iothub_helper.py 文件源码

 复制代码def _buildIoTHubSasToken(self, deviceId, usage):
        if usage==self.USAGE_CREATE_DEVICE:
            keyValue=self.initialKeyValue
        elif usage==self.USAGE_DEVICE_SENDS_MESSAGE:
            keyValue=self.currentDeviceKey
        else:
            keyVale
        resourceUri = '%s/devices/%s' % (self.iotHost, deviceId)
        targetUri = resourceUri.lower()
        expiryTime = self._buildExpiryOn()
        toSign = '%s\n%s' % (targetUri, expiryTime)
        key = base64.b64decode(keyValue.encode('utf-8'))
        signature = urllib.request.pathname2url(
            base64.b64encode(
                hmac.HMAC(key, toSign.encode('utf-8'), hashlib.sha256).digest()
            )
        ).replace('/', '%2F')
        if usage==self.USAGE_CREATE_DEVICE:
            return self.TOKEN_FORMAT_WITH_POLICY % (signature, expiryTime, self.initialKeyName, targetUri)
        elif usage==self.USAGE_DEVICE_SENDS_MESSAGE:
            return self.TOKEN_FORMAT_NO_POLICY % (signature, expiryTime, targetUri)
        else:
            return None