diff options
Diffstat (limited to 'mod/kses/vendors/kses/oop/php4.class.kses.php')
| -rw-r--r-- | mod/kses/vendors/kses/oop/php4.class.kses.php | 1162 |
1 files changed, 1162 insertions, 0 deletions
diff --git a/mod/kses/vendors/kses/oop/php4.class.kses.php b/mod/kses/vendors/kses/oop/php4.class.kses.php new file mode 100644 index 000000000..acb06cc59 --- /dev/null +++ b/mod/kses/vendors/kses/oop/php4.class.kses.php @@ -0,0 +1,1162 @@ +<?php
+ /*
+ * ==========================================================================================
+ *
+ * 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
+ *
+ * ==========================================================================================
+ */
+
+ /**
+ * Class file for PHP4 OOP version of kses
+ *
+ * This is an updated version of kses to work with PHP4 that works under E_STRICT.
+ *
+ * This upgrade provides the following:
+ * + Version number synced to procedural version number
+ * + PHPdoc style documentation has been added to the class. See http://www.phpdoc.org/ for more info.
+ * + Some methods are now deprecated due to nomenclature style change. See method documentation for specifics.
+ * + Kses4 now works in E_STRICT
+ * + Addition of methods AddProtocols(), filterKsestextHook(), RemoveProtocol() and RemoveProtocols()
+ * + Deprecated _hook(), Protocols()
+ * + Integrated code from kses 0.2.2 into class.
+ * + Added methods DumpProtocols(), DumpMethods()
+ *
+ * @package kses
+ * @subpackage kses4
+ */
+
+ if(substr(phpversion(), 0, 1) < 4)
+ {
+ die("Class kses requires PHP 4 or higher.");
+ }
+
+ /**
+ * Only install KSES4 once
+ */
+ if(!defined('KSES_CLASS_PHP4'))
+ {
+ define('KSES_CLASS_PHP4', true);
+
+ /**
+ * Kses strips evil scripts!
+ *
+ * This class provides the capability for removing unwanted HTML/XHTML, attributes from
+ * tags, and protocols contained in links. The net result is a much more powerful tool
+ * than the PHP internal strip_tags()
+ *
+ * This is a fork of a slick piece of procedural code called 'kses' written by Ulf Harnhammar
+ * The entire set of functions was wrapped in a PHP object with some internal modifications
+ * by Richard Vasquez (http://www.chaos.org/) 7/25/2003
+ *
+ * This upgrade provides the following:
+ * + Version number synced to procedural version number
+ * + PHPdoc style documentation has been added to the class. See http://www.phpdoc.org/ for more info.
+ * + Some methods are now deprecated due to nomenclature style change. See method documentation for specifics.
+ * + Kses4 now works in E_STRICT
+ * + Addition of methods AddProtocols(), filterKsestextHook(), RemoveProtocol(), RemoveProtocols() and SetProtocols()
+ * + Deprecated _hook(), Protocols()
+ * + Integrated code from kses 0.2.2 into class.
+ *
+ * @author Richard R. Vásquez, Jr. (Original procedural code by Ulf Härnhammar)
+ * @link http://sourceforge.net/projects/kses/ Home Page for Kses
+ * @link http://chaos.org/contact/ Contact page with current email address for Richard Vasquez
+ * @copyright Richard R. Vásquez, Jr. 2003-2005
+ * @version PHP4 OOP 0.2.2
+ * @license http://www.gnu.org/licenses/gpl.html GNU Public License
+ * @package kses
+ */
+ class kses4
+ {
+ /**#@+
+ * @access private
+ * @var array
+ */
+ var $allowed_protocols = array();
+ var $allowed_html = array();
+ /**#@-*/
+
+ /**
+ * Constructor for kses.
+ *
+ * This sets a default collection of protocols allowed in links, and creates an
+ * empty set of allowed HTML tags.
+ * @since PHP4 OOP 0.0.1
+ */
+ function kses4()
+ {
+ /**
+ * You could add protocols such as ftp, new, gopher, mailto, irc, etc.
