消息体加密解密

由于公众平台提供的库是针对python2.7的。所以python3.7还是费了点功夫的。

加密解密库参考链接 (https://qydev.weixin.qq.com/wiki/index.php?title=%E5%8A%A0%E8%A7%A3%E5%AF%86%E5%BA%93%E4%B8%8B%E8%BD%BD%E4%B8%8E%E8%BF%94%E5%9B%9E%E7%A0%81)

1. 安装 pycrypto

 　　实际安装的是 pip3 install pycryptodemo

2. 对 WXBizMsgCrypt.py 文件针对python3的修改：

　　参考博文：https://blog.csdn.net/weixin_41762173/article/details/89221022

代码示例：

    def responseMsg(self):
        encrypt_type = self.request.GET.get('encrypt_type',None)
        if encrypt_type is not None and encrypt_type == 'aes': #解密
            timestamp = self.request.GET['timestamp']
            nonce = self.request.GET['nonce']
            msg_signature = self.request.GET['msg_signature']
            pc = WXBizMsgCrypt(TOKEN,EncodingAESKey,APPID)
            ret,descryptMsg = pc.DecryptMsg(self.request.body,msg_signature,timestamp,nonce)
            if ret != 0:
                print(ret)
                return ''
            postStr = descryptMsg
        else:
            postStr = self.request.body

        postObj = self._parseMsg(postStr)
        msg_type = postObj['MsgType']
        result =''
        if msg_type == 'text':
            keyword = postObj['Content']
            textTpl = '''
                            <xml>
                <ToUserName><![CDATA[{0}]]></ToUserName>
                <FromUserName><![CDATA[{1}]]></FromUserName>
                <CreateTime>{2}</CreateTime>
                <MsgType><![CDATA[{3}]]></MsgType>
                <Content><![CDATA[{4}]]></Content>
                </xml>
                            '''
            if keyword == '?' or keyword == '？':
                result = textTpl.format(postObj['FromUserName'],
                                        postObj['ToUserName'],
                                        int(time.time()),
                                        'text',
                                        time.strftime('%Y-%m-%d %H:%M:%S', time.localtime())
                                        )
        elif msg_type == 'event':
            pass

        if encrypt_type is not None and encrypt_type == 'aes': #解密
            ret,encryotMsg = pc.EncryptMsg(result,nonce,str(int(time.time())))
            result = encryotMsg

        return result