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<?php
/**
* This file compresses the javascript files using GZip
*
* Todo:
* - Add local file cache for the GZip:ed version.
*/
if(is_int(strpos($_SERVER['REQUEST_URI'], '__nocache')))
$expiresOffset = -10000; //no cache
else
$expiresOffset = 3600 * 24 * 10; // 10 days util client cache expires
//allowed libraries
$library = array('prado', 'effects', 'ajax', 'validator', 'logger', 'datepicker', 'rico');
$param = isset($_GET['js']) ? $_GET['js'] : '';
//check for proper matching parameters, otherwise exit;
if(preg_match('/(\w)+(,\w+)*/', $param)) $js = explode(',', $param); else exit();
foreach($js as $lib) if(!in_array($lib, $library)) exit();
// Only gzip the contents if clients and server support it
if (isset($_SERVER['HTTP_ACCEPT_ENCODING']))
$encodings = explode(',', strtolower($_SERVER['HTTP_ACCEPT_ENCODING']));
else
$encodings = array();
// Check for gzip header or northon internet securities
if ((in_array('gzip', $encodings) || isset($_SERVER['---------------']))
&& function_exists('ob_gzhandler') && !ini_get('zlib.output_compression'))
ob_start("ob_gzhandler");
// Output rest of headers
header('Content-type: text/javascript; charset: UTF-8');
// header("Cache-Control: must-revalidate");
header('Vary: Accept-Encoding'); // Handle proxies
header('Expires: ' . @gmdate('D, d M Y H:i:s', @time() + $expiresOffset) . ' GMT');
foreach($js as $lib)
{
$file = realpath($lib.'.js');
if(is_file($file))
echo file_get_contents($file);
else //log missings files to console logger
{
echo 'setTimeout(function(){ if(Logger) Logger.error("Missing file", "'.$lib.'.js"); }, 1000);';
error_log("Unable to find asset file {$lib}.js");
}
}
?>
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