+ *
+ * The base values the original kses provided were:
+ * 'http', 'https', 'ftp', 'news', 'nntp', 'telnet', 'gopher', 'mailto'
+ */
+ $this->allowed_protocols = array('http', 'ftp', 'mailto');
+ $this->allowed_html = array();
+ }
+
+ /**
+ * Basic task of kses - parses $string and strips it as required.
+ *
+ * This method strips all the disallowed (X)HTML tags, attributes
+ * and protocols from the input $string.
+ *
+ * @access public
+ * @param string $string String to be stripped of 'evil scripts'
+ * @return string The stripped string
+ * @since PHP4 OOP 0.2.1
+ */
+ function Parse($string = "")
+ {
+ if (get_magic_quotes_gpc())
+ {
+ $string = stripslashes($string);
+ }
+ $string = $this->_no_null($string);
+ $string = $this->_js_entities($string);
+ $string = $this->_normalize_entities($string);
+ $string = $this->filterKsesTextHook($string);
+ return $this->_split($string);
+ }
+
+ /**
+ * Allows for single/batch addition of protocols
+ *
+ * This method accepts one argument that can be either a string
+ * or an array of strings. Invalid data will be ignored.
+ *
+ * The argument will be processed, and each string will be added
+ * via AddProtocol().
+ *
+ * @access public
+ * @param mixed , A string or array of protocols that will be added to the internal list of allowed protocols.
+ * @return bool Status of adding valid protocols.
+ * @see AddProtocol()
+ * @since PHP4 OOP 0.2.1
+ */
+ function AddProtocols()
+ {
+ $c_args = func_num_args();
+ if($c_args != 1)
+ {
+ trigger_error("kses4::AddProtocols() did not receive an argument.", E_USER_WARNING);
+ return false;
+ }
+
+ $protocol_data = func_get_arg(0);
+
+ if(is_array($protocol_data) && count($protocol_data) > 0)
+ {
+ foreach($protocol_data as $protocol)
+ {
+ $this->AddProtocol($protocol);
+ }
+ return true;
+ }
+ elseif(is_string($protocol_data))
+ {
+ $this->AddProtocol($protocol_data);
+ return true;
+ }
+ else
+ {
+ trigger_error("kses4::AddProtocols() did not receive a string or an array.", E_USER_WARNING);
+ return false;
+ }
+ }
+
+ /**
+ * Allows for single/batch addition of protocols
+ *
+ * @deprecated Use AddProtocols()
+ * @see AddProtocols()
+ * @return bool
+ * @since PHP4 OOP 0.0.1
+ */
+ function Protocols()
+ {
+ $c_args = func_num_args();
+ if($c_args != 1)
+ {
+ trigger_error("kses4::Protocols() did not receive an argument.", E_USER_WARNING);
+ return false;
+ }
+
+ return $this->AddProtocols(func_get_arg(0));
+ }
+
+ /**
+ * Adds a single protocol to $this->allowed_protocols.
+ *
+ * This method accepts a string argument and adds it to
+ * the list of allowed protocols to keep when performing
+ * Parse().
+ *
+ * @access public
+ * @param string $protocol The name of the protocol to be added.
+ * @return bool Status of adding valid protocol.
+ * @since PHP4 OOP 0.0.1
+ */
+ function AddProtocol($protocol = "")
+ {
+ if(!is_string($protocol))
+ {
+ trigger_error("kses4::AddProtocol() requires a string.", E_USER_WARNING);
+ return false;
+ }
+
+ $protocol = strtolower(trim($protocol));
+ if($protocol == "")
+ {
+ trigger_error("kses4::AddProtocol() tried to add an empty/NULL protocol.", E_USER_WARNING);
+ return false;
+ }
+
+ // Remove any inadvertent ':' at the end of the protocol.
