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cache.class.php
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cache.class.php
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<?php
/**
* RoadRunner v1.5.1
* This cache class will compress the contents and save them.
* It will also make a GZip version and save that too.
* It will then display the right version depending on if the
* browser supports it.
*
* @author Matthew Burns http://mattandceri.info
* @copyright 2014
*/
class RoadRunner{
/**
* Set everything up
* @return void
*/
public function __construct() {
header("Cache-Control: private, max-age=31536000");
header("X-Powered-By: RoadRunner Cache Class v1.5.1");
// Check to see if the client is requesting a new copy
$this->ifMod = (isset($_SERVER['HTTP_IF_MODIFIED_SINCE']) ?
strtotime($_SERVER['HTTP_IF_MODIFIED_SINCE']) :
0);
// Check to see if the client supports gzip
$this->supportsGzip = (isset($_SERVER['HTTP_ACCEPT_ENCODING']) ?
strpos( $_SERVER['HTTP_ACCEPT_ENCODING'], 'gzip' ) !== false :
0);
$this->output = '';
$this->compressedOutput = '';
}
/**
* Cleans up the used vars
* @return void
*/
public function __destruct() {
unset(
$this->ifMod,
$this->supportsGzip,
$this->output,
$this->compressedOutput
);
}
/**
* Checks the cache to see if it should be updated
* will also send a 304 if fine
* @param array $files name of the files
* @param string $file name of the compressed file
* @return bool
*/
public function checkCache(array $files,$comp) {
// Get a few vars setup
$compmtime = (file_exists($comp) ? filemtime($comp) : 0);
$updateCache = 0;
// See if any of the files have a newer mod time
// var $files has to be an array()
foreach ($files as $file) {
if(file_exists($file)){
$filesmtime[][$file] = filemtime($file);
}
}
foreach ($filesmtime as $key => $file) {
foreach ($file as $key2 => $value) {
$mtime = filemtime($key2);
if(($mtime-$compmtime)>0){
$updateCache = 1;
break;
}
}
}
// need to check ifMod and if $comp exsists
// also check if files have newer mod time
// send 304 if old files
if ($this->ifMod == $compmtime && file_exists($comp) && $updateCache==0) {
$this->send304($compmtime);
}
// client has requested new data or $comp doesnt exsist or cache out of date
// let the script calling this class decide how to update the cache
if (!file_exists($comp) || $updateCache==1) {
return 1;
}
//client has requested new data and $comp does exsist and cache is in date
if (file_exists($comp) && $updateCache==0) {
$this->loadCache($comp);
$this->loadCompressGz($comp.'.gz');
//return the results to the browser
$this->expiresHeaders($compmtime);
echo $this->finalOutput();
return 0;
}
}
/**
* Determins the output that should be used
* will use gzip if the client accepts it
* @return string
*/
public function finalOutput() {
if($this->supportsGzip){
$this->sendGzip();
return $this->compressedOutput;
} else {
return $this->output;
}
}
/**
* Compresses a html page
* Turned the colon removal off by default as it might be in normal text
* @param string $buffer data to fix
* @param string $type type of compression
* @return string
*/
public function compressPage($buffer,$type='half') {
// Remove comments (mostly CSS comments)
$buffer = preg_replace('!/\*[^*]*\*+([^/][^*]*\*+)*/!', '', $buffer);
// Remove HTML Comments
$buffer = preg_replace('/<!--(.*)-->/Uis', '', $buffer);
if ($type=='full') {
// Remove space after colons
$buffer = str_replace(': ', ':', $buffer);
}
// Remove whitespace
$buffer = str_replace(array("\r\n", "\r", "\n", "\t", ' ', ' ', ' '), '', $buffer);
// Save for later
$this->output = $buffer;
return $buffer;
}
/**
* Compresses JavaScript
* Uses the JShrink package by Robert Hafner <tedivm@tedivm.com>
* url: https://github.com/tedious/JShrink
* note: don't compress already minified source
* eg. JQuery, JQueryUI, etc.
