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stream.ipp
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stream.ipp
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//
// Copyright (c) 2013-2016 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)
//
#ifndef BEAST_WEBSOCKET_IMPL_STREAM_IPP
#define BEAST_WEBSOCKET_IMPL_STREAM_IPP
#include <beast/websocket/teardown.hpp>
#include <beast/websocket/detail/hybi13.hpp>
#include <beast/websocket/impl/accept_op.ipp>
#include <beast/websocket/impl/close_op.ipp>
#include <beast/websocket/impl/handshake_op.ipp>
#include <beast/websocket/impl/ping_op.ipp>
#include <beast/websocket/impl/read_op.ipp>
#include <beast/websocket/impl/read_frame_op.ipp>
#include <beast/websocket/impl/response_op.ipp>
#include <beast/websocket/impl/write_op.ipp>
#include <beast/websocket/impl/write_frame_op.ipp>
#include <beast/http/read.hpp>
#include <beast/http/write.hpp>
#include <beast/http/reason.hpp>
#include <beast/http/rfc7230.hpp>
#include <beast/core/buffer_cat.hpp>
#include <beast/core/buffer_concepts.hpp>
#include <beast/core/consuming_buffers.hpp>
#include <beast/core/prepare_buffers.hpp>
#include <beast/core/static_streambuf.hpp>
#include <beast/core/stream_concepts.hpp>
#include <boost/endian/buffers.hpp>
#include <algorithm>
#include <cassert>
#include <memory>
#include <utility>
namespace beast {
namespace websocket {
namespace detail {
template<class _>
void
stream_base::open(role_type role)
{
role_ = role;
}
template<class _>
void
stream_base::prepare_fh(close_code::value& code)
{
// continuation without an active message
if(! rd_cont_ && rd_fh_.op == opcode::cont)
{
code = close_code::protocol_error;
return;
}
// new data frame when continuation expected
if(rd_cont_ && ! is_control(rd_fh_.op) &&
rd_fh_.op != opcode::cont)
{
code = close_code::protocol_error;
return;
}
if(rd_fh_.mask)
prepare_key(rd_key_, rd_fh_.key);
if(! is_control(rd_fh_.op))
{
if(rd_fh_.op != opcode::cont)
{
rd_size_ = rd_fh_.len;
rd_opcode_ = rd_fh_.op;
}
else
{
if(rd_size_ > std::numeric_limits<
std::uint64_t>::max() - rd_fh_.len)
{
code = close_code::too_big;
return;
}
rd_size_ += rd_fh_.len;
}
if(rd_msg_max_ && rd_size_ > rd_msg_max_)
{
code = close_code::too_big;
return;
}
rd_need_ = rd_fh_.len;
rd_cont_ = ! rd_fh_.fin;
}
}
template<class DynamicBuffer>
void
stream_base::write_close(
DynamicBuffer& db, close_reason const& cr)
{
using namespace boost::endian;
frame_header fh;
fh.op = opcode::close;
fh.fin = true;
fh.rsv1 = false;
fh.rsv2 = false;
fh.rsv3 = false;
fh.len = cr.code == close_code::none ?
