joomla-oauth-server/plg_system_oauthserver/src/Extension/Plugin.php

<?php

namespace Webmasterskaya\Plugin\System\OauthServer\Extension;

use Joomla\CMS\Factory;
use Joomla\CMS\Plugin\CMSPlugin;
use Joomla\CMS\Router\SiteRouter;
use Joomla\CMS\Uri\Uri;
use Joomla\Event\SubscriberInterface;

class Plugin extends CMSPlugin implements SubscriberInterface
{
    public static function getSubscribedEvents(): array
    {
        return ['onAfterInitialise' => 'attachOauthRouter'];
    }

    public function attachOauthRouter(): void
    {
        /** @var \Joomla\CMS\Application\SiteApplication $app */
        $app = $this->getApplication();

        if (!$app->isClient('site')) {
            return;
        }

        /** @var \Joomla\CMS\Router\SiteRouter $siteRouter */
        $siteRouter = Factory::getContainer()->get(SiteRouter::class);
        $siteRouter->attachParseRule([$this, 'parseOauthRoute'], $siteRouter::PROCESS_BEFORE);
    }

    /**
     * @param \Joomla\CMS\Router\SiteRouter $router
     * @param \Joomla\CMS\Uri\Uri $uri
     * @return void
     * @since version
     */
    public function parseOauthRoute(SiteRouter &$router, Uri &$uri): void
    {
        $route = trim($uri->getPath(), '/');

        if (empty($route)) {
            return;
        }

        // TODO: Переделать на ComponentRouter (пример в Joomla\CMS\Router\SiteRouter::parseSefRoute())
        //       1. Зарегистрировать роутер компонента $router->setComponentRouter()
        //       2. Вызвать $router->getComponentRouter($component)
        if (!str_starts_with($route, 'login/oauth')) {
            return;
        }

        $segments = explode('/', $route);

        $uri->setVar('option', 'com_oauthserver');
        $uri->setVar('task', 'login.' . $segments[2]);
        $uri->setVar('view', 'default');

        $uri->setPath('');
    }
}