<?php
define("MAIN_DIR", __dir__."/..");

function get_info($url)
{
  $ec = file(MAIN_DIR."/database",FILE_IGNORE_NEW_LINES|FILE_SKIP_EMPTY_LINES);
  $nbLign = count($ec);

  for ($i = 0; $i < $nbLign; $i++)
  {
    if ($ec[$i] == $url)
      break;
    else
    {
      while ($i < $nbLign && trim($ec[$i]) != "--")
        $i++;
    }
  }

  if ($i < $nbLign)
  {
    $filename = preg_replace("#^(.+)\.([a-zA-Z0-9]{1,4})$#", '\1.mp3', $ec[$i+3]);
    return array($ec[$i], $ec[$i+1], $ec[$i+2], $ec[$i+3], trim($filename));
  }
  else
    return NULL;
}

$user = "generic";
foreach ($_GET as $k => $t)
{
  if (empty($t))
  {
    $user = $k;
    break;
  }
}
if (!preg_match("#^[a-zA-Z0-9_]+$#", $user))
  die ("Le nom d'utilisateur contient des caractères interdits.");


if (isset($_GET["f"]))
{
  if (is_file(MAIN_DIR."/users/".$user.".dlist.done"))
  {
    $ec = file(MAIN_DIR."/users/".$user.".dlist.done",FILE_IGNORE_NEW_LINES|FILE_SKIP_EMPTY_LINES);

    foreach ($ec as $k => $lign)
    {
      if ($k == $_GET["f"])
      {
        $musik = get_info($lign);
        if (isset($musik) && is_file(MAIN_DIR."/content/".$musik[4]))
        {
          $filename = MAIN_DIR."/content/".$musik[4];

          header('Content-Description: File Transfer');
          header('Content-Type: application/octet-stream');
          header("Content-Disposition: attachment; filename=\"".$musik[1].".mp3\"");
          header('Content-Transfer-Encoding: binary');
          header('Expires: 0');
          header('Cache-Control: must-revalidate, post-check=0, pre-check=0');
          header('Pragma: public');
          header('Content-Length: ' . filesize($filename));
          readfile($filename);
          exit;
        }
      }
    }
  }
}
die ("Fichier introuvable");
?>