59 lines
1.8 KiB
TypeScript
59 lines
1.8 KiB
TypeScript
import crypto from 'crypto';
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export interface WechatEncryptBuilderOptions {
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/** 预设的token，在微信公众平台/服务号后台配置 */
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token: string;
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/** 时间戳，使用Date.now()即可 */
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timestamp: string;
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/** 随机数，复用微信服务器传递的nonce参数 */
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nonce: string;
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}
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/**
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* 微信加密消息构建器
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*
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* 构建复合微信加密消息格式XML字符串，用于回包给微信服务器
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*
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* - 对应微信官方XML加密消息结构
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* @see 微信官方文档: [消息加解密说明](https://developers.weixin.qq.com/doc/service/guide/dev/push/encryption.html)
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*/
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export class WechatEncryptBuilder {
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/** 预设的token，在微信公众平台/服务号后台配置 */
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private token: string;
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/** 时间戳，使用Date.now()即可 */
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private timestamp: string;
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/** 随机数，复用微信服务器传递的nonce参数 */
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private nonce: string;
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constructor(options: WechatEncryptBuilderOptions) {
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const {
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token,
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timestamp,
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nonce,
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} = options;
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this.token = token;
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this.timestamp = timestamp;
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this.nonce = nonce;
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}
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/**
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* 构建微信加密消息XML Response字符串
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*
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* @param encrypt 加密后的消息体（Base64编码的字符串）
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* @returns 带有加密消息的XML Response字符串
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*/
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buildResponse(encrypt: string): string {
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const tempArray = [this.token, this.timestamp, this.nonce, encrypt].sort();
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const msgSig = crypto.createHash('sha1').update(tempArray.join('')).digest('hex');
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const responseXml = `<xml>
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<Encrypt><![CDATA[${encrypt}]]></Encrypt>
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<MsgSignature><![CDATA[${msgSig}]]></MsgSignature>
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<TimeStamp>${this.timestamp}</TimeStamp>
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<Nonce><![CDATA[${this.nonce}]]></Nonce>
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</xml>`;
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return responseXml;
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}
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} |