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phpdoc for kses from darkdragon. fixes #5641 

git-svn-id: http://svn.automattic.com/wordpress/trunk@6630 1a063a9b-81f0-0310-95a4-ce76da25c4cd
This commit is contained in:
ryan 2008-01-16 19:15:07 +00:00
parent f8ab885ab0
commit 0aee557b68
1 changed files with 393 additions and 163 deletions
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552
wp-includes/kses.php
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@ -1,23 +1,46 @@
<?php
/**
* HTML/XHTML filter that only allows some elements and attributes
*
* Added wp_ prefix to avoid conflicts with existing kses users
*
* @version 0.2.2
* @copyright (C) 2002, 2003, 2005
* @author Ulf Harnhammar <metaur@users.sourceforge.net>
*
* @package External
* @subpackage KSES
*
* @internal
* *** 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!]
*/
// Added wp_ prefix to avoid conflicts with existing kses users
# kses 0.2.2 - HTML/XHTML filter that only allows some elements and attributes
# Copyright (C) 2002, 2003, 2005 Ulf Harnhammar
# *** 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!]
/**
* You can override this in your my-hacks.php file
* You can also override this in a plugin file. The
* my-hacks.php is deprecated in its usage.
*
* @since 1.2.0
*/
if (!defined('CUSTOM_TAGS'))
define('CUSTOM_TAGS', false);
// You can override this in your my-hacks.php file
if (!CUSTOM_TAGS) {
/**
* Kses global for default allowable HTML tags
*
* Can be override by using CUSTOM_TAGS constant
* @global array $allowedposttags
* @since 2.0.0
*/
$allowedposttags = array(
'address' => array(),
'a' => array(
@ -251,6 +274,12 @@ if (!CUSTOM_TAGS) {
'ol' => array (
'class' => array ()),
'var' => array ());
/**
* Kses allowed HTML elements
*
* @global array $allowedtags
* @since 1.0.0
*/
$allowedtags = array(
'a' => array(
'href' => array (),
@ -286,57 +315,103 @@ if (!CUSTOM_TAGS) {
);
}
function wp_kses($string, $allowed_html, $allowed_protocols = array ('http', 'https', 'ftp', 'ftps', 'mailto', 'news', 'irc', 'gopher', 'nntp', 'feed', 'telnet'))
###############################################################################
# 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.
###############################################################################
{
/**
* wp_kses() - Filters content and keeps only allowable HTML elements.
*
* 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.
*
* The default allowed protocols are 'http', 'https', 'ftp', 'mailto',
* 'news', 'irc', 'gopher', 'nntp', 'feed', and finally 'telnet. This
* covers all common link protocols, except for 'javascript' which
* should not be allowed for untrusted users.
*
* @since 1.0.0
*
* @param string $string Content to filter through kses
* @param array $allowed_html List of allowed HTML elements
* @param array $allowed_protocols Optional. Allowed protocol in links.
* @return string Filtered content with only allowed HTML elements
*/
function wp_kses($string, $allowed_html, $allowed_protocols = array ('http', 'https', 'ftp', 'ftps', 'mailto', 'news', 'irc', 'gopher', 'nntp', 'feed', 'telnet')) {
$string = wp_kses_no_null($string);
$string = wp_kses_js_entities($string);
$string = wp_kses_normalize_entities($string);
$allowed_html_fixed = wp_kses_array_lc($allowed_html);
$string = wp_kses_hook($string, $allowed_html_fixed, $allowed_protocols); // WP changed the order of these funcs and added args to wp_kses_hook
return wp_kses_split($string, $allowed_html_fixed, $allowed_protocols);
} # function wp_kses
}
function wp_kses_hook($string, $allowed_html, $allowed_protocols)
###############################################################################
# You add any kses hooks here.
###############################################################################
{
/**
* wp_kses_hook() - You add any kses hooks here.
*
* There is currently only one kses WordPress hook and it is
* called here. All parameters are passed to the hooks and
* expected to recieve a string.
