yoanm / async-response-aggregator-server

"use strict";

const requestPromise = require('request-promise-native');

const pkg = require('../../package.json');

const logger = require('../logger/taskLogger')('Client');

const Response = require('../model/Response');

const defaultOptionList = {

    headers: {'User-Agent': pkg.name},

    json: true,

    simple: false,

    resolveWithFullResponse: true

};

/**

 * @param {Request} request

 *

 * @returns {Promise<Response|Error>}

 */

module.exports = (request) => {

    const optionList = Object.assign(

        {},

        defaultOptionList,

        {

            uri: request.getUri(),

            method: request.getMethod(),

            headers: Object.assign({}, defaultOptionList.headers, request.getHeaders()),

            json: request.isJson()

        }

    );

    if (request.getForm() && Object.keys(request.getForm()).length > 0) {

        optionList.form = request.getForm();

    }

    if (request.getPayload() && Object.keys(request.getPayload()).length > 0) {

        optionList.body = request.getPayload();

    } else {

        optionList.body = optionList.json === true ? {} : '';

    }

    if (request.getQueryString() && Object.keys(request.getQueryString()).length > 0) {

        optionList.qs = request.getQueryString();

    } else {

        optionList.qs = optionList.json === true ? {} : null;

    }

    const transformResponseToResponseObject = response => {

        return new Response(

            response.body,

            response.statusCode,

            response.headers,

            request

        );

    };

    const transformErrorToResponseObject = error => {

        logger.debug('[Error] Conversion to Response.', {options: optionList});

        return Promise.resolve(new Response(

            optionList.json === true ? {

                error: error.error.code,

                message: error.message

            } : `${error.error.code} ${error.message}`,

            500,

            {},

            request

        ));

    };

    const logResponseObject = response => {

        logger.debug('[Reponse]', {response: response, options: optionList});

        return response;

    };

    logger.debug('[Request]', {options: optionList});

    const transform = requestPromise(optionList)

        .then(transformResponseToResponseObject, transformErrorToResponseObject);

    return transform

        .then(logResponseObject);

};