invoiceninja/app/Notifications/ClientContactRequestCancellation.php

<?php
/**
 * Invoice Ninja (https://invoiceninja.com).
 *
 * @link https://github.com/invoiceninja/invoiceninja source repository
 *
 * @copyright Copyright (c) 2021. Invoice Ninja LLC (https://invoiceninja.com)
 *
 * @license https://opensource.org/licenses/AAL
 */

namespace App\Notifications;

use Closure;
use Illuminate\Bus\Queueable;
use Illuminate\Contracts\Queue\ShouldQueue;
use Illuminate\Foundation\Bus\Dispatchable;
use Illuminate\Notifications\Messages\MailMessage;
use Illuminate\Notifications\Messages\SlackMessage;
use Illuminate\Notifications\Notification;
use Illuminate\Queue\InteractsWithQueue;
use Illuminate\Queue\SerializesModels;
use Illuminate\Support\Facades\Mail;

//@deprecated for mail
class ClientContactRequestCancellation extends Notification 
{
  //  use Dispatchable, InteractsWithQueue, Queueable, SerializesModels;

    /**
     * Create a new notification instance.
     *
     * @return void
     */
    protected $recurring_invoice;

    protected $client_contact;

    /**
     * The callback that should be used to build the mail message.
     *
     * @var Closure|null
     */
    public static $toMailCallback;

    public function __construct($recurring_invoice, $client_contact)
    {
        $this->recurring_invoice = $recurring_invoice;
        $this->client_contact = $client_contact;
    }

    /**
     * Get the notification's delivery channels.
     *
     * @param  mixed  $notifiable
     * @return array
     */
    public function via($notifiable)
    {
        return ['slack'];
    }

    /**
     * Get the mail representation of the notification.
     *
     * @param  mixed  $notifiable
     * @return MailMessage
     */
    public function toMail($notifiable)
    {
    }

    /**
     * Get the array representation of the notification.
     *
     * @param  mixed  $notifiable
     * @return array
     */
    public function toArray($notifiable)
    {
        return [
            //
        ];
    }

    public function toSlack($notifiable)
    {
        $name = $this->client_contact->present()->name();
        $client_name = $this->client_contact->client->present()->name();
        $recurring_invoice_number = $this->recurring_invoice->number;

        return (new SlackMessage)
                ->success()
                ->to('#devv2')
                ->from('System')
                ->image('https://app.invoiceninja.com/favicon.png')
                ->content("Contact {$name} from client {$client_name} requested to cancel Recurring Invoice #{$recurring_invoice_number}");
    }

    /**
     * Set a callback that should be used when building the notification mail message.
     *
     * @param  Closure  $callback
     * @return void
     */
    public static function toMailUsing($callback)
    {
        static::$toMailCallback = $callback;
    }
}