import { Fetch } from '../types';
import { AuthAgent } from '../auth-agent';
export declare enum OAuth2GrantType {
    CLIENT_CREDENTIALS = "client_credentials",
    REFRESH_TOKEN = "refresh_token",
    AUTHORIZATION_CODE = "authorization_code",
    PASSWORD = "password"
}
export interface OAuth2Params {
    tokenUrl: string;
    clientId: string;
    clientSecret?: string;
    refreshToken?: string | null;
    accessToken?: string | null;
    expiresAt?: number | null;
    minValiditySeconds?: number;
    fetch?: Fetch;
}
export declare class OAuth2Agent extends AuthAgent {
    params: OAuth2Params;
    constructor(params: OAuth2Params);
    getHeader(): Promise<string | null>;
    createToken(params: OAuth2TokenParams): Promise<{
        accessToken: any;
        accessExpiresIn: any;
        refreshToken: any;
    }>;
    setTokens(tokens: Partial<OAuth2Tokens>): void;
    invalidate(): void;
    getAccessToken(): Promise<string | null>;
    protected tryCachedAccessToken(): Promise<string | null>;
    protected tryRefreshToken(): Promise<any>;
    protected tryClientSecret(): Promise<any>;
}
export interface OAuth2Tokens {
    accessToken: string;
    accessExpiresIn: number;
    refreshToken?: string;
}
export interface OAuth2TokenParams {
    grant_type: OAuth2GrantType;
    refresh_token?: string;
    client_id?: string;
    client_secret?: string;
    redirect_uri?: string;
    code?: string;
    username?: string;
    password?: string;
}