forge/app/Http/Controllers/UserController.php

<?php

namespace App\Http\Controllers;

use App\Models\User;
use Illuminate\Foundation\Auth\Access\AuthorizesRequests;
use Illuminate\Http\Request;
use Illuminate\View\View;

class UserController extends Controller
{
    use AuthorizesRequests;

    public function show(Request $request, int $userId, string $username): View
    {
        $user = User::whereId($userId)
            ->firstOrFail();

        $mods = $user->mods()
            ->orderByDesc('created_at')
            ->paginate(10)
            ->fragment('mods');

        if ($user->slug() !== $username) {
            abort(404);
        }

        if ($request->user()?->cannot('view', $user)) {
            abort(403);
        }

        return view('user.show', compact('user', 'mods'));
    }
}