import { Request, Response } from 'express';
import { DyNTS_AuthService } from '../../../_services/core/auth.service';
/**
 * OAuth2 Authentication Service implementation
 *
 * This service handles OAuth2 specific authentication flows and token management
 *
 * @example
 * const authService = DyNTS_OAuth2_AuthService.getInstance();
 * await authService.authenticate_token(req, res);
 */
export declare class DyNTS_OAuth2_AuthService extends DyNTS_AuthService {
    static getInstance(): DyNTS_OAuth2_AuthService;
    private readonly controlService;
    readonly authenticate_token: (req: Request, res: Response) => Promise<void>;
    readonly authenticate_tokenSelf: (req: Request, res: Response) => Promise<void>;
    readonly authenticate_tokenPerm_accUsageData: (req: Request, res: Response) => Promise<void>;
    /**
     * Gets the issuer (user ID) from the OAuth2 token in the request
     * @param req Express Request object
     * @returns The issuer ID from the token
     */
    getIssuerFromRequest(req: Request): string;
    /**
     * Gets the username from the OAuth2 token in the request
     * @param req Express Request object
     * @returns The username from the token
     */
    getUsernameFromRequest(req: Request): string;
}
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