libraries/sanitizing.lib.php

   1 <?php
   2 /* vim: set expandtab sw=4 ts=4 sts=4: */
   3 /**
   4  * This is in a separate script because it's called from a number of scripts
   5  *
   6  * @package phpMyAdmin
   7  */
   8
   9 /**
  10  * Sanitizes $message, taking into account our special codes
  11  * for formatting.
  12  *
  13  * If you want to include result in element attribute, you should escape it.
  14  *
  15  * Examples:
  16  *
  17  * <p><?php echo PMA_sanitize($foo); ?></p>
  18  *
  19  * <a title="<?php echo PMA_sanitize($foo, true); ?>">bar</a>
  20  *
  21  * @uses    preg_replace()
  22  * @uses    strtr()
  23  * @param   string   the message
  24  * @param   boolean  whether to escape html in result
  25  *
  26  * @return  string   the sanitized message
  27  *
  28  * @access  public
  29  */
  30 function PMA_sanitize($message, $escape = false)
  31 {
  32     $replace_pairs = array(
  33         '<'         => '&lt;',
  34         '>'         => '&gt;',
  35         '[i]'       => '<em>',      // deprecated by em
  36         '[/i]'      => '</em>',     // deprecated by em
  37         '[em]'      => '<em>',
  38         '[/em]'     => '</em>',
  39         '[b]'       => '<strong>',  // deprecated by strong
  40         '[/b]'      => '</strong>', // deprecated by strong
  41         '[strong]'  => '<strong>',
  42         '[/strong]' => '</strong>',
  43         '[tt]'      => '<code>',    // deprecated by CODE or KBD
  44         '[/tt]'     => '</code>',   // deprecated by CODE or KBD
  45         '[code]'    => '<code>',
  46         '[/code]'   => '</code>',
  47         '[kbd]'     => '<kbd>',
  48         '[/kbd]'    => '</kbd>',
  49         '[br]'      => '<br />',
  50         '[/a]'      => '</a>',
  51         '[sup]'      => '<sup>',
  52         '[/sup]'      => '</sup>',
  53     );
  54     $message = strtr($message, $replace_pairs);
  55
  56     $pattern = '/\[a@([^"@]*)@([^]"]*)\]/';
  57
  58     if (preg_match_all($pattern, $message, $founds, PREG_SET_ORDER)) {
  59         $valid_links = array(
  60             'http',  // default http:// links (and https://)
  61             './Do',  // ./Documentation
  62         );
  63
  64         foreach ($founds as $found) {
  65             // only http... and ./Do... allowed
  66             if (! in_array(substr($found[1], 0, 4), $valid_links)) {
  67                 return $message;
  68             }
  69             // a-z and _ allowed in target
  70             if (! empty($found[2]) && preg_match('/[^a-z_]+/i', $found[2])) {
  71                 return $message;
  72             }
  73         }
  74
  75         $message = preg_replace($pattern, '<a href="\1" target="\2">', $message);
  76     }
  77
  78     if ($escape) {
  79         $message = htmlspecialchars($message);
  80     }
  81
  82     return $message;
  83 }
  84 ?>