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cors.cpp
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//
// Copyright (c) 2025 Vinnie Falco (vinnie.falco@gmail.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/cppalliance/http
//
#include <boost/http/server/cors.hpp>
#include <utility>
namespace boost {
namespace http {
cors::
cors(
cors_options options) noexcept
: options_(std::move(options))
{
// VFALCO TODO Validate the strings in options against RFC
}
namespace {
struct Vary
{
Vary(route_params& rp)
: rp_(rp)
{
}
void set(field f, core::string_view s)
{
rp_.res.set(f, s);
}
void append(field f, core::string_view v)
{
auto it = rp_.res.find(f);
if(it != rp_.res.end())
{
std::string s = it->value;
s += ", ";
s += v;
rp_.res.set(it, s);
}
else
{
rp_.res.set(f, v);
}
}
private:
route_params& rp_;
};
} // (anon)
// Access-Control-Allow-Origin
static void setOrigin(
Vary& v,
route_params const&,
cors_options const& options)
{
if( options.origin.empty() ||
options.origin == "*")
{
v.set(field::access_control_allow_origin, "*");
return;
}
v.set(
field::access_control_allow_origin,
options.origin);
v.append(field::vary, to_string(field::origin));
}
// Access-Control-Allow-Methods
static void setMethods(
Vary& v,
cors_options const& options)
{
if(! options.methods.empty())
{
v.set(
field::access_control_allow_methods,
options.methods);
return;
}
v.set(
field::access_control_allow_methods,
"GET,HEAD,PUT,PATCH,POST,DELETE");
}
// Access-Control-Allow-Credentials
static void setCredentials(
Vary& v,
cors_options const& options)
{
if(! options.credentials)
return;
v.set(
field::access_control_allow_credentials,
"true");
}
// Access-Control-Allowed-Headers
static void setAllowedHeaders(
Vary& v,
route_params const& rp,
cors_options const& options)
{
if(! options.allowedHeaders.empty())
{
v.set(
field::access_control_allow_headers,
options.allowedHeaders);
return;
}
auto s = rp.req.value_or(
field::access_control_request_headers, "");
if(! s.empty())
{
v.set(field::access_control_allow_headers, s);
v.append(field::vary, s);
}
}
// Access-Control-Expose-Headers
static void setExposeHeaders(
Vary& v,
cors_options const& options)
{
if(options.exposedHeaders.empty())
return;
v.set(
field::access_control_expose_headers,
options.exposedHeaders);
}
// Access-Control-Max-Age
static void setMaxAge(
Vary& v,
cors_options const& options)
{
if(options.max_age.count() == 0)
return;
v.set(
field::access_control_max_age,
std::to_string(
options.max_age.count()));
}
route_task
cors::
operator()(
route_params& rp) const
{
Vary v(rp);
if(rp.req.method() == method::options)
{
// preflight
setOrigin(v, rp, options_);
setMethods(v, options_);
setCredentials(v, options_);
setAllowedHeaders(v, rp, options_);
setMaxAge(v, options_);
setExposeHeaders(v, options_);
if(options_.preFlightContinue)
co_return route_next;
// Safari and others need this for 204 or may hang
rp.res.set_status(options_.result);
auto [ec] = co_await rp.send("");
if(ec)
co_return route_error(ec);
co_return route_done;
}
// actual response
setOrigin(v, rp, options_);
setCredentials(v, options_);
setExposeHeaders(v, options_);
co_return route_next;
}
} // http
} // boost