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<?php
/*
* First authored by Brian Cray
* License: http://creativecommons.org/licenses/by/3.0/
* Contact the author at http://briancray.com/
*/

ini_set('display_errors', 0);

if(!preg_match('|^[0-9a-zA-Z]{1,6}$|', $_GET['url']))
{
die('That is not a valid short url');
}

require('config.php');

$shortened_id = getIDFromShortenedURL($_GET['url']);

if(CACHE)
{
$long_url = file_get_contents(CACHE_DIR . $shortened_id);
if(empty($long_url) || !preg_match('|^https?://|', $long_url))
{
$long_url = mysql_result(mysql_query('SELECT long_url FROM ' . DB_TABLE . ' WHERE id="' . mysql_real_escape_string($shortened_id) . '"'), 0, 0);
@mkdir(CACHE_DIR, 0777);
$handle = fopen(CACHE_DIR . $shortened_id, 'w+');
fwrite($handle, $long_url);
fclose($handle);
}
}
else
{
$long_url = mysql_result(mysql_query('SELECT long_url FROM ' . DB_TABLE . ' WHERE id="' . mysql_real_escape_string($shortened_id) . '"'), 0, 0);
}

if(TRACK)
{
mysql_query('UPDATE ' . DB_TABLE . ' SET referrals=referrals+1 WHERE id="' . mysql_real_escape_string($shortened_id) . '"');
}

header('HTTP/1.1 301 Moved Permanently');
header('Location: ' . $long_url);
exit;

function getIDFromShortenedURL ($string, $base = ALLOWED_CHARS)
{
$length = strlen($base);
$size = strlen($string) - 1;
$string = str_split($string);
$out = strpos($base, array_pop($string));
foreach($string as $i => $char)
{
$out += strpos($base, $char) * pow($length, $size - $i);
}
return $out;
}
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