OpenSlides/openslides/utils/consumers.py

393 lines
15 KiB
Python
Raw Normal View History

from typing import Any, Dict, List, Optional
import jsonschema
from asgiref.sync import sync_to_async
from channels.db import database_sync_to_async
from channels.generic.websocket import AsyncJsonWebsocketConsumer
from ..core.config import config
from ..core.models import Projector
from .auth import async_anonymous_is_enabled, has_perm
from .cache import element_cache, split_element_id
from .collection import (
Collection,
CollectionElement,
format_for_autoupdate,
from_channel_message,
)
2018-08-30 09:07:06 +02:00
from .constants import get_constants
class ProtocollAsyncJsonWebsocketConsumer(AsyncJsonWebsocketConsumer):
"""
Mixin for JSONWebsocketConsumers, that speaks the a special protocol.
"""
schema = {
"$schema": "http://json-schema.org/draft-04/schema#",
"title": "OpenSlidesWebsocketProtocol",
"description": "The base packages that OpenSlides sends between the server and the client.",
"type": "object",
"properties": {
"type": {
"description": "Defines what kind of packages is packed.",
"type": "string",
2018-08-30 09:07:06 +02:00
"pattern": "notify|constants", # The server can sent other types
},
"content": {
"description": "The content of the package.",
},
"id": {
"description": "An identifier of the package.",
"type": "string",
},
"in_response": {
"description": "The id of another package that the other part sent before.",
"type": "string",
}
},
"required": ["type", "content", "id"],
}
async def send_json(self, type: str, content: Any, id: Optional[str] = None, in_response: Optional[str] = None) -> None:
"""
Sends the data with the type.
"""
out = {'type': type, 'content': content}
if id:
out['id'] = id
if in_response:
out['in_response'] = in_response
await super().send_json(out)
async def receive_json(self, content: Any) -> None:
"""
Receives the json data, parses it and calls receive_content.
"""
try:
jsonschema.validate(content, self.schema)
except jsonschema.ValidationError as err:
try:
in_response = content['id']
except (TypeError, KeyError):
# content is not a dict (TypeError) or has not the key id (KeyError)
in_response = None
await self.send_json(
type='error',
content=str(err),
in_response=in_response)
return
await self.receive_content(type=content['type'], content=content['content'], id=content['id'])
async def receive_content(self, type: str, content: object, id: str) -> None:
raise NotImplementedError("ProtocollAsyncJsonWebsocketConsumer needs the method receive_content()")
class SiteConsumer(ProtocollAsyncJsonWebsocketConsumer):
"""
Websocket Consumer for the site.
"""
groups = ['site']
async def connect(self) -> None:
"""
A user connects to the site.
If it is an anonymous user and anonymous is disabled, the connection is closed.
Sends the startup data to the user.
"""
# TODO: add a way to ask for the data since a change_id and send only data that is newer
if not await async_anonymous_is_enabled() and self.scope['user'].id is None:
await self.close()
else:
await self.accept()
data = await startup_data(self.scope['user'])
await self.send_json(type='autoupdate', content=data)
async def receive_content(self, type: str, content: Any, id: str) -> None:
"""
If we recieve something from the client we currently just interpret this
as a notify message.
The server adds the sender's user id (0 for anonymous) and reply
channel name so that a receiver client may reply to the sender or to all
sender's instances.
"""
if type == 'notify':
if notify_message_is_valid(content):
await self.channel_layer.group_send(
"projector",
{
"type": "send_notify",
"incomming": content,
"senderReplyChannelName": self.channel_name,
"senderUserId": self.scope['user'].id or 0,
},
)
await self.channel_layer.group_send(
"site",
{
"type": "send_notify",
"incomming": content,
"senderReplyChannelName": self.channel_name,
"senderUserId": self.scope['user'].id or 0,
},
)
else:
await self.send_json(type='error', content='Invalid notify message', in_response=id)
2018-08-30 09:07:06 +02:00
elif type == 'constants':
# Return all constants to the client.
await self.send_json(type='constants', content=get_constants(), in_response=id)
async def send_notify(self, event: Dict[str, Any]) -> None:
"""
Send a notify message to the user.
"""
user_id = self.scope['user'].id or 0
out = []
for item in event['incomming']:
users = item.get('users')
reply_channels = item.get('replyChannels')
projectors = item.get('projectors')
if ((isinstance(users, list) and user_id in users)
or (isinstance(reply_channels, list) and self.channel_name in reply_channels)
or (users is None and reply_channels is None and projectors is None)):
item['senderReplyChannelName'] = event.get('senderReplyChannelName')
item['senderUserId'] = event.get('senderUserId')
item['senderProjectorId'] = event.get('senderProjectorId')
out.append(item)
if out:
await self.send_json(type='notify', content=out)
async def send_data(self, event: Dict[str, Any]) -> None:
"""
Send changed or deleted elements to the user.
"""
change_id = event['change_id']
output = []
changed_elements, deleted_elements = await element_cache.get_restricted_data(self.scope['user'], change_id)
for collection_string, elements in changed_elements.items():
for element in elements:
output.append(format_for_autoupdate(
collection_string=collection_string,
id=element['id'],
action='changed',
data=element))
for element_id in deleted_elements:
collection_string, id = split_element_id(element_id)
output.append(format_for_autoupdate(
collection_string=collection_string,
id=id,
action='deleted'))
await self.send_json(type='autoupdate', content=output)
class ProjectorConsumer(ProtocollAsyncJsonWebsocketConsumer):
"""
Websocket Consumer for the projector.
