SSLHTTPPeer.h

#pragma once
 
#include <xrpl/server/detail/BaseHTTPPeer.h>
#include <xrpl/server/detail/SSLWSPeer.h>
 
#include <boost/asio/ip/tcp.hpp>
#include <boost/asio/ssl/context.hpp>
#include <boost/asio/ssl/stream.hpp>
#include <boost/beast/core/tcp_stream.hpp>
#include <boost/beast/ssl/ssl_stream.hpp>
 
#include <memory>
 
namespace xrpl {
 
template <class Handler>
class SSLHTTPPeer : public BaseHTTPPeer<Handler, SSLHTTPPeer<Handler>>,
                    public std::enable_shared_from_this<SSLHTTPPeer<Handler>>
{
private:
    friend class BaseHTTPPeer<Handler, SSLHTTPPeer>;
    using socket_type = boost::asio::ip::tcp::socket;
    using middle_type = boost::beast::tcp_stream;
    using stream_type = boost::beast::ssl_stream<middle_type>;
    using endpoint_type = boost::asio::ip::tcp::endpoint;
    using yield_context = boost::asio::yield_context;
    using error_code = boost::system::error_code;
 
    std::unique_ptr<stream_type> stream_ptr_;
    stream_type& stream_;
    socket_type& socket_;
 
public:
    template <class ConstBufferSequence>
    SSLHTTPPeer(
        Port const& port,
        Handler& handler,
        boost::asio::io_context& ioc,
        beast::Journal journal,
        endpoint_type remote_address,
        ConstBufferSequence const& buffers,
        middle_type&& stream);
 
    void
    run();
 
    std::shared_ptr<WSSession>
    websocketUpgrade() override;
 
private:
    void
    do_handshake(yield_context do_yield);
 
    void
    do_request() override;
 
    void
    do_close() override;
 
    void
    on_shutdown(error_code ec);
};
 
//------------------------------------------------------------------------------
 
template <class Handler>
template <class ConstBufferSequence>
SSLHTTPPeer<Handler>::SSLHTTPPeer(
    Port const& port,
    Handler& handler,
    boost::asio::io_context& ioc,
    beast::Journal journal,
    endpoint_type remote_address,
    ConstBufferSequence const& buffers,
    middle_type&& stream)
    : BaseHTTPPeer<Handler, SSLHTTPPeer>(
          port,
          handler,
          ioc.get_executor(),
          journal,
          remote_address,
          buffers)
    , stream_ptr_(std::make_unique<stream_type>(middle_type(std::move(stream)), *port.context))
    , stream_(*stream_ptr_)
    , socket_(stream_.next_layer().socket())
{
}
 
// Called when the acceptor accepts our socket.
template <class Handler>
void
SSLHTTPPeer<Handler>::run()
{
    if (!this->handler_.onAccept(this->session(), this->remote_address_))
    {
        util::spawn(this->strand_, std::bind(&SSLHTTPPeer::do_close, this->shared_from_this()));
        return;
    }
    if (!socket_.is_open())
        return;
    util::spawn(
        this->strand_,
        std::bind(&SSLHTTPPeer::do_handshake, this->shared_from_this(), std::placeholders::_1));
}
 
template <class Handler>
std::shared_ptr<WSSession>
SSLHTTPPeer<Handler>::websocketUpgrade()
{
    auto ws = this->ios().template emplace<SSLWSPeer<Handler>>(
        this->port_,
        this->handler_,
        this->remote_address_,
        std::move(this->message_),
        std::move(this->stream_ptr_),
        this->journal_);
    return ws;
}
 
template <class Handler>
void
SSLHTTPPeer<Handler>::do_handshake(yield_context do_yield)
{
    boost::system::error_code ec;
    stream_.set_verify_mode(boost::asio::ssl::verify_none);
    this->start_timer();
    this->read_buf_.consume(
        stream_.async_handshake(stream_type::server, this->read_buf_.data(), do_yield[ec]));
    this->cancel_timer();
    if (ec == boost::beast::error::timeout)
        return this->on_timer();
    if (ec)
        return this->fail(ec, "handshake");
    bool const http = this->port().protocol.count("peer") > 0 ||
        this->port().protocol.count("wss") > 0 || this->port().protocol.count("wss2") > 0 ||
        this->port().protocol.count("https") > 0;
    if (http)
    {
        util::spawn(
            this->strand_,
            std::bind(&SSLHTTPPeer::do_read, this->shared_from_this(), std::placeholders::_1));
        return;
    }
    // `this` will be destroyed
}
 
template <class Handler>
void
SSLHTTPPeer<Handler>::do_request()
{
    ++this->request_count_;
    auto const what = this->handler_.onHandoff(
        this->session(), std::move(stream_ptr_), std::move(this->message_), this->remote_address_);
    if (what.moved)
        return;
    if (what.response)
        return this->write(what.response, what.keep_alive);
    // legacy
    this->handler_.onRequest(this->session());
}
 
template <class Handler>
void
SSLHTTPPeer<Handler>::do_close()
{
    this->start_timer();
    stream_.async_shutdown(bind_executor(
        this->strand_,
        std::bind(&SSLHTTPPeer::on_shutdown, this->shared_from_this(), std::placeholders::_1)));
}
 
template <class Handler>
void
SSLHTTPPeer<Handler>::on_shutdown(error_code ec)
{
    this->cancel_timer();
 
    if (ec == boost::asio::error::operation_aborted)
        return;
    if (ec)
    {
        JLOG(this->journal_.debug()) << "on_shutdown: " << ec.message();
    }
 
    // Close socket now in case this->destructor is delayed
    stream_.next_layer().close();
}
 
}  // namespace xrpl