Function extractIPFromRequest

lib/parseRequest.js:40–77

(request)

// https://github.com/filipedeschamps/tabnews.com.br/blob/53482fa8d15c273e9dcda80242eaba4d9f37c9a9/models/ip.js#L4
export function extractIPFromRequest(request) {
  if (isRequestFromCloudflare(request)) {
    // Vercel via Cloudflare
    return request instanceof Request
      ? request.headers.get('cf-connecting-ip') // edge runtime
      : request.headers['cf-connecting-ip']; // node runtime
  }
  let realIp;

  if (request instanceof Request) {
    // edge runtime
    realIp = isServerlessRuntime
      ? request.headers.get('x-vercel-proxied-for')?.split(', ').at(-1) // Vercel
      : request.headers.get('x-forwarded-for')?.split(', ').at(-1); // remote development
  } else {
    // node runtime
    realIp = isServerlessRuntime
      ? request.headers['x-vercel-proxied-for']?.split(', ').at(-1) // Vercel
      : request.headers['x-forwarded-for']?.split(', ').at(-1); // remote development
  }

  if (!realIp) {
    // local development
    realIp = request.socket?.remoteAddress || '127.0.0.1';

    // Localhost loopback in IPv6
    if (realIp === '::1') {
      realIp = '127.0.0.1';
    }

    // IPv4-mapped IPv6 addresses
    if (realIp.substr(0, 7) === '::ffff:') {
      realIp = realIp.substr(7);
    }
  }

  return realIp;
}