i18next-express-middleware/lib/LanguageDetector.js

express middleware for i18next

'use strict';

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

var _createClass = function () { function defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } } return function (Constructor, protoProps, staticProps) { if (protoProps) defineProperties(Constructor.prototype, protoProps); if (staticProps) defineProperties(Constructor, staticProps); return Constructor; }; }();

var _utils = require('./utils');

var utils = _interopRequireWildcard(_utils);

var _cookie = require('./languageLookups/cookie');

var _cookie2 = _interopRequireDefault(_cookie);

var _querystring = require('./languageLookups/querystring');

var _querystring2 = _interopRequireDefault(_querystring);

var _path = require('./languageLookups/path');

var _path2 = _interopRequireDefault(_path);

var _header = require('./languageLookups/header');

var _header2 = _interopRequireDefault(_header);

var _session = require('./languageLookups/session');

var _session2 = _interopRequireDefault(_session);

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

function _interopRequireWildcard(obj) { if (obj && obj.__esModule) { return obj; } else { var newObj = {}; if (obj != null) { for (var key in obj) { if (Object.prototype.hasOwnProperty.call(obj, key)) newObj[key] = obj[key]; } } newObj.default = obj; return newObj; } }

function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }

function getDefaults() {
  return {
    order: [/*'path', 'session' */'querystring', 'cookie', 'header'],
    lookupQuerystring: 'lng',
    lookupCookie: 'i18next',
    lookupSession: 'lng',
    lookupFromPathIndex: 0,

    // cache user language
    caches: false // ['cookie']
    //cookieExpirationDate: new Date(),
    //cookieDomain: 'myDomain'
  };
}

var LanguageDetector = function () {
  function LanguageDetector(services) {
    var options = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : {};
    var allOptions = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : {};

    _classCallCheck(this, LanguageDetector);

    this.type = 'languageDetector';
    this.detectors = {};

    this.init(services, options, allOptions);
  }

  _createClass(LanguageDetector, [{
    key: 'init',
    value: function init(services) {
      var options = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : {};
      var allOptions = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : {};

      this.services = services;
      this.options = utils.defaults(options, this.options || {}, getDefaults());
      this.allOptions = allOptions;

      this.addDetector(_cookie2.default);
      this.addDetector(_querystring2.default);
      this.addDetector(_path2.default);
      this.addDetector(_header2.default);
      this.addDetector(_session2.default);
    }
  }, {
    key: 'addDetector',
    value: function addDetector(detector) {
      this.detectors[detector.name] = detector;
    }
  }, {
    key: 'detect',
    value: function detect(req, res, detectionOrder) {
      var _this = this;

      if (arguments.length < 2) return;
      if (!detectionOrder) detectionOrder = this.options.order;

      var found = void 0;
      detectionOrder.forEach(function (detectorName) {
        if (found || !_this.detectors[detectorName]) return;

        var detections = _this.detectors[detectorName].lookup(req, res, _this.options);
        if (!detections) return;
        if (!Array.isArray(detections)) detections = [detections];

        detections.forEach(function (lng) {
          if (found || typeof lng !== 'string') return;

          var cleanedLng = _this.services.languageUtils.formatLanguageCode(lng);

          if (_this.services.languageUtils.isWhitelisted(cleanedLng)) {
            found = cleanedLng;
            req.i18nextLookupName = detectorName;
          };
        });
      });

      if (!found) {
        var fallbacks = this.allOptions.fallbackLng;
        if (typeof fallbacks === 'string') fallbacks = [fallbacks];
        if (!fallbacks) fallbacks = [];

        if (Object.prototype.toString.apply(fallbacks) === '[object Array]') {
          found = fallbacks[0];
        } else {
          found = fallbacks[0] || fallbacks.default && fallbacks.default[0];
        }
      };

      return found;
    }
  }, {
    key: 'cacheUserLanguage',
    value: function cacheUserLanguage(req, res, lng, caches) {
      var _this2 = this;

      if (arguments.length < 3) return;
      if (!caches) caches = this.options.caches;
      if (!caches) return;
      caches.forEach(function (cacheName) {
        if (_this2.detectors[cacheName] && _this2.detectors[cacheName].cacheUserLanguage) _this2.detectors[cacheName].cacheUserLanguage(req, res, lng, _this2.options);
      });
    }
  }]);

  return LanguageDetector;
}();

LanguageDetector.type = 'languageDetector';

exports.default = LanguageDetector;