Expose creatable permissions trough fileinfo

lib/private/files/fileinfo.php

@@ -183,6 +183,15 @@ class FileInfo implements \OCP\Files\FileInfo, \ArrayAccess {
 		return $this->checkPermissions(\OCP\PERMISSION_UPDATE);
 	}
 
+	/**
+	 * Check whether new files or folders can be created inside this folder
+	 *
+	 * @return bool
+	 */
+	public function isCreatable() {
+		return $this->checkPermissions(\OCP\PERMISSION_CREATE);
+	}
+
 	/**
 	 * @return bool
 	 */

lib/public/files/fileinfo.php

@@ -135,6 +135,13 @@ interface FileInfo {
 	 */
 	public function isUpdateable();
 
+	/**
+	 * Check whether new files or folders can be created inside this folder
+	 *
+	 * @return bool
+	 */
+	public function isCreatable();
+
 	/**
 	 * Check if a file or folder can be deleted
 	 *