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+# -*- coding: utf-8 -*-
+# srp_cred.py
+# Copyright (C) 2015 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/>.
+
+"""
+Credential module for authenticating SRP requests against the LEAP platform.
+"""
+
+# ----------------- DOC ------------------------------------------------------
+# See examples of cred modules:
+# https://github.com/oubiwann-unsupported/txBrowserID/blob/master/browserid/checker.py
+# http://stackoverflow.com/questions/19171686/book-twisted-network-programming-essentials-example-9-1-does-not-work
+# ----------------- DOC ------------------------------------------------------
+
+from zope.interface import implements, implementer, Interface
+
+from twisted.cred import portal, credentials, error as credError
+from twisted.cred.checkers import ICredentialsChecker
+from twisted.internet import defer
+
+from session import Session
+
+
+@implementer(ICredentialsChecker)
+class SRPCredentialsChecker(object):
+
+ # TODO need to decide if the credentials that we pass here are per provider
+ # or not.
+ # I think it's better to have the credentials passed with the full user_id,
+ # and here split user/provider.
+ # XXX then we need to check if the provider is properly configured, to get
+ # the right api info AND the needed certificates.
+ # XXX might need to initialize credential checker with a ProviderAPI
+
+ credentialInterfaces = (credentials.IUsernamePassword,)
+
+ def requestAvatarId(self, credentials):
+ # TODO If we are already authenticated, we should just
+ # return the session object, somehow.
+ # XXX If not authenticated (ie, no cached credentials?)
+ # we pass credentials to srpauth.authenticate method
+ # another srpauth class should interface with the blocking srpauth
+ # library, and chain all the calls needed to do the handshake.
+ # Therefore:
+ # should keep reference to the srpauth instances somewhere
+ # TODO If we want to return an anonymous user (useful for getting the
+ # anon-vpn cert), we should return an empty tuple from here.
+
+ return defer.maybeDeferred(_get_leap_session(credentials)).addCallback(
+ self._check_srp_auth)
+
+ def _check_srp_auth(session, username):
+ if session.is_authenticated:
+ # is ok! --- should add it to some global cache?
+ return defer.succeed(username)
+ else:
+ return defer.fail(credError.UnauthorizedLogin(
+ "Bad username/password combination"))
+
+
+def _get_leap_session(credentials):
+ session = Session(credentials)
+ d = session.authenticate()
+ d.addCallback(lambda _: session)
+ return d
+
+
+class ILeapUserAvatar(Interface):
+
+ # TODO add attributes for username, uuid, token, session_id
+
+ def logout():
+ """
+ Clean up per-login resource allocated to this avatar.
+ """
+
+
+@implementer(ILeapUserAvatar)
+class LeapUserAvatar(object):
+
+ # TODO initialize with: username, uuid, token, session_id
+ # TODO initialize provider data (for api)
+ # TODO how does this relate to LeapSession? maybe we should get one passed?
+
+ def logout(self):
+
+ # TODO reset the (global?) srpauth object.
+ # https://leap.se/en/docs/design/bonafide#logout
+ # DELETE API_BASE/logout(.json)
+ pass
+
+
+class LeapAuthRealm(object):
+ """
+ The realm corresponds to an application domain and is in charge of avatars,
+ which are network-accessible business logic objects.
+ """
+
+ # TODO should be initialized with provider API objects.
+
+ implements(portal.IRealm)
+
+ def requestAvatar(self, avatarId, mind, *interfaces):
+
+ if ILeapUserAvatar in interfaces:
+ # XXX how should we get the details for the requested avatar?
+ avatar = LeapUserAvatar()
+ return ILeapUserAvatar, avatar, avatar.logout
+
+ raise NotImplementedError(
+ "This realm only supports the ILeapUserAvatar interface.")