验证码与session的应用
Posted amber-liu
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每个用户独一无二的验证码可以存储在session里,这样提交到登录视图函数,就会有一把钥匙,存储个人验证码,就可以在视图函数里进行验证了.
获取动态图片
def get_valid_img(request):
def get_random_color():
return (random.randint(0,255),random.randint(0,255),random.randint(0,255))
img=Image.new(‘RGB‘,(300,36),get_random_color())
draw=ImageDraw.Draw(img)
font=ImageFont.truetype(‘kumo.ttf‘,30)
verificaton_code = ‘‘
for i in range(6):
random_num=str(random.randint(0,9))
random_upper_alp=chr(random.randint(65,90))
random_lowwer_alp=chr(random.randint(97,122))
number=random.choice([random_num,random_lowwer_alp,random_upper_alp])
draw.text((i*30+50,0),number,get_random_color(),font)
verificaton_code+=number
print(verificaton_code)
# 划线
width=300
heigh=36
for i in range(6):
x1=random.randint(0,width)
y1=random.randint(0,heigh)
x2=random.randint(0,width)
y2=random.randint(0,heigh)
draw.line((x1,y1,x2,y2),get_random_color())
for i in range(10):
draw.point((random.randint(0,width),random.randint(0,heigh)),get_random_color())
x=random.randint(0,width)
y=random.randint(0,heigh)
draw.arc((x,y,x+5,y+5),0,100,get_random_color())
# 存在内存
f = BytesIO()
img.save(f, ‘png‘)
data = f.getvalue()
# 把验证码存在各自的session
request.session[‘verificaton_code‘]=verificaton_code
return HttpResponse(data)
登录视图函数
def login(request):
if request.is_ajax():
res={‘user‘:None,‘error_msg‘:None}
name=request.POST.get(‘name‘)
pwd=request.POST.get(‘pwd‘)
validcode=request.POST.get(‘validcode‘)
verification_code=request.session[‘verificaton_code‘]
if validcode.upper()==verification_code.upper():
obj=auth.authenticate(request,username=name,password=pwd)
if obj:
auth.login(request,obj)
res[‘user‘]=name
else:
res[‘error_msg‘]=‘用户名或密码错误‘
else:
res[‘error_msg‘]=‘验证码错误‘
return JsonResponse(res)
else:
return render(request,‘login.html‘)
login页面和ajax
<body>
<div class="container" style="margin-top: 60px">
<div class="row">
<div class="col-md-8 col-md-offset-2">
{% csrf_token %}
<div class="form-group">
<label for="name">用户名</label>
<input class="form-control" type="text" name="name" id="name">
</div>
<div class="form-group">
<label for="pwd">密码</label>
<input class="form-control" type="password" name="pwd" id="pwd">
</div>
<div class="form-group">
<label for="">验证码</label>
<div class="row">
<div class="col-md-6">
<input type="text" class="form-control" id="validcode">
</div>
<div class="col-md-6">
<img width="350" height="36" src="/get_valid_img/" id="img">
</div>
</div>
</div>
<span id="msg"></span>
<button class="btn btn-success pull-right" id="log_btn">登录</button>
</div>
</div>
</div>
</body>
<script>
$(function () {
$(‘#img‘).click(function () {
this.src+=‘?‘;
});
$(‘#log_btn‘).click(function () {
$.ajax({
url:‘‘,
type:‘post‘,
data:{
name:$(‘#name‘).val(),
pwd:$(‘#pwd‘).val(),
validcode:$(‘#validcode‘).val(),
csrfmiddlewaretoken:$(‘[name="csrfmiddlewaretoken"]‘).val()
},
success:function (res) {
if(res.user){
location.href=‘/index/‘
}else{
$(‘#msg‘).html(‘‘);
$(‘#msg‘).html(res.error_msg);
}
}
})
})
})
</script>
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