Laravel: How to set globally available default route parameters

Not sure why this is getting attention almost a year later, but I ended up finding a solution by myself.

To add a bit more information to the original question, the purpose of this was to allow us to have the same instance of the code powering both our live and sandbox application. There's more involved to get this working, but this issue was just about URL generation for links in views. All links generated always both a subdomain and tld, so this code injects these values always.

These views are rendered both as a response to a HTTP request, e.g. in our client areas, but also as part of a non HTTP request, e.g. a scheduled task generating invoices and emailing them to clients.

Anyway, the solution:

For non HTTP contexts, a service provider can set the defaults:

<?php namespace App\Providers;

use App\Support\UrlDefaults;
use Illuminate\Routing\UrlGenerator;
use Illuminate\Support\ServiceProvider;

class UrlDefaultsServiceProvider extends ServiceProvider
{
    public function boot(UrlGenerator $urlGenerator): void
    {
        $urlGenerator->defaults(UrlDefaults::getDefaults());
    }
}

Since the there's no routing going on to cause the problem I asked originally, this just works.

For HTTP contexts, the RouteMatched event is listened for and the defaults injected then:

<?php namespace App\Listeners;
use App\Support\UrlDefaults;
use Illuminate\Routing\Router;
use Illuminate\Routing\UrlGenerator;

/**
 * Class SetUrlDefaults
 *
 * This class listeners for the RouteMatched event, and when it fires, injects the route paramaters (subdomain, tld,
 * etc) into the defaults of the UrlGenerator
 *
 * @package App\Listeners
 */
class SetUrlDefaults
{
    private $urlGenerator;
    private $router;

    public function __construct(UrlGenerator $urlGenerator, Router $router)
    {
        $this->urlGenerator = $urlGenerator;
        $this->router       = $router;
    }

    public function handle(): void
    {
        $paramaters = array_merge(UrlDefaults::getDefaults(), $this->router->current()->parameters);
        $this->urlGenerator->defaults($paramaters);
    }
}

UrlDefaults is just a simple class that returns an array:

<?php namespace App\Support;

class UrlDefaults
{
    public static function getDefaults(): array
    {
        return [
            'tld' => config('app.url.tld'),
            'api' => config('app.url.api'),
            'foo' => config('app.url.foo'),
            'bar' => config('app.url.bar'),
        ];
    }
}