若依框架添加出入参加密解密-阿里云开发者社区

收到了把项目出入参加密解密的需求（POST请求加密，GET暂不加密），主框架环境是若依。这篇文章记录一下修改的过程。

加密类型选择AES加密（如有其他加密类型可以自由替换）首先选择在gateway模块中去统一进行加密解密的操作，先说前端传来参数的解密功能，在AuthFilter中想获取前端传来的参数。

一、获取入参

AuthFilter实现了GlobalFilter，也起到全局的过滤效果。实现方法中，有一个ServerWebExchange的入参，通过这个入参可以获得ServerHttpRequest对象。

按说这个ServerHttpRequest对象中应该是能拿到请求入参的，但是照着网上一些方法去获取入参获得的却是null。（这里涉及@requestbody修饰的入参的取值方法，使用流取值，且这个流默认只会取一次的相关问题等不在这篇文章里赘述）

如果这一步是可以获取参数的，请跳过这一步。

后面在网上找到这么一个方法，写一个过滤器，获得并处理入参，并且把这个过滤器放在最前面执行（设置HIGHEST_PRECEDENCE），把处理后的入参放在后面中过滤器执行链中，直接上代码。

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.core.Ordered;
import org.springframework.core.io.buffer.DataBuffer;
import org.springframework.core.io.buffer.DataBufferUtils;
import org.springframework.http.HttpHeaders;
import org.springframework.http.MediaType;
import org.springframework.http.codec.HttpMessageReader;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpRequestDecorator;
import org.springframework.stereotype.Component;
import org.springframework.web.reactive.function.server.HandlerStrategies;
import org.springframework.web.reactive.function.server.ServerRequest;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Flux;
import reactor.core.publisher.Mono;
import java.util.List;
@Component
public class ParamsEncryptionFilter implements GlobalFilter, Ordered {
    private static final Logger log = LoggerFactory.getLogger(ParamsEncryptionFilter.class);
    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        /**
         * save request path and serviceId into gateway context
         */
        ServerHttpRequest request = exchange.getRequest();
        HttpHeaders headers = request.getHeaders();
        // 处理参数
        MediaType contentType = headers.getContentType();
        long contentLength = headers.getContentLength();
        if (contentLength > 0) {
            if (MediaType.APPLICATION_JSON.equals(contentType) || MediaType.APPLICATION_JSON_UTF8.equals(contentType)) {
                readBody(exchange, chain);
                return readBody(exchange, chain);
            }
        }
        return chain.filter(exchange);
    }
    /**
     * default HttpMessageReader
     */
    private static final List<HttpMessageReader<?>> messageReaders = HandlerStrategies.withDefaults().messageReaders();
    /**
     * ReadJsonBody
     *
     * @param exchange
     * @param chain
     * @return
     */
    private Mono<Void> readBody(ServerWebExchange exchange, GatewayFilterChain chain) {
        /**
         * join the body
         */
        return DataBufferUtils.join(exchange.getRequest().getBody()).flatMap(dataBuffer -> {
            byte[] bytes = new byte[dataBuffer.readableByteCount()];
            dataBuffer.read(bytes);
            DataBufferUtils.release(dataBuffer);
            Flux<DataBuffer> cachedFlux = Flux.defer(() -> {
                DataBuffer buffer = exchange.getResponse().bufferFactory().wrap(bytes);
                DataBufferUtils.retain(buffer);
                return Mono.just(buffer);
            });
            /**
             * repackage ServerHttpRequest
             */
            ServerHttpRequest mutatedRequest = new ServerHttpRequestDecorator(exchange.getRequest()) {
                @Override
                public Flux<DataBuffer> getBody() {
                    return cachedFlux;
                }
            };
            /**
             * mutate exchage with new ServerHttpRequest
             */
            ServerWebExchange mutatedExchange = exchange.mutate().request(mutatedRequest).build();
            /**
             * read body string with default messageReaders
             */
            return ServerRequest.create(mutatedExchange, messageReaders).bodyToMono(String.class)
                    .doOnNext(objectValue -> {
                        log.debug("[GatewayContext]Read JsonBody:{}", objectValue);
                    }).then(chain.filter(mutatedExchange));
        });
    }
    @Override
    public int getOrder() {
        return HIGHEST_PRECEDENCE;
    }
}

