digest_auth.php

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<?php
class DigestAuth implements AuthInterface {

        private $filename;

        private $server;

        private $username;

        private $password;

        private $realm;


        public function __construct($auth, $extra_args){
                foreach(array('filename') as $param){
                        if(isset($extra_args[$param])){
                                $this->$param = $extra_args[$param];
                        } else {
                                throw new KumbiaException("Debe especificar el parámetro '$param' en los parámetros");
                        }
                }
                foreach(array('username', 'password') as $param){
                        if(isset($extra_args[$param])){
                                $this->$param = $extra_args[$param];
                        }
                }
        }

        public function get_identity(){
                $identity = array("username" => $this->username, "realm" => $this->realm);
                return $identity;
        }

        public function authenticate(){
                $this->resource = @fopen($this->filename, "r");
                if($this->resource===false){
                        throw new KumbiaException("No existe o no se puede cargar el archivo '{$this->filename}'");
                }

                $exists_user = false;
                while(!feof($this->resource)){
                        $line = fgets($this->resource);
                        $data = explode(":", $line);

                        if($data[0]==$this->username){
                                if(trim($data[2])==md5($this->password)){
                                        $this->realm = $data[1];
                                        $exists_user = true;
                                        break;
                                }
                        }
                }
                return $exists_user;
        }


        public function set_params($extra_args){
                foreach(array('filename', 'username', 'password') as $param){
                        if(isset($extra_args[$param])){
                                $this->$param = $extra_args[$param];
                        }
                }
        }


        public function __destruct(){
                @fclose($this->resource);
        }

}