144 lines
5 KiB
Python
144 lines
5 KiB
Python
#!/usr/bin/env python3
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# SAT plugin for Delayed Delivery (XEP-0334)
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# Copyright (C) 2009-2021 Jérôme Poisson (goffi@goffi.org)
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# Copyright (C) 2013-2016 Adrien Cossa (souliane@mailoo.org)
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU Affero General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU Affero General Public License for more details.
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# You should have received a copy of the GNU Affero General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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from typing import Iterable
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from libervia.backend.core.i18n import _, D_
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from libervia.backend.core.log import getLogger
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log = getLogger(__name__)
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from libervia.backend.core.constants import Const as C
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from libervia.backend.tools.common import data_format
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from wokkel import disco, iwokkel
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from twisted.words.protocols.jabber import xmlstream
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from twisted.words.xish import domish
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from zope.interface import implementer
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from textwrap import dedent
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PLUGIN_INFO = {
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C.PI_NAME: "Message Processing Hints",
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C.PI_IMPORT_NAME: "XEP-0334",
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C.PI_TYPE: "XEP",
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C.PI_MODES: C.PLUG_MODE_BOTH,
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C.PI_PROTOCOLS: ["XEP-0334"],
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C.PI_MAIN: "XEP_0334",
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C.PI_HANDLER: "yes",
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C.PI_DESCRIPTION: D_("""Implementation of Message Processing Hints"""),
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C.PI_USAGE: dedent(
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D_(
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"""\
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Frontends can use HINT_* constants in mess_data['extra'] in a serialized 'hints' dict.
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Internal plugins can use directly add_hint([HINT_* constant]).
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Will set mess_data['extra']['history'] to 'skipped' when no store is requested and message is not saved in history."""
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)
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),
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}
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NS_HINTS = "urn:xmpp:hints"
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class XEP_0334(object):
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HINT_NO_PERMANENT_STORE = "no-permanent-store"
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HINT_NO_STORE = "no-store"
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HINT_NO_COPY = "no-copy"
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HINT_STORE = "store"
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HINTS = (HINT_NO_PERMANENT_STORE, HINT_NO_STORE, HINT_NO_COPY, HINT_STORE)
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def __init__(self, host):
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log.info(_("Message Processing Hints plugin initialization"))
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self.host = host
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host.trigger.add("sendMessage", self.send_message_trigger)
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host.trigger.add(
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"message_received", self.message_received_trigger, priority=-1000
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)
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def get_handler(self, client):
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return XEP_0334_handler()
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def add_hint(self, mess_data, hint):
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if hint == self.HINT_NO_COPY and not mess_data["to"].resource:
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log.error(
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"{hint} can only be used with full jids! Ignoring it.".format(hint=hint)
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)
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return
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hints = mess_data.setdefault("hints", set())
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if hint in self.HINTS:
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hints.add(hint)
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else:
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log.error("Unknown hint: {}".format(hint))
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def add_hint_elements(
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self, message_elt: domish.Element, hints: Iterable[str]
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) -> None:
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"""Add hints elements to message stanza
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@param message_elt: stanza where hints must be added
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@param hints: hints to add
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"""
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for hint in hints:
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if not list(message_elt.elements(NS_HINTS, hint)):
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message_elt.addElement((NS_HINTS, hint))
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else:
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log.debug(f"Not adding {hint!r} hint: it is already present in <message>")
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def _send_post_xml_treatment(self, mess_data):
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if "hints" in mess_data:
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self.add_hint_elements(mess_data["xml"], mess_data["hints"])
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return mess_data
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def send_message_trigger(
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self, client, mess_data, pre_xml_treatments, post_xml_treatments
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):
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"""Add the hints element to the message to be sent"""
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if "hints" in mess_data["extra"]:
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for hint in data_format.dict2iter("hints", mess_data["extra"], pop=True):
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self.add_hint(hint)
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post_xml_treatments.addCallback(self._send_post_xml_treatment)
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return True
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def _received_skip_history(self, mess_data):
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mess_data["history"] = C.HISTORY_SKIP
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return mess_data
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def message_received_trigger(self, client, message_elt, post_treat):
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"""Check for hints in the received message"""
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for elt in message_elt.elements():
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if elt.uri == NS_HINTS and elt.name in (
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self.HINT_NO_PERMANENT_STORE,
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self.HINT_NO_STORE,
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):
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log.debug("history will be skipped for this message, as requested")
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post_treat.addCallback(self._received_skip_history)
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break
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return True
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@implementer(iwokkel.IDisco)
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class XEP_0334_handler(xmlstream.XMPPHandler):
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def getDiscoInfo(self, requestor, target, nodeIdentifier=""):
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return [disco.DiscoFeature(NS_HINTS)]
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def getDiscoItems(self, requestor, target, nodeIdentifier=""):
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return []
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