+ if(substr($protocol, strlen($protocol) - 1, 1) == ":")
+ {
+ $protocol = substr($protocol, 0, strlen($protocol) - 1);
+ }
+
+ if(!in_array($protocol, $this->allowed_protocols))
+ {
+ array_push($this->allowed_protocols, $protocol);
+ sort($this->allowed_protocols);
+ }
+ return true;
+ }
+
+ /**
+ * Allows for single/batch replacement of protocols
+ *
+ * This method accepts one argument that can be either a string
+ * or an array of strings. Invalid data will be ignored.
+ *
+ * Existing protocols will be removed, then the argument will be
+ * processed, and each string will be added via AddProtocol().
+ *
+ * @access public
+ * @param mixed , A string or array of protocols that will be the new internal list of allowed protocols.
+ * @return bool Status of replacing valid protocols.
+ * @since PHP4 OOP 0.2.2
+ * @see AddProtocol()
+ */
+ function SetProtocols()
+ {
+ $c_args = func_num_args();
+ if($c_args != 1)
+ {
+ trigger_error("kses4::SetProtocols() did not receive an argument.", E_USER_WARNING);
+ return false;
+ }
+
+ $protocol_data = func_get_arg(0);
+
+ if(is_array($protocol_data) && count($protocol_data) > 0)
+ {
+ $this->allowed_protocols = array();
+ foreach($protocol_data as $protocol)
+ {
+ $this->AddProtocol($protocol);
+ }
+ return true;
+ }
+ elseif(is_string($protocol_data))
+ {
+ $this->allowed_protocols = array();
+ $this->AddProtocol($protocol_data);
+ return true;
+ }
+ else
+ {
+ trigger_error("kses4::SetProtocols() did not receive a string or an array.", E_USER_WARNING);
+ return false;
+ }
+ }
+
+ /**
+ * Raw dump of allowed protocols
+ *
+ * This returns an indexed array of allowed protocols for a particular KSES
+ * instantiation.
+ *
+ * @access public
+ * @return array The list of allowed protocols.
+ * @since PHP4 OOP 0.2.2
+ */
+ function DumpProtocols()
+ {
+ return $this->allowed_protocols;
+ }
+
+ /**
+ * Raw dump of allowed (X)HTML elements
+ *
+ * This returns an indexed array of allowed (X)HTML elements and attributes
+ * for a particular KSES instantiation.
+ *
+ * @access public
+ * @return array The list of allowed elements.
+ * @since PHP4 OOP 0.2.2
+ */
+ function DumpElements()
+ {
+ return $this->allowed_html;
+ }
+
+ /**
+ * Adds valid (X)HTML with corresponding attributes that will be kept when stripping 'evil scripts'.
+ *
+ * This method accepts one argument that can be either a string
+ * or an array of strings. Invalid data will be ignored.
+ *
+ * @access public
+ * @param string $tag (X)HTML tag that will be allowed after stripping text.
+ * @param array $attribs Associative array of allowed attributes - key => attribute name - value => attribute parameter
+ * @return bool Status of Adding (X)HTML and attributes.
+ * @since PHP4 OOP 0.0.1
+ */
+ function AddHTML($tag = "", $attribs = array())
+ {
+ if(!is_string($tag))
+ {
+ trigger_error("kses4::AddHTML() requires the tag to be a string", E_USER_WARNING);
+ return false;
+ }
+
+ $tag = strtolower(trim($tag));
+ if($tag == "")
+ {
+ trigger_error("kses4::AddHTML() tried to add an empty/NULL tag", E_USER_WARNING);
+ return false;
+ }
+
+ if(!is_array($attribs))
+ {
+ trigger_error("kses4::AddHTML() requires an array (even an empty one) of attributes for '$tag'", E_USER_WARNING);
+ return false;
+ }
+
+ $new_attribs = array();
+ if(is_array($attribs) && count($attribs) > 0)
+ {
+ foreach($attribs as $idx1 => $val1)
+ {
+ $new_idx1 = strtolower($idx1);
+ $new_val1 = $attribs[$idx1];
+
+ if(is_array($new_val1) && count($new_val1) > 0)
+ {
+ $tmp_val = array();
+ foreach($new_val1 as $idx2 => $val2)
+ {
+ $new_idx2 = strtolower($idx2);
+ $tmp_val[$new_idx2] = $val2;
+ }
+ $new_val1 = $tmp_val;
+ }
+
+ $new_attribs[$new_idx1] = $new_val1;
+ }
+ }
+
+ $this->allowed_html[$tag] = $new_attribs;
+ return true;
+ }
+
+ /**
+ * Removes a single protocol from $this->allowed_protocols.
