Redis(案例一：注册登录-图形验证码+谷歌开源Kaptcha)

文章目录

背景Kaptcha 框架介绍添加Kaptcha依赖Kaptcha配置CommonUtil⼯具类接⼝开发JsonData响应⼯具类封装校验逻辑

背景

注册-登录-修改密码⼀般需要发送验证码，但是容易被攻击恶意调⽤

什么是短信-邮箱轰炸机

⼿机短信轰炸机是批、循环给⼿机⽆限发送各种⽹站的注册验证码短信的⽅法。

公司带来的损失

短信⼀条5分钱，如果被⼤盗刷⼤家⾃⼰计算邮箱通知不⽤钱，但被⼤盗刷，带宽、接等都被占⽤，导致⽆法正常使⽤

如何避免⾃⼰的⽹站成为”⾁鸡“或者被刷呢？

增加图形验证码(开发⼈员)
单IP请求次数限制(开发⼈员)
限制号码发送(⼀般短信提供商会做)

攻防永远是有的，只过加⼤了攻击者的成本，ROI划不过来⾃然就放弃了

Kaptcha 框架介绍

⾕歌开源的⼀个可⾼度配置的实⽤验证码⽣成⼯具
验证码的字体/⼤⼩/颜⾊
验证码内容的范围(数字，字⺟，中⽂汉字!)
验证码图⽚的⼤⼩，边框，边框粗细，边框颜⾊
验证码的⼲扰线验证码的样式(⻥眼样式、3D、普通模糊)

添加Kaptcha依赖

	 
	
		 com.baomidou
		 kaptcha-spring-boot-starter
		 1.0.0

Kaptcha配置

import com.google.code.kaptcha.Constants;
import com.google.code.kaptcha.impl.DefaultKaptcha;
import com.google.code.kaptcha.util.Config;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

import java.util.Properties;


@Configuration
public class KaptchaConfig {

    
    @Bean
    @Qualifier("kaptchaProducer")
    public DefaultKaptcha kaptcha() {
        DefaultKaptcha kaptcha = new DefaultKaptcha();
        Properties properties = new Properties();
        //验证码个数
        properties.setProperty(Constants.KAPTCHA_TEXTPRODUCER_CHAR_LENGTH, "4");
        //字体间隔
        properties.setProperty(Constants.KAPTCHA_TEXTPRODUCER_CHAR_SPACE,"8");
        //干扰线颜色

        //干扰实现类
        properties.setProperty(Constants.KAPTCHA_NOISE_IMPL, "com.google.code.kaptcha.impl.NoNoise");

        //图片样式
        properties.setProperty(Constants.KAPTCHA_OBSCURIFICATOR_IMPL, "com.google.code.kaptcha.impl.WaterRipple");

        //文字来源
        properties.setProperty(Constants.KAPTCHA_TEXTPRODUCER_CHAR_STRING, "0123456789");

        Config config = new Config(properties);
        kaptcha.setConfig(config);
        return kaptcha;
    }
}

CommonUtil⼯具类

import javax.servlet.http.HttpServletRequest;
import java.net.InetAddress;
import java.net.UnknownHostException;
import java.security.MessageDigest;


public class CommonUtil {
    
    public static String getIpAddr(HttpServletRequest request) {
        String ipAddress = null;
        try {
            ipAddress = request.getHeader("x-forwarded-for");
            if (ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {
                ipAddress = request.getHeader("Proxy-Client-IP");
            }
            if (ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {
                ipAddress = request.getHeader("WL-Proxy-Client-IP");
            }
            if (ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {
                ipAddress = request.getRemoteAddr();
                if (ipAddress.equals("127.0.0.1")) {
                    // 根据网卡取本机配置的IP
                    InetAddress inet = null;
                    try {
                        inet = InetAddress.getLocalHost();
                    } catch (UnknownHostException e) {
                        e.printStackTrace();
                    }
                    ipAddress = inet.getHostAddress();
                }
            }
            // 对于通过多个代理的情况，第一个IP为客户端真实IP,多个IP按照','分割
            if (ipAddress != null && ipAddress.length() > 15) {
                // "***.***.***.***".length()
                // = 15
                if (ipAddress.indexOf(",") > 0) {
                    ipAddress = ipAddress.substring(0, ipAddress.indexOf(","));
                }
            }
        } catch (Exception e) {
            ipAddress="";
        }
        return ipAddress;
    }



    public static String MD5(String data)  {
        try {
            java.security.MessageDigest md = MessageDigest.getInstance("MD5");
            byte[] array = md.digest(data.getBytes("UTF-8"));
            StringBuilder sb = new StringBuilder();
            for (byte item : array) {
                sb.append(Integer.toHexString((item & 0xFF) | 0x100).substring(1, 3));
            }
            return sb.toString().toUpperCase();
        } catch (Exception exception) {
        }
        return null;