添加上这个过滤器后，终于可以在AuthFilter中获取到入参了，获取入参的方法代码如下：

//主要代码如下
request = getServerHttpRequest(request);//获得入参然后解密
return chain.filter(exchange.mutate().request(request).build());//然后把解密后的参数继续传下去
private ServerHttpRequest getServerHttpRequest(ServerHttpRequest request) {
        String bodyStr = resolveBodyFromRequest(request);
        System.out.println("PUT OR POST bodyStr： " + bodyStr);
        String decode = "";
        try {
            if(StringUtils.isEmpty(bodyStr)){
                return request;
            }
            decode = AESUtil.aesDecodeByKey(bodyStr, "MP5v0^zee5Qlgq5V");//解密方法可以自由替换，这里使用AES为例。
        } catch (Exception e) {
            e.printStackTrace();
        }
        URI uri = request.getURI();
        DataBuffer bodyDataBuffer = stringBuffer(decode);
        Flux<DataBuffer> bodyFlux1 = Flux.just(bodyDataBuffer);
        request = new ServerHttpRequestDecorator(request) {
            @Override
            public Flux<DataBuffer> getBody() {
                return bodyFlux1;
            }
        };
        return request;
}
private String resolveBodyFromRequest(ServerHttpRequest serverHttpRequest) {
        //获取请求体
        Flux<DataBuffer> body = serverHttpRequest.getBody();
        AtomicReference<String> bodyRef = new AtomicReference<>();
        body.subscribe(buffer -> {
            CharBuffer charBuffer = StandardCharsets.UTF_8.decode(buffer.asByteBuffer());
            DataBufferUtils.release(buffer);
            bodyRef.set(charBuffer.toString());
        });
        //获取request body
        return bodyRef.get();
}
private DataBuffer stringBuffer(String value) {
        this.value = value;
        byte[] bytes = value.getBytes(StandardCharsets.UTF_8);
        NettyDataBufferFactory nettyDataBufferFactory = new NettyDataBufferFactory(ByteBufAllocator.DEFAULT);
        DataBuffer buffer = nettyDataBufferFactory.allocateBuffer(bytes.length);
        buffer.write(bytes);
        return buffer;
    }

