网关过滤器验证token

Love The Way You Lie 2021-12-10 23:15 333阅读 0赞

# 一、JwtUtil 工具类 #

package com.changgou.system.utils;
    
    /**
     * @author ：lijunxuan
     * @date ：Created in 2019/7/11  17:14
     * @description ：
     * @version: 1.0
     */
    
    import io.jsonwebtoken.JwtBuilder;
    import io.jsonwebtoken.Jwts;
    import io.jsonwebtoken.SignatureAlgorithm;
    
    import javax.crypto.SecretKey;
    import javax.crypto.spec.SecretKeySpec;
    import java.util.Base64;
    import java.util.Date;
    
    /**
     * JWT工具类
     */
    public class JwtUtil {
        //有效期为
        public static final Long JWT_TTL = 3600000L;// 60 * 60 *1000  一个小时
        //设置秘钥明文
        public static final String JWT_KEY = "william";
    
        /**
         * 创建token
         * @param id
         * @param subject
         * @param ttlMillis
         * @return
         */
        public static String createJWT(String id, String subject, Long ttlMillis) {
             //定义jwt签名的算法
            SignatureAlgorithm signatureAlgorithm = SignatureAlgorithm.HS256;
            //当前时间
            long nowMillis = System.currentTimeMillis();
            //将当前时间转换日期类型
            Date now = new Date(nowMillis);
            //将当前时间+超时时间
            if(ttlMillis==null){
                ttlMillis=JwtUtil.JWT_TTL;
            }
            long expMillis = nowMillis + ttlMillis;
            //将时间定义为date类型
            Date expDate = new Date(expMillis);
            //获取签名时候使用的密钥
            SecretKey secretKey = generalKey();
    
            JwtBuilder builder = Jwts.builder()
                    .setId(id)              //唯一的ID
                    .setSubject(subject)   // 主题  可以是JSON数据
                    .setIssuer("admin")     // 签发者
                    .setIssuedAt(now)      // 签发时间
                    .signWith(signatureAlgorithm, secretKey) //使用HS256对称加密算法签名, 第二个参数为秘钥
                    .setExpiration(expDate);// 设置过期时间
            return builder.compact();
        }
    
        /**
         * 生成加密后的秘钥 secretKey
         * @return
         */
        public static SecretKey generalKey() {
            byte[] encodedKey = Base64.getDecoder().decode(JwtUtil.JWT_KEY);
            SecretKey key = new SecretKeySpec(encodedKey, 0, encodedKey.length, "AES");
            return key;
        }
    }

# 二、创建过滤器，用于token验证 #

package com.william.filter;
    
    import com.william.util.JwtUtil;
    import io.jsonwebtoken.Jwts;
    import org.springframework.cloud.gateway.filter.GatewayFilterChain;
    import org.springframework.cloud.gateway.filter.GlobalFilter;
    import org.springframework.core.Ordered;
    import org.springframework.http.HttpHeaders;
    import org.springframework.http.HttpStatus;
    import org.springframework.http.server.reactive.ServerHttpRequest;
    import org.springframework.http.server.reactive.ServerHttpResponse;
    import org.springframework.stereotype.Component;
    import org.springframework.util.StringUtils;
    import org.springframework.web.server.ServerWebExchange;
    import reactor.core.publisher.Mono;
    
    /**
     * @author ：lijunxuan
     * @date ：Created in 2019/7/11  17:39
     * @description ：
     * @version: 1.0
     */
    
    /**
     * 鉴权过滤器
     * 判断用户是否有权限访问
     */
    @Component
    public class AuthorizeFilter implements GlobalFilter, Ordered {
        //请求头中的令牌常量
        public final static String TOKEN = "token";
        @Override
        public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
           //1.获取请求
            ServerHttpRequest request = exchange.getRequest();
            //2.获取响应
            ServerHttpResponse response = exchange.getResponse();
            //3.判断用户是否访问的为登录路径，如果是登录路径则放行
            if (request.getURI().getPath().contains("/admin/login")){
                return chain.filter(exchange);
            }
            //4. 获取请求头中的令牌
            HttpHeaders headers = request.getHeaders();
            String token = headers.getFirst(TOKEN);
            //5. 如果请求头中的令牌为空, 则返回错误状态码
            if (StringUtils.isEmpty(token)){
                response.setStatusCode(HttpStatus.UNAUTHORIZED);
                return response.setComplete();
            }
            //6. 解析请求头中的jwt令牌
            try {
                JwtUtil.parseJWT(token);
            } catch (Exception e) {
                //7. 如果解析出错, 说明令牌过期或者被篡改, 返回状态码
                e.printStackTrace();
                response.setStatusCode(HttpStatus.UNAUTHORIZED);
                return response.setComplete();
            }
            //8. 如果解析正常则放行
            return chain.filter(exchange);
        }
    
        @Override
        public int getOrder() {
            return 3;
        }
    }

# 测试结果 #

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NpbmF0XzM5MTc5OTkz_size_16_color_FFFFFF_t_70]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NpbmF0XzM5MTc5OTkz_size_16_color_FFFFFF_t_70 1]

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NpbmF0XzM5MTc5OTkz_size_16_color_FFFFFF_t_70]: /images/20211210/f3524eda15d54df7a8b12630b85aa6c9.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NpbmF0XzM5MTc5OTkz_size_16_color_FFFFFF_t_70 1]: /images/20211210/d378e9006ad746688a07cab34de389c8.png