export declare class LocalInstance {
    private accessKey;
    private secretKey;
    constructor(accessKey: string, secretKey: string);
    /**
     * 计算客户端上传本地服务器需要的凭证
     * @param bucket
     * @param key
     * @returns
     */
    getUploadInfo(bucket: string, key?: string): {
        key: string | undefined;
        uploadToken: string;
        bucket: string;
    };
    /**
     * 管理端访问七牛云服务器
     * @param path
     * @param method
     * @param headers
     * @param body
     */
    private access;
    private generateUploadToken;
    verifyUploadToken(uploadToken: string): boolean | string;
    generateAccessToken(method: string, host: string, path: string, headers: Record<string, any>, query?: string | null, body?: RequestInit['body']): string;
    verifyAccessToken(accessToken: string, method: string, host: string, path: string, headers: Record<string, any>, query?: string | null, body?: RequestInit['body']): boolean;
    private base64ToUrlSafe;
    private hmacSha1;
    private urlSafeBase64Encode;
    private urlSafeBase64Decode;
}