mirror of
https://github.com/ezyang/htmlpurifier.git
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114 lines
3.1 KiB
PHP
114 lines
3.1 KiB
PHP
<?php
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/**
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* Validates the HTML attribute ID.
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* @warning Even though this is the id processor, it
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* will ignore the directive Attr:IDBlacklist, since it will only
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* go according to the ID accumulator. Since the accumulator is
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* automatically generated, it will have already absorbed the
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* blacklist. If you're hacking around, make sure you use load()!
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*/
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class HTMLPurifier_AttrDef_HTML_ID extends HTMLPurifier_AttrDef
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{
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// selector is NOT a valid thing to use for IDREFs, because IDREFs
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// *must* target IDs that exist, whereas selector #ids do not.
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/**
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* Determines whether or not we're validating an ID in a CSS
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* selector context.
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* @type bool
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*/
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protected $selector;
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/**
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* @param bool $selector
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*/
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public function __construct($selector = false)
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{
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$this->selector = $selector;
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}
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/**
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* @param string $id
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* @param HTMLPurifier_Config $config
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* @param HTMLPurifier_Context $context
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* @return bool|string
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*/
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public function validate($id, $config, $context)
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{
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if (!$this->selector && !$config->get('Attr.EnableID')) {
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return false;
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}
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$id = trim($id); // trim it first
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if ($id === '') {
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return false;
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}
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$prefix = $config->get('Attr.IDPrefix');
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if ($prefix !== '') {
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$prefix .= $config->get('Attr.IDPrefixLocal');
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// prevent re-appending the prefix
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if (strpos($id, $prefix) !== 0) {
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$id = $prefix . $id;
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}
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} elseif ($config->get('Attr.IDPrefixLocal') !== '') {
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trigger_error(
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'%Attr.IDPrefixLocal cannot be used unless ' .
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'%Attr.IDPrefix is set',
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E_USER_WARNING
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);
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}
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if (!$this->selector) {
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$id_accumulator =& $context->get('IDAccumulator');
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if (isset($id_accumulator->ids[$id])) {
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return false;
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}
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}
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// we purposely avoid using regex, hopefully this is faster
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if ($config->get('Attr.ID.HTML5') === true) {
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if (preg_match('/[\t\n\x0b\x0c ]/', $id)) {
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return false;
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}
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} else {
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if (ctype_alpha($id)) {
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// OK
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} else {
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if (!ctype_alpha(@$id[0])) {
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return false;
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}
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// primitive style of regexps, I suppose
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$trim = trim(
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$id,
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'A..Za..z0..9:-._'
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);
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if ($trim !== '') {
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return false;
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}
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}
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}
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$regexp = $config->get('Attr.IDBlacklistRegexp');
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if ($regexp && preg_match($regexp, $id)) {
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return false;
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}
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if (!$this->selector) {
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$id_accumulator->add($id);
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}
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// if no change was made to the ID, return the result
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// else, return the new id if stripping whitespace made it
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// valid, or return false.
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return $id;
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}
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}
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// vim: et sw=4 sts=4
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