FirebaseFileUpload.java

   
   public String[] uploadFile(MultipartFile multipartFile) throws IOException {
        File file = convertMultiPartToFile(multipartFile);
        Path filePath = file.toPath();
        String objectName = generateFileName(multipartFile);

        Storage storage = storageOptions.getService();

        BlobId blobId = BlobId.of(bucketName, objectName);
        BlobInfo blobInfo = BlobInfo.newBuilder(blobId).build();
        Blob blob = storage.create(blobInfo, Files.readAllBytes(filePath));

        log.info("File " + filePath + " uploaded to bucket " + bucketName + " as " + objectName);
        return new String[]{"fileUrl", objectName};
    }