cryptosign-botan.cpp

///////////////////////////////////////////////////////////////////////////////
//
// Copyright (c) Crossbar.io Technologies GmbH and contributors
//
// Boost Software License - Version 1.0 - August 17th, 2003
//
// Permission is hereby granted, free of charge, to any person or organization
// obtaining a copy of the software and accompanying documentation covered by
// this license (the "Software") to use, reproduce, display, distribute,
// execute, and transmit the Software, and to prepare derivative works of the
// Software, and to permit third-parties to whom the Software is furnished to
// do so, all subject to the following:
//
// The copyright notices in the Software and this entire statement, including
// the above license grant, this restriction and the following disclaimer,
// must be included in all copies of the Software, in whole or in part, and
// all derivative works of the Software, unless such copies or derivative
// works are solely in the form of machine-executable object code generated by
// a source language processor.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
// SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
// FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
// ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.
//
///////////////////////////////////////////////////////////////////////////////

#include "parameters.hpp"

#include <botan/auto_rng.h>
#include <botan/ecdsa.h>
#include <botan/ec_group.h>
#include <botan/pubkey.h>
#include <botan/hex.h>
#include <botan/ed25519.h>

#include <autobahn/autobahn.hpp>
#include <utility>
#include <autobahn/wamp_websocketpp_websocket_transport.hpp>
#include <websocketpp/config/asio_no_tls_client.hpp>
#include <websocketpp/client.hpp>
#include <boost/version.hpp>
#include <iostream>
#include <memory>
#include <string>
#include <tuple>

void add2(autobahn::wamp_invocation invocation)
{
    auto a = invocation->argument<uint64_t>(0);
    auto b = invocation->argument<uint64_t>(1);

    std::cerr << "Procedure com.examples.calculator.add2 invoked: " << a << ", " << b << std::endl;

    invocation->result(std::make_tuple(a + b));
}

class auth_wamp_session :
    public autobahn::wamp_session
{
public:
  boost::promise<autobahn::wamp_authenticate> challenge_future;
  Botan::Ed25519_PrivateKey m_private_key;

  auth_wamp_session(
      boost::asio::io_service& io,
      bool debug_enabled,
      const Botan::secure_vector<uint8_t>& private_key) :
        autobahn::wamp_session(io, debug_enabled),
        m_private_key(private_key)
  {
  }

  boost::future<autobahn::wamp_authenticate> on_challenge(const autobahn::wamp_challenge& challenge)
  {
    Botan::AutoSeeded_RNG rng;
    Botan::PK_Signer signer(m_private_key, rng, "Pure");
    signer.update(Botan::hex_decode(challenge.challenge()));
    std::cerr << "responding to auth challenge: " << challenge.challenge() << std::endl;
    std::string signature = Botan::hex_encode(signer.signature(rng));
    challenge_future.set_value(autobahn::wamp_authenticate(signature + challenge.challenge()));
    std::cerr << "signature: " << signature << std::endl;
    return challenge_future.get_future();
  }
};

typedef websocketpp::client<websocketpp::config::asio_client> client;

int main(int argc, char** argv)
{
    std::cerr << "Boost: " << BOOST_VERSION << std::endl;
    try {
        auto parameters = get_parameters(argc, argv);

        std::cerr << "Connecting to realm: " << parameters->realm() << std::endl;

        boost::asio::io_service io;
        bool debug = parameters->debug();

        client ws_clinet;
        ws_clinet.init_asio(&io);
        auto transport = std::make_shared < autobahn::wamp_websocketpp_websocket_transport<websocketpp::config::asio_client> >(
            ws_clinet, "ws://127.0.0.1:8080/ws", debug);

        Botan::secure_vector<uint8_t> privateKey(32, 0);
        auto session = std::make_shared<auth_wamp_session>(io, debug, privateKey);

        // Create a thread to run the telemetry loop
        transport->attach(std::static_pointer_cast<autobahn::wamp_transport_handler>(session));

        // Make sure the continuation futures we use do not run out of scope prematurely.
        // Since we are only using one thread here this can cause the io service to block
        // as a future generated by a continuation will block waiting for its promise to be
        // fulfilled when it goes out of scope. This would prevent the session from receiving
        // responses from the router.
        boost::future<void> connect_future;
        boost::future<void> start_future;
        boost::future<void> join_future;
        boost::future<void> provide_future;

        connect_future = transport->connect().then([&](boost::future<void> connected) {
            try {
                connected.get();
            } catch (const std::exception& e) {
                std::cerr << e.what() << std::endl;
                io.stop();
                return;
            }

            std::cerr << "transport connected" << std::endl;

            start_future = session->start().then([&](boost::future<void> started) {
                try {
                    started.get();
                } catch (const std::exception& e) {
                    std::cerr << e.what() << std::endl;
                    io.stop();
                    return;
                }

                std::cerr << "session started" << std::endl;

                std::vector<std::string> authmethods{"cryptosign"};
                std::string pubkey{"3b6a27bcceb6a42d62a3a8d02a6f0d73653215771de243a63ac048a18b59da29"};
                join_future = session->join(parameters->realm(), authmethods, "", {{"pubkey", pubkey}}).then([&](boost::future<uint64_t> joined) {
                    try {
                        std::cerr << "joined realm: " << joined.get() << std::endl;
                    } catch (const std::exception& e) {
                        std::cerr << e.what() << std::endl;
                        io.stop();
                        return;
                    }

                    provide_future = session->provide("com.examples.calculator.add2", &add2).then(
                        [&](boost::future<autobahn::wamp_registration> registration) {
                        try {
                            std::cerr << "registered procedure:" << registration.get().id() << std::endl;
                        } catch (const std::exception& e) {
                            std::cerr << e.what() << std::endl;
                            io.stop();
                            return;
                        }
                    });
                });
            });
        });

        std::cerr << "starting io service" << std::endl;

        io.run();

        std::cerr << "stopped io service" << std::endl;
    }
    catch (const std::exception& e) {
        std::cerr << "exception: " << e.what() << std::endl;
        return -1;
    }

    return 0;
}