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Diffstat (limited to 'vendors/kses/oop/php5.class.kses.php')
| -rw-r--r-- | vendors/kses/oop/php5.class.kses.php | 1172 |
1 files changed, 1172 insertions, 0 deletions
diff --git a/vendors/kses/oop/php5.class.kses.php b/vendors/kses/oop/php5.class.kses.php new file mode 100644 index 000000000..541f1bd1e --- /dev/null +++ b/vendors/kses/oop/php5.class.kses.php @@ -0,0 +1,1172 @@ +<?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 PHP5 OOP version of kses
+ *
+ * This is an updated version of kses to work with PHP5 that works under E_STRICT.
+ *
+ * This version is a bit of a rewrite to match my own coding style and use some of the
+ * capabilities allowed in PHP5. Since this was a significant rewrite, but it still
+ * maintains backward compatibility syntax-wise, the version number is now 1.0.0. Any
+ * minor changes that do not break compatibility will be indicated in the second or third
+ * digits. Anything that breaks compatibility will change the major version number.
+ *
+ * PHP5 specific changes:
+ * + Private methods are now in place
+ * + __construct() is now used rather then the standard class name 'kses()'
+ * + Kses will not load in any version less that PHP5
+ * Other modifications:
+ * + PHPdoc style documentation has been added to the class. See http://www.phpdoc.org/ for more info.
+ * + Method names have been changed to reflect status as verbs
+ * + One line methods have been folded into the code
+ * + Some methods are now deprecated due to nomenclature style change. See method documentation for specifics.
+ * + Kses5 now works in E_STRICT
+ * + Version number is 1.0.0 to reflect serious code changes
+ * + Addition of methods AddProtocols(), filterKsestextHook(), RemoveProtocol(), RemoveProtocols() and SetProtocols()
+ * + Deprecated _hook(), Protocols()
+ *
+ * @package kses
+ * @subpackage kses5
+ */
+
+ if(substr(phpversion(), 0, 1) < 5)
+ {
+ die("Class kses requires PHP 5 or higher.");
+ }
+
+ /**
+ * Only install KSES5 once
+ */
+ if(!defined('KSES_CLASS_PHP5'))
+ {
+ define('KSES_CLASS_PHP5', 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 original class for PHP4 was basically a wrapper around all of the functions in
+ * the procedural code written by Ulf, and was released 7/25/2003.
+ *
+ * This version is a bit of a rewrite to match my own coding style and use some of the
+ * capabilities allowed in PHP5. Since this was a significant rewrite, but it still
+ * maintains backward compatibility syntax-wise, the version number is now 1.0.0. Any
+ * minor changes that do not break compatibility will be indicated in the second or third
+ * digits. Anything that breaks compatibility will change the major version number.
+ *
+ * PHP5 specific changes:
+ * + Private methods are now in place
+ * + __construct() is now used rather then the standard class name 'kses()'
+ * + Kses5 will not load in any version less that PHP5
+ * Other modifications:
+ * + PHPdoc style documentation has been added to the class. See http://www.phpdoc.org/ for more info.
+ * + Method names have been changed to reflect status as verbs
+ * + One line methods have been folded into the code
+ * + Some methods are now deprecated due to nomenclature style change. See method documentation for specifics.
+ * + Kses now works in E_STRICT
+ * + Initial Version number set to 1.0.0 to reflect serious code changes
+ * + Addition of methods AddProtocols(), filterKsestextHook(), RemoveProtocol(), RemoveProtocols() and SetProtocols()
+ * + Deprecated _hook(), Protocols()
+ * + Integrated code from kses 0.2.2 into class.
+ * + Added methods DumpProtocols(), DumpMethods()
+ *
+ * @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. 2005
+ * @version PHP5 OOP 1.0.2
+ * @license http://www.gnu.org/licenses/gpl.html GNU Public License
+ * @package kses
+ */
+ class kses5
+ {
+ /**#@+
+ * @access private
+ * @var array
+ */
+ private $allowed_protocols;
+ private $allowed_html;
+ /**#@-*/
+
+ /**
+ * Constructor for kses.
