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Refactor and document sw.js file

This commit is contained in:
nimbleghost 2023-06-14 20:47:56 +02:00
parent 4dc89f6bc5
commit eebe4f8920

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@ -6,10 +6,165 @@ import { NetworkFirst } from "workbox-strategies";
import { dbAsync } from "../src/app/db";
import { formatMessage, formatTitleWithDefault } from "../src/app/notificationUtils";
// See WebPushWorker, this is to play a sound on supported browsers,
// if the app is in the foreground
/**
* General docs for service workers and PWAs:
* https://vite-pwa-org.netlify.app/guide/
* https://developer.chrome.com/docs/workbox/
*
* This file uses the (event) => event.waitUntil(<promise>) pattern.
* This is because the event handler itself cannot be async, but
* the service worker needs to stay active while the promise completes.
*/
const broadcastChannel = new BroadcastChannel("web-push-broadcast");
const isImage = (filenameOrUrl) => filenameOrUrl?.match(/\.(png|jpe?g|gif|webp)$/i) ?? false;
const addNotification = async (data) => {
const db = await dbAsync();
const { subscription_id: subscriptionId, message } = data;
await db.notifications.add({
...message,
subscriptionId,
// New marker (used for bubble indicator); cannot be boolean; Dexie index limitation
new: 1,
});
await db.subscriptions.update(subscriptionId, {
last: message.id,
});
const badgeCount = await db.notifications.where({ new: 1 }).count();
console.log("[ServiceWorker] Setting new app badge count", { badgeCount });
self.navigator.setAppBadge?.(badgeCount);
};
const showNotification = (data) => {
const { subscription_id: subscriptionId, message } = data;
// Please update the desktop notification in Notifier.js to match any changes here
const image = isImage(message.attachment?.name) ? message.attachment.url : undefined;
self.registration.showNotification(formatTitleWithDefault(message, message.topic), {
tag: subscriptionId,
body: formatMessage(message),
icon: image ?? "/static/images/ntfy.png",
image,
data,
timestamp: message.time * 1_000,
actions: message.actions
?.filter(({ action }) => action === "view" || action === "http")
.map(({ label }) => ({
action: label,
title: label,
})),
});
};
/**
* Handle a received web push notification
* @param {object} data see server/types.go, type webPushPayload
*/
const handlePush = async (data) => {
if (data.event === "subscription_expiring") {
await self.registration.showNotification("Notifications will be paused", {
body: "Open ntfy to continue receiving notifications",
icon: "/static/images/ntfy.png",
data,
});
} else if (data.event === "message") {
// see: web/src/app/WebPush.js
// the service worker cannot play a sound, so if the web app
// is running, it receives the broadcast and plays it.
broadcastChannel.postMessage(data.message);
await addNotification(data);
await showNotification(data);
} else {
// We can't ignore the push, since permission can be revoked by the browser
await self.registration.showNotification("Unknown notification received from server", {
body: "You may need to update ntfy by opening the web app",
icon: "/static/images/ntfy.png",
data,
});
}
};
/**
* Handle a user clicking on the displayed notification from `showNotification`
* This is also called when the user clicks on an action button
*/
const handleClick = async (event) => {
const clients = await self.clients.matchAll({ type: "window" });
const rootUrl = new URL(self.location.origin);
const rootClient = clients.find((client) => client.url === rootUrl.toString());
if (event.notification.data?.event !== "message") {
// e.g. subscription_expiring event, simply open the web app on the root route (/)
if (rootClient) {
rootClient.focus();
} else {
self.clients.openWindow(rootUrl);
}
event.notification.close();
} else {
const { message } = event.notification.data;
if (event.action) {
const action = event.notification.data.message.actions.find(({ label }) => event.action === label);
if (action.action === "view") {
self.clients.openWindow(action.url);
} else if (action.action === "http") {
try {
const response = await fetch(action.url, {
method: action.method ?? "POST",
headers: action.headers ?? {},
body: action.body,
});
if (!response.ok) {
throw new Error(`HTTP ${response.status} ${response.statusText}`);
}
} catch (e) {
console.error("[ServiceWorker] Error performing http action", e);
self.registration.showNotification(`Unsuccessful action ${action.label} (${action.action})`, {
body: e.message,
});
}
}
if (action.clear) {
event.notification.close();
}
} else if (message.click) {
self.clients.openWindow(message.click);
event.notification.close();
} else {
// If no action was clicked, and the message doesn't have a click url:
// - first try focus an open tab on the `/:topic` route
// - if not, an open tab on the root route (`/`)
// - if no ntfy window is open, open a new tab on the `/:topic` route
const topicUrl = new URL(message.topic, self.location.origin);
const topicClient = clients.find((client) => client.url === topicUrl.toString());
if (topicClient) {
topicClient.focus();
} else if (rootClient) {
rootClient.focus();
} else {
self.clients.openWindow(topicUrl);
}
event.notification.close();
}
}
};
