112 lines
2.6 KiB
PHP
112 lines
2.6 KiB
PHP
<?php
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/**
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* Validates a URI as defined by RFC 3986.
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* @note Scheme-specific mechanics deferred to HTMLPurifier_URIScheme
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*/
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class HTMLPurifier_AttrDef_URI extends HTMLPurifier_AttrDef
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{
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/**
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* @type HTMLPurifier_URIParser
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*/
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protected $parser;
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/**
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* @type bool
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*/
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protected $embedsResource;
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/**
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* @param bool $embeds_resource Does the URI here result in an extra HTTP request?
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*/
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public function __construct($embeds_resource = false)
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{
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$this->parser = new HTMLPurifier_URIParser();
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$this->embedsResource = (bool)$embeds_resource;
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}
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/**
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* @param string $string
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* @return HTMLPurifier_AttrDef_URI
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*/
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public function make($string)
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{
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$embeds = ($string === 'embedded');
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return new HTMLPurifier_AttrDef_URI($embeds);
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}
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/**
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* @param string $uri
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* @param HTMLPurifier_Config $config
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* @param HTMLPurifier_Context $context
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* @return bool|string
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*/
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public function validate($uri, $config, $context)
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{
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if ($config->get('URI.Disable')) {
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return false;
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}
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$uri = $this->parseCDATA($uri);
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// parse the URI
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$uri = $this->parser->parse($uri);
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if ($uri === false) {
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return false;
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}
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// add embedded flag to context for validators
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$context->register('EmbeddedURI', $this->embedsResource);
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$ok = false;
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do {
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// generic validation
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$result = $uri->validate($config, $context);
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if (!$result) {
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break;
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}
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// chained filtering
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$uri_def = $config->getDefinition('URI');
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$result = $uri_def->filter($uri, $config, $context);
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if (!$result) {
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break;
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}
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// scheme-specific validation
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$scheme_obj = $uri->getSchemeObj($config, $context);
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if (!$scheme_obj) {
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break;
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}
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if ($this->embedsResource && !$scheme_obj->browsable) {
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break;
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}
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$result = $scheme_obj->validate($uri, $config, $context);
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if (!$result) {
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break;
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}
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// Post chained filtering
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$result = $uri_def->postFilter($uri, $config, $context);
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if (!$result) {
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break;
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}
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// survived gauntlet
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$ok = true;
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} while (false);
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$context->destroy('EmbeddedURI');
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if (!$ok) {
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return false;
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}
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// back to string
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return $uri->toString();
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}
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}
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// vim: et sw=4 sts=4
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