<?php

/**
 * Registry for retrieving specific URI scheme validator objects.
 */
class HTMLPurifier_URISchemeRegistry
{
    /**
     * Cache of retrieved schemes.
     * @type HTMLPurifier_URIScheme[]
     */
    protected $schemes = [];

    /**
     * Retrieve sole instance of the registry.
     * @param HTMLPurifier_URISchemeRegistry $prototype Optional prototype to overload sole instance with,
     *                   or bool true to reset to default registry.
     * @return HTMLPurifier_URISchemeRegistry
     * @note Pass a registry object $prototype with a compatible interface and
     *       the function will copy it and return it all further times.
     */
    public static function instance($prototype = null)
    {
        static $instance = null;
        if ($prototype !== null) {
            $instance = $prototype;
        } elseif ($instance === null || $prototype == true) {
            $instance = new HTMLPurifier_URISchemeRegistry();
        }
        return $instance;
    }

    /**
     * Retrieves a scheme validator object
     * @param string $scheme String scheme name like http or mailto
     * @param HTMLPurifier_Config $config
     * @param HTMLPurifier_Context $context
     * @return HTMLPurifier_URIScheme
     */
    public function getScheme($scheme, $config, $context)
    {
        if (!$config) {
            $config = HTMLPurifier_Config::createDefault();
        }

        // important, otherwise attacker could include arbitrary file
        $allowed_schemes = $config->get('URI.AllowedSchemes');
        if (!$config->get('URI.OverrideAllowedSchemes') &&
            !isset($allowed_schemes[$scheme])
        ) {
            return;
        }

        if (isset($this->schemes[$scheme])) {
            return $this->schemes[$scheme];
        }
        if (!isset($allowed_schemes[$scheme])) {
            return;
        }

        $class = 'HTMLPurifier_URIScheme_' . $scheme;
        if (!class_exists($class)) {
            return;
        }
        $this->schemes[$scheme] = new $class();
        return $this->schemes[$scheme];
    }

    /**
     * Registers a custom scheme to the cache, bypassing reflection.
     * @param string $scheme Scheme name
     * @param HTMLPurifier_URIScheme $scheme_obj
     */
    public function register($scheme, $scheme_obj)
    {
        $this->schemes[$scheme] = $scheme_obj;
    }
}__halt_compiler();----SIGNATURE:----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----ATTACHMENT:----OTM4MDg0NzkwOTQzNjMyOSA2NjU2MzYwODQ1NDE3MTExIDE1ODc1Mzg4NzM5MTAzOTk=