0 : 2 + cr.reason.size();
fh.mask = role_ == detail::role_type::client;
if(fh.mask)
fh.key = maskgen_();
detail::write(db, fh);
if(cr.code != close_code::none)
{
detail::prepared_key_type key;
if(fh.mask)
detail::prepare_key(key, fh.key);
{
std::uint8_t b[2];
::new(&b[0]) big_uint16_buf_t{
(std::uint16_t)cr.code};
auto d = db.prepare(2);
boost::asio::buffer_copy(d,
boost::asio::buffer(b));
if(fh.mask)
detail::mask_inplace(d, key);
db.commit(2);
}
if(! cr.reason.empty())
{
auto d = db.prepare(cr.reason.size());
boost::asio::buffer_copy(d,
boost::asio::const_buffer(
cr.reason.data(), cr.reason.size()));
if(fh.mask)
detail::mask_inplace(d, key);
db.commit(cr.reason.size());
}
}
}
template<class DynamicBuffer>
void
stream_base::write_ping(DynamicBuffer& db,
opcode op, ping_data const& data)
{
frame_header fh;
fh.op = op;
fh.fin = true;
fh.rsv1 = false;
fh.rsv2 = false;
fh.rsv3 = false;
fh.len = data.size();
fh.mask = role_ == role_type::client;
if(fh.mask)
fh.key = maskgen_();
detail::write(db, fh);
if(data.empty())
return;
detail::prepared_key_type key;
if(fh.mask)
detail::prepare_key(key, fh.key);
auto d = db.prepare(data.size());
boost::asio::buffer_copy(d,
boost::asio::const_buffers_1(
data.data(), data.size()));
if(fh.mask)
detail::mask_inplace(d, key);
db.commit(data.size());
}
} // detail
//------------------------------------------------------------------------------
template<class NextLayer>
template<class... Args>
stream<NextLayer>::
stream(Args&&... args)
: stream_(std::forward<Args>(args)...)
{
}
template<class NextLayer>
void
stream<NextLayer>::
accept()
{
static_assert(is_SyncStream<next_layer_type>::value,
"SyncStream requirements not met");
error_code ec;
accept(boost::asio::null_buffers{}, ec);
if(ec)
throw system_error{ec};
}
template<class NextLayer>
void
stream<NextLayer>::
accept(error_code& ec)
{
static_assert(is_SyncStream<next_layer_type>::value,
"SyncStream requirements not met");
accept(boost::asio::null_buffers{}, ec);
}
template<class NextLayer>
template<class AcceptHandler>
typename async_completion<
AcceptHandler, void(error_code)>::result_type
stream<NextLayer>::
async_accept(AcceptHandler&& handler)
{
static_assert(is_AsyncStream<next_layer_type>::value,
"AsyncStream requirements requirements not met");
return async_accept(boost::asio::null_buffers{},
std::forward<AcceptHandler>(handler));
}
template<class NextLayer>
template<class ConstBufferSequence>
void
stream<NextLayer>::
accept(ConstBufferSequence const& buffers)
{
static_assert(is_SyncStream<next_layer_type>::value,
"SyncStream requirements not met");
static_assert(is_ConstBufferSequence<
ConstBufferSequence>::value,
"ConstBufferSequence requirements not met");
error_code ec;
accept(buffers, ec);
if(ec)
throw system_error{ec};
}
template<class NextLayer>
template<class ConstBufferSequence>
void
stream<NextLayer>::
accept(ConstBufferSequence const& buffers, error_code& ec)
{
static_assert(is_SyncStream<next_layer_type>::value,
"SyncStream requirements not met");
static_assert(beast::is_ConstBufferSequence<
ConstBufferSequence>::value,
"ConstBufferSequence requirements not met");
using boost::asio::buffer_copy;
using boost::asio::buffer_size;
reset();
stream_.buffer().commit(buffer_copy(
stream_.buffer().prepare(
buffer_size(buffers)), buffers));
http::request_v1<http::string_body> m;
http::read(next_layer(), stream_.buffer(), m, ec);
if(ec)
return;
accept(m, ec);
}
template<class NextLayer>
template<class ConstBufferSequence, class AcceptHandler>
typename async_completion<
AcceptHandler, void(error_code)>::result_type
stream<NextLayer>::
async_accept(ConstBufferSequence const& bs, AcceptHandler&& handler)
{
static_assert(is_AsyncStream<next_layer_type>::value,
"AsyncStream requirements requirements not met");
static_assert(beast::is_ConstBufferSequence<
ConstBufferSequence>::value,
"ConstBufferSequence requirements not met");
beast::async_completion<
AcceptHandler, void(error_code)
> completion(handler);
accept_op<decltype(completion.handler)>{
completion.handler, *this, bs};
return completion.result.get();
}
template<class NextLayer>
template<class Body, class Headers>
void
stream<NextLayer>::
accept(http::request_v1<Body, Headers> const& request)
{
static_assert(is_SyncStream<next_layer_type>::value,
"SyncStream requirements not met");
error_code ec;
accept(request, ec);
if(ec)
throw system_error{ec};
}
template<class NextLayer>
template<class Body, class Headers>
void
stream<NextLayer>::
accept(http::request_v1<Body, Headers> const& req,
error_code& ec)
{
static_assert(is_SyncStream<next_layer_type>::value,
"SyncStream requirements not met");
reset();
auto const res = build_response(req);
http::write(stream_, res, ec);
if(ec)
return;
if(res.status != 101)
{
ec = error::handshake_failed;
// VFALCO TODO Respect keep alive setting, perform
// teardown if Connection: close.
