/// <reference types="node" />
/// <reference types="node" />
import { FileStorageOption, FileStorageProviderEnum, UploadedFile } from '@metad/contracts';
import { StorageEngine } from 'multer';
import { Provider } from './provider';
export interface IS3Config {
    rootPath: string;
    aws_access_key_id: string;
    aws_secret_access_key: string;
    aws_default_region: string;
    aws_bucket: string;
}
export declare class S3Provider extends Provider<S3Provider> {
    static instance: S3Provider;
    name: FileStorageProviderEnum;
    config: IS3Config;
    defaultConfig: IS3Config;
    fetchSetting: boolean;
    constructor();
    getInstance(): S3Provider;
    url(key: string): string;
    setAwsDetails(): void;
    path(filePath: string): string;
    handler({ dest, filename, prefix }: FileStorageOption): StorageEngine;
    getFile(key: string): Promise<Buffer>;
    putFile(fileContent: string, key?: string): Promise<any>;
    deleteFile(key: string): Promise<void>;
    private getS3Instance;
    getS3Bucket(): string;
    mapUploadedFile(file: any): UploadedFile;
}