/* 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 = [];
    // Construct a jar URI from the file URI so we can use the JAR URI scheme
    // handling to navigate inside the zip file.
    let jarPath = "jar:" + msg.data.zipURI + "!/";
    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 });
      if (OS.Constants.Sys.Name == "Darwin") {
        // If we're on MacOS Firefox will add the quarantine xattr to files it
        // downloads. In this case we want to clear that xattr so we can load
        // the CDM.
        try {
          await OS.File.macRemoveXAttr(destPath, "com.apple.quarantine");
        } catch (e) {
          // Failed to remove the attribute. This could be because the profile
          // exists on a file system without xattr support.
          //
          // Don't fail the extraction here, as in this case it's likely we
          // didn't set quarantine on these files in the first place.
        }
      }
      extractedPaths.push(destPath);
    }
    postMessage({
      result: "success",
      extractedPaths,
    });
  } catch (e) {
    postMessage({
      result: "fail",
      exception: e.message,
    });
  }
};