Spring Cloud Gateway-ServerWebExchange核心方法与请求或者响应内容的修改（下）-阿里云开发者社区

修改响应体

修改响应体的需求也是比较常见的，具体的做法和修改请求体差不多。例如我们想要实现下面的功能：第三方服务请求经过网关，原始报文是密文，我们需要在网关实现密文解密，然后把解密后的明文路由到下游服务，下游服务处理成功响应明文，需要在网关把明文加密成密文再返回到第三方服务。现在简化整个流程，用AES加密算法，统一密码为字符串"throwable"，假设请求报文和响应报文明文如下：

// 请求密文
{
    "serialNumber": "请求流水号",
    "payload" : "加密后的请求消息载荷"
}
// 请求明文（仅仅作为提示）
{
    "serialNumber": "请求流水号",
    "payload" : "{\"name:\":\"doge\"}"
}
// 响应密文
{
    "code": 200,
    "message":"ok",
    "payload" : "加密后的响应消息载荷"
}
// 响应明文（仅仅作为提示）
{
    "code": 200,
    "message":"ok",
    "payload" : "{\"name:\":\"doge\",\"age\":26}"
}
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为了方便一些加解密或者编码解码的实现，需要引入Apache的commons-codec类库：

<dependency>
    <groupId>commons-codec</groupId>
    <artifactId>commons-codec</artifactId>
    <version>1.12</version>
</dependency>
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这里定义一个全局过滤器专门处理加解密，实际上最好结合真实的场景决定是否适合全局过滤器，这里只是一个示例：

// AES加解密工具类
public enum AesUtils {
    // 单例
    X;
    private static final String PASSWORD = "throwable";
    private static final String KEY_ALGORITHM = "AES";
    private static final String SECURE_RANDOM_ALGORITHM = "SHA1PRNG";
    private static final String DEFAULT_CIPHER_ALGORITHM = "AES/ECB/PKCS5Padding";
    public String encrypt(String content) {
        try {
            Cipher cipher = Cipher.getInstance(DEFAULT_CIPHER_ALGORITHM);
            cipher.init(Cipher.ENCRYPT_MODE, provideSecretKey());
            return Hex.encodeHexString(cipher.doFinal(content.getBytes(StandardCharsets.UTF_8)));
        } catch (Exception e) {
            throw new IllegalArgumentException(e);
        }
    }
    public byte[] decrypt(String content) {
        try {
            Cipher cipher = Cipher.getInstance(DEFAULT_CIPHER_ALGORITHM);
            cipher.init(Cipher.DECRYPT_MODE, provideSecretKey());
            return cipher.doFinal(Hex.decodeHex(content));
        } catch (Exception e) {
            throw new IllegalArgumentException(e);
        }
    }
    private SecretKey provideSecretKey() {
        try {
            KeyGenerator keyGen = KeyGenerator.getInstance(KEY_ALGORITHM);
            SecureRandom secureRandom = SecureRandom.getInstance(SECURE_RANDOM_ALGORITHM);
            secureRandom.setSeed(PASSWORD.getBytes(StandardCharsets.UTF_8));
            keyGen.init(128, secureRandom);
            return new SecretKeySpec(keyGen.generateKey().getEncoded(), KEY_ALGORITHM);
        } catch (Exception e) {
            throw new IllegalArgumentException(e);
        }
    }
}
// EncryptionGlobalFilter
@Slf4j
@Component
public class EncryptionGlobalFilter implements GlobalFilter, Ordered {
    @Autowired
    private ObjectMapper objectMapper;
    @Override
    public int getOrder() {
        return -2;
    }
    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        ServerHttpRequest request = exchange.getRequest();
        ServerHttpResponse response = exchange.getResponse();
        DataBufferFactory bufferFactory = exchange.getResponse().bufferFactory();
        ServerHttpRequestDecorator requestDecorator = processRequest(request, bufferFactory);
        ServerHttpResponseDecorator responseDecorator = processResponse(response, bufferFactory);
        return chain.filter(exchange.mutate().request(requestDecorator).response(responseDecorator).build());
    }
    private ServerHttpRequestDecorator processRequest(ServerHttpRequest request, DataBufferFactory bufferFactory) {
        Flux<DataBuffer> body = request.getBody();
        DataBufferHolder holder = new DataBufferHolder();
        body.subscribe(dataBuffer -> {
            int len = dataBuffer.readableByteCount();
            holder.length = len;
            byte[] bytes = new byte[len];
            dataBuffer.read(bytes);
            DataBufferUtils.release(dataBuffer);
            String text = new String(bytes, StandardCharsets.UTF_8);
            JsonNode jsonNode = readNode(text);
            JsonNode payload = jsonNode.get("payload");
            String payloadText = payload.asText();
            byte[] content = AesUtils.X.decrypt(payloadText);
            String requestBody = new String(content, StandardCharsets.UTF_8);
            log.info("修改请求体payload,修改前:{},修改后:{}", payloadText, requestBody);
            rewritePayloadNode(requestBody, jsonNode);
            DataBuffer data = bufferFactory.allocateBuffer();
            data.write(jsonNode.toString().getBytes(StandardCharsets.UTF_8));
            holder.dataBuffer = data;
        });
        HttpHeaders headers = new HttpHeaders();
        headers.putAll(request.getHeaders());
        headers.remove(HttpHeaders.CONTENT_LENGTH);
        return new ServerHttpRequestDecorator(request) {
            @Override
            public HttpHeaders getHeaders() {
                int contentLength = holder.length;
                if (contentLength > 0) {
                    headers.setContentLength(contentLength);
                } else {
                    headers.set(HttpHeaders.TRANSFER_ENCODING, "chunked");
                }
                return headers;
            }
            @Override
            public Flux<DataBuffer> getBody() {
                return Flux.just(holder.dataBuffer);
            }
        };
    }
    private ServerHttpResponseDecorator processResponse(ServerHttpResponse response, DataBufferFactory bufferFactory) {
        return new ServerHttpResponseDecorator(response) {
            @SuppressWarnings("unchecked")
            @Override
            public Mono<Void> writeWith(Publisher<? extends DataBuffer> body) {
                if (body instanceof Flux) {
                    Flux<? extends DataBuffer> flux = (Flux<? extends DataBuffer>) body;
                    return super.writeWith(flux.map(buffer -> {
                        CharBuffer charBuffer = StandardCharsets.UTF_8.decode(buffer.asByteBuffer());
                        DataBufferUtils.release(buffer);
                        JsonNode jsonNode = readNode(charBuffer.toString());
                        JsonNode payload = jsonNode.get("payload");
                        String text = payload.toString();
                        String content = AesUtils.X.encrypt(text);
                        log.info("修改响应体payload,修改前:{},修改后:{}", text, content);
                        setPayloadTextNode(content, jsonNode);
                        return bufferFactory.wrap(jsonNode.toString().getBytes(StandardCharsets.UTF_8));
                    }));
                }
                return super.writeWith(body);
            }
        };
    }
    private void rewritePayloadNode(String text, JsonNode root) {
        try {
            JsonNode node = objectMapper.readTree(text);
            ObjectNode objectNode = (ObjectNode) root;
            objectNode.set("payload", node);
        } catch (Exception e) {
            throw new IllegalStateException(e);
        }
    }
    private void setPayloadTextNode(String text, JsonNode root) {
        try {
            ObjectNode objectNode = (ObjectNode) root;
            objectNode.set("payload", new TextNode(text));
        } catch (Exception e) {
            throw new IllegalStateException(e);
        }
    }
    private JsonNode readNode(String in) {
        try {
            return objectMapper.readTree(in);
        } catch (Exception e) {
            throw new IllegalStateException(e);
        }
    }
    private class DataBufferHolder {
        DataBuffer dataBuffer;
        int length;
    }
}  
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先准备一份密文：