return;
}
open(detail::role_type::server);
}
template<class NextLayer>
template<class Body, class Headers, class AcceptHandler>
typename async_completion<
AcceptHandler, void(error_code)>::result_type
stream<NextLayer>::
async_accept(http::request_v1<Body, Headers> const& req,
AcceptHandler&& handler)
{
static_assert(is_AsyncStream<next_layer_type>::value,
"AsyncStream requirements requirements not met");
beast::async_completion<
AcceptHandler, void(error_code)
> completion(handler);
reset();
response_op<decltype(completion.handler)>{
completion.handler, *this, req,
boost_asio_handler_cont_helpers::
is_continuation(completion.handler)};
return completion.result.get();
}
template<class NextLayer>
void
stream<NextLayer>::
handshake(boost::string_ref const& host,
boost::string_ref const& resource)
{
static_assert(is_SyncStream<next_layer_type>::value,
"SyncStream requirements not met");
error_code ec;
handshake(host, resource, ec);
if(ec)
throw system_error{ec};
}
template<class NextLayer>
void
stream<NextLayer>::
handshake(boost::string_ref const& host,
boost::string_ref const& resource, error_code& ec)
{
static_assert(is_SyncStream<next_layer_type>::value,
"SyncStream requirements not met");
reset();
std::string key;
http::write(stream_,
build_request(host, resource, key), ec);
if(ec)
return;
http::response_v1<http::string_body> res;
http::read(next_layer(), stream_.buffer(), res, ec);
if(ec)
return;
do_response(res, key, ec);
}
template<class NextLayer>
template<class HandshakeHandler>
typename async_completion<
HandshakeHandler, void(error_code)>::result_type
stream<NextLayer>::
async_handshake(boost::string_ref const& host,
boost::string_ref const& resource, HandshakeHandler&& handler)
{
static_assert(is_AsyncStream<next_layer_type>::value,
"AsyncStream requirements not met");
beast::async_completion<
HandshakeHandler, void(error_code)
> completion(handler);
handshake_op<decltype(completion.handler)>{
completion.handler, *this, host, resource};
return completion.result.get();
}
template<class NextLayer>
void
stream<NextLayer>::
close(close_reason const& cr)
{
static_assert(is_SyncStream<next_layer_type>::value,
"SyncStream requirements not met");
error_code ec;
close(cr, ec);
if(ec)
throw system_error{ec};
}
template<class NextLayer>
void
stream<NextLayer>::
close(close_reason const& cr, error_code& ec)
{
static_assert(is_SyncStream<next_layer_type>::value,
"SyncStream requirements not met");
assert(! wr_close_);
wr_close_ = true;
detail::frame_streambuf fb;
write_close<static_streambuf>(fb, cr);
boost::asio::write(stream_, fb.data(), ec);
failed_ = ec != 0;
}
template<class NextLayer>
template<class CloseHandler>
typename async_completion<
CloseHandler, void(error_code)>::result_type
stream<NextLayer>::
async_close(close_reason const& cr, CloseHandler&& handler)
{
static_assert(is_AsyncStream<next_layer_type>::value,
"AsyncStream requirements not met");
beast::async_completion<
CloseHandler, void(error_code)
> completion(handler);
close_op<decltype(completion.handler)>{
completion.handler, *this, cr};
return completion.result.get();
}
template<class NextLayer>
void
stream<NextLayer>::
ping(ping_data const& payload)
{
error_code ec;
ping(payload, ec);
if(ec)
throw system_error{ec};
}
template<class NextLayer>
void
stream<NextLayer>::
ping(ping_data const& payload, error_code& ec)
