pillow 实现验证码实现

pillow 实现验证码实现

验证码实现和验证逻辑

1, 验证码实现

import random
import string
# Image：一个画布
# ImageDraw：一个画笔
# ImageFont:画笔的字体
from PIL import Image,ImageDraw,ImageFont
# pip install pillow# Captcha验证码
class Captcha(object):# 生成几位数的验证码number = 4# 验证码图片的宽度和高度size = (100,30)# 验证码字体大小fontsize = 25# 加入干扰线的条数line_number = 2# 构建一个验证码源文本SOURCE = list(string.ascii_letters)for index in range(0, 10):SOURCE.append(str(index))#用来绘制干扰线@classmethoddef __gene_line(cls,draw,width,height):begin = (random.randint(0, width), random.randint(0, height))end = (random.randint(0, width), random.randint(0, height))draw.line([begin, end], fill = cls.__gene_random_color(),width=2)# 用来绘制干扰点@classmethoddef __gene_points(cls,draw,point_chance,width,height):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=cls.__gene_random_color())# 生成随机的颜色@classmethoddef __gene_random_color(cls,start=0,end=255):random.seed()return (random.randint(start,end),random.randint(start,end),random.randint(start,end))# 随机选择一个字体@classmethoddef __gene_random_font(cls):fonts = ['utils/captcha/'+font for font in [&#f',&#f',&#f',]]font = random.choice(fonts)return font# 用来随机生成一个字符串(包括英文和数字)@classmethoddef gene_text(cls, number):# number是生成验证码的位数return ''.join(random.sample(cls.SOURCE, number))#生成验证码@classmethoddef gene_graph_captcha(cls):# 验证码图片的宽和高width,height = cls.size# 创建图片# R：Red（红色）0-255# G：G（绿色）0-255# B：B（蓝色）0-255# A：Alpha（透明度）image = w('RGBA',(width,height),cls.__gene_random_color(0,100))# 验证码的字体font = uetype(cls.__gene_random_font(),cls.fontsize)# 创建画笔draw = ImageDraw.Draw(image)# 生成字符串text = _text(cls.number)# 获取字体的尺寸font_width, font_height = size(text)# 填充字符串(((width - font_width) / 2, (height - font_height) / 2),text,font= font,fill=cls.__gene_random_color(150,255))# 绘制干扰线for x in range(0, cls.line_number):cls.__gene_line(draw, width, height)# 绘制噪点cls.__gene_points(draw, 10, width, height)# with open('captcha.png','wb') as fp:#     image.save(fp)return (text,image)if __name__ == "__main__":cap = Captcha()data = _graph_captcha()print(data)

2, 将生成的图片返回前端

(text,image) = _graph_captcha()
text 存放缓存数据库 某字段设置过期时间每次请求生成新的text, 更新 数据库中 text 字段值
image  二进制文件 可 base64编码进行返回

3, 验证逻辑接口

(1) 验证上传 cppt 验证码字段是否为空
(2) 取出缓冲数据库中 text 值 验证是否相等