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82 lines
2.4 KiB
82 lines
2.4 KiB
4 years ago
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<?php
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/**
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* Registry for retrieving specific URI scheme validator objects.
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*/
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class HTMLPurifier_URISchemeRegistry
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{
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/**
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* Retrieve sole instance of the registry.
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* @param HTMLPurifier_URISchemeRegistry $prototype Optional prototype to overload sole instance with,
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* or bool true to reset to default registry.
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* @return HTMLPurifier_URISchemeRegistry
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* @note Pass a registry object $prototype with a compatible interface and
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* the function will copy it and return it all further times.
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*/
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public static function instance($prototype = null)
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{
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static $instance = null;
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if ($prototype !== null) {
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$instance = $prototype;
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} elseif ($instance === null || $prototype == true) {
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$instance = new HTMLPurifier_URISchemeRegistry();
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}
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return $instance;
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}
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/**
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* Cache of retrieved schemes.
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* @type HTMLPurifier_URIScheme[]
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*/
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protected $schemes = array();
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/**
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* Retrieves a scheme validator object
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* @param string $scheme String scheme name like http or mailto
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* @param HTMLPurifier_Config $config
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* @param HTMLPurifier_Context $context
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* @return HTMLPurifier_URIScheme
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*/
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public function getScheme($scheme, $config, $context)
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{
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if (!$config) {
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$config = HTMLPurifier_Config::createDefault();
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}
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// important, otherwise attacker could include arbitrary file
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$allowed_schemes = $config->get('URI.AllowedSchemes');
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if (!$config->get('URI.OverrideAllowedSchemes') &&
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!isset($allowed_schemes[$scheme])
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) {
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return;
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}
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if (isset($this->schemes[$scheme])) {
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return $this->schemes[$scheme];
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}
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if (!isset($allowed_schemes[$scheme])) {
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return;
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}
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$class = 'HTMLPurifier_URIScheme_' . $scheme;
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if (!class_exists($class)) {
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return;
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}
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$this->schemes[$scheme] = new $class();
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return $this->schemes[$scheme];
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}
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/**
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* Registers a custom scheme to the cache, bypassing reflection.
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* @param string $scheme Scheme name
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* @param HTMLPurifier_URIScheme $scheme_obj
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*/
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public function register($scheme, $scheme_obj)
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{
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$this->schemes[$scheme] = $scheme_obj;
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}
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}
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// vim: et sw=4 sts=4
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