OpenSlides/openslides/agenda/views.py

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Python
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import jsonschema
from django.contrib.auth import get_user_model
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from django.db import transaction
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from openslides.core.config import config
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from openslides.utils.autoupdate import inform_changed_data
from openslides.utils.exceptions import OpenSlidesError
from openslides.utils.rest_api import (
GenericViewSet,
ListModelMixin,
Response,
RetrieveModelMixin,
UpdateModelMixin,
ValidationError,
detail_route,
list_route,
)
from .access_permissions import ItemAccessPermissions
from .models import Item, Speaker
from ..utils.auth import has_perm
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# Viewsets for the REST API
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class ItemViewSet(ListModelMixin, RetrieveModelMixin, UpdateModelMixin, GenericViewSet):
"""
API endpoint for agenda items.
There are some views, see check_view_permissions.
"""
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access_permissions = ItemAccessPermissions()
queryset = Item.objects.all()
def check_view_permissions(self):
"""
Returns True if the user has required permissions.
"""
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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", "manage_speaker", "tree"):
result = has_perm(self.request.user, "agenda.can_see")
# For manage_speaker and tree requests the rest of the check is
# done in the specific method. See below.
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elif self.action in ("partial_update", "update", "sort", "assign"):
result = (
has_perm(self.request.user, "agenda.can_see")
and has_perm(self.request.user, "agenda.can_see_internal_items")
and has_perm(self.request.user, "agenda.can_manage")
)
elif self.action in ("speak", "sort_speakers"):
result = has_perm(self.request.user, "agenda.can_see") and has_perm(
self.request.user, "agenda.can_manage_list_of_speakers"
)
elif self.action in ("numbering",):
result = has_perm(self.request.user, "agenda.can_see") and has_perm(
self.request.user, "agenda.can_manage"
)
else:
result = False
return result
def update(self, *args, **kwargs):
"""
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Customized view endpoint to update all children if the item type has changed.
"""
old_type = self.get_object().type
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response = super().update(*args, **kwargs)
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# Update all children if the item type has changed.
item = self.get_object()
if old_type != item.type:
items_to_update = []
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# Recursively add children to items_to_update.
def add_item(item):
items_to_update.append(item)
for child in item.children.all():
add_item(child)
add_item(item)
inform_changed_data(items_to_update)
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return response
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@detail_route(methods=["POST", "PATCH", "DELETE"])
def manage_speaker(self, request, pk=None):
"""
Special view endpoint to add users to the list of speakers or remove
them. Send POST {'user': <user_id>} to add a new speaker. Omit
data to add yourself. Send DELETE {'speaker': <speaker_id>} or
DELETE {'speaker': [<speaker_id>, <speaker_id>, ...]} to remove one or
more speakers from the list of speakers. Omit data to remove yourself.
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Send PATCH {'user': <user_id>, 'marked': <bool>} to mark the speaker.
Checks also whether the requesting user can do this. He needs at
least the permissions 'agenda.can_see' (see
self.check_view_permissions()). In case of adding himself the
permission 'agenda.can_be_speaker' is required. In case of adding
someone else the permission 'agenda.can_manage' is required. In
case of removing someone else 'agenda.can_manage' is required. In
case of removing himself no other permission is required.
"""
# Retrieve item.
item = self.get_object()
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if request.method == "POST":
# Retrieve user_id
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user_id = request.data.get("user")
# Check permissions and other conditions. Get user instance.
if user_id is None:
# Add oneself
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if not has_perm(self.request.user, "agenda.can_be_speaker"):
self.permission_denied(request)
if item.speaker_list_closed:
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raise ValidationError({"detail": "The list of speakers is closed."})
user = self.request.user
else:
