/// <reference types="node" />
import { Stream } from 'stream';
import { FileStorageConnection } from '../connection/file-storage-connection';
import { PrivacyStrategy } from '../privacy/privacy';
/**
 * The service class responsible for retrieving data
 */
export declare class RetrieveProximaxDataService {
    readonly fileStorageConnection: FileStorageConnection;
    private readonly fileDownloadService;
    /**
     * Construct this class
     *
     * @param fileStorageConnection the connection to file storage
     */
    constructor(fileStorageConnection: FileStorageConnection);
    /**
     * Retrieve data's byte stream
     *
     * @param dataHash        the data hash of the target download
     * @param privacyStrategy the privacy strategy to decrypt the data
     * @param validateDigest  the flag whether to validate digest
     * @param digest          the digest of the target download
     * @param contentType     the content type of the target download
     * @return the data's byte stream
     */
    getStream(dataHash: string, privacyStrategy: PrivacyStrategy, validateDigest: boolean, digest?: string, contentType?: string): Promise<Stream>;
}