import { BaseChannel } from './index';
/**
 * WeChat Official Account Channel — v1.0.0
 *
 * Handles:
 * - GET verification (signature/timestamp/nonce/echostr)
 * - POST XML message parsing and reply
 * - Customer Service Message API for async replies
 * - Access token management with caching
 * - Template messages
 * - Subscribe/unsubscribe events
 */
export interface WeChatChannelConfig {
    /** WeChat Official Account AppID */
    appId: string;
    /** WeChat Official Account AppSecret */
    appSecret: string;
    /** Verification token for message validation */
    token: string;
    /** AES encoding key for encrypted messages (optional) */
    encodingAESKey?: string;
    /** HTTP server port (default: 8080) */
    port?: number;
}
export interface WeChatMessage {
    toUserName: string;
    fromUserName: string;
    createTime: number;
    msgType: 'text' | 'image' | 'voice' | 'video' | 'event';
    content?: string;
    msgId?: string;
    event?: string;
    eventKey?: string;
}
export interface TemplateMessageData {
    toUser: string;
    templateId: string;
    url?: string;
    data: Record<string, {
        value: string;
        color?: string;
    }>;
}
export declare class WeChatChannel extends BaseChannel {
    type: string;
    private config;
    private accessToken;
    private tokenExpiry;
    private server;
    constructor(config: WeChatChannelConfig);
    start(): Promise<void>;
    stop(): Promise<void>;
    /** Verify WeChat signature for GET requests */
    private handleVerification;
    /** Handle incoming POST messages (XML) */
    private handleIncoming;
    /** Verify WeChat signature */
    verifySignature(signature: string, timestamp: string, nonce: string): boolean;
    /** Parse WeChat XML message using regex */
    static parseXML(xml: string): WeChatMessage | null;
    /** Format response as WeChat XML */
    static formatXMLResponse(toUser: string, fromUser: string, content: string): string;
    /** Handle incoming WeChat message */
    handleMessage(wxMsg: WeChatMessage): Promise<string>;
    /** Handle WeChat events */
    private handleEvent;
    /** Convert WeChat message to internal Message */
    private wechatToMessage;
    /** Get or refresh access token */
    getAccessToken(): Promise<string>;
    /** Send customer service message */
    sendMessage(openId: string, text: string): Promise<void>;
    /** Send template message */
    sendTemplateMessage(data: TemplateMessageData): Promise<boolean>;
    /** Read request body */
    private readBody;
    /** Simple HTTPS GET */
    private httpsGet;
    /** Simple HTTPS POST */
    private httpsPost;
}
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