接收用户消息

微信公众账号能够接收用户发送的六种格式的消息：文本，图片，语音，视频（短视频),地理位置，链接。

    def responseMsg(self):
        encrypt_type = self.request.GET.get('encrypt_type', None)
        pc, postStr = self._encrypt_data(encrypt_type)
        postObj = self._parseMsg(postStr)
        print(postObj)
        msg_type = postObj['MsgType']
        result = ''
        if msg_type == 'text':
            result = self._receiveText(postObj)
        elif msg_type == 'image':
            result = self._receiveImage(postObj)
        elif msg_type == 'voice':
            result = self._receiveVoice(postObj)
        elif msg_type == 'video' or msg_type == 'shortvideo':
            print('视频')
            print(msg_type)
            result = self._receiveVideo(postObj)
        elif msg_type == 'location':
            result = self._receiveLocation(postObj)
        elif msg_type == 'link':
            result = self._receiveLink(postObj)
        elif msg_type == 'event':
            result = self._receiveEvent(postObj)
        else:
            result = '不能识别的 msg type: ' + msg_type

    def _transmitText(self,obj,content):
        xmlTpl ='''
        <xml>
  <ToUserName><![CDATA[{0}]]></ToUserName>
  <FromUserName><![CDATA[{1}]]></FromUserName>
  <CreateTime>{2}</CreateTime>
  <MsgType><![CDATA[text]]></MsgType>
  <Content><![CDATA[{3}]]></Content>
</xml>
        '''
        result = xmlTpl.format(obj['FromUserName'],obj['ToUserName'],int(time.time()),content)
        return result