export const getEndpointFromRegion = async (input) => {
    const { tls = true } = input;
    const region = await input.region();
    const dnsHostRegex = new RegExp(/^([a-zA-Z0-9]|[a-zA-Z0-9][a-zA-Z0-9-]{0,61}[a-zA-Z0-9])$/);
    if (!dnsHostRegex.test(region)) {
        throw new Error("Invalid region in client config");
    }
    const useDualstackEndpoint = await input.useDualstackEndpoint();
    const useFipsEndpoint = await input.useFipsEndpoint();
    const { hostname } = (await input.regionInfoProvider(region, { useDualstackEndpoint, useFipsEndpoint })) ?? {};
    if (!hostname) {
        throw new Error("Cannot resolve hostname from client config");
    }
    return input.urlParser(`${tls ? "https:" : "http:"}//${hostname}`);
};