Added directory tree backend

backend/dir_tree.php

+<?php
+
+header("Access-Control-Allow-Origin: *");
+header('Access-Control-Allow-Credentials: true');
+header("Access-Control-Allow-Methods: PUT, GET, POST, DELETE");
+header("Access-Control-Allow-Headers: Origin, X-Requested-With, Content-Type, Accept");
+header("Content-Type: application/json; charset=UTF-8");
+
+$postData = file_get_contents("php://input");
+$postData = json_decode($postData, true);
+
+$uname = $postData['username'];
+
+function dirToArray($dir) 
+{
+  
+  $result = array();
+  $result["dirs"] = array();
+  $result["files"] = array();
+
+  $cdir = scandir($dir);
+  foreach ($cdir as $key => $value)
+  {
+     if (!in_array($value,array(".","..")))
+     {
+        if (is_dir($dir . DIRECTORY_SEPARATOR . $value))
+        {
+           $result["dirs"][$value] = dirToArray($dir . DIRECTORY_SEPARATOR . $value);
+        }
+        else
+        {
+           array_push($result["files"], $value);
+        }
+     }
+  }
+ 
+  return $result;
+}
+
+$Dir = "../users/" . $uname;
+
+echo json_encode(dirToArray($Dir));
+
+?>
\ No newline at end of file