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import { sha256Hex } from "@/worker/auth/crypto";
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export function clientIp(request: Request): string | null {
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  const forwardedFor = request.headers.get("x-forwarded-for")?.split(",")[0]?.trim();
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  return request.headers.get("cf-connecting-ip") ?? forwardedFor ?? request.headers.get("x-real-ip") ?? null;
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}
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export async function hashNullable(value: string | null | undefined): Promise<string | null> {
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  return value ? await sha256Hex(value) : null;
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}
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export function pathPrefix(pathname: string): string {
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  const segment = pathname.split("/").filter(Boolean)[0];
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  return segment ? `/${segment}` : "/";
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}
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export function destinationHost(request: Request): string | null {
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  const destination = request.headers.get("destination");
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  if (!destination) return null;
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  try {
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    return new URL(destination).host;
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  } catch {
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    return null;
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  }
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}