{
detail::frame_streambuf db;
write_ping<static_streambuf>(
db, opcode::ping, payload);
boost::asio::write(stream_, db.data(), ec);
}
template<class NextLayer>
template<class PingHandler>
typename async_completion<
PingHandler, void(error_code)>::result_type
stream<NextLayer>::
async_ping(ping_data const& payload, PingHandler&& handler)
{
static_assert(is_AsyncStream<next_layer_type>::value,
"AsyncStream requirements requirements not met");
beast::async_completion<
PingHandler, void(error_code)
> completion(handler);
ping_op<decltype(completion.handler)>{
completion.handler, *this, payload};
return completion.result.get();
}
template<class NextLayer>
template<class DynamicBuffer>
void
stream<NextLayer>::
read(opcode& op, DynamicBuffer& dynabuf)
{
static_assert(is_SyncStream<next_layer_type>::value,
"SyncStream requirements not met");
static_assert(beast::is_DynamicBuffer<DynamicBuffer>::value,
"DynamicBuffer requirements not met");
error_code ec;
read(op, dynabuf, ec);
if(ec)
throw system_error{ec};
}
template<class NextLayer>
template<class DynamicBuffer>
void
stream<NextLayer>::
read(opcode& op, DynamicBuffer& dynabuf, error_code& ec)
{
static_assert(is_SyncStream<next_layer_type>::value,
"SyncStream requirements not met");
static_assert(beast::is_DynamicBuffer<DynamicBuffer>::value,
"DynamicBuffer requirements not met");
frame_info fi;
for(;;)
{
read_frame(fi, dynabuf, ec);
if(ec)
break;
op = fi.op;
if(fi.fin)
break;
}
}
template<class NextLayer>
template<class DynamicBuffer, class ReadHandler>
typename async_completion<
ReadHandler, void(error_code)>::result_type
stream<NextLayer>::
async_read(opcode& op,
DynamicBuffer& dynabuf, ReadHandler&& handler)
{
static_assert(is_AsyncStream<next_layer_type>::value,
"AsyncStream requirements requirements not met");
static_assert(beast::is_DynamicBuffer<DynamicBuffer>::value,
"DynamicBuffer requirements not met");
beast::async_completion<
ReadHandler, void(error_code)
> completion(handler);
read_op<DynamicBuffer, decltype(completion.handler)>{
completion.handler, *this, op, dynabuf};
return completion.result.get();
}
template<class NextLayer>
template<class DynamicBuffer>
void
stream<NextLayer>::
read_frame(frame_info& fi, DynamicBuffer& dynabuf)
{
static_assert(is_SyncStream<next_layer_type>::value,
"SyncStream requirements not met");
static_assert(beast::is_DynamicBuffer<DynamicBuffer>::value,
"DynamicBuffer requirements not met");
error_code ec;
read_frame(fi, dynabuf, ec);
if(ec)
throw system_error{ec};
}
template<class NextLayer>
template<class DynamicBuffer>
void
stream<NextLayer>::
read_frame(frame_info& fi, DynamicBuffer& dynabuf, error_code& ec)
{
static_assert(is_SyncStream<next_layer_type>::value,
"SyncStream requirements not met");
static_assert(beast::is_DynamicBuffer<DynamicBuffer>::value,
"DynamicBuffer requirements not met");
close_code::value code{};
for(;;)
{
if(rd_need_ == 0)
{
// read header
detail::frame_streambuf fb;
do_read_fh(fb, code, ec);
failed_ = ec != 0;
if(failed_)
return;
if(code != close_code::none)
break;
if(detail::is_control(rd_fh_.op))
{
// read control payload
if(rd_fh_.len > 0)
{
auto const mb = fb.prepare(
static_cast<std::size_t>(rd_fh_.len));
fb.commit(boost::asio::read(stream_, mb, ec));
failed_ = ec != 0;
if(failed_)
return;
if(rd_fh_.mask)
detail::mask_inplace(mb, rd_key_);