*
* @since 1.0.0
*
* @param string $string Content to filter through kses
* @param array $allowed_html List of allowed HTML elements
* @param array $allowed_protocols Allowed protocol in links
* @return string Filtered content through 'pre_kses' hook
*/
function wp_kses_hook($string, $allowed_html, $allowed_protocols) {
$string = apply_filters('pre_kses', $string, $allowed_html, $allowed_protocols);
return $string;
} # function wp_kses_hook
}
function wp_kses_version()
###############################################################################
# This function returns kses' version number.
###############################################################################
{
/**
* wp_kses_version() - This function returns kses' version number.
*
* @since 1.0.0
*
* @return string Version Number
*/
function wp_kses_version() {
return '0.2.2';
} # function wp_kses_version
}
function wp_kses_split($string, $allowed_html, $allowed_protocols)
###############################################################################
# This function searches for HTML tags, no matter how malformed. It also
# matches stray ">" characters.
###############################################################################
{
/**
* wp_kses_split() - Searches for HTML tags, no matter how malformed
*
* It also matches stray ">" characters.
*
* @since 1.0.0
*
* @param string $string Content to filter
* @param array $allowed_html Allowed HTML elements
* @param array $allowed_protocols Allowed protocols to keep
* @return string Content with fixed HTML tags
*/
function wp_kses_split($string, $allowed_html, $allowed_protocols) {
return preg_replace('%((<!--.*?(-->|$))|(<[^>]*(>|$)|>))%e',
"wp_kses_split2('\\1', \$allowed_html, ".'$allowed_protocols)', $string);
} # function wp_kses_split
}
function wp_kses_split2($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.
###############################################################################
{
/**
* wp_kses_split2() - Callback for wp_kses_split for fixing malformed HTML tags
*
* 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.
*
* After the tag is split into an element and an attribute list, it is run
* through another filter which will remove illegal attributes and once
* that is completed, will be returned.
*
* @since 1.0.0
* @uses wp_kses_attr()
*
* @param string $string Content to filter
* @param array $allowed_html Allowed HTML elements
* @param array $allowed_protocols Allowed protocols to keep
* @return string Fixed HTML element
*/
function wp_kses_split2($string, $allowed_html, $allowed_protocols) {
$string = wp_kses_stripslashes($string);
if (substr($string, 0, 1) != '<')
@ -370,18 +445,26 @@ function wp_kses_split2($string, $allowed_html, $allowed_protocols)
# No attributes are allowed for closing elements
return wp_kses_attr("$slash$elem", $attrlist, $allowed_html, $allowed_protocols);
} # function wp_kses_split2
}
function wp_kses_attr($element, $attr, $allowed_html, $allowed_protocols)
###############################################################################
# This function removes all attributes, if none are allowed for this element.
# If some are allowed it calls wp_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.
###############################################################################
{
/**
* wp_kses_attr() - Removes all attributes, if none are allowed for this element
*
* If some are allowed it calls wp_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.
*
* @since 1.0.0
*
* @param string $element HTML element/tag
* @param string $attr HTML attributes from HTML element to closing HTML element tag
* @param array $allowed_html Allowed HTML elements
* @param array $allowed_protocols Allowed protocols to keep
* @return string Sanitized HTML element
*/
function wp_kses_attr($element, $attr, $allowed_html, $allowed_protocols) {
# Is there a closing XHTML slash at the end of the attributes?
$xhtml_slash = '';
@ -433,18 +516,25 @@ function wp_kses_attr($element, $attr, $allowed_html, $allowed_protocols)
$attr2 = preg_replace('/[<>]/', '', $attr2);
return "<$element$attr2$xhtml_slash>";
} # function wp_kses_attr
}
function wp_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.
###############################################################################
{
/**
* wp_kses_hair() - Builds an attribute list from string containing attributes.
*
* 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.
