From 07155a084db111c0586ce7ed958c87eed6116704 Mon Sep 17 00:00:00 2001
From: marcus <marcus@36083f99-b078-4883-b0ff-0f9b5a30f544>
Date: Fri, 17 Apr 2009 15:41:16 +0000
Subject: Closes #833: Kses now built as module

git-svn-id: https://code.elgg.org/elgg/trunk@3222 36083f99-b078-4883-b0ff-0f9b5a30f544
---
 vendors/kses/kses.php | 555 --------------------------------------------------
 1 file changed, 555 deletions(-)
 delete mode 100644 vendors/kses/kses.php

(limited to 'vendors/kses/kses.php')

diff --git a/vendors/kses/kses.php b/vendors/kses/kses.php
deleted file mode 100644
index 65da29599..000000000
--- a/vendors/kses/kses.php
+++ /dev/null
@@ -1,555 +0,0 @@
-<?php
-
-# kses 0.2.2 - HTML/XHTML filter that only allows some elements and attributes
-# Copyright (C) 2002, 2003, 2005  Ulf Harnhammar
-#
-# This program is free software and open source software; you can redistribute
-# it and/or modify it under the terms of the GNU General Public License as
-# published by the Free Software Foundation; either version 2 of the License,
-# or (at your option) any later version.
-#
-# This program is distributed in the hope that it will be useful, but WITHOUT
-# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
-# FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
-# more details.
-#
-# You should have received a copy of the GNU General Public License along
-# with this program; if not, write to the Free Software Foundation, Inc.,
-# 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA  or visit
-# http://www.gnu.org/licenses/gpl.html
-#
-# *** CONTACT INFORMATION ***
-#
-# E-mail:      metaur at users dot sourceforge dot net
-# Web page:    http://sourceforge.net/projects/kses
-# Paper mail:  Ulf Harnhammar
-#              Ymergatan 17 C
-#              753 25  Uppsala
-#              SWEDEN
-#
-# [kses strips evil scripts!]
-
-
-function kses($string, $allowed_html, $allowed_protocols =
-               array('http', 'https', 'ftp', 'news', 'nntp', 'telnet',
-                     'gopher', 'mailto'))
-###############################################################################
-# This function makes sure that only the allowed HTML element names, attribute
-# names and attribute values plus only sane HTML entities will occur in
-# $string. You have to remove any slashes from PHP's magic quotes before you
-# call this function.
-###############################################################################
-{
-  $string = kses_no_null($string);
-  $string = kses_js_entities($string);
-  $string = kses_normalize_entities($string);
-  $string = kses_hook($string);
-  $allowed_html_fixed = kses_array_lc($allowed_html);
-  return kses_split($string, $allowed_html_fixed, $allowed_protocols);
-} # function kses
-
-
-function kses_hook($string)
-###############################################################################
-# You add any kses hooks here.
-###############################################################################
-{
-  return $string;
-} # function kses_hook
-
-
-function kses_version()
-###############################################################################
-# This function returns kses' version number.
-###############################################################################
-{
-  return '0.2.2';
-} # function kses_version
-
-
-function kses_split($string, $allowed_html, $allowed_protocols)
-###############################################################################
-# This function searches for HTML tags, no matter how malformed. It also
-# matches stray ">" characters.
-###############################################################################
-{
-  return preg_replace('%(<'.   # EITHER: <
-                      '[^>]*'. # things that aren't >
-                      '(>|$)'. # > or end of string
-                      '|>)%e', # OR: just a >
-                      "kses_split2('\\1', \$allowed_html, ".
-                      '$allowed_protocols)',
-                      $string);
-} # function kses_split
-
-
-function kses_split2($string, $allowed_html, $allowed_protocols)
-###############################################################################
-# This function does a lot of work. It rejects some very malformed things
-# like <:::>. It returns an empty string, if the element isn't allowed (look
-# ma, no strip_tags()!). Otherwise it splits the tag into an element and an
-# attribute list.
-###############################################################################
-{
-  $string = kses_stripslashes($string);
-
-  if (substr($string, 0, 1) != '<')
-    return '&gt;';
-    # It matched a ">" character
-
-  if (!preg_match('%^<\s*(/\s*)?([a-zA-Z0-9]+)([^>]*)>?$%', $string, $matches))
-    return '';
-    # It's seriously malformed
-
-  $slash = trim($matches[1]);
-  $elem = $matches[2];
-  $attrlist = $matches[3];
-
-  if (!@isset($allowed_html[strtolower($elem)]))
-    return '';
-    # They are using a not allowed HTML element
-
-  if ($slash != '')
-    return "<$slash$elem>";
-  # No attributes are allowed for closing elements
-
-  return kses_attr("$slash$elem", $attrlist, $allowed_html,
-                   $allowed_protocols);
-} # function kses_split2
-
-
-function kses_attr($element, $attr, $allowed_html, $allowed_protocols)
-###############################################################################
-# This function removes all attributes, if none are allowed for this element.
