feat:레슨생성시쿨타임제한추가

Author: iamjieunkim

src/main/java/com/threestar/trainus/domain/lesson/teacher/service/AdminLessonService.java

@@ -51,11 +51,15 @@ public class AdminLessonService {
 	private final LessonImageRepository lessonImageRepository;
 	private final LessonApplicationRepository lessonApplicationRepository;
 	private final UserService userService;
+	private final LessonCreationLimitService lessonCreationLimitService;
 
 	//레슨 생성
 	public LessonResponseDto createLesson(LessonCreateRequestDto requestDto, Long userId) {
 		User user = userService.getUserById(userId);
 
+		//레슨 생성 제한 확인 및 쿨타임 설정
+		lessonCreationLimitService.checkAndSetCreationLimit(userId);
+
 		// 생성시에 필요한 검증을 진행
 		validateLessonCreation(requestDto, userId);
 
@@ -146,7 +150,7 @@ public ParticipantListResponseDto getLessonParticipants(
 
 		Page<LessonApplication> participantPage = lessonApplicationRepository
 			.findApprovedParticipantsWithUserAndProfile(lesson, pageable);
-		
+
 		return LessonParticipantMapper.toParticipantsResponseDto(
 			participantPage.getContent(),
 			participantPage.getTotalElements()

src/main/java/com/threestar/trainus/domain/lesson/teacher/service/LessonCreationLimitService.java

@@ -0,0 +1,51 @@
+package com.threestar.trainus.domain.lesson.teacher.service;
+
+import java.time.Duration;
+
+import org.springframework.data.redis.core.RedisTemplate;
+import org.springframework.stereotype.Service;
+
+import com.threestar.trainus.global.exception.domain.ErrorCode;
+import com.threestar.trainus.global.exception.handler.BusinessException;
+
+import lombok.RequiredArgsConstructor;
+import lombok.extern.slf4j.Slf4j;
+
+/**
+ * 레슨 생성 제한 서비스
+ * Redis를 사용해 강사의 레슨 생성에 쿨타임을 적용 ->1분
+ */
+@Slf4j
+@Service
+@RequiredArgsConstructor
+public class LessonCreationLimitService {
+
+	private final RedisTemplate<String, String> redisTemplate;
+
+	// 레슨 생성 쿨타임 (1분)
+	private static final Duration CREATION_COOLTIME = Duration.ofMinutes(1);
+
+	//redis 키 접두사
+	private static final String LESSON_CREATION_KEY_PREFIX = "lesson_creation_limit:";
+
+	//레슨 생성 가능 여부 확인 + 쿨타임 설정
+	public void checkAndSetCreationLimit(Long userId) {
+		String key = generateRedisKey(userId);
+
+		// 이미 쿨타임이 설정되어 있는지 확인
+		if (redisTemplate.hasKey(key)) {
+			Long remainingTtl = redisTemplate.getExpire(key);
+			log.info("레슨 생성 제한 - 사용자 ID: {}, 남은 시간: {}초", userId, remainingTtl);
+			throw new BusinessException(ErrorCode.LESSON_CREATION_TOO_FREQUENT);
+		}
+
+		// 쿨타임 설정
+		redisTemplate.opsForValue().set(key, "restricted", CREATION_COOLTIME);
+		log.info("레슨 생성 쿨타임 설정 - 사용자 ID: {}, 지속시간: {}분", userId, CREATION_COOLTIME.toMinutes());
+	}
+
+	// Redis 키를 생성
+	private String generateRedisKey(Long userId) {
+		return LESSON_CREATION_KEY_PREFIX + userId;
+	}
+}

src/main/java/com/threestar/trainus/global/exception/domain/ErrorCode.java

@@ -77,6 +77,7 @@ public enum ErrorCode {
 	LESSON_DELETE_STATUS_INVALID(HttpStatus.BAD_REQUEST, "모집중인 레슨만 삭제할 수 있습니다."),
 	LESSON_DELETE_HAS_PARTICIPANTS(HttpStatus.BAD_REQUEST, "참가자가 있는 레슨은 삭제할 수 없습니다."),
 	LESSON_TIME_LIMIT_EXCEEDED(HttpStatus.BAD_REQUEST, "레슨 시작 12시간 전이므로 수정/삭제할 수 없습니다."),
+	LESSON_CREATION_TOO_FREQUENT(HttpStatus.TOO_MANY_REQUESTS, "레슨 생성은 1분에 1번만 가능합니다. 잠시 후 다시 시도해주세요."),
 
 	// 403 Forbidden
 	LESSON_DELETE_FORBIDDEN(HttpStatus.FORBIDDEN, "레슨 삭제 권한이 없습니다. 강사만 삭제할 수 있습니다."),

src/test/java/com/threestar/trainus/domain/lesson/teacher/service/LessonCreationLimitServiceTest.java

@@ -0,0 +1,64 @@
+package com.threestar.trainus.domain.lesson.teacher.service;
+
+import static org.assertj.core.api.Assertions.*;
+import static org.mockito.Mockito.*;
+
+import java.time.Duration;
+
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.mockito.InjectMocks;
+import org.mockito.Mock;
+import org.mockito.junit.jupiter.MockitoExtension;
+import org.springframework.data.redis.core.RedisTemplate;
+import org.springframework.data.redis.core.ValueOperations;
+
+import com.threestar.trainus.global.exception.domain.ErrorCode;
+import com.threestar.trainus.global.exception.handler.BusinessException;
+
+@ExtendWith(MockitoExtension.class)
+class LessonCreationLimitServiceTest {
+	@Mock
+	private RedisTemplate<String, String> redisTemplate;
+
+	@Mock
+	private ValueOperations<String, String> valueOperations;
+
+	@InjectMocks
+	private LessonCreationLimitService lessonCreationLimitService;
+
+	@Test
+	@DisplayName("첫 레슨 생성 시 제한 없이 성공한다")
+	void checkAndSetCreationLimit_FirstTime_Success() {
+		Long userId = 1L;
+		String expectedKey = "lesson_creation_limit:" + userId;
+
+		when(redisTemplate.hasKey(expectedKey)).thenReturn(false);
+		when(redisTemplate.opsForValue()).thenReturn(valueOperations);
+
+		assertThatCode(() -> lessonCreationLimitService.checkAndSetCreationLimit(userId))
+			.doesNotThrowAnyException();
+
+		verify(redisTemplate).hasKey(expectedKey);
+		verify(valueOperations).set(expectedKey, "restricted", Duration.ofMinutes(1));
+	}
+
+	@Test
+	@DisplayName("쿨타임이 남아있을 때 레슨 생성을 제한한다")
+	void checkAndSetCreationLimit_WithinCooltime_ThrowsException() {
+		Long userId = 1L;
+		String expectedKey = "lesson_creation_limit:" + userId;
+
+		when(redisTemplate.hasKey(expectedKey)).thenReturn(true);
+		when(redisTemplate.getExpire(expectedKey)).thenReturn(30L); // 30초 남음
+
+		assertThatThrownBy(() -> lessonCreationLimitService.checkAndSetCreationLimit(userId))
+			.isInstanceOf(BusinessException.class)
+			.extracting(e -> ((BusinessException)e).getErrorCode())
+			.isEqualTo(ErrorCode.LESSON_CREATION_TOO_FREQUENT);
+
+		verify(redisTemplate).hasKey(expectedKey);
+		verify(redisTemplate, never()).opsForValue();
+	}
+}