safechat/html/login.php

<?php
try {
  require_once("usertable.php");
  $user = $db->real_escape_string($_REQUEST['user']);
  $pubkey = $db->real_escape_string($_REQUEST['pubkey']);
  $pgp = gnupg_init();
  if (!$pgp) error("pgp on server failed");
  $verify = gnupg_import($pgp, $_REQUEST['pubkey']);
  if (!$verify) error("wrong identity");
  $q = $db->query("select * from user where name='$user' and pubkey='$pubkey';");
  if ($q->num_rows==1) {
    success("user verified");
  } elseif ($q->num_rows==0) {
    $q = $db->query("insert into user (name, pubkey) values ('$user', '$pubkey');");
    if (!q) error("creation of user failed");
    success("user created");
  } else {
    error("server database defect");
  }
} catch (Exception $e) {
  echo json_encode(array('success' => false, 'txt' => "login failed"));
}
?>