OpenSlides/server/openslides/poll/views.py

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from textwrap import dedent
from django.contrib.auth import get_user_model
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from django.contrib.auth.models import AnonymousUser
from django.db import transaction
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from django.db.utils import IntegrityError
from rest_framework import status
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from openslides.utils.auth import in_some_groups
from openslides.utils.autoupdate import disable_history, inform_changed_data
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from openslides.utils.rest_api import (
DecimalField,
GenericViewSet,
ModelViewSet,
Response,
ValidationError,
action,
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)
from .models import BasePoll
class BasePollViewSet(ModelViewSet):
valid_update_keys = [
"majority_method",
"onehundred_percent_base",
"title",
"description",
]
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def check_view_permissions(self):
"""
the vote view is checked seperately. For all other views manage permissions
are required.
"""
if self.action == "vote":
return True
else:
return self.has_manage_permissions()
def get_locked_object(self):
"""
Enhance get_object to make sure to lock the underlying object to prevent
race conditions.
"""
poll = self.get_object()
return self.queryset.select_for_update().get(pk=poll.pk)
@transaction.atomic
def create(self, request, *args, **kwargs):
serializer = self.get_serializer(data=request.data)
serializer.is_valid(raise_exception=True)
# for analog polls, votes can be given directly when the poll is created
# for assignment polls, the options do not exist yet, so the AssignmentRelatedUser ids are needed
if "votes" in request.data:
poll = serializer.save()
poll.create_options()
self.handle_request_with_votes(request, poll)
else:
self.perform_create(serializer)
headers = self.get_success_headers(serializer.data)
return Response(
serializer.data, status=status.HTTP_201_CREATED, headers=headers
)
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def perform_create(self, serializer):
poll = serializer.save()
poll.create_options()
@transaction.atomic
def update(self, request, *args, **kwargs):
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"""
Customized view endpoint to update a poll.
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"""
poll = self.get_locked_object()
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partial = kwargs.get("partial", False)
serializer = self.get_serializer(poll, data=request.data, partial=partial)
serializer.is_valid(raise_exception=False)
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if poll.state != BasePoll.STATE_CREATED:
invalid_keys = set(serializer.validated_data.keys()) - set(
self.valid_update_keys
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)
if len(invalid_keys):
raise ValidationError(
{
"detail": dedent(
f"""
The poll is not in the created state.
You can only edit: {', '.join(self.valid_update_keys)}.
You provided the invalid keys: {', '.join(invalid_keys)}.
"""
)
}
)
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if "votes" in request.data:
self.handle_request_with_votes(request, poll)
return super().update(request, *args, **kwargs)
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def handle_request_with_votes(self, request, poll):
if poll.type != BasePoll.TYPE_ANALOG:
raise ValidationError(
{"detail": "You cannot enter votes for a non-analog poll."}
)
vote_data = request.data["votes"]
# convert user ids to option ids
self.convert_option_data(poll, vote_data)
self.validate_vote_data(vote_data, poll)
self.handle_analog_vote(vote_data, poll)
if request.data.get("publish_immediately"):
poll.state = BasePoll.STATE_PUBLISHED
elif (
poll.state != BasePoll.STATE_PUBLISHED
): # only set to finished if not already published
poll.state = BasePoll.STATE_FINISHED
poll.save()
def extend_history_information(self, information):
# Use this method to add history information when a poll is started and stopped.
# The implementation can be found in concret view set e. g. MotionPollViewSet.
pass
@action(detail=True, methods=["POST"])
@transaction.atomic
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def start(self, request, pk):
poll = self.get_locked_object()
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if poll.state != BasePoll.STATE_CREATED:
raise ValidationError({"detail": "Wrong poll state"})
poll.state = BasePoll.STATE_STARTED
poll.save()
inform_changed_data(poll.get_votes())
self.extend_history_information(["Voting started"])
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return Response()
@action(detail=True, methods=["POST"])
@transaction.atomic
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def stop(self, request, pk):
poll = self.get_locked_object()
