feat: FCM 토큰 등록/삭제 API 추가

Author: JangInho

src/main/java/com/semosan/api/domain/notification/controller/FcmTokenController.java

@@ -0,0 +1,41 @@
+package com.semosan.api.domain.notification.controller;
+
+import com.semosan.api.common.response.ApiResponse;
+import com.semosan.api.common.status.SuccessStatus;
+import com.semosan.api.domain.notification.dto.FcmTokenDeleteRequest;
+import com.semosan.api.domain.notification.dto.FcmTokenRegisterRequest;
+import com.semosan.api.domain.notification.service.FcmTokenService;
+import jakarta.validation.Valid;
+import lombok.RequiredArgsConstructor;
+import org.springframework.http.ResponseEntity;
+import org.springframework.security.core.annotation.AuthenticationPrincipal;
+import org.springframework.web.bind.annotation.DeleteMapping;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.RequestBody;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+@RestController
+@RequestMapping("/api/fcm")
+@RequiredArgsConstructor
+public class FcmTokenController {
+
+    private final FcmTokenService fcmTokenService;
+
+    @PostMapping("/tokens")
+    public ResponseEntity<ApiResponse<Void>> register(
+            @AuthenticationPrincipal Long userId,
+            @Valid @RequestBody FcmTokenRegisterRequest request
+    ) {
+        fcmTokenService.register(userId, request.token(), request.deviceType());
+        return ApiResponse.success(SuccessStatus.FCM_TOKEN_REGISTER_SUCCESS);
+    }
+
+    @DeleteMapping("/tokens")
+    public ResponseEntity<ApiResponse<Void>> delete(
+            @Valid @RequestBody FcmTokenDeleteRequest request
+    ) {
+        fcmTokenService.delete(request.token());
+        return ApiResponse.success(SuccessStatus.FCM_TOKEN_DELETE_SUCCESS);
+    }
+}

src/main/java/com/semosan/api/domain/notification/dto/FcmTokenDeleteRequest.java

@@ -0,0 +1,8 @@
+package com.semosan.api.domain.notification.dto;
+
+import jakarta.validation.constraints.NotBlank;
+
+public record FcmTokenDeleteRequest(
+        @NotBlank String token
+) {
+}

src/main/java/com/semosan/api/domain/notification/dto/FcmTokenRegisterRequest.java

@@ -0,0 +1,11 @@
+package com.semosan.api.domain.notification.dto;
+
+import com.semosan.api.domain.user.enums.DeviceType;
+import jakarta.validation.constraints.NotBlank;
+import jakarta.validation.constraints.NotNull;
+
+public record FcmTokenRegisterRequest(
+        @NotBlank String token,
+        @NotNull DeviceType deviceType
+) {
+}

src/main/java/com/semosan/api/domain/notification/service/FcmTokenService.java

@@ -0,0 +1,38 @@
+package com.semosan.api.domain.notification.service;
+
+import com.semosan.api.domain.notification.entity.FcmToken;
+import com.semosan.api.domain.notification.repository.FcmTokenRepository;
+import com.semosan.api.domain.user.enums.DeviceType;
+import lombok.RequiredArgsConstructor;
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
+
+@Slf4j
+@Service
+@RequiredArgsConstructor
+public class FcmTokenService {
+
+    private final FcmTokenRepository fcmTokenRepository;
+
+    /**
+     * 토큰 등록
+     * 같은 토큰이 이미 있으면 (다른 유저로 로그인 등) 소유자/디바이스 갱신
+     */
+    @Transactional
+    public void register(Long userId, String token, DeviceType deviceType) {
+        fcmTokenRepository.findByToken(token).ifPresentOrElse(
+                existing -> existing.reassignTo(userId, deviceType),
+                () -> fcmTokenRepository.save(FcmToken.create(userId, token, deviceType))
+        );
+    }
+
+    /**
+     * 토큰 삭제
+     * 로그아웃 시 호출하면 될 듯
+     */
+    @Transactional
+    public void delete(String token) {
+        fcmTokenRepository.deleteByToken(token);
+    }
+}

src/main/java/com/semosan/api/domain/user/entity/User.java

@@ -63,6 +63,8 @@ public class User extends BaseEntity {
     @Column(name = "weight")
     private Double weight;
 
+    // 이거 삭제해야할 듯 -> fcm_tokens 테이블을 따로 뺌
+    // 충돌날까봐 아직 건드리진 않음
     @Column(name = "fcm_token", length = 255)
     private String fcmToken;