/**
 * Token Storage for OAuth 2.1 authentication
 * Provides implementations for storing OAuth tokens
 */
import type { OAuthTokens, TokenStorage } from "../../types/index.js";
/**
 * In-memory token storage implementation
 * Suitable for development and single-session use
 * Tokens are lost when the process terminates
 */
export declare class InMemoryTokenStorage implements TokenStorage {
    private tokens;
    getTokens(serverId: string): Promise<OAuthTokens | null>;
    saveTokens(serverId: string, tokens: OAuthTokens): Promise<void>;
    deleteTokens(serverId: string): Promise<void>;
    hasTokens(serverId: string): Promise<boolean>;
    clearAll(): Promise<void>;
    /**
     * Get the number of stored token sets
     */
    get size(): number;
    /**
     * Get all server IDs with stored tokens
     */
    getServerIds(): string[];
}
/**
 * File-based token storage implementation
 * Persists tokens to disk for cross-session use
 */
export declare class FileTokenStorage implements TokenStorage {
    private filePath;
    private tokens;
    private loaded;
    constructor(filePath: string);
    private loadTokens;
    private saveToFile;
    getTokens(serverId: string): Promise<OAuthTokens | null>;
    saveTokens(serverId: string, tokens: OAuthTokens): Promise<void>;
    deleteTokens(serverId: string): Promise<void>;
    hasTokens(serverId: string): Promise<boolean>;
    clearAll(): Promise<void>;
}
/**
 * Check if tokens are expired or about to expire
 * @param tokens - OAuth tokens to check
 * @param bufferSeconds - Buffer time in seconds before expiration (default: 60)
 * @returns True if tokens are expired or will expire within buffer time
 */
export declare function isTokenExpired(tokens: OAuthTokens, bufferSeconds?: number): boolean;
/**
 * Calculate token expiration timestamp from expires_in value
 * @param expiresIn - Token lifetime in seconds
 * @returns Expiration timestamp (Unix epoch in milliseconds)
 */
export declare function calculateExpiresAt(expiresIn: number): number;