discourse/app/assets/javascripts/service-worker.js.erb

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'use strict';
importScripts("<%= "#{Discourse.asset_host}#{Discourse.base_path}/javascripts/workbox/workbox-sw.js" %>");
workbox.setConfig({
modulePathPrefix: "<%= "#{Discourse.asset_host}#{Discourse.base_path}/javascripts/workbox" %>",
debug: false
});
const cacheVersion = "1";
// Cache all GET requests, so Discourse can be used while offline
workbox.routing.registerRoute(
new RegExp('.*?'), // Matches all, GET is implicit
new workbox.strategies.NetworkFirst({ // This will only use the cache when a network request fails
cacheName: "discourse-" + cacheVersion,
plugins: [
new workbox.expiration.Plugin({
maxAgeSeconds: 7* 24 * 60 * 60, // 7 days
maxEntries: 500,
purgeOnQuotaError: true, // safe to automatically delete if exceeding the available storage
}),
],
})
);
const idleThresholdTime = 1000 * 10; // 10 seconds
var lastAction = -1;
function isIdle() {
return lastAction + idleThresholdTime < Date.now();
}
function showNotification(title, body, icon, badge, tag, baseUrl, url) {
var notificationOptions = {
body: body,
icon: icon,
badge: badge,
data: { url: url, baseUrl: baseUrl },
tag: tag
}
return self.registration.showNotification(title, notificationOptions);
}
self.addEventListener('push', function(event) {
var payload = event.data.json();
if(!isIdle() && payload.hide_when_active) {
return false;
}
event.waitUntil(
self.registration.getNotifications({ tag: payload.tag }).then(function(notifications) {
if (notifications && notifications.length > 0) {
notifications.forEach(function(notification) {
notification.close();
});
}
return showNotification(payload.title, payload.body, payload.icon, payload.badge, payload.tag, payload.base_url, payload.url);
})
);
});
self.addEventListener('notificationclick', function(event) {
// Android doesn't close the notification when you click on it
// See: http://crbug.com/463146
event.notification.close();
var url = event.notification.data.url;
var baseUrl = event.notification.data.baseUrl;
// This looks to see if the current window is already open and
// focuses if it is
event.waitUntil(
clients.matchAll({ type: "window" })
.then(function(clientList) {
var reusedClientWindow = clientList.some(function(client) {
if (client.url === baseUrl + url && 'focus' in client) {
client.focus();
return true;
}
if ('postMessage' in client && 'focus' in client) {
client.focus();
client.postMessage({ url: url });
return true;
}
return false;
});
if (!reusedClientWindow && clients.openWindow) return clients.openWindow(baseUrl + url);
})
);
});
self.addEventListener('message', function(event) {
if('lastAction' in event.data){
lastAction = event.data.lastAction;
}});
<% DiscoursePluginRegistry.service_workers.each do |js| %>
<%=raw "#{File.read(js)}" %>
<% end %>