如何为身份验证创建自定义django验证

from django.contrib.auth.backends import ModelBackend
from django.contrib.auth import get_user_model

User = get_user_model()

class CustomAuthBackend(ModelBackend):
    def authenticate(self, request, username=None, password=None, **kwargs):
        try:
            user = User.objects.get(username=username)
            if user.check_password(password):
                return user
        except User.DoesNotExist:
            return None

    def get_user(self, user_id):
        try:
            return User.objects.get(pk=user_id)
        except User.DoesNotExist:
            return None

AUTHENTICATION_BACKENDS = [
    'myapp.backends.CustomAuthBackend',
    'django.contrib.auth.backends.ModelBackend',
]

from django.contrib.auth import authenticate, login
from django.shortcuts import render, redirect

def login_view(request):
    if request.method == 'POST':
        username = request.POST['username']
        password = request.POST['password']
        user = authenticate(request, username=username, password=password)
        if user is not None:
            login(request, user)
            return redirect('home')
        else:
            return render(request, 'login.html', {'error': 'Invalid username or password'})
    else:
        return render(request, 'login.html')