+++ /dev/null
-<?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 3 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!]
- *
- * @package moodlecore
- * @copyright Ulf Harnhammar {@link http://sourceforge.net/projects/kses}
- * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
- */
-
-/**
- * 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.
- *
- * @param string $string
- * @param string $allowed_html
- * @param array $allowed_protocols
- * @return string
- */
-function kses($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
-
-
-/**
- * You add any kses hooks here
- *
- * @param string $string
- * @return string
- */
-function kses_hook($string)
-###############################################################################
-# You add any kses hooks here.
-###############################################################################
-{
- return $string;
-} # function kses_hook
-
-/**
- * This function returns kses' version number.
- *
- * @return string
- */
-function kses_version()
-###############################################################################
-# This function returns kses' version number.
-###############################################################################
-{
- return '0.2.2';
-} # function kses_version
-
-
-/**
- * This function searches for HTML tags, no matter how malformed. It also
- * matches stray ">" characters.
- *
- * @param string $string
- * @param string $allowed_html
- * @param array $allowed_protocols
- * @return string
- */
-function kses_split($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
-
-/**
- * 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.
- *
- * @param string $string
- * @param string $allowed_html
- * @param array $allowed_protocols
- * @return string
- */
-function kses_split2($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($string, 0, 1) != '<')
- return '>';
- # It matched a ">" character
-
- if (!preg_match('%^<\s*(/\s*)?([a-zA-Z0-9]+)([^>]*)>?$%', $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
-
-/**
- * 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.
- *
- * @param string $element
- * @param string $attr
- * @param string $allowed_html
- * @param array $allowed_protocols
- * @return string
- */
-function kses_attr($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
-
-/**
- * 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.
- *
- * @param string $attr
- * @param array $allowed_protocols
- * @return array
- */
-function kses_hair($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, $match))
- # "value"
- {
- // MDL-2684 - kses stripping CSS styles that it thinks look like protocols
- if ($attrname == 'style') {
- $thisval = $match[1];
- } else {
- $thisval = kses_bad_protocol($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
-
-/**
- * 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.
- *
- * @param string $value
- * @param string $vless
- * @param string $checkname
- * @param string $checkvalue
- * @return bool
- */
-function kses_check_attr_val($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
-
-/**
- * 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)".
- *
- * @param string $string
- * @param array $$allowed_protocols
- * @return string
- */
-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('/([^\xc3-\xcf])\xad+/', '\\1', $string); # deals with Opera "feature" -- moodle utf8 fix
- $string2 = $string.'a';
-
- while ($string != $string2)
- {
- $string2 = $string;
- $string = kses_bad_protocol_once($string, $allowed_protocols);
- } # while
-
- return $string;
-} # function kses_bad_protocol
-
-/**
- * This function removes any NULL characters in $string.
- *
- * @param string $string
- * @return string
- */
-function kses_no_null($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
-
-
-/**
- * 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.
- *
- * @param string $string
- * @return string
- */
-function kses_stripslashes($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
-
-
-/**
- * This function goes through an array, and changes the keys to all lower case.
- *
- * @param array $inarray
- * @return array
- */
-function kses_array_lc($inarray)
-###############################################################################
-# This function goes through an array, and changes the keys to all lower case.
-###############################################################################
-{
- $outarray = array();
-
- foreach ($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
-
-/**
- * This function removes the HTML JavaScript entities found in early versions of
- * Netscape 4.
- *
- * @param string $string
- */
-function kses_js_entities($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
-
-/**
- * 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.
- *
- * @param string $string
- * @return string
- */
-function kses_html_error($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
-
-/**
- * This function searches for URL protocols at the beginning of $string, while
- * handling whitespace and HTML entities.
- *
- * @param string $string
- * @param string $allowed_protocols
- * @return string
- */
-function kses_bad_protocol_once($string, $allowed_protocols)
-###############################################################################
-# This function searches for URL protocols at the beginning of $string, while
-# handling whitespace and HTML entities.
