download.js

download.js

// download.js --- download a file from internet

//===========================================
// TODO: Please specify the URL and filename:

var url = "https://www.google.com/robots.txt"
var filename = "robots.txt"

// TODO: OK, save and open this file. Done.
//===========================================

function CreateHttpRequest() {
  var ids = new Array(
    "WinHttp.WinHttpRequest.5.1",
    "WinHttp.WinHttpRequest.5",
    "WinHttp.WinHttpRequest",
    "Msxml2.ServerXMLHTTP.6.0",
    "Msxml2.ServerXMLHTTP.5.0",
    "Msxml2.ServerXMLHTTP.4.0",
    "Msxml2.ServerXMLHTTP.3.0",
    "Msxml2.ServerXMLHTTP",
    "Microsoft.ServerXMLHTTP",
    "Msxml2.XMLHTTP.6.0",
    "Msxml2.XMLHTTP.5.0",
    "Msxml2.XMLHTTP.4.0",
    "Msxml2.XMLHTTP.3.0",
    "Msxml2.XMLHTTP",
    "Microsoft.XMLHTTP");

  for (var i = 0; i < ids.length; ++i) {
    var obj = new ActiveXObject(ids[i]);
    if (obj) return obj;
  }
  return null;
}

function DoDownload(Url, Path) {
  var req = CreateHttpRequest();
  if (!req) {
    WScript.Echo("ERROR: Can't create an HTTP object!");
    return;
  }
  req.Open("GET", Url, false);
  req.setRequestHeader("Pragma", "no-cache");
  req.setRequestHeader("Cache-Control", "no-cache");
  req.setRequestHeader("If-Modified-Since", "Thu, 01 Jun 1970 00:00:00 GMT");
  req.Send();

  switch (req.Status) {
  case 200:
    var stream = new ActiveXObject("ADODB.Stream");
    stream.Type = 1;
    stream.Open();
    stream.Write(req.responseBody);
    stream.SaveToFile(Path, 2);
    stream.Close();
    WScript.Echo("OK, downloaded!");
    break;
  default:
    WScript.Echo("ERROR: Code " + req.Status);
  }
}

DoDownload(url, filename);