manifest-generator.js

// copied from https://github.com/SaltyMonkey/fps-manager
'use strict';
const crypto = require('crypto');
const fs = require('fs');
const path = require('path');

const IGNORED_FILES = ['manifest.json', 'manifest-generator.js', 'manifest-generator.bat', 'manifest-generator.exe', 'node.exe', 'package-lock.json'];
const IGNORED_START_SYMBOL = ['.', '_'];
const IGNORED_DIRS = [path.join(__dirname, 'node_modules')];

// load predefined manifest
let manifest;
try {
  manifest = require('./manifest.json');
  if (manifest && typeof manifest === 'object') {
    if (!manifest.files) manifest.files = {};
  } else manifest = { files: {} };
} catch (err) { manifest = { files: {} }; }

// cleanup manifest
Object.keys(manifest.files).forEach(entry => {
  try { fs.accessSync(path.join(__dirname, entry), fs.constants.F_OK); } catch (err) { delete manifest.files[entry]; }
});

// recursive file gather
function findInDirRelative(dir, fileList = []) {
  if (IGNORED_DIRS.includes(dir)) return fileList;

  const files = fs.readdirSync(dir);
  files.forEach((file) => {
    const filePath = path.join(dir, file);
    const fileStat = fs.lstatSync(filePath);
    if (!IGNORED_FILES.includes(file) && !IGNORED_START_SYMBOL.includes(file[0])) {
      if (fileStat.isDirectory()) findInDirRelative(filePath, fileList);
      else fileList.push(path.relative(__dirname, filePath));
    }
  });

  return fileList;
}

// generate hash
const files = findInDirRelative(__dirname);
files.forEach(filePath => {
  const file = filePath.replace(/\\/g, '/');
  if (manifest.files[file] && typeof manifest.files[file] === 'object') {
    manifest.files[file].hash = crypto.createHash('sha256').update(fs.readFileSync(path.join(__dirname, file))).digest('hex');
  } else { manifest.files[file] = crypto.createHash('sha256').update(fs.readFileSync(path.join(__dirname, file))).digest('hex'); }
});

// save file and add an empty line at the end
fs.writeFileSync(path.join(__dirname, 'manifest.json'), JSON.stringify(manifest, null, '  ') + '\n', 'utf8');