General-AI-Platform-Backend/website/util/captcha.py

# -*- coding: utf-8 -*-
import logging
import os
import random

import settings

from PIL import Image, ImageDraw, ImageFont, ImageFilter

_letter_cases = "abcdefghjkmnpqrstuvwxy"  # 小写字母，取出干扰
_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=(140, 30),
                chars=init_chars,
                img_type="GIF",
                mode="RGB",
                bg_color=(255, 255, 255),
                fg_color=(0, 0, 255),
                font_size=18,
                font_type="ttf/%s.ttf" % random.randint(1, 6),
                length=4,
                draw_lines=True,
                n_line=(3, 8),
                draw_points=True,
                point_chance=20):
    '''
    @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 rndColor():
        return (random.randint(64, 255), random.randint(64, 255), random.randint(64, 255))

    # 随机颜色2:
    def rndColor2():
        return (random.randint(32, 127), random.randint(32, 127), random.randint(32, 127))

    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]

        # 填充每个像素:
        # for x in range(width):
        #     for y in range(height):
        #         draw.point((x, y), fill=rndColor())

        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))
                    draw.point((w, h), fill=rndColor())

    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
        logging.info(os.getcwd())
        # font_type = settings.captcha_font_path + "%s.ttf" % random.randint(1, 4)
        font_type = os.getcwd() + "/util/ttf/%s.ttf" % random.randint(1, 4)
        logging.info("font type is : %s " % font_type)
        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.BLUR)  # 滤镜，边界加强（阈值更大）
    #img = img.filter(ImageFilter.CONTOUR)
    return img, strs


"""
#字体的位置，不同版本的系统会有不同
font_path = '/Library/Fonts/Arial.ttf'
#生成几位数的验证码
number = 4
#生成验证码图片的高度和宽度
size = (100,30)
#背景颜色，默认为白色
bgcolor = (255,255,255)
#字体颜色，默认为蓝色
fontcolor = (0,0,255)
#干扰线颜色。默认为红色
linecolor = (255,0,0)
#是否要加入干扰线
draw_line = True
#加入干扰线条数的上下限
line_number = (1,5)

#用来随机生成一个字符串
def gene_text():
    source = list(string.letters)
    for index in range(0,10):
        source.append(str(index))
    return ''.join(random.sample(source,number))#number是生成验证码的位数
#用来绘制干扰线
def gene_line(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 = linecolor)

#生成验证码
def gene_code():
    width,height = size #宽和高
    image = Image.new('RGBA',(width,height),bgcolor) #创建图片
    font = ImageFont.truetype(font_path,25) #验证码的字体
    draw = ImageDraw.Draw(image)  #创建画笔
    text = gene_text() #生成字符串
    font_width, font_height = font.getsize(text)
    draw.text(((width - font_width) / number, (height - font_height) / number),text,
            font= font,fill=fontcolor) #填充字符串
    if draw_line:
        gene_line(draw,width,height)
    # image = image.transform((width+30,height+10), Image.AFFINE, (1,-0.3,0,-0.1,1,0),Image.BILINEAR)  #创建扭曲
    image = image.transform((width+20,height+10), Image.AFFINE, (1,-0.3,0,-0.1,1,0),Image.BILINEAR)  #创建扭曲
    image = image.filter(ImageFilter.EDGE_ENHANCE_MORE) #滤镜，边界加强
    image.save('idencode.png') #保存验证码图片
"""