@paralleldrive/feature-toggles/dist/create-express-middleware.js

Low-level feature toggle tools for Node and browsers.

'use strict';

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.createExpressMiddleware = undefined;

var _curry = require('ramda/src/curry');

var _curry2 = _interopRequireDefault(_curry);

var _url = require('url');

var _isActiveFeatureName = require('./is-active-feature-name');

var _mergeFeatureNames = require('./merge-feature-names');

var _getQueryFeatureNames = require('./get-query-feature-names');

function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }

var setStatus = function setStatus(res, isActiveFeatureName) {
  return isActiveFeatureName ? res.status(200) : res.status(404);
};

// ({ features: [...String] }, requiredFeature: String, methods?: Object) => (req, res, next) => void
var createExpressMiddleware = exports.createExpressMiddleware = (0, _curry2.default)(function (_ref, requiredFeature, methods) {
  var features = _ref.features;
  return function (req, res, next) {
    var parsedUrl = (0, _url.parse)(req.url, true);
    var query = parsedUrl.query;

    var updatedFeatures = (0, _mergeFeatureNames.mergeFeatureNames)(features, (0, _getQueryFeatureNames.getQueryFeatureNames)(query));
    setStatus(res, (0, _isActiveFeatureName.isActiveFeatureName)(requiredFeature, updatedFeatures));

    var handler = methods[req.method.toLowerCase()];
    if (handler !== undefined && typeof handler === 'function') {
      return handler(req, res);
    }

    next();
  };
});