OpenSlides/openslides/motions/views.py

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Python
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import base64
import re
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from typing import Optional # noqa
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from django.conf import settings
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from django.contrib.staticfiles import finders
from django.core.exceptions import ValidationError as DjangoValidationError
from django.db import IntegrityError, transaction
from django.http import Http404
from django.utils.translation import ugettext as _
from django.utils.translation import ugettext_noop
from rest_framework import status
from ..core.config import config
from ..utils.auth import has_perm
from ..utils.autoupdate import inform_changed_data
from ..utils.collection import CollectionElement
from ..utils.rest_api import (
DestroyModelMixin,
GenericViewSet,
ModelViewSet,
Response,
UpdateModelMixin,
ValidationError,
detail_route,
)
from ..utils.views import APIView
from .access_permissions import (
CategoryAccessPermissions,
MotionAccessPermissions,
MotionBlockAccessPermissions,
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MotionChangeRecommendationAccessPermissions,
WorkflowAccessPermissions,
)
from .exceptions import WorkflowError
from .models import (
Category,
Motion,
MotionBlock,
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MotionChangeRecommendation,
MotionPoll,
MotionVersion,
State,
Workflow,
)
from .serializers import MotionPollSerializer
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# Viewsets for the REST API
class MotionViewSet(ModelViewSet):
"""
API endpoint for motions.
There are the following views: metadata, list, retrieve, create,
partial_update, update, destroy, manage_version, support, set_state and
create_poll.
"""
access_permissions = MotionAccessPermissions()
queryset = Motion.objects.all()
def check_view_permissions(self):
"""
Returns True if the user has required permissions.
"""
if self.action in ('list', 'retrieve'):
result = self.get_access_permissions().check_permissions(self.request.user)
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elif self.action in ('metadata', 'partial_update', 'update'):
result = has_perm(self.request.user, 'motions.can_see')
# For partial_update and update requests the rest of the check is
# done in the update method. See below.
elif self.action == 'create':
result = (has_perm(self.request.user, 'motions.can_see') and
has_perm(self.request.user, 'motions.can_create') and
(not config['motions_stop_submitting'] or
has_perm(self.request.user, 'motions.can_manage')))
elif self.action in ('destroy', 'manage_version', 'set_state', 'set_recommendation',
'follow_recommendation', 'create_poll'):
result = (has_perm(self.request.user, 'motions.can_see') and
has_perm(self.request.user, 'motions.can_manage'))
elif self.action == 'support':
result = (has_perm(self.request.user, 'motions.can_see') and
has_perm(self.request.user, 'motions.can_support'))
else:
result = False
return result
def create(self, request, *args, **kwargs):
"""
Customized view endpoint to create a new motion.
"""
# Check if parent motion exists.
if request.data.get('parent_id') is not None:
try:
parent_motion = CollectionElement.from_values(
Motion.get_collection_string(),
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request.data['parent_id']) # type: Optional[CollectionElement]
except Motion.DoesNotExist:
raise ValidationError({'detail': _('The parent motion does not exist.')})
else:
parent_motion = None
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# Check permission to send some data.
if not has_perm(request.user, 'motions.can_manage'):
# Remove fields that the user is not allowed to send.
# The list() is required because we want to use del inside the loop.
keys = list(request.data.keys())
whitelist = [
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'title',
'text',
'reason',
'comments', # This is checked later.
]
if parent_motion is not None:
# For creating amendments.
whitelist.extend([
'parent_id',
'category_id', # This will be set to the matching
'motion_block_id', # values from parent_motion.
])
request.data['category_id'] = parent_motion.get_full_data().get('category_id')
request.data['motion_block_id'] = parent_motion.get_full_data().get('motion_block_id')
for key in keys:
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if key not in whitelist:
del request.data[key]
# Check permission to send comment data.
if not has_perm(request.user, 'motions.can_see_and_manage_comments'):
try:
# Ignore comments data if user is not allowed to send comments.
del request.data['comments']
except KeyError:
# No comments here. Just do nothing.
pass
# Validate data and create motion.
serializer = self.get_serializer(data=request.data)
serializer.is_valid(raise_exception=True)
motion = serializer.save(request_user=request.user)
# Write the log message and initiate response.
motion.write_log([ugettext_noop('Motion created')], request.user)
# Send new submitters and supporters via autoupdate because users
# without permission to see users may not have them but can get it now.
new_users = list(motion.submitters.all())
new_users.extend(motion.supporters.all())
inform_changed_data(new_users)
headers = self.get_success_headers(serializer.data)
return Response(serializer.data, status=status.HTTP_201_CREATED, headers=headers)
def update(self, request, *args, **kwargs):
"""
Customized view endpoint to update a motion.