*
* @since 1.0.0
*
* @param string $attr Attribute list from HTML element to closing HTML element tag
* @param array $allowed_protocols Allowed protocols to keep
* @return array List of attributes after parsing
*/
function wp_kses_hair($attr, $allowed_protocols) {
$attrarr = array ();
$mode = 0;
$attrname = '';
@ -539,15 +629,23 @@ function wp_kses_hair($attr, $allowed_protocols)
$attrarr[] = array ('name' => $attrname, 'value' => '', 'whole' => $attrname, 'vless' => 'y');
return $attrarr;
} # function wp_kses_hair
}
function wp_kses_check_attr_val($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.
###############################################################################
{
/**
* wp_kses_check_attr_val() - Performs different checks for attribute values.
*
* The currently implemented checks are "maxlen", "minlen", "maxval", "minval"
* and "valueless" with even more checks to come soon.
*
* @since 1.0.0
*
* @param string $value Attribute value
* @param string $vless Whether the value is valueless or not. Use 'y' or 'n'
* @param string $checkname What $checkvalue is checking for.
* @param mixed $checkvalue What constraint the value should pass
* @return bool Whether check passes (true) or not (false)
*/
function wp_kses_check_attr_val($value, $vless, $checkname, $checkvalue) {
$ok = true;
switch (strtolower($checkname)) {
@ -603,16 +701,23 @@ function wp_kses_check_attr_val($value, $vless, $checkname, $checkvalue)
} # switch
return $ok;
} # function wp_kses_check_attr_val
}
function wp_kses_bad_protocol($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)".
###############################################################################
{
/**
* wp_kses_bad_protocol() - Sanitize string from bad 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)".
*
* @since 1.0.0
*
* @param string $string Content to filter bad protocols from
* @param array $allowed_protocols Allowed protocols to keep
* @return string Filtered content
*/
function wp_kses_bad_protocol($string, $allowed_protocols) {
$string = wp_kses_no_null($string);
$string = preg_replace('/\xad+/', '', $string); # deals with Opera "feature"
$string2 = $string.'a';
@ -623,34 +728,48 @@ function wp_kses_bad_protocol($string, $allowed_protocols)
} # while
return $string;
} # function wp_kses_bad_protocol
}
function wp_kses_no_null($string)
###############################################################################
# This function removes any NULL characters in $string.
###############################################################################
{
/**
* wp_kses_no_null() - Removes any NULL characters in $string.
*
* @since 1.0.0
*
* @param string $string
* @return string
*/
function wp_kses_no_null($string) {
$string = preg_replace('/\0+/', '', $string);
$string = preg_replace('/(\\\\0)+/', '', $string);
return $string;
} # function wp_kses_no_null
}
function wp_kses_stripslashes($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.
###############################################################################
{
/**
* wp_kses_stripslashes() - Strips slashes from in front of quotes
*
* 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.
*
* @since 1.0.0
*
* @param string $string String to strip slashes
* @return string Fixed strings with quoted slashes
*/
function wp_kses_stripslashes($string) {
return preg_replace('%\\\\"%', '"', $string);
} # function wp_kses_stripslashes
}
function wp_kses_array_lc($inarray)
###############################################################################
# This function goes through an array, and changes the keys to all lower case.
###############################################################################
{
/**
* wp_kses_array_lc() - Goes through an array and changes the keys to all lower case.
*
* @since 1.0.0
*
* @param array $inarray Unfiltered array
* @return array Fixed array with all lowercase keys
*/
function wp_kses_array_lc($inarray) {
$outarray = array ();
foreach ($inarray as $inkey => $inval) {
@ -664,42 +783,64 @@ function wp_kses_array_lc($inarray)
} # foreach $inarray
return $outarray;
} # function wp_kses_array_lc
}
function wp_kses_js_entities($string)
###############################################################################
# This function removes the HTML JavaScript entities found in early versions of
# Netscape 4.
###############################################################################
{
/**
* wp_kses_js_entities() - Removes the HTML JavaScript entities found in early versions of Netscape 4.
