liwo/app/Listeners/TaskCreateNotif.php

<?php

namespace App\Listeners;

use App\Events\TaskCreate;
use App\Models\Task;
use App\Models\User;
use App\Notifications\DBNotification;
use App\Notifications\FcmNotification;
use App\Notifications\MailNotification;
use Illuminate\Support\Facades\Notification;

class TaskCreateNotif
{
    /**
     * Create the event listener.
     *
     * @return void
     */
    public function __construct()
    {
        //
    }

    /**
     * Handle the event.
     *
     * @param  TaskCreate  $event
     * @return void
     */
    public function handle(TaskCreate $event)
    {
        $payload = $event->message;

        if ($payload->data->original->assignee_id !== null) {
            $this->assigneeNotifHandler($payload);
        }
        if ($payload->data->original->approver_id !== null) {
            $this->approverNotifHandler($payload);
        }
    }

    public function assigneeNotifHandler($payload) {
        $user = User::findOrFail($payload->data->original->assignee_id);
        $task = Task::findOrFail($payload->data->original->id);

        $notif = $this->makeNotif($payload, 'assignee', ['task' => $task->title]);

        $this->sendNotifications($user, $notif);
    }

    public function approverNotifHandler($payload) {
        $user = User::findOrFail($payload->data->original->approver_id);
        $task = Task::findOrFail($payload->data->original->id);

        $notif = $this->makeNotif($payload, 'approver', ['task' => $task->title]);

        $this->sendNotifications($user, $notif);
    }

    /**
     * Make notification object
     *
     * @param $payload
     * @param null $route
     * @param array $options
     * @return array
     */
    public function makeNotif($payload, $route = null, $options = []) {
        $route = $route == null ? "" : $route.'.';
        return [
            'greeting' => $this->getMessageLine($payload, $route.'greeting'),
            'subject' => $this->getMessageLine($payload, $route.'subject'),
            'title' => $this->getMessageLine($payload, $route.'title'),
            'body' => $this->getMessageLine($payload, $route.'body', $options)
        ];
    }

    /**
     * Fetch message from notifications lang file
     *
     * @param $payload
     * @param $key
     * @param null $options
     * @return array|\Illuminate\Contracts\Foundation\Application|\Illuminate\Contracts\Translation\Translator|string|null
     *
     */
    public function getMessageLine($payload, $key, $options = [])
    {
        return __('notification.'.$payload->data->table_name.'.'.enum('cruds.inverse.'.$payload->data->crud_id.'.singular_name').'.'.$key, $options);
    }

    /**
     * Call notifications
     *
     * @param $users
     * @param $notif
     */
    public function sendNotifications($users, $notif) {
        Notification::send($users, new MailNotification($notif));
        Notification::send($users, new DBNotification($notif));
        Notification::send($users, new FcmNotification($notif));
    }
}