Checks also whether the requesting user can update the motion. He
needs at least the permissions 'motions.can_see' (see
self.check_view_permissions()). Also check manage permission or
submitter and state.
"""
# Get motion.
motion = self.get_object()
# Check permissions.
if (not has_perm(request.user, 'motions.can_manage') and
not (motion.is_submitter(request.user) and motion.state.allow_submitter_edit) and
not has_perm(request.user, 'motions.can_see_and_manage_comments')):
self.permission_denied(request)
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# Check permission to send only some data.
if not has_perm(request.user, 'motions.can_manage'):
# Remove fields that the user is not allowed to change.
# The list() is required because we want to use del inside the loop.
keys = list(request.data.keys())
whitelist = [
'comments', # This is checked later.
]
# Add title, text and reason to the whitelist only, if the user is the submitter.
if motion.is_submitter(request.user) and motion.state.allow_submitter_edit:
whitelist.extend((
'title',
'text',
'reason',
))
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for key in keys:
if key not in whitelist:
del request.data[key]
if not has_perm(request.user, 'motions.can_see_and_manage_comments'):
try:
del request.data['comments']
except KeyError:
# No comments here. Just do nothing.
pass
# Validate data and update motion.
serializer = self.get_serializer(
motion,
data=request.data,
partial=kwargs.get('partial', False))
serializer.is_valid(raise_exception=True)
updated_motion = serializer.save(disable_versioning=request.data.get('disable_versioning'))
# Write the log message, check removal of supporters and initiate response.
# TODO: Log if a version was updated.
updated_motion.write_log([ugettext_noop('Motion updated')], request.user)
if (config['motions_remove_supporters'] and updated_motion.state.allow_support and
not has_perm(request.user, 'motions.can_manage')):
updated_motion.supporters.clear()
updated_motion.write_log([ugettext_noop('All supporters removed')], request.user)
# Send new submitters and supporters via autoupdate because users
# without permission to see users may not have them but can get it now.
new_users = list(updated_motion.submitters.all())
new_users.extend(updated_motion.supporters.all())
inform_changed_data(new_users)
return Response(serializer.data)
@detail_route(methods=['put', 'delete'])
def manage_version(self, request, pk=None):
"""
Special view endpoint to permit and delete a version of a motion.
Send PUT {'version_number': <number>} to permit and DELETE
{'version_number': <number>} to delete a version. Deleting the
active version is not allowed. Only managers can use this view.
"""
# Retrieve motion and version.
motion = self.get_object()
version_number = request.data.get('version_number')
try:
version = motion.versions.get(version_number=version_number)
except MotionVersion.DoesNotExist:
raise Http404('Version %s not found.' % version_number)
# Permit or delete version.
if request.method == 'PUT':
# Permit version.
motion.active_version = version
motion.save(update_fields=['active_version'])
motion.write_log(
message_list=[ugettext_noop('Version'),
' %d ' % version.version_number,
ugettext_noop('permitted')],
person=self.request.user)
message = _('Version %d permitted successfully.') % version.version_number
else:
# Delete version.
# request.method == 'DELETE'
if version == motion.active_version:
raise ValidationError({'detail': _('You can not delete the active version of a motion.')})
version.delete()
motion.write_log(
message_list=[ugettext_noop('Version'),
' %d ' % version.version_number,
ugettext_noop('deleted')],
person=self.request.user)
message = _('Version %d deleted successfully.') % version.version_number
# Initiate response.
return Response({'detail': message})
@detail_route(methods=['post', 'delete'])
def support(self, request, pk=None):
"""
Special view endpoint to support a motion or withdraw support
(unsupport).
Send POST to support and DELETE to unsupport.
