libhttpserver/src/httpserver/detail/method_utils.hpp at master · etr/libhttpserver · GitHub

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This file is part of libhttpserver

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_

libhttpserver/src/httpserver/detail/method_utils.hpp at master · etr/libhttpserver · GitHub

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