Map<String, Object> json = new HashMap<>(8);
json.put("serialNumber", "请求流水号");
String content = "{\"name\": \"doge\"}";
json.put("payload", AesUtils.X.encrypt(content));
System.out.println(new ObjectMapper().writeValueAsString(json));
// 输出
{"serialNumber":"请求流水号","payload":"144e3dc734743f5709f1adf857bca473da683246fd612f86ac70edeb5f2d2729"}
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模拟请求：

POST /order/json HTTP/1.1
Host: localhost:9090
accessToken: 10086
Content-Type: application/json
User-Agent: PostmanRuntime/7.13.0
Accept: */*
Cache-Control: no-cache
Postman-Token: bda07fc3-ea1a-478c-b4d7-754fe6f37200,634734d9-feed-4fc9-ba20-7618bd986e1c
Host: localhost:9090
cookie: customCookieName=customCookieValue
accept-encoding: gzip, deflate
content-length: 104
Connection: keep-alive
cache-control: no-cache
{
    "serialNumber": "请求流水号",
    "payload": "FE49xzR0P1cJ8a34V7ykc9poMkb9YS+GrHDt618tJyk="
}
// 响应结果
{
    "serialNumber": "请求流水号",
    "payload": "oo/K1igg2t/S8EExkBVGWOfI1gAh5pBpZ0wyjNPW6e8="   # <--- 解密后：{"name":"doge","age":26}
}
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遇到的问题：

必须实现Ordered接口，返回一个小于-1的order值，这是因为NettyWriteResponseFilter的order值为-1，我们需要覆盖返回响应体的逻辑，自定义的GlobalFilter必须比NettyWriteResponseFilter优先执行。
网关每次重启之后，第一个请求总是无法从原始的ServerHttpRequest读取到有效的Body，准确来说出现的现象是NettyRoutingFilter调用ServerHttpRequest#getBody()的时候获取到一个空的对象，导致空指针；奇怪的是从第二个请求开始就能正常调用。笔者把Spring Cloud Gateway的版本降低到Finchley.SR3，Spring Boot的版本降低到2.0.8.RELEASE，问题不再出现，初步确定是Spring Cloud Gateway版本升级导致的兼容性问题或者是BUG。

最重要的是用到了ServerHttpResponse装饰器ServerHttpResponseDecorator，主要覆盖写入响应体数据缓冲区的部分，至于怎么处理其他逻辑需要自行考虑，这里只是做一个简单的示范。一般的代码逻辑如下：

ServerHttpResponse response = exchange.getResponse();
ServerHttpResponseDecorator responseDecorator = new ServerHttpResponseDecorator(response) {
            @Override
            public Mono<Void> writeWith(Publisher<? extends DataBuffer> body) {
                if (body instanceof Flux) {
                    Flux<? extends DataBuffer> flux = (Flux<? extends DataBuffer>) body;
                    return super.writeWith(flux.map(buffer -> {
                        // buffer就是原始的响应数据的缓冲区
                        // 下面处理完毕之后返回新的响应数据的缓冲区即可
                        return bufferFactory.wrap(...);
                    }));
                }
                return super.writeWith(body);
            }
        };
return chain.filter(exchange.mutate().response(responseDecorator).build());    
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请求体或者响应体报文过大的问题

有热心的同学告诉笔者，如果请求报文过大或者响应报文过大的时候，前面两节的修改请求和响应报文的方法会出现问题，这里尝试重现一下遇到的具体问题。先把请求报文尝试加长：

Map<String, Object> json = new HashMap<>(8);
json.put("serialNumber", "请求流水号");
StringBuilder builder = new StringBuilder();
for (int i = 0; i < 1000; i++) {
    builder.append("doge");
}
String content = String.format("{\"name\": \"%s\"}", builder.toString());
json.put("payload", AesUtils.X.encrypt(content));
System.out.println(new ObjectMapper().writeValueAsString(json));
// 请求的JSON报文如下：
{
    "serialNumber": "请求流水号",
    "payload": "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"
}
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用上面的请求报文发起请求，确实存在问题：

