Gazelle/sections/tools/managers/recommend_add.php

<?
//******************************************************************************//
//--------------- Add a recommendation -----------------------------------------//
authorize();

if (!check_perms('site_recommend_own') && !check_perms('site_manage_recommendations')) {
	error(403);
}

$URL = trim($_POST['url']);

// Make sure the URL they entered is on our site, and is a link to a torrent
$URLRegex = '/^https?:\/\/(www\.|ssl\.)?'.NONSSL_SITE_URL.'\/torrents\.php\?id=([0-9]+)$/i';
$Val->SetFields('url',
			'1','regex','The URL must be a link to a torrent on the site.',array('regex'=>$URLRegex));
$Err = $Val->ValidateForm($_POST); // Validate the form

if ($Err) { // if something didn't validate
	error($Err);
	header('Location: '.$_SERVER['HTTP_REFERER']);
	exit;
}

// Get torrent ID
$URLRegex = '/torrents\.php\?id=([0-9]+)$/i';
preg_match($URLRegex, $URL, $Matches);
$GroupID = $Matches[1];

if (empty($GroupID) || !is_number($GroupID)) {
	 error(404);
}

$DB->query("INSERT INTO torrents_recommended (GroupID, UserID, Time) VALUES ('".db_string($GroupID)."', $LoggedUser[ID], '".sqltime()."')");
Torrents::freeleech_groups($GroupID, 2, 3);

$Cache->delete_value('recommend');
header('Location: '.$_SERVER['HTTP_REFERER']);
?>