libs/beast/example/http/server/coro-ssl/http_server_coro_ssl.cpp
// // Copyright (c) 2016-2017 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, coroutine // //------------------------------------------------------------------------------ #include "example/common/server_certificate.hpp" #include <boost/beast/core.hpp> #include <boost/beast/http.hpp> #include <boost/beast/version.hpp> #include <boost/asio/ip/tcp.hpp> #include <boost/asio/spawn.hpp> #include <boost/asio/ssl/stream.hpp> #include <boost/config.hpp> #include <algorithm> #include <cstdlib> #include <iostream> #include <memory> #include <string> #include <thread> #include <vector> using tcp = boost::asio::ip::tcp; // from <boost/asio/ip/tcp.hpp> namespace ssl = boost::asio::ssl; // from <boost/asio/ssl.hpp> namespace http = boost::beast::http; // from <boost/beast/http.hpp> // Return a reasonable mime type based on the extension of a file. boost::beast::string_view mime_type(boost::beast::string_view path) { using boost::beast::iequals; auto const ext = [&path] { auto const pos = path.rfind("."); if(pos == boost::beast::string_view::npos) return boost::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( boost::beast::string_view base, boost::beast::string_view path) { if(base.empty()) return path.to_string(); std::string result = base.to_string(); #if 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( boost::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](boost::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() = why.to_string(); res.prepare_payload(); return res; }; // Returns a not found response auto const not_found = [&req](boost::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 '" + target.to_string() + "' was not found."; res.prepare_payload(); return res; }; // Returns a server error response auto const server_error = [&req](boost::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: '" + what.to_string() + "'"; 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("..") != boost::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 boost::beast::error_code ec; http::file_body::value_type body; body.open(path.c_str(), boost::beast::file_mode::scan, ec); // Handle the case where the file doesn't exist if(ec == boost::system::errc::no_such_file_or_directory) return send(not_found(req.target())); // Handle an unknown error if(ec) return send(server_error(ec.message())); // 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(body.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(body.size()); res.keep_alive(req.keep_alive()); return send(std::move(res)); } //------------------------------------------------------------------------------ // Report a failure void fail(boost::system::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_; boost::system::error_code& ec_; boost::asio::yield_context yield_; explicit send_lambda( Stream& stream, bool& close, boost::system::error_code& ec, boost::asio::yield_context yield) : stream_(stream) , close_(close) , ec_(ec) , yield_(yield) { } 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::async_write(stream_, sr, yield_[ec_]); } }; // Handles an HTTP server connection void do_session( tcp::socket& socket, ssl::context& ctx, std::string const& doc_root, boost::asio::yield_context yield) { bool close = false; boost::system::error_code ec; // Construct the stream around the socket ssl::stream<tcp::socket&> stream{socket, ctx}; // Perform the SSL handshake stream.async_handshake(ssl::stream_base::server, yield[ec]); if(ec) return fail(ec, "handshake"); // This buffer is required to persist across reads boost::beast::flat_buffer buffer; // This lambda is used to send messages send_lambda<ssl::stream<tcp::socket&>> lambda{stream, close, ec, yield}; for(;;) { // Read a request http::request<http::string_body> req; http::async_read(stream, buffer, req, yield[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.async_shutdown(yield[ec]); if(ec) return fail(ec, "shutdown"); // At this point the connection is closed gracefully } //------------------------------------------------------------------------------ // Accepts incoming connections and launches the sessions void do_listen( boost::asio::io_context& ioc, ssl::context& ctx, tcp::endpoint endpoint, std::string const& doc_root, boost::asio::yield_context yield) { boost::system::error_code ec; // Open the acceptor tcp::acceptor acceptor(ioc); acceptor.open(endpoint.protocol(), ec); if(ec) return fail(ec, "open"); // Bind to the server address acceptor.bind(endpoint, ec); if(ec) return fail(ec, "bind"); // Start listening for connections acceptor.listen(boost::asio::socket_base::max_listen_connections, ec); if(ec) return fail(ec, "listen"); for(;;) { tcp::socket socket(ioc); acceptor.async_accept(socket, yield[ec]); if(ec) fail(ec, "accept"); else boost::asio::spawn( acceptor.get_executor().context(), std::bind( &do_session, std::move(socket), std::ref(ctx), doc_root, std::placeholders::_1)); } } int main(int argc, char* argv[]) { // Check command line arguments. if (argc != 5) { std::cerr << "Usage: http-server-coro-ssl <address> <port> <doc_root> <threads>\n" << "Example:\n" << " http-server-coro-ssl 0.0.0.0 8080 . 1\n"; return EXIT_FAILURE; } auto const address = boost::asio::ip::make_address(argv[1]); auto const port = static_cast<unsigned short>(std::atoi(argv[2])); std::string const doc_root = argv[3]; auto const threads = std::max<int>(1, std::atoi(argv[4])); // The io_context is required for all I/O boost::asio::io_context ioc{threads}; // The SSL context is required, and holds certificates ssl::context ctx{ssl::context::sslv23}; // This holds the self-signed certificate used by the server load_server_certificate(ctx); // Spawn a listening port boost::asio::spawn(ioc, std::bind( &do_listen, std::ref(ioc), std::ref(ctx), tcp::endpoint{address, port}, doc_root, std::placeholders::_1)); // Run the I/O service on the requested number of threads std::vector<std::thread> v; v.reserve(threads - 1); for(auto i = threads - 1; i > 0; --i) v.emplace_back( [&ioc] { ioc.run(); }); ioc.run(); return EXIT_SUCCESS; }