patch-nwjs-codecs.mjs

import child_process from "child_process";
import fs from "fs";
import got from "got";
import os from "os";
import path from "path";
import stream from "stream";
import {promisify} from "util";

const ignore = () => undefined;

// IMPORTANT: Take a look at https://www.ffmpeg.org/legal.html.

/** @param {string} nw_path */
export async function patch_nwjs_codecs(nw_path) {
  const { dependencies, devDependencies } = JSON.parse(String(
    await fs.promises.readFile(path.join(process.cwd(), "package.json"))));

  const nw      = dependencies?.nw || devDependencies?.nw;
  const version = nw.replace("-sdk", "");

  const url = String(child_process.execSync(
    `npx -y nwjs-ffmpeg-prebuilt -v ${version} --get-download-url`));

  const     temp_folder
    = await fs.promises.mkdtemp(path.join(os.tmpdir(), "nwjs-ffmpeg-"));

  const ffmpeg_zip = path.join(temp_folder, "ffmpeg.zip");
  await promisify(stream.pipeline)(got.stream(url),
                                   fs.createWriteStream(ffmpeg_zip));

  switch (os.platform()) {
  case "darwin":
    nw_path
      = nw_path.replace("MacOS/nwjs",
                        "Frameworks/nwjs Framework.framework/Versions/Current");
    break;
  case "win32": nw_path = nw_path.replace("nw.exe", ""); break;
  case "linux": nw_path = nw_path.replace("nw/nwjs/nw", "nw/nwjs/lib"); break;
  }

  child_process.execSync(os.platform() === "win32"
                           ? `powershell Expand-Archive ${
                             ffmpeg_zip} -DestinationPath ${nw_path} -Force`
                           : `unzip -o ${JSON.stringify(ffmpeg_zip)} -d ${
                             JSON.stringify(nw_path)}`,
                         { stdio: "inherit" });

  await fs.promises.unlink(temp_folder).catch(ignore);
}