install.js

#!/usr/bin/env node
'use strict';

const fs   = require('fs');
const path = require('path');
const os   = require('os');
const zlib = require('zlib');
const { execSync } = require('child_process');

const ROOT = __dirname;

// ── Generate placeholder icons ─────────────────────────────────────────────────

function crc32(buf) {
  const table = new Uint32Array(256);
  for (let i = 0; i < 256; i++) {
    let c = i;
    for (let j = 0; j < 8; j++) c = (c & 1) ? 0xEDB88320 ^ (c >>> 1) : c >>> 1;
    table[i] = c;
  }
  let crc = 0xFFFFFFFF;
  for (let i = 0; i < buf.length; i++) crc = table[(crc ^ buf[i]) & 0xFF] ^ (crc >>> 8);
  return (crc ^ 0xFFFFFFFF) >>> 0;
}

function pngChunk(type, data) {
  const t = Buffer.from(type);
  const len = Buffer.allocUnsafe(4);
  len.writeUInt32BE(data.length, 0);
  const crc = Buffer.allocUnsafe(4);
  crc.writeUInt32BE(crc32(Buffer.concat([t, data])), 0);
  return Buffer.concat([len, t, data, crc]);
}

function makePNG(size, r, g, b) {
  const sig = Buffer.from([0x89, 0x50, 0x4E, 0x47, 0x0D, 0x0A, 0x1A, 0x0A]);

  const ihdr = Buffer.alloc(13);
  ihdr.writeUInt32BE(size, 0);
  ihdr.writeUInt32BE(size, 4);
  ihdr[8] = 8; ihdr[9] = 2; // 8-bit RGB

  const rowLen = 1 + size * 3;
  const raw = Buffer.alloc(size * rowLen);
  for (let y = 0; y < size; y++) {
    raw[y * rowLen] = 0; // filter type None
    for (let x = 0; x < size; x++) {
      const i = y * rowLen + 1 + x * 3;
      raw[i] = r; raw[i + 1] = g; raw[i + 2] = b;
    }
  }

  return Buffer.concat([
    sig,
    pngChunk('IHDR', ihdr),
    pngChunk('IDAT', zlib.deflateSync(raw)),
    pngChunk('IEND', Buffer.alloc(0)),
  ]);
}

const iconsDir = path.join(ROOT, 'extension', 'icons');
for (const size of [16, 48, 128]) {
  const iconPath = path.join(iconsDir, `icon${size}.png`);
  if (!fs.existsSync(iconPath)) {
    // Krunker orange (#F29F00)
    fs.writeFileSync(iconPath, makePNG(size, 0xF2, 0x9F, 0x00));
    console.log(`  Created icon${size}.png`);
  }
}

// ── npm install for native host ────────────────────────────────────────────────

const hostDir = path.join(ROOT, 'native-host');
if (!fs.existsSync(path.join(hostDir, 'node_modules'))) {
  console.log('Installing native host dependencies…');
  execSync('pnpm install', { cwd: hostDir, stdio: 'inherit' });
}

fs.chmodSync(path.join(hostDir, 'host.js'), 0o755);

// ── Args ───────────────────────────────────────────────────────────────────────

const extensionId = process.argv[2];
if (!extensionId || !/^[a-z]{32}$/.test(extensionId)) {
  console.error('\nUsage: node install.js <chrome-extension-id>');
  console.error('  Load the extension in Chrome first, then copy the 32-letter ID from chrome://extensions');
  process.exit(1);
}

// ── Write wrapper shell script (Chrome has a minimal PATH; node won't be found
//    via /usr/bin/env on macOS Homebrew installs without this) ─────────────────

// Use `which node` to get the stable symlink path (e.g. /opt/homebrew/bin/node)
// rather than process.execPath which may point to a versioned Cellar path that
// breaks after `brew upgrade node`.
const nodeBin = execSync('which node', { encoding: 'utf8' }).trim();
const runScript = path.join(hostDir, 'run.sh');
fs.writeFileSync(
  runScript,
  `#!/bin/sh\nexec "${nodeBin}" "${path.join(hostDir, 'host.js')}"\n`,
);
fs.chmodSync(runScript, 0o755);

// ── Write native messaging host manifest ───────────────────────────────────────

const hostManifest = {
  name: 'com.krunker.discord_rpc',
  description: 'Discord Rich Presence for Krunker.io',
  path: runScript,
  type: 'stdio',
  allowed_origins: [`chrome-extension://${extensionId}/`],
};

// Helium (net.imput.helium) is the target browser
const nativeMsgDir = path.join(
  os.homedir(),
  'Library', 'Application Support', 'net.imput.helium', 'NativeMessagingHosts',
);
fs.mkdirSync(nativeMsgDir, { recursive: true });
const manifestPath = path.join(nativeMsgDir, 'com.krunker.discord_rpc.json');
fs.writeFileSync(manifestPath, JSON.stringify(hostManifest, null, 2));

console.log('\nInstalled successfully!');
console.log(`  Native host manifest → ${manifestPath}`);
console.log('\nNext steps:');
console.log('  1. Reload the extension on helium://extensions');
console.log('  2. Open krunker.io and join a game');
console.log('  3. Discord should show your presence within a few seconds');