feat: create RequestBodyCachingFilter

photo-service/src/main/java/kr/mafoo/photo/config/RequestBodyCachingFilter.java

@@ -0,0 +1,46 @@
+package kr.mafoo.photo.config;
+
+import org.springframework.core.io.buffer.DataBuffer;
+import org.springframework.core.io.buffer.DataBufferUtils;
+import org.springframework.http.server.reactive.ServerHttpRequest;
+import org.springframework.http.server.reactive.ServerHttpRequestDecorator;
+import org.springframework.stereotype.Component;
+import org.springframework.web.server.ServerWebExchange;
+import org.springframework.web.server.ServerWebExchangeDecorator;
+import org.springframework.web.server.WebFilter;
+import org.springframework.web.server.WebFilterChain;
+import reactor.core.publisher.Flux;
+import reactor.core.publisher.Mono;
+
+@Component
+public class RequestBodyCachingFilter implements WebFilter {
+
+    // TODO: 추후 정리 필요
+
+    @Override
+    public Mono<Void> filter(ServerWebExchange exchange, WebFilterChain chain) {
+        return DataBufferUtils.join(exchange.getRequest().getBody())
+                .flatMap(dataBuffer -> {
+                    byte[] bytes = new byte[dataBuffer.readableByteCount()];
+                    dataBuffer.read(bytes);
+                    DataBufferUtils.release(dataBuffer);
+
+                    ServerHttpRequestDecorator decoratedRequest = new ServerHttpRequestDecorator(exchange.getRequest()) {
+                        @Override
+                        public Flux<DataBuffer> getBody() {
+                            return Flux.just(exchange.getResponse().bufferFactory().wrap(bytes));
+                        }
+                    };
+
+                    ServerWebExchangeDecorator decoratedExchange = new ServerWebExchangeDecorator(exchange) {
+                        @Override
+                        public ServerHttpRequest getRequest() {
+                            return decoratedRequest;
+                        }
+                    };
+
+                    return chain.filter(decoratedExchange);
+                });
+    }
+}
+