"""
# Retrieve motion and allowed actions.
motion = self.get_object()
# Support or unsupport motion.
if request.method == 'POST':
# Support motion.
if not (motion.state.allow_support and
config['motions_min_supporters'] > 0 and
not motion.is_submitter(request.user) and
not motion.is_supporter(request.user)):
raise ValidationError({'detail': _('You can not support this motion.')})
motion.supporters.add(request.user)
motion.write_log([ugettext_noop('Motion supported')], request.user)
# Send new supporter via autoupdate because users without permission
# to see users may not have it but can get it now.
inform_changed_data([request.user])
message = _('You have supported this motion successfully.')
else:
# Unsupport motion.
# request.method == 'DELETE'
if not motion.state.allow_support or not motion.is_supporter(request.user):
raise ValidationError({'detail': _('You can not unsupport this motion.')})
motion.supporters.remove(request.user)
motion.write_log([ugettext_noop('Motion unsupported')], request.user)
message = _('You have unsupported this motion successfully.')
# Initiate response.
return Response({'detail': message})
@detail_route(methods=['put'])
def set_state(self, request, pk=None):
"""
Special view endpoint to set and reset a state of a motion.
Send PUT {'state': <state_id>} to set and just PUT {} to reset the
state. Only managers can use this view.
"""
# Retrieve motion and state.
motion = self.get_object()
state = request.data.get('state')
# Set or reset state.
if state is not None:
# Check data and set state.
try:
state_id = int(state)
except ValueError:
raise ValidationError({'detail': _('Invalid data. State must be an integer.')})
if state_id not in [item.id for item in motion.state.next_states.all()]:
raise ValidationError(
{'detail': _('You can not set the state to %(state_id)d.') % {'state_id': state_id}})
motion.set_state(state_id)
else:
# Reset state.
motion.reset_state()
# Save motion.
motion.save(update_fields=['state', 'identifier', 'identifier_number'], skip_autoupdate=True)
message = _('The state of the motion was set to %s.') % motion.state.name
# Write the log message and initiate response.
motion.write_log(
message_list=[ugettext_noop('State set to'), ' ', motion.state.name],
person=request.user,
skip_autoupdate=True)
inform_changed_data(motion)
return Response({'detail': message})
@detail_route(methods=['put'])
def set_recommendation(self, request, pk=None):
"""
Special view endpoint to set a recommendation of a motion.
Send PUT {'recommendation': <state_id>} to set and just PUT {} to
reset the recommendation. Only managers can use this view.
"""
# Retrieve motion and recommendation state.
motion = self.get_object()
recommendation_state = request.data.get('recommendation')
# Set or reset recommendation.
if recommendation_state is not None:
# Check data and set recommendation.
try:
recommendation_state_id = int(recommendation_state)
except ValueError:
raise ValidationError({'detail': _('Invalid data. Recommendation must be an integer.')})
recommendable_states = State.objects.filter(workflow=motion.workflow, recommendation_label__isnull=False)
if recommendation_state_id not in [item.id for item in recommendable_states]:
raise ValidationError(
{'detail': _('You can not set the recommendation to {recommendation_state_id}.').format(
recommendation_state_id=recommendation_state_id)})
motion.set_recommendation(recommendation_state_id)
else:
# Reset recommendation.
motion.recommendation = None
# Save motion.
motion.save(update_fields=['recommendation'])
label = motion.recommendation.recommendation_label if motion.recommendation else 'None'
message = _('The recommendation of the motion was set to %s.') % label
# Write the log message and initiate response.
motion.write_log(
message_list=[ugettext_noop('Recommendation set to'), ' ', label],
person=request.user)
return Response({'detail': message})
@detail_route(methods=['post'])
def follow_recommendation(self, request, pk=None):
motion = self.get_object()
if motion.recommendation is None:
raise ValidationError({'detail': _('Cannot set an empty recommendation.')})
# Set state.
motion.set_state(motion.recommendation)
# Set the special state comment.
extension = request.data.get('recommendationExtension')
if extension is not None:
# Find the special "state" comment field.
for id, field in config['motions_comments'].items():
if 'forState' in field and field['forState'] is True:
motion.comments[id] = extension
break
# Save and write log.
motion.save(
update_fields=['state', 'identifier', 'identifier_number', 'comments'],
skip_autoupdate=True)
motion.write_log(
message_list=[ugettext_noop('State set to'), ' ', motion.state.name],
person=request.user,
skip_autoupdate=True)
# Now send all changes to the clients.
inform_changed_data(motion)
return Response({'detail': 'Recommendation followed successfully.'})
@detail_route(methods=['post'])
def create_poll(self, request, pk=None):
"""
View to create a poll. It is a POST request without any data.
