system: You are an expert security code reviewer. You will be shown a source code file along with a multiple-choice question listing several function or class names from that file. Your task is to identify which one contains the specified CWE vulnerability.

OUTPUT FORMAT: Respond with the single letter of the correct option, wrapped in \boxed{...}. Example: `\boxed{B}`. Output the boxed letter ONLY -- no explanation, no other text.

user: ```python
import re

from django.db import DatabaseError
from django.http import HttpResponseBadRequest, HttpResponse, JsonResponse
from django.shortcuts import render
import logging
from django.shortcuts import redirect
from django.urls import reverse
from django.contrib.auth.mixins import LoginRequiredMixin

# Create your views here.

# 注册视图
from django.views import View
from django_redis import get_redis_connection

from libs.captcha.captcha import captcha
from users.models import User
from utils.response_code import RETCODE
from django.contrib.auth import logout
from home.models import ArticleCategory, Article

logger=logging.getLogger('django')



class ImageCodeView(View):

    def get(self, request):
        '''
        1.接收前端传递过来的uuid
        2.判断uid是否获取到
        3.通过调用captcha 来生成图片验证码（图片二进制和图片内容）
        4将图片内容保存到redis中
        uuid作为一个key，图片内容作为一个value同时我们还需要设置一个实效
        5.返回图片二进制
        '''

        # 获取前端传递过来的参数
        uuid = request.GET.get('uuid')
        # 判断参数是否为None
        if uuid is None:
            return HttpResponseBadRequest('请求参数错误')
        # 获取验证码内容和验证码图片二进制数据
        text, image = captcha.generate_captcha()
        # 将图片验内容保存到redis中，并设置过期时间
        redis_conn = get_redis_connection('default')
        # key 设置为uuid
        # seconds 过期秒数300秒5分钟过期时间
        # value text
        redis_conn.setex('img:%s' % uuid, 300, text)
        # 返回响应，将生成的图片以content_type为image/jpeg的形式返回给请求
        return HttpResponse(image, content_type='image/jpeg')

class RegisterView(View):

    def get(self, request):

        return render(request, 'register.html')

    def post(self, request):
        #
        # 1.接收数据
        mobile = request.POST.get('mobile')
        password = request.POST.get('password')
        password2 = request.POST.get('password2')

        # image_code_client = request.GET.get('image_code')
        # uuid = request.GET.get('uuid')



        # 2.验证数据
        #     2.1参数是否齐全
        # 校验参数
        if not all([mobile,password,password2]):
            return JsonResponse({'code': RETCODE.NECESSARYPARAMERR, 'errmsg': '缺少必传参数'})


        #     2.2手机号的格式是否正确
        if not re.match(r'^1[3-9]\d{9}$',mobile):
            return HttpResponseBadRequest('请输入正确的手机号')

        #     2.3密码是否符合格式
        if not re.match(r'^[0-9a-zA-Z]{8,20}$',password):
            return HttpResponseBadRequest('请输入8-20位密码')

        #     2.4密码和确认密码要一致
        if password != password2:
            return HttpResponseBadRequest('两次密码输入不一致')

        # #     2.5图片验证码是否和redis中的一致
        # # 创建连接到redis的对象
        # redis_conn = get_redis_connection('default')
        # # 提取图形验证码
        # image_code_server = redis_conn.get('img:%s' % uuid)
        # if image_code_server is None:
        #     # 图形验证码过期或者不存在
        #     return JsonResponse({'code': RETCODE.IMAGECODEERR, 'errmsg': '图形验证码失效'})
        # # 删除图形验证码，避免恶意测试图形验证码
        # try:
        #     redis_conn.delete('img:%s' % uuid)
        # except Exception as e:
        #     logger.error(e)
        # # 对比图形验证码
        # image_code_server = image_code_server.decode()  # bytes转字符串
        # if image_code_client.lower() != image_code_server.lower():  # 转小写后比较
        #     return JsonResponse({'code': RETCODE.IMAGECODEERR, 'errmsg': '输入图形验证码有误'})

        # 3.保存法册信息
        # create_user 使用系统的方法对密码进行加密
        try:
            user = User.objects.create_user(username=mobile,
                                            mobile = mobile,
                                            password=password)
        except  DatabaseError as e:
            logger.error(e)
            return HttpResponseBadRequest('注册失败')

        from django.contrib.auth import login
        login(request, user)

