111 lines
3.4 KiB
Python
111 lines
3.4 KiB
Python
#!/usr/bin/env python3
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# SAT plugin for Explicit Message Encryption
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# Copyright (C) 2009-2020 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 sat.core.i18n import _
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from sat.core.constants import Const as C
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from sat.core.log import getLogger
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from twisted.words.protocols.jabber import xmlstream
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from zope.interface import implementer
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from wokkel import disco
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log = getLogger(__name__)
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PLUGIN_INFO = {
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C.PI_NAME: "JID Escaping",
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C.PI_IMPORT_NAME: "XEP-0106",
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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-0106"],
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C.PI_DEPENDENCIES: [],
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C.PI_MAIN: "XEP_0106",
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C.PI_HANDLER: "yes",
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C.PI_DESCRIPTION: _("""(Un)escape JID to use disallowed chars in local parts"""),
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}
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NS_JID_ESCAPING = r"jid\20escaping"
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ESCAPE_MAP = {
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' ': r'\20',
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'"': r'\22',
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'&': r'\26',
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"'": r'\27',
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'/': r'\2f',
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':': r'\3a',
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'<': r'\3c',
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'>': r'\3e',
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'@': r'\40',
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'\\': r'\5c',
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}
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class XEP_0106(object):
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def __init__(self, host):
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self.reverse_map = {v:k for k,v in ESCAPE_MAP.items()}
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def getHandler(self, client):
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return XEP_0106_handler()
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def escape(self, text):
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"""Escape text
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@param text(unicode): text to escape
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@return (unicode): escaped text
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@raise ValueError: text can't be escaped
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"""
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if not text or text[0] == ' ' or text[-1] == ' ':
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raise ValueError("text must not be empty, or start or end with a whitespace")
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escaped = []
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for c in text:
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if c in ESCAPE_MAP:
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escaped.append(ESCAPE_MAP[c])
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else:
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escaped.append(c)
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return ''.join(escaped)
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def unescape(self, escaped):
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"""Unescape text
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@param escaped(unicode): text to unescape
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@return (unicode): unescaped text
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@raise ValueError: text can't be unescaped
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"""
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if not escaped or escaped.startswith(r'\27') or escaped.endswith(r'\27'):
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raise ValueError("escaped value must not be empty, or start or end with a "
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f"whitespace: rejected value is {escaped!r}")
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unescaped = []
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idx = 0
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while idx < len(escaped):
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char_seq = escaped[idx:idx+3]
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if char_seq in self.reverse_map:
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unescaped.append(self.reverse_map[char_seq])
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idx += 3
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else:
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unescaped.append(escaped[idx])
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idx += 1
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return ''.join(unescaped)
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@implementer(disco.IDisco)
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class XEP_0106_handler(xmlstream.XMPPHandler):
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def getDiscoInfo(self, requestor, target, nodeIdentifier=""):
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return [disco.DiscoFeature(NS_JID_ESCAPING)]
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def getDiscoItems(self, requestor, target, nodeIdentifier=""):
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return []
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