export type Headers = Record<string, string>;
export interface AuthCredentials {
    ak: string;
    sk: string;
}
export declare class AuthSignature {
    private credentials;
    headersToSign: string[];
    constructor(credentials: AuthCredentials);
    /**
     * Generate the signature based on http://gollum.baidu.com/AuthenticationMechanism
     *
     * @param method - The http request method, such as GET, POST, DELETE, PUT, ...
     * @param resource  - The request path.
     * @param params  - The query strings.
     * @param headers  - The http request headers.
     * @param timestamp  - Set the current timestamp.
     * @param expirationInSeconds  - The signature validation time.
     * @param headersToSign - The request headers list which will be used to calcualate the signature.
     * @returns The signature.
     */
    generateAuthorization(method: string, resource: string, params?: Record<string, string>, headers?: Record<string, string>, timestamp?: number, expirationInSeconds?: number, headersToSign?: string[]): Promise<string>;
    /**
     * 规范化网址
     *
     * @see https://developers.google.com/search/docs/crawling-indexing/canonicalization?hl=zh-cn
     * @param uri - 网址
     * @returns
     */
    uriCanonicalization(uri: string): string;
    /**
     * Canonical the query strings.
     *
     * @see http://gollum.baidu.com/AuthenticationMechanism#生成CanonicalQueryString
     * @param params - The query strings.
     */
    queryStringCanonicalization(params: Record<string, string>): string;
    /**
     * Canonical the http request headers.
     *
     * @see http://gollum.baidu.com/AuthenticationMechanism#生成CanonicalHeaders
     * @param headers - The http request headers.
     * @param headersToSign - The request headers list which will be used to calcualate the signature.
     * @returns canonicalHeaders and signedHeaders
     */
    headersCanonicalization(headers: Headers, headersToSign?: string[]): readonly [string[], string[]];
}
export declare class TokenManager {
    #private;
    getAccessToken(credentials: AuthCredentials): Promise<string>;
    requestAccessToken({ ak, sk }: AuthCredentials): Promise<{
        access_token: string;
        expires_in: number;
    }>;
}