htaccess.php

   1 <?php
   2
   3 /**
   4  * Generates the appropriate mod_rewrite rules in the htaccess file.
   5  * @note If a .htaccess.in prototype file is present in the directory,
   6  *       it will be used as the "base" htaccess to determine the new
   7  *       one, and local changes to .htaccess will ALWAYS be overwritten
   8  */
   9
  10 require 'common.php';
  11
  12 $xc = XHTMLCompiler::getInstance();
  13
  14 $identifier_begin = '# BEGIN xhtml-compiler/main.php mod_rewrite';
  15 $identifier_end   = '# END xhtml-compiler/main.php mod_rewrite';
  16 $identifier_here  = '# HERE xhtml-compiler/main.php mod_rewrite';
  17
  18 if (file_exists('.htaccess')) {
  19
  20     // do time check
  21     $files_to_check = array(
  22         '.htaccess.in',
  23         'xhtml-compiler/config.php',
  24         'xhtml-compiler/config.default.php',
  25         'xhtml-compiler/config.smoketest.php',
  26         'xhtml-compiler/htaccess.php',
  27     );
  28
  29     $mtime_htaccess = filemtime('.htaccess');
  30
  31     $no_changes_needed = true;
  32     foreach ($files_to_check as $file) {
  33         if (file_exists($file) && filemtime($file) > $mtime_htaccess) {
  34             $no_changes_needed = false;
  35             break;
  36         }
  37     }
  38
  39     if ($no_changes_needed) {
  40         throw new XHTMLCompiler_Exception(503, false,
  41             'No changes detected in <tt>xhtml-compiler/config.php</tt>,
  42             <tt>xhtml-compiler/config.default.php</tt> or
  43             <tt>xhtml-compiler/htaccess.php</tt>.');
  44     }
  45
  46     if (!file_exists('.htaccess.in')) {
  47         $contents = file_get_contents('.htaccess');
  48     } else {
  49         $contents = file_get_contents('.htaccess.in');
  50     }
  51
  52     // do writeability check
  53     if (
  54         (
  55             strpos($contents, $identifier_begin) === false ||
  56             strpos($contents, $identifier_end) === false
  57         ) &&
  58         strpos($contents, $identifier_here) === false
  59     ) {
  60         throw new XHTMLCompiler_Exception(503, false,
  61             'Pre-existing htaccess not configured to accept new rules');
  62     }
  63
  64     // replace old rules with new set
  65     $regex =
  66         '/' .
  67             preg_quote($identifier_begin, '/') .
  68             '.+?' .
  69             preg_quote($identifier_end, '/') .
  70         '/s';
  71
  72     $contents = preg_replace($regex, $identifier_here, $contents);
  73
  74 } else {
  75     $contents = $identifier_here;
  76 }
  77
  78 // build the new htaccess
  79 $new_contents = array();
  80 $new_contents[] = $identifier_begin;
  81 $new_contents[] = 'RewriteEngine on';
  82
  83 $big_exp = array();
  84 $directory_index = $xc->getConf('directory_index');
  85 $indexed_dirs = $xc->getConf('indexed_dirs');
  86 $allowed_dirs = $xc->getConf('allowed_dirs');
  87 foreach ($allowed_dirs as $dir => $recursive) {
  88     $r = '';
  89     if ($recursive) {
  90         $r = "([^/]+/)*"; // escaped slashes not necessary
  91     }
  92     $len = strlen($dir);
  93     $slash = (!$len || $dir[$len-1] === '/') ? '' : '/';
  94     $dir_exp = preg_quote($dir) . $slash . $r;
  95
  96     if (is_array($indexed_dirs)) {
  97         $intercept = isset($indexed_dirs[$dir]) ? $indexed_dirs[$dir] : true;
  98     } else {
  99         $intercept = $indexed_dirs;
 100     }
 101     if (is_string($directory_index) && $intercept) {
 102         // setup index rewrite
 103         $new_contents[] = "RewriteRule ^($dir_exp)$ \$1$directory_index";
 104     }
 105     $big_exp[] = $dir_exp;
 106 }
 107
 108 $full_dir_exp = implode('|', $big_exp);
 109 $new_contents[] = 'RewriteCond %{REQUEST_FILENAME} !-f [OR]';
 110 $new_contents[] = 'RewriteCond %{QUERY_STRING} purge=1 [OR]';
 111 $new_contents[] = 'RewriteCond %{HTTP_COOKIE} purgatory=1';
 112 $new_contents[] = "RewriteRule ^(($full_dir_exp)[^/]+\.html)$ xhtml-compiler/main.php?f=\$1 [L,QSA]";
 113
 114 // if purge is set, also handle directories
 115 $new_contents[] = 'RewriteCond %{QUERY_STRING} purge=1';
 116 $new_contents[] = "RewriteRule ^($full_dir_exp)$ xhtml-compiler/main.php?f=\$1 [L,QSA]";
 117
 118 // xc-deps are forbidden to outside world
 119 $new_contents[] = '<Files ~ "\.xc-deps$">';
 120 $new_contents[] = '  Order allow,deny';
 121 $new_contents[] = '  Deny from all';
 122 $new_contents[] = '</Files>';
 123
 124 // setup RSS
 125 $new_contents[] = 'AddType application/rss+xml rss';
 126 $new_contents[] = 'AddCharset UTF-8 .rss';
 127 $new_contents[] = '<IfModule mod_headers.c>';
 128 $new_contents[] = '  <Files ~ "\.rss$">';
 129 $new_contents[] = '    Header append Cache-Control "no-cache, must-revalidate"';
 130 $new_contents[] = '  </Files>';
 131 $new_contents[] = '</IfModule>';
 132
 133 // set UTF-8 for HTML pages
 134 $new_contents[] = 'AddCharset UTF-8 .html';
 135
 136 $new_contents[] = $identifier_end;
 137
 138 $contents = str_replace($identifier_here, implode($new_contents, PHP_EOL), $contents);
 139
 140 file_put_contents('.htaccess', $contents);
 141 chmod('.htaccess', 0644);
 142
 143 ?><h1>200: Okay</h1>New <tt>.htaccess</tt> file successfully written