import verifySha256 from "../jwt/verifySha256.ts";

export default (secret: Uint8Array) => (name: string) =>
  (
    (sha256) => (c: string | null) =>
      (
        (p) =>
          p !== -1
            ? sha256(
              //@ts-ignore
              c.slice(
                p + name.length + 1,
                //@ts-ignore
                (c.indexOf(",", p) + 1 || c.length + 1) - 1,
              ),
            )
            : null
      )(
        typeof c === "string" ? c.indexOf(name + "=") : -1,
      )
  )(
    verifySha256()(secret),
  );