import java.util.List;
import java.util.Map;

/**
 * Interface for cloud storage operations.
 * Implementations provide access to S3-compatible storage, GCS, or other cloud storage systems.
 */
public interface StorageClient extends AutoCloseable {

    /**
     * Uploads an object to storage.
     *
     * @param objectName the name/path for the object
     * @param inputStream the input stream of data to upload

        // Default to S3-compatible (MinIO, etc.)
        return StorageType.S3_COMPAT;
    }

    /**
     * Creates a StorageClient based on FessConfig.
     *
     * @param fessConfig the Fess configuration
     * @return configured StorageClient
     */
    public static StorageClient createClient(final FessConfig fessConfig) {
        final String endpoint = fessConfig.getStorageEndpoint();

	<component name="ftpClient"
		class="org.codelibs.fess.crawler.client.ftp.FtpClient" instance="prototype">
		<property name="charset">"UTF-8"</property>
	</component>

	<component name="storageClient"
		class="org.codelibs.fess.crawler.client.storage.StorageClient" instance="prototype">
		<property name="charset">"UTF-8"</property>
	</component>

	<component name="s3Client"

import org.codelibs.fess.crawler.Constants;
import org.codelibs.fess.exception.StorageException;
import org.codelibs.fess.mylasta.direction.FessConfig;
import org.codelibs.fess.storage.StorageClient;
import org.codelibs.fess.storage.StorageClientFactory;
import org.codelibs.fess.storage.StorageItem;
import org.codelibs.fess.util.ComponentUtil;
import org.codelibs.fess.util.RenderDataUtil;

- `ftp:.*`, `ftps:.*` → FtpClient
- `storage:.*` → StorageClient, `s3:.*` → S3Client, `gcs:.*` → GcsClient

### Cloud Storage Clients

- **S3Client**: AWS SDK v2, `s3://bucket/path`, properties: `endpoint`, `accessKey`, `secretKey`, `region`
- **GcsClient**: Google Cloud SDK, `gcs://bucket/path`, properties: `projectId`, `credentialsFile`, `endpoint`
- **StorageClient**: MinIO SDK, `storage://bucket/path`

### Services

import com.google.cloud.storage.Storage.BlobListOption;
import com.google.cloud.storage.StorageOptions;

/**
 * Google Cloud Storage client implementation.
 */
public class GcsStorageClient implements StorageClient {

    private static final Logger logger = LogManager.getLogger(GcsStorageClient.class);

    private final Storage storage;
    private final String bucket;

    /**

/**
 * S3-compatible storage client implementation using AWS SDK v2.
 * Supports Amazon S3, MinIO, and other S3-compatible storage systems.
 */
public class S3StorageClient implements StorageClient {

    private static final Logger logger = LogManager.getLogger(S3StorageClient.class);

    private final S3Client s3Client;
    private final String bucket;

    /**