// SPDX-License-Identifier: LGPL-3.0-or-later

// Copyright 2016-2025 Hristo Gochkov, Mathieu Carbou, Emil Muratov

#include <ESPAsyncWebServer.h>

const AsyncWebHeader AsyncWebHeader::parse(const char *data) {

// https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers

// In HTTP/1.X, a header is a case-insensitive name followed by a colon, then optional whitespace which will be ignored, and finally by its value

if (!data) {

return AsyncWebHeader(); // nullptr

}

if (data[0] == '\0') {

return AsyncWebHeader(); // empty string

}

if (strchr(data, '\n') || strchr(data, '\r')) {

return AsyncWebHeader(); // Invalid header format

}

const char *colon = strchr(data, ':');

if (!colon) {

return AsyncWebHeader(); // separator not found

}

if (colon == data) {

return AsyncWebHeader(); // Header name cannot be empty

}

const char *startOfValue = colon + 1; // Skip the colon

// skip one optional whitespace after the colon

if (*startOfValue == ' ') {

startOfValue++;

}

String name;

name.reserve(colon - data);

name.concat(data, colon - data);

return AsyncWebHeader(name, String(startOfValue));

}