Django 登陆验证码和中间件的实现

def verifycode(request):  #引入绘图模块  from PIL import Image, ImageDraw, ImageFont  #引入随机函数模块  import random  #定义变量，用于画面的背景色、宽、高  bgcolor = (random.randrange(20, 100), random.randrange(    20, 100), random.randrange(20, 100))  width = 100  height = 50  #创建画面对象  im = Image.new('RGB', (width, height), bgcolor)  #创建画笔对象  draw = ImageDraw.Draw(im)  #调用画笔的point()函数绘制噪点  for i in range(0, 100):    xy = (random.randrange(0, width), random.randrange(0, height))    fill = (random.randrange(0, 255), 255, random.randrange(0, 255))    draw.point(xy, fill=fill)  #定义验证码的备选值  str = '1234567890QWERTYUIOPASDFGHJKLZXCVBNMqwertyuiopasdfghjklzxcvbnm'  #随机选取4个值作为验证码  rand_str = ''  for i in range(0, 4):    rand_str += str[random.randrange(0, len(str))]  #构造字体对象  font = ImageFont.truetype(r'C:/Windows/Fonts/AdobeArabic-Bold.otf', 40)  #构造字体颜色  fontcolor1 = (255, random.randrange(0, 255), random.randrange(0, 255))  fontcolor2 = (255, random.randrange(0, 255), random.randrange(0, 255))  fontcolor3 = (255, random.randrange(0, 255), random.randrange(0, 255))  fontcolor4 = (255, random.randrange(0, 255), random.randrange(0, 255))  #绘制4个字  draw.text((5, 2), rand_str[0], font=font, fill=fontcolor1)  draw.text((25, 2), rand_str[1], font=font, fill=fontcolor2)  draw.text((50, 2), rand_str[2], font=font, fill=fontcolor3)  draw.text((75, 2), rand_str[3], font=font, fill=fontcolor4)  #释放画笔  del draw  #内存文件操作  import io  buf = io.BytesIO()  #将图片保存在内存中，文件类型为png  im.save(buf, 'png')  #将内存中的图片数据返回给客户端，MIME类型为图片png  response = HttpResponse(buf.getvalue(), 'image/png')  #将验证码的值写入cookie，以被前端浏览器验证验证码  # response.set_cookie("verifycode", rand_str)  # 存入session，用于做进一步验证  request.session['verifycode'] = rand_str  return response

def login(request):  if request.method == "GET":    infoStr = "<h1>sunck is a good man</h1>"    # infoStr = "<script>alert('sunck good')</script>"    return render(request, "login.html", {"infoStr":infoStr})  else:    #判断验证码    verifycode = request.POST.get("verifycode")    if not verifycode.upper() == request.session.get("verifycode").upper():      return redirect("/login/")    username = request.POST.get("username")    password = request.POST.get("password")    if username == "sunck" and password == "sunck1999":      return redirect("/index/")    else:      return redirect("/login/")

from django.utils.deprecation import MiddlewareMixinfrom django.shortcuts import redirectclass VerifycodeMiddleware(MiddlewareMixin):  def process_request(self, request):    print("***************", request.path)    if request.path == "/login/" and request.method == "POST":      # 判断验证码      verifycode = request.POST.get("verifycode")      if not verifycode.upper() == request.session.get("verifycode").upper():        return redirect("/login/")

'myApp.middlewares.verifycodeMiddleware.VerifycodeMiddleware'