-###############################################################################
-{
- $string2 = preg_split('/:|:|:/i', $string, 2);
- if(isset($string2[1]) && !preg_match('%/\?%',$string2[0]))
- {
- $string = kses_bad_protocol_once2($string2[0],$allowed_protocols).trim($string2[1]);
- }
- return $string;
-} # function kses_bad_protocol_once
-
-/**
- * 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.
- *
- * @param string $string
- * @param string $allowed_protocols
- * @return string
- */
-function kses_bad_protocol_once2($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
-
-/**
- * This function normalizes HTML entities. It will convert "AT&T" to the correct
- * "AT&T", ":" to ":", "&#XYZZY;" to "&#XYZZY;" and so on.
- *
- * @param string $string
- * @return string
- */
-function kses_normalize_entities($string)
-###############################################################################
-# This function normalizes HTML entities. It will convert "AT&T" to the correct
-# "AT&T", ":" to ":", "&#XYZZY;" to "&#XYZZY;" and so on.
-###############################################################################
-{
-# Disarm all entities by converting & to &
-
- $string = str_replace('&', '&', $string);
-
-# Change back the allowed entities in our entity whitelist
-
- $string = preg_replace('/&([A-Za-z][A-Za-z0-9]{0,19});/',
- '&\\1;', $string);
- $string = preg_replace('/&#0*([0-9]{1,5});/e',
- 'kses_normalize_entities2("\\1")', $string);
- $string = preg_replace('/&#([Xx])0*(([0-9A-Fa-f]{2}){1,2});/',
- '&#\\1\\2;', $string);
-
- return $string;
-} # function kses_normalize_entities
-
-/**
- * This function helps kses_normalize_entities() to only accept 16 bit values
- * and nothing more for &#number; entities.
- *
- * @param int $i
- * @return string
- */
-function kses_normalize_entities2($i)
-###############################################################################
-# This function helps kses_normalize_entities() to only accept 16 bit values
-# and nothing more for &#number; entities.
-###############################################################################
-{
- return (($i > 65535) ? "&#$i;" : "&#$i;");
-} # function kses_normalize_entities2
-
-/**
- * This function decodes numeric HTML entities (A and A). It doesn't
- * do anything with other entities like ä, but we don't need them in the
- * URL protocol whitelisting system anyway.
- *
- * @param string $string
- * @return string
- */
-function kses_decode_entities($string)
-###############################################################################
-# This function decodes numeric HTML entities (A and A). It doesn't
-# do anything with other entities like ä, 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
-
-?>
*/
define('URL_MATCH_EXACT', 2);
-/**
- * Allowed tags - string of html tags that can be tested against for safe html tags
- * @global string $ALLOWED_TAGS
- * @name $ALLOWED_TAGS
- */
-global $ALLOWED_TAGS;
-$ALLOWED_TAGS =