    }
}

接⼝开发

import com.google.code.kaptcha.Producer;
import net.xdclass.xdclassredis.util.CommonUtil;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import javax.imageio.ImageIO;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.awt.image.BufferedImage;
import java.util.concurrent.TimeUnit;


@RestController
@RequestMapping("/api/v1/kaptcha")
public class KaptchaController {

    @Autowired
    private RedisTemplate redisTemplate;

    @Autowired
    private Producer kaptchaProducer;

    @GetMapping("get_kaptcha")
    public void getKaptcha(HttpServletRequest request, HttpServletResponse response){

        String KaptchaText = KaptchaProducer.createText();

        String key = getKaptchaKey(request);

        //10分钟过期
        redisTemplate.opsForValue().set(key,kaptchaText,10,TimeUnit.MINUTES);

        BufferedImage bufferedImage = kaptchaProducer.createImage(kaptchaText);

        ServletOutputStream outputStream = null;

        try {
            outputStream = response.getOutputStream();
            ImageIO.write(bufferedImage,"jpg",outputStream);
            outputStream.flush();
            outputStream.close();
        }catch (Exception e){
            e.printStackTrace();
        }
    }

    private String getKaptchaKey(HttpServletRequest request){
        String ip = CommonUtil.getIpAddr(request);
        String userAgent = request.getHeader("User-Agent");
        String key = "user-service:kaptcha:"+CommonUtil.MD5(ip+userAgent);
        return key;
    }
    
}

JsonData响应⼯具类封装

public class JsonData {

    
    private Integer code;

    
    private Object data;

    
    private String msg;


    public JsonData(int code,Object data,String msg){
        this.code = code;
        this.msg = msg;
        this.data = data;
    }

    
    public static JsonData buildSuccess() {
        return new JsonData(0, null, null);
    }

    
    public static JsonData buildSuccess(Object data) {
        return new JsonData(0, data, null);
    }

    
    public static JsonData buildError(String msg) {
        return new JsonData(-1, null, msg);
    }


    public Integer getCode() {
        return code;
    }

    public void setCode(Integer code) {
        this.code = code;
    }

    public Object getData() {
        return data;
    }

    public void setData(Object data) {
        this.data = data;
    }

    public String getMsg() {
        return msg;
    }

    public void setMsg(String msg) {
        this.msg = msg;
    }
}

校验逻辑

import com.google.code.kaptcha.Producer;
import net.xdclass.xdclassredis.util.CommonUtil;
import net.xdclass.xdclassredis.util.JsonData;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;

import javax.imageio.ImageIO;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.awt.image.BufferedImage;
import java.util.concurrent.TimeUnit;


@RestController
@RequestMapping("/api/v1/kaptcha")
public class KaptchaController {

    @Autowired
    private RedisTemplate redisTemplate;

    @Autowired
    private Producer kaptchaProducer;

    @GetMapping("get_kaptcha")
    public void getKaptcha(HttpServletRequest request, HttpServletResponse response){

        String kaptchaText = kaptchaProducer.createText();

        String key = getKaptchaKey(request);

        //10分钟过期
        redisTemplate.opsForValue().set(key,kaptchaText,10,TimeUnit.MINUTES);

        BufferedImage bufferedImage = kaptchaProducer.createImage(kaptchaText);

        ServletOutputStream outputStream = null;

        try {
            outputStream = response.getOutputStream();
            ImageIO.write(bufferedImage,"jpg",outputStream);
            outputStream.flush();
            outputStream.close();
        }catch (Exception e){
            e.printStackTrace();
        }

    }


    
    @GetMapping("send_code")
    public JsonData sendCode(@RequestParam(value = "to",required = true)String to,
                             @RequestParam(value = "kaptcha",required = true) String kaptcha,
                             HttpServletRequest request){

        String key = getKaptchaKey(request);
        String cacheKaptcha = redisTemplate.opsForValue().get(key);

        if(kaptcha!=null && cacheKaptcha!=null && cacheKaptcha.equalsIgnoreCase(kaptcha)){
            redisTemplate.delete(key);

            //TODO 发送验证码

            return JsonData.buildSuccess();

        }else {
            return JsonData.buildError("验证码错误");
        }

    }

    private String getKaptchaKey(HttpServletRequest request){
        String ip = CommonUtil.getIpAddr(request);
        String userAgent = request.getHeader("User-Agent");
        String key = "user-service:captcha:"+CommonUtil.MD5(ip+userAgent);
        return key;
    }

}

Redis(案例一：注册登录-图形验证码+谷歌开源Kaptcha)

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