<?php
abstract class Responder {
    protected $fragments = array();
    protected $ldap = null;

    public function __construct() {
        global $language, $required_entitlements;

        $this->authorized = false;
        $entitlements = explode(';', $_SERVER['entitlement']);
        foreach($entitlements as $entitlement) {
            if(in_array($entitlement, $required_entitlements)) {
                $this->authorized = true;
            }
        }

        $this->fragments = get_fragments("./html/$language/fragments.html");
        $this->ldap = new Ldap();
    }

    public function respond() {
        if(!$this->authorized) {
            die("Unauthorized.");
        }
        return $this->render();
    }

    abstract public function render();

    final protected function escape_tags($tags) {
        foreach($tags as $key => $tag) {
            $tags[$key] = $this->escape_string(strtolower($tag));
        }
        return $tags;
    }

    final protected function unescape_tags($tags) {
        foreach($tags as $key => $tag) {
            $tags[$key] = $this->unescape_string(strtolower($tag));
        }
        return $tags;
    }

    final protected function escape_string($string) {
        return str_replace(array("'",
                                 '"'),
                           array('&#39;',
                                 '&#34;'),
                           $string);
    }

    final protected function unescape_string($string) {
        return str_replace(array('&#39;',
                                 '&#34;'),
                           array("'",
                                 '"'),
                           $string);
    }
}
?>