includes/clientside/jsres.php
author Dan
Wed, 07 May 2008 14:05:31 -0400
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Added ETag on TinyMCE gzip; changed ETag format for standard pages so as to include user and login info to control caching when logged in or out
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<?php
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/*
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 * Enano - an open-source CMS capable of wiki functions, Drupal-like sidebar blocks, and everything in between
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 * Version 1.1.4 (Caoineag alpha 4)
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 * Copyright (C) 2006-2008 Dan Fuhry
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 * jsres.php - the Enano client-side runtime, a.k.a. AJAX on steroids
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 *
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 * This program is Free Software; you can redistribute and/or modify it under the terms of the GNU General Public License
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 * as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.
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 *
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 * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied
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 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for details.
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 */
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// Disable for IE, it causes problems.
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if ( strstr(@$_SERVER['HTTP_USER_AGENT'], 'MSIE') )
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{
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  header('HTTP/1.1 302 Redirect');
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  header('Location: static/enano-lib-basic.js');
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  exit();
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}
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// Setup Enano
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//
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// Determine the location of Enano as an absolute path.
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//
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// We need to see if this is a specially marked Enano development server. You can create an Enano
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// development server by cloning the Mercurial repository into a directory named repo, and then
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// using symlinks to reference the original files so as to segregate unique files from non-unique
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// and distribution-standard ones. Enano will pivot its root directory accordingly if the file
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// .enanodev is found in the Enano root (not /repo/).
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if ( strpos(__FILE__, '/repo/') && ( file_exists('../../.enanodev') || file_exists('../../../.enanodev') ) )
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{
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  // We have a development directory. Remove /repo/ from the picture.
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  $filename = str_replace('/repo/', '/', __FILE__);
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}
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else
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{
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  // Standard Enano installation
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  $filename = __FILE__;
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}
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// ENANO_ROOT is sometimes defined by plugins like AjIM that need the constant before the Enano API is initialized
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if ( !defined('ENANO_ROOT') )
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  define('ENANO_ROOT', dirname(dirname(dirname($filename))));
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chdir(ENANO_ROOT);
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// CONFIG
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// Files safe to run full (aggressive) compression on
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$full_compress_safe = array(
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  // Sorted by file size, descending (du -b *.js | sort -n)
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  'libbigint.js',
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  'ajax.js',
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  'editor.js',
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  'acl.js',
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  'misc.js',
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  'comments.js',
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  'rijndael.js',
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  'autofill.js',
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  'dropdown.js',
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  'paginate.js',
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  'autocomplete.js',
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  'md5.js',
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  'pwstrength.js',
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  'sha256.js',
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  'flyin.js',
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  'template-compiler.js',
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  'toolbar.js',
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  'diffiehellman.js',
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  'enanomath.js'
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);
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// Files that should NOT be compressed due to already being compressed, licensing, or invalid produced code
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$compress_unsafe = array('SpryEffects.js', 'json.js', 'fat.js', 'admin-menu.js');
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require('includes/functions.php');
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require('includes/json2.php');
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require('includes/js-compressor.php');
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// try to gzip the output
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$do_gzip = false;
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if ( isset($_SERVER['HTTP_ACCEPT_ENCODING']) )
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{
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  $acceptenc = str_replace(' ', '', strtolower($_SERVER['HTTP_ACCEPT_ENCODING']));
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  $acceptenc = explode(',', $acceptenc);
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  if ( in_array('gzip', $acceptenc) )
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  {
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    $do_gzip = true;
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    ob_start();
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  }
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}
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// Output format will always be JS
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header('Content-type: text/javascript');
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$everything = '';
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// Load and parse enano_lib_basic
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$file = @file_get_contents('includes/clientside/static/enano-lib-basic.js');
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$pos_start_includes = strpos($file, '/*!START_INCLUDER*/');
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$pos_end_includes = strpos($file, '/*!END_INCLUDER*/');
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if ( !$pos_start_includes || !$pos_end_includes )
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{
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  die('// Error: enano-lib-basic does not have required metacomments');
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}
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$pos_end_includes += strlen('/*!END_INCLUDER*/');
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preg_match('/var thefiles = (\[([^\]]+?)\]);/', $file, $match);
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if ( empty($match) )
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  die('// Error: could not retrieve file list from enano-lib-basic');
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// Decode file list
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try
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{
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  $file_list = enano_json_decode($match[1]);
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}
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catch ( Exception $e )
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{
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  die("// Exception caught during file list parsing");
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}
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$apex = filemtime('includes/clientside/static/enano-lib-basic.js');
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$before_includes = substr($file, 0, $pos_start_includes);
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$after_includes = substr($file, $pos_end_includes);
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$everything .= $before_includes;
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$everything .= $after_includes;
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foreach ( $file_list as $js_file )
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{
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  $file_contents = file_get_contents("includes/clientside/static/$js_file");
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  $file_md5 = md5($file_contents);
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  $time = filemtime("includes/clientside/static/$js_file");
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  if ( $time > $apex )
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    $apex = $time;
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  // Is this file cached?
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  $cache_path = ENANO_ROOT . "/cache/jsres_$js_file.json";
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  $loaded_cache = false;
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  if ( file_exists($cache_path) )
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  {
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    // Load the cache file and parse it.
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    $cache_file = file_get_contents($cache_path);
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    try
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    {
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      $cache_file = enano_json_decode($cache_file);
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    }
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    catch ( Exception $e )
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    {
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      // Don't do anything - let our fallbacks come into place
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    }
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    if ( is_array($cache_file) && isset($cache_file['md5']) && isset($cache_file['src']) )
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    {
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      if ( $cache_file['md5'] === $file_md5 )
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      {
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        $loaded_cache = true;
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        $file_contents = $cache_file['src'];
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      }
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    }
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  }
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  if ( !$loaded_cache )
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  {
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    // Try to open the cache file and write to it. If we can't do that, just don't compress the code.
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    $handle = @fopen($cache_path, 'w');
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    if ( $handle )
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    {
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      $aggressive = in_array($js_file, $full_compress_safe);
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      if ( !in_array($js_file, $compress_unsafe) )
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        $file_contents = perform_js_compress($file_contents, $aggressive);
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      $payload = enano_json_encode(array(
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          'md5' => $file_md5,
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          'src' => $file_contents
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        ));
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      fwrite($handle, $payload);
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      fclose($handle);
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    }
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  }
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  $everything .= "\n // $js_file\n";
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  $everything .= "\n" . $file_contents;
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}
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542
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// generate ETag
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$etag = base64_encode(hexdecode(sha1($everything)));
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if ( isset($_SERVER['HTTP_IF_NONE_MATCH']) )
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{
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  if ( "\"$etag\"" == $_SERVER['HTTP_IF_NONE_MATCH'] )
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  {
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    header('HTTP/1.1 304 Not Modified');
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    exit();
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  }
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}
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$date = date('r', $apex);
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header("Date: $date");
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header("Last-Modified: $date");
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header("ETag: \"$etag\"");
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echo $everything;
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if ( $do_gzip )
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{
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  gzip_output();
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}
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