scrum-poker-internal/app/Services/Rooms/RoomPlayerInstanceService.php

<?php

namespace App\Services\Rooms;

use Illuminate\Http\Request;
use Illuminate\Support\Str;

class RoomPlayerInstanceService
{
    private const string SESSION_KEY = 'room_player_instance_id';

    public function for(Request $request): string
    {
        $instanceId = $request->session()->get(self::SESSION_KEY);

        if (is_string($instanceId) && Str::isUuid($instanceId)) {
            return $instanceId;
        }

        $instanceId = (string) Str::uuid();
        $request->session()->put(self::SESSION_KEY, $instanceId);

        return $instanceId;
    }
}