refactor: Lecture 일부 코드 리팩토링

backend/src/main/java/com/edufocus/edufocus/lecture/controller/LectureController.java

@@ -30,8 +30,15 @@ public class LectureController {
     public ResponseEntity<?> createLecture(@RequestHeader("Authorization") String accessToken, @RequestBody LectureCreateRequest lectureCreateRequest) {
         Long userId = Long.parseLong(jwtUtil.getUserId(accessToken));
 
+        Lecture lecture = lectureService.findLectureByTitle(lectureCreateRequest.getTitle());
+        if (lecture != null) {
+            String msg = new String("Duplicated Lecture");
+            return new ResponseEntity<>(msg, HttpStatus.CONFLICT);
+        }
+
         lectureService.createLecture(userId, lectureCreateRequest);
-        return new ResponseEntity<>(HttpStatus.CREATED);
+        String msg = new String("Lecture registered successfully");
+        return new ResponseEntity<>(msg, HttpStatus.CREATED);
     }
 
     @PutMapping("/{lectureId}")
@@ -39,17 +46,21 @@ public class LectureController {
         Long userId = Long.parseLong(jwtUtil.getUserId(accessToken));
 
         if (!lectureService.updateLecture(userId, lectureId, lectureCreateRequest)) {
-            return new ResponseEntity<>(HttpStatus.BAD_REQUEST);
+            String msg = new String("Can't update Lecture");
+            return new ResponseEntity<>(msg, HttpStatus.UNAUTHORIZED);
         }
-
+        String msg = new String("Lecture updated successfully");
-        return new ResponseEntity<>(HttpStatus.OK);
+        return new ResponseEntity<>(msg, HttpStatus.OK);
     }
 
 
     @DeleteMapping("/{lectureId}")
-    public ResponseEntity<?> deleteLecture(@RequestBody long userId, @PathVariable long lectureId) {
+    public ResponseEntity<?> deleteLecture(@RequestHeader("Authorization") String accessToken, @PathVariable long lectureId) {
+        Long userId = Long.parseLong(jwtUtil.getUserId(accessToken));
+
         if (!lectureService.deleteLecture(userId, lectureId)) {
-            return new ResponseEntity<>(HttpStatus.NOT_FOUND);
+            String msg = new String("Can't delete Lecture");
+            return new ResponseEntity<>(msg, HttpStatus.UNAUTHORIZED);
         }
 
         return new ResponseEntity<>(HttpStatus.NO_CONTENT);
@@ -60,7 +71,8 @@ public class LectureController {
         List<LectureSearchResponse> lectures = lectureService.findAllLecture();
 
         if (lectures.isEmpty()) {
-            return new ResponseEntity<>(HttpStatus.NO_CONTENT);
+            String msg = new String("No lectures found");
+            return new ResponseEntity<>(msg, HttpStatus.OK);
         }
 
         return new ResponseEntity<>(lectures, HttpStatus.OK);
@@ -77,22 +89,28 @@ public class LectureController {
         LectureDetailResponse lectureDetailResponse = lectureService.findLectureById(userId, lectureId);
 
         if (lectureDetailResponse == null) {
-            return new ResponseEntity<>(HttpStatus.NO_CONTENT);
+            String msg = new String("Can't find Lecture");
+            return new ResponseEntity<>(msg, HttpStatus.OK);
         }
 
 
-
         return new ResponseEntity<>(lectureDetailResponse, HttpStatus.OK);
     }
 
     @GetMapping("/mylecture")
-    public ResponseEntity<?> findMyLecture(@RequestHeader("Authorization") String accessToken) {
+    public ResponseEntity<?> findMyLecture(@RequestHeader(value = "Authorization", required = false) String accessToken) {
+        if (accessToken == null) {
+            String msg = new String("Not logged in");
+            return new ResponseEntity<>(msg, HttpStatus.OK);
+        }
+
         Long userId = Long.parseLong(jwtUtil.getUserId(accessToken));
 
         List<LectureSearchResponse> myLectures = lectureService.findMyLecture(userId);
 
         if (myLectures.isEmpty()) {
-            return new ResponseEntity<>(HttpStatus.NO_CONTENT);
+            String msg = new String("No lectures found");
+            return new ResponseEntity<>(msg, HttpStatus.OK);
         }
 
         return new ResponseEntity<>(myLectures, HttpStatus.OK);

backend/src/main/java/com/edufocus/edufocus/lecture/service/LectureService.java

@@ -1,5 +1,6 @@
 package com.edufocus.edufocus.lecture.service;
 
