openpgp/src/config/localStorage.js

OpenPGP.js is a Javascript implementation of the OpenPGP protocol. This is defined in RFC 4880.

/**
 * @fileoverview Provides functions for storing and retrieving configuration from HTML5 local storage.
 * @module config/localStorage
 */

/**
 * This object is used for storing and retrieving configuration from HTML5 local storage.
 * @constructor
 */
function LocalStorage() {}

/**
 * Reads the config out of the HTML5 local storage
 * and initializes the object config.
 * if config is null the default config will be used
 */
LocalStorage.prototype.read = function () {
  const raw = window.localStorage.getItem("config");
  const cf = (raw === null ? null : JSON.parse(raw));
  if (cf === null) {
    this.config = this.default_config;
    this.write();
  } else {
    this.config = cf;
  }
};

/**
 * Writes the config to HTML5 local storage
 */
LocalStorage.prototype.write = function () {
  window.localStorage.setItem("config", JSON.stringify(this.config));
};

export default LocalStorage;