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