prevent user from creating or renaming sth. to an existing filename

- show tooltip when violating naming constraints while typing
- when target filename exists on server fallback to dialog to interrupt the users flow because something unexpected went wrong
- fixes #5062
- also fixes some whitespace and codestyle issues in files js
- uses css selector over filterAttr in touched js files

1 files changed, 9 insertions, 1 deletions

diff --git a/apps/files/lib/app.php b/apps/files/lib/app.php
index 579e8676cfc..ccf629ae3cb 100644
--- a/apps/files/lib/app.php
+++ b/apps/files/lib/app.php
@@ -52,7 +52,15 @@ class App {
 			$result['data'] = array(
 				'message'	=> $this->l10n->t("Invalid folder name. Usage of 'Shared' is reserved by ownCloud")
 			);
-		} elseif(
+		// rename to existing file is denied
+		} else if ($this->view->file_exists($dir . '/' . $newname)) {
+			
+			$result['data'] = array(
+				'message'	=> $this->l10n->t(
+						"The name %s is already used in the folder %s. Please choose a different name.",
+						array($newname, $dir))
+			);
+		} else if (
 			// rename to "." is denied
 			$newname !== '.' and
 			// rename of  "/Shared" is denied