*
* @since 1.0.0
*
* @param string $string
* @return string
*/
function wp_kses_js_entities($string) {
return preg_replace('%&\s*\{[^}]*(\}\s*;?|$)%', '', $string);
} # function wp_kses_js_entities
}
function wp_kses_html_error($string)
###############################################################################
# This function deals with parsing errors in wp_kses_hair(). The general plan is
# to remove everything to and including some whitespace, but it deals with
# quotes and apostrophes as well.
###############################################################################
{
/**
* wp_kses_html_error() - Handles parsing errors in wp_kses_hair()
*
* The general plan is to remove everything to and including some
* whitespace, but it deals with quotes and apostrophes as well.
*
* @since 1.0.0
*
* @param string $string
* @return string
*/
function wp_kses_html_error($string) {
return preg_replace('/^("[^"]*("|$)|\'[^\']*(\'|$)|\S)*\s*/', '', $string);
} # function wp_kses_html_error
}
function wp_kses_bad_protocol_once($string, $allowed_protocols)
###############################################################################
# This function searches for URL protocols at the beginning of $string, while
# handling whitespace and HTML entities.
###############################################################################
{
/**
* wp_kses_bad_protocol_once() - Sanitizes content from bad protocols and other characters
*
* This function searches for URL protocols at the beginning of $string,
* while handling whitespace and HTML entities.
*
* @since 1.0.0
*
* @param string $string Content to check for bad protocols
* @param string $allowed_protocols Allowed protocols
* @return string Sanitized content
*/
function wp_kses_bad_protocol_once($string, $allowed_protocols) {
return preg_replace('/^((&[^;]*;|[\sA-Za-z0-9])*)'.'(:|&#58;|&#[Xx]3[Aa];)\s*/e', 'wp_kses_bad_protocol_once2("\\1", $allowed_protocols)', $string);
} # function wp_kses_bad_protocol_once
}
function wp_kses_bad_protocol_once2($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.
###############################################################################
{
/**
* wp_kses_bad_protocol_once2() - Callback for wp_kses_bad_protocol_once() regular expression.
*
* 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.
*
* @since 1.0.0
*
* @param string $string Content to check for bad protocols
* @param array $allowed_protocols Allowed protocols
* @return string Sanitized content
*/
function wp_kses_bad_protocol_once2($string, $allowed_protocols) {
$string2 = wp_kses_decode_entities($string);
$string2 = preg_replace('/\s/', '', $string2);
$string2 = wp_kses_no_null($string2);
@ -718,14 +859,21 @@ function wp_kses_bad_protocol_once2($string, $allowed_protocols)
return "$string2:";
else
return '';
} # function wp_kses_bad_protocol_once2
}
function wp_kses_normalize_entities($string)
###############################################################################
# This function normalizes HTML entities. It will convert "AT&T" to the correct
# "AT&amp;T", "&#00058;" to "&#58;", "&#XYZZY;" to "&amp;#XYZZY;" and so on.
###############################################################################
{
/**
* wp_kses_normalize_entities() - Converts and fixes HTML entities
*
* This function normalizes HTML entities. It will convert "AT&T" to the
* correct "AT&amp;T", "&#00058;" to "&#58;", "&#XYZZY;" to "&amp;#XYZZY;"
* and so on.
*
* @since 1.0.0
*
* @param string $string Content to normalize entities
* @return string Content with normalized entities
*/
function wp_kses_normalize_entities($string) {
# Disarm all entities by converting & to &amp;
$string = str_replace('&', '&amp;', $string);
@ -737,44 +885,97 @@ function wp_kses_normalize_entities($string)
$string = preg_replace('/&amp;#([Xx])0*(([0-9A-Fa-f]{2}){1,2});/', '&#\\1\\2;', $string);
return $string;
} # function wp_kses_normalize_entities
}
function wp_kses_normalize_entities2($i)
###############################################################################
# This function helps wp_kses_normalize_entities() to only accept 16 bit values
# and nothing more for &#number; entities.
###############################################################################
{
/**
* wp_kses_normalize_entities2() - Callback for wp_kses_normalize_entities() regular expression
*
* This function helps wp_kses_normalize_entities() to only accept 16 bit
* values and nothing more for &#number; entities.
