@equicord/unzip-crx/dist/index.js

unzip chrome extension files (*.crx)

"use strict";Object.defineProperty(exports, "__esModule", {value: true}); function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }// src/index.ts
var _promises = require('fs/promises'); var _promises2 = _interopRequireDefault(_promises);
var _path = require('path'); var _path2 = _interopRequireDefault(_path);
var _jszip = require('jszip'); var _jszip2 = _interopRequireDefault(_jszip);
function mkdirp(path2) {
  return _promises2.default.mkdir(path2, { recursive: true });
}
function crxToZip(buf) {
  function calcLength(a, b, c, d) {
    let length = 0;
    length += a << 0;
    length += b << 8;
    length += c << 16;
    length += d << 24 >>> 0;
    return length;
  }
  if (buf[0] === 80 && buf[1] === 75 && buf[2] === 3 && buf[3] === 4) {
    return buf;
  }
  if (buf[0] !== 67 || buf[1] !== 114 || buf[2] !== 50 || buf[3] !== 52) {
    throw new Error("Invalid header: Does not start with Cr24");
  }
  const isV3 = buf[4] === 3;
  const isV2 = buf[4] === 2;
  if (!isV2 && !isV3 || buf[5] || buf[6] || buf[7]) {
    throw new Error("Unexpected crx format version number.");
  }
  if (isV2) {
    const publicKeyLength = calcLength(buf[8], buf[9], buf[10], buf[11]);
    const signatureLength = calcLength(buf[12], buf[13], buf[14], buf[15]);
    const zipStartOffset2 = 16 + publicKeyLength + signatureLength;
    return buf.slice(zipStartOffset2, buf.length);
  }
  const headerSize = calcLength(buf[8], buf[9], buf[10], buf[11]);
  const zipStartOffset = 12 + headerSize;
  return buf.slice(zipStartOffset, buf.length);
}
async function unzip(crxFilePath, destination) {
  const filePath = _path2.default.resolve(crxFilePath);
  let dest;
  if (destination) {
    dest = destination;
  } else {
    const extname = _path2.default.extname(crxFilePath);
    const basename = _path2.default.basename(crxFilePath, extname);
    const dirname = _path2.default.dirname(crxFilePath);
    dest = _path2.default.resolve(dirname, basename);
  }
  const buf = await _promises2.default.readFile(filePath);
  const { files } = await _jszip2.default.loadAsync(crxToZip(buf));
  return Promise.all(
    Object.keys(files).map(async (filename) => {
      const isFile = !files[filename].dir;
      const fullPath = _path2.default.join(dest, filename);
      const directory = isFile && _path2.default.dirname(fullPath) || fullPath;
      await mkdirp(directory);
      if (isFile) {
        const content = await files[filename].async("nodebuffer");
        await _promises2.default.writeFile(fullPath, content);
      }
    })
  );
}
var src_default = unzip;



exports.default = src_default; exports.unzip = unzip;