Easy-Min/js.php

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<?php
2012-04-26 10:11:15 -04:00
/**
* Easy Min
*
* Simple minification for better website performance
*
* @author Timothy J. Warren
* @copyright Copyright (c) 2012-2016
* @link https://git.timshomepage.net/aviat4ion/Easy-Min
2012-04-26 10:11:15 -04:00
* @license http://philsturgeon.co.uk/code/dbad-license
*/
// --------------------------------------------------------------------------
namespace Aviat\EasyMin;
use GuzzleHttp\Client;
use GuzzleHttp\Psr7\Request;
// Include guzzle
require_once('../vendor/autoload.php');
require_once('./min.php');
/**
* Simple Javascript minfier, using google closure compiler
*/
class JSMin extends BaseMin {
protected $js_root;
protected $js_group;
protected $js_groups_file;
protected $cache_file;
protected $last_modified;
protected $requested_time;
protected $cache_modified;
public function __construct(array $config, array $groups)
{
$group = $_GET['g'];
$this->js_root = $config['js_root'];
$this->js_group = $groups[$group];
$this->js_groups_file = $config['js_groups_file'];
$this->cache_file = "{$this->js_root}cache/{$group}";
$this->last_modified = $this->get_last_modified();
$this->cache_modified = (is_file($this->cache_file))
? filemtime($this->cache_file)
: 0;
// Output some JS!
$this->send();
}
protected function send()
{
// Override caching if debug key is set
if($this->is_debug_call())
{
return $this->output($this->get_files());
}
// If the browser's cached version is up to date,
// don't resend the file
if($this->last_modified == $this->get_if_modified() && $this->is_not_debug())
{
throw new FileNotChangedException();
}
if($this->cache_modified < $this->last_modified)
{
$js = $this->minify($this->get_files());
//Make sure cache file gets created/updated
if (file_put_contents($this->cache_file, $js) === FALSE)
{
echo 'Cache file was not created. Make sure you have the correct folder permissions.';
return;
}
return $this->output($js);
}
else
{
return $this->output(file_get_contents($this->cache_file));
}
}
/**
* Makes a call to google closure compiler service
*
* @param array $options - Form parameters
* @return object
*/
protected function closure_call(array $options)
{
$client = new Client();
$response = $client->post('http://closure-compiler.appspot.com/compile', [
'headers' => [
'Accept-Encoding' => 'gzip',
'Content-type' => 'application/x-www-form-urlencoded'
],
'form_params' => $options
]);
return $response;
}
/**
* Do a call to the closure compiler to check for compilation errors
*
* @param array $options
* @return void
*/
protected function check_minify_errors($options)
{
$error_res = $this->closure_call($options);
$error_json = $error_res->getBody();
$error_obj = json_decode($error_json) ?: (object)[];
// Show error if exists
if ( ! empty($error_obj->errors) || ! empty($error_obj->serverErrors))
{
$error_json = json_encode($error_obj, JSON_PRETTY_PRINT);
header('Content-type: application/javascript');
echo "console.error(${error_json});";
die();
}
}
/**
* Get Files
*
* Concatenates the javascript files for the current
* group as a string
*
* @return string
*/
protected function get_files()
{
$js = '';
foreach($this->js_group as $file)
{
$new_file = realpath("{$this->js_root}{$file}");
$js .= file_get_contents($new_file) . "\n\n";
}
return $js;
}
/**
* Get the most recent modified date
*
* @return int
*/
protected function get_last_modified()
{
$modified = array();
foreach($this->js_group as $file)
{
$new_file = realpath("{$this->js_root}{$file}");
$modified[] = filemtime($new_file);
}
//Add this page too, as well as the groups file
$modified[] = filemtime(__FILE__);
$modified[] = filemtime($this->js_groups_file);
rsort($modified);
$last_modified = $modified[0];
return $last_modified;
}
/**
* Minifies javascript using google's closure compiler
*
* @param string $js
* @return string
*/
protected function minify($js)
{
$options = [
'output_info' => 'errors',
'output_format' => 'json',
'compilation_level' => 'SIMPLE_OPTIMIZATIONS',
//'compilation_level' => 'ADVANCED_OPTIMIZATIONS',
'js_code' => $js,
'language' => 'ECMASCRIPT6_STRICT',
'language_out' => 'ECMASCRIPT5_STRICT'
];
// Check for errors
$this->check_minify_errors($options);
// Now actually retrieve the compiled code
$options['output_info'] = 'compiled_code';
$res = $this->closure_call($options);
$json = $res->getBody();
$obj = json_decode($json);
return $obj->compiledCode;
}
/**
* Output the minified javascript
*
* @param string $js
* @return void
*/
protected function output($js)
{
$this->send_final_output($js, 'application/javascript', $this->last_modified);
}
}
// --------------------------------------------------------------------------
// ! Start Minifying
// --------------------------------------------------------------------------
$config = require_once('config/config.php');
$groups = require_once($config['js_groups_file']);
$cache_dir = "{$config['js_root']}cache";
if ( ! is_dir($cache_dir))
{
mkdir($cache_dir);
}
if ( ! array_key_exists($_GET['g'], $groups))
{
throw new InvalidArgumentException('You must specify a js group that exists');
}
try
{
new JSMin($config, $groups);
}
catch (FileNotChangedException $e)
{
BaseMin::send304();
}
//end of js.php