jormaechea/open-api-mocker

'use strict';
 
/* istanbul ignore file */
 
const parsePreferHeader = require('parse-prefer-header');
const memoize = require('micro-memoize');
const logger = require('lllog')();
const colors = require('colors');
 
// Create a function that is memoized using the URL, query, the Prefer header and the body.
// eslint-disable-next-line no-unused-vars
const getResponse = (path, url, query, preferHeader, body) => {
    const { example: preferredExampleName, statuscode: preferredStatusCode } = parsePreferHeader(preferHeader) || {};
 
    if(preferredStatusCode)
        logger.debug(`Searching requested response with status code ${preferredStatusCode}`);
    else
        logger.debug('Searching first response');
    return path.getResponse(preferredStatusCode, preferredExampleName);
};
 
const getResponseMemo = memoize(getResponse, {
    maxSize: 10
});
 
const checkContentType = req => {
    const contentType = req.header('content-type');
    if(!contentType)
        logger.warn(`${colors.yellow('*')} Missing content-type header`);
};
 
const handleRequest = (path, responseHandler) => (req, res) => {
 
    checkContentType(req);
 
    const {
        query,
        params,
        headers,
        cookies,
        body: requestBody
    } = req;
 
    const failedValidations = path.validateRequestParameters({
        query,
        path: params,
        headers,
        cookies,
        requestBody
    });
 
    if(failedValidations.length)
        return responseHandler(req, res, { errors: failedValidations }, 400);
 
    const preferHeader = req.header('prefer') || '';
 
    const { statusCode, headers: responseHeaders, body, responseMimeType } =
            getResponseMemo(path, req.path, JSON.stringify(req.query), preferHeader, JSON.stringify(requestBody));
 
    return responseHandler(req, res, body, statusCode, responseHeaders, responseMimeType);
};
 
module.exports = handleRequest;