file, $content) {
 					return $file->putContent($content);
 				});