feat: application/octet-stream 변환로직 추가

backend/src/main/java/org/example/backend/global/config/web/WebConfig.java

@@ -1,19 +1,34 @@
 package org.example.backend.global.config.web;
 
+import org.example.backend.global.util.OctetStreamReadMsgConverter;
+import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.context.annotation.Configuration;
-import org.springframework.web.method.support.HandlerMethodArgumentResolver;
+import org.springframework.http.converter.HttpMessageConverter;
 import org.springframework.web.servlet.config.annotation.CorsRegistry;
 import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
 
 import java.util.List;
 
+
 @Configuration
 public class WebConfig implements WebMvcConfigurer {
+    private OctetStreamReadMsgConverter octetStreamReadMsgConverter;
+
+    @Autowired
+    public WebConfig(OctetStreamReadMsgConverter octetStreamReadMsgConverter) {
+        this.octetStreamReadMsgConverter = octetStreamReadMsgConverter;
+    }
+
+    @Override
+    public void extendMessageConverters(List<HttpMessageConverter<?>> converters) {
+        converters.add(octetStreamReadMsgConverter);
+    }
+
     @Override
     public void addCorsMappings(CorsRegistry corsRegistry) {
 
         corsRegistry.addMapping("/**")
                 .allowedOrigins("http://localhost:3000",
-                                "http://sejong-bioconvergence-temp.s3-website.ap-northeast-2.amazonaws.com");
+                        "http://sejong-bioconvergence-temp.s3-website.ap-northeast-2.amazonaws.com");
     }
 }

backend/src/main/java/org/example/backend/global/util/OctetStreamReadMsgConverter.java

@@ -0,0 +1,33 @@
+package org.example.backend.global.util;
+
+import com.fasterxml.jackson.databind.ObjectMapper;
+import java.lang.reflect.Type;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.http.MediaType;
+import org.springframework.http.converter.json.AbstractJackson2HttpMessageConverter;
+import org.springframework.stereotype.Component;
+
+@Component
+public class OctetStreamReadMsgConverter extends AbstractJackson2HttpMessageConverter {
+    @Autowired
+    public OctetStreamReadMsgConverter(ObjectMapper objectMapper) {
+        super(objectMapper, MediaType.APPLICATION_OCTET_STREAM);
+    }
+
+    // 기존 application/octet-stream 타입을 쓰기로 다루는 메시지 컨버터가 이미 존재 (ByteArrayHttpMessageConverter)
+    // 따라서 해당 컨버터는 쓰기 작업에는 이용하면 안됨
+    @Override
+    public boolean canWrite(Class<?> clazz, MediaType mediaType) {
+        return false;
+    }
+
+    @Override
+    public boolean canWrite(Type type, Class<?> clazz, MediaType mediaType) {
+        return false;
+    }
+
+    @Override
+    protected boolean canWrite(MediaType mediaType) {
+        return false;
+    }
+}