tornado 图形验证码

 

 

from handlers import VerifyCode

urls=[
    (r'/api/piccode',VerifyCode.PicCodeHandler),
]

captcha.py

#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="simkai.ttf",   ##在Windows环境，字体一般位于C:\WINDOWS\Fonts文件夹下
                         # font_type=r"..\fonts\simfang.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
    img = Image.new(mode, size, bg_color) # 创建图形
    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

VerifyCode.py

from .BaseHandler import BaseHandler
import logging
import io
import re
import random

from utils.captcha.captcha import create_validate_code
from constants import *


class PicCodeHandler(BaseHandler):
    # #验证图形验证码
    # def get(self, *args, **kwargs):
    #     # 创建一个文件流
    #     imgio = io.BytesIO()
    #     # 生成图片对象和对应字符串
    #     img, code = create_validate_code()
    #     # 将图片信息保存到文件流
    #     img.save(imgio, 'GIF')
    #     # 返回图片
    #     self.set_header("Content-Type", "image/jpg")
    #     self.write(imgio.getvalue())


    """图片验证码"""
    def get(self):
        """获取图片验证码"""
        pre_code_id = self.get_argument("pre", "")
        cur_code_id = self.get_argument("cur","")
        # 创建一个文件流
        imgio = io.BytesIO()
        # 生成图片对象和对应字符串
        pic, text= create_validate_code()
        # 将图片信息保存到文件流
        pic.save(imgio, 'GIF')

        try:
            if pre_code_id:
                self.redis.delete("pic_code_%s" % pre_code_id)
                # self.redis.delete("")
            # self.redis.setex(name, expries, value)
            self.redis.setex("pic_code_%s" % cur_code_id, PIC_CODE_EXPIRES_SECONDS, text)
        except Exception as e:
            logging.error(e)
            self.write("")
        else:
            self.set_header("Content-Type", "image/jpg")
            # 返回图片
            self.write(imgio.getvalue())

register.html

<div class="input-group">
                    <div class="input-group-addon"><i class="fa fa-image fa-lg fa-fw"></i></div>
                    <input type="text" class="form-control" name="imagecode" id="imagecode" placeholder="图片验证码" required>
                    <div class="input-group-addon image-code" onclick="generateImageCode();"><img src=""></div>
                </div>

register.js

var imageCodeId = "";

function generateUUID() {
    var d = new Date().getTime();
    if(window.performance && typeof window.performance.now === "function"){
        d += performance.now(); //use high-precision timer if available
    }
    var uuid = 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, function(c) {
        var r = (d + Math.random()*16)%16 | 0;
        d = Math.floor(d/16);
        return (c=='x' ? r : (r&0x3|0x8)).toString(16);
    });
    return uuid;
}

function generateImageCode() {
    var picId = generateUUID();
    $(".image-code img").attr("src", "/api/piccode?pre="+imageCodeId+"&cur="+picId);
    imageCodeId = picId;
}