133 lines
3.9 KiB
JavaScript
133 lines
3.9 KiB
JavaScript
// GPG4Browsers - An OpenPGP implementation in javascript
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// Copyright (C) 2011 Recurity Labs GmbH
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//
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// This library is free software; you can redistribute it and/or
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// modify it under the terms of the GNU Lesser General Public
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// License as published by the Free Software Foundation; either
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// version 3.0 of the License, or (at your option) any later version.
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//
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public
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// License along with this library; if not, write to the Free Software
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// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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/* eslint-disable no-restricted-globals */
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/* eslint-disable no-var */
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/* eslint-disable vars-on-top */
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/**
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* @fileoverview Provides functions for communicating with workers
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* @see module:openpgp.initWorker
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* @see module:openpgp.getWorker
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* @see module:openpgp.destroyWorker
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* @see module:worker/async_proxy
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* @module worker/worker
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*/
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self.window = self; // to make UMD bundles work
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importScripts('openpgp.js');
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var openpgp = window.openpgp;
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var randomQueue = [];
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var MAX_SIZE_RANDOM_BUFFER = 60000;
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/**
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* Handle random buffer exhaustion by requesting more random bytes from the main window
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* @returns {Promise<Object>} Empty promise whose resolution indicates that the buffer has been refilled
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*/
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function randomCallback() {
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if (!randomQueue.length) {
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self.postMessage({ event: 'request-seed', amount: MAX_SIZE_RANDOM_BUFFER });
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}
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return new Promise(function(resolve, reject) {
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randomQueue.push(resolve);
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});
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}
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openpgp.crypto.random.randomBuffer.init(MAX_SIZE_RANDOM_BUFFER, randomCallback);
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/**
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* Handle messages from the main window.
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* @param {Object} event Contains event type and data
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*/
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self.onmessage = function(event) {
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var msg = event.data || {};
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switch (msg.event) {
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case 'configure':
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configure(msg.config);
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break;
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case 'seed-random':
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seedRandom(msg.buf);
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var queueCopy = randomQueue;
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randomQueue = [];
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for (var i = 0; i < queueCopy.length; i++) {
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queueCopy[i]();
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}
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break;
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default:
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delegate(msg.id, msg.event, msg.options || {});
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}
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};
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/**
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* Set config from main context to worker context.
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* @param {Object} config The openpgp configuration
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*/
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function configure(config) {
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Object.assign(openpgp.config, config);
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}
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/**
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* Seed the library with entropy gathered window.crypto.getRandomValues
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* as this api is only avalible in the main window.
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* @param {ArrayBuffer} buffer Some random bytes
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*/
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function seedRandom(buffer) {
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if (!(buffer instanceof Uint8Array)) {
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buffer = new Uint8Array(buffer);
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}
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openpgp.crypto.random.randomBuffer.set(buffer);
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}
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/**
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* Generic proxy function that handles all commands from the public api.
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* @param {String} method The public api function to be delegated to the worker thread
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* @param {Object} options The api function's options
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*/
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function delegate(id, method, options) {
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if (typeof openpgp[method] !== 'function') {
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response({ id:id, event:'method-return', err:'Unknown Worker Event' });
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return;
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}
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// parse cloned packets
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options = openpgp.packet.clone.parseClonedPackets(options, method);
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openpgp[method](options).then(function(data) {
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// clone packets (for web worker structured cloning algorithm)
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response({ id:id, event:'method-return', data:openpgp.packet.clone.clonePackets(data) });
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}).catch(function(e) {
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response({
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id:id, event:'method-return', err:e.message, stack:e.stack
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});
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});
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}
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/**
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* Respond to the main window.
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* @param {Object} event Contains event type and data
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*/
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function response(event) {
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self.postMessage(event, openpgp.util.getTransferables(event.data));
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}
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