<?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;

}