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后端源码/yifan.action-ai.cn/app/utils/captcha_util.py

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+# -*- coding: utf-8 -*-
+
+import base64
+import random
+import string
+from io import BytesIO
+from typing import Tuple
+from PIL import Image, ImageDraw, ImageFont
+
+from app.config.setting import settings
+
+
+class CaptchaUtil:
+    """
+    验证码工具类
+    """
+    @classmethod 
+    def generate_captcha(cls) -> Tuple[str, str]:
+        """
+        生成带有噪声和干扰的验证码图片（4位随机字符）。
+        
+        返回:
+        - Tuple[str, str]: [base64图片字符串, 验证码值]。
+        """
+        # 生成4位随机验证码
+        chars = string.digits + string.ascii_letters
+        captcha_value = ''.join(random.sample(chars, 4))
+
+        # 创建一张随机颜色背景的图片
+        width, height = 160, 60
+        background_color = tuple(random.randint(230, 255) for _ in range(3))
+        image = Image.new('RGB', (width, height), color=background_color)
+        draw = ImageDraw.Draw(image)
+
+        # 使用指定字体
+        font = ImageFont.truetype(font=settings.CAPTCHA_FONT_PATH, size=settings.CAPTCHA_FONT_SIZE)
+
+        # 计算文本总宽度和高度
+        total_width = sum(draw.textbbox((0, 0), char, font=font)[2] for char in captcha_value)
+        text_height = draw.textbbox((0, 0), captcha_value[0], font=font)[3]
+
+        # 计算起始位置,使文字居中
+        x_start = (width - total_width) / 2
+        y_start = (height - text_height) / 2 - draw.textbbox((0, 0), captcha_value[0], font=font)[1]
+
+        # 绘制字符
+        x = x_start
+        for char in captcha_value:
+            # 使用深色文字,增加对比度
+            text_color = tuple(random.randint(0, 80) for _ in range(3))
+            
+            # 随机偏移,增加干扰
+            x_offset = x + random.uniform(-2, 2)
+            y_offset = y_start + random.uniform(-2, 2)
+            
+            # 绘制字符
+            draw.text((x_offset, y_offset), char, font=font, fill=text_color)
+            
+            # 更新x坐标,增加字符间距的随机性
+            x += draw.textbbox((0, 0), char, font=font)[2] + random.uniform(1, 5)
+
+        # 添加干扰线
+        for _ in range(4):
+            line_color = tuple(random.randint(150, 200) for _ in range(3))
+            points = [(i, int(random.uniform(0, height))) for i in range(0, width, 20)]
+            draw.line(points, fill=line_color, width=1)
+
+        # 添加随机噪点
+        for _ in range(width * height // 60):
+            point_color = tuple(random.randint(0, 255) for _ in range(3))
+            draw.point(
+                (random.randint(0, width), random.randint(0, height)),
+                fill=point_color
+            )
+
+        # 将图像数据保存到内存中并转换为base64
+        buffer = BytesIO()
+        image.save(buffer, format='PNG', optimize=True)
+        base64_string = base64.b64encode(buffer.getvalue()).decode()
+        
+        return base64_string, captcha_value
+    
+    @classmethod
+    def captcha_arithmetic(cls) -> Tuple[str, int]:
+        """
+        创建验证码图片（加减乘运算）。
+        
+        返回:
+        - Tuple[str, int]: [base64图片字符串, 计算结果]。
+        """
+        # 创建空白图像,使用随机浅色背景
+        background_color = tuple(random.randint(230, 255) for _ in range(3))
+        image = Image.new('RGB', (160, 60), color=background_color)
+        draw = ImageDraw.Draw(image)
+
+        # 设置字体
+        font = ImageFont.truetype(font=settings.CAPTCHA_FONT_PATH, size=settings.CAPTCHA_FONT_SIZE)
+
+        # 生成运算数字和运算符
+        operators = ['+', '-', '*']
+        operator = random.choice(operators)
+        
+        # 对于减法,确保num1大于num2
+        if operator == '-':
+            num1 = random.randint(6, 10)
+            num2 = random.randint(1, 5)
+        else:
+            num1 = random.randint(1, 9)
+            num2 = random.randint(1, 9)
+        
+        # 计算结果
+        result_map = {
+            '+': lambda x, y: x + y,
+            '-': lambda x, y: x - y,
+            '*': lambda x, y: x * y
+        }
+        captcha_value = result_map[operator](num1, num2)
+
+        # 绘制文本,使用深色增加对比度
+        text = f'{num1} {operator} {num2} = ?'
+        text_bbox = draw.textbbox((0, 0), text, font=font)
+        text_width = text_bbox[2] - text_bbox[0]
+        x = (160 - text_width) // 2
+        draw.text((x, 15), text, fill=(0, 0, 139), font=font)
+
+        # 添加干扰线
+        for _ in range(3):
+            line_color = tuple(random.randint(150, 200) for _ in range(3))
+            draw.line([
+                (random.randint(0, 160), random.randint(0, 60)),
+                (random.randint(0, 160), random.randint(0, 60))
+            ], fill=line_color, width=1)
+
+        # 将图像数据保存到内存中并转换为base64
+        buffer = BytesIO()
+        image.save(buffer, format='PNG', optimize=True)
+        base64_string = base64.b64encode(buffer.getvalue()).decode()
+
+        return base64_string, captcha_value