import jsonschema from django.contrib.auth import get_user_model from django.db import transaction from openslides.core.config import config 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 openslides.utils.views import TreeSortMixin from ..utils.auth import has_perm from .access_permissions import ItemAccessPermissions from .models import Item, Speaker # Viewsets for the REST API class ItemViewSet( ListModelMixin, RetrieveModelMixin, UpdateModelMixin, TreeSortMixin, GenericViewSet ): """ API endpoint for agenda items. There are some views, see check_view_permissions. """ access_permissions = ItemAccessPermissions() queryset = Item.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 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. 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): """ Customized view endpoint to update all children if the item type has changed. We do not check the level (affected by changing the parent) in fact that this change is currentl only done via the sort view. """ old_type = self.get_object().type response = super().update(*args, **kwargs) # Update all children if the item type has changed. item = self.get_object() if old_type != item.type: items_to_update = [] # 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) return response @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': } to add a new speaker. Omit data to add yourself. Send DELETE {'speaker': } or DELETE {'speaker': [, , ...]} to remove one or more speakers from the list of speakers. Omit data to remove yourself. Send PATCH {'user': , 'marked': } 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() if request.method == "POST": # Retrieve user_id user_id = request.data.get("user") # Check permissions and other conditions. Get user instance. if user_id is None: # Add oneself if not has_perm(self.request.user, "agenda.can_be_speaker"): self.permission_denied(request) if item.speaker_list_closed: raise ValidationError({"detail": "The list of speakers is closed."}) user = self.request.user else: # Add someone else. 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): 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: 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]) # Toggle 'marked' for the speaker elif request.method == "PATCH": # Check permissions if not has_perm(self.request.user, "agenda.can_manage_list_of_speakers"): self.permission_denied(request) # Retrieve user_id user_id = request.data.get("user") try: user = get_user_model().objects.get(pk=int(user_id)) except (ValueError, get_user_model().DoesNotExist): raise ValidationError({"detail": "User does not exist."}) marked = request.data.get("marked") if not isinstance(marked, bool): raise ValidationError({"detail": "Marked has to be a bool."}) queryset = Speaker.objects.filter(item=item, user=user, begin_time=None) try: # We assume that there aren't multiple entries for speakers that # did not yet begin to speak, 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: raise ValidationError( {"detail": "The user is not in the list of speakers."} ) else: speaker.marked = marked speaker.save() else: # request.method == 'DELETE' 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( 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: raise ValidationError( {"detail": "You are not on the list of speakers."} ) else: speaker.delete() else: # Remove someone else. if not has_perm( self.request.user, "agenda.can_manage_list_of_speakers" ): self.permission_denied(request) 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: speaker.delete(skip_autoupdate=True) deleted_speaker_count += 1 # send autoupdate if speakers are deleted if deleted_speaker_count: inform_changed_data(item) return Response() @detail_route(methods=["PUT", "DELETE"]) def speak(self, request, pk=None): """ Special view endpoint to begin and end speech of speakers. Send PUT {'speaker': } to begin speech. Omit data to begin speech of the next speaker. Send DELETE to end speech of current speaker. """ # Retrieve item. item = self.get_object() if request.method == "PUT": # Retrieve speaker_id speaker_id = request.data.get("speaker") if speaker_id is None: speaker = item.get_next_speaker() if speaker is None: raise ValidationError({"detail": "The list of speakers is empty."}) else: try: speaker = Speaker.objects.get(pk=int(speaker_id)) except (ValueError, Speaker.DoesNotExist): raise ValidationError({"detail": "Speaker does not exist."}) speaker.begin_speech() message = "User is now speaking." 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 # there is only one speaker instance or none. current_speaker = ( Speaker.objects.filter(item=item, end_time=None) .exclude(begin_time=None) .get() ) except Speaker.DoesNotExist: raise ValidationError( { "detail": f"There is no one speaking at the moment according to {item}." } ) current_speaker.end_speech() message = "The speech is finished now." # Initiate response. return Response({"detail": message}) @detail_route(methods=["POST"]) 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 speaker_ids = request.data.get("speakers") if not isinstance(speaker_ids, list): raise ValidationError({"detail": "Invalid data."}) # Get all speakers speakers = {} for speaker in item.speakers.filter(begin_time=None): speakers[speaker.pk] = speaker # Check and sort speakers valid_speakers = [] for speaker_id in speaker_ids: if not isinstance(speaker_id, int) or speakers.get(speaker_id) is None: raise ValidationError({"detail": "Invalid data."}) valid_speakers.append(speakers[speaker_id]) weight = 0 with transaction.atomic(): for speaker in valid_speakers: speaker.weight = weight speaker.save(skip_autoupdate=True) weight += 1 # send autoupdate inform_changed_data(item) # Initiate response. return Response({"detail": "List of speakers successfully sorted."}) @list_route(methods=["post"]) def numbering(self, request): """ Auto numbering of the agenda according to the config. Manually added item numbers will be overwritten. """ if not config["agenda_enable_numbering"]: raise ValidationError( {"detail": "Numbering of agenda items is deactivated."} ) Item.objects.number_all(numeral_system=config["agenda_numeral_system"]) return Response({"detail": "The agenda has been numbered."}) @list_route(methods=["post"]) def sort(self, request): """ Sorts the whole agenda represented in a tree of ids. The request data should be a list (the root) of all main agenda items. Each node is a dict with an id and optional children: { id: children: [ ] } Every id has to be given. """ return self.sort_tree(request, Item, "weight", "parent_id") @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", "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: raise ValidationError({"detail": str(err)}) # Check parent item try: parent = Item.objects.get(pk=request.data["parent_id"]) except Item.DoesNotExist: raise ValidationError( {"detail": f"Parent item {request.data['parent_id']} does not exist"} ) # Collect ancestors ancestors = [parent.pk] grandparent = parent.parent while grandparent is not None: ancestors.append(grandparent.pk) grandparent = grandparent.parent # First validate all items before changeing them. items = [] for item_id in request.data["items"]: # Prevent hierarchical loops. if item_id in ancestors: raise ValidationError( { "detail": f"Assigning item {item_id} to one of its children is not possible." } ) # Check every item try: items.append(Item.objects.get(pk=item_id)) except Item.DoesNotExist: raise ValidationError({"detail": f"Item {item_id} does not exist"}) # OK, assign new parents. for item in items: # Assign new parent. item.parent = parent item.save(skip_autoupdate=True) # Now inform all clients. inform_changed_data(items) # Send response. return Response({"detail": f"{len(items)} items successfully assigned."})