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         XHTMLCOMPILER . '/config.php',
  24         XHTMLCOMPILER . '/config.default.php',
  25         XHTMLCOMPILER . '/config.smoketest.php',
  26         XHTMLCOMPILER . '/conf/config.php',
  27         XHTMLCOMPILER . '/htaccess.php',
  28         'redirects.txt',
  29         '.htaccess.in',
  30     );
  31
  32     $mtime_htaccess = filemtime('.htaccess');
  33
  34     $no_changes_needed = true;
  35     foreach ($files_to_check as $file) {
  36         if (file_exists($file) && filemtime($file) > $mtime_htaccess) {
  37             $no_changes_needed = false;
  38             break;
  39         }
  40     }
  41
  42     if ($no_changes_needed) {
  43         throw new XHTMLCompiler_Exception(503, false,
  44             'No changes detected in relevant files');
  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 $n = array();
  81 $n[] = $identifier_begin;
  82 $n[] = 'DirectoryIndex index.html';
  83 $n[] = 'Options -Multiviews';
  84 $n[] = 'RewriteEngine on';
  85 $n[] = 'RewriteBase ' . $xc->getConf('web_path') . '/';
  86
  87 // create permanent redirects
  88 if (file_exists('redirects.txt')) {
  89     $redirects = explode("\n", file_get_contents('redirects.txt'));
  90     foreach ($redirects as $redirect) {
  91         $redirect = trim($redirect) . ' ';
  92         if ($redirect === ' ') continue;
  93         if ($redirect[0] === '#') continue;
  94         list($src, $dest, $p) = explode(' ', $redirect);
  95         if ($p !== '[P]') $src = '^' . preg_quote($src) . '$';
  96         // We use rewrite to prevent the appending of ?f= querystring
  97         $n[] = 'RewriteRule ' . $src . ' ' . $dest . ' [R=permanent,L]';
  98     }
  99 }
 100
 101 $big_exp = array();
 102 $directory_index = $xc->getConf('directory_index');
 103 $indexed_dirs = $xc->getConf('indexed_dirs');
 104 $allowed_dirs = $xc->getConf('allowed_dirs');
 105 foreach ($allowed_dirs as $dir => $recursive) {
 106     $r = '';
 107     if ($recursive) {
 108         $r = "([^/]+/)*"; // escaped slashes not necessary
 109     }
 110     $len = strlen($dir);
 111     $slash = (!$len || $dir[$len-1] === '/') ? '' : '/';
 112     $dir_exp = preg_quote($dir) . $slash . $r;
 113     $big_exp[$dir] = $dir_exp;
 114 }
 115 $full_dir_exp = implode('|', $big_exp);
 116
 117 // prefer the extension-less URL
 118 $n[] = 'RewriteCond %{THE_REQUEST} \.html\x20';
 119 $n[] = "RewriteRule ^(($full_dir_exp)[^/]+)\.html$ \$1 [NS,R=301]";
 120
 121 foreach ($allowed_dirs as $dir => $recursive) {
 122     if (is_array($indexed_dirs)) {
 123         $intercept = isset($indexed_dirs[$dir]) ? $indexed_dirs[$dir] : true;
 124     } else {
 125         $intercept = $indexed_dirs;
 126     }
 127     if (is_string($directory_index) && $intercept) {
 128         // setup index rewrite
 129         $n[] = "RewriteRule ^({$big_exp[$dir]})$ \$1$directory_index";
 130     }
 131 }
 132
 133 // allow pretty extension-less URLs for HTML pages
 134 // this could be generalized for other URLs
 135 $n[] = 'RewriteCond %{REQUEST_FILENAME} !-f';
 136 $n[] = 'RewriteCond %{REQUEST_FILENAME}.html -f';
 137 $n[] = 'RewriteCond %{HTTP_ACCEPT} text/html';
 138 $n[] = "RewriteRule ^(($full_dir_exp)[^/]+)$ \$1.html [N]";
 139
 140 // basic redirection if it doesn't exist
 141 $n[] = 'RewriteCond %{REQUEST_FILENAME} !-f [OR]';
 142 $n[] = 'RewriteCond %{QUERY_STRING} purge=1 [OR]';
 143 $n[] = 'RewriteCond %{HTTP_COOKIE} purgatory=1';
 144 $n[] = "RewriteRule ^(($full_dir_exp)[^/]+\.html)$ xhtml-compiler/main.php?f=\$1 [L,QSA]";
 145
 146 // if purge is set, also handle directories
 147 $n[] = 'RewriteCond %{QUERY_STRING} purge=1';
 148 $n[] = "RewriteRule ^($full_dir_exp)$ xhtml-compiler/main.php?f=\$1 [L,QSA]";
 149
 150 // add application/xhtml+xml if the browser supports it
 151 $n[] = 'RewriteCond %{HTTP_ACCEPT} application/xhtml\\+xml';
 152 $n[] = "RewriteRule ^(($full_dir_exp)[^/]+\.html)$ - \"[T=application/xhtml+xml,L]\"";
 153
 154 // xc-deps are forbidden to outside world
 155 $n[] = '<Files ~ "\.xc-deps$">';
 156 $n[] = '  Order allow,deny';
 157 $n[] = '  Deny from all';
 158 $n[] = '</Files>';
 159
 160 // errors.log is forbidden to outside world. In theory, this will occur only
 161 // in xhtml-compiler/, but it won't hurt to deny it everywhere.
 162 $n[] = '<Files errors.log>';
 163 $n[] = '  Order allow,deny';
 164 $n[] = '  Deny from all';
 165 $n[] = '</Files>';
 166
 167 // setup RSS
 168 $n[] = 'AddType application/rss+xml rss';
 169 $n[] = 'AddCharset UTF-8 .rss';
 170 $n[] = '<IfModule mod_headers.c>';
 171 $n[] = '  <Files ~ "\.rss$">';
 172 $n[] = '    Header append Cache-Control "no-cache, must-revalidate"';
 173 $n[] = '  </Files>';
 174 $n[] = '</IfModule>';
 175
 176 // set UTF-8 for HTML pages
 177 $n[] = 'AddCharset UTF-8 .html';
 178
 179 $n[] = $identifier_end;
 180
 181 $contents = str_replace($identifier_here, implode($n, PHP_EOL), $contents);
 182
 183 file_put_contents('.htaccess', $contents);
 184 chmod('.htaccess', 0644);
 185
 186 if (is_cli()) {
 187     echo "Okay: New .htaccess file successfully written\n";
 188     exit;
 189 }
 190
 191 ?><h1>200: Okay</h1>New <tt>.htaccess</tt> file successfully written