Custom flashes messages with link sf 5.3

_flashes_messages.html.twig

{# just need to include this layout in your frame/base #}
{% block flashes_messages %}
    {% set flashes = app.flashes %}

    {% for type, messages in flashes %}
        {% for message in messages %}
            <div class="alert alert-{{ type }} alert-dismissible show fade" role="alert">
                <button type="button" class="close" style="padding:0.9rem;" data-dismiss="alert" aria-label="Close">
                    <i aria-hidden="true" data-feather="x"></i>
                </button>
                <div class="alert-icon">
                    <i class="far fa-fw fa-bell"></i>
                </div>
                {% if message is iterable %}
                    <div class="alert-message pr-5">
                        {{ message.message|trans(message.parameters, message.domain) }}
                        {% if message.options.action_url is defined %}
                            <div class="float-right border-right border-2 border-dark">
                                <a href="{{ message.options.action_url }}" class="text-dark mr-3 font-weight-bold">{{ message.options.action_label|trans|upper }}</a>
                            </div>
                        {% endif %}
                    </div>
                {% else %}
                    <div class="alert-message">
                        {{ message|trans({}, 'flashes') }}
                    </div>
                {% endif %}
            </div>
        {% endfor %}
    {% endfor %}
{% endblock %}

flashes.fr.yml

example:
  flash: 'This is an example of flash'
  action: 'ACTION'

FlashFactory.php

<?php

namespace App\Core\Utils;

use Symfony\Component\HttpFoundation\Session\Session;
use Symfony\Component\HttpFoundation\Session\SessionInterface;

class FlashFactory
{
    const TYPE_DANGER = 'danger';
    const TYPE_INFO = 'info';
    const TYPE_SUCCESS = 'success';
    const TYPE_WARNING = 'warning';

    protected $session;

    /**
     * FlashFactory constructor.
     *
     * @param Session|SessionInterface $session
     */
    public function __construct(SessionInterface $session)
    {
        $this->session = $session;
    }

    /**
     * Creates a Flash message with parameters.
     *
     * @param string $type
     * @param string $messageId
     * @param array  $parameters
     * @param string $domain
     *
     * @return bool
     */
    public function create(string $type, string $message, array $parameters = [], $options = [], $domain = 'flashes')
    {
        return $this->addFlash($type, [
            'message' => $message,
            'parameters' => $parameters,
            'options' => $options,
            'domain' => $domain,
        ]);
    }

    /**
     * Creates a simple flash message.
     *
     * @param string $type
     * @param string $message
     *
     * @return bool
     */
    public function createSimple(string $type, string $message)
    {
        return $this->addFlash($type, $message);
    }

    /**
     * Adds a flash message to the current session for type.
     *
     * @param string       $type    The type
     * @param string|array $message The message
     *
     * @return bool
     */
    protected function addFlash($type, $message)
    {
        try {
            $this->session->getFlashBag()->add($type, $message);

            return true;
        } catch (\Exception $ex) {
            return false;
        }
    }
}

YourController.php

<?php

use App\Core\Utils\FlashFactory;


class YourController extends AbstractController
{
   /**
     * @var FlashFactory
     */
    protected $flashFactory;

   /**
     * (..)
     * @param FlashFactory            $flashFactory
     */
    public function __construct((...), FlashFactory $flashFactory) 
    {
      (..)
      $this->flashFactory = $flashFactory;
    }

    public function yourFunction()
    {
      $this->flashFactory->create('success', 'example.flash', [], ['action_url' => $url, 'action_label' => 'example.action']);
    }
}