[FEAT]/#70-FCM을 이용한 푸시알림 생성과 디바이스 정보 저장 로직 구현

src/main/java/org/example/tree/global/common/fcm/dto/FCMRequestDTO.java

@@ -0,0 +1,24 @@
+package org.example.tree.global.common.fcm.dto;
+
+import lombok.AccessLevel;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+
+@NoArgsConstructor(access = AccessLevel.PRIVATE)
+
+public class FCMRequestDTO {
+
+    @Getter
+    public static class sendFCM {
+        private String title;
+        private String message;
+        private String receiverId;
+    }
+
+    @Getter
+    public static class saveDevice {
+        private String deviceUuid;
+        private String fcmToken;
+        private String userId;
+    }
+}

src/main/java/org/example/tree/global/common/fcm/entity/FCMDevice.java

@@ -0,0 +1,28 @@
+package org.example.tree.global.common.fcm.entity;
+
+import jakarta.persistence.Entity;
+import jakarta.persistence.GeneratedValue;
+import jakarta.persistence.GenerationType;
+import jakarta.persistence.Id;
+import lombok.AllArgsConstructor;
+import lombok.Builder;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+
+@Builder
+@Getter
+@NoArgsConstructor
+@AllArgsConstructor
+@Entity
+public class FCMDevice {
+
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    private Long id;
+
+    private String deviceUuid;
+
+    private String fcmToken;
+
+    private String userId;
+}

src/main/java/org/example/tree/global/common/fcm/repository/FCMDeviceRepository.java

@@ -0,0 +1,8 @@
+package org.example.tree.global.common.fcm.repository;
+
+import org.example.tree.global.common.fcm.entity.FCMDevice;
+import org.springframework.data.jpa.repository.JpaRepository;
+
+public interface FCMDeviceRepository extends JpaRepository<FCMDevice, Long> {
+    FCMDevice findByDeviceUuid(String deviceUuid);
+}

src/main/java/org/example/tree/global/common/fcm/service/FCMDeviceService.java

@@ -0,0 +1,23 @@
+package org.example.tree.global.common.fcm.service;
+
+import lombok.RequiredArgsConstructor;
+import org.example.tree.global.common.fcm.dto.FCMRequestDTO;
+import org.example.tree.global.common.fcm.entity.FCMDevice;
+import org.example.tree.global.common.fcm.repository.FCMDeviceRepository;
+import org.springframework.stereotype.Service;
+
+@Service
+@RequiredArgsConstructor
+public class FCMDeviceService {
+
+    FCMDeviceRepository fcmDeviceRepository;
+
+    public Long saveDevice(FCMRequestDTO.saveDevice request) {
+        FCMDevice fcmDevice = FCMDevice.builder()
+                .deviceUuid(request.getDeviceUuid())
+                .fcmToken(request.getFcmToken())
+                .userId(request.getUserId())
+                .build();
+        return fcmDeviceRepository.save(fcmDevice).getId();
+    }
+}

src/main/java/org/example/tree/global/common/fcm/service/FCMService.java

@@ -0,0 +1,65 @@
+package org.example.tree.global.common.fcm.service;
+
+import com.google.firebase.messaging.*;
+import lombok.RequiredArgsConstructor;
+import lombok.extern.slf4j.Slf4j;
+import org.example.tree.global.common.fcm.entity.FCMDevice;
+import org.example.tree.global.common.fcm.repository.FCMDeviceRepository;
+import org.springframework.stereotype.Service;
+
+@Slf4j
+@Service
+@RequiredArgsConstructor
+public class FCMService {
+
+    private final FCMDeviceRepository fcmDeviceRepository;
+    public static final String PUSH_CLICK = "push_click";
+
+    public String send(String deviceUuid, String title, String body) {
+        FCMDevice targetUser = fcmDeviceRepository.findByDeviceUuid(deviceUuid);
+
+        Message message = buildFcmMessage(title, body, targetUser.getFcmToken());
+        try {
+            String response = FirebaseMessaging.getInstance().send(message);
+            log.info("FCM-send-" + response);
+        } catch (FirebaseMessagingException e) {
+            log.info("FCM-except-" + e.getMessage());
+            return "알림 실패";
+        }
+        return "알림 전송";
+    }
+
+    private Message buildFcmMessage(String title, String body, String token) {
+        return Message.builder()
+                .setToken(token)
+                .setNotification(
+                        Notification.builder()
+                                .setTitle(title)
+                                .setBody(body)
+                                .build()
+                )
+                .setAndroidConfig(buildAndroidConfig(title, body))
+                .setApnsConfig(buildApnsConfig())
+                .build();
+    }
+
+    private AndroidConfig buildAndroidConfig(String title, String body) {
+        return AndroidConfig.builder()
+                .setNotification(
+                        AndroidNotification.builder()
+                                .setTitle(title)
+                                .setBody(body)
+                                .setClickAction(PUSH_CLICK)
+                                .build()
+                )
+                .build();
+    }
+
+    private ApnsConfig buildApnsConfig() {
+        return ApnsConfig.builder()
+                .setAps(Aps.builder()
+                        .setCategory(PUSH_CLICK)
+                        .build())
+                .build();
+    }
+}

src/main/java/org/example/tree/global/config/FCMConfig.java

@@ -28,9 +28,10 @@ public void initialize() {
                     .builder()
                     .setCredentials(GoogleCredentials.fromStream(refreshToken))
                     .build();
-
-            FirebaseApp.initializeApp(options);
-            log.info("Fcm Setting Completed");
+            if (FirebaseApp.getApps().isEmpty()) {
+                FirebaseApp.initializeApp(options);
+                log.info("Fcm Setting Completed");
+            }
 
         } catch (final IOException e) {
             throw new RuntimeException(e.getMessage());