Mercurial > libervia-backend
view libervia/backend/plugins/plugin_xep_0106.py @ 4306:94e0968987cd
plugin XEP-0033: code modernisation, improve delivery, data validation:
- Code has been rewritten using Pydantic models and `async` coroutines for data validation
and cleaner element parsing/generation.
- Delivery has been completely rewritten. It now works even if server doesn't support
multicast, and send to local multicast service first. Delivering to local multicast
service first is due to bad support of XEP-0033 in server (notably Prosody which has an
incomplete implementation), and the current impossibility to detect if a sub-domain
service handles fully multicast or only for local domains. This is a workaround to have
a good balance between backward compatilibity and use of bandwith, and to make it work
with the incoming email gateway implementation (the gateway will only deliver to
entities of its own domain).
- disco feature checking now uses `async` corountines. `host` implementation still use
Deferred return values for compatibility with legacy code.
rel 450
author | Goffi <goffi@goffi.org> |
---|---|
date | Thu, 26 Sep 2024 16:12:01 +0200 |
parents | 060d695ae98e |
children |
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#!/usr/bin/env python3 # SAT plugin for Explicit Message Encryption # Copyright (C) 2009-2021 Jérôme Poisson (goffi@goffi.org) # This program is free software: you can redistribute it and/or modify # it under the terms of the GNU Affero General Public License as published by # the Free Software Foundation, either version 3 of the License, or # (at your option) any later version. # This program is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU Affero General Public License for more details. # You should have received a copy of the GNU Affero General Public License # along with this program. If not, see <http://www.gnu.org/licenses/>. from libervia.backend.core.i18n import _ from libervia.backend.core.constants import Const as C from libervia.backend.core.log import getLogger from twisted.words.protocols.jabber import xmlstream from zope.interface import implementer from wokkel import disco log = getLogger(__name__) PLUGIN_INFO = { C.PI_NAME: "JID Escaping", C.PI_IMPORT_NAME: "XEP-0106", C.PI_TYPE: "XEP", C.PI_MODES: C.PLUG_MODE_BOTH, C.PI_PROTOCOLS: ["XEP-0106"], C.PI_DEPENDENCIES: [], C.PI_MAIN: "XEP_0106", C.PI_HANDLER: "yes", C.PI_DESCRIPTION: _("""(Un)escape JID to use disallowed chars in local parts"""), } NS_JID_ESCAPING = r"jid\20escaping" ESCAPE_MAP = { " ": r"\20", '"': r"\22", "&": r"\26", "'": r"\27", "/": r"\2f", ":": r"\3a", "<": r"\3c", ">": r"\3e", "@": r"\40", "\\": r"\5c", } class XEP_0106(object): def __init__(self, host): self.reverse_map = {v: k for k, v in ESCAPE_MAP.items()} def get_handler(self, client): return XEP_0106_handler() def escape(self, text) -> str: """Escape text @param text(unicode): text to escape @return (unicode): escaped text @raise ValueError: text can't be escaped """ if not text or text[0] == " " or text[-1] == " ": raise ValueError("text must not be empty, or start or end with a whitespace") escaped = [] for c in text: if c in ESCAPE_MAP: escaped.append(ESCAPE_MAP[c]) else: escaped.append(c) return "".join(escaped) def unescape(self, escaped) -> str: """Unescape text @param escaped(unicode): text to unescape @return (unicode): unescaped text @raise ValueError: text can't be unescaped """ if not escaped or escaped.startswith(r"\27") or escaped.endswith(r"\27"): raise ValueError( "escaped value must not be empty, or start or end with a " f"whitespace: rejected value is {escaped!r}" ) unescaped = [] idx = 0 while idx < len(escaped): char_seq = escaped[idx : idx + 3] if char_seq in self.reverse_map: unescaped.append(self.reverse_map[char_seq]) idx += 3 else: unescaped.append(escaped[idx]) idx += 1 return "".join(unescaped) @implementer(disco.IDisco) class XEP_0106_handler(xmlstream.XMPPHandler): def getDiscoInfo(self, requestor, target, nodeIdentifier=""): return [disco.DiscoFeature(NS_JID_ESCAPING)] def getDiscoItems(self, requestor, target, nodeIdentifier=""): return []