[Feat] Allow people to subscribe to Cachet updates

[joelbutcher]

Subscribers and email notifications is a huge topic for this repo. This PR is the first in a line of PR's for this feature.

This PR allows users to register their interest in subscribing to email updates with Cachet.

User flow

Create a new view with a form for users to register interest.

This bit took the longest, as I'm not much of a frontend developer but by leaning into the forms stuff filament has, we're able to create a clean form that matches the cachet status-page theming as close as possible (a few things like border and ring don't translate here).

Success banner

I've added a new "success" banner which will show whenever session()->flash('success') is set:

Subscriber email verification

By extending Laravel's default VerifyEmail notification class, all we need to do is change the URL that is generated and register the verification route. Laravel takes care of the rest as long as the model can be ->notify()'d.

Note

We might want to change the email message and template theme in the future

Verification

User gets verified and another success banner is shown:

[joelbutcher]

@jbrooksuk this PR supersedes #215

[jbrooksuk]

Huge work, @joelbutcher 👏🏻

I'm going to make a couple of changes here before we merge. Mostly in design of the success banner :)

[jbrooksuk]

@joelbutcher I've made a couple of small changes so far. The success banner is now a toast as I found it strange seeing the status bar (which can be in a "successful" state).

There's a few things we need to address here:

1. We need to add a setting to "Manage Cachet" that allows you to enable subscribers. We do have a setting in 2.4 that we'll need to migrate too (I think I did that already).
2. What happens if you subscribe to Cachet, then I enter your email address and change your settings without you knowing? I wonder if, when you're subscribed, we send an email that sends you to a signed URL that allows you to change your subscriptions.
3. This can be a future feature, but we should allow subscribing to groups and "new incidents".

[joelbutcher]

@jbrooksuk thanks!

We need to add a setting to "Manage Cachet" that allows you to enable subscribers. We do have a setting in 2.4 that we'll need to migrate too (I think I did that already).

Is this something you want doing in this PR, or in another one?

What happens if you subscribe to Cachet, then I enter your email address and change your settings without you knowing? I wonder if, when you're subscribed, we send an email that sends you to a signed URL that allows you to change your subscriptions.

• Can this happen? I thought there was a unique column restriction on the subscribers table? The form currently only creates a subscriber, so if I enter another users email address and change the settings, it should either error out, or just redirect and not make any changes.

• For the Signed URL thing that would make sense to me - I'll add that into this PR

we should allow subscribing to groups and "new incidents".

I was thinking of having a toggle in each group that was "subscribe to all updates for :group".

[AdoDreamtilt]

Any chance you can also have a mobile number added with subscriber submission option for SMS messages for the subscribers? (And allow for future SMS integration with SMS providers to subscribers?)

[jbrooksuk]

@AdoDreamtilt this is something we'll look into bringing back once we have the main system in place 👍🏻

I do think we'll need to pick one (maybe two) SMS providers though - or provide a way for Cachet to add additional providers easily.