reqweb/src/utils/configLoader.js

A powerful Web Application Firewall (WAF) for Node.js.

const fs = require('fs');
const path = require('path');

// Default configuration path
const userConfigPath = path.join(__dirname, '../config/userConfig.json');

/**
 * Loads the configuration file and merges it with default settings.
 * @returns {Object} Merged configuration object.
 */
function loadConfig() {
  let config;

  try {
    // Attempt to read the config file
    const rawConfig = fs.readFileSync(userConfigPath);
    const userConfig = JSON.parse(rawConfig);

    // Merge user config with default values
    config = mergeConfigs(getDefaultConfig(), userConfig);

    console.log("Configuration loaded successfully.");
  } catch (error) {
    console.error("Error loading config:", error.message);
    console.log("Loading default configuration.");

    // Use default config if file is missing or invalid
    config = getDefaultConfig();
  }

  console.log(`LOADED CONFIGS: ${JSON.stringify(config)}`)
  return config;
}

/**
 * Returns the default configuration object.
 * @returns {Object} Default configuration.
 */
function getDefaultConfig() {

  const defaultConfigPath = path.join(__dirname, '../config/defaultConfig.json');
  // Attempt to read the config file
  const rawConfig = fs.readFileSync(defaultConfigPath);
  const defaultConfig = JSON.parse(rawConfig);
  
  return defaultConfig;
}

/**
 * Merges the user configuration with the default configuration.
 * @param {Object} defaultConfig - Default configuration.
 * @param {Object} userConfig - User-provided configuration.
 * @returns {Object} Merged configuration.
 */
function mergeConfigs(defaultConfig, userConfig) {
  return {
    ipFiltering: {
      ...defaultConfig.ipFiltering,
      ...userConfig.ipFiltering
    },
    rateLimiting: {
      ...defaultConfig.rateLimiting,
      ...userConfig.rateLimiting
    },
    requestBlocking: {
      ...defaultConfig.requestBlocking,
      ...userConfig.requestBlocking
    },
    logging: {
      ...defaultConfig.logging,
      ...userConfig.logging
    },
    alerting: {
      ...defaultConfig.alerting,
      ...userConfig.alerting
    },
    general: {
      ...defaultConfig.general,
      ...userConfig.general
    }
  };
}

// Load and export the configuration
module.exports = loadConfig;