280 lines
7.9 KiB
Python
280 lines
7.9 KiB
Python
from django.conf import settings
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from django.contrib.contenttypes.models import ContentType
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from django.contrib.sessions.models import Session as DjangoSession
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from django.db import models
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from jsonfield import JSONField
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from openslides.mediafiles.models import Mediafile
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from openslides.utils.models import RESTModelMixin
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from openslides.utils.projector import ProjectorElement
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from .access_permissions import (
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ChatMessageAccessPermissions,
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ConfigAccessPermissions,
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CustomSlideAccessPermissions,
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ProjectorAccessPermissions,
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TagAccessPermissions,
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)
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from .exceptions import ProjectorException
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class Projector(RESTModelMixin, models.Model):
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"""
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Model for all projectors. At the moment we support only one projector,
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the default projector (pk=1).
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The config field contains a dictionary which uses UUIDs as keys. Every
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element must have at least the property "name". The property "stable"
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is to set whether this element should disappear on prune or clear
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requests.
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Example:
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{
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"881d875cf01741718ca926279ac9c99c": {
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"name": "core/customslide",
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"id": 1
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},
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"191c0878cdc04abfbd64f3177a21891a": {
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"name": "core/countdown",
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"stable": true,
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"status": "stop",
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"countdown_time": 20,
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"visable": true,
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"default": 42
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},
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"db670aa8d3ed4aabb348e752c75aeaaf": {
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"name": "core/clock",
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"stable": true
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}
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}
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If the config field is empty or invalid the projector shows a default
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slide.
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There are two additional fields to control the behavior of the projector
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view itself: scale and scroll.
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The projector can be controlled using the REST API with POST requests
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on e. g. the URL /rest/core/projector/1/activate_elements/.
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"""
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access_permissions = ProjectorAccessPermissions()
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config = JSONField()
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scale = models.IntegerField(default=0)
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scroll = models.IntegerField(default=0)
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# currently unused, but important for the multiprojector.
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width = models.PositiveIntegerField(default=1024)
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height = models.PositiveIntegerField(default=768)
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class Meta:
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"""
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Contains general permissions that can not be placed in a specific app.
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"""
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default_permissions = ()
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permissions = (
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('can_see_projector', 'Can see the projector'),
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('can_manage_projector', 'Can manage the projector'),
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('can_see_frontpage', 'Can see the front page'),)
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@property
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def elements(self):
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"""
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Retrieve all projector elements given in the config field. For
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every element the method check_and_update_data() is called and its
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result is also used.
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"""
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# Get all elements from all apps.
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elements = {}
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for element in ProjectorElement.get_all():
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elements[element.name] = element
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# Parse result
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result = {}
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for key, value in self.config.items():
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# Use a copy here not to change the origin value in the config field.
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result[key] = value.copy()
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result[key]['uuid'] = key
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element = elements.get(value['name'])
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if element is None:
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result[key]['error'] = 'Projector element does not exist.'
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else:
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try:
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result[key].update(element.check_and_update_data(
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projector_object=self,
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config_entry=value))
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except ProjectorException as e:
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result[key]['error'] = str(e)
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return result
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@classmethod
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def get_all_requirements(cls):
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"""
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Generator which returns all ProjectorRequirement instances of all
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active projector elements.
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"""
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# Get all elements from all apps.
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elements = {}
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for element in ProjectorElement.get_all():
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elements[element.name] = element
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# Generator
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for projector in cls.objects.all():
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for key, value in projector.config.items():
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element = elements.get(value['name'])
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if element is not None:
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for requirement in element.get_requirements(value):
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yield requirement
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class CustomSlide(RESTModelMixin, models.Model):
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"""
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Model for slides with custom content.
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"""
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access_permissions = CustomSlideAccessPermissions()
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title = models.CharField(
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max_length=256)
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text = models.TextField(
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blank=True)
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weight = models.IntegerField(
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default=0)
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attachments = models.ManyToManyField(
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Mediafile,
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blank=True)
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class Meta:
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default_permissions = ()
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ordering = ('weight', 'title', )
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def __str__(self):
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return self.title
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@property
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def agenda_item(self):
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"""
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Returns the related agenda item.
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"""
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# TODO: Move the agenda app in the core app to fix circular dependencies
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from openslides.agenda.models import Item
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content_type = ContentType.objects.get_for_model(self)
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return Item.objects.get(object_id=self.pk, content_type=content_type)
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@property
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def agenda_item_id(self):
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"""
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Returns the id of the agenda item object related to this object.
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"""
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return self.agenda_item.pk
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def get_agenda_title(self):
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return self.title
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def get_agenda_list_view_title(self):
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return self.title
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def get_search_index_string(self):
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"""
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Returns a string that can be indexed for the search.
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"""
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return " ".join((
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self.title,
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self.text))
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class Tag(RESTModelMixin, models.Model):
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"""
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Model for tags. This tags can be used for other models like agenda items,
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motions or assignments.
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"""
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access_permissions = TagAccessPermissions()
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name = models.CharField(
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max_length=255,
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unique=True)
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class Meta:
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ordering = ('name',)
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default_permissions = ()
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permissions = (
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('can_manage_tags', 'Can manage tags'),)
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def __str__(self):
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return self.name
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class ConfigStore(RESTModelMixin, models.Model):
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"""
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A model class to store all config variables in the database.
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"""
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access_permissions = ConfigAccessPermissions()
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key = models.CharField(max_length=255, unique=True, db_index=True)
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"""A string, the key of the config variable."""
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value = JSONField()
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"""The value of the config variable. """
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class Meta:
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default_permissions = ()
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permissions = (
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('can_manage_config', 'Can manage configuration'),)
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@classmethod
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def get_collection_string(cls):
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return 'core/config'
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def get_rest_pk(self):
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"""
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Returns the primary key used in the REST API.
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"""
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return self.key
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class ChatMessage(RESTModelMixin, models.Model):
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"""
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Model for chat messages.
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At the moment we only have one global chat room for managers.
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"""
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access_permissions = ChatMessageAccessPermissions()
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message = models.TextField()
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timestamp = models.DateTimeField(auto_now_add=True)
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user = models.ForeignKey(
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settings.AUTH_USER_MODEL,
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on_delete=models.CASCADE)
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class Meta:
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default_permissions = ()
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permissions = (
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('can_use_chat', 'Can use the chat'),)
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def __str__(self):
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return 'Message {}'.format(self.timestamp)
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class Session(DjangoSession):
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"""
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Model like the Django db session, which saves the user as ForeignKey instead
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of an encoded value.
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"""
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user = models.ForeignKey(
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settings.AUTH_USER_MODEL,
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on_delete=models.CASCADE,
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null=True)
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class Meta:
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default_permissions = ()
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@classmethod
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def get_session_store_class(cls):
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from .session_backend import SessionStore
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return SessionStore
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