+ *
+ * This sets a default collection of protocols allowed in links, and creates an
+ * empty set of allowed HTML tags.
+ * @since PHP5 OOP 1.0.0
+ */
+ public function __construct()
+ {
+ /**
+ * 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 $string String to be stripped of 'evil scripts'
+ * @return string The stripped string
+ * @since PHP4 OOP 0.0.1
+ */
+ public function Parse($string = "")
+ {
+ if (get_magic_quotes_gpc())
+ {
+ $string = stripslashes($string);
+ }
+ $string = $this->removeNulls($string);
+ // Remove JavaScript entities from early Netscape 4 versions
+ $string = preg_replace('%&\s*\{[^}]*(\}\s*;?|$)%', '', $string);
+ $string = $this->normalizeEntities($string);
+ $string = $this->filterKsesTextHook($string);
+ $string = preg_replace('%(<' . '[^>]*' . '(>|$)' . '|>)%e', "\$this->stripTags('\\1')", $string);
+ return $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 PHP5 OOP 1.0.0
+ */
+ public function AddProtocols()
+ {
+ $c_args = func_num_args();
+ if($c_args != 1)
+ {
+ trigger_error("kses5::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("kses5::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
+ */
+ public function Protocols()
+ {
+ $c_args = func_num_args();
+ if($c_args != 1)
+ {
+ trigger_error("kses5::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 $protocol The name of the protocol to be added.
+ * @return bool Status of adding valid protocol.
+ * @since PHP4 OOP 0.0.1
+ */
+ public function AddProtocol($protocol = "")
+ {
+ if(!is_string($protocol))
+ {
+ trigger_error("kses5::AddProtocol() requires a string.", E_USER_WARNING);
+ return false;
+ }
+
+ // Remove any inadvertent ':' at the end of the protocol.
+ if(substr($protocol, strlen($protocol) - 1, 1) == ":")
+ {
+ $protocol = substr($protocol, 0, strlen($protocol) - 1);
+ }
+
+ $protocol = strtolower(trim($protocol));
+ if($protocol == "")
+ {
+ trigger_error("kses5::AddProtocol() tried to add an empty/NULL protocol.", E_USER_WARNING);
+ return false;
+ }
+
+ // prevent duplicate protocols from being added.
+ if(!in_array($protocol, $this->allowed_protocols))
+ {
+ array_push($this->allowed_protocols, $protocol);
+ sort($this->allowed_protocols);
+ }
+ 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 $protocol The name of the protocol to be removed.
+ * @return bool Status of removing valid protocol.
+ * @since PHP5 OOP 1.0.0
+ */
+ public function RemoveProtocol($protocol = "")
+ {
+ if(!is_string($protocol))
+ {
+ trigger_error("kses5::RemoveProtocol() requires a string.", E_USER_WARNING);
+ return false;
+ }
+
+ // Remove any inadvertent ':' at the end of the protocol.
+ if(substr($protocol, strlen($protocol) - 1, 1) == ":")
+ {
+ $protocol = substr($protocol, 0, strlen($protocol) - 1);
+ }
+
+ $protocol = strtolower(trim($protocol));
+ if($protocol == "")
+ {
+ trigger_error("kses5::RemoveProtocol() tried to remove an empty/NULL protocol.", E_USER_WARNING);
+ return false;
+ }
+
+ // Ensures that the protocol exists before removing it.
+ if(in_array($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 1.0.0
+ */
+ public 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("kses5::RemoveProtocols() did not receive a string or an array.", E_USER_WARNING);
+ return false;
+ }
+ }
+
+ /**
+ * 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 PHP5 OOP 1.0.1
+ * @see AddProtocol()
+ */
+ public function SetProtocols()
+ {
+ $c_args = func_num_args();
+ if($c_args != 1)
+ {
+ trigger_error("kses5::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("kses5::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 PHP5 OOP 1.0.2
+ */
+ public 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 PHP5 OOP 1.0.2
+ */
+ public 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 $attribs Associative array of allowed attributes - key => attribute name - value => attribute parameter
+ * @return bool Status of Adding (X)HTML and attributes.