微信截图_20220512174522.png

主要问题是：

请求体包数据装成的Flux<DataBuffer>实例被订阅之后，读取到的字节数组的长度被截断了，提供的原始请求报文里面字符串长度要大于1000，转换成byte数组绝对要大于1000，但是上面的示例中只读取到长度为673的byte数组。
读取到的字节数组被截断后，则使用Jackson进行反序列化的时候提示没有读取到字符串的EOF标识，导致反序列化失败。

既然遇到了问题，就想办法解决。首先第一步定位一下是什么原因，直觉告诉笔者：要开启一下DEBUG日志进行观察，如果还没有头绪可能要跟踪一下源码。

开启DEBUG日志级别之后做一次请求，发现了一些可疑的日志信息：

2019-05-19 11:16:15.660 [reactor-http-nio-2] DEBUG reactor.ipc.netty.http.server.HttpServer - [id: 0xa9b527e5, L:/0:0:0:0:0:0:0:1:9090 - R:/0:0:0:0:0:0:0:1:58012] READ COMPLETE
2019-05-19 11:16:15.660 [reactor-http-nio-2] DEBUG reactor.ipc.netty.http.server.HttpServer - [id: 0xa9b527e5, L:/0:0:0:0:0:0:0:1:9090 ! R:/0:0:0:0:0:0:0:1:58012] INACTIVE
2019-05-19 11:16:15.660 [reactor-http-nio-3] DEBUG reactor.ipc.netty.http.server.HttpServer - [id: 0x5554e091, L:/0:0:0:0:0:0:0:1:9090 - R:/0:0:0:0:0:0:0:1:58013] READ: 1024B
         +-------------------------------------------------+
         |  0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f |
+--------+-------------------------------------------------+----------------+
|00000000| 50 4f 53 54 20 2f 6f 72 64 65 72 2f 6a 73 6f 6e |POST /order/json|
|00000010| 20 48 54 54 50 2f 31 2e 31 0d 0a 61 63 63 65 73 | HTTP/1.1..acces|
|00000020| 73 54 6f 6b 65 6e 3a 20 31 30 30 38 36 0d 0a 43 |sToken: 10086..C|
|00000030| 6f 6e 74 65 6e 74 2d 54 79 70 65 3a 20 61 70 70 |ontent-Type: app|
|00000040| 6c 69 63 61 74 69 6f 6e 2f 6a 73 6f 6e 0d 0a 55 |lication/json..U|
|00000050| 73 65 72 2d 41 67 65 6e 74 3a 20 50 6f 73 74 6d |ser-Agent: Postm|
|00000060| 61 6e 52 75 6e 74 69 6d 65 2f 37 2e 31 33 2e 30 |anRuntime/7.13.0|
|00000070| 0d 0a 41 63 63 65 70 74 3a 20 2a 2f 2a 0d 0a 43 |..Accept: */*..C|
|00000080| 61 63 68 65 2d 43 6f 6e 74 72 6f 6c 3a 20 6e 6f |ache-Control: no|
|00000090| 2d 63 61 63 68 65 0d 0a 50 6f 73 74 6d 61 6e 2d |-cache..Postman-|
|000000a0| 54 6f 6b 65 6e 3a 20 31 31 32 30 38 64 35 39 2d |Token: 11208d59-|
|000000b0| 65 61 34 61 2d 34 62 39 63 2d 61 30 33 39 2d 30 |ea4a-4b9c-a039-0|
|000000c0| 30 65 36 64 38 61 30 65 33 65 66 0d 0a 48 6f 73 |0e6d8a0e3ef..Hos|
|000000d0| 74 3a 20 6c 6f 63 61 6c 68 6f 73 74 3a 39 30 39 |t: localhost:909|
|000000e0| 30 0d 0a 63 6f 6f 6b 69 65 3a 20 63 75 73 74 6f |0..cookie: custo|
|000000f0| 6d 43 6f 6f 6b 69 65 4e 61 6d 65 3d 63 75 73 74 |mCookieName=cust|
|00000100| 6f 6d 43 6f 6f 6b 69 65 56 61 6c 75 65 0d 0a 61 |omCookieValue..a|
|00000110| 63 63 65 70 74 2d 65 6e 63 6f 64 69 6e 67 3a 20 |ccept-encoding: |
|00000120| 67 7a 69 70 2c 20 64 65 66 6c 61 74 65 0d 0a 63 |gzip, deflate..c|
|00000130| 6f 6e 74 65 6e 74 2d 6c 65 6e 67 74 68 3a 20 35 |ontent-length: 5|
|00000140| 34 31 36 0d 0a 43 6f 6e 6e 65 63 74 69 6f 6e 3a |416..Connection:|
|00000150| 20 6b 65 65 70 2d 61 6c 69 76 65 0d 0a 0d 0a 7b | keep-alive....{|
|00000160| 0a 20 20 20 20 22 73 65 72 69 61 6c 4e 75 6d 62 |.    "serialNumb|
|00000170| 65 72 22 3a 20 22 e8 af b7 e6 b1 82 e6 b5 81 e6 |er": "..........|
|00000180| b0 b4 e5 8f b7 22 2c 0a 20 20 20 20 22 70 61 79 |.....",.    "pay|
|00000190| 6c 6f 61 64 22 3a 20 22 30 44 63 66 32 70 6c 46 |load": "0Dcf2plF|
|000001a0| 70 45 53 70 72 4b 6a 6b 64 71 4e 48 4d 38 6a 6a |pESprKjkdqNHM8jj|
|000001b0| 49 41 72 6b 64 37 58 57 35 4c 6c 32 2f 71 61 42 |IArkd7XW5Ll2/qaB|
|000001c0| 71 76 2f 49 34 79 41 4b 35 48 65 31 31 75 53 35 |qv/I4yAK5He11uS5|
