jose/dist/webapi/lib/deflate.js

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

import { JOSENotSupported, JWEInvalid } from "../util/errors.js";
import { concat } from "./buffer_utils.js";
function validateZip(joseHeader, protectedHeader) {
  if (joseHeader.zip !== void 0 && joseHeader.zip !== "DEF")
    throw new JOSENotSupported('Unsupported JWE "zip" (Compression Algorithm) Header Parameter value.');
  if (joseHeader.zip !== void 0 && !protectedHeader?.zip)
    throw new JWEInvalid('JWE "zip" (Compression Algorithm) Header Parameter MUST be in a protected header.');
}
function supported(name) {
  if (typeof globalThis[name] > "u")
    throw new JOSENotSupported(`JWE "zip" (Compression Algorithm) Header Parameter requires the ${name} API.`);
}
async function transform(stream, input, maxLength = 1 / 0) {
  const writer = stream.writable.getWriter();
  writer.write(input).catch(() => {
  }), writer.close().catch(() => {
  });
  const chunks = [];
  let length = 0;
  const reader = stream.readable.getReader();
  for (; ; ) {
    const { value, done } = await reader.read();
    if (done)
      break;
    if (chunks.push(value), length += value.byteLength, maxLength !== 1 / 0 && length > maxLength)
      throw new JWEInvalid("Decompressed plaintext exceeded the configured limit");
  }
  return concat(...chunks);
}
async function compress(input) {
  return supported("CompressionStream"), transform(new CompressionStream("deflate-raw"), input);
}
async function decompress(input, maxLength) {
  return supported("DecompressionStream"), transform(new DecompressionStream("deflate-raw"), input, maxLength);
}
export {
  compress,
  decompress,
  validateZip
};