GMPExtractorWorker.js

/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

/* eslint-env mozilla/chrome-worker */

"use strict";

importScripts("resource://gre/modules/osfile.jsm");

const FILE_ENTRY = "201: ";

onmessage = async function(msg) {
  try {
    let extractedPaths = [];
    let jarPath = "jar:file://" + msg.data.zipPath + "!/";
    let jarResponse = await fetch(jarPath);
    let dirListing = await jarResponse.text();
    let lines = dirListing.split("\n");
    let reader = new FileReader();
    for (let line of lines) {
      if (!line.startsWith(FILE_ENTRY)) {
        // Not a file entry, skip.
        continue;
      }
      let lineSplits = line.split(" ");
      let fileName = lineSplits[1];
      // We don't need these types of files.
      if (fileName == "verified_contents.json" ||
          fileName == "icon-128x128.png") {
        continue;
      }
      let filePath = jarPath + fileName;
      let filePathResponse = await fetch(filePath);
      let fileContents = await filePathResponse.blob();
      let fileData = await new Promise(resolve => {
        reader.onloadend = function() { resolve(reader.result); };
        reader.readAsArrayBuffer(fileContents);
      });
      let profileDirPath = OS.Constants.Path.profileDir;
      let installToDirPath = OS.Path.join(profileDirPath,
                                          msg.data.relativeInstallPath);
      await OS.File.makeDir(installToDirPath, {ignoreExisting: true,
                                               unixMode: 0o755,
                                               from: profileDirPath});
      // Do not extract into directories. Extract all files to the same
      // directory.
      let destPath = OS.Path.join(installToDirPath, fileName);
      await OS.File.writeAtomic(destPath, new Uint8Array(fileData),
                                {tmpPath: destPath + ".tmp"});
      // Ensure files are writable and executable. Otherwise, we may be
      // unable to execute or uninstall them.
      await OS.File.setPermissions(destPath, {unixMode: 0o700});
      extractedPaths.push(destPath);
    }
    postMessage({
      "result": "success",
      extractedPaths,
    });
  } catch (e) {
    postMessage({
      "result": "fail",
      "exception": e.message,
    });
  }
};