+ *
+ * This method accepts a string argument and removes it from
+ * the list of allowed protocols to keep when performing
+ * Parse().
+ *
+ * @access public
+ * @param string $protocol The name of the protocol to be removed.
+ * @return bool Status of removing valid protocol.
+ * @since PHP4 OOP 0.2.1
+ */
+ function RemoveProtocol($protocol = "")
+ {
+ if(!is_string($protocol))
+ {
+ trigger_error("kses4::RemoveProtocol() requires a string.", E_USER_WARNING);
+ return false;
+ }
+
+ // Remove any inadvertent ':' at the end of the protocol.
+ if(substr($protocol, strlen($protocol) - 1, 1) == ":")
+ {
+ $protocol = substr($protocol, 0, strlen($protocol) - 1);
+ }
+
+ $protocol = strtolower(trim($protocol));
+ if($protocol == "")
+ {
+ trigger_error("kses4::RemoveProtocol() tried to remove an empty/NULL protocol.", E_USER_WARNING);
+ return false;
+ }
+
+ // Ensures that the protocol exists before removing it.
+ if(in_array($protocol, $this->allowed_protocols))
+ {
+ $this->allowed_protocols = array_diff($this->allowed_protocols, array($protocol));
+ sort($this->allowed_protocols);
+ }
+
+ return true;
+ }
+
+ /**
+ * Allows for single/batch removal of protocols
+ *
+ * This method accepts one argument that can be either a string
+ * or an array of strings. Invalid data will be ignored.
+ *
+ * The argument will be processed, and each string will be removed
+ * via RemoveProtocol().
+ *
+ * @access public
+ * @param mixed , A string or array of protocols that will be removed from the internal list of allowed protocols.
+ * @return bool Status of removing valid protocols.
+ * @see RemoveProtocol()
+ * @since PHP5 OOP 0.2.1
+ */
+ function RemoveProtocols()
+ {
+ $c_args = func_num_args();
+ if($c_args != 1)
+ {
+ return false;
+ }
+
+ $protocol_data = func_get_arg(0);
+
+ if(is_array($protocol_data) && count($protocol_data) > 0)
+ {
+ foreach($protocol_data as $protocol)
+ {
+ $this->RemoveProtocol($protocol);
+ }
+ }
+ elseif(is_string($protocol_data))
+ {
+ $this->RemoveProtocol($protocol_data);
+ return true;
+ }
+ else
+ {
+ trigger_error("kses4::RemoveProtocols() did not receive a string or an array.", E_USER_WARNING);
+ return false;
+ }
+ }
+
+ /**
+ * This method removes any NULL or characters in $string.
+ *
+ * @access private
+ * @param string $string
+ * @return string String without any NULL/chr(173)
+ * @since PHP4 OOP 0.0.1
+ */
+ function _no_null($string)
+ {
+ $string = preg_replace('/\0+/', '', $string);
+ $string = preg_replace('/(\\\\0)+/', '', $string);
+ return $string;
+ }
+
+ /**
+ * This function removes the HTML JavaScript entities found in early versions of
+ * Netscape 4.
+ *
+ * @access private
+ * @param string $string
+ * @return string String without any NULL/chr(173)
+ * @since PHP4 OOP 0.0.1
+ */
+ function _js_entities($string)
+ {
+ return preg_replace('%&\s*\{[^}]*(\}\s*;?|$)%', '', $string);
+ }
+
+ /**
+ * Normalizes HTML entities
+ *
+ * This function normalizes HTML entities. It will convert "AT&T" to the correct
+ * "AT&T", ":" to ":", "&#XYZZY;" to "&#XYZZY;" and so on.
