/**
 * OAuth2 Helper Functions
 */
import type { TokenInfo, RegisteredClient } from "./types.js";
export declare function generateClientId(): string;
export declare function generateClientSecret(): string;
export declare function validateClient(clientId: string, clientSecret: string): RegisteredClient | null;
export declare function getClient(clientId: string): RegisteredClient | null;
export declare function generateAuthorizationCode(): string;
export declare function generateRefreshToken(): string;
export declare function base64UrlEncode(buffer: Buffer): string;
export declare function verifyCodeChallenge(codeVerifier: string, codeChallenge: string, method: "plain" | "S256"): boolean;
export declare function generateAccessToken(): string;
export declare function validateTokenSignature(token: string): boolean;
export declare function createToken(clientId: string, scope: string[]): TokenInfo;
export declare function validateToken(token: string): TokenInfo | null;
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