# Analog polls cannot be stopped; they are stopped when
# the results are entered.
if poll.type == BasePoll.TYPE_ANALOG:
raise ValidationError(
{"detail": "Analog polls can not be stopped. Please enter votes."}
)
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if poll.state != BasePoll.STATE_STARTED:
raise ValidationError({"detail": "Wrong poll state"})
poll.stop()
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inform_changed_data(poll.get_votes())
inform_changed_data(poll.get_options())
self.extend_history_information(["Voting stopped"])
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return Response()
@action(detail=True, methods=["POST"])
@transaction.atomic
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def publish(self, request, pk):
poll = self.get_locked_object()
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if poll.state != BasePoll.STATE_FINISHED:
raise ValidationError({"detail": "Wrong poll state"})
poll.state = BasePoll.STATE_PUBLISHED
poll.save()
inform_changed_data(
(
vote.user
for vote in poll.get_votes().prefetch_related("user").all()
if vote.user
)
)
inform_changed_data(poll.get_votes())
inform_changed_data(poll.get_options())
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return Response()
@action(detail=True, methods=["POST"])
@transaction.atomic
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def pseudoanonymize(self, request, pk):
poll = self.get_locked_object()
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if poll.state not in (BasePoll.STATE_FINISHED, BasePoll.STATE_PUBLISHED):
raise ValidationError(
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{"detail": "Anonymizing can only be done after finishing a poll."}
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)
if poll.type != BasePoll.TYPE_NAMED:
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raise ValidationError({"detail": "You can just anonymize named polls."})
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poll.pseudoanonymize()
self.extend_history_information(["Voting anonymized"])
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return Response()
@action(detail=True, methods=["POST"])
@transaction.atomic
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def reset(self, request, pk):
poll = self.get_locked_object()
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poll.reset()
self.extend_history_information(["Voting reset"])
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return Response()
@action(detail=True, methods=["POST"])
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@transaction.atomic
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def vote(self, request, pk):
"""
For motion polls: Just "Y", "N" or "A" (if pollmethod is "YNA")
"""
poll = self.get_locked_object()
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# Disable history for these requests
disable_history()
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if isinstance(request.user, AnonymousUser):
self.permission_denied(request)
# data format is:
# { data: <vote_data>, [user_id: int] }
# if user_id is given, the operator votes for this user instead of himself
# user_id is ignored for analog polls
data = request.data
if "data" not in data:
raise ValidationError({"detail": "No data provided."})
vote_data = data["data"]
if (
"user_id" in data
and data["user_id"] != request.user.id
and poll.type != BasePoll.TYPE_ANALOG
):
try:
vote_user = get_user_model().objects.get(pk=data["user_id"])
except get_user_model().DoesNotExist:
raise ValidationError({"detail": "The given user does not exist."})
else:
vote_user = request.user
# check permissions based on poll type and user
self.assert_can_vote(poll, request, vote_user)
# validate the vote data
self.validate_vote_data(vote_data, poll)
if poll.type == BasePoll.TYPE_ANALOG:
self.handle_analog_vote(vote_data, poll)
if vote_data.get("publish_immediately") == "1":
poll.state = BasePoll.STATE_PUBLISHED
else:
poll.state = BasePoll.STATE_FINISHED
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poll.save()
elif poll.type == BasePoll.TYPE_NAMED:
self.handle_named_vote(vote_data, poll, vote_user, request.user)
elif poll.type == BasePoll.TYPE_PSEUDOANONYMOUS:
self.handle_pseudoanonymous_vote(vote_data, poll, vote_user)
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inform_changed_data(poll)
return Response()
@action(detail=True, methods=["POST"])
@transaction.atomic
def refresh(self, request, pk):
poll = self.get_locked_object()
inform_changed_data(poll)
inform_changed_data(poll.get_options())
inform_changed_data(poll.get_votes())
return Response()
def assert_can_vote(self, poll, request, vote_user):
"""
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Raises a permission denied, if the user is not allowed to vote (or has already voted).
Adds the user to the voted array, so this needs to be reverted if a later error happens!
Analog: has to have manage permissions
Named & Pseudoanonymous: has to be in a poll group and present
"""
# if the request user is not the vote user, the delegation must be right
if request.user != vote_user and request.user != vote_user.vote_delegated_to:
raise ValidationError(
{
"detail": f"You cannot vote for {vote_user.id} since the vote right was not delegated to you."
}
)
# If the request user is the vote user, this user must not have any delegation.
# It is not allowed to vote for oneself, if the vote is delegated
if request.user == vote_user and request.user.vote_delegated_to is not None:
raise ValidationError(
{"detail": "You cannot vote since your vote right is delegated."}
)
if poll.type == BasePoll.TYPE_ANALOG:
if not self.has_manage_permissions():
self.permission_denied(request)
else:
if poll.state != BasePoll.STATE_STARTED:
raise ValidationError(
{"detail": "You can only vote on a started poll."}
)
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if not request.user.is_present or not in_some_groups(
vote_user.id,
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list(poll.groups.values_list("pk", flat=True)),
exact=True,
):
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self.permission_denied(request)
try:
self.add_user_to_voted_array(vote_user, poll)
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inform_changed_data(poll)
except IntegrityError:
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raise ValidationError({"detail": "You have already voted."})
def parse_vote_value(self, obj, key):
""" Raises a ValidationError on incorrect values, including None """
if key not in obj:
raise ValidationError({"detail": f"The field {key} is required"})
field = DecimalField(min_value=-2, max_digits=15, decimal_places=6)
value = field.to_internal_value(obj[key])
if value < 0 and value != -1 and value != -2:
raise ValidationError(
{
"detail": "No fractional negative values allowed, only the special values -1 and -2"
}
)
return value
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def has_manage_permissions(self):
"""
Returns true, if the request user has manage perms.
"""
raise NotImplementedError()
def convert_option_data(self, poll, data):
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"""
May be overwritten by subclass. Adjusts the option data based on the now existing poll
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"""
pass
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def add_user_to_voted_array(self, user, poll):
"""
To be implemented by subclass. Adds the given user to the voted array of the given poll.
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This operation should be atomic: If the user is already in the array, an IntegrityError must
be thrown, otherwise the user must be added.
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"""
raise NotImplementedError()
def validate_vote_data(self, data, poll):
"""
To be implemented by subclass. Validates the data according to poll type and method and fields by validated versions.
Raises ValidationError on failure
"""
raise NotImplementedError()
def handle_analog_vote(self, data, poll):
"""
To be implemented by subclass. Handles the analog vote. Assumes data is validated
"""
raise NotImplementedError()
def handle_named_vote(self, data, poll, vote_user, request_user):
"""
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To be implemented by subclass. Handles the named vote. Assumes data is validated.
Needs to manage the voted-array per option.
"""
raise NotImplementedError()
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def handle_pseudoanonymous_vote(self, data, poll, user):
"""
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To be implemented by subclass. Handles the pseudoanonymous vote. Assumes data
is validated. Needs to check, if the vote is allowed by the voted-array per poll.
Needs to add the user to the voted-array.
"""
raise NotImplementedError()
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class BaseVoteViewSet(GenericViewSet):
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pass
class BaseOptionViewSet(GenericViewSet):
pass