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python 验证码

import random
import string,os,hashlib,time
from io import BytesIO
from flask import make_response,session
# Image:一个画布
# ImageDraw:一个画笔
# ImageFont:画笔的字体
from PIL import Image,ImageDraw,ImageFont

# Captcha验证码

class Captcha(object):
        __config = {
            'seKey'  : 'www.echo500.com',
            # # 验证码加密密钥
            'codeSet'  : '2345678abcdefhijkmnpqrstuvwxyzABCDEFGHJKLMNPQRTUVWXY',
            # 验证码字符集合
            'expire' : 1800,
            # 验证码过期时间(s)
            'useZh'    : False,
            # 使用中文验证码
            'zhSet'    : '们以我到他会作时要动国产的一是工就年阶义发成部民可出能方进在了不和有大这长之物然猜'
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            # 中文验证码字符串
            'useImgBg' : False,
            # 使用背景图片
            'fontSize' : 25,
            # 验证码字体大小(px)
            'useCurve' : 0,
            # 是否画混淆曲线
            'useNoise' : False,
            # 是否添加杂点
            'imageH'   : 0,
            # 验证码图片高度
            'imageW'   : 0,
            # 验证码图片宽度
            'length'   : 4,
            # 验证码位数
            'fontttf'  : None,
            # 验证码字体,不设置随机获取
            'reset'    : True,
            # 验证成功后是否重置
            'codeSave'  :'session'
        }

        def __init__(self, config={}):
            self.__config.update(config)
            super(Captcha,self).__init__()

        def __getattr__(self, item):
            return self.by_confkey_get(item)

        def __setattr__(self, key, value):
            self.by_confkey_set(key,value)

        # 获取验证码配置
        def by_confkey_get(self,key):
            return self.__config.get(key)

        # 设置验证码配置
        def by_confkey_set(self,key,value):
            if key in self.__config:
                self.__config[key] = value

        # 生成随机的颜色
        def __gene_random_color(cls, start=0, end=255):
            random.seed()
            return (random.randint(start, end), random.randint(start, end), random.randint(start, end))

        # 生存随机字体
        def __gene_random_font(self):
            ttfPath = os.path.realpath(__file__ + '/../')
            ttfPath += '/zhttfs/' if self.useZh else '/ttfs/'
            if self.fontttf is None:
                if os.path.exists(ttfPath):
                    fontttf = random.choice(os.listdir(ttfPath))
                else:
                    raise ValueError(ttfPath + ':这个路径不存在!')
            else:
                fontttf = self.fontttf
            path = ttfPath + fontttf
            return path
        # 生存随机字符串
        def gene_text(self):
            if (self.useZh):
                # 中文列表
                SOURCE = list(self.zhSet)
            else:
                # a-b A-B 列表
                SOURCE = list(string.ascii_letters)
                # 数字加入进去
                for index in range(0, 10):
                    SOURCE.append(str(index))
            return ''.join(random.sample(SOURCE, self.length))

        # 混淆曲线
        def __gene_line(self,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=self.__gene_random_color(), width=2)
            # 用来绘制干扰点

        # 杂点
        def __gene_points(self, 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=self.__gene_random_color())
        # 加密验证码
        def __authcode(self,str):
            key = self.md5(self.seKey)[5:8]
            str = self.md5(str)[8:10]
            return self.md5(key+str)
        # md5加密
        def md5(self,str):
            hl = hashlib.md5()
            hl.update(str.encode(encoding='utf-8'))
            str = hl.hexdigest()
            return str

        '''
         * 验证验证码是否正确
         * @access public
         * @param string $code 用户验证码
         * @return bool 用户验证码是否正确
       '''
        def check(self,code):
            key   =  self.__authcode(self.seKey)
            secode  = session.get(key)
            code = code.lower()
            # 验证码不能为空
            if code is None or secode is None:
                return False
            # session过期
            if int(time.time() - secode['verify_time']) > self.expire:
                session.pop(key)
                return False
            if self.__authcode(code) == secode['verify_code']:
                # 验证成功重置
                if self.reset:
                    session.pop(key)
                return True
            return False
        def entry(self):
            # 验证码图片的宽和高
            self.imageW = self.imageW if self.imageW else self.length*self.fontSize*1.0+self.length*self.fontSize/2
            self.imageH = self.imageH if self.imageH else self.fontSize * 1.5
            image = Image.new('RGBA', (int(self.imageW), int(self.imageH)), self.__gene_random_color(0, 100))
            # # 验证码的字体
            font = ImageFont.truetype(self.__gene_random_font(),self.fontSize)
            # 创建画笔
            draw = ImageDraw.Draw(image)
            # # 生成字符串
            text = self.gene_text()
            # # 获取字体的尺寸
            font_width, font_height = font.getsize(text)

            # # 填充字符串
            draw.text(((self.imageW - font_width) / 2, (self.imageH - font_height) / 2), text, font=font,
                      fill=self.__gene_random_color(150, 255))
            # # 绘制混淆曲线
            if self.useCurve:
                for x in range(0, self.useCurve):
                    self.__gene_line(draw, int(self.imageW), int(self.imageH))
            # # 绘制杂点
            if self.useNoise:
                self.__gene_points(draw, 10, int(self.imageW), int(self.imageH))
            # 保存验证码
            key         = self.__authcode(self.seKey)
            code        = self.__authcode(text.lower())
            secode      = {}
            secode['verify_code']  = code
            secode['verify_time'] = time.time()
            session[key] = secode
            out = BytesIO()
            image.save(out, 'png')
            out.seek(0)
            resp = make_response(out.read())
            resp.content_type = 'image/png'
            return resp





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