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# Copyright 2016-2018 Yubico AB
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
from typing import Optional, Tuple, Union
from urllib import parse
import requests
from requests.exceptions import RequestException
from ..exceptions import YubiHsmConnectionError
from . import YhsmBackend
class HttpBackend(YhsmBackend):
"""A backend for communicating with a YubiHSM connector over HTTP."""
def __init__(
self,
url: str = "http://localhost:12345",
timeout: Optional[Union[Tuple[int, int], int]] = None,
):
"""Construct a new HttpBackend, connecting to the given URL.
The URL should be a http(s) URL to a running YubiHSM connector.
By default, the backend will attempt to connect to a connector running
locally, on the default port.
:param str url: (optional) The URL to connect to.
:param timeout: (optional) A timeout in seconds, or a tuple of two
values to use as connection timeout and request timeout.
:type timeout: int or tuple[int, int]
"""
if not url.endswith("/"):
url = url + "/"
self._url = parse.urljoin(url, "connector/api")
self._timeout = timeout
self._session = requests.Session()
self._session.headers.update({"Content-Type": "application/octet-stream"})
def transceive(self, msg):
try:
resp = self._session.post(url=self._url, data=msg, timeout=self._timeout)
resp.raise_for_status()
return resp.content
except RequestException as e:
raise YubiHsmConnectionError(e)
def close(self):
self._session.close()
def __repr__(self):
return '{0.__class__.__name__}("{0._url}")'.format(self)
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