class SimpleMiddleware:
    def __init__(self, get_response):
        self.get_response = get_response
    def __call__(self, request):
        # 在視圖函數(shù)之前執(zhí)行的代碼
        response = self.get_response(request)
        # 在視圖函數(shù)之后執(zhí)行的代碼
        response['X-Custom-Header'] = 'Custom Value'
        return response

MIDDLEWARE = [
    ...
    'django.middleware.security.SecurityMiddleware',
    'django.contrib.sessions.middleware.SessionMiddleware',
    'django.middleware.common.CommonMiddleware',
    'django.middleware.csrf.CsrfViewMiddleware',
    'django.contrib.auth.middleware.AuthenticationMiddleware',
    'django.contrib.messages.middleware.MessageMiddleware',
    'django.middleware.clickjacking.XFrameOptionsMiddleware',
    'myapp.middleware.SimpleMiddleware',  # 添加你的中間件
    ...
]

class IPFilterMiddleware:
    def __init__(self, get_response):
        self.get_response = get_response
    def __call__(self, request):
        # 定義允許的IP地址列表
        allowed_ips = ['192.168.1.1', '127.0.0.1']
        # 獲取請(qǐng)求的IP地址
        x_forwarded_for = request.META.get('HTTP_X_FORWARDED_FOR')
        if x_forwarded_for:
            ip = x_forwarded_for.split(',')[0]
        else:
            ip = request.META.get('REMOTE_ADDR')
        # 檢查IP是否在允許的列表中
        if ip not in allowed_ips:
            # 如果不在允許的列表中，返回403禁止訪問
            from django.http import HttpResponseForbidden
            return HttpResponseForbidden("You are not allowed to access this site.")
        # 繼續(xù)處理請(qǐng)求
        response = self.get_response(request)
        return response

import datetime
class LoggingMiddleware:
    def __init__(self, get_response):
        self.get_response = get_response
    def __call__(self, request):
        # 請(qǐng)求到達(dá)的時(shí)間
        start_time = datetime.datetime.now()
        # 處理請(qǐng)求
        response = self.get_response(request)
        # 請(qǐng)求結(jié)束的時(shí)間
        end_time = datetime.datetime.now()
        # 記錄日志
        logger = logging.getLogger(__name__)
        logger.info(
            f'Status Code: {response.status_code} '
            f'| Method: {request.method} '
            f'| Path: {request.path} '
            f'| Time: {(end_time - start_time).total_seconds()}s'
        )
        return response

MIDDLEWARE = [
    ...
    'django.middleware.security.SecurityMiddleware',
    'django.contrib.sessions.middleware.SessionMiddleware',
    'django.middleware.common.CommonMiddleware',
    'django.middleware.csrf.CsrfViewMiddleware',
    'django.contrib.auth.middleware.AuthenticationMiddleware',
    'django.contrib.messages.middleware.MessageMiddleware',
    'django.middleware.clickjacking.XFrameOptionsMiddleware',
    'myapp.middleware.IPFilterMiddleware',  # 添加IP過濾中間件
    'myapp.middleware.LoggingMiddleware',  # 添加日志記錄中間件
    ...
]