"""
groups = ['projector']
async def connect(self) -> None:
"""
Adds the websocket connection to a group specific to the projector with the given id.
Also sends all data that are shown on the projector.
"""
user = self.scope['user']
projector_id = self.scope["url_route"]["kwargs"]["projector_id"]
await self.accept()
if not await database_sync_to_async(has_perm)(user, 'core.can_see_projector'):
await self.send_json(type='error', content='No permissions to see this projector.')
# TODO: Shouldend we just close the websocket connection with an error message?
# self.close(code=4403)
else:
out = await sync_to_async(projector_startup_data)(projector_id)
await self.send_json(type='autoupdate', content=out)
async def receive_content(self, type: str, content: Any, id: str) -> None:
"""
If we recieve something from the client we currently just interpret this
as a notify message.
The server adds the sender's user id (0 for anonymous) and reply
channel name so that a receiver client may reply to the sender or to all
sender's instances.
"""
projector_id = self.scope["url_route"]["kwargs"]["projector_id"]
await self.channel_layer.group_send(
"projector",
{
"type": "send_notify",
"incomming": content,
"senderReplyChannelName": self.channel_name,
"senderProjectorId": projector_id,
},
)
await self.channel_layer.group_send(
"site",
{
"type": "send_notify",
"incomming": content,
"senderReplyChannelName": self.channel_name,
"senderProjectorId": projector_id,
},
)
async def send_notify(self, event: Dict[str, Any]) -> None:
"""
Send a notify message to the projector.
"""
projector_id = self.scope["url_route"]["kwargs"]["projector_id"]
out = []
for item in event['incomming']:
users = item.get('users')
reply_channels = item.get('replyChannels')
projectors = item.get('projectors')
if ((isinstance(projectors, list) and projector_id in projectors)
or (isinstance(reply_channels, list) and self.channel_name in reply_channels)
or (users is None and reply_channels is None and projectors is None)):
item['senderReplyChannelName'] = event.get('senderReplyChannelName')
item['senderUserId'] = event.get('senderUserId')
item['senderProjectorId'] = event.get('senderProjectorId')
out.append(item)
if out:
await self.send_json(type='notify', content=out)
async def send_data(self, event: Dict[str, Any]) -> None:
"""
Informs all projector clients about changed data.
"""
projector_id = self.scope["url_route"]["kwargs"]["projector_id"]
collection_elements = from_channel_message(event['message'])
output = await projector_sync_send_data(projector_id, collection_elements)
if output:
await self.send_json(type='autoupdate', content=output)
async def startup_data(user: Optional[CollectionElement], change_id: int = 0) -> List[Any]:
"""
Returns all data for startup.
"""
# TODO: use the change_id argument
output = []
restricted_data = await element_cache.get_all_restricted_data(user)
for collection_string, elements in restricted_data.items():
for element in elements:
formatted_data = format_for_autoupdate(
collection_string=collection_string,
id=element['id'],
action='changed',
data=element)
output.append(formatted_data)
return output
def projector_startup_data(projector_id: int) -> Any:
"""
Generate the startup data for a projector.
"""
try:
projector = Projector.objects.get(pk=projector_id)
except Projector.DoesNotExist:
return {'text': 'The projector {} does not exist.'.format(projector_id)}
else:
# Now check whether broadcast is active at the moment. If yes,
# change the local projector variable.
if config['projector_broadcast'] > 0:
projector = Projector.objects.get(pk=config['projector_broadcast'])
# Collect all elements that are on the projector.
2018-08-22 22:00:08 +02:00
output = []
for requirement in projector.get_all_requirements():
required_collection_element = CollectionElement.from_instance(requirement)
output.append(required_collection_element.as_autoupdate_for_projector())
# Collect all config elements.
config_collection = Collection(config.get_collection_string())
projector_data = (config_collection.get_access_permissions()
.get_projector_data(config_collection.get_full_data()))
for data in projector_data:
output.append(format_for_autoupdate(
config_collection.collection_string,
data['id'],
'changed',
data))
# Collect the projector instance.
collection_element = CollectionElement.from_instance(projector)
output.append(collection_element.as_autoupdate_for_projector())
# Send all the data that were only collected before.
return output
@sync_to_async
def projector_sync_send_data(projector_id: int, collection_elements: List[CollectionElement]) -> List[Any]:
"""
sync function that generates the elements for an projector.
"""
# Load the projector object. If broadcast is on, use the broadcast projector
# instead.
if config['projector_broadcast'] > 0:
projector_id = config['projector_broadcast']
projector = Projector.objects.get(pk=projector_id)
# TODO: This runs once for every open projector tab. Either use
# caching or something else, so this is only called once
output = []
for collection_element in collection_elements:
if collection_element.is_deleted():
output.append(collection_element.as_autoupdate_for_projector())
else:
for element in projector.get_collection_elements_required_for_this(collection_element):
output.append(element.as_autoupdate_for_projector())
return output
def notify_message_is_valid(message: object) -> bool:
"""
Returns True, when the message is a valid notify_message.
"""
schema = {
"$schema": "http://json-schema.org/draft-04/schema#",
"title": "Notify elements.",
"description": "Elements that one client can send to one or many other clients.",
"type": "array",
"items": {
"type": "object",
"properties": {
"projectors": {
"type": "array",
"items": {"type": "integer"},
},
"reply_channels": {
"type": "array",
"items": {"type": "string"},
},
"users": {
"type": "array",
"items": {"type": "integer"},
}
}
},
"minItems": 1,
}
try:
jsonschema.validate(message, schema)
except jsonschema.ValidationError:
return False
else:
return True