-'<p><br><b><i><u><font><table><tbody><thead><tfoot><span><div><tr><td><th><ol><ul><dl><li><dt><dd><h1><h2><h3><h4><h5><h6><hr><img><a><strong><emphasis><em><sup><sub><address><cite><blockquote><pre><strike><param><acronym><nolink><lang><tex><algebra><math><mi><mn><mo><mtext><mspace><ms><mrow><mfrac><msqrt><mroot><mstyle><merror><mpadded><mphantom><mfenced><msub><msup><msubsup><munder><mover><munderover><mmultiscripts><mtable><mtr><mtd><maligngroup><malignmark><maction><cn><ci><apply><reln><fn><interval><inverse><sep><condition><declare><lambda><compose><ident><quotient><exp><factorial><divide><max><min><minus><plus><power><rem><times><root><gcd><and><or><xor><not><implies><forall><exists><abs><conjugate><eq><neq><gt><lt><geq><leq><ln><log><int><diff><partialdiff><lowlimit><uplimit><bvar><degree><set><list><union><intersect><in><notin><subset><prsubset><notsubset><notprsubset><setdiff><sum><product><limit><tendsto><mean><sdev><variance><median><mode><moment><vector><matrix><matrixrow><determinant><transpose><selector><annotation><semantics><annotation-xml><tt><code>';
-
-/**
- * Allowed protocols - array of protocols that are safe to use in links and so on
- * @global string $ALLOWED_PROTOCOLS
- */
-$ALLOWED_PROTOCOLS = array('http', 'https', 'ftp', 'news', 'mailto', 'rtsp', 'teamspeak', 'gopher', 'mms',
- 'color', 'callto', 'cursor', 'text-align', 'font-size', 'font-weight', 'font-style', 'font-family',
- 'border', 'border-bottom', 'border-left', 'border-top', 'border-right', 'margin', 'margin-bottom', 'margin-left', 'margin-top', 'margin-right',
- 'padding', 'padding-bottom', 'padding-left', 'padding-top', 'padding-right', 'vertical-align',
- 'background', 'background-color', 'text-decoration'); // CSS as well to get through kses
-
-
/// Functions
/**
return preg_replace('~(<a [^<]*href=["|\']?([^ "\']*)["|\']?[^>]*>([^<]*)</a>)~i','$3 [ $2 ]', $string);
}
-/**
- * Replaces non-standard HTML entities
- *
- * @param string $string
- * @return string
- */
-function fix_non_standard_entities($string) {
- $text = preg_replace('/�*([0-9]+);?/', '&#$1;', $string);
- $text = preg_replace('/�*([0-9a-fA-F]+);?/', '&#x$1;', $text);
- $text = preg_replace('[\x00-\x08\x0b-\x0c\x0e-\x1f]', '', $text);
- return $text;
-}
-
/**
* Given text in a variety of format codings, this function returns
* the text as plain text suitable for plain email.
/**
* Is trusttext feature active?
*
- * @global object
- * @param object $context
* @return bool
*/
function trusttext_active() {
* @return string The cleaned up text
*/
function clean_text($text, $format = FORMAT_HTML, $options = array()) {
- global $ALLOWED_TAGS, $CFG;
-
if (empty($text) or is_numeric($text)) {
return (string)$text;
}
return $text;
}
- if (!empty($CFG->enablehtmlpurifier)) {
- $text = purify_html($text, $options);
- } else {
- /// Fix non standard entity notations
- $text = fix_non_standard_entities($text);
-
- /// Remove tags that are not allowed
- $text = strip_tags($text, $ALLOWED_TAGS);
-
- /// Clean up embedded scripts and , using kses
- $text = cleanAttributes($text);
-
- /// Again remove tags that are not allowed
- $text = strip_tags($text, $ALLOWED_TAGS);
-
- }
+ $text = purify_html($text, $options);
// Remove potential script events - some extra protection for undiscovered bugs in our code
$text = preg_replace("~([^a-z])language([[:space:]]*)=~i", "$1Xlanguage=", $text);
/**
* KSES replacement cleaning function - uses HTML Purifier.
*
- * @global object
* @param string $text The (X)HTML string to purify
* @param array $options Array of options; currently only option supported is 'allowid' (if set,
* does not remove id attributes when cleaning)
+ * @return string
*/
function purify_html($text, $options = array()) {
global $CFG;
return $text;
}
-/**
- * This function takes a string and examines it for HTML tags.
