Send Slack Notifcations On Signup

To get slack notifications of a new user sign up you can hook into the user events, in this case the post user signup event.

<?php

namespace App\User\Event;

use App\Entity\User;
use Parthenon\Notification\Slack\MessageBuilder;
use Parthenon\Notification\Slack\WebhookPosterInterface;
use Parthenon\User\Event\PostUserSignupEvent;
use Symfony\Component\EventDispatcher\EventSubscriberInterface;

class SignupSubscriber implements EventSubscriberInterface
{
    public function __construct(private WebhookPosterInterface $webhookPoster, private string $webhookUrl)
    {
    }

    public function handleUserSignUp(PostUserSignupEvent $postUserSignupEvent)
    {
        /** @var User $user */
        $user = $postUserSignupEvent->getUser();

        $mb = new MessageBuilder();
        $mb->addMarkdownSection(sprintf(':tada: *A new user has signed up!* %s', $user->getEmail()))->closeSection();

        $this->webhookPoster->send($this->webhookUrl, $mb->build());
    }

    public static function getSubscribedEvents()
    {
        return [
            PostUserSignupEvent::NAME => 'handleUserSignUp',
        ];
    }
}

For the purposes of this recipe you ened to have the webhook url you want to use. It's best to create an env variable for this and use the .env file

SLACK_WEBHOOK_URL="https://hooks.slack.com/services/..."

In your services.yaml file put this to assign the webhook url to the argument since it can't be autowired.

services:
  // ...

    App\User\Event\SignupSubscriber:
        arguments:
            $webhookUrl: '%env(resolve:SLACK_WEBHOOK_URL)%'

To avoid getting slack notifications from your test suite you want to switch out the webhook poster for a null webhook poster. So in your services_test.yaml file put

services:
  // ...

    Parthenon\Notification\Slack\WebhookPosterInterface: '@Parthenon\Notification\Slack\NullWebhookPoster'