import { Response } from 'express';
import { JpegPipeOptions } from '../image/jpeg.pipe';
import { ThumbnailPipeOptions } from '../image/thumbnail.pipe';
export declare enum StorageMode {
    LOCAL = "local",
    QINIU = "qiniu",
    MINIO = "minio"
}
export declare class FileInfo {
    filename: string;
    path: string;
    mimetype?: string;
    extension?: string;
    constructor(o: FileInfo);
}
export declare class SavedFile extends FileInfo {
    readonly bucket: string;
    readonly region?: string;
    readonly prefix: string;
    readonly size?: number;
    readonly mode: StorageMode;
    readonly fullpath: string;
    constructor(o: SavedFile);
}
export declare type ResolverOpts = {
    filename: string;
    bucket: string;
    prefix?: string;
    query?: object;
    thumbnailConfig?: ThumbnailPipeOptions;
    jpegConfig?: JpegPipeOptions;
    resolver?: (url: string) => Promise<string>;
};
export interface IStorageEngine {
    /**
     * 这里会创建一个上传任务，异步执行
     * @param file
     * @param opts
     */
    saveEntity(file: FileInfo, opts: {
        bucket?: string;
        prefix?: string;
        region?: string;
    }): Promise<SavedFile>;
    listEntities(opts: {
        bucket?: string;
        prefix?: string;
    }): Promise<SavedFile[]>;
    removeEntities(opts: {
        bucket?: string;
        prefix?: string;
        filename?: string;
    }): Promise<void>;
    /**
     * 如果是远程仓库，该命令应该先下载文件。然后和本地仓库一样，返回文件信息
     * @param fileInfo
     * @param toPath?   保存文件目录的一个可选项，对本地仓库来说，应该直接略过该参数
     */
    getEntity(fileInfo: SavedFile, toPath?: string): Promise<string>;
    /**
     * 返回相应的 url，在包含 res 时直接通过 res 返回相应的信息
     * TODO need redesign
     */
    resolveUrl(opts: ResolverOpts): Promise<string>;
    resolveUrl(opts: ResolverOpts, res: Response): Promise<void>;
}
export declare function yearMonthStr(): string;