feat: google cloud storage 파일 업로드 기능 구현

.gitignore

@@ -5,6 +5,7 @@ build/
 !**/src/main/**/build/
 !**/src/test/**/build/
 *.yml
+credentials/*
 
 ### STS ###
 .apt_generated

build.gradle

@@ -32,6 +32,8 @@ dependencies {
 	implementation 'io.jsonwebtoken:jjwt-api:0.11.5'
 	implementation 'io.jsonwebtoken:jjwt-impl:0.11.5'
 	implementation 'io.jsonwebtoken:jjwt-jackson:0.11.5'
+	implementation 'com.google.auth:google-auth-library-oauth2-http:1.4.0'
+	implementation 'com.google.cloud:google-cloud-storage:2.1.5'
 	compileOnly 'org.projectlombok:lombok'
 	runtimeOnly 'com.h2database:h2'
 	annotationProcessor 'org.projectlombok:lombok'

src/main/java/com/j9/bestmoments/service/GoogleCloudStorageService.java

@@ -0,0 +1,46 @@
+package com.j9.bestmoments.service;
+
+import com.google.auth.oauth2.GoogleCredentials;
+import java.nio.file.Files;
+import java.nio.file.Paths;
+import java.util.UUID;
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.stereotype.Service;
+import java.io.IOException;
+import com.google.cloud.storage.BlobId;
+import com.google.cloud.storage.BlobInfo;
+import com.google.cloud.storage.Storage;
+import com.google.cloud.storage.StorageOptions;
+import org.springframework.web.multipart.MultipartFile;
+
+@Service
+@Slf4j
+public class GoogleCloudStorageService implements StorageService {
+
+    private final String bucketName;
+    private final Storage storage;
+
+    public GoogleCloudStorageService(
+            @Value("${storage.google-cloud.bucket.name}") String bucketName,
+            @Value("${storage.google-cloud.project.id}") String projectId
+    ) throws IOException {
+        this.bucketName = bucketName;
+        this.storage = StorageOptions.newBuilder()
+                .setProjectId(projectId)
+                .setCredentials(GoogleCredentials.fromStream(Files.newInputStream(Paths.get("credentials/bestmoments-file-uploader.json"))))
+                .build()
+                .getService();
+    }
+
+    // 다운로드 링크를 반환
+    @Override
+    public String uploadFile(MultipartFile file) throws IOException {
+        String fileName = String.format("%s.%s", UUID.randomUUID(), file.getContentType().split("/")[1]);
+        BlobId blobId = BlobId.of(bucketName, fileName);
+        BlobInfo blobInfo = BlobInfo.newBuilder(blobId).build();
+        storage.create(blobInfo, file.getInputStream());
+        log.info("blobId = {}", blobId);
+        return String.format("https://storage.cloud.google.com/%s/%s", bucketName, fileName);
+    }
+}

src/main/java/com/j9/bestmoments/service/StorageService.java

@@ -0,0 +1,10 @@
+package com.j9.bestmoments.service;
+
+import java.io.IOException;
+import org.springframework.web.multipart.MultipartFile;
+
+public interface StorageService {
+
+    String uploadFile(MultipartFile file) throws IOException;
+
+}