96 lines
3.1 KiB
Python
96 lines
3.1 KiB
Python
#!/usr/bin/env python3
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# Copyright (C) 2009-2022 Jérôme Poisson (goffi@goffi.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 Optional
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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 wokkel import disco
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from zope.interface import implementer
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from libervia.backend.core.constants import Const as C
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from libervia.backend.core.i18n import _
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from libervia.backend.core.log import getLogger
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log = getLogger(__name__)
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PLUGIN_INFO = {
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C.PI_NAME: "Fallback Indication",
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C.PI_IMPORT_NAME: "XEP-0428",
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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-0428"],
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C.PI_MAIN: "XEP_0428",
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C.PI_HANDLER: "yes",
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C.PI_DESCRIPTION: _("""Implementation of XEP-0428 (Fallback Indication)"""),
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}
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NS_FALLBACK = "urn:xmpp:fallback:0"
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class XEP_0428:
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def __init__(self, host):
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log.info(_("XEP-0428 (Fallback Indication) plugin initialization"))
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host.register_namespace("fallback", NS_FALLBACK)
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def add_fallback_elt(
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self,
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message_elt: domish.Element,
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for_: str,
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msg: str|None = None
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) -> None:
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"""Add the fallback indication element
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@param message_elt: <message> element where the indication must be
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set
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@param for_: Specification namespace that the fallback is meant to replace.
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see https://xmpp.org/extensions/xep-0428.html#sect-idm46381699903600
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@param msg: message to show as fallback
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Will be added as <body>
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"""
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fallback_elt = message_elt.addElement((NS_FALLBACK, "fallback"))
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fallback_elt["for"] = for_
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if msg is not None:
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body_elt = message_elt.body
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if body_elt is None:
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message_elt.addElement("body", content=msg)
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else:
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body_elt.addContent(msg)
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def has_fallback(self, message_elt: domish.Element) -> bool:
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"""Tell if a message has a fallback indication"""
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try:
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next(message_elt.elements(NS_FALLBACK, "fallback"))
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except StopIteration:
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return False
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else:
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return True
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def get_handler(self, __):
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return XEP_0428_handler()
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@implementer(disco.IDisco)
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class XEP_0428_handler(xmlstream.XMPPHandler):
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def getDiscoInfo(self, __, target, nodeIdentifier=""):
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return [disco.DiscoFeature(NS_FALLBACK)]
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def getDiscoItems(self, requestor, target, nodeIdentifier=""):
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return []
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