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# Copyright (C) 2018 Philipp Hörist <philipp AT hoerist.com>
#
# This file is part of nbxmpp.
#
# SPDX-License-Identifier: GPL-3.0-or-later
from __future__ import annotations
from typing import TYPE_CHECKING
import hashlib
from dataclasses import dataclass
from nbxmpp.errors import StanzaError
from nbxmpp.modules.base import BaseModule
from nbxmpp.namespaces import Namespace
from nbxmpp.protocol import Iq
from nbxmpp.protocol import Message
from nbxmpp.simplexml import Node
from nbxmpp.structs import MessageProperties
from nbxmpp.structs import StanzaHandler
from nbxmpp.task import iq_request_task
from nbxmpp.util import from_xs_boolean
if TYPE_CHECKING:
from nbxmpp.client import Client
class SecurityLabels(BaseModule):
def __init__(self, client: Client) -> None:
BaseModule.__init__(self, client)
self._client = client
self.handlers = [
StanzaHandler(
name="message",
callback=self._process_message_security_label,
ns=Namespace.SECLABEL,
priority=15,
),
]
def _process_message_security_label(
self, _client: Client, stanza: Message, properties: MessageProperties
) -> None:
security = stanza.getTag("securitylabel", namespace=Namespace.SECLABEL)
if security is None:
return
try:
security_label = SecurityLabel.from_node(security)
except ValueError as error:
self._log.warning(error)
return
properties.security_label = security_label
@iq_request_task
def request_catalog(self, jid: str):
_task = yield
response = yield _make_catalog_request(self._client.domain, jid)
if response.isError():
raise StanzaError(response)
catalog_node = response.getTag("catalog", namespace=Namespace.SECLABEL_CATALOG)
try:
restrict = from_xs_boolean(catalog_node.getAttr("restrict"))
except Exception:
restrict = False
items = catalog_node.getTags("item")
labels: dict[str, SecurityLabel | None] = {}
default: str | None = None
for item in items:
selector = item.getAttr("selector")
if selector is None:
continue
if item.getAttr("default") == "true":
default = selector
security = item.getTag("securitylabel", namespace=Namespace.SECLABEL)
if security is None:
labels[selector] = None
continue
try:
security_label = SecurityLabel.from_node(security)
except ValueError:
continue
labels[selector] = security_label
yield Catalog(labels=labels, default=default, restrict=restrict)
def _make_catalog_request(domain: str | None, jid: str) -> Iq:
iq = Iq(typ="get", to=domain)
iq.addChild(name="catalog", namespace=Namespace.SECLABEL_CATALOG, attrs={"to": jid})
return iq
@dataclass
class Displaymarking:
name: str
fgcolor: str
bgcolor: str
def to_node(self) -> Node:
displaymarking = Node(tag="displaymarking")
if self.fgcolor and self.fgcolor != "#000":
displaymarking.setAttr("fgcolor", self.fgcolor)
if self.bgcolor and self.bgcolor != "#FFF":
displaymarking.setAttr("bgcolor", self.bgcolor)
if self.name:
displaymarking.setData(self.name)
return displaymarking
@classmethod
def from_node(cls, node: Node) -> Displaymarking:
return cls(
name=node.getData(),
fgcolor=node.getAttr("fgcolor") or "#000",
bgcolor=node.getAttr("bgcolor") or "#FFF",
)
@dataclass
class SecurityLabel:
displaymarking: Displaymarking | None
label: Node
def to_node(self) -> Node:
security = Node(tag="securitylabel", attrs={"xmlns": Namespace.SECLABEL})
if self.displaymarking is not None:
security.addChild(node=self.displaymarking.to_node())
security.addChild(node=self.label)
return security
@classmethod
def from_node(cls, security: Node) -> SecurityLabel:
displaymarking = security.getTag("displaymarking")
if displaymarking is not None:
displaymarking = Displaymarking.from_node(displaymarking)
label = security.getTag("label")
if label is None:
raise ValueError("label node missing")
return cls(displaymarking=displaymarking, label=label)
def get_label_hash(self) -> str:
sha = hashlib.sha512()
sha.update(str(self.label).encode())
return sha.hexdigest()
@dataclass
class Catalog:
labels: dict[str, SecurityLabel | None]
default: str
restrict: bool
def get_label_names(self) -> list[str]:
return list(self.labels.keys())
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