+ *
+ * @access private
+ * @param string $string
+ * @return string String with normalized entities
+ * @since PHP4 OOP 0.0.1
+ */
+ function _normalize_entities($string)
+ {
+ # Disarm all entities by converting & to &
+ $string = str_replace('&', '&', $string);
+
+ # Change back the allowed entities in our entity white list
+
+ $string = preg_replace('/&([A-Za-z][A-Za-z0-9]{0,19});/', '&\\1;', $string);
+ $string = preg_replace('/&#0*([0-9]{1,5});/e', '\$this->_normalize_entities2("\\1")', $string);
+ $string = preg_replace('/&#([Xx])0*(([0-9A-Fa-f]{2}){1,2});/', '&#\\1\\2;', $string);
+
+ return $string;
+ }
+
+ /**
+ * Helper method used by normalizeEntites()
+ *
+ * This method helps normalizeEntities() to only accept 16 bit values
+ * and nothing more for &#number; entities.
+ *
+ * This method helps normalize_entities() during a preg_replace()
+ * where a &#(0)*XXXXX; occurs. The '(0)*XXXXXX' value is converted to
+ * a number and the result is returned as a numeric entity if the number
+ * is less than 65536. Otherwise, the value is returned 'as is'.
+ *
+ * @access private
+ * @param string $i
+ * @return string Normalized numeric entity
+ * @see _normalize_entities()
+ * @since PHP4 OOP 0.0.1
+ */
+ function _normalize_entities2($i)
+ {
+ return (($i > 65535) ? "&#$i;" : "&#$i;");
+ }
+
+ /**
+ * Allows for additional user defined modifications to text.
+ *
+ * @deprecated use filterKsesTextHook()
+ * @param string $string
+ * @see filterKsesTextHook()
+ * @return string
+ * @since PHP4 OOP 0.0.1
+ */
+ function _hook($string)
+ {
+ return $this->filterKsesTextHook($string);
+ }
+
+ /**
+ * Allows for additional user defined modifications to text.
+ *
+ * This method allows for additional modifications to be performed on
+ * a string that's being run through Parse(). Currently, it returns the
+ * input string 'as is'.
+ *
+ * This method is provided for users to extend the kses class for their own
+ * requirements.
+ *
+ * @access public
+ * @param string $string String to perfrom additional modifications on.
+ * @return string User modified string.
+ * @see Parse()
+ * @since PHP5 OOP 1.0.0
+ */
+ function filterKsesTextHook($string)
+ {
+ return $string;
+ }
+
+ /**
+ * This method goes through an array, and changes the keys to all lower case.
+ *
+ * @access private
+ * @param array $in_array Associative array
+ * @return array Modified array
+ * @since PHP4 OOP 0.0.1
+ */
+ function _array_lc($inarray)
+ {
+ $outarray = array();
+
+ if(is_array($inarray) && count($inarray) > 0)
+ {
+ foreach ($inarray as $inkey => $inval)
+ {
+ $outkey = strtolower($inkey);
+ $outarray[$outkey] = array();
+
+ if(is_array($inval) && count($inval) > 0)
+ {
+ foreach ($inval as $inkey2 => $inval2)
+ {
+ $outkey2 = strtolower($inkey2);
+ $outarray[$outkey][$outkey2] = $inval2;
+ }
+ }
+ }
+ }
+
+ return $outarray;
+ }
+
+ /**
+ * This method searched for HTML tags, no matter how malformed. It also
+ * matches stray ">" characters.
+ *
+ * @access private
+ * @param string $string
+ * @return string HTML tags
+ * @since PHP4 OOP 0.0.1
+ */
+ function _split($string)
+ {
+ return preg_replace(
+ '%(<'. # EITHER: <
+ '[^>]*'. # things that aren't >
+ '(>|$)'. # > or end of string
+ '|>)%e', # OR: just a >
+ "\$this->_split2('\\1')",
+ $string);
+ }
+
+ /**
+ * This method strips out disallowed and/or mangled (X)HTML tags along with assigned attributes.
+ *
+ * This method 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
+ * allowed attribute list.
