mirror of https://github.com/friendica/friendica
73 lines
1.7 KiB
PHP
73 lines
1.7 KiB
PHP
<?php
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/**
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* Validates a rel/rev link attribute against a directive of allowed values
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* @note We cannot use Enum because link types allow multiple
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* values.
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* @note Assumes link types are ASCII text
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*/
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class HTMLPurifier_AttrDef_HTML_LinkTypes extends HTMLPurifier_AttrDef
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{
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/**
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* Name config attribute to pull.
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* @type string
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*/
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protected $name;
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/**
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* @param string $name
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*/
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public function __construct($name)
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{
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$configLookup = array(
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'rel' => 'AllowedRel',
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'rev' => 'AllowedRev'
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);
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if (!isset($configLookup[$name])) {
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trigger_error(
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'Unrecognized attribute name for link ' .
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'relationship.',
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E_USER_ERROR
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);
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return;
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}
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$this->name = $configLookup[$name];
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}
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/**
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* @param string $string
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* @param HTMLPurifier_Config $config
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* @param HTMLPurifier_Context $context
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* @return bool|string
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*/
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public function validate($string, $config, $context)
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{
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$allowed = $config->get('Attr.' . $this->name);
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if (empty($allowed)) {
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return false;
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}
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$string = $this->parseCDATA($string);
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$parts = explode(' ', $string);
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// lookup to prevent duplicates
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$ret_lookup = array();
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foreach ($parts as $part) {
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$part = strtolower(trim($part));
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if (!isset($allowed[$part])) {
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continue;
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}
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$ret_lookup[$part] = true;
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}
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if (empty($ret_lookup)) {
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return false;
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}
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$string = implode(' ', array_keys($ret_lookup));
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return $string;
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}
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}
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// vim: et sw=4 sts=4
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