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# Copyright 2009 Canonical Ltd.
# This file is part of lazr.restfulclient.
#
# lazr.restfulclient is free software: you can redistribute it and/or modify
# it under the terms of the GNU Lesser General Public License as
# published by the Free Software Foundation, either version 3 of the
# License, or (at your option) any later version.
#
# lazr.restfulclient 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
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with lazr.restfulclient. If not, see
# <http://www.gnu.org/licenses/>.
"""Classes to authorize lazr.restfulclient with various web services.
This module includes an authorizer classes for HTTP Basic Auth,
as well as a base-class authorizer that does nothing.
A set of classes for authorizing with OAuth is located in the 'oauth'
module.
"""
__metaclass__ = type
__all__ = [
'BasicHttpAuthorizer',
'HttpAuthorizer',
]
import base64
class HttpAuthorizer:
"""Handles authentication for HTTP requests.
There are two ways to authenticate.
The authorize_session() method is called once when the client is
initialized. This works for authentication methods like Basic
Auth. The authorize_request is called for every HTTP request,
which is useful for authentication methods like Digest and OAuth.
The base class is a null authorizer which does not perform any
authentication at all.
"""
def authorizeSession(self, client):
"""Set up credentials for the entire session."""
pass
def authorizeRequest(self, absolute_uri, method, body, headers):
"""Set up credentials for a single request.
This probably involves setting the Authentication header.
"""
pass
@property
def user_agent_params(self):
"""Any parameters necessary to identify this user agent.
By default this is an empty dict (because authentication
details don't contain any information about the application
making the request), but when a resource is protected by
OAuth, the OAuth consumer name is part of the user agent.
"""
return {}
class BasicHttpAuthorizer(HttpAuthorizer):
"""Handles authentication for services that use HTTP Basic Auth."""
def __init__(self, username, password):
"""Constructor.
:param username: User to send as authorization for all requests.
:param password: Password to send as authorization for all requests.
"""
self.username = username
self.password = password
def authorizeRequest(self, absolute_uri, method, body, headers):
"""Set up credentials for a single request.
This sets the authorization header with the username/password.
"""
headers['authorization'] = 'Basic ' + base64.b64encode(
"%s:%s" % (self.username, self.password)).strip()
def authorizeSession(self, client):
client.add_credentials(self.username, self.password)