|000001d0| 64 76 36 6d 67 61 72 2f 79 4f 4d 67 43 75 52 33 |dv6mgar/yOMgCuR3|
|000001e0| 74 64 62 6b 75 58 62 2b 70 6f 47 71 2f 38 6a 6a |tdbkuXb+poGq/8jj|
|000001f0| 49 41 72 6b 64 37 58 57 35 4c 6c 32 2f 71 61 42 |IArkd7XW5Ll2/qaB|
|00000200| 71 76 2f 49 34 79 41 4b 35 48 65 31 31 75 53 35 |qv/I4yAK5He11uS5|
|00000210| 64 76 36 6d 67 61 72 2f 79 4f 4d 67 43 75 52 33 |dv6mgar/yOMgCuR3|
|00000220| 74 64 62 6b 75 58 62 2b 70 6f 47 71 2f 38 6a 6a |tdbkuXb+poGq/8jj|
|00000230| 49 41 72 6b 64 37 58 57 35 4c 6c 32 2f 71 61 42 |IArkd7XW5Ll2/qaB|
|00000240| 71 76 2f 49 34 79 41 4b 35 48 65 31 31 75 53 35 |qv/I4yAK5He11uS5|
|00000250| 64 76 36 6d 67 61 72 2f 79 4f 4d 67 43 75 52 33 |dv6mgar/yOMgCuR3|
|00000260| 74 64 62 6b 75 58 62 2b 70 6f 47 71 2f 38 6a 6a |tdbkuXb+poGq/8jj|
|00000270| 49 41 72 6b 64 37 58 57 35 4c 6c 32 2f 71 61 42 |IArkd7XW5Ll2/qaB|
|00000280| 71 76 2f 49 34 79 41 4b 35 48 65 31 31 75 53 35 |qv/I4yAK5He11uS5|
|00000290| 64 76 36 6d 67 61 72 2f 79 4f 4d 67 43 75 52 33 |dv6mgar/yOMgCuR3|
|000002a0| 74 64 62 6b 75 58 62 2b 70 6f 47 71 2f 38 6a 6a |tdbkuXb+poGq/8jj|
|000002b0| 49 41 72 6b 64 37 58 57 35 4c 6c 32 2f 71 61 42 |IArkd7XW5Ll2/qaB|
|000002c0| 71 76 2f 49 34 79 41 4b 35 48 65 31 31 75 53 35 |qv/I4yAK5He11uS5|
|000002d0| 64 76 36 6d 67 61 72 2f 79 4f 4d 67 43 75 52 33 |dv6mgar/yOMgCuR3|
|000002e0| 74 64 62 6b 75 58 62 2b 70 6f 47 71 2f 38 6a 6a |tdbkuXb+poGq/8jj|
|000002f0| 49 41 72 6b 64 37 58 57 35 4c 6c 32 2f 71 61 42 |IArkd7XW5Ll2/qaB|
|00000300| 71 76 2f 49 34 79 41 4b 35 48 65 31 31 75 53 35 |qv/I4yAK5He11uS5|
|00000310| 64 76 36 6d 67 61 72 2f 79 4f 4d 67 43 75 52 33 |dv6mgar/yOMgCuR3|
|00000320| 74 64 62 6b 75 58 62 2b 70 6f 47 71 2f 38 6a 6a |tdbkuXb+poGq/8jj|
|00000330| 49 41 72 6b 64 37 58 57 35 4c 6c 32 2f 71 61 42 |IArkd7XW5Ll2/qaB|
|00000340| 71 76 2f 49 34 79 41 4b 35 48 65 31 31 75 53 35 |qv/I4yAK5He11uS5|
|00000350| 64 76 36 6d 67 61 72 2f 79 4f 4d 67 43 75 52 33 |dv6mgar/yOMgCuR3|
|00000360| 74 64 62 6b 75 58 62 2b 70 6f 47 71 2f 38 6a 6a |tdbkuXb+poGq/8jj|
|00000370| 49 41 72 6b 64 37 58 57 35 4c 6c 32 2f 71 61 42 |IArkd7XW5Ll2/qaB|
|00000380| 71 76 2f 49 34 79 41 4b 35 48 65 31 31 75 53 35 |qv/I4yAK5He11uS5|
|00000390| 64 76 36 6d 67 61 72 2f 79 4f 4d 67 43 75 52 33 |dv6mgar/yOMgCuR3|
|000003a0| 74 64 62 6b 75 58 62 2b 70 6f 47 71 2f 38 6a 6a |tdbkuXb+poGq/8jj|
|000003b0| 49 41 72 6b 64 37 58 57 35 4c 6c 32 2f 71 61 42 |IArkd7XW5Ll2/qaB|
|000003c0| 71 76 2f 49 34 79 41 4b 35 48 65 31 31 75 53 35 |qv/I4yAK5He11uS5|
|000003d0| 64 76 36 6d 67 61 72 2f 79 4f 4d 67 43 75 52 33 |dv6mgar/yOMgCuR3|
|000003e0| 74 64 62 6b 75 58 62 2b 70 6f 47 71 2f 38 6a 6a |tdbkuXb+poGq/8jj|
|000003f0| 49 41 72 6b 64 37 58 57 35 4c 6c 32 2f 71 61 42 |IArkd7XW5Ll2/qaB|
+--------+-------------------------------------------------+----------------+
2019-05-19 11:16:15.662 [reactor-http-nio-2] DEBUG reactor.ipc.netty.http.server.HttpServer - [id: 0xa9b527e5, L:/0:0:0:0:0:0:0:1:9090 ! R:/0:0:0:0:0:0:0:1:58012] UNREGISTERED
2019-05-19 11:16:15.665 [reactor-http-nio-3] DEBUG reactor.ipc.netty.http.server.HttpServerOperations - [id: 0x5554e091, L:/0:0:0:0:0:0:0:1:9090 - R:/0:0:0:0:0:0:0:1:58013] Increasing pending responses, now 1
2019-05-19 11:16:15.671 [reactor-http-nio-3] DEBUG reactor.ipc.netty.http.server.HttpServer - [id: 0x5554e091, L:/0:0:0:0:0:0:0:1:9090 - R:/0:0:0:0:0:0:0:1:58013] READ COMPLETE
复制代码