+ * @since PHP4 OOP 0.0.1
+ */
+ public function AddHTML($tag = "", $attribs = array())
+ {
+ if(!is_string($tag))
+ {
+ trigger_error("kses5::AddHTML() requires the tag to be a string", E_USER_WARNING);
+ return false;
+ }
+
+ $tag = strtolower(trim($tag));
+ if($tag == "")
+ {
+ trigger_error("kses5::AddHTML() tried to add an empty/NULL tag", E_USER_WARNING);
+ return false;
+ }
+
+ if(!is_array($attribs))
+ {
+ trigger_error("kses5::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($new_val1) && count($attribs) > 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;
+ }
+
+ /**
+ * This method removes any NULL characters in $string.
+ *
+ * @access private
+ * @param string $string
+ * @return string String without any NULL/chr(173)
+ * @since PHP4 OOP 0.0.1
+ */
+ private function removeNulls($string)
+ {
+ $string = preg_replace('/\0+/', '', $string);
+ $string = preg_replace('/(\\\\0)+/', '', $string);
+ return $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 $string
+ * @return string String with normalized entities
+ * @since PHP4 OOP 0.0.1
+ */
+ private function normalizeEntities($string)
+ {
+ # Disarm all entities by converting & to &
+ $string = str_replace('&', '&', $string);
+
+ # TODO: Change back (Keep?) the allowed entities in our entity white list
+
+ # Keeps entities that start with [A-Za-z]
+ $string = preg_replace(
+ '/&([A-Za-z][A-Za-z0-9]{0,19});/',
+ '&\\1;',
+ $string
+ );
+
+ # Change numeric entities to valid 16 bit values
+
+ $string = preg_replace(
+ '/&#0*([0-9]{1,5});/e',
+ '\$this->normalizeEntities16bit("\\1")',
+ $string
+ );
+
+ # Change &XHHHHHHH (Hex digits) to 16 bit hex values
+ $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 $i
+ * @return string Normalized numeric entity
+ * @see normalizeEntities()
+ * @since PHP4 OOP 0.0.1
+ */
+ private function normalizeEntities16bit($i)
+ {
+ return (($i > 65535) ? "&#$i;" : "&#$i;");
+ }
+
+ /**
+ * 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 $string String to perfrom additional modifications on.
+ * @return string User modified string.
+ * @see Parse()
+ * @since PHP5 OOP 1.0.0
+ */
+ private function filterKsesTextHook($string)
+ {
+ return $string;
+ }
+
+ /**
+ * Allows for additional user defined modifications to text.
+ *
+ * @deprecated use filterKsesTextHook()
+ * @param string $string
+ * @return string
+ * @see filterKsesTextHook()
+ * @since PHP4 OOP 0.0.1
+ */
+ private function _hook($string)
+ {
+ return $this->filterKsesTextHook($string);
+ }
+
+ /**
+ * This method goes through an array, and changes the keys to all lower case.
+ *
+ * @access private
+ * @param array $in_array Associative array
+ * @return array Modified array
+ * @since PHP4 OOP 0.0.1
+ */
+ private function makeArrayKeysLowerCase($in_array)
+ {
+ $out_array = array();
+
+ if(is_array($in_array) && count($in_array) > 0)
+ {
+ foreach ($in_array as $in_key => $in_val)
+ {
+ $out_key = strtolower($in_key);
+ $out_array[$out_key] = array();
+
+ if(is_array($in_val) && count($in_val) > 0)
+ {
+ foreach ($in_val as $in_key2 => $in_val2)
+ {
+ $out_key2 = strtolower($in_key2);
+ $out_array[$out_key][$out_key2] = $in_val2;
+ }
+ }
+ }
+ }
+
+ return $out_array;
+ }
+
+ /**
+ * 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 $string
+ * @return string Modified string minus disallowed/mangled (X)HTML and attributes
+ * @since PHP4 OOP 0.0.1
+ */
+ private function stripTags($string)
+ {
+ $string = preg_replace('%\\\\"%', '"', $string);
+
+ if (substr($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($elem)]))
+ {
+ # Found an HTML element not in the white list
+ return '';
+ }
+
+ if ($slash != '')
+ {
+ return "<$slash$elem>";
+ }
+ # No attributes are allowed for closing elements
+
+ return $this->stripAttributes("$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 combAttributes() to split them further, and then it
+ * builds up new HTML code from the data that combAttributes() 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 $attr Text containing attributes to check for validity.
