183 lines
4.3 KiB
PHP
183 lines
4.3 KiB
PHP
<?php
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/**
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* Easy Min
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*
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* Simple minification for better website performance
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*
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* @author Timothy J. Warren
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* @copyright Copyright (c) 2012
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* @link https://github.com/aviat4ion/Easy-Min
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* @license http://philsturgeon.co.uk/code/dbad-license
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*/
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// --------------------------------------------------------------------------
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//Get config files
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require('./config/config.php');
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//Include the js groups
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$groups_file = "./config/js_groups.php";
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$groups = require($groups_file);
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//The name of this file
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$this_file = basename(__FILE__);
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// --------------------------------------------------------------------------
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/**
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* Get Files
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*
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* Concatenates the javascript files for the current
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* group as a string
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* @return string
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*/
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function get_files()
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{
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global $groups, $js_root;
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$js = '';
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foreach($groups[$_GET['g']] as $file)
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{
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$new_file = realpath($js_root.$file);
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$js .= file_get_contents($new_file);
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}
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return $js;
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}
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// --------------------------------------------------------------------------
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/**
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* Google Min
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*
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* Minifies javascript using google's closure compiler
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* @param string $new_file
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* @return string
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*/
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function google_min($new_file)
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{
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//Get a much-minified version from Google's closure compiler
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$ch = curl_init('http://closure-compiler.appspot.com/compile');
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curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
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curl_setopt($ch, CURLOPT_POST, 1);
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curl_setopt($ch, CURLOPT_POSTFIELDS, 'output_info=compiled_code&output_format=text&compilation_level=SIMPLE_OPTIMIZATIONS&js_code=' . urlencode($new_file));
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$output = curl_exec($ch);
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curl_close($ch);
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return $output;
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}
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// --------------------------------------------------------------------------
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//Creative rewriting of /g/groupname to ?g=groupname
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$pi = $_SERVER['PATH_INFO'];
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$pia = explode('/', $pi);
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$pia_len = count($pia);
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$i = 1;
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while($i < $pia_len)
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{
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$j = $i+1;
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$j = (isset($pia[$j])) ? $j : $i;
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$_GET[$pia[$i]] = $pia[$j];
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$i = $j + 1;
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};
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// --------------------------------------------------------------------------
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$js = '';
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$modified = array();
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// --------------------------------------------------------------------------
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//Aggregate the last modified times of the files
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if(isset($groups[$_GET['g']]))
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{
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$cache_file = $js_root.'cache/'.$_GET['g'];
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foreach($groups[$_GET['g']] as $file)
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{
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$new_file = realpath($js_root.$file);
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$modified[] = filemtime($new_file);
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}
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//Add this page too, as well as the groups file
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$modified[] = filemtime($this_file);
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$modified[] = filemtime($groups_file);
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$cache_modified = 0;
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//Add the cache file
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if(is_file($cache_file))
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{
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$cache_modified = filemtime($cache_file);
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}
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}
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else //Nothing to display? Just exit
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{
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die("You must specify a group that exists");
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}
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// --------------------------------------------------------------------------
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//Get the latest modified date
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rsort($modified);
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$last_modified = $modified[0];
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$requested_time=(isset($_SERVER['HTTP_IF_MODIFIED_SINCE']))
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? strtotime($_SERVER['HTTP_IF_MODIFIED_SINCE'])
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: time();
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// If the browser's cached version is up to date,
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// don't resend the file
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if($last_modified === $requested_time)
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{
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header("HTTP/1.1 304 Not Modified");
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exit();
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}
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// --------------------------------------------------------------------------
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//Determine what to do: rebuild cache, send files as is, or send cache.
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if($cache_modified < $last_modified)
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{
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$js = google_min(get_files());
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$cs = file_put_contents($cache_file, $js);
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//Make sure cache file gets created/updated
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if($cs === FALSE)
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{
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die("Cache file was not created. Make sure you have the correct folder permissions.");
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}
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}
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// If debug is set, just concatenate
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else if(isset($_GET['debug']))
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{
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$js = get_files();
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}
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// Otherwise, send the cached file
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else
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{
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$js = file_get_contents($cache_file);
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}
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// --------------------------------------------------------------------------
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//This GZIPs the js for transmission to the user
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//making file size smaller and transfer rate quicker
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ob_start("ob_gzhandler");
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// Set important caching headers
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header("Content-Type: application/javascript; charset=utf8");
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header("Cache-control: public, max-age=691200, must-revalidate");
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header("Last-Modified: ".gmdate('D, d M Y H:i:s', $last_modified)." GMT");
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header("Expires: ".gmdate('D, d M Y H:i:s', (filemtime($this_file) + 691200))." GMT");
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echo $js;
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ob_end_flush();
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//end of js.php
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