+ *
+ * @access private
+ * @param string $string
+ * @return string Modified string minus disallowed/mangled (X)HTML and attributes
+ * @since PHP4 OOP 0.0.1
+ */
+ function _split2($string)
+ {
+ $string = $this->_stripslashes($string);
+
+ if (substr($string, 0, 1) != '<')
+ {
+ # It matched a ">" character
+ return '>';
+ }
+
+ if (!preg_match('%^<\s*(/\s*)?([a-zA-Z0-9]+)([^>]*)>?$%', $string, $matches))
+ {
+ # It's seriously malformed
+ return '';
+ }
+
+ $slash = trim($matches[1]);
+ $elem = $matches[2];
+ $attrlist = $matches[3];
+
+ if (
+ !isset($this->allowed_html[strtolower($elem)]) ||
+ !is_array($this->allowed_html[strtolower($elem)])
+ )
+ {
+ # They are using a not allowed HTML element
+ return '';
+ }
+
+ if ($slash != '')
+ {
+ return "<$slash$elem>";
+ }
+ # No attributes are allowed for closing elements
+
+ return $this->_attr("$slash$elem", $attrlist);
+ }
+
+ /**
+ * This method strips out disallowed attributes for (X)HTML tags.
+ *
+ * This method removes all attributes if none are allowed for this element.
+ * If some are allowed it calls $this->_hair() to split them further, and then it
+ * builds up new HTML code from the data that $this->_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.
+ *
+ * @access private
+ * @param string $element (X)HTML tag to check
+ * @param string $attr Text containing attributes to check for validity.
+ * @return string Resulting valid (X)HTML or ''
+ * @see _hair()
+ * @since PHP4 OOP 0.0.1
+ */
+ function _attr($element, $attr)
+ {
+ # Is there a closing XHTML slash at the end of the attributes?
+ $xhtml_slash = '';
+ if (preg_match('%\s/\s*$%', $attr))
+ {
+ $xhtml_slash = ' /';
+ }
+
+ # Are any attributes allowed at all for this element?
+ if (
+ !isset($this->allowed_html[strtolower($element)]) ||
+ count($this->allowed_html[strtolower($element)]) == 0
+ )
+ {
+ return "<$element$xhtml_slash>";
+ }
+
+ # Split it
+ $attrarr = $this->_hair($attr);
+
+ # Go through $attrarr, and save the allowed attributes for this element
+ # in $attr2
+ $attr2 = '';
+ if(is_array($attrarr) && count($attrarr) > 0)
+ {
+ foreach ($attrarr as $arreach)
+ {
+ if(!isset($this->allowed_html[strtolower($element)][strtolower($arreach['name'])]))
+ {
+ continue;
+ }
+
+ $current = $this->allowed_html[strtolower($element)][strtolower($arreach['name'])];
+ if ($current == '')
+ {
+ # the attribute is not allowed
+ continue;
+ }
+
+ if (!is_array($current))
+ {
+ # there are no checks
+ $attr2 .= ' '.$arreach['whole'];
+ }
+ else
+ {
+ # there are some checks
+ $ok = true;
+ if(is_array($current) && count($current) > 0)
+ {
+ foreach ($current as $currkey => $currval)
+ {
+ if (!$this->_check_attr_val($arreach['value'], $arreach['vless'], $currkey, $currval))
+ {
+ $ok = false;
+ break;
+ }
+ }
+
+ if ($ok)
+ {
+ # it passed them
+ $attr2 .= ' '.$arreach['whole'];
+ }
+ }
+ }
+ }
+ }
+
+ # Remove any "<" or ">" characters
+ $attr2 = preg_replace('/[<>]/', '', $attr2);
+ return "<$element$attr2$xhtml_slash>";
+ }
+
+ /**
+ * This method combs through an attribute list string and returns an associative array of attributes and values.
+ *
+ * This method 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.
