SATE-EasyReceipt/app/Notifications/SlackNotification.php

<?php

namespace App\Notifications;

use App\Codes\QueueName;
use Illuminate\Bus\Queueable;
use Illuminate\Contracts\Queue\ShouldQueue;
use Illuminate\Notifications\Notification;
use Illuminate\Notifications\Slack\SlackMessage;

class SlackNotification extends Notification implements ShouldQueue
{
    use Queueable;

    protected $channel;
    protected $icon;
    protected $name;
    protected $message;

    /**
     * Create a new notification instance.
     */
    public function __construct($message)
    {
        // Slackに関数する情報はconfigに定義しておく
        $this->channel = config('slack.channel');
        $this->icon = config('slack.icon');
        $this->name = config('slack.sender_name');
        $this->message = $message;
    }

    /**
     * Get the notification's delivery channels.
     *
     * @return array<int, string>
     */
    public function via(object $notifiable): array
    {
        return ['slack'];
    }

    /**
     * Get the array representation of the notification.
     *
     * @return array<string, mixed>
     */
    public function toArray(object $notifiable): array
    {
        return [
            //
        ];
    }

    /**
     * Get the Slack representation of the notification.
     * @param mixed $notifiable
     * @return SlackMessage
     */
    public function toSlack(object $notifiable): SlackMessage
    {
        return (new SlackMessage)
            ->text($this->message);
    }

    /**
     * 各通知チャンネルで使用するキューを判断。
     *
     * @return array<string, string>
     */
    public function viaQueues(): array
    {
        return [
            'slack' => QueueName::JOB->value,
        ];
    }
}