注意一下关键字READ: 1024B，这里应该是底层的Reactor-Netty读取的最大数据报的长度限制，打印出来的数据报刚好也是1024B的大小，这个应该就是导致请求体被截断的根本原因；这个问题不单单会出现在请求体的获取，也会出现在响应体的写入。既然这个是共性的问题，那么项目Github上肯定有对应的Issue，找到一个互动比较长的gateway request size limit 1024B because netty default limit 1024,how to solve it? #581，从回答来看，官方建议使用ModifyRequestBodyGatewayFilterFactory和ModifyResponseBodyGatewayFilterFactory完成对应的功能。这里可以尝试借鉴一下ModifyRequestBodyGatewayFilterFactory的实现方式修改之前的代码，因为代码的逻辑比较长和复杂，解密请求体的过滤器拆分到新的类RequestEncryptionGlobalFilter，加密响应体的过滤器拆分到ResponseDecryptionGlobalFilter：

RequestEncryptionGlobalFilter的代码如下：

@Slf4j
@Component
public class RequestEncryptionGlobalFilter implements GlobalFilter, Ordered {
    @Autowired
    private ObjectMapper objectMapper;
    private final List<HttpMessageReader<?>> messageReaders = HandlerStrategies.withDefaults().messageReaders();
    @Override
    public int getOrder() {
        return -2;
    }
    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        return processRequest(exchange, chain);
    }
    private Mono<Void> processRequest(ServerWebExchange exchange, GatewayFilterChain chain) {
        ServerRequest serverRequest = new DefaultServerRequest(exchange, messageReaders);
        DataBufferFactory bufferFactory = exchange.getResponse().bufferFactory();
        Mono<String> rawBody = serverRequest.bodyToMono(String.class).map(s -> s);
        BodyInserter<Mono<String>, ReactiveHttpOutputMessage> bodyInserter = BodyInserters.fromPublisher(rawBody, String.class);
        HttpHeaders tempHeaders = new HttpHeaders();
        tempHeaders.putAll(exchange.getRequest().getHeaders());
        tempHeaders.remove(HttpHeaders.CONTENT_LENGTH);
        CachedBodyOutputMessage outputMessage = new CachedBodyOutputMessage(exchange, tempHeaders);
        return bodyInserter.insert(outputMessage, new BodyInserterContext()).then(Mono.defer(() -> {
            Flux<DataBuffer> body = outputMessage.getBody();
            DataBufferHolder holder = new DataBufferHolder();
            body.subscribe(dataBuffer -> {
                int len = dataBuffer.readableByteCount();
                holder.length = len;
                byte[] bytes = new byte[len];
                dataBuffer.read(bytes);
                DataBufferUtils.release(dataBuffer);
                String text = new String(bytes, StandardCharsets.UTF_8);
                JsonNode jsonNode = readNode(text);
                JsonNode payload = jsonNode.get("payload");
                String payloadText = payload.asText();
                byte[] content = AesUtils.X.decrypt(payloadText);
                String requestBody = new String(content, StandardCharsets.UTF_8);
                log.info("修改请求体payload,修改前:{},修改后:{}", payloadText, requestBody);
                rewritePayloadNode(requestBody, jsonNode);
                DataBuffer data = bufferFactory.allocateBuffer();
                data.write(jsonNode.toString().getBytes(StandardCharsets.UTF_8));
                holder.dataBuffer = data;
            });
            ServerHttpRequestDecorator requestDecorator = new ServerHttpRequestDecorator(exchange.getRequest()) {
                @Override
                public HttpHeaders getHeaders() {
                    long contentLength = tempHeaders.getContentLength();
                    HttpHeaders httpHeaders = new HttpHeaders();
                    httpHeaders.putAll(super.getHeaders());
                    if (contentLength > 0) {
                        httpHeaders.setContentLength(contentLength);
                    } else {
                        httpHeaders.set(HttpHeaders.TRANSFER_ENCODING, "chunked");
                    }
                    return httpHeaders;
                }
                @Override
                public Flux<DataBuffer> getBody() {
                    return Flux.just(holder.dataBuffer);
                }
            };
            return chain.filter(exchange.mutate().request(requestDecorator).build());
        }));
    }
    private void rewritePayloadNode(String text, JsonNode root) {
        try {
            JsonNode node = objectMapper.readTree(text);
            ObjectNode objectNode = (ObjectNode) root;
            objectNode.set("payload", node);
        } catch (Exception e) {
            throw new IllegalStateException(e);
        }
    }
    private void setPayloadTextNode(String text, JsonNode root) {
        try {
            ObjectNode objectNode = (ObjectNode) root;
            objectNode.set("payload", new TextNode(text));
        } catch (Exception e) {
            throw new IllegalStateException(e);
        }
    }
    private JsonNode readNode(String in) {
        try {
            return objectMapper.readTree(in);
        } catch (Exception e) {
            throw new IllegalStateException(e);
        }
    }
    private class DataBufferHolder {
        DataBuffer dataBuffer;
        int length;
    }
}
复制代码