-# If some are allowed it calls kses_hair() to split them further, and then it
-# builds up new HTML code from the data that kses_hair() returns. It also
-# removes "<" and ">" characters, if there are any left. One more thing it
-# does is to check if the tag has a closing XHTML slash, and if it does,
-# it puts one in the returned code as well.
-###############################################################################
-{
-# Is there a closing XHTML slash at the end of the attributes?
-
-  $xhtml_slash = '';
-  if (preg_match('%\s/\s*$%', $attr))
-    $xhtml_slash = ' /';
-
-# Are any attributes allowed at all for this element?
-
-  if (@count($allowed_html[strtolower($element)]) == 0)
-    return "<$element$xhtml_slash>";
-
-# Split it
-
-  $attrarr = kses_hair($attr, $allowed_protocols);
-
-# Go through $attrarr, and save the allowed attributes for this element
-# in $attr2
-
-  $attr2 = '';
-
-  foreach ($attrarr as $arreach)
-  {
-    if (!@isset($allowed_html[strtolower($element)]
-                            [strtolower($arreach['name'])]))
-      continue; # the attribute is not allowed
-
-    $current = $allowed_html[strtolower($element)]
-                            [strtolower($arreach['name'])];
-
-    if (!is_array($current))
-      $attr2 .= ' '.$arreach['whole'];
-    # there are no checks
-
-    else
-    {
-    # there are some checks
-      $ok = true;
-      foreach ($current as $currkey => $currval)
-        if (!kses_check_attr_val($arreach['value'], $arreach['vless'],
-                                 $currkey, $currval))
-        { $ok = false; break; }
-
-      if ($ok)
-        $attr2 .= ' '.$arreach['whole']; # it passed them
-    } # if !is_array($current)
-  } # foreach
-
-# Remove any "<" or ">" characters
-
-  $attr2 = preg_replace('/[<>]/', '', $attr2);
-
-  return "<$element$attr2$xhtml_slash>";
-} # function kses_attr
-
-
-function kses_hair($attr, $allowed_protocols)
-###############################################################################
-# This function does a lot of work. It parses an attribute list into an array
-# with attribute data, and tries to do the right thing even if it gets weird
-# input. It will add quotes around attribute values that don't have any quotes
-# or apostrophes around them, to make it easier to produce HTML code that will
-# conform to W3C's HTML specification. It will also remove bad URL protocols
-# from attribute values.
-###############################################################################
-{
-  $attrarr = array();
-  $mode = 0;
-  $attrname = '';
-
-# Loop through the whole attribute list
-
-  while (strlen($attr) != 0)
-  {
-    $working = 0; # Was the last operation successful?
-
-    switch ($mode)
-    {
-      case 0: # attribute name, href for instance
-
-        if (preg_match('/^([-a-zA-Z]+)/', $attr, $match))
-        {
-          $attrname = $match[1];
-          $working = $mode = 1;
-          $attr = preg_replace('/^[-a-zA-Z]+/', '', $attr);
-        }
-
-        break;
-
-      case 1: # equals sign or valueless ("selected")
-
-        if (preg_match('/^\s*=\s*/', $attr)) # equals sign
-        {
-          $working = 1; $mode = 2;
-          $attr = preg_replace('/^\s*=\s*/', '', $attr);
-          break;
-        }
-
-        if (preg_match('/^\s+/', $attr)) # valueless
-        {
-          $working = 1; $mode = 0;
-          $attrarr[] = array
-                        ('name'  => $attrname,
-                         'value' => '',
-                         'whole' => $attrname,
-                         'vless' => 'y');
-          $attr = preg_replace('/^\s+/', '', $attr);
-        }
-
-        break;
-
-      case 2: # attribute value, a URL after href= for instance
-
-        if (preg_match('/^"([^"]*)"(\s+|$)/', $attr, $match))
-         # "value"
-        {
-          $thisval = kses_bad_protocol($match[1], $allowed_protocols);
-
-          $attrarr[] = array
-                        ('name'  => $attrname,
-                         'value' => $thisval,
-                         'whole' => "$attrname=\"$thisval\"",
-                         'vless' => 'n');
-          $working = 1; $mode = 0;
-          $attr = preg_replace('/^"[^"]*"(\s+|$)/', '', $attr);
-          break;
-        }
-
-        if (preg_match("/^'([^']*)'(\s+|$)/", $attr, $match))
-         # 'value'
-        {
-          $thisval = kses_bad_protocol($match[1], $allowed_protocols);
-
-          $attrarr[] = array
-                        ('name'  => $attrname,
-                         'value' => $thisval,
-                         'whole' => "$attrname='$thisval'",
-                         'vless' => 'n');
-          $working = 1; $mode = 0;
-          $attr = preg_replace("/^'[^']*'(\s+|$)/", '', $attr);
-          break;
-        }
-
-        if (preg_match("%^([^\s\"']+)(\s+|$)%", $attr, $match))
-         # value
-        {
-          $thisval = kses_bad_protocol($match[1], $allowed_protocols);
-
-          $attrarr[] = array
-                        ('name'  => $attrname,
-                         'value' => $thisval,
-                         'whole' => "$attrname=\"$thisval\"",
-                         'vless' => 'n');
-                         # We add quotes to conform to W3C's HTML spec.
