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  * @version $Id$
   7  * @package phpMyAdmin
   8  */
   9
  10 /**
  11  * Sanitizes $message, taking into account our special codes
  12  * for formatting.
  13  *
  14  * If you want to include result in element attribute, you should escape it.
  15  *
  16  * Examples:
  17  *
  18  * <p><?php echo PMA_sanitize($foo); ?></p>
  19  *
  20  * <a title="<?php echo PMA_sanitize($foo, true); ?>">bar</a>
  21  *
  22  * @uses    preg_replace()
  23  * @uses    strtr()
  24  * @param   string   the message
  25  * @param   boolean  whether to escape html in result
  26  *
  27  * @return  string   the sanitized message
  28  *
  29  * @access  public
  30  */
  31 function PMA_sanitize($message, $escape = false)
  32 {
  33     $replace_pairs = array(
  34         '<'         => '&lt;',
  35         '>'         => '&gt;',
  36         '[i]'       => '<em>',      // deprecated by em
  37         '[/i]'      => '</em>',     // deprecated by em
  38         '[em]'      => '<em>',
  39         '[/em]'     => '</em>',
  40         '[b]'       => '<strong>',  // deprecated by strong
  41         '[/b]'      => '</strong>', // deprecated by strong
  42         '[strong]'  => '<strong>',
  43         '[/strong]' => '</strong>',
  44         '[tt]'      => '<code>',    // deprecated by CODE or KBD
  45         '[/tt]'     => '</code>',   // deprecated by CODE or KBD
  46         '[code]'    => '<code>',
  47         '[/code]'   => '</code>',
  48         '[kbd]'     => '<kbd>',
  49         '[/kbd]'    => '</kbd>',
  50         '[br]'      => '<br />',
  51         '[/a]'      => '</a>',
  52         '[sup]'      => '<sup>',
  53         '[/sup]'      => '</sup>',
  54     );
  55     $message = strtr($message, $replace_pairs);
  56
  57     $pattern = '/\[a@([^"@]*)@([^]"]*)\]/';
  58
  59     if (preg_match_all($pattern, $message, $founds, PREG_SET_ORDER)) {
  60         $valid_links = array(
  61             'http',  // default http:// links (and https://)
  62             './Do',  // ./Documentation
  63         );
  64
  65         foreach ($founds as $found) {
  66             // only http... and ./Do... allowed
  67             if (! in_array(substr($found[1], 0, 4), $valid_links)) {
  68                 return $message;
  69             }
  70             // a-z and _ allowed in target
  71             if (! empty($found[2]) && preg_match('/[^a-z_]+/i', $found[2])) {
  72                 return $message;
  73             }
  74         }
  75
  76         $message = preg_replace($pattern, '<a href="\1" target="\2">', $message);
  77     }
  78
  79     if ($escape) {
  80         $message = htmlspecialchars($message);
  81     }
  82
  83     return $message;
  84 }
  85 ?>