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# -*- coding: utf-8 -*-
# _http.py
# Copyright (C) 2017 LEAP
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
"""
A twisted-based, TLS-pinned, token-authenticated HTTP client.
"""
import base64
from twisted.internet import reactor
from twisted.web.iweb import IAgent
from twisted.web.client import Agent
from twisted.web.http_headers import Headers
from treq.client import HTTPClient as _HTTPClient
from zope.interface import implementer
from leap.common.certs import get_compatible_ssl_context_factory
__all__ = ['HTTPClient', 'PinnedTokenAgent']
class HTTPClient(_HTTPClient):
def __init__(self, uuid, token, cert_file):
self._agent = PinnedTokenAgent(uuid, token, cert_file)
super(self.__class__, self).__init__(self._agent)
def set_token(self, token):
self._agent.set_token(token)
@implementer(IAgent)
class PinnedTokenAgent(Agent):
def __init__(self, uuid, token, cert_file):
self._uuid = uuid
self._token = None
self._creds = None
self.set_token(token)
# pin this agent with the platform TLS certificate
factory = get_compatible_ssl_context_factory(cert_file)
Agent.__init__(self, reactor, contextFactory=factory)
def set_token(self, token):
self._token = token
self._creds = self._encoded_creds()
def _encoded_creds(self):
creds = '%s:%s' % (self._uuid, self._token)
encoded = base64.b64encode(creds)
return 'Token %s' % encoded
def request(self, method, uri, headers=None, bodyProducer=None):
# authenticate the request
headers = headers or Headers()
headers.addRawHeader('Authorization', self._creds)
# perform the authenticated request
return Agent.request(
self, method, uri, headers=headers, bodyProducer=bodyProducer)
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