[UPDATE] signup 로직 변경

src/main/java/kr/re/etri/security/jwt/controllers/AuthController.java

@@ -109,46 +109,44 @@ public class AuthController {
   @PostMapping("/signup")
   public ResponseEntity<?> registerUser(@Valid @RequestBody SignupRequest signUpRequest) {
     if (userRepository.existsByUsername(signUpRequest.getUsername())) {
-      return ResponseEntity.badRequest().body(new MessageResponse("Error: Username is already taken!"));
+      return ResponseEntity.badRequest().body(new MessageResponse("오류: 이미 사용 중인 사용자 이름입니다."));
     }
     if (userRepository.existsByEmail(signUpRequest.getEmail())) {
-      return ResponseEntity.badRequest().body(new MessageResponse("Error: Email is already in use!"));
+      return ResponseEntity.badRequest().body(new MessageResponse("오류: 이미 사용 중인 이메일입니다."));
     }
 
-    User user = new User(signUpRequest.getUsername(), signUpRequest.getEmail(),
-            encoder.encode(signUpRequest.getPassword()));
+    User user = new User(
+            signUpRequest.getUsername(),
+            signUpRequest.getEmail(),
+            encoder.encode(signUpRequest.getPassword())
+    );
 
     Set<String> strRoles = signUpRequest.getRole();
     Set<Role> roles = new HashSet<>();
 
-    if (strRoles == null) {
-      Role userRole = roleRepository.findByName(ERole.ROLE_USER)
-              .orElseThrow(() -> new RuntimeException("Error: Role is not found."));
-      roles.add(userRole);
-    } else {
-      strRoles.forEach(role -> {
-        switch (role) {
-          case "admin":
-            roles.add(roleRepository.findByName(ERole.ROLE_ADMIN)
-                    .orElseThrow(() -> new RuntimeException("Error: Role is not found.")));
-            break;
-          case "mod":
-            roles.add(roleRepository.findByName(ERole.ROLE_MODERATOR)
-                    .orElseThrow(() -> new RuntimeException("Error: Role is not found.")));
-            break;
-          default:
-            roles.add(roleRepository.findByName(ERole.ROLE_USER)
-                    .orElseThrow(() -> new RuntimeException("Error: Role is not found.")));
+    if (strRoles == null || strRoles.isEmpty()) {
+      strRoles = Set.of("ROLE_USER");
+    }
+
+    for (String roleName : strRoles) {
+      try {
+        ERole eRole = ERole.valueOf(roleName);
+        Role role = roleRepository.findByName(eRole)
+                .orElseThrow(() -> new RuntimeException("오류: '" + roleName + "' 역할이 DB에 존재하지 않습니다."));
+        roles.add(role);
+      } catch (IllegalArgumentException e) {
+        return ResponseEntity.badRequest().body(new MessageResponse("오류: '" + roleName + "' 역할은 유효하지 않습니다."));
       }
-      });
     }
 
     user.setRoles(roles);
     userRepository.save(user);
 
-    return ResponseEntity.ok(new MessageResponse("User registered successfully!"));
+    return ResponseEntity.ok(new MessageResponse("사용자 등록이 완료되었습니다."));
   }
 
+
+
   @Operation(summary = "로그아웃", description = "현재 사용자를 로그아웃하고 쿠키 및 리프레시 토큰을 삭제합니다.")
   @ApiResponses({
           @ApiResponse(responseCode = "200", description = "로그아웃 성공")