-          $working = 1; $mode = 0;
-          $attr = preg_replace("%^[^\s\"']+(\s+|$)%", '', $attr);
-        }
-
-        break;
-    } # switch
-
-    if ($working == 0) # not well formed, remove and try again
-    {
-      $attr = kses_html_error($attr);
-      $mode = 0;
-    }
-  } # while
-
-  if ($mode == 1)
-  # special case, for when the attribute list ends with a valueless
-  # attribute like "selected"
-    $attrarr[] = array
-                  ('name'  => $attrname,
-                   'value' => '',
-                   'whole' => $attrname,
-                   'vless' => 'y');
-
-  return $attrarr;
-} # function kses_hair
-
-
-function kses_check_attr_val($value, $vless, $checkname, $checkvalue)
-###############################################################################
-# This function performs different checks for attribute values. The currently
-# implemented checks are "maxlen", "minlen", "maxval", "minval" and "valueless"
-# with even more checks to come soon.
-###############################################################################
-{
-  $ok = true;
-
-  switch (strtolower($checkname))
-  {
-    case 'maxlen':
-    # The maxlen check makes sure that the attribute value has a length not
-    # greater than the given value. This can be used to avoid Buffer Overflows
-    # in WWW clients and various Internet servers.
-
-      if (strlen($value) > $checkvalue)
-        $ok = false;
-      break;
-
-    case 'minlen':
-    # The minlen check makes sure that the attribute value has a length not
-    # smaller than the given value.
-
-      if (strlen($value) < $checkvalue)
-        $ok = false;
-      break;
-
-    case 'maxval':
-    # The maxval check does two things: it checks that the attribute value is
-    # an integer from 0 and up, without an excessive amount of zeroes or
-    # whitespace (to avoid Buffer Overflows). It also checks that the attribute
-    # value is not greater than the given value.
-    # This check can be used to avoid Denial of Service attacks.
-
-      if (!preg_match('/^\s{0,6}[0-9]{1,6}\s{0,6}$/', $value))
-        $ok = false;
-      if ($value > $checkvalue)
-        $ok = false;
-      break;
-
-    case 'minval':
-    # The minval check checks that the attribute value is a positive integer,
-    # and that it is not smaller than the given value.
-
-      if (!preg_match('/^\s{0,6}[0-9]{1,6}\s{0,6}$/', $value))
-        $ok = false;
-      if ($value < $checkvalue)
-        $ok = false;
-      break;
-
-    case 'valueless':
-    # The valueless check checks if the attribute has a value
-    # (like <a href="blah">) or not (<option selected>). If the given value
-    # is a "y" or a "Y", the attribute must not have a value.
-    # If the given value is an "n" or an "N", the attribute must have one.
-
-      if (strtolower($checkvalue) != $vless)
-        $ok = false;
-      break;
-  } # switch
-
-  return $ok;
-} # function kses_check_attr_val
-
-
-function kses_bad_protocol($string, $allowed_protocols)
-###############################################################################
-# This function removes all non-allowed protocols from the beginning of
-# $string. It ignores whitespace and the case of the letters, and it does
-# understand HTML entities. It does its work in a while loop, so it won't be
-# fooled by a string like "javascript:javascript:alert(57)".
-###############################################################################
-{
-  $string = kses_no_null($string);
-  $string = preg_replace('/\xad+/', '', $string); # deals with Opera "feature"
-  $string2 = $string.'a';
-
-  while ($string != $string2)
-  {
-    $string2 = $string;
-    $string = kses_bad_protocol_once($string, $allowed_protocols);
-  } # while
-
-  return $string;
-} # function kses_bad_protocol
-
-
-function kses_no_null($string)
-###############################################################################
-# This function removes any NULL characters in $string.
-###############################################################################
-{
-  $string = preg_replace('/\0+/', '', $string);
-  $string = preg_replace('/(\\\\0)+/', '', $string);
-
-  return $string;
-} # function kses_no_null
-
-
-function kses_stripslashes($string)
-###############################################################################
-# This function changes the character sequence  \"  to just  "
-# It leaves all other slashes alone. It's really weird, but the quoting from
-# preg_replace(//e) seems to require this.
