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/// <reference types="@sveltejs/kit" />
/// <reference no-default-lib="true"/>
/// <reference lib="esnext" />
/// <reference lib="webworker" />
// Because of this line, this service worker won't run in dev mode in Firefox.
// Only Safari, Edge, Chrome can run it at the moment, because only they
// support modules in service workers.
//
// That's okay! If you run `tools/run` with PILCROW_DEV unset, you will get the
// bundled version, and can work on it. Or just use Safari.
import { build, files, version } from '$service-worker';
// Create a unique cache name for this deployment
const CACHE = `cache-${version}`;
const ASSETS = [
...build, // the app itself
...files, // everything in `static`
];
self.addEventListener('install', (event) => {
// Create a new cache and add all files to it
async function addFilesToCache() {
const cache = await caches.open(CACHE);
await cache.addAll(ASSETS);
}
event.waitUntil(addFilesToCache());
});
self.addEventListener('activate', (event) => {
// Remove previous cached data from disk
async function deleteOldCaches() {
for (const key of await caches.keys()) {
if (key !== CACHE) await caches.delete(key);
}
}
event.waitUntil(deleteOldCaches());
});
// The simplest possible use of the caches above:
async function cacheFirst(request) {
const responseFromCache = await caches.match(request);
if (responseFromCache) {
return responseFromCache;
}
return fetch(request);
}
self.addEventListener('fetch', (event) => {
event.respondWith(cacheFirst(event.request));
});
const conversationReadStatus = {
// Format:
// conversationId: { lastRead: Optional(Datetime), lastMessage: Datetime }
};
function countUnreadChannels() {
return Object.values(conversationReadStatus)
.map(({ lastRead, lastMessage }) => {
return !lastRead || lastRead < lastMessage ? 1 : 0;
})
.reduce((total, current) => total + current, 0);
}
self.addEventListener('push', (event) => {
// Let's show a notification right away so Safari doesn't tell Apple to be
// mad at us:
event.waitUntil(
self.registration.showNotification('Test notification', {
actions: [],
body: event.data.text(),
}),
);
// Now we can do slower things that might fail:
conversationReadStatus[event.conversationId] ||= { lastRead: null, lastMessage: null };
conversationReadStatus[event.conversationId].lastMessage = new Date();
event.waitUntil(
(async () => {
if (navigator.setAppBadge) {
navigator.setAppBadge(countUnreadChannels());
}
})(),
);
});
// The client has to tell us when it has read a conversation:
self.addEventListener('message', (event) => {
switch (event.data?.type) {
case 'CONVERSATION_READ':
conversationReadStatus[event.data.conversationId] ||= { lastRead: null, lastMessage: null };
conversationReadStatus[event.data.conversationId].lastMessage = event.data.at || new Date();
event.waitUntil(
(async () => {
if (navigator.setAppBadge) {
navigator.setAppBadge(countUnreadChannels());
}
})(),
);
break;
default:
break;
}
});
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