nexusphp/public/takeinvite.php

<?php
require_once("../include/bittorrent.php");
dbconn();
require_once(get_langfile_path());
registration_check('invitesystem', true, false);
if (get_user_class() < $sendinvite_class)
stderr($lang_takeinvite['std_error'],$lang_takeinvite['std_invite_denied']);
if ($CURUSER['invites'] < 1)
	stderr($lang_takeinvite['std_error'],$lang_takeinvite['std_no_invite']);
function bark($msg) {
  stdhead();
	stdmsg($lang_takeinvite['head_invitation_failed'], $msg);
  stdfoot();
  exit;
}

$id = $CURUSER['id'];
$email = unesc(htmlspecialchars(trim($_POST["email"])));
$email = safe_email($email);
if (!$email)
    bark($lang_takeinvite['std_must_enter_email']);
if (!check_email($email))
	bark($lang_takeinvite['std_invalid_email_address']);
if(EmailBanned($email))
    bark($lang_takeinvite['std_email_address_banned']);

if(!EmailAllowed($email))
    bark($lang_takeinvite['std_wrong_email_address_domains'].allowedemails());

$body = str_replace("<br />", "<br />", nl2br(trim(strip_tags($_POST["body"]))));
if(!$body)
	bark($lang_takeinvite['std_must_enter_personal_message']);


// check if email addy is already in use
$a = (@mysql_fetch_row(@sql_query("select count(*) from users where email=".sqlesc($email))));
if ($a[0] != 0)
  bark($lang_takeinvite['std_email_address'].htmlspecialchars($email).$lang_takeinvite['std_is_in_use']);
$b = (@mysql_fetch_row(@sql_query("select count(*) from invites where invitee=".sqlesc($email))));
if ($b[0] != 0)
  bark($lang_takeinvite['std_invitation_already_sent_to'].htmlspecialchars($email).$lang_takeinvite['std_await_user_registeration']);

$ret = sql_query("SELECT username FROM users WHERE id = ".sqlesc($id)) or sqlerr();
$arr = mysql_fetch_assoc($ret);

$hash  = md5(mt_rand(1,10000).$CURUSER['username'].TIMENOW.$CURUSER['passhash']);

$title = $SITENAME.$lang_takeinvite['mail_tilte'];

sql_query("INSERT INTO invites (inviter, invitee, hash, time_invited) VALUES ('".mysql_real_escape_string($id)."', '".mysql_real_escape_string($email)."', '".mysql_real_escape_string($hash)."', " . sqlesc(date("Y-m-d H:i:s")) . ")");
sql_query("UPDATE users SET invites = invites - 1 WHERE id = ".mysql_real_escape_string($id)) or sqlerr(__FILE__, __LINE__);
$signupUrl = getSchemeAndHttpHost() . "/signup.php?type=invite&invitenumber=$hash";
$message = <<<EOD
{$lang_takeinvite['mail_one']}{$arr['username']}{$lang_takeinvite['mail_two']}
<b><a href="javascript:void(null)" onclick="window.open($signupUrl)">{$lang_takeinvite['mail_here']}</a></b><br />
$signupUrl
<br />{$lang_takeinvite['mail_three']}$invite_timeout{$lang_takeinvite['mail_four']}{$arr['username']}{$lang_takeinvite['mail_five']}<br />
$body
<br /><br />{$lang_takeinvite['mail_six']}
EOD;

sent_mail($email,$SITENAME,$SITEEMAIL,$title,$message,"invitesignup",false,false,'');
//this email is sent only when someone give out an invitation

header("Refresh: 0; url=invite.php?id=".htmlspecialchars($id)."&sent=1");
?>