165 lines
7.4 KiB
JavaScript
165 lines
7.4 KiB
JavaScript
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/*
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Copyright 2018 Google LLC
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Use of this source code is governed by an MIT-style
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license that can be found in the LICENSE file or at
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https://opensource.org/licenses/MIT.
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*/
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import { assert } from 'workbox-core/_private/assert.js';
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import { timeout } from 'workbox-core/_private/timeout.js';
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import { resultingClientExists } from 'workbox-core/_private/resultingClientExists.js';
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import { logger } from 'workbox-core/_private/logger.js';
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import { responsesAreSame } from './responsesAreSame.js';
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import { CACHE_UPDATED_MESSAGE_META, CACHE_UPDATED_MESSAGE_TYPE, DEFAULT_HEADERS_TO_CHECK, NOTIFY_ALL_CLIENTS, } from './utils/constants.js';
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import './_version.js';
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// UA-sniff Safari: https://stackoverflow.com/questions/7944460/detect-safari-browser
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// TODO(philipwalton): remove once this Safari bug fix has been released.
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// https://bugs.webkit.org/show_bug.cgi?id=201169
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const isSafari = /^((?!chrome|android).)*safari/i.test(navigator.userAgent);
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/**
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* Generates the default payload used in update messages. By default the
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* payload includes the `cacheName` and `updatedURL` fields.
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*
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* @return Object
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* @private
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*/
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function defaultPayloadGenerator(data) {
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return {
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cacheName: data.cacheName,
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updatedURL: data.request.url,
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};
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}
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/**
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* Uses the `postMessage()` API to inform any open windows/tabs when a cached
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* response has been updated.
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*
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* For efficiency's sake, the underlying response bodies are not compared;
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* only specific response headers are checked.
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*
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* @memberof workbox-broadcast-update
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*/
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class BroadcastCacheUpdate {
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/**
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* Construct a BroadcastCacheUpdate instance with a specific `channelName` to
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* broadcast messages on
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*
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* @param {Object} [options]
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* @param {Array<string>} [options.headersToCheck=['content-length', 'etag', 'last-modified']]
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* A list of headers that will be used to determine whether the responses
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* differ.
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* @param {string} [options.generatePayload] A function whose return value
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* will be used as the `payload` field in any cache update messages sent
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* to the window clients.
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* @param {boolean} [options.notifyAllClients=true] If true (the default) then
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* all open clients will receive a message. If false, then only the client
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* that make the original request will be notified of the update.
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*/
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constructor({ generatePayload, headersToCheck, notifyAllClients, } = {}) {
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this._headersToCheck = headersToCheck || DEFAULT_HEADERS_TO_CHECK;
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this._generatePayload = generatePayload || defaultPayloadGenerator;
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this._notifyAllClients = notifyAllClients !== null && notifyAllClients !== void 0 ? notifyAllClients : NOTIFY_ALL_CLIENTS;
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}
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/**
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* Compares two [Responses](https://developer.mozilla.org/en-US/docs/Web/API/Response)
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* and sends a message (via `postMessage()`) to all window clients if the
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* responses differ. Neither of the Responses can be
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* [opaque](https://developer.chrome.com/docs/workbox/caching-resources-during-runtime/#opaque-responses).
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*
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* The message that's posted has the following format (where `payload` can
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* be customized via the `generatePayload` option the instance is created
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* with):
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*
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* ```
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* {
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* type: 'CACHE_UPDATED',
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* meta: 'workbox-broadcast-update',
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* payload: {
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* cacheName: 'the-cache-name',
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* updatedURL: 'https://example.com/'
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* }
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* }
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* ```
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*
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* @param {Object} options
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* @param {Response} [options.oldResponse] Cached response to compare.
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* @param {Response} options.newResponse Possibly updated response to compare.
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* @param {Request} options.request The request.
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* @param {string} options.cacheName Name of the cache the responses belong
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* to. This is included in the broadcast message.
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* @param {Event} options.event event The event that triggered
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* this possible cache update.
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* @return {Promise} Resolves once the update is sent.
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*/
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async notifyIfUpdated(options) {
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if (process.env.NODE_ENV !== 'production') {
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assert.isType(options.cacheName, 'string', {
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moduleName: 'workbox-broadcast-update',
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className: 'BroadcastCacheUpdate',
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funcName: 'notifyIfUpdated',
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paramName: 'cacheName',
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});
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assert.isInstance(options.newResponse, Response, {
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moduleName: 'workbox-broadcast-update',
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className: 'BroadcastCacheUpdate',
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funcName: 'notifyIfUpdated',
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paramName: 'newResponse',
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});
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assert.isInstance(options.request, Request, {
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moduleName: 'workbox-broadcast-update',
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className: 'BroadcastCacheUpdate',
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funcName: 'notifyIfUpdated',
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paramName: 'request',
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});
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}
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// Without two responses there is nothing to compare.
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if (!options.oldResponse) {
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return;
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}
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if (!responsesAreSame(options.oldResponse, options.newResponse, this._headersToCheck)) {
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if (process.env.NODE_ENV !== 'production') {
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logger.log(`Newer response found (and cached) for:`, options.request.url);
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}
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const messageData = {
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type: CACHE_UPDATED_MESSAGE_TYPE,
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meta: CACHE_UPDATED_MESSAGE_META,
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payload: this._generatePayload(options),
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};
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// For navigation requests, wait until the new window client exists
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// before sending the message
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if (options.request.mode === 'navigate') {
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let resultingClientId;
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if (options.event instanceof FetchEvent) {
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resultingClientId = options.event.resultingClientId;
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}
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const resultingWin = await resultingClientExists(resultingClientId);
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// Safari does not currently implement postMessage buffering and
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// there's no good way to feature detect that, so to increase the
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// chances of the message being delivered in Safari, we add a timeout.
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// We also do this if `resultingClientExists()` didn't return a client,
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// which means it timed out, so it's worth waiting a bit longer.
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if (!resultingWin || isSafari) {
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// 3500 is chosen because (according to CrUX data) 80% of mobile
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// websites hit the DOMContentLoaded event in less than 3.5 seconds.
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// And presumably sites implementing service worker are on the
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// higher end of the performance spectrum.
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await timeout(3500);
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}
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}
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if (this._notifyAllClients) {
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const windows = await self.clients.matchAll({ type: 'window' });
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for (const win of windows) {
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win.postMessage(messageData);
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}
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}
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else {
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// See https://github.com/GoogleChrome/workbox/issues/2895
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if (options.event instanceof FetchEvent) {
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const client = await self.clients.get(options.event.clientId);
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client === null || client === void 0 ? void 0 : client.postMessage(messageData);
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}
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}
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}
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}
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}
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export { BroadcastCacheUpdate };
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