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Copy pathmethod_utils.hpp
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67 lines (56 loc) · 2.48 KB
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/*
This file is part of libhttpserver
Copyright (C) 2011-2026 Sebastiano Merlino
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301
USA
*/
// Internal detail header. Strict gate: reachable only from libhttpserver
// translation units.
#if !defined(HTTPSERVER_COMPILATION)
#error "method_utils.hpp is internal; only reachable when compiling libhttpserver."
#endif
#ifndef SRC_HTTPSERVER_DETAIL_METHOD_UTILS_HPP_
#define SRC_HTTPSERVER_DETAIL_METHOD_UTILS_HPP_
#include <cstdint>
#include <string>
#include "httpserver/http_method.hpp"
namespace httpserver {
namespace detail {
// Shared free function for serializing a method_set into the
// comma-separated string value expected by the HTTP `Allow:` header.
//
// It takes only method_set (no webserver_impl* dependency) so it can
// be called from any TU that includes this header.
//
// Enum-declaration order: GET, HEAD, POST, PUT, DELETE, CONNECT,
// OPTIONS, TRACE, PATCH. The only existing assertion in-tree is
// "HEAD, POST" which is preserved by enum order.
inline std::string format_allow_header(method_set allowed) {
std::string header_value;
// Pre-size for 9 methods * ~8 chars each to avoid reallocation
// across the 9-method upper bound.
header_value.reserve(64);
for (std::uint8_t i = 0;
i < static_cast<std::uint8_t>(http_method::count_); ++i) {
auto m = static_cast<http_method>(i);
if (!allowed.contains(m)) continue;
if (!header_value.empty()) header_value += ", ";
// to_string returns string_view; operator+= on std::string accepts
// string_view directly -- no temporary std::string needed.
header_value += to_string(m);
}
return header_value;
}
} // namespace detail
} // namespace httpserver
#endif // SRC_HTTPSERVER_DETAIL_METHOD_UTILS_HPP_