# Add someone else.
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if not has_perm(
self.request.user, "agenda.can_manage_list_of_speakers"
):
self.permission_denied(request)
try:
user = get_user_model().objects.get(pk=int(user_id))
except (ValueError, get_user_model().DoesNotExist):
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raise ValidationError({"detail": "User does not exist."})
# Try to add the user. This ensurse that a user is not twice in the
# list of coming speakers.
try:
Speaker.objects.add(user, item)
except OpenSlidesError as e:
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raise ValidationError({"detail": str(e)})
# Send new speaker via autoupdate because users without permission
# to see users may not have it but can get it now.
inform_changed_data([user])
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# Toggle 'marked' for the speaker
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elif request.method == "PATCH":
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# Check permissions
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if not has_perm(self.request.user, "agenda.can_manage_list_of_speakers"):
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self.permission_denied(request)
# Retrieve user_id
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user_id = request.data.get("user")
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try:
user = get_user_model().objects.get(pk=int(user_id))
except (ValueError, get_user_model().DoesNotExist):
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raise ValidationError({"detail": "User does not exist."})
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marked = request.data.get("marked")
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if not isinstance(marked, bool):
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raise ValidationError({"detail": "Marked has to be a bool."})
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queryset = Speaker.objects.filter(item=item, user=user, begin_time=None)
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try:
# We assume that there aren't multiple entries for speakers that
# did not yet begin to speak, because this
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# is forbidden by the Manager's add method. We assume that
# there is only one speaker instance or none.
speaker = queryset.get()
except Speaker.DoesNotExist:
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raise ValidationError(
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{"detail": "The user is not in the list of speakers."}
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)
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else:
speaker.marked = marked
speaker.save()
else:
# request.method == 'DELETE'
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speaker_ids = request.data.get("speaker")
# Check permissions and other conditions. Get speaker instance.
if speaker_ids is None:
# Remove oneself
queryset = Speaker.objects.filter(
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item=item, user=self.request.user
).exclude(weight=None)
try:
# We assume that there aren't multiple entries because this
# is forbidden by the Manager's add method. We assume that
# there is only one speaker instance or none.
speaker = queryset.get()
except Speaker.DoesNotExist:
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raise ValidationError(
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{"detail": "You are not on the list of speakers."}
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)
else:
speaker.delete()
else:
# Remove someone else.
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if not has_perm(
self.request.user, "agenda.can_manage_list_of_speakers"
):
self.permission_denied(request)
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if isinstance(speaker_ids, int):
speaker_ids = [speaker_ids]
deleted_speaker_count = 0
for speaker_id in speaker_ids:
try:
speaker = Speaker.objects.get(pk=int(speaker_id))
except (ValueError, Speaker.DoesNotExist):
pass
else:
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speaker.delete(skip_autoupdate=True)
deleted_speaker_count += 1
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# send autoupdate if speakers are deleted
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if deleted_speaker_count:
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inform_changed_data(item)
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return Response()
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@detail_route(methods=["PUT", "DELETE"])
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def speak(self, request, pk=None):
"""
Special view endpoint to begin and end speech of speakers. Send PUT
{'speaker': <speaker_id>} to begin speech. Omit data to begin speech of
the next speaker. Send DELETE to end speech of current speaker.
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"""
# Retrieve item.
item = self.get_object()
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if request.method == "PUT":
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# Retrieve speaker_id
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speaker_id = request.data.get("speaker")
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if speaker_id is None:
speaker = item.get_next_speaker()
if speaker is None:
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raise ValidationError({"detail": "The list of speakers is empty."})
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else:
try:
speaker = Speaker.objects.get(pk=int(speaker_id))
except (ValueError, Speaker.DoesNotExist):
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raise ValidationError({"detail": "Speaker does not exist."})
speaker.begin_speech()
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message = "User is now speaking."
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else:
# request.method == 'DELETE'
try:
# We assume that there aren't multiple entries because this
# is forbidden by the Model's begin_speech method. We assume that
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# there is only one speaker instance or none.
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current_speaker = (
Speaker.objects.filter(item=item, end_time=None)
.exclude(begin_time=None)
.get()
)
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except Speaker.DoesNotExist:
raise ValidationError(
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{
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"detail": f"There is no one speaking at the moment according to {item}."
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}
)
current_speaker.end_speech()
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message = "The speech is finished now."
# Initiate response.
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return Response({"detail": message})
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@detail_route(methods=["POST"])
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def sort_speakers(self, request, pk=None):
"""
Special view endpoint to sort the list of speakers.
Expects a list of IDs of the speakers.