-###############################################################################
-{
-  return preg_replace('%\\\\"%', '"', $string);
-} # function kses_stripslashes
-
-
-function kses_array_lc($inarray)
-###############################################################################
-# This function goes through an array, and changes the keys to all lower case.
-###############################################################################
-{
-  $outarray = array();
-
-  if (sizeof($inarray))
-  foreach ($inarray as $inkey => $inval)
-  {
-    $outkey = strtolower($inkey);
-    $outarray[$outkey] = array();
-
-    foreach ($inval as $inkey2 => $inval2)
-    {
-      $outkey2 = strtolower($inkey2);
-      $outarray[$outkey][$outkey2] = $inval2;
-    } # foreach $inval
-  } # foreach $inarray
-
-  return $outarray;
-} # function kses_array_lc
-
-
-function kses_js_entities($string)
-###############################################################################
-# This function removes the HTML JavaScript entities found in early versions of
-# Netscape 4.
-###############################################################################
-{
-  return preg_replace('%&\s*\{[^}]*(\}\s*;?|$)%', '', $string);
-} # function kses_js_entities
-
-
-function kses_html_error($string)
-###############################################################################
-# This function deals with parsing errors in kses_hair(). The general plan is
-# to remove everything to and including some whitespace, but it deals with
-# quotes and apostrophes as well.
-###############################################################################
-{
-  return preg_replace('/^("[^"]*("|$)|\'[^\']*(\'|$)|\S)*\s*/', '', $string);
-} # function kses_html_error
-
-
-function kses_bad_protocol_once($string, $allowed_protocols)
-###############################################################################
-# This function searches for URL protocols at the beginning of $string, while
-# handling whitespace and HTML entities.
-###############################################################################
-{
-  return preg_replace('/^((&[^;]*;|[\sA-Za-z0-9])*)'.
-                      '(:|&#58;|&#[Xx]3[Aa];)\s*/e',
-                      'kses_bad_protocol_once2("\\1", $allowed_protocols)',
-                      $string);
-} # function kses_bad_protocol_once
-
-
-function kses_bad_protocol_once2($string, $allowed_protocols)
-###############################################################################
-# This function processes URL protocols, checks to see if they're in the white-
-# list or not, and returns different data depending on the answer.
-###############################################################################
-{
-  $string2 = kses_decode_entities($string);
-  $string2 = preg_replace('/\s/', '', $string2);
-  $string2 = kses_no_null($string2);
-  $string2 = preg_replace('/\xad+/', '', $string2);
-   # deals with Opera "feature"
-  $string2 = strtolower($string2);
-
-  $allowed = false;
-  foreach ($allowed_protocols as $one_protocol)
-    if (strtolower($one_protocol) == $string2)
-    {
-      $allowed = true;
-      break;
-    }
-
-  if ($allowed)
-    return "$string2:";
-  else
-    return '';
-} # function kses_bad_protocol_once2
-
-
-function kses_normalize_entities($string)
-###############################################################################
-# This function normalizes HTML entities. It will convert "AT&T" to the correct
-# "AT&amp;T", "&#00058;" to "&#58;", "&#XYZZY;" to "&amp;#XYZZY;" and so on.
-###############################################################################
-{
-# Disarm all entities by converting & to &amp;
-
-  // $string = str_replace('&', '&amp;', $string); // [Marcus Povey 20090212: Commented out in ref #561. Needs a better solution. ]
-
-# Change back the allowed entities in our entity whitelist
-
-  $string = preg_replace('/&amp;([A-Za-z][A-Za-z0-9]{0,19});/',
-                         '&\\1;', $string);
-  $string = preg_replace('/&amp;#0*([0-9]{1,5});/e',
-                         'kses_normalize_entities2("\\1")', $string);
-  $string = preg_replace('/&amp;#([Xx])0*(([0-9A-Fa-f]{2}){1,2});/',
-                         '&#\\1\\2;', $string);
-
-  return $string;
-} # function kses_normalize_entities
-
-
-function kses_normalize_entities2($i)
-###############################################################################
-# This function helps kses_normalize_entities() to only accept 16 bit values
-# and nothing more for &#number; entities.
-###############################################################################
-{
-  return (($i > 65535) ? "&amp;#$i;" : "&#$i;");
-} # function kses_normalize_entities2
-
-
-function kses_decode_entities($string)
-###############################################################################
-# This function decodes numeric HTML entities (&#65; and &#x41;). It doesn't
-# do anything with other entities like &auml;, but we don't need them in the
-# URL protocol whitelisting system anyway.
-###############################################################################
-{
-  $string = preg_replace('/&#([0-9]+);/e', 'chr("\\1")', $string);
-  $string = preg_replace('/&#[Xx]([0-9A-Fa-f]+);/e', 'chr(hexdec("\\1"))',
-                         $string);
-
-  return $string;
-} # function kses_decode_entities
-
-?>
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