/**
 * License Guard — 本地授权校验核心
 *
 * 三道门禁:
 * 1. Boot Gate:    Gateway 启动时校验签名+过期
 * 2. Feature Gate: 运行时检查功能开关
 * 3. Quota Gate:   运行时检查配额 (Token/消息数)
 *
 * 零 SaaS 依赖，全部本地完成。
 */
import type { LicensePayload, LicenseFeatures, LicenseQuotas, LicenseValidation, LicensePlan } from './types.js';
/**
 * 对 payload 生成 HMAC-SHA256 签名
 */
export declare function signPayload(payload: LicensePayload, secret: string): string;
/**
 * 校验签名是否匹配
 */
export declare function verifySignature(payload: LicensePayload, signature: string, secret: string): boolean;
/**
 * 生成简单机器指纹: hostname + cpuModel + totalMem
 * 不追求绝对唯一，只是防止 license 直接拷贝到别的机器
 */
export declare function getMachineId(): string;
export declare class LicenseGuard {
    private licensePath;
    private secret;
    private license;
    private validation;
    private usageFile;
    private dailyMessages;
    private monthlyTokens;
    private lastResetDay;
    private lastResetMonth;
    constructor(licensePath: string, secret: string, usagePath?: string);
    /**
     * Gateway 启动时调用 — 读取 + 校验 License
     * @returns 校验结果，调用方根据 valid 决定是否继续启动
     */
    boot(): Promise<LicenseValidation>;
    /**
     * 检查某个功能是否启用
     */
    isFeatureEnabled(feature: keyof LicenseFeatures): boolean;
    /**
     * 获取当前生效的套餐
     */
    getEffectivePlan(): LicensePlan;
    /**
     * 获取当前配额
     */
    getQuotas(): LicenseQuotas;
    /**
     * 检查是否可以发送消息 (日消息配额)
     */
    canSendMessage(): {
        allowed: boolean;
        reason?: string;
    };
    /**
     * 检查是否可以消耗 Token (月 Token 配额)
     */
    canConsumeTokens(estimatedTokens: number): {
        allowed: boolean;
        reason?: string;
    };
    /**
     * 记录消息发送
     */
    recordMessage(): void;
    /**
     * 记录 Token 消耗
     */
    recordTokens(tokens: number): void;
    /**
     * 获取用量摘要
     */
    getUsageSummary(): {
        dailyMessages: number;
        monthlyTokens: number;
        quotas: LicenseQuotas;
    };
    private fail;
    private createFreeLicense;
    private resetCountersIfNeeded;
    private saveTimer;
    private saveUsageDebounced;
    private loadUsage;
}
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