[oldboy-django][2深入django]登录注册页面验证码

#验证码生成

    - 在login.html 中有一张验证码图片
      设置图片的src url， 相当于发送一次get请求，返回的内容为图片渲染的内容

            <div class="col-sm-5">
                <input type="password" class="form-control" id="inputPassword3" placeholder="验证码">
            </div>
            <div class="col-sm-5">
                <img src="/check_code/" width="150px" height="34px" title="点击刷新验证码">
            </div>

    - 随机生成图片内容

        def check_code(request):
            from PIL import Image,ImageDraw
            from io import BytesIO
            f = BytesIO() # 从内存开辟一段空间
            img = Image.new(mode="RGB", size=(150,34), color=(255, 255, 255))
            draw = ImageDraw.Draw(img, mode=‘RGB‘)

            # 设置图片文本的字体
            from PIL import ImageFont
            font = ImageFont.truetype("kumo.ttf", 25)

            #7 往图片添加内容设置每个字符不同的颜色
            import random
            code_list = []
            for i in range(5):
                char = chr(random.randint(65,90))
                code_list.append(char)
                draw.text((i*20,10), char,
                          fill=(random.randint(0,255),random.randint(0,255),random.randint(0,255)),
                          font = font
                          )
            # 添加内容结束
            img.save(f,‘png‘) # 图片内容保存到内存中
            data = f.getvalue() # 读取图片内容
            return  HttpResponse(data)

    - 将验证码保存在session，用来记住用户。以便后面的验证码验证
        code = "".join(code_list)
        request.session["code"] = code

    - login验证码验证
        def login(request):
            if request.method == ‘GET‘:
                return render(request, ‘login.html‘)
            else:
                input_code = request.POST.get("code")
                session_code = request.session.get(‘code‘)
                if input_code.upper() == session_code.upper():
                    return  HttpResponse("code is correct")
                else:
                    return HttpResponse("code is invalid")

- 验证码封装
        import random
        from PIL import (Image,ImageDraw,ImageFont,ImageFilter)

        def check_code(width=120, height=30, char_length=5, font_file=‘kumo.ttf‘, font_size=28):
        code = []
        img = Image.new(mode=‘RGB‘, size=(width, height), color=(255, 255, 255))
        draw = ImageDraw.Draw(img, mode=‘RGB‘)

        def rndChar():
            """生成随机字母    :return:
            """
            return chr(random.randint(65, 90))

        def rndColor():
            """生成随机颜色:return:
            """
            return (random.randint(0, 255), random.randint(10, 255), random.randint(64, 255))
        # 写文字
        font = ImageFont.truetype(font_file, font_size)
        for i in range(char_length):
            char = rndChar()
            code.append(char)
            h = random.randint(0, 4)
            draw.text([i * width / char_length, h], char, font=font, fill=rndColor())

        # 写干扰点
        for i in range(40):
            draw.point([random.randint(0, width), random.randint(0, height)], fill=rndColor())

        # 写干扰圆圈
        for i in range(40):
            draw.point([random.randint(0, width), random.randint(0, height)], fill=rndColor())
            x = random.randint(0, width)
            y = random.randint(0, height)
            draw.arc((x, y, x + 4, y + 4), 0, 90, fill=rndColor())

        # 画干扰线
        for i in range(5):
            x1 = random.randint(0, width)
            y1 = random.randint(0, height)
            x2 = random.randint(0, width)
            y2 = random.randint(0, height)
            draw.line((x1, y1, x2, y2), fill=rndColor())

        img = img.filter(ImageFilter.EDGE_ENHANCE_MORE)
        return img, ‘‘.join(code)

# 封装后的使用

    def checkout(request):
        from io import BytesIO
        from utils.checkCode import check_code
        img, code = check_code()
        stream = BytesIO()
        img.save(stream, ‘png‘)
        request.session[‘code‘] = code
        return HttpResponse(stream.getvalue())