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图片验证码+session

生成随机验证码

#!/usr/bin/env python
# -*- coding:utf-8 -*-

import random
from PIL import Image, ImageDraw, ImageFont, ImageFilter

_letter_cases = "abcdefghjkmnpqrstuvwxy"  # 小写字母,去除可能干扰的i,l,o,z
_upper_cases = _letter_cases.upper()  # 大写字母
_numbers = ‘‘.join(map(str, range(3, 10)))  # 数字
init_chars = ‘‘.join((_letter_cases, _upper_cases, _numbers))


def create_validate_code(size=(120, 30),
                         chars=init_chars,
                         img_type="GIF",
                         mode="RGB",
                         bg_color=(255, 255, 255),
                         fg_color=(0, 0, 255),
                         font_size=18,
                         font_type="Monaco.ttf",
                         length=4,
                         draw_lines=True,
                         n_line=(1, 2),
                         draw_points=True,
                         point_chance=2):
    """
    @todo: 生成验证码图片
    @param size: 图片的大小,格式(宽,高),默认为(120, 30)
    @param chars: 允许的字符集合,格式字符串
    @param img_type: 图片保存的格式,默认为GIF,可选的为GIF,JPEG,TIFF,PNG
    @param mode: 图片模式,默认为RGB
    @param bg_color: 背景颜色,默认为白色
    @param fg_color: 前景色,验证码字符颜色,默认为蓝色#0000FF
    @param font_size: 验证码字体大小
    @param font_type: 验证码字体,默认为 ae_AlArabiya.ttf
    @param length: 验证码字符个数
    @param draw_lines: 是否划干扰线
    @param n_lines: 干扰线的条数范围,格式元组,默认为(1, 2),只有draw_lines为True时有效
    @param draw_points: 是否画干扰点
    @param point_chance: 干扰点出现的概率,大小范围[0, 100]
    @return: [0]: PIL Image实例
    @return: [1]: 验证码图片中的字符串
    """

    width, height = size  # 宽高
    # 创建图形
    img = Image.new(mode, size, bg_color)
    draw = ImageDraw.Draw(img)  # 创建画笔

    def get_chars():
        """生成给定长度的字符串,返回列表格式"""
        return random.sample(chars, length)

    def create_lines():
        """绘制干扰线"""
        line_num = random.randint(*n_line)  # 干扰线条数

        for i in range(line_num):
            # 起始点
            begin = (random.randint(0, size[0]), random.randint(0, size[1]))
            # 结束点
            end = (random.randint(0, size[0]), random.randint(0, size[1]))
            draw.line([begin, end], fill=(0, 0, 0))

    def create_points():
        """绘制干扰点"""
        chance = min(100, max(0, int(point_chance)))  # 大小限制在[0, 100]

        for w in range(width):
            for h in range(height):
                tmp = random.randint(0, 100)
                if tmp > 100 - chance:
                    draw.point((w, h), fill=(0, 0, 0))

    def create_strs():
        """绘制验证码字符"""
        c_chars = get_chars()
        strs =  %s  %  .join(c_chars)  # 每个字符前后以空格隔开

        font = ImageFont.truetype(font_type, font_size)
        font_width, font_height = font.getsize(strs)

        draw.text(((width - font_width) / 3, (height - font_height) / 3),
                  strs, font=font, fill=fg_color)

        return ‘‘.join(c_chars)

    if draw_lines:
        create_lines()
    if draw_points:
        create_points()
    strs = create_strs()

    # 图形扭曲参数
    params = [1 - float(random.randint(1, 2)) / 100,
              0,
              0,
              0,
              1 - float(random.randint(1, 10)) / 100,
              float(random.randint(1, 2)) / 500,
              0.001,
              float(random.randint(1, 2)) / 500
              ]
    img = img.transform(size, Image.PERSPECTIVE, params)  # 创建扭曲

    img = img.filter(ImageFilter.EDGE_ENHANCE_MORE)  # 滤镜,边界加强(阈值更大)

    return img, strs

应用到django项目中

整个验证码的流程如下 

  1. 用户访问登录页面,你的后台程序在给用户返回登录页面时,同时生成了验证码图片
  2. 用户输入账户信息和验证码数字,提交表单
  3. 后台判断用户输入的验证码和你生成的图片信息是否一致,如果一致,就代表验证码是没有问题的

登录页面

<!DOCTYPE html>
<html>
<head lang="en">
    <meta charset="UTF-8">
    <title></title>
    <link rel="stylesheet" href="/static/plugins/bootstrap/css/bootstrap.css"/>
    <link rel="stylesheet" href="/static/plugins/font-awesome/css/font-awesome.css"/>
    <link rel="stylesheet" href="/static/css/edmure.css"/>
    <link rel="stylesheet" href="/static/css/commons.css"/>
    <link rel="stylesheet" href="/static/css/account.css"/>
    <style>

    </style>
</head>
<body>
<div class="login">
    <div style="font-size: 25px; font-weight: bold;text-align: center;">
        用户登陆
    </div>
    <form role="form" action="/login.html" method="POST">
        {% csrf_token %}
        <div class="form-group">
            <label for="username">用户名</label>
            <input type="text" class="form-control" id="username" placeholder="请输入用户名">
        </div>
        <div class="form-group">
            <label for="password">密码</label>
            <input type="password"  class="form-control" id="password" placeholder="请输入密码">
        </div>
        <div class="form-group">
            <label for="password">验证码</label>

            <div class="row">
                <div class="col-xs-7">
                    <input type="text" name="check_code" class="form-control" id="password" placeholder="请输入验证码">
                </div>
                <div class="col-xs-5">
                    <img src="/check_code.html" onclick="changeCheckcode(this)">
                </div>
            </div>

        </div>
        <div class="checkbox">
            <label>
                <input type="checkbox"> 一个月内自动登陆
            </label>
            <div class="right">
                <a href="#">忘记密码?</a>
            </div>
        </div>
        <button type="submit" class="btn btn-default">登 陆</button>
    </form>
</div>
    <script>
        function changeCheckcode(ths){
            ths.src = ths.src + ?;
        }
    </script>
</body>
</html>

验证码通过html的img返回,绑定事件,点击验证码刷新图片

生成验证码views.py

from utils.check_code import create_validate_code

from io import BytesIO
def check_code(request):
    """
    验证码
    :param request:
    :return:
    """
    stream = BytesIO()
    img, code = create_validate_code()
    img.save(stream, PNG)
    request.session[CheckCode] = code
    return HttpResponse(stream.getvalue())

登录验证

def login(request):
    """
    登陆
    :param request:
    :return:
    """
    if request.method == "POST":
        print(request.session[CheckCode].upper())
        print(request.POST.get(check_code).upper())
        if request.session[CheckCode].upper() == request.POST.get(check_code).upper():
            print(ok)
        else:
            print(验证码错误)


    return render(request, login.html)

 

编辑框

http://www.cnblogs.com/wupeiqi/articles/6307554.html

 

图片验证码+session