+ *
+ * @access private
+ * @param string $attr Text containing tag attributes for parsing
+ * @return array Associative array containing data on attribute and value
+ * @since PHP4 OOP 0.0.1
+ */
+ function _hair($attr)
+ {
+ $attrarr = array();
+ $mode = 0;
+ $attrname = '';
+
+ # Loop through the whole attribute list
+
+ while (strlen($attr) != 0)
+ {
+ # Was the last operation successful?
+ $working = 0;
+
+ switch ($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 = $this->_bad_protocol($match[1]);
+ $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 = $this->_bad_protocol($match[1]);
+ $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 = $this->_bad_protocol($match[1]);
+ $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;
+ $attr = preg_replace("%^[^\s\"']+(\s+|$)%", '', $attr);
+ }
+ break;
+ }
+
+ if ($working == 0) # not well formed, remove and try again
+ {
+ $attr = $this->_html_error($attr);
+ $mode = 0;
+ }
+ }
+
+ # special case, for when the attribute list ends with a valueless
+ # attribute like "selected"
+ if ($mode == 1)
+ {
+ $attrarr[] = array(
+ 'name' => $attrname,
+ 'value' => '',
+ 'whole' => $attrname,
+ 'vless' => 'y'
+ );
+ }
+
+ return $attrarr;
+ }
+
+ /**
+ * This method removes disallowed protocols.
+ *
+ * This method 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)".
+ *
+ * @access private
+ * @param string $string String to check for protocols
+ * @return string String with removed protocols
+ * @since PHP4 OOP 0.0.1
+ */
+ function _bad_protocol($string)
+ {
+ $string = $this->_no_null($string);
+ $string = preg_replace('/\xad+/', '', $string); # deals with Opera "feature"
+ $string2 = $string.'a';
+
+ while ($string != $string2)
+ {
+ $string2 = $string;
+ $string = $this->_bad_protocol_once($string);
+ } # while
+
+ return $string;
+ }
+
+ /**
+ * Helper method used by _bad_protocol()
+ *
+ * This function searches for URL protocols at the beginning of $string, while
+ * handling whitespace and HTML entities.
+ *
+ * @access private
+ * @param string $string String to check for protocols
+ * @return string String with removed protocols
+ * @see _bad_protocol()
+ * @since PHP4 OOP 0.0.1
+ */
+ function _bad_protocol_once($string)
+ {
+ return preg_replace(
+ '/^((&[^;]*;|[\sA-Za-z0-9])*)'.
+ '(:|:|&#[Xx]3[Aa];)\s*/e',
+ '\$this->_bad_protocol_once2("\\1")',
+ $string
+ );
+ }
+
+ /**
+ * Helper method used by _bad_protocol_once() regex
+ *
+ * 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.
+ *
+ * @access private
+ * @param string $string String to check for protocols
+ * @return string String with removed protocols
+ * @see _bad_protocol()
+ * @see _bad_protocol_once()
+ * @since PHP4 OOP 0.0.1
+ */
+ function _bad_protocol_once2($string)
+ {
+ $string = $this->_decode_entities($string);
+ $string = preg_replace('/\s/', '', $string);
+ $string = $this->_no_null($string);
+ $string = preg_replace('/\xad+/', '', $string); # deals with Opera "feature"
+ $string = strtolower($string);
+
+ $allowed = false;
+ if(is_array($this->allowed_protocols) && count($this->allowed_protocols) > 0)
+ {
+ foreach ($this->allowed_protocols as $one_protocol)
+ {
+ if (strtolower($one_protocol) == $string)
+ {
+ $allowed = true;
+ break;
+ }
+ }
+ }
+
+ if ($allowed)
+ {
+ return "$string:";
+ }
+ else
+ {
+ return '';
+ }
+ }
+
+ /**
+ * 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.
+ *
+ * @access private
+ * @param string $value The value of the attribute to be checked.
+ * @param string $vless Indicates whether the the value is supposed to be valueless
+ * @param string $checkname The check to be performed
+ * @param string $checkvalue The value that is to be checked against
+ * @return bool Indicates whether the check passed or not
+ * @since PHP4 OOP 0.0.1
+ */
+ function _check_attr_val($value, $vless, $checkname, $checkvalue)
+ {
+ $ok = true;
+
+ switch (strtolower($checkname))
+ {
+ /**
+ * 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.
