@gaonengwww/jose/dist/webapi/util/decode_protected_header.js

JWA, JWS, JWE, JWT, JWK, JWKS for Node.js, Browser, Cloudflare Workers, Deno, Bun, and other Web-interoperable runtimes

// src/lib/buffer_utils.ts
var encoder = new TextEncoder();
var decoder = new TextDecoder();
var MAX_INT32 = 2 ** 32;

// src/lib/base64.ts
function decodeBase64(encoded) {
  if (Uint8Array.fromBase64) {
    return Uint8Array.fromBase64(encoded);
  }
  const binary = atob(encoded);
  const bytes = new Uint8Array(binary.length);
  for (let i = 0; i < binary.length; i++) {
    bytes[i] = binary.charCodeAt(i);
  }
  return bytes;
}

// src/util/base64url.ts
function decode(input) {
  if (Uint8Array.fromBase64) {
    return Uint8Array.fromBase64(typeof input === "string" ? input : decoder.decode(input), {
      alphabet: "base64url"
    });
  }
  let encoded = input;
  if (encoded instanceof Uint8Array) {
    encoded = decoder.decode(encoded);
  }
  encoded = encoded.replace(/-/g, "+").replace(/_/g, "/").replace(/\s/g, "");
  try {
    return decodeBase64(encoded);
  } catch {
    throw new TypeError("The input to be decoded is not correctly encoded.");
  }
}

// src/lib/is_object.ts
function isObjectLike(value) {
  return typeof value === "object" && value !== null;
}
var is_object_default = (input) => {
  if (!isObjectLike(input) || Object.prototype.toString.call(input) !== "[object Object]") {
    return false;
  }
  if (Object.getPrototypeOf(input) === null) {
    return true;
  }
  let proto = input;
  while (Object.getPrototypeOf(proto) !== null) {
    proto = Object.getPrototypeOf(proto);
  }
  return Object.getPrototypeOf(input) === proto;
};

// src/util/decode_protected_header.ts
function decodeProtectedHeader(token) {
  let protectedB64u;
  if (typeof token === "string") {
    const parts = token.split(".");
    if (parts.length === 3 || parts.length === 5) {
      ;
      [protectedB64u] = parts;
    }
  } else if (typeof token === "object" && token) {
    if ("protected" in token) {
      protectedB64u = token.protected;
    } else {
      throw new TypeError("Token does not contain a Protected Header");
    }
  }
  try {
    if (typeof protectedB64u !== "string" || !protectedB64u) {
      throw new Error();
    }
    const result = JSON.parse(decoder.decode(decode(protectedB64u)));
    if (!is_object_default(result)) {
      throw new Error();
    }
    return result;
  } catch {
    throw new TypeError("Invalid Token or Protected Header formatting");
  }
}
export {
  decodeProtectedHeader
};