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Viewing file:     localstorage.js (5.21 KB)      -rw-r--r--

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.getLocalStorage = getLocalStorage;
exports.storageKey = storageKey;
exports.postMessage = postMessage;
exports.addStorageEventListener = addStorageEventListener;
exports.removeStorageEventListener = removeStorageEventListener;
exports.create = create;
exports.close = close;
exports.onMessage = onMessage;
exports.canBeUsed = canBeUsed;
exports.averageResponseTime = averageResponseTime;
exports["default"] = exports.type = exports.microSeconds = void 0;

var _obliviousSet = require("oblivious-set");

var _options = require("../options");

var _util = require("../util");

/**
 * A localStorage-only method which uses localstorage and its 'storage'-event
 * This does not work inside of webworkers because they have no access to locastorage
 * This is basically implemented to support IE9 or your grandmothers toaster.
 * @link https://caniuse.com/#feat=namevalue-storage
 * @link https://caniuse.com/#feat=indexeddb
 */
var microSeconds = _util.microSeconds;
exports.microSeconds = microSeconds;
var KEY_PREFIX = 'pubkey.broadcastChannel-';
var type = 'localstorage';
/**
 * copied from crosstab
 * @link https://github.com/tejacques/crosstab/blob/master/src/crosstab.js#L32
 */

exports.type = type;

function getLocalStorage() {
  var localStorage;
  if (typeof window === 'undefined') return null;

  try {
    localStorage = window.localStorage;
    localStorage = window['ie8-eventlistener/storage'] || window.localStorage;
  } catch (e) {// New versions of Firefox throw a Security exception
    // if cookies are disabled. See
    // https://bugzilla.mozilla.org/show_bug.cgi?id=1028153
  }

  return localStorage;
}

function storageKey(channelName) {
  return KEY_PREFIX + channelName;
}
/**
* writes the new message to the storage
* and fires the storage-event so other readers can find it
*/


function postMessage(channelState, messageJson) {
  return new Promise(function (res) {
    (0, _util.sleep)().then(function () {
      var key = storageKey(channelState.channelName);
      var writeObj = {
        token: (0, _util.randomToken)(),
        time: new Date().getTime(),
        data: messageJson,
        uuid: channelState.uuid
      };
      var value = JSON.stringify(writeObj);
      getLocalStorage().setItem(key, value);
      /**
       * StorageEvent does not fire the 'storage' event
       * in the window that changes the state of the local storage.
       * So we fire it manually
       */

      var ev = document.createEvent('Event');
      ev.initEvent('storage', true, true);
      ev.key = key;
      ev.newValue = value;
      window.dispatchEvent(ev);
      res();
    });
  });
}

function addStorageEventListener(channelName, fn) {
  var key = storageKey(channelName);

  var listener = function listener(ev) {
    if (ev.key === key) {
      fn(JSON.parse(ev.newValue));
    }
  };

  window.addEventListener('storage', listener);
  return listener;
}

function removeStorageEventListener(listener) {
  window.removeEventListener('storage', listener);
}

function create(channelName, options) {
  options = (0, _options.fillOptionsWithDefaults)(options);

  if (!canBeUsed()) {
    throw new Error('BroadcastChannel: localstorage cannot be used');
  }

  var uuid = (0, _util.randomToken)();
  /**
   * eMIs
   * contains all messages that have been emitted before
   * @type {ObliviousSet}
   */

  var eMIs = new _obliviousSet.ObliviousSet(options.localstorage.removeTimeout);
  var state = {
    channelName: channelName,
    uuid: uuid,
    eMIs: eMIs // emittedMessagesIds

  };
  state.listener = addStorageEventListener(channelName, function (msgObj) {
    if (!state.messagesCallback) return; // no listener

    if (msgObj.uuid === uuid) return; // own message

    if (!msgObj.token || eMIs.has(msgObj.token)) return; // already emitted

    if (msgObj.data.time && msgObj.data.time < state.messagesCallbackTime) return; // too old

    eMIs.add(msgObj.token);
    state.messagesCallback(msgObj.data);
  });
  return state;
}

function close(channelState) {
  removeStorageEventListener(channelState.listener);
}

function onMessage(channelState, fn, time) {
  channelState.messagesCallbackTime = time;
  channelState.messagesCallback = fn;
}

function canBeUsed() {
  if (_util.isNode) return false;
  var ls = getLocalStorage();
  if (!ls) return false;

  try {
    var key = '__broadcastchannel_check';
    ls.setItem(key, 'works');
    ls.removeItem(key);
  } catch (e) {
    // Safari 10 in private mode will not allow write access to local
    // storage and fail with a QuotaExceededError. See
    // https://developer.mozilla.org/en-US/docs/Web/API/Web_Storage_API#Private_Browsing_Incognito_modes
    return false;
  }

  return true;
}

function averageResponseTime() {
  var defaultTime = 120;
  var userAgent = navigator.userAgent.toLowerCase();

  if (userAgent.includes('safari') && !userAgent.includes('chrome')) {
    // safari is much slower so this time is higher
    return defaultTime * 2;
  }

  return defaultTime;
}

var _default = {
  create: create,
  close: close,
  onMessage: onMessage,
  postMessage: postMessage,
  canBeUsed: canBeUsed,
  type: type,
  averageResponseTime: averageResponseTime,
  microSeconds: microSeconds
};
exports["default"] = _default;