diff --git a/apps/files_external/lib/webdav.php b/apps/files_external/lib/webdav.php
index 6c268ea00b..c532c5eaa7 100644
--- a/apps/files_external/lib/webdav.php
+++ b/apps/files_external/lib/webdav.php
@@ -355,7 +355,7 @@ class DAV extends \OC\Files\Storage\Common {
 	 * @param string $path
 	 */
 	public function cleanPath($path) {
-		if ($path === ""){
+		if ($path === "") {
 			return $path;
 		}
 		$path = \OC\Files\Filesystem::normalizePath($path);
@@ -400,6 +400,22 @@ class DAV extends \OC\Files\Storage\Common {
 		}
 	}
 
+	public function isUpdatable($path) {
+		return (bool)($this->getPermissions($path) & \OCP\PERMISSION_UPDATE);
+	}
+
+	public function isCreatable($path) {
+		return (bool)($this->getPermissions($path) & \OCP\PERMISSION_CREATE);
+	}
+
+	public function isSharable($path) {
+		return (bool)($this->getPermissions($path) & \OCP\PERMISSION_SHARE);
+	}
+
+	public function isDeletable($path) {
+		return (bool)($this->getPermissions($path) & \OCP\PERMISSION_DELETE);
+	}
+
 	public function getPermissions($path) {
 		$this->init();
 		$response = $this->client->propfind($this->encodePath($path), array('{http://owncloud.org/ns}permissions'));
@@ -419,8 +435,12 @@ class DAV extends \OC\Files\Storage\Common {
 				$permissions |= \OCP\PERMISSION_CREATE;
 			}
 			return $permissions;
+		} else if ($this->is_dir($path)) {
+			return \OCP\PERMISSION_ALL;
+		} else if ($this->file_exists($path)) {
+			return \OCP\PERMISSION_ALL - \OCP\PERMISSION_CREATE;
 		} else {
-			return parent::getPermissions($path);
+			return 0;
 		}
 	}
 }