navflow-proxy-server/src/utils.js

Dynamic WebSocket proxy server for NavFlow

/**
 * Utility functions for tunnel ID and password generation
 */

/**
 * Generate a random tunnel ID (8 characters, alphanumeric)
 * @returns {string} Tunnel ID like "a7b2c9d4"
 */
function generateTunnelId() {
  const chars = 'abcdefghijklmnopqrstuvwxyz0123456789';
  let result = '';
  for (let i = 0; i < 8; i++) {
    result += chars.charAt(Math.floor(Math.random() * chars.length));
  }
  return result;
}

/**
 * Generate a secure random password for tunnel authentication
 * @returns {string} Password like "pass123xyz"
 */
function generatePassword() {
  const chars = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789';
  let result = '';
  for (let i = 0; i < 12; i++) {
    result += chars.charAt(Math.floor(Math.random() * chars.length));
  }
  return result;
}

/**
 * Parse subdomain from hostname
 * @param {string} hostname - Full hostname like "a7b2c9d4.proxy.example.com"
 * @returns {string|null} Subdomain like "a7b2c9d4" or null if not found
 */
function parseSubdomain(hostname) {
  const parts = hostname.split('.');
  if (parts.length >= 3) {
    return parts[0];
  }
  return null;
}

/**
 * Validate tunnel ID format
 * @param {string} tunnelId 
 * @returns {boolean}
 */
function isValidTunnelId(tunnelId) {
  return /^[a-z0-9]{8}$/.test(tunnelId);
}

module.exports = {
  generateTunnelId,
  generatePassword,
  parseSubdomain,
  isValidTunnelId
};