@copilotkit/runtime/dist/v2/runtime/core/fetch-cors.cjs

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require("reflect-metadata");

//#region src/v2/runtime/core/fetch-cors.ts
const DEFAULT_METHODS = [
	"GET",
	"HEAD",
	"PUT",
	"POST",
	"DELETE",
	"PATCH",
	"OPTIONS"
];
const DEFAULT_HEADERS = ["*"];
function resolveOrigin(config, requestOrigin) {
	const { origin } = config;
	if (!origin) return "*";
	if (typeof origin === "string") return origin;
	if (Array.isArray(origin)) {
		if (!requestOrigin) return null;
		return origin.includes(requestOrigin) ? requestOrigin : null;
	}
	if (typeof origin === "function") return requestOrigin ? origin(requestOrigin) : null;
	return "*";
}
function setCorsHeaders(headers, config, requestOrigin) {
	let allowedOrigin = resolveOrigin(config, requestOrigin);
	if (!allowedOrigin) return;
	if (config.credentials && allowedOrigin === "*") if (requestOrigin) allowedOrigin = requestOrigin;
	else return;
	headers.set("Access-Control-Allow-Origin", allowedOrigin);
	if (config.credentials) headers.set("Access-Control-Allow-Credentials", "true");
	if (config.exposeHeaders?.length) headers.set("Access-Control-Expose-Headers", config.exposeHeaders.join(", "));
	if (allowedOrigin !== "*") headers.append("Vary", "Origin");
}
/**
* Handle CORS preflight (OPTIONS) requests.
* Returns a 204 Response if it's a preflight, or null if not.
*/
function handleCors(request, config) {
	if (request.method !== "OPTIONS") return null;
	const requestOrigin = request.headers.get("origin");
	const headers = new Headers();
	setCorsHeaders(headers, config, requestOrigin);
	const methods = config.allowMethods ?? DEFAULT_METHODS;
	headers.set("Access-Control-Allow-Methods", methods.join(", "));
	const allowHeaders = config.allowHeaders ?? DEFAULT_HEADERS;
	headers.set("Access-Control-Allow-Headers", allowHeaders.join(", "));
	if (config.maxAge != null) headers.set("Access-Control-Max-Age", String(config.maxAge));
	headers.append("Vary", "Access-Control-Request-Headers");
	headers.append("Vary", "Access-Control-Request-Method");
	return new Response(null, {
		status: 204,
		headers
	});
}
/**
* Add CORS headers to an existing response.
*/
function addCorsHeaders(response, config, requestOrigin) {
	const headers = new Headers(response.headers);
	setCorsHeaders(headers, config, requestOrigin);
	return new Response(response.body, {
		status: response.status,
		statusText: response.statusText,
		headers
	});
}

//#endregion
exports.addCorsHeaders = addCorsHeaders;
exports.handleCors = handleCors;
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