fix: fcm config 수정 (#265)

src/main/java/com/palbang/unsemawang/config/FirebaseConfig.java

@@ -1,28 +1,35 @@
 package com.palbang.unsemawang.config;
 
 import java.io.IOException;
-
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
-
+import org.springframework.core.io.ClassPathResource;
 import com.google.auth.oauth2.GoogleCredentials;
 import com.google.firebase.FirebaseApp;
 import com.google.firebase.FirebaseOptions;
 import com.google.firebase.messaging.FirebaseMessaging;
-
 import jakarta.annotation.PostConstruct;
+import lombok.extern.slf4j.Slf4j;
+import java.io.InputStream;
 
+@Slf4j
 @Configuration
 public class FirebaseConfig {
 	private FirebaseApp firebaseApp;
 
 	@PostConstruct
 	public FirebaseApp initializeFcm() throws IOException {
+		// 프로젝트 내부에 있는 JSON 파일 로드
+
+		ClassPathResource resource = new ClassPathResource("firebase/serviceAccountKey.json");
+		InputStream serviceAccount = resource.getInputStream();
+
 		FirebaseOptions options = FirebaseOptions.builder()
-			.setCredentials(GoogleCredentials.getApplicationDefault())
+			.setCredentials(GoogleCredentials.fromStream(serviceAccount))
 			.build();
+
 		firebaseApp = FirebaseApp.initializeApp(options);
-		System.out.println("initializeFcm");
+		log.info("FirebaseApp initialized");
 		return firebaseApp;
 	}
 	@Bean