ResponseDecryptionGlobalFilter的代码如下：

@Slf4j
@Component
public class ResponseDecryptionGlobalFilter implements GlobalFilter, Ordered {
    @Autowired
    private ObjectMapper objectMapper;
    @Override
    public int getOrder() {
        return NettyWriteResponseFilter.WRITE_RESPONSE_FILTER_ORDER - 1;
    }
    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        return processResponse(exchange, chain);
    }
    private Mono<Void> processResponse(ServerWebExchange exchange, GatewayFilterChain chain) {
        ServerHttpResponseDecorator responseDecorator = new ServerHttpResponseDecorator(exchange.getResponse()) {
            @Override
            public Mono<Void> writeWith(Publisher<? extends DataBuffer> body) {
                String originalResponseContentType = exchange.getAttribute(ORIGINAL_RESPONSE_CONTENT_TYPE_ATTR);
                HttpHeaders httpHeaders = new HttpHeaders();
                httpHeaders.add(HttpHeaders.CONTENT_TYPE, originalResponseContentType);
                ResponseAdapter responseAdapter = new ResponseAdapter(body, httpHeaders);
                DefaultClientResponse clientResponse = new DefaultClientResponse(responseAdapter, ExchangeStrategies.withDefaults());
                Mono<String> rawBody = clientResponse.bodyToMono(String.class).map(s -> s);
                BodyInserter<Mono<String>, ReactiveHttpOutputMessage> bodyInserter = BodyInserters.fromPublisher(rawBody, String.class);
                CachedBodyOutputMessage outputMessage = new CachedBodyOutputMessage(exchange, exchange.getResponse().getHeaders());
                return bodyInserter.insert(outputMessage, new BodyInserterContext())
                        .then(Mono.defer(() -> {
                            Flux<DataBuffer> messageBody = outputMessage.getBody();
                            Flux<DataBuffer> flux = messageBody.map(buffer -> {
                                CharBuffer charBuffer = StandardCharsets.UTF_8.decode(buffer.asByteBuffer());
                                DataBufferUtils.release(buffer);
                                JsonNode jsonNode = readNode(charBuffer.toString());
                                JsonNode payload = jsonNode.get("payload");
                                String text = payload.toString();
                                String content = AesUtils.X.encrypt(text);
                                log.info("修改响应体payload,修改前:{},修改后:{}", text, content);
                                setPayloadTextNode(content, jsonNode);
                                return getDelegate().bufferFactory().wrap(jsonNode.toString().getBytes(StandardCharsets.UTF_8));
                            });
                            HttpHeaders headers = getDelegate().getHeaders();
                            if (!headers.containsKey(HttpHeaders.TRANSFER_ENCODING)) {
                                flux = flux.doOnNext(data -> headers.setContentLength(data.readableByteCount()));
                            }
                            return getDelegate().writeWith(flux);
                        }));
            }
        };
        return chain.filter(exchange.mutate().response(responseDecorator).build());
    }
    private void setPayloadTextNode(String text, JsonNode root) {
        try {
            ObjectNode objectNode = (ObjectNode) root;
            objectNode.set("payload", new TextNode(text));
        } catch (Exception e) {
            throw new IllegalStateException(e);
        }
    }
    private JsonNode readNode(String in) {
        try {
            return objectMapper.readTree(in);
        } catch (Exception e) {
            throw new IllegalStateException(e);
        }
    }
    private class ResponseAdapter implements ClientHttpResponse {
        private final Flux<DataBuffer> flux;
        private final HttpHeaders headers;
        @SuppressWarnings("unchecked")
        private ResponseAdapter(Publisher<? extends DataBuffer> body, HttpHeaders headers) {
            this.headers = headers;
            if (body instanceof Flux) {
                flux = (Flux) body;
            } else {
                flux = ((Mono) body).flux();
            }
        }
        @Override
        public Flux<DataBuffer> getBody() {
            return flux;
        }
        @Override
        public HttpHeaders getHeaders() {
            return headers;
        }
        @Override
        public HttpStatus getStatusCode() {
            return null;
        }
        @Override
        public int getRawStatusCode() {
            return 0;
        }
        @Override
        public MultiValueMap<String, ResponseCookie> getCookies() {
            return null;
        }
    }
}
复制代码