* @param string $raw data to compress
* @return string
*/
public function compressJs($raw) {
require_once('min/jshrink.php');
$compressed = \JShrink\Minifier::minify($raw,array('flaggedComments' => false));
// Remove whitespace
$compressed = str_replace(array("\r\n", "\r", "\n", "\t", ' ', ' ', ' '), '', $compressed);
// Save for later
$this->output = $compressed;
return $compressed;
}
/**
* Makes the GZip file of the already compressed file
* @param string $data data to save
* @param string $file name of the file
* @return string
*/
public function compressGz($data,$file) {
$contents = gzencode(trim(preg_replace( '/\s+/', ' ', $data)),9);
// save the result
$fp = fopen($file, 'w');
fwrite($fp, $contents);
fclose($fp);
$this->compressedOutput = $contents;
return $contents;
}
/**
* Appends the CSS to the HTML string using the key
* @param string $fileCss name of the file
* @param string $contents html to append to
* @return string
*/
public function appendCss($fileCss,$contents) {
//Grab the css
$fp = fopen($fileCss, 'r');
$css = fread($fp, filesize($fileCss));
fclose($fp);
//Compress the CSS with colons
$css = $this->compressPage($css,'full');
return preg_replace('#%XXX%#', $css, $contents);
}
/**
* Loads the GZip version of the compressed file
* @param string $file name of the file
* @return void
*/
public function loadCompressGz($file) {
if(file_exists($file)){
// Load the compressed cache from the file
$fp = fopen($file, 'r');
$contents = fread($fp, filesize($file));
fclose($fp);
$this->compressedOutput = $contents;
return;
} else {
// check if the output has already been minified
if (empty($this->output)) {
// if not grab the minfied save file
$output2 = $this->loadCache(substr($file,0,-3));
$contents = $this->compressGz($output2,$file);
return;
}else{
// Output has the minified source
$data = $this->output;
$contents = $this->compressGz($data,$file);
return;
}
}
}
/**
* Saves out the compressed file
* @param string $file name of the file
* @param string $data data to save
* @return void
*/
public function updateCache($file,$data) {
//Save out the cached copy
$fp = fopen($file,'w');
fwrite($fp,$data);
fclose($fp);
}
/**
* Loads the minified file
* returns string if sucessful
* @param string $file name of the file
* @return string|void return the contents of the file
*/
public function loadCache($file) {
// Load the cache from file
if(file_exists($file)){
$fp = fopen($file,'r');
$cache = fread($fp,filesize($file));
fclose($fp);
// Echo out the result
$this->output = $cache;
return $cache;
} else {
return;
}
}
/**
* Opens the raw, uncompressed source file
* @param string $file name of the file
* @return string
*/
public function openUncompressed($file) {
$fp = fopen($file,'r');
$contents = fread($fp, filesize($file));
fclose($fp);
return $contents;
}
/**
* Easy way to send a 304 header
* @param string $time unix time to send to the client
* @return void
*/
public function send304($time) {
header('HTTP/1.1 304 Not Modified');
header("Expires: ".gmdate('D, d M Y H:i:s \G\M\T', time() + (3600 * 24 * 365)));
header("Last-Modified: ".gmdate('D, d M Y H:i:s \G\M\T', $time));
// This will be all the content we send
exit;
}
/**
* Specify that the content sent will be GZip
* @return void
*/
public function sendGzip() {
header("Content-Encoding: gzip");
}
/**
* Sends the expires headers
* @param string $time unix time to send to the client
* @return void
*/
public function expiresHeaders($time=0) {
// Cache for a year
header("Expires: ".gmdate('D, d M Y H:i:s \G\M\T', time() + (3600 * 24 * 365)));
// Send Last-Modified as right now for a brand new file
// or when the compressed file was last generated
if($time==0){
header("Last-Modified: ".gmdate('D, d M Y H:i:s \G\M\T', time()));
} else {
header("Last-Modified: ".gmdate('D, d M Y H:i:s \G\M\T', $time));
}
}
}
?>