OpenSlides/openslides/core/signals.py

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from django.apps import apps
from django.contrib.auth.models import Permission
from django.contrib.contenttypes.models import ContentType
from django.db.models import Q
from django.dispatch import Signal
from ..utils.auth import has_perm
from ..utils.collection import Collection
from .models import ChatMessage
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# This signal is send when the migrate command is done. That means it is sent
# after post_migrate sending and creating all Permission objects. Don't use it
# for other things than dealing with Permission objects.
post_permission_creation = Signal()
# This signal is sent if a permission is changed (e. g. a group gets a new
# permission). Connected receivers may yield Collections.
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permission_change = Signal()
# This signal is sent if someone wants to see basic user data. Connected
# receivers may answer a set of user ids that are required for the request
# user (this can be anything that is allowd as argument for
# utils.auth.has_perm()) e. g. as motion submitter or assignment candidate.
user_data_required = Signal(providing_args=['request_user'])
def delete_django_app_permissions(sender, **kwargs):
"""
Deletes the permissions, Django creates by default. Only required
for auth, contenttypes and sessions.
"""
contenttypes = ContentType.objects.filter(
Q(app_label='auth') |
Q(app_label='contenttypes') |
Q(app_label='sessions'))
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Permission.objects.filter(content_type__in=contenttypes).delete()
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def get_permission_change_data(sender, permissions, **kwargs):
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"""
Yields all necessary collections if the respective permissions change.
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"""
core_app = apps.get_app_config(app_label='core')
for permission in permissions:
if permission.content_type.app_label == core_app.label:
if permission.codename == 'can_see_projector':
yield Collection(core_app.get_model('Projector').get_collection_string())
elif permission.codename == 'can_manage_projector':
yield Collection(core_app.get_model('ProjectorMessage').get_collection_string())
yield Collection(core_app.get_model('Countdown').get_collection_string())
elif permission.codename == 'can_use_chat':
yield Collection(core_app.get_model('ChatMessage').get_collection_string())
def required_users(sender, request_user, **kwargs):
"""
Returns all user ids that are displayed as chatters if request_user can
use the chat. This function may return an empty set.
"""
chatters = set()
if has_perm(request_user, 'core.can_use_chat'):
for chat_message_collection_element in Collection(ChatMessage.get_collection_string()).element_generator():
full_data = chat_message_collection_element.get_full_data()
chatters.add(full_data['user_id'])
return chatters