+ * @return string Resulting valid (X)HTML or ''
+ * @see combAttributes()
+ * @since PHP4 OOP 0.0.1
+ */
+ private function stripAttributes($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 = $this->combAttributes($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($arreach['name'])];
+
+ if (!is_array($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->checkAttributeValue($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 $attr Text containing tag attributes for parsing
+ * @return array Associative array containing data on attribute and value
+ * @since PHP4 OOP 0.0.1
+ */
+ private function combAttributes($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 = $this->removeBadProtocols($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 = $this->removeBadProtocols($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 = $this->removeBadProtocols($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
+ {
+ $attr = preg_replace('/^("[^"]*("|$)|\'[^\']*(\'|$)|\S)*\s*/', '', $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 $string String to check for protocols
+ * @return string String with removed protocols
+ * @since PHP4 OOP 0.0.1
+ */
+ private function removeBadProtocols($string)
+ {
+ $string = $this->RemoveNulls($string);
+ $string = preg_replace('/\xad+/', '', $string); # deals with Opera "feature"
+ $string2 = $string . 'a';
+
+ while ($string != $string2)
+ {
+ $string2 = $string;
+ $string = preg_replace(
+ '/^((&[^;]*;|[\sA-Za-z0-9])*)'.
+ '(:|:|&#[Xx]3[Aa];)\s*/e',
+ '\$this->filterProtocols("\\1")',
+ $string
+ );
+ }
+
+ return $string;
+ }
+
+ /**
+ * Helper method used by removeBadProtocols()
+ *
+ * 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 $string String to check for protocols
+ * @return string String with removed protocols
+ * @see removeBadProtocols()
+ * @since PHP4 OOP 0.0.1
+ */
+ private function filterProtocols($string)
+ {
+ $string = $this->decodeEntities($string);
+ $string = preg_replace('/\s/', '', $string);
+ $string = $this->removeNulls($string);
+ $string = preg_replace('/\xad+/', '', $string2); # deals with Opera "feature"
+ $string = strtolower($string);
+
+ if(is_array($this->allowed_protocols) && count($this->allowed_protocols) > 0)
+ {
+ foreach ($this->allowed_protocols as $one_protocol)
+ {
+ if (strtolower($one_protocol) == $string)
+ {
+ return "$string:";
+ }
+ }
+ }
+
+ return '';
+ }
+
+ /**
+ * Controller method for performing checks on attribute values.
+ *
+ * This method calls the appropriate method as specified by $checkname with
+ * the parameters $value, $vless, and $checkvalue, and returns the result
+ * of the call.
+ *
+ * This method's functionality can be expanded by creating new methods
+ * that would match checkAttributeValue[$checkname].
+ *
+ * Current checks implemented are: "maxlen", "minlen", "maxval", "minval" and "valueless"
+ *
+ * @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 $checkvalue The value that is to be checked against
+ * @return bool Indicates whether the check passed or not
+ * @since PHP5 OOP 1.0.0
+ */
+ private function checkAttributeValue($value, $vless, $checkname, $checkvalue)
+ {
+ $ok = true;
+ $check_attribute_method_name = 'checkAttributeValue' . ucfirst(strtolower($checkname));
+ if(method_exists($this, $check_attribute_method_name))
+ {
+ $ok = $this->$check_attribute_method_name($value, $checkvalue, $vless);
+ }
+
+ return $ok;
+ }
+
+ /**
+ * Helper method invoked by checkAttributeValue().
+ *
+ * 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.
