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- //
- // Copyright (c) 2016-2019 Vinnie Falco (vinnie dot falco at gmail dot com)
- //
- // Distributed under the Boost Software License, Version 1.0. (See accompanying
- // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
- //
- // Official repository: https://github.com/boostorg/beast
- //
- //------------------------------------------------------------------------------
- //
- // Example: HTTP SSL server, synchronous
- //
- //------------------------------------------------------------------------------
- #include "example/common/server_certificate.hpp"
- #include <boost/beast/core.hpp>
- #include <boost/beast/http.hpp>
- #include <boost/beast/ssl.hpp>
- #include <boost/beast/version.hpp>
- #include <boost/asio/ip/tcp.hpp>
- #include <boost/asio/ssl/stream.hpp>
- #include <boost/config.hpp>
- #include <cstdlib>
- #include <iostream>
- #include <memory>
- #include <string>
- #include <thread>
- namespace beast = boost::beast; // from <boost/beast.hpp>
- namespace http = beast::http; // from <boost/beast/http.hpp>
- namespace net = boost::asio; // from <boost/asio.hpp>
- namespace ssl = boost::asio::ssl; // from <boost/asio/ssl.hpp>
- using tcp = boost::asio::ip::tcp; // from <boost/asio/ip/tcp.hpp>
- // Return a reasonable mime type based on the extension of a file.
- beast::string_view
- mime_type(beast::string_view path)
- {
- using beast::iequals;
- auto const ext = [&path]
- {
- auto const pos = path.rfind(".");
- if(pos == beast::string_view::npos)
- return beast::string_view{};
- return path.substr(pos);
- }();
- if(iequals(ext, ".htm")) return "text/html";
- if(iequals(ext, ".html")) return "text/html";
- if(iequals(ext, ".php")) return "text/html";
- if(iequals(ext, ".css")) return "text/css";
- if(iequals(ext, ".txt")) return "text/plain";
- if(iequals(ext, ".js")) return "application/javascript";
- if(iequals(ext, ".json")) return "application/json";
- if(iequals(ext, ".xml")) return "application/xml";
- if(iequals(ext, ".swf")) return "application/x-shockwave-flash";
- if(iequals(ext, ".flv")) return "video/x-flv";
- if(iequals(ext, ".png")) return "image/png";
- if(iequals(ext, ".jpe")) return "image/jpeg";
- if(iequals(ext, ".jpeg")) return "image/jpeg";
- if(iequals(ext, ".jpg")) return "image/jpeg";
- if(iequals(ext, ".gif")) return "image/gif";
- if(iequals(ext, ".bmp")) return "image/bmp";
- if(iequals(ext, ".ico")) return "image/vnd.microsoft.icon";
- if(iequals(ext, ".tiff")) return "image/tiff";
- if(iequals(ext, ".tif")) return "image/tiff";
- if(iequals(ext, ".svg")) return "image/svg+xml";
- if(iequals(ext, ".svgz")) return "image/svg+xml";
- return "application/text";
- }
- // Append an HTTP rel-path to a local filesystem path.
- // The returned path is normalized for the platform.
- std::string
- path_cat(
- beast::string_view base,
- beast::string_view path)
- {
- if(base.empty())
- return std::string(path);
- std::string result(base);
- #ifdef BOOST_MSVC
- char constexpr path_separator = '\\';
- if(result.back() == path_separator)
- result.resize(result.size() - 1);
- result.append(path.data(), path.size());
- for(auto& c : result)
- if(c == '/')
- c = path_separator;
- #else
- char constexpr path_separator = '/';
- if(result.back() == path_separator)
- result.resize(result.size() - 1);
- result.append(path.data(), path.size());
- #endif
- return result;
- }
- // This function produces an HTTP response for the given
- // request. The type of the response object depends on the
- // contents of the request, so the interface requires the
- // caller to pass a generic lambda for receiving the response.
- template<
- class Body, class Allocator,
- class Send>
- void
- handle_request(
- beast::string_view doc_root,
- http::request<Body, http::basic_fields<Allocator>>&& req,
- Send&& send)
- {
- // Returns a bad request response
- auto const bad_request =
- [&req](beast::string_view why)
- {
- http::response<http::string_body> res{http::status::bad_request, req.version()};
- res.set(http::field::server, BOOST_BEAST_VERSION_STRING);
- res.set(http::field::content_type, "text/html");
- res.keep_alive(req.keep_alive());
- res.body() = std::string(why);
- res.prepare_payload();
- return res;
- };
- // Returns a not found response
- auto const not_found =
- [&req](beast::string_view target)
- {
- http::response<http::string_body> res{http::status::not_found, req.version()};
- res.set(http::field::server, BOOST_BEAST_VERSION_STRING);
- res.set(http::field::content_type, "text/html");
- res.keep_alive(req.keep_alive());
- res.body() = "The resource '" + std::string(target) + "' was not found.";
- res.prepare_payload();
- return res;
- };
- // Returns a server error response
- auto const server_error =
- [&req](beast::string_view what)
- {
- http::response<http::string_body> res{http::status::internal_server_error, req.version()};
- res.set(http::field::server, BOOST_BEAST_VERSION_STRING);
- res.set(http::field::content_type, "text/html");
- res.keep_alive(req.keep_alive());
- res.body() = "An error occurred: '" + std::string(what) + "'";
- res.prepare_payload();
- return res;
- };
- // Make sure we can handle the method
- if( req.method() != http::verb::get &&
- req.method() != http::verb::head)
- return send(bad_request("Unknown HTTP-method"));
- // Request path must be absolute and not contain "..".