二、给入参加密

把AES工具类顺手贴出来：

import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;
import javax.crypto.*;
import javax.crypto.spec.SecretKeySpec;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;
/**
 * AES加解密工具类
 * mjf on 2018/3/5.
 */
public class   AESUtil {
    private static final String ENCODE_RULES = "mjfeng";
    /**
     * 加密
     * 1.构造密钥生成器
     * 2.根据ecnodeRules规则初始化密钥生成器
     * 3.产生密钥
     * 4.创建和初始化密码器
     * 5.内容加密
     * 6.返回字符串
     */
    public static String aesEncode(String content) {
        try {
            //1.构造密钥生成器，指定为AES算法,不区分大小写
            KeyGenerator keyGenerator = KeyGenerator.getInstance("AES");
            //2.根据ecnodeRules规则初始化密钥生成器
            //生成一个128位的随机源,根据传入的字节数组
            SecureRandom random = SecureRandom.getInstance("SHA1PRNG");
            random.setSeed(ENCODE_RULES.getBytes());
            keyGenerator.init(128, random);
            //3.产生原始对称密钥
            SecretKey originalKey = keyGenerator.generateKey();
            //4.获得原始对称密钥的字节数组
            byte[] raw = originalKey.getEncoded();
            //5.根据字节数组生成AES密钥
            SecretKey key = new SecretKeySpec(raw, "AES");
            //6.根据指定算法AES自成密码器
            Cipher cipher = Cipher.getInstance("AES");
            //7.初始化密码器，第一个参数为加密(Encrypt_mode)或者解密解密(Decrypt_mode)操作，第二个参数为使用的KEY
            cipher.init(Cipher.ENCRYPT_MODE, key);
            //8.获取加密内容的字节数组(这里要设置为utf-8)不然内容中如果有中文和英文混合中文就会解密为乱码
            byte[] byteEncode = content.getBytes("utf-8");
            //9.根据密码器的初始化方式--加密：将数据加密
            byte[] byteAES = cipher.doFinal(byteEncode);
            //10.将加密后的数据转换为字符串
            //这里用Base64Encoder中会找不到包
            //解决办法：
            //在项目的Build path中先移除JRE System Library，再添加库JRE System Library，重新编译后就一切正常了。
            String aesEncode = new String(new BASE64Encoder().encode(byteAES));
            //11.将字符串返回
            return aesEncode;
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        } catch (NoSuchPaddingException e) {
            e.printStackTrace();
        } catch (InvalidKeyException e) {
            e.printStackTrace();
        } catch (IllegalBlockSizeException e) {
            e.printStackTrace();
        } catch (BadPaddingException e) {
            e.printStackTrace();
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }
        //如果有错就返加nulll
        return null;
    }
    /**
     * 解密
     * 解密过程：
     * 1.同加密1-4步
     * 2.将加密后的字符串反纺成byte[]数组
     * 3.将加密内容解密
     */
    public static String aesDecode(String content) {
        try {
            //1.构造密钥生成器，指定为AES算法,不区分大小写
            KeyGenerator keygen = KeyGenerator.getInstance("AES");
            //2.根据ecnodeRules规则初始化密钥生成器
            //生成一个128位的随机源,根据传入的字节数组
            SecureRandom random = SecureRandom.getInstance("SHA1PRNG");
            random.setSeed(ENCODE_RULES.getBytes());
            keygen.init(128, random);
            //3.产生原始对称密钥
            SecretKey originalKey = keygen.generateKey();
            //4.获得原始对称密钥的字节数组
            byte[] raw = originalKey.getEncoded();
            //5.根据字节数组生成AES密钥
            SecretKey key = new SecretKeySpec(raw, "AES");
            //6.根据指定算法AES自成密码器
            Cipher cipher = Cipher.getInstance("AES");
            //7.初始化密码器，第一个参数为加密(Encrypt_mode)或者解密(Decrypt_mode)操作，第二个参数为使用的KEY
            cipher.init(Cipher.DECRYPT_MODE, key);
            //8.将加密并编码后的内容解码成字节数组
            byte[] byteContent = new BASE64Decoder().decodeBuffer(content);
            /*
             * 解密
             */
            byte[] byteDecode = cipher.doFinal(byteContent);
            String aesDecode = new String(byteDecode, "utf-8");
            return aesDecode;
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        } catch (NoSuchPaddingException e) {
            e.printStackTrace();
        } catch (InvalidKeyException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } catch (IllegalBlockSizeException e) {
            e.printStackTrace();
        } catch (BadPaddingException e) {
            e.printStackTrace();
        }
        //如果有错就返加nulll
        return null;
    }
    /**
     * 解密
     * 解密过程：
     * 1.同加密1-4步
     * 2.将加密后的字符串反纺成byte[]数组
     * 3.将加密内容解密
     */
    public static String aesDecodeByKey(String content, String aesKey) {
        try {
            byte[] byteContent = new BASE64Decoder().decodeBuffer(content);
            SecretKeySpec secretKeySpec = new SecretKeySpec(aesKey.getBytes(), "AES");
            Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");
            cipher.init(Cipher.DECRYPT_MODE, secretKeySpec);
            /*
             * 解密
             */
            byte[] byteDecode = cipher.doFinal(byteContent);
            String aesDecode = new String(byteDecode, "utf-8");
            return aesDecode;
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        } catch (NoSuchPaddingException e) {
            e.printStackTrace();
        } catch (InvalidKeyException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } catch (IllegalBlockSizeException e) {
            e.printStackTrace();
        } catch (BadPaddingException e) {
            e.printStackTrace();
        }
        //如果有错就返加nulll
        return null;
    }
    /**
     * 加密
     * 1.构造密钥生成器
     * 2.根据ecnodeRules规则初始化密钥生成器
     * 3.产生密钥
     * 4.创建和初始化密码器
     * 5.内容加密
     * 6.返回字符串
     */
    public static String aesEncodeByKey(String content, String aesKey) {
        try {
            SecretKeySpec secretKeySpec = new SecretKeySpec(aesKey.getBytes(), "AES");
            Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");
            cipher.init(Cipher.ENCRYPT_MODE, secretKeySpec);
            //8.获取加密内容的字节数组(这里要设置为utf-8)不然内容中如果有中文和英文混合中文就会解密为乱码
            byte[] byteEncode = content.getBytes("utf-8");
            //9.根据密码器的初始化方式--加密：将数据加密
            byte[] byteAES = cipher.doFinal(byteEncode);
            //10.将加密后的数据转换为字符串
            //这里用Base64Encoder中会找不到包
            //解决办法：
            //在项目的Build path中先移除JRE System Library，再添加库JRE System Library，重新编译后就一切正常了。
            String aesEncode = new String(new BASE64Encoder().encode(byteAES));
            //11.将字符串返回
            return aesEncode;
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        } catch (NoSuchPaddingException e) {
            e.printStackTrace();
        } catch (InvalidKeyException e) {
            e.printStackTrace();
        } catch (IllegalBlockSizeException e) {
            e.printStackTrace();
        } catch (BadPaddingException e) {
            e.printStackTrace();
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }
        //如果有错就返加nulll
        return null;
    }
}

