forked from boostorg/beast
336 lines
11 KiB
C++
336 lines
11 KiB
C++
//
|
|
// 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 server, synchronous
|
|
//
|
|
//------------------------------------------------------------------------------
|
|
|
|
#include <boost/beast/core.hpp>
|
|
#include <boost/beast/http.hpp>
|
|
#include <boost/beast/version.hpp>
|
|
#include <boost/asio/ip/tcp.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>
|
|
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);
|
|
#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(
|
|
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,
|
|
std::shared_ptr<std::string const> const& doc_root)
|
|
{
|
|
bool close = false;
|
|
beast::error_code ec;
|
|
|
|
// This buffer is required to persist across reads
|
|
beast::flat_buffer buffer;
|
|
|
|
// This lambda is used to send messages
|
|
send_lambda<tcp::socket> lambda{socket, close, ec};
|
|
|
|
for(;;)
|
|
{
|
|
// Read a request
|
|
http::request<http::string_body> req;
|
|
http::read(socket, 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;
|
|
}
|
|
}
|
|
|
|
// Send a TCP shutdown
|
|
socket.shutdown(tcp::socket::shutdown_send, ec);
|
|
|
|
// 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 <address> <port> <doc_root>\n" <<
|
|
"Example:\n" <<
|
|
" http-server-sync 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 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),
|
|
doc_root)}.detach();
|
|
}
|
|
}
|
|
catch (const std::exception& e)
|
|
{
|
|
std::cerr << "Error: " << e.what() << std::endl;
|
|
return EXIT_FAILURE;
|
|
}
|
|
}
|