*
* @since 1.0.0
*
* @param int $i Number encoded entity
* @return string Correctly encoded entity
*/
function wp_kses_normalize_entities2($i) {
return (($i > 65535) ? "&amp;#$i;" : "&#$i;");
} # function wp_kses_normalize_entities2
}
function wp_kses_decode_entities($string)
###############################################################################
# This function decodes numeric HTML entities (&#65; and &#x41;). It doesn't
# do anything with other entities like &auml;, but we don't need them in the
# URL protocol whitelisting system anyway.
###############################################################################
{
/**
* wp_kses_decode_entities() - Convert all entities to their character counterparts.
*
* This function decodes numeric HTML entities (&#65; and &#x41;). It
* doesn't do anything with other entities like &auml;, but we don't need
* them in the URL protocol whitelisting system anyway.
*
* @since 1.0.0
*
* @param string $string Content to change entities
* @return string Content after decoded entities
*/
function wp_kses_decode_entities($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;
} # function wp_kses_decode_entities
}
/**
* wp_filter_kses() - Sanitize content with allowed HTML Kses rules
*
* @since 1.0.0
* @uses $allowedtags
*
* @param string $data Content to filter
* @return string Filtered content
*/
function wp_filter_kses($data) {
global $allowedtags;
return addslashes( wp_kses(stripslashes( $data ), $allowedtags) );
}
/**
* wp_filter_post_kses() - Sanitize content for allowed HTML tags for post content
*
* Post content refers to the page contents of the 'post' type and not
* $_POST data from forms.
*
* @since 2.0.0
* @uses $allowedposttags
*
* @param string $data Post content to filter
* @return string Filtered post content with allowed HTML tags and attributes intact.
*/
function wp_filter_post_kses($data) {
global $allowedposttags;
return addslashes ( wp_kses(stripslashes( $data ), $allowedposttags) );
}
/**
* wp_filter_nohtml_kses() - Strips all of the HTML in the content
*
* @since 2.1.0
*
* @param string $data Content to strip all HTML from
* @return string Filtered content without any HTML
*/
function wp_filter_nohtml_kses($data) {
return addslashes ( wp_kses(stripslashes( $data ), array()) );
}
/**
* kses_init_filters() - Adds all Kses input form content filters
*
* All hooks have default priority. The wp_filter_kses() fucntion
* is added to the 'pre_comment_content' and 'title_save_pre'
* hooks. The wp_filter_post_kses() function is added to the
* 'content_save_pre', 'excerpt_save_pre', and 'content_filtered_save_pre'
* hooks.
*
* @since 2.0.0
* @uses add_filter() See description for what functions are added to what hooks.
*/
function kses_init_filters() {
// Normal filtering.
add_filter('pre_comment_content', 'wp_filter_kses');
@ -786,6 +987,19 @@ function kses_init_filters() {
add_filter('content_filtered_save_pre', 'wp_filter_post_kses');
}
/**
* kses_remove_filters() - Removes all Kses input form content filters
*
* A quick procedural method to removing all of the filters
* that kses uses for content in WordPress Loop.
*
* Does not remove the kses_init() function from 'init' hook
* (priority is default). Also does not remove kses_init()
* function from 'set_current_user' hook (priority is also
* default).
*
* @since 2.0.6
*/
function kses_remove_filters() {
// Normal filtering.
remove_filter('pre_comment_content', 'wp_filter_kses');
@ -797,6 +1011,22 @@ function kses_remove_filters() {
remove_filter('content_filtered_save_pre', 'wp_filter_post_kses');
}
/**
* kses_init() - Sets up most of the Kses filters for input form content
*
* If you remove the kses_init() function from 'init' hook and
* 'set_current_user' (priority is default), then none of the
* Kses filter hooks will be added.
*
* First removes all of the Kses filters in case the current user
* does not need to have Kses filter the content. If the user does
* not have unfiltered html capability, then Kses filters are added.
*
* @uses kses_remove_filters() Removes the Kses filters
* @uses kses_init_filters() Adds the Kses filters back if the user
* does not have unfiltered HTML capability.
* @since 2.0.0
*/
function kses_init() {
kses_remove_filters();