模拟请求：

POST /order/json HTTP/1.1
Host: localhost:9090
accessToken: 10086
Content-Type: application/json
User-Agent: PostmanRuntime/7.13.0
Accept: */*
Cache-Control: no-cache
Postman-Token: 3a830202-f3d1-450e-839f-ae8f3b88bced,b229feb1-7c8b-4d25-a039-09345f3fe8f0
Host: localhost:9090
cookie: customCookieName=customCookieValue
accept-encoding: gzip, deflate
content-length: 5416
Connection: keep-alive
cache-control: no-cache
{
    "serialNumber": "请求流水号",
    "payload": "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"
}
// 响应
{"serialNumber":"请求流水号","userId":null,"payload":"7S2VqLu4J6LdW0As50JgZ0eFFoe2FbWytaYdpr2HPg5HhRaHthW1srWmHaa9hz4OR4UWh7YVtbK1ph2mvYc+DkeFFoe2FbWytaYdpr2HPg5HhRaHthW1srWmHaa9hz4OR4UWh7YVtbK1ph2mvYc+DkeFFoe2FbWytaYdpr2HPg5HhRaHthW1srWmHaa9hz4OR4UWh7YVtbK1ph2mvYc+DkeFFoe2FbWytaYdpr2HPg5HhRaHthW1srWmHaa9hz4OR4UWh7YVtbK1ph2mvYc+DkeFFoe2FbWytaYdpr2HPg5HhRaHthW1srWmHaa9hz4OR4UWh7YVtbK1ph2mvYc+DkeFFoe2FbWytaYdpr2HPg5HhRaHthW1srWmHaa9hz4OR4UWh7YVtbK1ph2mvYc+DkeFFoe2FbWytaYdpr2HPg5HhRaHthW1srWmHaa9hz4OR4UWh7YVtbK1ph2mvYc+DkeFFoe2FbWytaYdpr2HPg5HhRaHthW1srWmHaa9hz4OR4UWh7YVtbK1ph2mvYc+DkeFFoe2FbWytaYdpr2HPg5HhRaHthW1srWmHaa9hz4OR4UWh7YVtbK1ph2mvYc+DkeFFoe2FbWytaYdpr2HPg5HhRaHthW1srWmHaa9hz4OR4UWh7YVtbK1ph2mvYc+DkeFFoe2FbWytaYdpr2HPg5HhRaHthW1srWmHaa9hz4OR4UWh7YVtbK1ph2mvYc+DkeFFoe2FbWytaYdpr2HPg5HhRaHthW1srWmHaa9hz4OR4UWh7YVtbK1ph2mvYc+DkeFFoe2FbWytaYdpr2HPg5HhRaHthW1srWmHaa9hz4OR4UWh7YVtbK1ph2mvYc+DkeFFoe2FbWytaYdpr2HPg5HhRaHthW1srWmHaa9hz4OR4UWh7YVtbK1ph2mvYc+DkeFFoe2FbWytaYdpr2HPg5HhRaHthW1srWmHaa9hz4OR4UWh7YVtbK1ph2mvYc+DkeFFoe2FbWytaYdpr2HPg5HhRaHthW1srWmHaa9hz4OR4UWh7YVtbK1ph2mvYc+DkeFFoe2FbWytaYdpr2HPg5HhRaHthW1srWmHaa9hz4OR4UWh7YVtbK1ph2mvYc+DkeFFoe2FbWytaYdpr2HPg5HhRaHthW1srWmHaa9hz4OR4UWh7YVtbK1ph2mvYc+DkeFFoe2FbWytaYdpr2HPg5HhRaHthW1srWmHaa9hz4OR4UWh7YVtbK1ph2mvYc+DkeFFoe2FbWytaYdpr2HPg5HhRaHthW1srWmHaa9hz4OR4UWh7YVtbK1ph2mvYc+DkeFFoe2FbWytaYdpr2HPg5HhRaHthW1srWmHaa9hz4OR4UWh7YVtbK1ph2mvYc+DkeFFoe2FbWytaYdpr2HPg5HhRaHthW1srWmHaa9hz4OR4UWh7YVtbK1ph2mvYc+DkeFFoe2FbWytaYdpr2HPg5HhRaHthW1srWmHaa9hz4OR4UWh7YVtbK1ph2mvYc+DkeFFoe2FbWytaYdpr2HPg5HhRaHthW1srWmHaa9hz4OR4UWh7YVtbK1ph2mvYc+DkeFFoe2FbWytaYdpr2HPg5HhRaHthW1srWmHaa9hz4OR4UWh7YVtbK1ph2mvYc+DkeFFoe2FbWytaYdpr2HPg5HhRaHthW1srWmHaa9hz4OR4UWh7YVtbK1ph2mvYc+DkeFFoe2FbWytaYdpr2HPg5HhRaHthW1srWmHaa9hz4OR4UWh7YVtbK1ph2mvYc+DkeFFoe2FbWytaYdpr2HPg5HhRaHthW1srWmHaa9hz4OR4UWh7YVtbK1ph2mvYc+DkeFFoe2FbWytaYdpr2HPg5HhRaHthW1srWmHaa9hz4OR4UWh7YVtbK1ph2mvYc+DkeFFoe2FbWytaYdpr2HPg5HhRaHthW1srWmHaa9hz4OR4UWh7YVtbK1ph2mvYc+DkeFFoe2FbWytaYdpr2HPg5HhRaHthW1srWmHaa9hz4OR4UWh7YVtbK1ph2mvYc+DkeFFoe2FbWytaYdpr2HPg5HhRaHthW1srWmHaa9hz4OR4UWh7YVtbK1ph2mvYc+DkeFFoe2FbWytaYdpr2HPg5HhRaHthW1srWmHaa9hz4OR4UWh7YVtbK1ph2mvYc+DkeFFoe2FbWytaYdpr2HPg5HhRaHthW1srWmHaa9hz4OR4UWh7YVtbK1ph2mvYc+DkeFFoe2FbWytaYdpr2HPg5HhRaHthW1srWmHaa9hz4OR4UWh7YVtbK1ph2mvYc+DkeFFoe2FbWytaYdpr2HPg5HhRaHthW1srWmHaa9hz4OR4UWh7YVtbK1ph2mvYc+DkeFFoe2FbWytaYdpr2HPg5HhRaHthW1srWmHaa9hz4OR4UWh7YVtbK1ph2mvYc+DkeFFoe2FbWytaYdpr2HPg5HhRaHthW1srWmHaa9hz4OR4UWh7YVtbK1ph2mvYc+DkeFFoe2FbWytaYdpr2HPg5HhRaHthW1srWmHaa9hz4OR4UWh7YVtbK1ph2mvYc+DkeFFoe2FbWytaYdpr2HPg5HhRaHthW1srWmHaa9hz4OR4UWh7YVtbK1ph2mvYc+DkeFFoe2FbWytaYdpr2HPg5HhRaHthW1srWmHaa9hz4OR4UWh7YVtbK1ph2mvYc+DkeFFoe2FbWytaYdpr2HPg5HhRaHthW1srWmHaa9hz4OR