`server.js`

45 lines
#!/usr/bin/env node
// Credential Launcher — tiny static server, localhost only, kept alive by launchd.
// Serves page.html (authored for the Artifact skeleton) wrapped in a standalone
// HTML document so it renders in a normal browser at http://127.0.0.1:51858/.
const http = require('http');
const fs = require('fs');
const path = require('path');

const PORT = Number(process.env.PORT) || 51858;
const HOST = '127.0.0.1';
const PAGE = path.join(__dirname, 'page.html');

const HEAD = '<!doctype html><html lang="en"><head>' +
  '<meta charset="utf-8">' +
  '<meta name="viewport" content="width=device-width, initial-scale=1, viewport-fit=cover">' +
  '<style>html,body{margin:0}img{max-width:100%}[hidden]{display:none!important}</style>';

function render() {
  // Read fresh each request so editing page.html shows up on reload.
  const body = fs.readFileSync(PAGE, 'utf8');
  return HEAD + body + '</html>';
}

const server = http.createServer((req, res) => {
  if (req.url === '/health') {
    res.writeHead(200, { 'content-type': 'text/plain' });
    return res.end('ok');
  }
  try {
    const html = render();
    res.writeHead(200, { 'content-type': 'text/html; charset=utf-8', 'cache-control': 'no-store' });
    res.end(html);
  } catch (e) {
    res.writeHead(500, { 'content-type': 'text/plain' });
    res.end('cred-launcher error: ' + e.message);
  }
});

server.listen(PORT, HOST, () => {
  console.log(`[${new Date().toISOString()}] cred-launcher listening on http://${HOST}:${PORT}/`);
});

// Fail loud but let launchd KeepAlive restart us.
process.on('uncaughtException', (e) => { console.error('uncaught', e); process.exit(1); });