digest_auth.php

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<?php
class DigestAuth implements AuthInterface
{

    private $filename;
    private $server;
    private $username;
    private $password;
    private $realm;
    private $resource;

    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 par�metro '$param' en los par�metros");
            }
        }
        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);
    }

}