"""
# Retrieve item.
item = self.get_object()
# Check data
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speaker_ids = request.data.get("speakers")
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if not isinstance(speaker_ids, list):
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raise ValidationError({"detail": "Invalid data."})
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# Get all speakers
speakers = {}
for speaker in item.speakers.filter(begin_time=None):
speakers[speaker.pk] = speaker
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# Check and sort speakers
valid_speakers = []
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for speaker_id in speaker_ids:
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if not isinstance(speaker_id, int) or speakers.get(speaker_id) is None:
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raise ValidationError({"detail": "Invalid data."})
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valid_speakers.append(speakers[speaker_id])
weight = 0
with transaction.atomic():
for speaker in valid_speakers:
speaker.weight = weight
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speaker.save(skip_autoupdate=True)
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weight += 1
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# send autoupdate
inform_changed_data(item)
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# Initiate response.
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return Response({"detail": "List of speakers successfully sorted."})
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@list_route(methods=["post"])
def numbering(self, request):
"""
Auto numbering of the agenda according to the config. Manually added
item numbers will be overwritten.
"""
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if not config["agenda_enable_numbering"]:
raise ValidationError(
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{"detail": "Numbering of agenda items is deactivated."}
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)
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Item.objects.number_all(numeral_system=config["agenda_numeral_system"])
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return Response({"detail": "The agenda has been numbered."})
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@list_route(methods=["post"])
def sort(self, request):
"""
Sort agenda items. Also checks parent field to prevent hierarchical
loops.
"""
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nodes = request.data.get("nodes", [])
parent_id = request.data.get("parent_id")
items = []
with transaction.atomic():
for index, node in enumerate(nodes):
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item = Item.objects.get(pk=node["id"])
item.parent_id = parent_id
item.weight = index
item.save(skip_autoupdate=True)
items.append(item)
# Now check consistency. TODO: Try to use less DB queries.
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item = Item.objects.get(pk=node["id"])
ancestor = item.parent
while ancestor is not None:
if ancestor == item:
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raise ValidationError(
{
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"detail": "There must not be a hierarchical loop. Please reload the page."
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}
)
ancestor = ancestor.parent
inform_changed_data(items)
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return Response({"detail": "The agenda has been sorted."})
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@list_route(methods=["post"])
@transaction.atomic
def assign(self, request):
"""
Assign multiple agenda items to a new parent item.
Send POST {... see schema ...} to assign the new parent.
This aslo checks the parent field to prevent hierarchical loops.
"""
schema = {
"$schema": "http://json-schema.org/draft-07/schema#",
"title": "Agenda items assign new parent schema",
"description": "An object containing an array of agenda item ids and the new parent id the items should be assigned to.",
"type": "object",
"propterties": {
"items": {
"description": "An array of agenda item ids where the items should be assigned to the new parent id.",
"type": "array",
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"items": {"type": "integer"},
"minItems": 1,
"uniqueItems": True,
},
"parent_id": {
"description": "The agenda item id of the new parent item.",
"type": "integer",
},
},
"required": ["items", "parent_id"],
}
# Validate request data.
try:
jsonschema.validate(request.data, schema)
except jsonschema.ValidationError as err:
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raise ValidationError({"detail": str(err)})
# Check parent item
try:
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parent = Item.objects.get(pk=request.data["parent_id"])
except Item.DoesNotExist:
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raise ValidationError(
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{"detail": f"Parent item {request.data['parent_id']} does not exist"}
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)
# Collect ancestors
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ancestors = [parent.pk]
grandparent = parent.parent
while grandparent is not None:
ancestors.append(grandparent.pk)
grandparent = grandparent.parent
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# First validate all items before changeing them.
items = []
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for item_id in request.data["items"]:
# Prevent hierarchical loops.
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if item_id in ancestors:
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raise ValidationError(
{
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"detail": f"Assigning item {item_id} to one of its children is not possible."
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}
)
# Check every item
try:
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items.append(Item.objects.get(pk=item_id))
except Item.DoesNotExist:
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raise ValidationError({"detail": f"Item {item_id} does not exist"})
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# OK, assign new parents.
for item in items:
# Assign new parent.
item.parent = parent
item.save(skip_autoupdate=True)
# Now inform all clients.
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inform_changed_data(items)
# Send response.
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return Response({"detail": f"{len(items)} items successfully assigned."})