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handler-generator-example.js

 /**
 * @description Function to generate handler for lambda
 * @returns {function(*)}
 */
toLambda() {
  return async event => {
    // FUNCTIONS HELPERS
    /**
     * @description Get a flat array
     * @param arr Array to flat
     * @private
     */
    const _toFlat = arr => [].concat(...arr);

    // PARAMS
    const { resource, path, httpMethod: method, queryStringParameters, body } = event;
    const [ awsPath ] = resource.split('/{proxy*}');
    const [, routerPath] = path.split(awsPath);
    const findPredicate = this._findAndComposeRoute(method.toLowerCase(), routerPath);
    const routesFound = this._routes.filter(findPredicate);

    // ROUTES FOUND VALIDATION
    if ((routesFound.length === 0) || (routesFound.length === 1 && routesFound[0].method === "*")) {
      return resHandler(404, { message: "Oops route not found on router" });
    }

    // GET MIDDLEWARES FUNCTIONS
    const functions = routesFound.map(i => ([...i.middlewares]));
    const lastRoute = [...routesFound].pop();
    const pathParams = lastRoute.params;
    const fns = _toFlat(functions);

    // ADD PARAMS AND BODY TO NATIVE EVENT
    event.params = pathParams;
    event.query = queryStringParameters || {};
    event.body = body && method.toLowerCase() !== "get" ? body : {};

    return Pipeline.create(fns)(event);
  };
}