feat: Firebase 클라이언트 구현 (#130)

src/main/java/com/guttery/madii/common/config/firebase/FirebaseConfig.java

@@ -34,7 +34,6 @@ public void initialize() {
                 FirebaseApp.initializeApp(options);
             }
         } catch (final Exception e) {
-            e.printStackTrace();
             throw CustomException.of(ErrorDetails.FIREBASE_INTEGRATION_FAILED);
         }
     }

src/main/java/com/guttery/madii/domain/notification/domain/service/NotificationClient.java

@@ -0,0 +1,4 @@
+package com.guttery.madii.domain.notification.domain.service;
+
+public interface NotificationClient {
+}

src/main/java/com/guttery/madii/domain/notification/infrastructure/FirebaseNotificationClient.java

@@ -0,0 +1,24 @@
+package com.guttery.madii.domain.notification.infrastructure;
+
+import com.google.firebase.messaging.FirebaseMessaging;
+import com.google.firebase.messaging.FirebaseMessagingException;
+import com.google.firebase.messaging.Message;
+import com.guttery.madii.domain.notification.domain.service.NotificationClient;
+import org.springframework.stereotype.Component;
+
+@Component
+public class FirebaseNotificationClient implements NotificationClient {
+    public String sendNotification(String content, String token) {
+        try {
+            final Message message = Message.builder()
+                    .setToken(token)
+                    .putData("title", content)
+                    .build();
+
+            return FirebaseMessaging.getInstance().send(message);
+
+        } catch (FirebaseMessagingException e) {
+            return "Failed";
+        }
+    }
+}