notesnook/apps/web/src/service-worker.js

/*
This file is part of the Notesnook project (https://notesnook.com/)

Copyright (C) 2023 Streetwriters (Private) Limited

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

/* eslint-disable no-restricted-globals */
// This service worker can be customized!
// See https://developers.google.com/web/tools/workbox/modules
// for the list of available Workbox modules, or add any other
// code you'd like.
// You can also remove this file if you'd prefer not to use a
// service worker, and the Workbox build step will be skipped.

import { clientsClaim } from "workbox-core";
import { ExpirationPlugin } from "workbox-expiration";
import { precacheAndRoute, createHandlerBoundToURL } from "workbox-precaching";
import { registerRoute } from "workbox-routing";
import { StaleWhileRevalidate } from "workbox-strategies";

clientsClaim();

// Precache all of the assets generated by your build process.
// Their URLs are injected into the manifest variable below.
// This variable must be present somewhere in your service worker file,
// even if you decide not to use precaching. See https://cra.link/PWA
/**
 * @type {import("workbox-precaching/_types").PrecacheEntry[]}
 */
var precacheRoutes = self.__WB_MANIFEST;
const filters = [/KaTeX/i, /hack/i, /code-lang-/i];
precacheAndRoute(
  precacheRoutes.filter((route) => {
    return filters.every((filter) => !filter.test(route.url));
  })
);

// Set up App Shell-style routing, so that all navigation requests
// are fulfilled with your index.html shell. Learn more at
// https://developers.google.com/web/fundamentals/architecture/app-shell
const fileExtensionRegexp = new RegExp("/[^/?]+\\.[^/]+$");
registerRoute(
  // Return false to exempt requests from being fulfilled by index.html.
  ({ request, url }) => {
    // If this isn't a navigation, skip.
    if (request.mode !== "navigate") {
      return false;
    } // If this is a URL that starts with /_, skip.

    if (url.pathname.startsWith("/_")) {
      return false;
    } // If this looks like a URL for a resource, because it contains // a file extension, skip.

    if (url.pathname.match(fileExtensionRegexp)) {
      return false;
    } // Return true to signal that we want to use the handler.

    return true;
  },
  createHandlerBoundToURL(process.env.PUBLIC_URL + "/index.html")
);

// An example runtime caching route for requests that aren't handled by the
// precache, in this case same-origin .png requests like those from in public/
registerRoute(
  // Add in any other file extensions or routing criteria as needed.
  ({ url }) =>
    url.origin === self.location.origin && url.pathname.endsWith(".png"), // Customize this strategy as needed, e.g., by changing to CacheFirst.
  new StaleWhileRevalidate({
    cacheName: "images",
    plugins: [
      // Ensure that once this runtime cache reaches a maximum size the
      // least-recently used images are removed.
      new ExpirationPlugin({ maxEntries: 50 })
    ]
  })
);

// This allows the web app to trigger skipWaiting via
// registration.waiting.postMessage({type: 'SKIP_WAITING'})
self.addEventListener("message", (event) => {
  const { data } = event;
  if (!data) return;

  switch (data.type) {
    case "SKIP_WAITING":
      self.skipWaiting();
      break;
    case "GET_VERSION":
      {
        const VERSION = process.env.REACT_APP_VERSION;
        const HASH = process.env.REACT_APP_GIT_HASH;
        event.source.postMessage({
          type: data.type,
          version: VERSION,
          hash: HASH
        });
      }
      break;
    default:
      break;
  }
});