"""
motion = self.get_object()
if not motion.state.allow_create_poll:
raise ValidationError({'detail': 'You can not create a poll in this motion state.'})
try:
with transaction.atomic():
motion.create_poll(skip_autoupdate=True)
except WorkflowError as e:
raise ValidationError({'detail': e})
motion.write_log([ugettext_noop('Vote created')], request.user, skip_autoupdate=True)
inform_changed_data(motion)
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return Response({'detail': _('Vote created successfully.')})
class MotionPollViewSet(UpdateModelMixin, DestroyModelMixin, GenericViewSet):
"""
API endpoint for motion polls.
There are the following views: update, partial_update and destroy.
"""
queryset = MotionPoll.objects.all()
serializer_class = MotionPollSerializer
def check_view_permissions(self):
"""
Returns True if the user has required permissions.
"""
return (has_perm(self.request.user, 'motions.can_see') and
has_perm(self.request.user, 'motions.can_manage'))
def update(self, *args, **kwargs):
"""
Customized view endpoint to update a motion poll.
"""
result = super().update(*args, **kwargs)
poll = self.get_object()
poll.motion.write_log([ugettext_noop('Vote updated')], self.request.user)
return result
def destroy(self, *args, **kwargs):
"""
Customized view endpoint to delete a motion poll.
"""
poll = self.get_object()
result = super().destroy(*args, **kwargs)
poll.motion.write_log([ugettext_noop('Vote deleted')], self.request.user)
return result
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class MotionChangeRecommendationViewSet(ModelViewSet):
"""
API endpoint for motion change recommendations.
There are the following views: metadata, list, retrieve, create,
partial_update, update and destroy.
"""
access_permissions = MotionChangeRecommendationAccessPermissions()
queryset = MotionChangeRecommendation.objects.all()
def check_view_permissions(self):
"""
Returns True if the user has required permissions.
"""
if self.action in ('list', 'retrieve'):
result = self.get_access_permissions().check_permissions(self.request.user)
elif self.action == 'metadata':
result = has_perm(self.request.user, 'motions.can_see')
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elif self.action in ('create', 'destroy', 'partial_update', 'update'):
result = (has_perm(self.request.user, 'motions.can_see') and
has_perm(self.request.user, 'motions.can_manage'))
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else:
result = False
return result
def create(self, request, *args, **kwargs):
"""
Creating a Change Recommendation, custom exception handling
"""
try:
return super().create(request, *args, **kwargs)
except DjangoValidationError as err:
return Response({'detail': err.message}, status=400)
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class CategoryViewSet(ModelViewSet):
"""
API endpoint for categories.
There are the following views: metadata, list, retrieve, create,
partial_update, update, destroy and numbering.
"""
access_permissions = CategoryAccessPermissions()
queryset = Category.objects.all()
def check_view_permissions(self):
"""
Returns True if the user has required permissions.
"""
if self.action in ('list', 'retrieve'):
result = self.get_access_permissions().check_permissions(self.request.user)
elif self.action == 'metadata':
result = has_perm(self.request.user, 'motions.can_see')
elif self.action in ('create', 'partial_update', 'update', 'destroy', 'numbering'):
result = (has_perm(self.request.user, 'motions.can_see') and
has_perm(self.request.user, 'motions.can_manage'))
else:
result = False
return result
@detail_route(methods=['post'])
def numbering(self, request, pk=None):
"""
Special view endpoint to number all motions in this category.
Only managers can use this view.
Send POST {'motions': [<list of motion ids>]} to sort the given
motions in a special order. Ids of motions which do not belong to
the category are just ignored. Send just POST {} to sort all
motions in the category by database id.
Amendments will get a new identifier prefix if the old prefix matches
the old parent motion identifier.
"""
category = self.get_object()
number = 0
instances = []
# If MOTION_IDENTIFIER_WITHOUT_BLANKS is set, don't use blanks when building identifier.
without_blank = hasattr(settings, 'MOTION_IDENTIFIER_WITHOUT_BLANKS') and settings.MOTION_IDENTIFIER_WITHOUT_BLANKS
# Prepare ordered list of motions.
if not category.prefix:
prefix = ''
elif without_blank:
prefix = '%s' % category.prefix
else:
prefix = '%s ' % category.prefix
motions = category.motion_set.all()
motion_list = request.data.get('motions')
if motion_list:
motion_dict = {}
for motion in motions.filter(id__in=motion_list):
motion_dict[motion.pk] = motion
motions = [motion_dict[pk] for pk in motion_list]
