如何自定义Laravel的用户认证逻辑？

// app/Http/Controllers/Auth/LoginController.php

namespace App\Http\Controllers\Auth;

use Illuminate\Http\Request;
use App\Http\Controllers\Controller;
use Illuminate\Support\Facades\Auth;

class LoginController extends Controller
{
    public function login(Request $request)
    {
        $credentials = $request->only(['email', 'password']);

        if (Auth::attempt($credentials)) {
            $user = Auth::user();
            if ($user->email_verified_at) {
                return redirect()->intended('dashboard');
            } else {
                Auth::logout();
                return redirect()->back()->withErrors(['email' => 'Please verify your email first.']);
            }
        }

        return redirect()->back()->withErrors(['email' => 'These credentials do not match our records.']);
    }
}

// app/Providers/AuthServiceProvider.php

namespace App\Providers;

use Illuminate\Foundation\Support\Providers\AuthServiceProvider as ServiceProvider;
use Illuminate\Support\Facades\Auth;

class AuthServiceProvider extends ServiceProvider
{
    protected $policies = [
        // Your policies here
    ];

    public function boot()
    {
        $this->registerPolicies();

        Auth::extend('custom', function ($app, $name, array $config) {
            // Return an implementation of Illuminate\Contracts\Auth\Guard
            return new \App\Auth\CustomGuard(Auth::createUserProvider($config['provider']));
        });
    }
}

// app/Auth/CustomGuard.php

namespace App\Auth;

use Illuminate\Contracts\Auth\Guard;
use Illuminate\Contracts\Auth\UserProvider;
use Illuminate\Http\Request;

class CustomGuard implements Guard
{
    protected $request;
    protected $provider;

    public function __construct(UserProvider $provider, Request $request)
    {
        $this->request = $request;
        $this->provider = $provider;
    }

    public function check()
    {
        // Check if the user is authenticated
        return ! is_null($this->user());
    }

    public function guest()
    {
        return ! $this->check();
    }

    public function user()
    {
        // Retrieve the user from the session or any other storage
        // This is a simplified example
        $id = $this->request->session()->get('user_id');
        return $this->provider->retrieveById($id);
    }

    public function id()
    {
        $user = $this->user();
        return $user ? $user->getAuthIdentifier() : null;
    }

    public function validate(array $credentials = [])
    {
        // Validate the user credentials
        $user = $this->provider->retrieveByCredentials($credentials);
        return $this->hasher->check($credentials['password'], $user->getAuthPassword());
    }

    public function setUser($user)
    {
        // Set the user in the session or any other storage
        $this->request->session()->put('user_id', $user->getAuthIdentifier());
    }
}