<?php
    namespace bc_utils;

    class ssh {

        protected $conn;

        // constructor
        public function __construct($host, authentication $auth, $port = 22) {
            $this -> conn = ssh2_connect($host, $port);

            switch(get_class($auth)) {
                case "password":
                    $username = $auth -> get_username();
                    $password = $auth -> get_password();
                    if (ssh2_auth_password($this -> conn, $username, $password) === false) {
                        throw new Exception("SSH2 login is invalid");
                    }
                    break;

                case "key":
                    $username    = $auth -> get_username();
                    $public_key  = $auth -> get_public_key();
                    $private_key = $auth -> get_private_key();

                    if (ssh2_auth_pubkey_file($this -> conn, $username, $public_key, $private_key) === false) {
                        throw new Exception("SSH2 login is invalid");
                    }
                    break;

                default:
                    throw new Exception("Unknown SSH2 login type");
                    break;
            }
        }
    }
?>