- *
- * If tags are detected it passes the string to a helper function {@link cleanAttributes2()}
- * which checks for attributes and filters them for malicious content
- *
- * @param string $str The string to be examined for html tags
- * @return string
- */
-function cleanAttributes($str){
- $result = preg_replace_callback(
- '%(<[^>]*(>|$)|>)%m', #search for html tags
- "cleanAttributes2",
- $str
- );
- return $result;
-}
-
-/**
- * This function takes a string with an html tag and strips out any unallowed
- * protocols e.g. javascript:
- *
- * It calls ancillary functions in kses which are prefixed by kses
- *
- * @global object
- * @global string
- * @param array $htmlArray An array from {@link cleanAttributes()}, containing in its 1st
- * element the html to be cleared
- * @return string
- */
-function cleanAttributes2($htmlArray){
-
- global $CFG, $ALLOWED_PROTOCOLS;
- require_once($CFG->libdir .'/kses.php');
-
- $htmlTag = $htmlArray[1];
- if (substr($htmlTag, 0, 1) != '<') {
- return '>'; //a single character ">" detected
- }
- if (!preg_match('%^<\s*(/\s*)?([a-zA-Z0-9]+)([^>]*)>?$%', $htmlTag, $matches)) {
- return ''; // It's seriously malformed
- }
- $slash = trim($matches[1]); //trailing xhtml slash
- $elem = $matches[2]; //the element name
- $attrlist = $matches[3]; // the list of attributes as a string
-
- $attrArray = kses_hair($attrlist, $ALLOWED_PROTOCOLS);
-
- $attStr = '';
- foreach ($attrArray as $arreach) {
- $arreach['name'] = strtolower($arreach['name']);
- if ($arreach['name'] == 'style') {
- $value = $arreach['value'];
- while (true) {
- $prevvalue = $value;
- $value = kses_no_null($value);
- $value = preg_replace("/\/\*.*\*\//Us", '', $value);
- $value = kses_decode_entities($value);
- $value = preg_replace('/(&#[0-9]+)(;?)/', "\\1;", $value);
- $value = preg_replace('/(&#x[0-9a-fA-F]+)(;?)/', "\\1;", $value);
- if ($value === $prevvalue) {
- $arreach['value'] = $value;
- break;
- }
- }
- $arreach['value'] = preg_replace("/j\s*a\s*v\s*a\s*s\s*c\s*r\s*i\s*p\s*t/i", "Xjavascript", $arreach['value']);
- $arreach['value'] = preg_replace("/v\s*b\s*s\s*c\s*r\s*i\s*p\s*t/i", "Xvbscript", $arreach['value']);
- $arreach['value'] = preg_replace("/e\s*x\s*p\s*r\s*e\s*s\s*s\s*i\s*o\s*n/i", "Xexpression", $arreach['value']);
- $arreach['value'] = preg_replace("/b\s*i\s*n\s*d\s*i\s*n\s*g/i", "Xbinding", $arreach['value']);
- } else if ($arreach['name'] == 'href') {
- //Adobe Acrobat Reader XSS protection
- $arreach['value'] = preg_replace('/(\.(pdf|fdf|xfdf|xdp|xfd)[^#]*)#.*$/i', '$1', $arreach['value']);
- }
- $attStr .= ' '.$arreach['name'].'="'.$arreach['value'].'"';
- }
-
- $xhtml_slash = '';
- if (preg_match('%/\s*$%', $attrlist)) {
- $xhtml_slash = ' /';
- }
- return '<'. $slash . $elem . $attStr . $xhtml_slash .'>';
-}
-
/**
* Given plain text, makes it into HTML as nicely as possible.
* May contain HTML tags already
* by {@see format_text()} to convert FORMAT_MOODLE to HTML. You are supposed
* to call format_text() in most of cases.
*
- * @global object
* @param string $text The string to convert.
* @param boolean $smiley_ignored Was used to determine if smiley characters should convert to smiley images, ignored now
* @param boolean $para If true then the returned string will be wrapped in div tags
*/
function text_to_html($text, $smiley_ignored=null, $para=true, $newlines=true) {
- global $CFG;
-
/// Remove any whitespace that may be between HTML tags
$text = preg_replace("~>([[:space:]]+)<~i", "><", $text);
die;
}
-/**
- * Adjust the list of allowed tags based on $CFG->allowobjectembed and user roles (admin)
- *
- * @global object
- * @global string
- * @return void
- */
-function adjust_allowed_tags() {
-
- global $CFG, $ALLOWED_TAGS;
-
- if (!empty($CFG->allowobjectembed)) {
- $ALLOWED_TAGS .= '<embed><object>';
- }
-}
-
/**
* A class for tabs, Some code to print tabs
*