        # 4.返回响应跳转到指定页面
        # redirect 是进行重定向
        # reverse是可以通过namespace:name 来获取到视图所对应的路由
        response =  redirect(reverse('home:index'))
        # return HttpResponse('注册成功，跳转至首页（未实现）')

        # 设置cookie信息，以方便首页中用户信息展示的判断和用户信息的展示
        response.set_cookie('is_login', True)
        response.set_cookie('username', user.username, max_age= 7*24*3600)

        return response

class SmsCodeView(View):

    def get(self,request):
        # 接收参数
        image_code_client = request.GET.get('image_code')
        uuid = request.GET.get('uuid')
        mobile=request.GET.get('mobile')

        # 校验参数
        if not all([image_code_client, uuid,mobile]):
            return JsonResponse({'code': RETCODE.NECESSARYPARAMERR, 'errmsg': '缺少必传参数'})

        # 创建连接到redis的对象
        redis_conn = get_redis_connection('default')
        # 提取图形验证码
        image_code_server = redis_conn.get('img:%s' % uuid)
        if image_code_server is None:
            # 图形验证码过期或者不存在
            return JsonResponse({'code': RETCODE.IMAGECODEERR, 'errmsg': '图形验证码失效'})
        # 删除图形验证码，避免恶意测试图形验证码
        try:
            redis_conn.delete('img:%s' % uuid)
        except Exception as e:
            logger.error(e)
        # 对比图形验证码
        image_code_server = image_code_server.decode()  # bytes转字符串
        if image_code_client.lower() != image_code_server.lower():  # 转小写后比较
            return JsonResponse({'code': RETCODE.IMAGECODEERR, 'errmsg': '输入图形验证码有误'})

        return JsonResponse({'code': RETCODE.OK, 'errmsg': '发送短信成功'})

class LoginView(View):
    def get(self, request):

        return render(request, 'login.html')

    def post(self, request):

        # 1.接收参数
        mobile = request.POST.get('mobile')
        password = request.POST.get('password')
        remember = request.POST.get('remember')

        # 2.校验参数
        # 判断参数是否齐全
        if not all([mobile, password]):
            return HttpResponseBadRequest('缺少必传参数')

        # 判断手机号是否正确
        if not re.match(r'^1[3-9]\d{9}$', mobile):
            return HttpResponseBadRequest('请输入正确的手机号')

        # 判断密码是否是8-20个数字
        if not re.match(r'^[0-9A-Za-z]{8,20}$', password):
            return HttpResponseBadRequest('密码最少8位，最长20位')

        # 3.用户认证登录
        # 采用系统自带的认证方法进行认证
        # 如果我们的用户名和密码正确，会返user
        # 如果我们的用户名或密码不正确，会返回None
        from django.contrib.auth import authenticate,login
        # 新认的认证方法是针对于username字段进行用户名的判断
        # 当前的判断信息是手机号，所以我们需要修改一下认证字段
        # 我们需要到User模型中进行修改，等测试出现问题的时候，我们再修改
        user = authenticate(mobile=mobile, password=password)
        if user is None:
            return HttpResponseBadRequest('用户名或者密码错误')

        # 4.状态的保持
        login(user=user,request=request)

        # 根据next参数来进行页面的跳转选择，默认跳转首页
        next_page = request.GET.get('next')
        if next_page:
            response = redirect(next_page)
        else:
            response = redirect(reverse('home:index'))
        # 5.根据用户选择的是否记住登录状态来进行判断
        # 6.为了首页显示我们需要设置一些cookie信息
        if remember != 'on':  # 无记住
            # 浏览器关闭之后
            request.session.set_expiry(0)
            response.set_cookie('is_login', True)
            response.set_cookie('username', user.username, max_age=14 * 24 * 3600)
        else:
            # 默认记住两周
            request.session.set_expiry(None)
            response.set_cookie('is_login', True,max_age=14 * 24 * 3600)
            response.set_cookie('username', user.username, max_age=14 * 24 * 3600)


        # 7.返回响应
        return response

class LogoutView(View):

    def get(self,request):
        # 1.seession的删除
        logout(request)

        # 2.删除部分session数据
        # response = redirect(reverse('home:index'))
        response = render(request, 'index.html')
        response.delete_cookie('is_login')

        # 3.跳转到首页
        return response

class ForgetPasswordView(View):

    def get(self, request):

        return render(request, 'forget_password.html')

    def post(self, request):
        # 接收参数
        mobile = request.POST.get('mobile')
        password = request.POST.get('password')
        password2 = request.POST.get('password2')
        # smscode = request.POST.get('sms_code')