- if( req.target().empty() ||
- req.target()[0] != '/' ||
- req.target().find("..") != beast::string_view::npos)
- return send(bad_request("Illegal request-target"));
- // Build the path to the requested file
- std::string path = path_cat(doc_root, req.target());
- if(req.target().back() == '/')
- path.append("index.html");
- // Attempt to open the file
- beast::error_code ec;
- http::file_body::value_type body;
- body.open(path.c_str(), beast::file_mode::scan, ec);
- // Handle the case where the file doesn't exist
- if(ec == beast::errc::no_such_file_or_directory)
- return send(not_found(req.target()));
- // Handle an unknown error
- if(ec)
- return send(server_error(ec.message()));
- // Cache the size since we need it after the move
- auto const size = body.size();
- // Respond to HEAD request
- if(req.method() == http::verb::head)
- {
- http::response<http::empty_body> res{http::status::ok, req.version()};
- res.set(http::field::server, BOOST_BEAST_VERSION_STRING);
- res.set(http::field::content_type, mime_type(path));
- res.content_length(size);
- res.keep_alive(req.keep_alive());
- return send(std::move(res));
- }
- // Respond to GET request
- http::response<http::file_body> res{
- std::piecewise_construct,
- std::make_tuple(std::move(body)),
- std::make_tuple(http::status::ok, req.version())};
- res.set(http::field::server, BOOST_BEAST_VERSION_STRING);
- res.set(http::field::content_type, mime_type(path));
- res.content_length(size);
- res.keep_alive(req.keep_alive());
- return send(std::move(res));
- }
- //------------------------------------------------------------------------------
- // Report a failure
- void
- fail(beast::error_code ec, char const* what)
- {
- std::cerr << what << ": " << ec.message() << "\n";
- }
- // This is the C++11 equivalent of a generic lambda.
- // The function object is used to send an HTTP message.
- template<class Stream>
- struct send_lambda
- {
- Stream& stream_;
- bool& close_;
- beast::error_code& ec_;
- explicit
- send_lambda(
- Stream& stream,
- bool& close,
- beast::error_code& ec)
- : stream_(stream)
- , close_(close)
- , ec_(ec)
- {
- }
- template<bool isRequest, class Body, class Fields>
- void
- operator()(http::message<isRequest, Body, Fields>&& msg) const
- {
- // Determine if we should close the connection after
- close_ = msg.need_eof();
- // We need the serializer here because the serializer requires
- // a non-const file_body, and the message oriented version of
- // http::write only works with const messages.
- http::serializer<isRequest, Body, Fields> sr{msg};
- http::write(stream_, sr, ec_);
- }
- };
- // Handles an HTTP server connection
- void
- do_session(
- tcp::socket& socket,
- ssl::context& ctx,
- std::shared_ptr<std::string const> const& doc_root)
- {
- bool close = false;
- beast::error_code ec;
- // Construct the stream around the socket
- beast::ssl_stream<tcp::socket&> stream{socket, ctx};
- // Perform the SSL handshake
- stream.handshake(ssl::stream_base::server, ec);
- if(ec)
- return fail(ec, "handshake");
- // This buffer is required to persist across reads
- beast::flat_buffer buffer;
- // This lambda is used to send messages
- send_lambda<beast::ssl_stream<tcp::socket&>> lambda{stream, close, ec};
- for(;;)
- {
- // Read a request
- http::request<http::string_body> req;
- http::read(stream, buffer, req, ec);
- if(ec == http::error::end_of_stream)
- break;
- if(ec)
- return fail(ec, "read");
- // Send the response
- handle_request(*doc_root, std::move(req), lambda);
- if(ec)
- return fail(ec, "write");
- if(close)
- {
- // This means we should close the connection, usually because
- // the response indicated the "Connection: close" semantic.
- break;
- }
- }
- // Perform the SSL shutdown
- stream.shutdown(ec);
- if(ec)
- return fail(ec, "shutdown");
- // At this point the connection is closed gracefully
- }
- //------------------------------------------------------------------------------
- int main(int argc, char* argv[])
- {
- try
- {
- // Check command line arguments.
- if (argc != 4)
- {
- std::cerr <<
- "Usage: http-server-sync-ssl <address> <port> <doc_root>\n" <<
- "Example:\n" <<
- " http-server-sync-ssl 0.0.0.0 8080 .\n";
- return EXIT_FAILURE;
- }
- auto const address = net::ip::make_address(argv[1]);
- auto const port = static_cast<unsigned short>(std::atoi(argv[2]));
- auto const doc_root = std::make_shared<std::string>(argv[3]);
- // The io_context is required for all I/O
- net::io_context ioc{1};
- // The SSL context is required, and holds certificates
- ssl::context ctx{ssl::context::tlsv12};
- // This holds the self-signed certificate used by the server
- load_server_certificate(ctx);
- // The acceptor receives incoming connections
- tcp::acceptor acceptor{ioc, {address, port}};
- for(;;)
- {
- // This will receive the new connection
- tcp::socket socket{ioc};
- // Block until we get a connection
- acceptor.accept(socket);
- // Launch the session, transferring ownership of the socket
- std::thread{std::bind(
- &do_session,
- std::move(socket),
- std::ref(ctx),
- doc_root)}.detach();
- }
- }
- catch (const std::exception& e)
- {
- std::cerr << "Error: " << e.what() << std::endl;
- return EXIT_FAILURE;
- }
- }
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