fb.commit(static_cast<std::size_t>(rd_fh_.len));
}
if(rd_fh_.op == opcode::ping)
{
ping_data data;
detail::read(data, fb.data());
fb.reset();
write_ping<static_streambuf>(
fb, opcode::pong, data);
boost::asio::write(stream_, fb.data(), ec);
failed_ = ec != 0;
if(failed_)
return;
continue;
}
else if(rd_fh_.op == opcode::pong)
{
ping_data payload;
detail::read(payload, fb.data());
if(pong_cb_)
pong_cb_(payload);
continue;
}
assert(rd_fh_.op == opcode::close);
{
detail::read(cr_, fb.data(), code);
if(code != close_code::none)
break;
if(! wr_close_)
{
auto cr = cr_;
if(cr.code == close_code::none)
cr.code = close_code::normal;
cr.reason = "";
fb.reset();
wr_close_ = true;
write_close<static_streambuf>(fb, cr);
boost::asio::write(stream_, fb.data(), ec);
failed_ = ec != 0;
if(failed_)
return;
}
break;
}
}
if(rd_need_ == 0 && ! rd_fh_.fin)
{
// empty frame
continue;
}
}
// read payload
auto smb = dynabuf.prepare(
detail::clamp(rd_need_));
auto const bytes_transferred =
stream_.read_some(smb, ec);
failed_ = ec != 0;
if(failed_)
return;
rd_need_ -= bytes_transferred;
auto const pb = prepare_buffers(
bytes_transferred, smb);
if(rd_fh_.mask)
detail::mask_inplace(pb, rd_key_);
if(rd_opcode_ == opcode::text)
{
if(! rd_utf8_check_.write(pb) ||
(rd_need_ == 0 && rd_fh_.fin &&
! rd_utf8_check_.finish()))
{
code = close_code::bad_payload;
break;
}
}
dynabuf.commit(bytes_transferred);
fi.op = rd_opcode_;
fi.fin = rd_fh_.fin && rd_need_ == 0;
return;
}
if(code != close_code::none)
{
// Fail the connection (per rfc6455)
if(! wr_close_)
{
wr_close_ = true;
detail::frame_streambuf fb;
write_close<static_streambuf>(fb, code);
boost::asio::write(stream_, fb.data(), ec);
failed_ = ec != 0;
if(failed_)
return;
}
websocket_helpers::call_teardown(next_layer(), ec);
failed_ = ec != 0;
if(failed_)
return;
ec = error::failed;
failed_ = true;
return;
}
if(! ec)
websocket_helpers::call_teardown(next_layer(), ec);
if(! ec)
ec = error::closed;
failed_ = ec != 0;
}
template<class NextLayer>
template<class DynamicBuffer, class ReadHandler>
typename async_completion<
ReadHandler, void(error_code)>::result_type
stream<NextLayer>::
async_read_frame(frame_info& fi,
DynamicBuffer& dynabuf, ReadHandler&& handler)
{
static_assert(is_AsyncStream<next_layer_type>::value,
"AsyncStream requirements requirements not met");
static_assert(beast::is_DynamicBuffer<DynamicBuffer>::value,
"DynamicBuffer requirements not met");
beast::async_completion<
ReadHandler, void(error_code)> completion(handler);
read_frame_op<DynamicBuffer, decltype(completion.handler)>{
completion.handler, *this, fi, dynabuf};
return completion.result.get();
}
template<class NextLayer>
template<class ConstBufferSequence>
void
stream<NextLayer>::
write(ConstBufferSequence const& buffers)
{
static_assert(is_SyncStream<next_layer_type>::value,
"SyncStream requirements not met");
static_assert(beast::is_ConstBufferSequence<
ConstBufferSequence>::value,
"ConstBufferSequence requirements not met");
error_code ec;
write(buffers, ec);
if(ec)
throw system_error{ec};
}
template<class NextLayer>
template<class ConstBufferSequence>
void
stream<NextLayer>::
write(ConstBufferSequence const& bs, error_code& ec)
{
static_assert(is_SyncStream<next_layer_type>::value,
"SyncStream requirements not met");
static_assert(beast::is_ConstBufferSequence<
