azure_iot.py 文件源码

def _iotHubSasToken(self, uri):
        """Create the Azure IOT Hub SAS token

        Args:
            uri (str): Resource URI

        Returns:
            Token string
        """
        expiry = str(int((time.time() + self.TOKEN_VALID_SECS)))
        key = base64.b64decode(self.keyvalue.encode('utf-8'))
        sig = '{}\n{}'.format(uri, expiry).encode('utf-8')

        signature = urllib.quote(
            base64.b64encode(hmac.HMAC(key, sig, hashlib.sha256).digest())
            ).replace('/', '%2F')

        token = 'SharedAccessSignature sig={}&se={}&skn={}&sr={}'.format(
            signature, expiry, self.keyname, uri.lower())
        return token