WebExtensions (web-ext) update manifest for self-hosted updates

update-dist.js

/**
 * Create updates.json for offline automatic updates
 * https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/Updates
 *
 * Usage:
 * node update-dist.js [path to .xpi files] [path to update.json] [url prefix to .xpi files]
 *
 * Author:
 * marko@zabreznik.net
 */

const path = require("path");
const fs = require("fs");
const crypto = require("crypto");
const StreamZip = require("node-stream-zip");

const [_0, _1, _distPath, _updatePath, _distUrlPrefix] = process.argv;

async function getManifest(file) {
  return await new Promise(resolve => {
    const zip = new StreamZip({ file });
    zip.on("ready", () => {
      const data = zip.entryDataSync("manifest.json");
      let manifest = JSON.parse(data.toString());
      zip.close();
      resolve(manifest);
    });
  });
}

async function updateUpdate(distPath, updatePath) {
  let updateConfig = require(updatePath);

  const files = fs.readdirSync(distPath).filter(x => x.endsWith(".xpi"));

  for (const file of files) {
    const filePath = path.join(distPath, file);
    const manifest = await getManifest(filePath);

    const applicationId = manifest.applications.gecko.id;
    const version = manifest.version;

    if (applicationId in updateConfig.addons) {
      if (
        updateConfig.addons[applicationId]["updates"].filter(
          x => version === x.version
        ).length < 1
      ) {
        // compute hash
        const updateHash = await new Promise((resolve, reject) => {
          let hash = crypto.createHash("sha512");
          let stream = fs.createReadStream(filePath);
          stream.on('error', err => reject(err));
          stream.on('data', chunk => hash.update(chunk));
          stream.on('end', () => resolve(hash.digest('hex')));
        });

        updateConfig.addons[applicationId]["updates"].push({
          version: version,
          update_link: _distUrlPrefix + file,
          applications: manifest.applications,
          update_hash: "sha512:" + updateHash
        });
        console.log(`added version ${applicationId}:${version}`);
      }
    } else {
      console.log(`${applicationId} not in ${updatePath}`);
    }
  }

  fs.writeFileSync(updatePath, JSON.stringify(updateConfig, null, "\t"));
}

updateUpdate(path.resolve(_distPath), path.resolve(_updatePath));