self.addEventListener("install", () => {
console.log("[ServiceWorker] Installed");
self.skipWaiting();
@ -28,153 +183,35 @@ self.addEventListener("pushsubscriptionchange", (event) => {
});
self.addEventListener("push", (event) => {
// server/types.go webPushPayload
const data = event.data.json();
console.log("[ServiceWorker] Received Web Push Event", { event, data });
event.waitUntil(
(async () => {
if (data.event === "subscription_expiring") {
await self.registration.showNotification("Notifications will be paused", {
body: "Open ntfy to continue receiving notifications",
icon: "/static/images/ntfy.png",
data,
});
} else if (data.event === "message") {
const { subscription_id: subscriptionId, message } = data;
broadcastChannel.postMessage(message);
const db = await dbAsync();
const image = message.attachment?.name.match(/\.(png|jpe?g|gif|webp)$/i) ? message.attachment.url : undefined;
const actions = message.actions
?.filter(({ action }) => action === "view" || action === "http")
.map(({ label }) => ({
action: label,
title: label,
}));
await Promise.all([
(async () => {
await db.notifications.add({
...message,
subscriptionId,
// New marker (used for bubble indicator); cannot be boolean; Dexie index limitation
new: 1,
});
const badgeCount = await db.notifications.where({ new: 1 }).count();
console.log("[ServiceWorker] Setting new app badge count", { badgeCount });
self.navigator.setAppBadge?.(badgeCount);
})(),
db.subscriptions.update(subscriptionId, {
last: message.id,
}),
// Please update the desktop notification in Notifier.js to match any changes
self.registration.showNotification(formatTitleWithDefault(message, message.topic), {
tag: subscriptionId,
body: formatMessage(message),
icon: image ?? "/static/images/ntfy.png",
image,
data,
timestamp: message.time * 1_000,
actions,
}),
]);
} else {
// We can't ignore the push, since permission can be revoked by the browser
await self.registration.showNotification("Unknown notification received from server", {
body: "You may need to update ntfy by opening the web app",
icon: "/static/images/ntfy.png",
data,
});
}
})()
);
event.waitUntil(handlePush(data));
});
self.addEventListener("notificationclick", (event) => {
console.log("[ServiceWorker] NotificationClick");
event.waitUntil(
(async () => {
const clients = await self.clients.matchAll({ type: "window" });
const rootUrl = new URL(self.location.origin);
const rootClient = clients.find((client) => client.url === rootUrl.toString());
if (event.notification.data?.event !== "message") {
if (rootClient) {
rootClient.focus();
} else {
self.clients.openWindow(rootUrl);
}
event.notification.close();
} else {
const { message } = event.notification.data;
if (event.action) {
const action = event.notification.data.message.actions.find(({ label }) => event.action === label);
if (action.action === "view") {
self.clients.openWindow(action.url);
if (action.clear) {
event.notification.close();
}
} else if (action.action === "http") {
try {
const response = await fetch(action.url, {
method: action.method ?? "POST",
headers: action.headers ?? {},
body: action.body,
});
if (!response.ok) {
throw new Error(`HTTP ${response.status} ${response.statusText}`);
}
if (action.clear) {
event.notification.close();
}
} catch (e) {
console.error("[ServiceWorker] Error performing http action", e);
self.registration.showNotification(`Unsuccessful action ${action.label} (${action.action})`, {
body: e.message,
});
}
}
} else if (message.click) {
self.clients.openWindow(message.click);
event.notification.close();
} else {
const topicUrl = new URL(message.topic, self.location.origin);
const topicClient = clients.find((client) => client.url === topicUrl.toString());
if (topicClient) {
topicClient.focus();
} else if (rootClient) {
rootClient.focus();
} else {
self.clients.openWindow(topicUrl);
}
event.notification.close();
}
}
})()
);
event.waitUntil(handleClick(event));
});
// self.__WB_MANIFEST is default injection point
// eslint-disable-next-line no-underscore-dangle
precacheAndRoute(self.__WB_MANIFEST);
// see https://vite-pwa-org.netlify.app/guide/inject-manifest.html#service-worker-code
// self.__WB_MANIFEST is the workbox injection point that injects the manifest of the
// vite dist files and their revision ids, for example:
// [{"revision":"aaabbbcccdddeeefff12345","url":"/index.html"},...]
precacheAndRoute(
// eslint-disable-next-line no-underscore-dangle
self.__WB_MANIFEST
);
// clean old assets
// delete any cached old dist files from previous service worker versions
cleanupOutdatedCaches();
// to allow work offline
if (import.meta.env.MODE !== "development") {
// since the manifest only includes `/index.html`, this manually adds the root route `/`
registerRoute(new NavigationRoute(createHandlerBoundToURL("/")));
// the manifest excludes config.js (see vite.config.js) since the dist-file differs from the
// actual config served by the go server. this adds it back with `NetworkFirst`, so that the
// most recent config from the go server is cached, but the app still works if the network
// is unavailable. this is important since there's no "refresh" button in the installed pwa
// to force a reload.
registerRoute(({ url }) => url.pathname === "/config.js", new NetworkFirst());
}