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#ifndef SIMPLE_WEB_CLIENT_HTTPS_HPP

#define SIMPLE_WEB_CLIENT_HTTPS_HPP

#include "client_http.hpp"

#ifdef ASIO_STANDALONE

#include <asio/ssl.hpp>

#else

#include <boost/asio/ssl.hpp>

#endif

namespace SimpleWeb {

using HTTPS = asio::ssl::stream<asio::ip::tcp::socket>;

template <>

class Client<HTTPS> : public ClientBase<HTTPS> {

public:

/**

* Constructs a client object.

* @param server_port_path Server resource given by host[:port][/path]

* @param verify_certificate Set to true (default) to verify the server's certificate and hostname according to RFC 2818.

* @param certification_file If non-empty, sends the given certification file to server. Requires private_key_file.

* @param private_key_file If non-empty, specifies the file containing the private key for certification_file. Requires certification_file.

* @param verify_file If non-empty, use this certificate authority file to perform verification.

Client(const std::string &server_port_path, bool verify_certificate = true, const std::string &certification_file = std::string(),

const std::string &private_key_file = std::string(), const std::string &verify_file = std::string())

: ClientBase<HTTPS>::ClientBase(server_port_path, 443),

#if (defined(ASIO_STANDALONE) && ASIO_VERSION >= 101300) || BOOST_ASIO_VERSION >= 101300

context(asio::ssl::context::tls_client) {

// Disabling TLS 1.0 and 1.1 (see RFC 8996)

context.set_options(asio::ssl::context::no_tlsv1);

context.set_options(asio::ssl::context::no_tlsv1_1);

#else

context(asio::ssl::context::tlsv12) {

#endif

if(certification_file.size() > 0 && private_key_file.size() > 0) {

context.use_certificate_chain_file(certification_file);

context.use_private_key_file(private_key_file, asio::ssl::context::pem);

}

if(verify_certificate)

#if (defined(ASIO_STANDALONE) && ASIO_VERSION >= 103300) || BOOST_ASIO_VERSION >= 103300

context.set_verify_callback(asio::ssl::host_name_verification(host));

#else

context.set_verify_callback(asio::ssl::rfc2818_verification(host));

#endif

if(verify_file.size() > 0)

context.load_verify_file(verify_file);

else

context.set_default_verify_paths();

if(verify_certificate)

context.set_verify_mode(asio::ssl::verify_peer);

else

context.set_verify_mode(asio::ssl::verify_none);

}

protected:

asio::ssl::context context;

/// Ignore for end of file and SSL_R_SHORT_READ error codes

error_code clean_error_code(const error_code &ec) override {

return ec == error::eof || ec == asio::ssl::error::stream_truncated ? error_code() : ec;

}

std::shared_ptr<Connection> create_connection() noexcept override {

return std::make_shared<Connection>(handler_runner, *io_service, context);

}

void connect(const std::shared_ptr<Session> &session) override {

if(!session->connection->socket->lowest_layer().is_open()) {

auto resolver = std::make_shared<asio::ip::tcp::resolver>(*io_service);

session->connection->set_timeout(this->config.timeout_connect);

async_resolve(*resolver, *host_port, [this, session, resolver](const error_code &ec, resolver_results results) {

session->connection->cancel_timeout();

auto lock = session->connection->handler_runner->continue_lock();

if(!lock)

return;

if(!ec) {

session->connection->set_timeout(this->config.timeout_connect);

asio::async_connect(session->connection->socket->lowest_layer(), results, [this, session, resolver](const error_code &ec, async_connect_endpoint /*endpoint*/) {

session->connection->cancel_timeout();

auto lock = session->connection->handler_runner->continue_lock();

if(!lock)

return;

if(!ec) {

asio::ip::tcp::no_delay option(true);

error_code ec;

session->connection->socket->lowest_layer().set_option(option, ec);

if(!this->config.proxy_server.empty()) {

auto write_buffer = std::make_shared<asio::streambuf>();

std::ostream write_stream(write_buffer.get());

auto host_port = this->host + ':' + std::to_string(this->port);

write_stream << "CONNECT " + host_port + " HTTP/1.1\r\n"

<< "Host: " << host_port << "\r\n\r\n";

session->connection->set_timeout(this->config.timeout_connect);

asio::async_write(session->connection->socket->next_layer(), *write_buffer, [this, session, write_buffer](const error_code &ec, std::size_t /*bytes_transferred*/) {

session->connection->cancel_timeout();

auto lock = session->connection->handler_runner->continue_lock();

if(!lock)

return;

if(!ec) {

std::shared_ptr<Response> response(new Response(this->config.max_response_streambuf_size, session->connection));

session->connection->set_timeout(this->config.timeout_connect);

asio::async_read_until(session->connection->socket->next_layer(), response->streambuf, "\r\n\r\n", [this, session, response](const error_code &ec, std::size_t /*bytes_transferred*/) {

session->connection->cancel_timeout();

auto lock = session->connection->handler_runner->continue_lock();

if(!lock)

return;

if(response->streambuf.size() == response->streambuf.max_size()) {

session->callback(make_error_code::make_error_code(errc::message_size));

return;

}

if(!ec) {

if(!ResponseMessage::parse(response->content, response->http_version, response->status_code, response->header))

session->callback(make_error_code::make_error_code(errc::protocol_error));

else {

if(response->status_code.compare(0, 3, "200") != 0)

session->callback(make_error_code::make_error_code(errc::permission_denied));

else

this->handshake(session);

}

else

session->callback(ec);

});

}

else

session->callback(ec);

});

}

else

this->handshake(session);

}

else

session->callback(ec);

});

}

else

session->callback(ec);

});

}

else

write(session);

}

void handshake(const std::shared_ptr<Session> &session) {

SSL_set_tlsext_host_name(session->connection->socket->native_handle(), this->host.c_str());

session->connection->set_timeout(this->config.timeout_connect);

session->connection->socket->async_handshake(asio::ssl::stream_base::client, [this, session](const error_code &ec) {

session->connection->cancel_timeout();

auto lock = session->connection->handler_runner->continue_lock();

if(!lock)

return;

if(!ec)

this->write(session);

else

session->callback(ec);

});

}

};

} // namespace SimpleWeb

#endif /* SIMPLE_WEB_CLIENT_HTTPS_HPP */

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