        # 判断参数是否齐全
        if not all([mobile, password, password2]):
            return HttpResponseBadRequest('缺少必传参数')

        # 判断手机号是否合法
        if not re.match(r'^1[3-9]\d{9}$', mobile):
            return HttpResponseBadRequest('请输入正确的手机号码')

        # 判断密码是否是8-20个数字
        if not re.match(r'^[0-9A-Za-z]{8,20}$', password):
            return HttpResponseBadRequest('请输入8-20位的密码')

        # 判断两次密码是否一致
        if password != password2:
            return HttpResponseBadRequest('两次输入的密码不一致')

        # 验证短信验证码
        # redis_conn = get_redis_connection('default')
        # sms_code_server = redis_conn.get('sms:%s' % mobile)
        # if sms_code_server is None:
        #     return HttpResponseBadRequest('短信验证码已过期')
        # if smscode != sms_code_server.decode():
        #     return HttpResponseBadRequest('短信验证码错误')

        # 根据手机号查询数据
        try:
            user = User.objects.get(mobile=mobile)
        except User.DoesNotExist:
            # 如果该手机号不存在，则注册个新用户
            try:
                User.objects.create_user(username=mobile, mobile=mobile,
                                         password=password)
            except Exception:
                return HttpResponseBadRequest('修改失败，请稍后再试')
        else:
            # 修改用户密码
            user.set_password(password)
            user.save()

        # 跳转到登录页面
        response = redirect(reverse('users:login'))

        return response



class UserCenterView(LoginRequiredMixin, View):
    # LoginRequiredMixin
    # 如果用户未登录的话，则会进行默认的跳转
    # 默认认的跳转连接是：accounts/login/?next=xxx
    # 所以得去修改系统的默认跳转路由，在setting 添加 LOGIN_URL = '/login/'
    def get(self,request):
        # 获取用户信息
        user = request.user

        # 组织模板渲染数据
        context = {
            'username': user.username,
            'mobile': user.mobile,
            'avatar': user.avatar if user.avatar else None,
            'user_desc': user.user_desc
        }

        return render(request, 'center.html', context=context)

    def post(self, request):
        # 接收数据
        user = request.user
        avatar = request.FILES.get('avatar')
        username = request.POST.get('username', user.username)
        user_desc = request.POST.get('desc', user.user_desc)

        # 修改数据库数据
        try:
            user.username = username
            user.user_desc = user_desc
            if avatar: # 同时需要设置图片上传位置 setting中设置 MEDIA_ROOT = os.path.join(BASE_DIR, 'media/')
                user.avatar = avatar
            user.save()
        except Exception as e:
            logger.error(e)
            return HttpResponseBadRequest('更新失败，请稍后再试')

        # 返回响应，刷新页面
        response = redirect(reverse('users:center'))
        # 更新cookie信息
        response.set_cookie('username', user.username, max_age=14 * 24 * 3600)
        return response


class WriteBlogView(LoginRequiredMixin,View):

    def get(self,request):

        # 查询所有分类模型
        categories = ArticleCategory.objects.all()

        context = {
            'categories':categories
        }

        return render(request,'write_blog.html', context=context)

    def post(self,request):

        # 接收数据
        avatar = request.FILES.get('avatar')
        title = request.POST.get('title')
        category_id = request.POST.get('category')
        tags = request.POST.get('tags')
        sumary = request.POST.get('sumary')
        content = request.POST.get('content')
        user = request.user

        # 验证数据
        # 验证数据是否齐全
        if not all([avatar, title, category_id, sumary, content]):
            return HttpResponseBadRequest('参数不全')

        # 判断分类id
        try:
            category = ArticleCategory.objects.get(id = category_id)
        except ArticleCategory.DoesNotExist:
            return HttpResponseBadRequest('没有此分类')

        # 数据入库
        try:
            article = Article.objects.create(
                author=user,
                avatar=avatar,
                category=category,
                tags=tags,
                title=title,
                sumary=sumary,
                content=content
            )
        except Exception as e:
            logger.error(e)
            return HttpResponseBadRequest('发布失败，请稍后再试')


        # 页面跳转
        # 返回响应，跳转到文章详情页面
        # 暂时先跳转到首页
        return redirect(reverse('home:index'))
        pass
```

Which of the following functions or classes contains a `CWE-601: URL Redirection to Untrusted Site ('Open Redirect')` vulnerability?

  A) SmsCodeView
  B) get
  C) post
  D) ImageCodeView
Answer: C