04 第三方之验证码封装
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安装模块
1 pip install flask 2 pip install pillow
代码块
1 from flask import Flask,make_response 2 import random 3 import string 4 from io import BytesIO 5 app = Flask(__name__) 6 7 from PIL import Image, ImageDraw, ImageFont 8 9 10 class Captcha: 11 # 生成的验证码的个数 12 number = 4 13 # 图片的宽度和高度 14 size = (80, 30) 15 # 字体大小 16 fontsize = 25 17 # 干扰线条数 18 line_number = 2 19 20 SOURCE = list(string.ascii_letters) 21 SOURCE.extend(map(str, list(range(0, 10)))) 22 23 @classmethod 24 def __gen_line(cls, draw, width, height): 25 """ 26 绘制干扰线 27 """ 28 begin = (random.randint(0, width), random.randint(0, height)) 29 end = (random.randint(0, width), random.randint(0, height)) 30 draw.line([begin, end], fill=cls.__gen_random_color(), width=2) 31 32 @classmethod 33 def __gen_random_color(cls, start=0, end=255): 34 """ 35 产生随机颜色 36 颜色的取值范围是0~255 37 """ 38 random.seed() 39 return ( 40 random.randint(start, end), 41 random.randint(start, end), 42 random.randint(start, end), 43 ) 44 45 @classmethod 46 def __gen_points(cls, draw, point_chance, width, height): 47 """ 48 绘制干扰点 49 """ 50 chance = min(100, max(0, int(point_chance))) 51 for w in range(width): 52 for h in range(height): 53 temp = random.randint(0, 100) 54 if temp > 100 - chance: 55 draw.point((w, h), fill=cls.__gen_random_color()) 56 57 @classmethod 58 def __gen_random_font(cls): 59 """ 60 采用随机字体 61 :return: 62 """ 63 fonts = ["consola.ttf", "consolab.ttf", "consolai.ttf"] 64 font = random.choice(fonts) 65 return "utils/captcha/" + font 66 67 @classmethod 68 def gen_text(cls, number): 69 """ 70 随机生成一个字符串 71 :param number: 字符串数量 72 """ 73 return "".join(random.sample(cls.SOURCE, number)) 74 75 @classmethod 76 def gen_graph_captcha(cls): 77 width, height = cls.size 78 # A表示透明度 79 image = Image.new("RGBA", (width, height), cls.__gen_random_color(0, 100)) 80 # 字体 81 font = ImageFont.truetype(cls.__gen_random_font(), cls.fontsize) 82 # 创建画笔 83 draw = ImageDraw.Draw(image) 84 # 生成随机字符串 85 text = cls.gen_text(cls.number) 86 # 字体大小 87 font_width, font_height = font.getsize(text) 88 # 填充字符串 89 draw.text( 90 ((width - font_width) / 2, (height - font_height) / 2), 91 text, 92 font=font, 93 fill=cls.__gen_random_color(150, 255), 94 ) 95 # 绘制干扰线 96 for x in range(0, cls.line_number): 97 cls.__gen_line(draw, width, height) 98 # 绘制噪点 99 cls.__gen_points(draw, 10, width, height) 100 101 return text, image 102 103 104 @app.route(‘/captcha/‘) 105 def graph_captcha(): 106 text, image = Captcha.gen_graph_captcha() 107 out = BytesIO() 108 image.save(out, ‘png‘) 109 out.seek(0) 110 resp = make_response(out.read()) 111 resp.content_type = ‘image/png‘ 112 return resp 113 114 115 if __name__ == ‘__main__‘: 116 app.run()
验证码图样
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