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auth.py
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auth.py
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import uuid
import threading
from functools import wraps
from django.core.exceptions import PermissionDenied
from django.shortcuts import get_object_or_404
from django.http import HttpResponseRedirect
from helios.models import Election, Poll, Trustee, Voter
from heliosauth.models import User
from zeus.views.site import error as error_view
from zeus.log import init_election_logger, init_poll_logger, _locals
import logging
logger = logging.getLogger(__name__)
def get_ip(request):
ip = request.META.get('HTTP_X_FORWARDER_FOR', None)
if not ip:
ip = request.META.get('REMOTE_ADDR')
return ip
def trustee_view(func):
@wraps(func)
@election_view()
def wrapper(request, election, *args, **kwargs):
if not request.zeususer.is_trustee:
raise PermissionDenied("Only election trustees can access this"
"view")
kwargs['trustee'] = request.trustee
kwargs['election'] = election
return func(request, *args, **kwargs)
return wrapper
def election_view(check_access=True):
def wrapper(func):
@wraps(func)
def inner(request, *args, **kwargs):
allow_manager = getattr(func, '_allow_manager', False)
_check_access = check_access
user = request.zeususer
if user.is_authenticated():
_locals.user_id = user.user_id
_locals.ip = get_ip(request)
if allow_manager and user.is_manager:
_check_access = False
if 'election_uuid' in kwargs:
uuid = kwargs.pop('election_uuid')
election = get_object_or_404(Election, uuid=uuid)
if not user.can_access_election(election) and _check_access:
raise PermissionDenied("Election cannot be accessed by you")
kwargs['election'] = election
if 'poll_uuid' in kwargs:
uuid = kwargs.pop('poll_uuid')
poll = get_object_or_404(Poll, uuid=uuid)
if not user.can_access_poll(poll) and _check_access:
raise PermissionDenied("Poll cannot be accessed by you")
kwargs['poll'] = poll
return func(request, *args, **kwargs)
return inner
return wrapper
def poll_voter_required(func):
@election_view()
@wraps(func)
def wrapper(request, *args, **kwargs):
if not request.zeususer.is_voter:
raise PermissionDenied("Authenticated user required")
return func(request, *args, **kwargs)
return wrapper
def user_required(func):
@wraps(func)
def wrapper(request, *args, **kwargs):
if not request.zeususer or not request.zeususer.is_authenticated():
raise PermissionDenied("Authenticated user required")
return func(request, *args, **kwargs)
return wrapper
def superadmin_required(func):
@user_required
@wraps(func)
def wrapper(request, *args, **kwargs):
if not request.zeususer._user.superadmin_p:
raise PermissionDenied("Superadmin user required")
return func(request, *args, **kwargs)
return wrapper
def manager_or_superadmin_required(func):
@user_required
@wraps(func)
def wrapper(request, *args, **kwargs):
if not (request.zeususer._user.superadmin_p
or request.zeususer.is_manager):
raise PermissionDenied("Superadmin or manager required")
return func(request, *args, **kwargs)
return wrapper
def election_poll_required(func):
@election_view(check_access=True)
@wraps(func)
def wrapper(request, *args, **kwargs):
if not request.zeususer.is_voter:
raise PermissionDenied("Authenticated user required")
return func(request, *args, **kwargs)
return wrapper
def election_user_required(func):
@wraps(func)
@election_view()
@user_required
def wrapper(request, *args, **kwargs):
return func(request, *args, **kwargs)
return wrapper
def election_admin_required(func):
@election_view()
@user_required
@wraps(func)
def wrapper(request, *args, **kwargs):
user = request.zeususer
if not user.is_admin:
raise PermissionDenied("Elections administrator required")
return func(request, *args, **kwargs)
return wrapper
def unauthenticated_user_required(func):
@wraps(func)
def wrapper(request, *args, **kwargs):
if request.zeususer.is_authenticated():
return error_view(request, 403, "Please logout to access this view")
return func(request, *args, **kwargs)
return wrapper
def requires_election_features(*features):
def wrapper(func):
@wraps(func)
def inner(*args, **kwargs):
election = kwargs.get('election')
if not election.check_features(*features):
status = election.check_features_verbose(*features)
msg = ("Unmet election %s required "
"features %r") % (election.uuid, status)
logger.error(msg)