# Change identifiers.
try:
with transaction.atomic():
# Collect old and new identifiers.
motions_to_be_sorted = []
for motion in motions:
if motion.is_amendment():
parent_identifier = motion.parent.identifier or ''
if without_blank:
prefix = '%s%s' % (parent_identifier, config['motions_amendments_prefix'])
else:
prefix = '%s %s ' % (parent_identifier, config['motions_amendments_prefix'])
number += 1
new_identifier = '%s%s' % (prefix, motion.extend_identifier_number(number))
motions_to_be_sorted.append({
'motion': motion,
'old_identifier': motion.identifier,
'new_identifier': new_identifier,
'number': number
})
# Remove old identifiers
for motion in motions:
motion.identifier = None
motion.skip_autoupdate = True # This line is to skip agenda item autoupdate. See agenda/signals.py.
motion.save(skip_autoupdate=True)
# Set new identifers and change identifiers of amendments.
for obj in motions_to_be_sorted:
motion = obj['motion']
motion.identifier = obj['new_identifier']
motion.identifier_number = obj['number']
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motion.save(skip_autoupdate=True)
instances.append(motion)
instances.append(motion.agenda_item)
# Change identifiers of amendments.
for child in motion.get_amendments_deep():
if child.identifier.startswith(obj['old_identifier']):
child.identifier = re.sub(
obj['old_identifier'],
obj['new_identifier'],
child.identifier,
count=1)
child.skip_autoupdate = True # This line is to skip agenda item autoupdate. See agenda/signals.py.
child.save(skip_autoupdate=True)
instances.append(child)
instances.append(child.agenda_item)
except IntegrityError:
message = _('Error: At least one identifier of this category does '
'already exist in another category.')
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response = Response({'detail': message}, status=400)
else:
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inform_changed_data(instances)
message = _('All motions in category {category} numbered '
'successfully.').format(category=category)
response = Response({'detail': message})
return response
class MotionBlockViewSet(ModelViewSet):
"""
API endpoint for motion blocks.
There are the following views: metadata, list, retrieve, create,
partial_update, update and destroy.
"""
access_permissions = MotionBlockAccessPermissions()
queryset = MotionBlock.objects.all()
def check_view_permissions(self):
"""
Returns True if the user has required permissions.
"""
if self.action in ('list', 'retrieve'):
result = self.get_access_permissions().check_permissions(self.request.user)
elif self.action == 'metadata':
result = has_perm(self.request.user, 'motions.can_see')
elif self.action in ('create', 'partial_update', 'update', 'destroy', 'follow_recommendations'):
result = (has_perm(self.request.user, 'motions.can_see') and
has_perm(self.request.user, 'motions.can_manage'))
else:
result = False
return result
@detail_route(methods=['post'])
def follow_recommendations(self, request, pk=None):
"""
View to set the states of all motions of this motion block each to
its recommendation. It is a POST request without any data.
"""
motion_block = self.get_object()
instances = []
with transaction.atomic():
for motion in motion_block.motion_set.all():
# Follow recommendation.
motion.follow_recommendation()
motion.save(skip_autoupdate=True)
# Write the log message.
motion.write_log(
message_list=[ugettext_noop('State set to'), ' ', motion.state.name],
person=request.user,
skip_autoupdate=True)
instances.append(motion)
inform_changed_data(instances)
return Response({'detail': _('Followed recommendations successfully.')})
class WorkflowViewSet(ModelViewSet):
"""
API endpoint for workflows.
There are the following views: metadata, list, retrieve, create,
partial_update, update and destroy.
"""
access_permissions = WorkflowAccessPermissions()
queryset = Workflow.objects.all()
def check_view_permissions(self):
"""
Returns True if the user has required permissions.
"""
if self.action in ('list', 'retrieve'):
result = self.get_access_permissions().check_permissions(self.request.user)
elif self.action == 'metadata':
result = has_perm(self.request.user, 'motions.can_see')
elif self.action in ('create', 'partial_update', 'update', 'destroy'):
result = (has_perm(self.request.user, 'motions.can_see') and
has_perm(self.request.user, 'motions.can_manage'))
else:
result = False
return result
# Special API views
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class MotionDocxTemplateView(APIView):
"""
Returns the template for motions docx export
"""
http_method_names = ['get']
def get_context_data(self, **context):
with open(finders.find('templates/docx/motions.docx'), "rb") as file:
response = base64.b64encode(file.read())
return response