+ *
+ * @access private
+ * @param string $value The value of the attribute to be checked.
+ * @param int $checkvalue The maximum value allowed
+ * @return bool Indicates whether the check passed or not
+ * @see checkAttributeValue()
+ * @since PHP5 OOP 1.0.0
+ */
+ private function checkAttributeValueMaxlen($value, $checkvalue)
+ {
+ if (strlen($value) > intval($checkvalue))
+ {
+ return false;
+ }
+ return true;
+ }
+
+ /**
+ * Helper method invoked by checkAttributeValue().
+ *
+ * The minlen check makes sure that the attribute value has a length not
+ * smaller than the given value.
+ *
+ * @access private
+ * @param string $value The value of the attribute to be checked.
+ * @param int $checkvalue The minimum value allowed
+ * @return bool Indicates whether the check passed or not
+ * @see checkAttributeValue()
+ * @since PHP5 OOP 1.0.0
+ */
+ private function checkAttributeValueMinlen($value, $checkvalue)
+ {
+ if (strlen($value) < intval($checkvalue))
+ {
+ return false;
+ }
+ return true;
+ }
+
+ /**
+ * Helper method invoked by checkAttributeValue().
+ *
+ * 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.
+ *
+ * @access private
+ * @param int $value The value of the attribute to be checked.
+ * @param int $checkvalue The maximum numeric value allowed
+ * @return bool Indicates whether the check passed or not
+ * @see checkAttributeValue()
+ * @since PHP5 OOP 1.0.0
+ */
+ private function checkAttributeValueMaxval($value, $checkvalue)
+ {
+ if (!preg_match('/^\s{0,6}[0-9]{1,6}\s{0,6}$/', $value))
+ {
+ return false;
+ }
+ if (intval($value) > intval($checkvalue))
+ {
+ return false;
+ }
+ return true;
+ }
+
+ /**
+ * Helper method invoked by checkAttributeValue().
+ *
+ * The minval check checks that the attribute value is a positive integer,
+ * and that it is not smaller than the given value.
+ *
+ * @access private
+ * @param int $value The value of the attribute to be checked.
+ * @param int $checkvalue The minimum numeric value allowed
+ * @return bool Indicates whether the check passed or not
+ * @see checkAttributeValue()
+ * @since PHP5 OOP 1.0.0
+ */
+ private function checkAttributeValueMinval($value, $checkvalue)
+ {
+ if (!preg_match('/^\s{0,6}[0-9]{1,6}\s{0,6}$/', $value))
+ {
+ return false;
+ }
+ if (intval($value) < ($checkvalue))
+ {
+ return false;
+ }
+ return true;
+ }
+
+ /**
+ * Helper method invoked by checkAttributeValue().
+ *
+ * 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.
+ *
+ * @access private
+ * @param int $value The value of the attribute to be checked.
+ * @param mixed $checkvalue This variable is ignored for this test
+ * @param string $vless Flag indicating if this attribute is not supposed to have an attribute
+ * @return bool Indicates whether the check passed or not
+ * @see checkAttributeValue()
+ * @since PHP5 OOP 1.0.0
+ */
+ private function checkAttributeValueValueless($value, $checkvalue, $vless)
+ {
+ if (strtolower($checkvalue) != $vless)
+ {
+ return false;
+ }
+ return true;
+ }
+
+ /**
+ * 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 $value The entitiy to be decoded.
+ * @return string Decoded entity
+ * @since PHP4 OOP 0.0.1
+ */
+ private function decodeEntities($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 PHP5 OOP version # of kses.
+ *
+ * Since this class has been refactored and documented and proven to work,
+ * I'm fixing the version number at 1.0.0.
+ *
+ * This version is syntax compatible with the PHP4 OOP version 0.0.2. Future
+ * versions may not be syntax compatible.
+ *
+ * @access public
+ * @return string Version number
+ * @since PHP4 OOP 0.0.1
+ */
+ public function Version()
+ {
+ return 'PHP5 OOP 1.0.2';
+ }
+ }
+ }
+?>
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