三、出参加密并传给前端

出参加密也是使用继承了GlobalFilter的一个过滤器，但是中间遇到了byte数组转string丢失数据的问题。

在过滤器中获得的出参是byte[]格式的，想把byte[]转为string再进行加密操作，可是如果byte[]的长度比较大的话，转为string的时候会出现数据丢失的情况，试了几种byte[]转string的方法，要么参数前面不完整，要么后面不完整。这个问题是这么解决的，把出参加密的过滤器代码贴出来。

import com.alibaba.nacos.shaded.com.google.common.collect.Lists;
import com.google.common.base.Joiner;
import com.google.common.base.Throwables;
import com.tbenefitofcloud.common.core.utils.StringUtils;
import com.tbenefitofcloud.gateway.config.properties.IgnoreWhiteProperties;
import org.apache.commons.io.IOUtils;
import org.apache.poi.hssf.record.pivottable.StreamIDRecord;
import org.reactivestreams.Publisher;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.core.Ordered;
import org.springframework.core.io.buffer.DataBuffer;
import org.springframework.core.io.buffer.DataBufferFactory;
import org.springframework.core.io.buffer.DataBufferUtils;
import org.springframework.http.HttpStatus;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.http.server.reactive.ServerHttpResponseDecorator;
import org.springframework.stereotype.Component;
import org.springframework.util.Base64Utils;
import org.springframework.web.multipart.MultipartFile;
import org.springframework.web.multipart.MultipartRequest;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Flux;
import reactor.core.publisher.Mono;
import java.io.*;
import java.nio.ByteBuffer;
import java.nio.CharBuffer;
import java.nio.charset.Charset;
import java.nio.charset.StandardCharsets;
import java.util.List;
import static org.springframework.cloud.gateway.support.ServerWebExchangeUtils.ORIGINAL_RESPONSE_CONTENT_TYPE_ATTR;
@Component
public class ResponseFilter implements GlobalFilter, Ordered {
    private static final Logger log = LoggerFactory.getLogger(ResponseFilter.class);
    private static Joiner joiner = Joiner.on("");
    @Autowired
    private IgnoreWhiteProperties ignoreWhite;
    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        ServerHttpRequest request = exchange.getRequest();
        ServerHttpRequest.Builder mutate = request.mutate();
        String url = request.getURI().getPath();
        String methodValue = request.getMethodValue();
        ServerHttpResponse originalResponse = exchange.getResponse();
        DataBufferFactory bufferFactory = originalResponse.bufferFactory();
        log.info("进入响应拦截");
        ServerHttpResponse response = exchange.getResponse();
        DataBufferFactory dataBufferFactory = response.bufferFactory();
        ServerHttpResponseDecorator decoratedResponse = new ServerHttpResponseDecorator(response) {
            @Override
            public Mono<Void> writeWith(Publisher<? extends DataBuffer> body) {
                if (getStatusCode().equals(HttpStatus.OK) && body instanceof Flux) {
                    // 获取ContentType，判断是否返回JSON格式数据
                    String originalResponseContentType = exchange.getAttribute(ORIGINAL_RESPONSE_CONTENT_TYPE_ATTR);
                    if (StringUtils.isNotBlank(originalResponseContentType) && originalResponseContentType.contains("application/json")) {
                        Flux<? extends DataBuffer> fluxBody = Flux.from(body);
                        //（返回数据内如果字符串过大，默认会切割）解决返回体分段传输
                        return super.writeWith(fluxBody.buffer().map(dataBuffers -> {
                            List<String> list = Lists.newArrayList();
                            dataBuffers.forEach(dataBuffer -> {
                                try {
                                    byte[] content = new byte[dataBuffer.readableByteCount()];
                                    dataBuffer.read(content);
                                    DataBufferUtils.release(dataBuffer);
                                    list.add(new String(content, "utf-8"));
                                } catch (Exception e) {
                                    log.info("加载Response字节流异常，失败原因：{}", Throwables.getStackTraceAsString(e));
                                }
                            });
                            String responseData = joiner.join(list);
                            System.out.println("responseData："+responseData);
                            String s = AESUtil.aesEncodeByKey(responseData, "MP5v0^zee5Qlgq5V");
                            s =  s.replaceAll("\r\n", "").replaceAll("\n","");
                            byte[] uppedContent = new String(s.getBytes(), Charset.forName("UTF-8")).getBytes();
                            originalResponse.getHeaders().setContentLength(uppedContent.length);
                            return bufferFactory.wrap(uppedContent);
                        }));
                    }
                }
                return super.writeWith(body);
            }
        };
        return chain.filter(exchange.mutate().response(decoratedResponse).build());
    }
    @Override
    public int getOrder() {
        return -2;
    }
    private String Bytes2String(byte[] bytes){
        Charset cs = Charset.forName("UTF-8");
        ByteBuffer bb = ByteBuffer.allocate(bytes.length);
        bb.put(bytes).flip();
        CharBuffer cb = cs.decode(bb);
        String res = new String(cb.array());
        return res;
    }
}

这样出入参加密解密的基础功能就实现了。

PS：前后端加密的方式方法一定要一致，同样加密方式的不同加密方法也不行。

白名单，加密开关等功能请自由添加。

入参解密支持POST请求的@RequestBody修饰的字符串和实体类。GET请求和其他的入参注解等后续会慢慢测试。

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