+import com.edufocus.edufocus.lecture.entity.Lecture;
 import com.edufocus.edufocus.lecture.entity.LectureCreateRequest;
 import com.edufocus.edufocus.lecture.entity.LectureSearchResponse;
 import com.edufocus.edufocus.lecture.entity.LectureDetailResponse;
@@ -23,4 +24,5 @@ public interface LectureService {
 
     List<LectureSearchResponse> findMyLecture(long userId);
 
+    Lecture findLectureByTitle(String title);
 }

backend/src/main/java/com/edufocus/edufocus/lecture/service/LectureServiceImpl.java

@@ -15,6 +15,7 @@ import org.springframework.stereotype.Service;
 
 import java.util.ArrayList;
 import java.util.List;
+import java.util.Optional;
 
 @Builder
 @Service
@@ -47,11 +48,9 @@ public class LectureServiceImpl implements LectureService {
 
     @Override
     public boolean updateLecture(long userId, long lectureId, LectureCreateRequest lectureCreateRequest) {
-        User user = userRepository.findById(userId).get();
-
         Lecture lecture = lectureRepository.findById(lectureId).get();
 
-        if (lecture.getUser().getId() != user.getId()) {
+        if (lecture.getUser().getId() != userId) {
             return false;
         }
 
@@ -80,9 +79,14 @@ public class LectureServiceImpl implements LectureService {
 
     @Override
     public boolean deleteLecture(long userId, long lectureId) {
-        Lecture lecture = lectureRepository.findById(lectureId).get();
+        Optional<Lecture> lecture = lectureRepository.findById(lectureId);
 
-        if (lecture.getUser().getId() != userId) {
+        if (lecture.isEmpty()) {
+            return false;
+        }
+        lecture = Optional.of(lecture.get());
+
+        if (lecture.get().getUser().getId() != userId) {
             return false;
         }
 
@@ -109,11 +113,12 @@ public class LectureServiceImpl implements LectureService {
 
     @Override
     public LectureDetailResponse findLectureById(Long userId, long lectureId) {
-        Lecture lecture = lectureRepository.findById(lectureId).get();
+        Optional<Lecture> lecture = lectureRepository.findById(lectureId);
 
-        if (lecture == null) {
+        if (lecture.isEmpty()) {
             return null;
         }
+        lecture = Optional.of(lecture.get());
 
         String userStatus;
         if (userId == null) {
@@ -122,9 +127,9 @@ public class LectureServiceImpl implements LectureService {
             User user = userRepository.findById(userId).get();
 
             if (user.getRole() == UserRole.ADMIN) {
-                if (lecture.getUser().getId() == user.getId()) {
+                if (lecture.get().getUser().getId() == user.getId()) {
                     userStatus = String.valueOf(UserStatus.MANAGED_BY_ME);
-                } else{
+                } else {
                     userStatus = String.valueOf(UserStatus.MANAGED_BY_OTHERS);
                 }
             } else {
@@ -141,15 +146,15 @@ public class LectureServiceImpl implements LectureService {
         }
 
         LectureDetailResponse lectureDetailResponse = new LectureDetailResponse().builder()
-                .id(lecture.getId())
+                .id(lecture.get().getId())
-                .title(lecture.getTitle())
+                .title(lecture.get().getTitle())
-                .description(lecture.getDescription())
+                .description(lecture.get().getDescription())
-                .image(lecture.getImage())
+                .image(lecture.get().getImage())
-                .startDate(lecture.getStartDate())
+                .startDate(lecture.get().getStartDate())
-                .endDate(lecture.getEndDate())
+                .endDate(lecture.get().getEndDate())
-                .plan(lecture.getPlan())
+                .plan(lecture.get().getPlan())
-                .online(lecture.isOnline())
+                .online(lecture.get().isOnline())
-                .teacherName(lecture.getUser().getName())
+                .teacherName(lecture.get().getUser().getName())
                 .status(userStatus)
                 .build();
 
@@ -189,4 +194,8 @@ public class LectureServiceImpl implements LectureService {
         return myLectureList;
     }
 
+    @Override
+    public Lecture findLectureByTitle(String title) {
+        return lectureRepository.findByTitle(title);
+    }
 }