Composer.php

<?php

namespace App\Composers;

use Illuminate\Contracts\View\View;

interface Composer
{
    public function compose(View $view);

    /**
     * Get the view name the composer should be used for.
     *
     * @return string
     */
    public static function appliesTo() : string;
}

Composers.php

<?php

namespace App\Providers;

use Illuminate\Support\ServiceProvider;
use Illuminate\View\Factory;

class Composers extends ServiceProvider
{
    /** @var \App\Composers\Composer[] */
    private $composers = [
        \App\Composers\Pages\Home::class,
        \App\Composers\Pages\Vendors\Index::class,
        \App\Composers\Pages\Vendor\Show::class,
    ];

    public function register()
    {
        $this->registerComposers($this->app['view']);
    }

    private function registerComposers(Factory $view)
    {
        foreach ($this->composers as $composer) {
            $view->composer($composer::appliesTo(), $composer);
        }
    }
}

Home.php

<?php

namespace App\Composers\Pages;

use App\Composers\Composer;
use App\Http\Kernel;
use Illuminate\Contracts\Auth\Guard;
use Illuminate\Contracts\View\View;
use Illuminate\Contracts\Routing\UrlGenerator;

class Home implements Composer
{
    /** @var Guard $guard */
    private $guard;

    /** @var UrlGenerator $urlGenerator */
    private $urlGenerator;

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

    public function compose(View $view)
    {
        $view
            ->with('loginUrl', $this->urlGenerator->route('login.show'))
            ->with('logoutUrl', $this->urlGenerator->route('logout'))
            ->with('user', $this->guard->user());
    }

    public static function appliesTo() : string
    {
        return 'pages.home';
    }
}