includes/clientside/jsres.php
author Dan Fuhry <dan@enanocms.org>
Thu, 28 Oct 2010 03:05:31 -0400
changeset 1308 f9bee9b125ee
parent 1295 3c9c1b18567b
permissions -rw-r--r--
Parser updates. Added the "styled" keyword to wikitables to allow them to be styled using the current theme's standard table skinning, and changes to how the image tag parser decides how to display an image (framed, inline or raw).

<?php

/*
 * Enano - an open-source CMS capable of wiki functions, Drupal-like sidebar blocks, and everything in between
 * Copyright (C) 2006-2009 Dan Fuhry
 * jsres.php - the Enano client-side runtime, a.k.a. AJAX on steroids
 *
 * This program is Free Software; you can redistribute and/or modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied
 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for details.
 */

// define('ENANO_JS_DEBUG', 1);

// if Enano's already loaded, we've been included from a helper script
if ( defined('ENANO_CONFIG_FETCHED') )
	define('ENANO_JSRES_SETUP_ONLY', 1);

if ( !defined('ENANO_JSRES_SETUP_ONLY') ):

/**
 * Returns a floating-point number with the current UNIX timestamp in microseconds. Defined very early because we gotta call it
 * from very early on in the script to measure the starting time of Enano.
 * @return float
 */

// First check to see if something already declared this function.... it happens often.
if ( !function_exists('microtime_float') )
{
	function microtime_float()
	{
		list($usec, $sec) = explode(" ", microtime());
		return ((float)$usec + (float)$sec);
	}
}

$local_start = microtime_float();

// Disable for IE, it causes problems.
$disable_compress = ( strstr(@$_SERVER['HTTP_USER_AGENT'], 'MSIE') || defined('ENANO_JS_DEBUG') ) && !isset($_GET['early']);

// Setup Enano

//
// Determine the location of Enano as an absolute path.
//

// We need to see if this is a specially marked Enano development server. You can create an Enano
// development server using the script found on hg.enanocms.org.
if ( strpos(__FILE__, '/repo/') && ( file_exists('../../.enanodev') || file_exists('../../../.enanodev') ) )
{
	// We have a development directory. Remove /repo/ from the picture.
	$filename = str_replace('/repo/', '/', __FILE__);
}
else
{
	// Standard Enano installation
	$filename = __FILE__;
}

// ENANO_ROOT is sometimes defined by plugins like AjIM that need the constant before the Enano API is initialized
if ( !defined('ENANO_ROOT') )
	define('ENANO_ROOT', dirname(dirname(dirname($filename))));

chdir(ENANO_ROOT);

// fetch only the site config
define('ENANO_EXIT_AFTER_CONFIG', 1);
require('includes/common.php');

endif; // ENANO_JSRES_SETUP_ONLY

// CONFIG

// Files safe to run full (aggressive) compression on
$full_compress_safe = array(
	// Sorted by file size, descending (du -b *.js | sort -n)
	'crypto.js',
	'ajax.js',
	'editor.js',
	'functions.js',
	'login.js',
	'acl.js',
	'misc.js',
	'comments.js',
	'autofill.js',
	'dropdown.js',
	'paginate.js',
	'enano-lib-basic.js',
	'pwstrength.js',
	'flyin.js',
	'rank-manager.js',
	'userpage.js',
	'template-compiler.js',
	'toolbar.js',
	'upload.js'
);

// Files that should NOT be compressed due to already being compressed, licensing, or invalid produced code
$compress_unsafe = array('json.js', 'fat.js', 'admin-menu.js', 'autofill.js', 'jquery.js', 'jquery-ui.js');

require_once('includes/js-compressor.php');

// try to gzip the output
if ( !defined('ENANO_JSRES_SETUP_ONLY') ):
$do_gzip = true;

// Output format will always be JS
header('Content-type: text/javascript');

endif; // ENANO_JSRES_SETUP_ONLY

$everything = "/* The code represented in this file is compressed for optimization purposes. The full source code is available in includes/clientside/static/. */\n\nvar ENANO_JSRES_COMPRESSED = true;\n\n";

// if we only want the tiny version of the API (just enough to get by until the full one is loaded), send that
// with a simple ETag and far future expires header

// note - obfuscated for optimization purposes. The exact same code except properly indented is in enano-lib-basic.
if ( isset($_GET['early']) )
{
	header('ETag: enanocms-lib-early-r3');
	header('Expires: Wed, 1 Jan 2020 00:00:00 GMT');
	
	echo <<<JSEOF
window.loaded_components = window.loaded_components || {};
window.onload_complete = false;
var onload_hooks = new Array();function addOnloadHook(func){if ( typeof ( func ) == 'function' ){if ( typeof(onload_hooks.push) == 'function' ){onload_hooks.push(func);}else{onload_hooks[onload_hooks.length] = func;};};}
JSEOF;
	
	exit();
}

// Load and parse enano_lib_basic
$file = @file_get_contents('includes/clientside/static/enano-lib-basic.js');

$pos_start_includes = strpos($file, '/*!START_INCLUDER*/');
$pos_end_includes = strpos($file, '/*!END_INCLUDER*/');

if ( !$pos_start_includes || !$pos_end_includes )
{
	die('// Error: enano-lib-basic does not have required metacomments');
}

$pos_end_includes += strlen('/*!END_INCLUDER*/');

preg_match('/var thefiles = (\[([^\]]+?)\]);/', $file, $match);

if ( empty($match) )
	die('// Error: could not retrieve file list from enano-lib-basic');

// Decode file list
try
{
	$file_list = enano_json_decode($match[1]);
}
catch ( Exception $e )
{
	die("// Exception caught during file list parsing");
}

