/// <reference types="node" />
import { Host, Options, QingStorError } from '../typings';
import { IReqOptionsWithBodyResOnly, PicGo } from 'picgo';
/**
 * Generate signature of qingstor.
 * @param options {Options} PicGo options, AKA infos user entered.
 * @param fileName {string} The upload image's name, AKA object key in oss.
 * @param extname {string} extname for Content-Type in request headers.
 * @return {string} The generated signature.
 */
export declare function generateSignature(options: Options, fileName: string, extname: string): string;
/**
 * Generate the upload path.
 * @param path {string} User entered path.
 * @return {string} the encoded path.
 */
export declare function generatePath(path: string): string;
/**
 * Get the request host.
 * @param customUrl {string} Custom url user entered.
 * @return {Host} The Host, which contains protocol and host.
 */
export declare function getHost(customUrl: string): Host;
/**
 * Get the upload options.
 * @param options {Options} User entered infos.
 * @param fileName {string} The file's name.
 * @param signature {string} The signature for upload.
 * @param image {Buffer} The image file's buffer.
 * @param extname {string} ext name.
 * @return {typeof request} The request info.
 */
export declare function uploadOptions(options: Options, fileName: string, signature: string, image: Buffer, extname: string): IReqOptionsWithBodyResOnly;
/**
 * Handle the request error and notify the user with the message.
 * @param ctx {PicGo} The context to show the notification.
 * @param err {QingStorError} The request error.
 */
export declare function handleError(ctx: PicGo, err: QingStorError): void;