raise PermissionDenied(msg)
return func(*args, **kwargs)
return inner
return wrapper
def requires_poll_features(*features):
def wrapper(func):
@wraps(func)
def inner(*args, **kwargs):
poll = kwargs.get('poll')
if not poll.check_features(*features):
status = poll.check_features_verbose(*features)
msg = ("Unmet poll %s required "
"features %r") % (poll.uuid, status)
logger.error(msg)
raise PermissionDenied(msg)
return func(*args, **kwargs)
return inner
return wrapper
TRUSTEE_SESSION_KEY = 'zeus_trustee_uuid'
USER_SESSION_KEY = 'user'
VOTER_SESSION_KEY = 'CURRENT_VOTER'
class ZeusUser(object):
is_user = False
is_trustee = False
is_voter = False
is_admin = False
is_manager = False
is_superadmin = False
@classmethod
def from_request(self, request):
user = None
try:
users = get_users_from_request(request)
user = filter(lambda x:bool(x), users)[0]
except IndexError:
pass
return ZeusUser(user)
def __init__(self, user_obj):
self._user = user_obj
if isinstance(self._user, User):
self.is_user = True
if self._user.superadmin_p:
self.is_superadmin = True
if self._user.management_p or self._user.superadmin_p:
self.is_manager = True
if self._user.admin_p or self._user.superadmin_p:
self.is_admin = True
self.institution = self._user.institution
return
return
if isinstance(self._user, Trustee):
self.is_trustee = True
if isinstance(self._user, Voter):
if not self._user.excluded_at:
self.is_voter = True
@property
def user_id(self):
if self.is_admin:
return "ADMIN:%s" % self._user.user_id
if self.is_trustee:
return "TRUSTEE:%s" % self._user.email
if self.is_voter:
prefix = "VOTER"
voter = self._user
if voter.excluded_at:
prefix = "EXCLUDED_VOTER"
return "%s:%s" % (prefix, voter.voter_login_id)
raise Exception("Unknown user")
def is_authenticated(self):
return bool(self._user)
def authenticate(self, request):
session = request.session
if self.is_trustee:
key = TRUSTEE_SESSION_KEY
if self.is_admin:
key = USER_SESSION_KEY
if self.is_voter:
key = VOTER_SESSION_KEY
self._clear_session(request)
session[key] = self._user.pk
def logout(self, request):
self._clear_session(request)
self._user = None
self.is_voter = False
self.is_admin = False
self.is_trustee = False
self.is_manager = False
self.is_superadmin = False
def _clear_session(self, request):
for sess_key in [TRUSTEE_SESSION_KEY, USER_SESSION_KEY,
VOTER_SESSION_KEY]:
if sess_key in request.session:
del request.session[sess_key]
def can_access_poll(self, poll):
if self.is_voter:
return self._user.poll.uuid == poll.uuid
if self.is_admin:
if self._user.superadmin_p:
return True
return self._user.elections.filter(polls__in=[poll]).count() > 0
if self.is_trustee:
return self._user.election.polls.filter(
pk__in=[poll.pk]).count() > 0
return False
def can_access_election(self, election):
if self.is_voter:
return self._user.poll.election.uuid == election.uuid
if self.is_trustee:
return self._user.election == election
if self.is_admin:
if self._user.superadmin_p:
return True
return self._user.elections.filter(
pk__in=[election.pk]).count() > 0
return False
def get_users_from_request(request):
session = request.session
user, admin, trustee, voter = None, None, None, None
# identify user and admin
if session.has_key(USER_SESSION_KEY):
user = request.session[USER_SESSION_KEY]
try:
user = User.objects.get(pk=user)
if user.admin_p or user.superadmin_p:
admin = user
except User.DoesNotExist:
pass
# idenitfy voter
if request.session.has_key(VOTER_SESSION_KEY):
voter = request.session[VOTER_SESSION_KEY]
try:
voter = Voter.objects.get(pk=voter)
except Voter.DoesNotExist:
voter = None
pass
if not voter or voter.excluded_at:
del request.session[VOTER_SESSION_KEY]
#TODO: move this in middleware ??? raise PermissionDenied
# idenitfy trustee
if request.session.get(TRUSTEE_SESSION_KEY, None):
try:
trustee_pk = session.get(TRUSTEE_SESSION_KEY, None)
if trustee_pk:
trustee = Trustee.objects.get(pk=int(trustee_pk))
except:
pass
if user and not admin:
del session[USER_SESSION_KEY]
user = None
admin = None
# cleanup duplicate logins
if len(filter(lambda x:bool(x), [voter, trustee, admin])) > 1:
if voter:
if trustee:
del session[TRUSTEE_SESSION_KEY]
if admin:
del session[USER_SESSION_KEY]
if trustee:
if admin:
del session[USER_SESSION_KEY]
return voter, trustee, admin
def allow_manager_access(func):
func._allow_manager = True
func.func_globals['foo'] = 'bar'
return func