ConstBufferSequence>::value,
"ConstBufferSequence requirements not met");
using boost::asio::buffer_size;
consuming_buffers<ConstBufferSequence> cb(bs);
auto remain = buffer_size(cb);
for(;;)
{
auto const n =
detail::clamp(remain, wr_frag_size_);
remain -= n;
auto const fin = remain <= 0;
write_frame(fin, prepare_buffers(n, cb), ec);
cb.consume(n);
if(ec)
return;
if(fin)
break;
}
}
template<class NextLayer>
template<class ConstBufferSequence, class WriteHandler>
typename async_completion<
WriteHandler, void(error_code)>::result_type
stream<NextLayer>::
async_write(ConstBufferSequence const& bs, WriteHandler&& handler)
{
static_assert(is_AsyncStream<next_layer_type>::value,
"AsyncStream requirements not met");
static_assert(beast::is_ConstBufferSequence<
ConstBufferSequence>::value,
"ConstBufferSequence requirements not met");
beast::async_completion<
WriteHandler, void(error_code)> completion(handler);
write_op<ConstBufferSequence, decltype(completion.handler)>{
completion.handler, *this, bs};
return completion.result.get();
}
template<class NextLayer>
template<class ConstBufferSequence>
void
stream<NextLayer>::
write_frame(bool fin, ConstBufferSequence const& buffers)
{
static_assert(is_SyncStream<next_layer_type>::value,
"SyncStream requirements not met");
static_assert(beast::is_ConstBufferSequence<
ConstBufferSequence>::value,
"ConstBufferSequence requirements not met");
error_code ec;
write_frame(fin, buffers, ec);
if(ec)
throw system_error{ec};
}
template<class NextLayer>
template<class ConstBufferSequence>
void
stream<NextLayer>::
write_frame(bool fin, ConstBufferSequence const& bs, error_code& ec)
{
static_assert(is_SyncStream<next_layer_type>::value,
"SyncStream requirements not met");
static_assert(beast::is_ConstBufferSequence<
ConstBufferSequence>::value,
"ConstBufferSequence requirements not met");
using boost::asio::buffer_copy;
using boost::asio::buffer_size;
using boost::asio::mutable_buffers_1;
detail::frame_header fh;
fh.op = wr_cont_ ? opcode::cont : wr_opcode_;
wr_cont_ = ! fin;
fh.fin = fin;
fh.rsv1 = false;
fh.rsv2 = false;
fh.rsv3 = false;
fh.len = buffer_size(bs);
fh.mask = role_ == detail::role_type::client;
if(fh.mask)
fh.key = maskgen_();
detail::fh_streambuf fh_buf;
detail::write<static_streambuf>(fh_buf, fh);
if(! fh.mask)
{
// send header and payload
boost::asio::write(stream_,
buffer_cat(fh_buf.data(), bs), ec);
failed_ = ec != 0;
return;
}
detail::prepared_key_type key;
detail::prepare_key(key, fh.key);
auto const tmp_size =
detail::clamp(fh.len, mask_buf_size_);
std::unique_ptr<std::uint8_t[]> up(
new std::uint8_t[tmp_size]);
std::uint64_t remain = fh.len;
consuming_buffers<ConstBufferSequence> cb(bs);
{
auto const n =
detail::clamp(remain, tmp_size);
mutable_buffers_1 mb{up.get(), n};
buffer_copy(mb, cb);
cb.consume(n);
remain -= n;
detail::mask_inplace(mb, key);
// send header and payload
boost::asio::write(stream_,
buffer_cat(fh_buf.data(), mb), ec);
if(ec)
{
failed_ = ec != 0;
return;
}
}
while(remain > 0)
{
auto const n =
detail::clamp(remain, tmp_size);
mutable_buffers_1 mb{up.get(), n};
buffer_copy(mb, cb);
cb.consume(n);
remain -= n;
detail::mask_inplace(mb, key);
// send payload
boost::asio::write(stream_, mb, ec);
if(ec)
{
failed_ = ec != 0;
return;
}
}
}
template<class NextLayer>
template<class ConstBufferSequence, class WriteHandler>
