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Viewing file:     Storage-impl.js (2.6 KB)      -rw-r--r--

"use strict";

const DOMException = require("domexception/webidl2js-wrapper");
const StorageEvent = require("../generated/StorageEvent");
const idlUtils = require("../generated/utils");
const { fireAnEvent } = require("../helpers/events");

// https://html.spec.whatwg.org/multipage/webstorage.html#the-storage-interface
class StorageImpl {
  constructor(globalObject, args, privateData) {
    const { associatedWindow, storageArea, url, type, storageQuota } = privateData;

    this._associatedWindow = associatedWindow;
    this._items = storageArea;
    this._url = url;
    this._type = type;
    this._quota = storageQuota;

    this._globalObject = globalObject;
  }

  _dispatchStorageEvent(key, oldValue, newValue) {
    return this._associatedWindow._currentOriginData.windowsInSameOrigin
      .filter(target => target !== this._associatedWindow)
      .forEach(target => fireAnEvent("storage", target, StorageEvent, {
        key,
        oldValue,
        newValue,
        url: this._url,
        storageArea: target["_" + this._type]
      }));
  }

  get length() {
    return this._items.size;
  }

  key(n) {
    if (n >= this._items.size) {
      return null;
    }
    return [...this._items.keys()][n];
  }

  getItem(key) {
    if (this._items.has(key)) {
      return this._items.get(key);
    }
    return null;
  }

  setItem(key, value) {
    const oldValue = this._items.get(key) || null;

    if (oldValue === value) {
      return;
    }

    // Concatenate all keys and values to measure their length against the quota
    let itemsTotalLength = key.length + value.length;
    for (const [curKey, curValue] of this._items) {
      // If the key already exists, skip it as it will be set to the new value instead
      if (key !== curKey) {
        itemsTotalLength += curKey.length + curValue.length;
      }
    }
    if (itemsTotalLength > this._quota) {
      throw DOMException.create(this._globalObject, [
        `The ${this._quota}-code unit storage quota has been exceeded.`,
        "QuotaExceededError"
      ]);
    }

    setTimeout(this._dispatchStorageEvent.bind(this), 0, key, oldValue, value);

    this._items.set(key, value);
  }

  removeItem(key) {
    if (this._items.has(key)) {
      setTimeout(this._dispatchStorageEvent.bind(this), 0, key, this._items.get(key), null);

      this._items.delete(key);
    }
  }

  clear() {
    if (this._items.size > 0) {
      setTimeout(this._dispatchStorageEvent.bind(this), 0, null, null, null);

      this._items.clear();
    }
  }

  get [idlUtils.supportedPropertyNames]() {
    return this._items.keys();
  }
}

module.exports = {
  implementation: StorageImpl
};