Django之验证码

  1 #!/usr/bin/env python
  2 # -*- coding:utf-8 -*-
  3 
  4 import random
  5 from PIL import Image, ImageDraw, ImageFont, ImageFilter
  6 
  7 _letter_cases = "abcdefghjkmnpqrstuvwxy"  # 小写字母，去除可能干扰的i，l，o，z
  8 _upper_cases = _letter_cases.upper()  # 大写字母
  9 _numbers = ''.join(map(str, range(3, 10)))  # 数字
 10 init_chars = ''.join((_letter_cases, _upper_cases, _numbers))
 11 
 12 
 13 def create_validate_code(size=(120, 30),
 14                          chars=init_chars,
 15                          img_type="GIF",
 16                          mode="RGB",
 17                          bg_color=(255, 255, 255),
 18                          fg_color=(0, 0, 255),
 19                          font_size=18,
 20                          font_type="Monaco.ttf",
 21                          length=4,
 22                          draw_lines=True,
 23                          n_line=(1, 2),
 24                          draw_points=True,
 25                          point_chance=2):
 26     """
 27     @todo: 生成验证码图片
 28     @param size: 图片的大小，格式（宽，高），默认为(120, 30)
 29     @param chars: 允许的字符集合，格式字符串
 30     @param img_type: 图片保存的格式，默认为GIF，可选的为GIF，JPEG，TIFF，PNG
 31     @param mode: 图片模式，默认为RGB
 32     @param bg_color: 背景颜色，默认为白色
 33     @param fg_color: 前景色，验证码字符颜色，默认为蓝色#0000FF
 34     @param font_size: 验证码字体大小
 35     @param font_type: 验证码字体，默认为 ae_AlArabiya.ttf
 36     @param length: 验证码字符个数
 37     @param draw_lines: 是否划干扰线
 38     @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
 39     @param draw_points: 是否画干扰点
 40     @param point_chance: 干扰点出现的概率，大小范围[0, 100]
 41     @return: [0]: PIL Image实例
 42     @return: [1]: 验证码图片中的字符串
 43     """
 44 
 45     width, height = size  # 宽高
 46     # 创建图形
 47     img = Image.new(mode, size, bg_color)
 48     draw = ImageDraw.Draw(img)  # 创建画笔
 49 
 50     def get_chars():
 51         """生成给定长度的字符串，返回列表格式"""
 52         return random.sample(chars, length)
 53 
 54     def create_lines():
 55         """绘制干扰线"""
 56         line_num = random.randint(*n_line)  # 干扰线条数
 57 
 58         for i in range(line_num):
 59             # 起始点
 60             begin = (random.randint(0, size[0]), random.randint(0, size[1]))
 61             # 结束点
 62             end = (random.randint(0, size[0]), random.randint(0, size[1]))
 63             draw.line([begin, end], fill=(0, 0, 0))
 64 
 65     def create_points():
 66         """绘制干扰点"""
 67         chance = min(100, max(0, int(point_chance)))  # 大小限制在[0, 100]
 68 
 69         for w in range(width):
 70             for h in range(height):
 71                 tmp = random.randint(0, 100)
 72                 if tmp > 100 - chance:
 73                     draw.point((w, h), fill=(0, 0, 0))
 74 
 75     def create_strs():
 76         """绘制验证码字符"""
 77         c_chars = get_chars()
 78         strs = ' %s ' % ' '.join(c_chars)  # 每个字符前后以空格隔开
 79 
 80         font = ImageFont.truetype(font_type, font_size)
 81         font_width, font_height = font.getsize(strs)
 82 
 83         draw.text(((width - font_width) / 3, (height - font_height) / 3),
 84                   strs, font=font, fill=fg_color)
 85 
 86         return ''.join(c_chars)
 87 
 88     if draw_lines:
 89         create_lines()
 90     if draw_points:
 91         create_points()
 92     strs = create_strs()
 93 
 94     # 图形扭曲参数
 95     params = [1 - float(random.randint(1, 2)) / 100,
 96               0,
 97               0,
 98               0,
 99               1 - float(random.randint(1, 10)) / 100,
100               float(random.randint(1, 2)) / 500,
101               0.001,
102               float(random.randint(1, 2)) / 500
103               ]
104     img = img.transform(size, Image.PERSPECTIVE, params)  # 创建扭曲
105 
106     img = img.filter(ImageFilter.EDGE_ENHANCE_MORE)  # 滤镜，边界加强（阈值更大）
107 
108     return img, strs

 

视图函数：

 1 from app03.views.check_code import create_validate_code
 2 from io import BytesIO
 3 
 4 
 5 def check_code(request):
 6     stream = BytesIO()
 7     img, code = create_validate_code()
 8     img.save(stream, 'PNG')
 9     request.session['CheckCode'] = code
10     return HttpResponse(stream.getvalue())
11 
12 def login(request):
13     """
14     登陆
15     :param request:
16     :return:
17     """
18     # if request.method == "POST":
19     #     if request.session['CheckCode'].upper() == request.POST.get('check_code').upper():
20     #         pass
21     #     else:
22     #         print('验证码错误')
23     if request.method == 'POST':
24         code = request.POST.get('check_code')
25         if code.upper() == request.session['CheckCode'].upper():
26             print('验证码正确')
27         else:
28             print('验证码错误')
29     return render(request, 'login.html')

 

 1 <div class="col-xs-7">
 2     <input type="text" class="form-control" placeholder="请输入验证码" name="check_code">
 3 </div>
 4 <div class="col-xs-5">
 5     <h1 style="color: pink">验证码</h1>
 6     <img src="/app03/check_code.html" onclick="changeCheckCode(this);">
 7 </div>
 8 
 9 <script>
10     function changeCheckCode(ths){
11         ths.src = ths.src +  '?';
12     }
13 </script>

 

字体文件

 

滑动验证码：

1、打开插件，找到自己需要的验证码

2、筛选有用的路径

3、把对应的视图函数也拿过来,注意还需要一个geetest.py的文件

1 #滑动验证码
2      url(r'^pc-geetest/register', pcgetcaptcha, name='pcgetcaptcha'),
3      url(r'^pc-geetest/ajax_validate', pcajax_validate, name='pcajax_validate'),

urls