FR: Support webpush.fcm_options.link for opening another domain.

[rockmandash]

[REQUIRED] Describe your environment

• Operating System version: macOS 12.0.1
• Browser version: Chrome 96
• Firebase SDK version: 9.6.1
• Firebase Product: cloud messaging

[REQUIRED] Describe the problem

According to the code below, when a user clicks the notification from FCM, it can only open the same domain.

firebase-js-sdk/packages/messaging/src/listeners/sw-listeners.ts

Lines 130 to 136 in cdada6c

	// FM should only open/focus links from app's origin.
	const url = new URL(link, self.location.href);
	const originUrl = new URL(self.location.origin);
	if (url.host !== originUrl.host) {
	return;
	}

It would be fantastic if we could open a URL from another domain.

For the time being, I've devised a workaround: directly above the call to firebase.messaging(), insert your own notificationclick:

self.addEventListener('notificationclick', event => {
  const url = event.notification.data.FCM_MSG.notification.click_action
  
  clients.openWindow(url)
})

firebase.messaging()

It is necessary to install an event listener sooner rather than later since it will be halted by the following line:

firebase-js-sdk/packages/messaging/src/listeners/sw-listeners.ts

Lines 121 to 122 in cdada6c

	event.stopImmediatePropagation();
	event.notification.close();

[guimap]

Up for this current thread, I'm having this same issue :/
There's any update ?