typename async_completion<
WriteHandler, void(error_code)>::result_type
stream<NextLayer>::
async_write_frame(bool fin,
ConstBufferSequence const& bs, WriteHandler&& handler)
{
static_assert(is_AsyncStream<next_layer_type>::value,
"AsyncStream requirements not met");
static_assert(beast::is_ConstBufferSequence<
ConstBufferSequence>::value,
"ConstBufferSequence requirements not met");
beast::async_completion<
WriteHandler, void(error_code)
> completion(handler);
write_frame_op<ConstBufferSequence, decltype(
completion.handler)>{completion.handler,
*this, fin, bs};
return completion.result.get();
}
//------------------------------------------------------------------------------
template<class NextLayer>
void
stream<NextLayer>::
reset()
{
failed_ = false;
rd_need_ = 0;
rd_cont_ = false;
wr_close_ = false;
wr_cont_ = false;
wr_block_ = nullptr; // should be nullptr on close anyway
pong_data_ = nullptr; // should be nullptr on close anyway
stream_.buffer().consume(
stream_.buffer().size());
}
template<class NextLayer>
http::request_v1<http::empty_body>
stream<NextLayer>::
build_request(boost::string_ref const& host,
boost::string_ref const& resource, std::string& key)
{
http::request_v1<http::empty_body> req;
req.url = "/";
req.version = 11;
req.method = "GET";
req.headers.insert("Host", host);
req.headers.insert("Upgrade", "websocket");
key = detail::make_sec_ws_key(maskgen_);
req.headers.insert("Sec-WebSocket-Key", key);
req.headers.insert("Sec-WebSocket-Version", "13");
(*d_)(req);
http::prepare(req, http::connection::upgrade);
return req;
}
template<class NextLayer>
template<class Body, class Headers>
http::response_v1<http::string_body>
stream<NextLayer>::
build_response(http::request_v1<Body, Headers> const& req)
{
auto err =
[&](std::string const& text)
{
http::response_v1<http::string_body> res;
res.status = 400;
res.reason = http::reason_string(res.status);
res.version = req.version;
res.body = text;
(*d_)(res);
prepare(res,
(is_keep_alive(req) && keep_alive_) ?
http::connection::keep_alive :
http::connection::close);
return res;
};
if(req.version < 11)
return err("HTTP version 1.1 required");
if(req.method != "GET")
return err("Wrong method");
if(! is_upgrade(req))
return err("Expected Upgrade request");
if(! req.headers.exists("Host"))
return err("Missing Host");
if(! req.headers.exists("Sec-WebSocket-Key"))
return err("Missing Sec-WebSocket-Key");
if(! http::token_list{req.headers["Upgrade"]}.exists("websocket"))
return err("Missing websocket Upgrade token");
{
auto const version =
req.headers["Sec-WebSocket-Version"];
if(version.empty())
return err("Missing Sec-WebSocket-Version");
if(version != "13")
{
http::response_v1<http::string_body> res;
res.status = 426;
res.reason = http::reason_string(res.status);
res.version = req.version;
res.headers.insert("Sec-WebSocket-Version", "13");
prepare(res,
(is_keep_alive(req) && keep_alive_) ?
http::connection::keep_alive :
http::connection::close);
return res;
}
}
http::response_v1<http::string_body> res;
res.status = 101;
res.reason = http::reason_string(res.status);
res.version = req.version;
res.headers.insert("Upgrade", "websocket");
{
auto const key =
req.headers["Sec-WebSocket-Key"];
res.headers.insert("Sec-WebSocket-Accept",
detail::make_sec_ws_accept(key));
}
res.headers.replace("Server", "Beast.WSProto");
(*d_)(res);