+ */
+ case 'maxlen':
+ if (strlen($value) > $checkvalue)
+ {
+ $ok = false;
+ }
+ break;
+
+ /**
+ * The minlen check makes sure that the attribute value has a length not
+ * smaller than the given value.
+ */
+ case 'minlen':
+ if (strlen($value) < $checkvalue)
+ {
+ $ok = false;
+ }
+ break;
+
+ /**
+ * The maxval check does two things: it checks that the attribute value is
+ * an integer from 0 and up, without an excessive amount of zeroes or
+ * whitespace (to avoid Buffer Overflows). It also checks that the attribute
+ * value is not greater than the given value.
+ * This check can be used to avoid Denial of Service attacks.
+ */
+ case 'maxval':
+ if (!preg_match('/^\s{0,6}[0-9]{1,6}\s{0,6}$/', $value))
+ {
+ $ok = false;
+ }
+ if ($value > $checkvalue)
+ {
+ $ok = false;
+ }
+ break;
+
+ /**
+ * The minval check checks that the attribute value is a positive integer,
+ * and that it is not smaller than the given value.
+ */
+ case 'minval':
+ if (!preg_match('/^\s{0,6}[0-9]{1,6}\s{0,6}$/', $value))
+ {
+ $ok = false;
+ }
+ if ($value < $checkvalue)
+ {
+ $ok = false;
+ }
+ break;
+
+ /**
+ * The valueless check checks if the attribute has a value
+ * (like <a href="blah">) or not (<option selected>). If the given value
+ * is a "y" or a "Y", the attribute must not have a value.
+ * If the given value is an "n" or an "N", the attribute must have one.
+ */
+ case 'valueless':
+ if (strtolower($checkvalue) != $vless)
+ {
+ $ok = false;
+ }
+ break;
+
+ }
+
+ return $ok;
+ }
+
+ /**
+ * Changes \" to "
+ *
+ * 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.
+ *
+ * @access private
+ * @param string $string The string to be stripped.
+ * @return string string stripped of \"
+ * @since PHP4 OOP 0.0.1
+ */
+ function _stripslashes($string)
+ {
+ return preg_replace('%\\\\"%', '"', $string);
+ }
+
+ /**
+ * helper method for _hair()
+ *
+ * This function deals with parsing errors in _hair(). The general plan is
+ * to remove everything to and including some whitespace, but it deals with
+ * quotes and apostrophes as well.
+ *
+ * @access private
+ * @param string $string The string to be stripped.
+ * @return string string stripped of whitespace
+ * @see _hair()
+ * @since PHP4 OOP 0.0.1
+ */
+ function _html_error($string)
+ {
+ return preg_replace('/^("[^"]*("|$)|\'[^\']*(\'|$)|\S)*\s*/', '', $string);
+ }
+
+ /**
+ * Decodes numeric HTML entities
+ *
+ * This method 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 white listing system anyway.
+ *
+ * @access private
+ * @param string $value The entitiy to be decoded.
+ * @return string Decoded entity
+ * @since PHP4 OOP 0.0.1
+ */
+ function _decode_entities($string)
+ {
+ $string = preg_replace('/&#([0-9]+);/e', 'chr("\\1")', $string);
+ $string = preg_replace('/&#[Xx]([0-9A-Fa-f]+);/e', 'chr(hexdec("\\1"))', $string);
+ return $string;
+ }
+
+ /**
+ * Returns PHP4 OOP version # of kses.
+ *
+ * Since this class has been refactored and documented and proven to work,
+ * I'm syncing the version number to procedural kses.
+ *
+ * @access public
+ * @return string Version number
+ * @since PHP4 OOP 0.0.1
+ */
+ function _version()
+ {
+ return 'PHP4 0.2.2 (OOP fork of procedural kses 0.2.2)';
+ }
+ }
+
+
+
+ }
+?>
\ No newline at end of file |