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boost_beast/include/beast/http/impl/message.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_HTTP_IMPL_MESSAGE_IPP
#define BEAST_HTTP_IMPL_MESSAGE_IPP
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#include <beast/core/error.hpp>
#include <beast/http/concepts.hpp>
#include <beast/http/rfc7230.hpp>
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#include <beast/core/detail/ci_char_traits.hpp>
#include <beast/core/detail/type_traits.hpp>
#include <boost/assert.hpp>
#include <boost/optional.hpp>
#include <stdexcept>
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namespace beast {
namespace http {
template<class Fields>
void
swap(
header<true, Fields>& m1,
header<true, Fields>& m2)
{
using std::swap;
swap(m1.version, m2.version);
swap(m1.method, m2.method);
swap(m1.url, m2.url);
swap(m1.fields, m2.fields);
}
template<class Fields>
void
swap(
header<false, Fields>& a,
header<false, Fields>& b)
{
using std::swap;
swap(a.version, b.version);
swap(a.status, b.status);
swap(a.reason, b.reason);
swap(a.fields, b.fields);
}
template<bool isRequest, class Body, class Fields>
void
swap(
message<isRequest, Body, Fields>& m1,
message<isRequest, Body, Fields>& m2)
{
using std::swap;
swap(m1.base(), m2.base());
swap(m1.body, m2.body);
}
template<bool isRequest, class Fields>
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bool
is_keep_alive(header<isRequest, Fields> const& msg)
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{
BOOST_ASSERT(msg.version == 10 || msg.version == 11);
if(msg.version == 11)
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{
if(token_list{msg.fields["Connection"]}.exists("close"))
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return false;
return true;
}
if(token_list{msg.fields["Connection"]}.exists("keep-alive"))
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return true;
return false;
}
template<bool isRequest, class Fields>
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bool
is_upgrade(header<isRequest, Fields> const& msg)
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{
BOOST_ASSERT(msg.version == 10 || msg.version == 11);
if(msg.version == 10)
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return false;
if(token_list{msg.fields["Connection"]}.exists("upgrade"))
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return true;
return false;
}
namespace detail {
struct prepare_info
{
boost::optional<connection> connection_value;
boost::optional<std::uint64_t> content_length;
};
template<bool isRequest, class Body, class Fields>
inline
void
prepare_options(prepare_info& pi,
message<isRequest, Body, Fields>& msg)
{
beast::detail::ignore_unused(pi, msg);
}
template<bool isRequest, class Body, class Fields>
void
prepare_option(prepare_info& pi,
message<isRequest, Body, Fields>& msg,
connection value)
{
beast::detail::ignore_unused(msg);
pi.connection_value = value;
}
template<
bool isRequest, class Body, class Fields,
class Opt, class... Opts>
void
prepare_options(prepare_info& pi,
message<isRequest, Body, Fields>& msg,
Opt&& opt, Opts&&... opts)
{
prepare_option(pi, msg, opt);
prepare_options(pi, msg,
std::forward<Opts>(opts)...);
}
template<bool isRequest, class Body, class Fields>
void
prepare_content_length(prepare_info& pi,
message<isRequest, Body, Fields> const& msg,
std::true_type)
{
typename Body::writer w(msg);
// VFALCO This is a design problem!
error_code ec;
w.init(ec);
if(ec)
throw system_error{ec};
pi.content_length = w.content_length();
}
template<bool isRequest, class Body, class Fields>
void
prepare_content_length(prepare_info& pi,
message<isRequest, Body, Fields> const& msg,
std::false_type)
{
beast::detail::ignore_unused(msg);
pi.content_length = boost::none;
}
} // detail
template<
bool isRequest, class Body, class Fields,
class... Options>
void
prepare(message<isRequest, Body, Fields>& msg,
Options&&... options)
{
using beast::detail::make_exception;
// VFALCO TODO
static_assert(is_Body<Body>::value,
"Body requirements not met");
static_assert(has_writer<Body>::value,
"Body has no writer");
static_assert(is_Writer<typename Body::writer,
message<isRequest, Body, Fields>>::value,
"Writer requirements not met");
detail::prepare_info pi;
detail::prepare_content_length(pi, msg,
detail::has_content_length<typename Body::writer>{});
detail::prepare_options(pi, msg,
std::forward<Options>(options)...);
if(msg.fields.exists("Connection"))
throw make_exception<std::invalid_argument>(
"prepare called with Connection field set", __FILE__, __LINE__);
if(msg.fields.exists("Content-Length"))
throw make_exception<std::invalid_argument>(
"prepare called with Content-Length field set", __FILE__, __LINE__);
if(token_list{msg.fields["Transfer-Encoding"]}.exists("chunked"))
throw make_exception<std::invalid_argument>(
"prepare called with Transfer-Encoding: chunked set", __FILE__, __LINE__);
if(pi.connection_value != connection::upgrade)
{
if(pi.content_length)
{
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struct set_field
{
void
operator()(message<true, Body, Fields>& msg,
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detail::prepare_info const& pi) const
{
using beast::detail::ci_equal;
if(*pi.content_length > 0 ||
ci_equal(msg.method, "POST"))
{
msg.fields.insert(
"Content-Length", *pi.content_length);
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}
}
void
operator()(message<false, Body, Fields>& msg,
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detail::prepare_info const& pi) const
{
if((msg.status / 100 ) != 1 &&
msg.status != 204 &&
msg.status != 304)
{
msg.fields.insert(
"Content-Length", *pi.content_length);
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}
}
};
set_field{}(msg, pi);
}
else if(msg.version >= 11)
{
msg.fields.insert("Transfer-Encoding", "chunked");
}
}
auto const content_length =
msg.fields.exists("Content-Length");
if(pi.connection_value)
{
switch(*pi.connection_value)
{
case connection::upgrade:
msg.fields.insert("Connection", "upgrade");
break;
case connection::keep_alive:
if(msg.version < 11)
{
if(content_length)
msg.fields.insert("Connection", "keep-alive");
}
break;
case connection::close:
if(msg.version >= 11)
msg.fields.insert("Connection", "close");
break;
}
}
// rfc7230 6.7.
if(msg.version < 11 && token_list{
msg.fields["Connection"]}.exists("upgrade"))
throw make_exception<std::invalid_argument>(
"invalid version for Connection: upgrade", __FILE__, __LINE__);
}
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} // http
} // beast
#endif