4UWh7YVtbK1ph2mvYc+DkeFFoe2FbWytaYdpr2HPg5HhRaHthW1srWmHaa9hz4OR4UWh7YVtbK1ph2mvYc+DkeFFoe2FbWytaYdpr2HPg5HhRaHthW1srWmHaa9hz4OR4UWh7YVtbK1ph2mvYc+DkeFFoe2FbWytaYdpr2HPg5HhRaHthW1srWmHaa9hz4OR4UWh7YVtbK1ph2mvYc+DkeFFoe2FbWytaYdpr2HPg5HhRaHthW1srWmHaa9hz4OR4UWh7YVtbK1ph2mvYc+DkeFFoe2FbWytaYdpr2HPg5HhRaHthW1srWmHaa9hz4OR4UWh7YVtbK1ph2mvYc+DkeFFoe2FbWytaYdpr2HPg5HhRaHthW1srWmHaa9hz4OR4UWh7YVtbK1ph2mvYc+DkeFFoe2FbWytaYdpr2HPg5HhRaHthW1srWmHaa9hz4OR4UWh7YVtbK1ph2mvYc+DkeFFoe2FbWytaYdpr2HPg5HhRaHthW1srWmHaa9hz4OR4UWh7YVtbK1ph2mvYc+DkeFFoe2FbWytaYdpr2HPg5HhRaHthW1srWmHaa9hz4OR4UWh7YVtbK1ph2mvYc+DkeFFoe2FbWytaYdpr2HPg5HhRaHthW1srWmHaa9hz4OR4UWh7YVtbK1ph2mvYc+DkeFFoe2FbWytaYdpr2HPg5HhRaHthW1srWmHaa9hz4OR4UWh7YVtbK1ph2mvYc+DkeFFoe2FbWytaYdpr2HPg5HhRaHthW1srWmHaa9hz4OR4UWh7YVtbK1ph2mvYc+DkeFFoe2FbWytaYdpr2HPg5HhRaHthW1srWmHaa9hz4OR4UWh7YVtbK1ph2mvYc+DkeFFoe2FbWytaYdpr2HPg5HhRaHthW1srWmHaa9hz4OR4UWh7YVtbK1ph2mvYc+DkeFFoe2FbWytaYdpr2HPg5HhRaHthW1srWmHaa9hz4OR4UWh7YVtbK1ph2mvYc+DkeFFoe2FbWytaYdpr2HPg5HhRaHthW1srWmHaa9hz4OR4UWh7YVtbK1ph2mvYc+DkeFFoe2FbWytaYdpr2HPg5HhRaHthW1srWmHaa9hz4OR4UWh7YVtbK1ph2mvYc+DkeFFoe2FbWytaYdpr2HPg5HhRaHthW1srWmHaa9hz4OR4UWh7YVtbK1ph2mvYc+DkeFFoe2FbWytaYdpr2HPg5HhRaHthW1srWmHaa9hz4OR4UWh7YVtbK1ph2mvYc+DkeFFoe2FbWytaYdpr2HPg5HhRaHthW1srWmHaa9hz4OR4UWh7YVtbK1ph2mvYc+DkeFFoe2FbWytaYdpr2HPg5HhRaHthW1srWmHaa9hz4OR4UWh7YVtbK1ph2mvYc+DkeFFoe2FbWytaYdpr2HPg5HhRaHthW1srWmHaa9hz4OR4UWh7YVtbK1ph2mvYc+DkeFFoe2FbWytaYdpr2HPg5HhRaHthW1srWmHaa9hz4OR4UWh7YVtbK1ph2mvYc+DkeFFoe2FbWytaYdpr2HPg5HhRaHthW1srWmHaa9hz4OR4UWh7YVtbK1ph2mvYc+DkeFFoe2FbWytaYdpr2HPg5HhRaHthW1srWmHaa9hz4OR4UWh7YVtbK1ph2mvYc+DkeFFoe2FbWytaYdpr2HPg5HhRaHthW1srWmHaa9hz4OR4UWh7YVtbK1ph2mvYc+DkeFFoe2FbWytaYdpr2HPg5HhRaHthW1srWmHaa9hz4OR4UWh7YVtbK1ph2mvYc+DkeFFoe2FbWytaYdpr2HPg5HhRaHthW1srWmHaa9hz4OR4UWh7YVtbK1ph2mvYc+DkeFFoe2FbWytaYdpr2HPg5HhRaHthW1srWmHaa9hz4OR4UWh7YVtbK1ph2mvYc+DkeFFoe2FbWytaYdpr2HPg5HhRaHthW1srWmHaa9hz4OR4UWh7YVtbK1ph2mvYc+DkeFFoe2FbWytaYdpr2HPg5HhRaHthW1srWmHaa9hz4OR4UWh7YVtbK1ph2mvYc+DkeFFoe2FbWytaYdpr2HPg5HhRaHthW1srWmHaa9hz4OR4UWh7YVtbK1ph2mvYc+DkeFFoe2FbWytaYdpr2HPg5HhRaHthW1srWmHaa9hz4OR4UWh7YVtbK1ph2mvYc+DkeFFoe2FbWytaYdpr2HPg5HhRaHthW1srWmHaa9hz4OR4UWh7YVtbK1ph2mvYc+DkeFFoe2FbWytaYdpr2HPg5HhRaHthW1srWmHaa9hz4OR4UWh7YVtbK1ph2mvYc+DkeFFoe2FbWytaYdpr2HPg5HhRaHthW1srWmHaa9hz4OR4UWh7YVtbK1ph2mvYc+DkeFFoe2FbWytaYdpr2HPg5HhRaHthW1srWmHaa9hz4OR4UWh7YVtbK1ph2mvYc+DkeFFoe2FbWytaYdpr2HPg5HhRaHthW1srWmHaa9hz4OR4UWh7YVtbK1ph2mvYc+DkeFFoe2FbWytaYdpr2HPg5HhRaHthW1srWmHaa9hz4OR4UWh7YVtbK1ph2mvYc+DkeFFoe2FbWytaYdpr2HPg5HhRaHthW1srWmHaa9hz4OR4UWh7YVtbK1ph2mvYc+DkeFFoe2FbWytaYdpr2HPg5HhRaHthW1srWmHaa9hz4OR4UWh7YVtbK1ph2mvYc+Dm8rTVHylECORYnLNgnfWx0ENJ9a6E+abYhyFJ9zSIda"}
复制代码

彻底解决了之前的请求或者响应报文截断的问题，笔者发现了很多博文都在(照搬)更改读取DataBuffer实例时候的代码逻辑，其实那段逻辑是不相关的，可以尝试用BufferedReader基于行读取然后用StringBuilder承载，或者像本文那样直接读取为byte数组等等，因为根本的原因是底层的Reactor-Netty的数据块读取大小限制导致获取到的DataBuffer实例里面的数据是不完整的，解决方案就是参照Spring Cloud Gateway本身提供的基础类库进行改造(暂时没发现有入口可以调整Reactor-Netty的配置)，难度也不大。

小结

刚好遇到一个需求需要做网关的加解密包括请求体和响应体的修改，这里顺便把Spring Cloud Gateway一些涉及到这方面的一些内容梳理了一遍，顺便把坑踩了并且填完。下一步尝试按照目前官方提供的可用组件修改一下实现自定义的逻辑，包括Hystrix、基于Eureka和Ribbon的负载均衡、限流等等。

Spring Cloud Gateway-ServerWebExchange核心方法与请求或者响应内容的修改（下）

修改响应体

请求体或者响应体报文过大的问题

小结

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