package com.doumee.service.common;
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import com.doumee.core.exception.BusinessException;
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import com.doumee.core.constants.ResponseStatus;
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import com.doumee.service.proxy.CacheProxy;
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import com.fasterxml.jackson.annotation.JsonIgnore;
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import io.swagger.annotations.ApiModel;
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import io.swagger.annotations.ApiModelProperty;
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import lombok.Data;
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import org.springframework.beans.factory.annotation.Autowired;
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import org.springframework.beans.factory.annotation.Value;
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import org.springframework.stereotype.Service;
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import javax.imageio.ImageIO;
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import java.awt.*;
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import java.awt.image.BufferedImage;
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import java.io.ByteArrayOutputStream;
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import java.io.IOException;
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import java.util.Base64;
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import java.util.Random;
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import java.util.UUID;
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/**
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* 图片验证码
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* @author Eva.Caesar Liu
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* @date 2023/02/14 11:14
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*/
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@Service
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public class CaptchaService {
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@Value("${cache.captcha.expire}")
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private int expire;
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// 验证码字符集
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private static final char[] CODES = { 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'J',
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'K', 'L', 'M', 'N', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W',
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'X', 'Y', 'a', 'b', 'c', 'd', 'e', 'f', 'h', 'j',
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'k', 'l', 'm', 'n', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w',
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'x', 'y', '3', '4', '5', '6', '7', '8' };
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// 验证码图片宽度
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private static final Integer WIDTH = 90;
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// 验证码图片高度
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private static final Integer HEIGHT = 30;
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@Autowired
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private CacheProxy<String, String> cacheProxy;
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/**
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* 生成验证码图片
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* @author Eva.Caesar Liu
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* @date 2023/02/14 11:14
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*/
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public Captcha genCaptcha () {
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// 定义图像buffer
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BufferedImage buffImg = new BufferedImage(WIDTH, HEIGHT, BufferedImage.TYPE_INT_RGB);
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Graphics gd = buffImg.getGraphics();
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// 创建一个随机数生成器类
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Random random = new Random();
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// 将图像填充为白色
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gd.setColor(Color.decode("#FFFFFF"));
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gd.fillRect(0, 0, WIDTH, HEIGHT);
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// 创建字体，字体的大小应该根据图片的高度来定。
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Font font = new Font("Dialog", 1, 23);
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// 设置字体
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gd.setFont(font);
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// 画边框
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// gd.setColor(Color.decode("#E6BA09"));
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gd.drawRect(0, 0, WIDTH, HEIGHT);
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// 随机产生40条干扰线，使图象中的认证码不易被其它程序探测到。
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gd.setColor(Color.decode("#990000"));
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for (int i = 0; i < 30; i++) {
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int x = random.nextInt(WIDTH);
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int y = random.nextInt(HEIGHT);
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int xl = random.nextInt(12);
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int yl = random.nextInt(12);
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gd.drawLine(x, y, x + xl, y + yl);
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}
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// randomCode用于保存随机产生的验证码，以便用户登录后进行验证。
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StringBuffer randomCode = new StringBuffer();
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int red, green, blue;
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// 随机产生codeCount数字的验证码。
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for (int i = 0; i < 4; i++) {
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// 得到随机产生的验证码数字。
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String code = String.valueOf(CODES[random.nextInt(CODES.length)]);
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// 产生随机的颜色分量来构造颜色值，这样输出的每位数字的颜色值都将不同。
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red = random.nextInt(255);
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green = random.nextInt(255);
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blue = random.nextInt(255);
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// 用随机产生的颜色将验证码绘制到图像中。
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gd.setColor(new Color(red, green, blue));
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gd.drawString(code, (i + 1) * 15, 24);
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// 将产生的四个随机数组合在一起。
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randomCode.append(code);
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}
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// 存入缓存
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Captcha captcha = new Captcha(randomCode.toString(), buffImg);
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cacheProxy.put(captcha.getUuid(), captcha.getText(), expire);
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return captcha;
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}
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/**
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* 校验验证码
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* @author Eva.Caesar Liu
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* @date 2023/02/14 11:14
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*/
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public void check(String uuid, String code) {
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String cacheCode = cacheProxy.get(uuid);
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if (cacheCode == null) {
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throw new BusinessException(ResponseStatus.VERIFICATION_CODE_INCORRECT);
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}
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cacheProxy.remove(cacheCode);
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if (!code.equalsIgnoreCase(cacheCode)) {
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throw new BusinessException(ResponseStatus.VERIFICATION_CODE_INCORRECT);
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}
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}
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/**
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* @author Eva.Caesar Liu
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* @date 2023/02/14 11:14
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*/
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@Data
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@ApiModel("验证码对象")
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public static class Captcha {
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@ApiModelProperty(value = "验证码UUID")
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private String uuid;
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@JsonIgnore
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@ApiModelProperty(value = "验证码", hidden = true)
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private String text;
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@ApiModelProperty(value = "验证码Base64")
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private String image;
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Captcha (String text, BufferedImage image) {
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this.uuid = UUID.randomUUID().toString();
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this.text = text;
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ByteArrayOutputStream stream = new ByteArrayOutputStream();
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try {
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ImageIO.write(image, "png", stream);
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} catch (IOException e) {
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throw new RuntimeException("生成验证码失败");
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}
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this.image = "data:image/png;base64," + Base64.getEncoder().encodeToString(stream.toByteArray());
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}
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}
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}
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