indexed-db.js

/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

"use strict";

/**
 * This indexedDB helper is a simplified version of sdk/indexed-db. It creates a DB with
 * a principal dedicated to DevTools.
 */

const PSEUDOURI = "indexeddb://fx-devtools";
const principaluri = Services.io.newURI(PSEUDOURI);
const principal = Services.scriptSecurityManager.createContentPrincipal(
  principaluri,
  {}
);

// indexedDB is only exposed to document globals.
// We are retrieving an instance from a Sandbox, which has to be loaded
// from the system principal in order to avoid having wrappers around
// all indexed DB objects.
const systemPrincipal = Services.scriptSecurityManager.getSystemPrincipal();
const sandbox = Cu.Sandbox(systemPrincipal, {
  wantGlobalProperties: ["indexedDB"],
});
const { indexedDB } = sandbox;

module.exports = Object.freeze({
  /**
   * Only the standard version of indexedDB.open is supported.
   */
  open(name, version) {
    const options = {};
    if (typeof version === "number") {
      options.version = version;
    }
    return indexedDB.openForPrincipal(principal, name, options);
  },

  /**
   * Only the standard version of indexedDB.deleteDatabase is supported.
   */
  deleteDatabase(name) {
    return indexedDB.deleteForPrincipal(principal, name);
  },

  cmp: indexedDB.cmp.bind(indexedDB),
});