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  * @todo Create an HTAccess object to edit
   9  */
  10
  11 require 'common.php';
  12
  13 $xc = XHTMLCompiler::getInstance();
  14
  15 $identifier_begin = '# BEGIN xhtml-compiler/main.php mod_rewrite';
  16 $identifier_end   = '# END xhtml-compiler/main.php mod_rewrite';
  17 $identifier_here  = '# HERE xhtml-compiler/main.php mod_rewrite';
  18
  19 if (file_exists('.htaccess')) {
  20
  21     // do time check
  22     $files_to_check = array(
  23         '.htaccess.in',
  24         'xhtml-compiler/config.php',
  25         'xhtml-compiler/config.default.php',
  26         'xhtml-compiler/config.smoketest.php',
  27         'xhtml-compiler/htaccess.php',
  28     );
  29
  30     $mtime_htaccess = filemtime('.htaccess');
  31
  32     $no_changes_needed = true;
  33     foreach ($files_to_check as $file) {
  34         if (file_exists($file) && filemtime($file) > $mtime_htaccess) {
  35             $no_changes_needed = false;
  36             break;
  37         }
  38     }
  39
  40     if ($no_changes_needed) {
  41         throw new XHTMLCompiler_Exception(503, false,
  42             'No changes detected in <tt>xhtml-compiler/config.php</tt>,
  43             <tt>xhtml-compiler/config.default.php</tt> or
  44             <tt>xhtml-compiler/htaccess.php</tt>.');
  45     }
  46
  47     if (!file_exists('.htaccess.in')) {
  48         $contents = file_get_contents('.htaccess');
  49     } else {
  50         $contents = file_get_contents('.htaccess.in');
  51     }
  52
  53     // do writeability check
  54     if (
  55         (
  56             strpos($contents, $identifier_begin) === false ||
  57             strpos($contents, $identifier_end) === false
  58         ) &&
  59         strpos($contents, $identifier_here) === false
  60     ) {
  61         throw new XHTMLCompiler_Exception(503, false,
  62             'Pre-existing htaccess not configured to accept new rules');
  63     }
  64
  65     // replace old rules with new set
  66     $regex =
  67         '/' .
  68             preg_quote($identifier_begin, '/') .
  69             '.+?' .
  70             preg_quote($identifier_end, '/') .
  71         '/s';
  72
  73     $contents = preg_replace($regex, $identifier_here, $contents);
  74
  75 } else {
  76     $contents = $identifier_here;
  77 }
  78
  79 // build the new htaccess
  80 $new_contents = array();
  81 $new_contents[] = $identifier_begin;
  82 $new_contents[] = 'RewriteEngine on';
  83 $new_contents[] = 'RewriteBase ' . $xc->getConf('web_path') . '/';
  84
  85 $big_exp = array();
  86 $directory_index = $xc->getConf('directory_index');
  87 $indexed_dirs = $xc->getConf('indexed_dirs');
  88 $allowed_dirs = $xc->getConf('allowed_dirs');
  89 foreach ($allowed_dirs as $dir => $recursive) {
  90     $r = '';
  91     if ($recursive) {
  92         $r = "([^/]+/)*"; // escaped slashes not necessary
  93     }
  94     $len = strlen($dir);
  95     $slash = (!$len || $dir[$len-1] === '/') ? '' : '/';
  96     $dir_exp = preg_quote($dir) . $slash . $r;
  97
  98     if (is_array($indexed_dirs)) {
  99         $intercept = isset($indexed_dirs[$dir]) ? $indexed_dirs[$dir] : true;
 100     } else {
 101         $intercept = $indexed_dirs;
 102     }
 103     if (is_string($directory_index) && $intercept) {
 104         // setup index rewrite
 105         $new_contents[] = "RewriteRule ^($dir_exp)$ \$1$directory_index";
 106     }
 107     $big_exp[] = $dir_exp;
 108 }
 109
 110 $full_dir_exp = implode('|', $big_exp);
 111 $new_contents[] = 'RewriteCond %{REQUEST_FILENAME} !-f [OR]';
 112 $new_contents[] = 'RewriteCond %{QUERY_STRING} purge=1 [OR]';
 113 $new_contents[] = 'RewriteCond %{HTTP_COOKIE} purgatory=1';
 114 $new_contents[] = "RewriteRule ^(($full_dir_exp)[^/]+\.html)$ xhtml-compiler/main.php?f=\$1 [L,QSA]";
 115
 116 // if purge is set, also handle directories
 117 $new_contents[] = 'RewriteCond %{QUERY_STRING} purge=1';
 118 $new_contents[] = "RewriteRule ^($full_dir_exp)$ xhtml-compiler/main.php?f=\$1 [L,QSA]";
 119
 120 // add application/xhtml+xml if the browser supports it
 121 $new_contents[] = 'RewriteCond %{HTTP_ACCEPT} application/xhtml\\+xml';
 122 $new_contents[] = "RewriteRule ^(($full_dir_exp)[^/]+\.html)$ - \"[T=application/xhtml+xml,L]\"";
 123
 124 // xc-deps are forbidden to outside world
 125 $new_contents[] = '<Files ~ "\.xc-deps$">';
 126 $new_contents[] = '  Order allow,deny';
 127 $new_contents[] = '  Deny from all';
 128 $new_contents[] = '</Files>';
 129
 130 // setup RSS
 131 $new_contents[] = 'AddType application/rss+xml rss';
 132 $new_contents[] = 'AddCharset UTF-8 .rss';
 133 $new_contents[] = '<IfModule mod_headers.c>';
 134 $new_contents[] = '  <Files ~ "\.rss$">';
 135 $new_contents[] = '    Header append Cache-Control "no-cache, must-revalidate"';
 136 $new_contents[] = '  </Files>';
 137 $new_contents[] = '</IfModule>';
 138
 139 // set UTF-8 for HTML pages
 140 $new_contents[] = 'AddCharset UTF-8 .html';
 141
 142 $new_contents[] = $identifier_end;
 143
 144 $contents = str_replace($identifier_here, implode($new_contents, PHP_EOL), $contents);
 145
 146 file_put_contents('.htaccess', $contents);
 147 chmod('.htaccess', 0644);
 148
 149 ?><h1>200: Okay</h1>New <tt>.htaccess</tt> file successfully written