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

'use strict';

var chatRegex = /\/chat\/channel\/(\d+)\//;
var inlineReplyIcon = "<%= UrlHelper.absolute("/images/push-notifications/inline_reply.png") %>";

function showNotification(title, body, icon, badge, tag, baseUrl, url) {
  var notificationOptions = {
    body: body,
    icon: icon,
    badge: badge,
    data: { url: url, baseUrl: baseUrl },
    tag: tag
  }

  if (chatRegex.test(url)) {
    notificationOptions['actions'] = [{
      action: "reply",
      title: "Reply",
      placeholder: "reply",
      type: "text",
      icon: inlineReplyIcon
    }];
  }

  return self.registration.showNotification(title, notificationOptions);
}

self.addEventListener('push', function(event) {
  var payload = event.data.json();

  event.waitUntil(
    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;

  if (event.action === "reply") {
    let csrf;
    fetch("/session/csrf", {
      credentials: "include",
      headers: {
        Accept: "application/json",
      },
    })
      .then((response) => {
        if (!response.ok) {
          throw new Error("Network response was not OK");
        }
        return response.json();
      })
      .then((data) => {
        csrf = data.csrf;

        let chatTest = url.match(chatRegex);
        if (chatTest.length > 0) {
          let chatChannel = chatTest[1];

          fetch(`${baseUrl}/chat/${chatChannel}.json`, {
            credentials: "include",
            headers: {
              "Content-Type": "application/x-www-form-urlencoded; charset=UTF-8",
              "X-CSRF-Token": csrf,
            },
            body: `message=${event.reply}`,
            method: "POST",
            mode: "cors",
          });
        }
      });
  } else {
    // 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('pushsubscriptionchange', function(event) {
  event.waitUntil(
    Promise.all(
      fetch('<%= Discourse.base_url %>/push_notifications/subscribe', {
        method: 'POST',
        headers: { 'Content-Type': 'application/x-www-form-urlencoded; charset=UTF-8' },
        body: new URLSearchParams({
          "subscription[endpoint]": event.newSubscription.endpoint,
          "subscription[keys][auth]": event.newSubscription.toJSON().keys.auth,
          "subscription[keys][p256dh]": event.newSubscription.toJSON().keys.p256dh,
          "send_confirmation": false
        })
      }),
      fetch('<%= Discourse.base_url %>/push_notifications/unsubscribe', {
        method: 'POST',
        headers: { 'Content-Type': 'application/x-www-form-urlencoded; charset=UTF-8' },
        body: new URLSearchParams({
          "subscription[endpoint]": event.oldSubscription.endpoint,
          "subscription[keys][auth]": event.oldSubscription.toJSON().keys.auth,
          "subscription[keys][p256dh]": event.oldSubscription.toJSON().keys.p256dh
        })
      })
    )
  );
});

self.addEventListener('message', function(event) {
  if (event.data?.action !== "primaryTab") {
    return;
  }

  event.waitUntil(
    self.clients.matchAll().then(function(clients) {
      const activeClient = clients.find(client => client.focused) || clients.find(client => client.visibilityState === "visible");

      clients.forEach(function(client) {
        client.postMessage({
          primaryTab: client.id === activeClient?.id
        });
      });
    })
  );
 });

<% DiscoursePluginRegistry.service_workers.each do |js| %>
<%=raw "#{File.read(js)}" %>
<% end %>