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wechat 设置服务多个公众号的问题 #143

@weixumian

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@weixumian

我有一个需求是需要做一个服务多个公众号的应用,
发现wechat的源码中,token是可以在前置中间件设置,但是
cryptor参数却不能在前置中间件设置:
不能动态的设置cryptor的参数,

if (this.encodingAESKey) {
    that.cryptor = new WXBizMsgCrypt(this.token, this.encodingAESKey, this.appid);
}
// 动态token,在前置中间件中设置该值req.wechat_token,优先选用
 if (!checkSignature(req.query, req.wechat_token || token)) {

是否可以把 设置cryptor参数的放到中间件函数中,如:

return function (req, res, next) {
    if (req.query.encrypt_type && req.query.msg_signature) {
    that.cryptor = new WXBizMsgCrypt(req.wechat_token.token,     req.wechat_token.encodingAESKey, req.wechat_token.appid);
     serveEncrypt(that, req, res, next, _respond);

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