$apex = filemtime('includes/clientside/static/enano-lib-basic.js');

$before_includes = substr($file, 0, $pos_start_includes);
$after_includes = substr($file, $pos_end_includes);

if ( isset($_GET['f']) )
{
	// requested a single file
	$js_file =& $_GET['f'];
	if ( strstr($js_file, ',') )
	{
		$filelist = explode(',', $js_file);
		unset($js_file);
		$everything = '';
		foreach ( $filelist as $js_file )
		{
			if ( !preg_match('/^[a-z0-9_-]+\.js$/i', $js_file) )
			{
				header('HTTP/1.1 404 Not Found');
				exit('Not found');
			}
			
			$apex = filemtime("includes/clientside/static/$js_file");
			
			$file_contents = file_get_contents("includes/clientside/static/$js_file");
			$everything .= jsres_cache_check($js_file, $file_contents) . ' loaded_components[\'' . $js_file . '\'] = true;';
		}
		$everything .= 'if ( onload_complete ) { runOnloadHooks(); onload_hooks = []; };';
	}
	else
	{
		if ( !preg_match('/^[a-z0-9_-]+\.js$/i', $js_file) )
		{
			header('HTTP/1.1 404 Not Found');
			exit('Not found');
		}
		
		$apex = filemtime("includes/clientside/static/$js_file");
		
		$file_contents = file_get_contents("includes/clientside/static/$js_file");
		$everything = jsres_cache_check($js_file, $file_contents) . ' loaded_components[\'' . $js_file . '\'] = true; if ( onload_complete ) { runOnloadHooks(); onload_hooks = []; };';
	}
}
else
{
	// compress enano-lib-basic
	$libbasic = "$before_includes\n$after_includes";
	$libbasic = jsres_cache_check('enano-lib-basic.js', $libbasic);
	$everything .= $libbasic;
	
	// $everything .= $before_includes;
	// $everything .= $after_includes;
	
	foreach ( $file_list as $js_file )
	{
		$file_contents = file_get_contents("includes/clientside/static/$js_file");
		$time = filemtime("includes/clientside/static/$js_file");
		if ( $time > $apex )
			$apex = $time;
		
		$file_contents = jsres_cache_check($js_file, $file_contents);
		
		$everything .= "\n\n// $js_file\n";
		$everything .= "\n" . $file_contents;
	}
}

// generate ETag
$etag = base64_encode(hexdecode(sha1($everything)));

if ( isset($_SERVER['HTTP_IF_NONE_MATCH']) )
{
	if ( "\"$etag\"" == $_SERVER['HTTP_IF_NONE_MATCH'] )
	{
		header('HTTP/1.1 304 Not Modified');
		exit();
	}
}

// generate expires header
$expires = date('r', mktime(0, 0, 0, intval(date('m')), intval(date('d')), intval(date('y'))+1));

$everything = str_replace('/* JavaScriptCompressor 0.8 [www.devpro.it], thanks to Dean Edwards for idea [dean.edwards.name] */' . "\r\n", '', $everything);

$date = date('r', $apex);

if ( defined('ENANO_JSRES_SETUP_ONLY') )
{
	return; // we're done setting up, break out
}

header("Date: $date");
header("Last-Modified: $date");
header("ETag: \"$etag\"");
header("Expires: $expires");
if ( !$do_gzip )
	header("Content-Length: " . strlen($everything));

$local_end = microtime_float();
$local_gentime = $local_end - $local_start;
$local_gentime = round($local_gentime, 5);
header("X-Performance: generated in $local_gentime seconds");

if ( $do_gzip )
	ob_start();

echo $everything;

if ( $do_gzip )
{
	gzip_output();
}

/**
 * Check the cache for the given JS file and return the best-compressed version.
 * @param string Javascript file (acl.js)
 * @param string Default/current contents
 * @return string
 */

function jsres_cache_check($js_file, $file_contents)
{
	global $full_compress_safe, $compress_unsafe;
	global $disable_compress;
	
	if ( $disable_compress )
		return $file_contents;
	
	$file_md5 = md5($file_contents);
	
	// Is this file cached?
	$cache_path = ENANO_ROOT . "/cache/jsres_$js_file.json";
	$loaded_cache = false;
	
	if ( file_exists($cache_path) )
	{
		// Load the cache file and parse it.
		$cache_file = file_get_contents($cache_path);
		try
		{
			$cache_file = enano_json_decode($cache_file);
		}
		catch ( Exception $e )
		{
			// Don't do anything - let our fallbacks come into place
		}
		if ( is_array($cache_file) && isset($cache_file['md5']) && isset($cache_file['src']) )
		{
			if ( $cache_file['md5'] === $file_md5 )
			{
				@header("X-Cache-Status: cache HIT, hash $file_md5");
				$loaded_cache = true;
				$file_contents = $cache_file['src'];
			}
		}
	}
	if ( !$loaded_cache && getConfig('cache_thumbs') == '1' )
	{
		// Try to open the cache file and write to it. If we can't do that, just don't compress the code.
		$handle = @fopen($cache_path, 'w');
		if ( $handle )
		{
			$aggressive = in_array($js_file, $full_compress_safe);
			if ( !in_array($js_file, $compress_unsafe) )
				$file_contents = perform_js_compress($file_contents, $aggressive);
			
			$payload = enano_json_encode(array(
					'md5' => $file_md5,
					'src' => $file_contents
				));
			fwrite($handle, $payload);
			fclose($handle);
			@header("X-Cache-Status: cache MISS, new generated");
		}
		else
		{
			@header("X-Cache-Status: cache MISS, not generated");
		}
	}
	else if ( !$loaded_cache )
	{
		@header("X-Cache-Status: cache MISS, not generated");
	}
	
	return $file_contents;
}