fix: InputStreamResource를 ByteArrayResource로 변경하여 스트림 재사용 문제 해결

- InputStreamResource는 한 번만 읽을 수 있어 Content-Length 계산과 실제 요청 시 문제 발생
- ByteArrayResource로 변경하여 여러 번 읽기 가능하도록 수정

src/main/java/notai/client/ai/AiClient.java

@@ -2,7 +2,7 @@
 
 import notai.client.ai.request.LlmTaskRequest;
 import notai.client.ai.response.TaskResponse;
-import org.springframework.core.io.InputStreamResource;
+import org.springframework.core.io.ByteArrayResource;
 import org.springframework.http.MediaType;
 import org.springframework.web.bind.annotation.RequestBody;
 import org.springframework.web.bind.annotation.RequestPart;
@@ -14,5 +14,5 @@ public interface AiClient {
     TaskResponse submitLlmTask(@RequestBody LlmTaskRequest request);
 
     @PostExchange(url = "/api/ai/stt", contentType = MediaType.MULTIPART_FORM_DATA_VALUE)
-    TaskResponse submitSttTask(@RequestPart("audio") InputStreamResource audioFile);
+    TaskResponse submitSttTask(@RequestPart("audio") ByteArrayResource audioFile);
 }

src/main/java/notai/stt/application/SttTaskService.java

@@ -15,13 +15,13 @@
 import notai.stt.domain.SttRepository;
 import notai.sttTask.domain.SttTask;
 import notai.sttTask.domain.SttTaskRepository;
-import org.springframework.core.io.InputStreamResource;
+import org.springframework.core.io.ByteArrayResource;
 import org.springframework.stereotype.Service;
 import org.springframework.transaction.annotation.Transactional;
 
 import java.io.File;
-import java.io.FileInputStream;
 import java.io.IOException;
+import java.nio.file.Files;
 
 @Service
 @Transactional
@@ -36,8 +36,10 @@ public void submitSttTask(SttRequestCommand command) {
         Recording recording = recordingRepository.getById(command.recordingId());
         File audioFile = validateAudioFile(command.audioFilePath());
 
-        try (FileInputStream fileInputStream = new FileInputStream(audioFile)) {
-            InputStreamResource resource = new InputStreamResource(fileInputStream) {
+        try {
+            byte[] audioBytes = Files.readAllBytes(audioFile.toPath());
+
+            ByteArrayResource resource = new ByteArrayResource(audioBytes) {
                 @Override
                 public String getFilename() {
                     return audioFile.getName();