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annotate sat/plugins/plugin_xep_0106.py @ 3162:b5c058c7692e

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core (xmpp), plugin android: fixed DNS, SRV handling on Android: Android doesn't have a "/etc/resolv.conf" that Twisted expect. As a result, SRV records can't be checked correctly on connection. To work around that, DNS servers used on Android are checked when necessary (on Android plugin startup and on connectivity change), using some hacks, and Twisted is patched to use them.
author Goffi <goffi@goffi.org>
date Sun, 09 Feb 2020 23:56:42 +0100
parents 559a625a236b
children 66c4fc1f7c30
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1 #!/usr/bin/env python3
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2
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3
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4 # SAT plugin for Explicit Message Encryption
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5 # Copyright (C) 2009-2020 Jérôme Poisson (goffi@goffi.org)
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6
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7 # This program is free software: you can redistribute it and/or modify
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8 # it under the terms of the GNU Affero General Public License as published by
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9 # the Free Software Foundation, either version 3 of the License, or
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10 # (at your option) any later version.
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11
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12 # This program is distributed in the hope that it will be useful,
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13 # but WITHOUT ANY WARRANTY; without even the implied warranty of
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14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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15 # GNU Affero General Public License for more details.
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17 # You should have received a copy of the GNU Affero General Public License
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18 # along with this program. If not, see <http://www.gnu.org/licenses/>.
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19
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20 from sat.core.i18n import _
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21 from sat.core.constants import Const as C
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22 from sat.core.log import getLogger
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23 from twisted.words.protocols.jabber import xmlstream
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24 from zope.interface import implementer
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25 from wokkel import disco
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26
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27 log = getLogger(__name__)
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28
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29 PLUGIN_INFO = {
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30 C.PI_NAME: "JID Escaping",
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31 C.PI_IMPORT_NAME: "XEP-0106",
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32 C.PI_TYPE: "XEP",
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33 C.PI_MODES: C.PLUG_MODE_BOTH,
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34 C.PI_PROTOCOLS: ["XEP-0106"],
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35 C.PI_DEPENDENCIES: [],
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36 C.PI_MAIN: "XEP_0106",
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37 C.PI_HANDLER: "yes",
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38 C.PI_DESCRIPTION: _("""(Un)escape JID to use disallowed chars in local parts"""),
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39 }
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40
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41 NS_JID_ESCAPING = r"jid\20escaping"
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42 ESCAPE_MAP = {
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43 ' ': r'\20',
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44 '"': r'\22',
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45 '&': r'\26',
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46 "'": r'\27',
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47 '/': r'\2f',
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48 ':': r'\3a',
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49 '<': r'\3c',
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50 '>': r'\3e',
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51 '@': r'\40',
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52 '\\': r'\5c',
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53 }
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55
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56 class XEP_0106(object):
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57
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58 def __init__(self, host):
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59 self.reverse_map = {v:k for k,v in ESCAPE_MAP.items()}
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60
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61 def getHandler(self, client):
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62 return XEP_0106_handler()
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63
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64 def escape(self, text):
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65 """Escape text
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66
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67 @param text(unicode): text to escape
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68 @return (unicode): escaped text
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69 @raise ValueError: text can't be escaped
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70 """
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71 if not text or text[0] == ' ' or text[-1] == ' ':
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72 raise ValueError("text must not be empty, or start or end with a whitespace")
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73 escaped = []
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74 for c in text:
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75 if c in ESCAPE_MAP:
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76 escaped.append(ESCAPE_MAP[c])
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77 else:
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78 escaped.append(c)
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79 return ''.join(escaped)
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80
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81 def unescape(self, escaped):
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82 """Unescape text
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83
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84 @param escaped(unicode): text to unescape
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85 @return (unicode): unescaped text
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86 @raise ValueError: text can't be unescaped
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87 """
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88 if not escaped or escaped.startswith(r'\27') or escaped.endswith(r'\27'):
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89 raise ValueError("escaped value must not be empty, or start or end with a "
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90 "whitespace")
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91 unescaped = []
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92 idx = 0
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93 while idx < len(escaped):
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94 char_seq = escaped[idx:idx+3]
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95 if char_seq in self.reverse_map:
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96 unescaped.append(self.reverse_map[char_seq])
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97 idx += 3
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98 else:
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99 unescaped.append(escaped[idx])
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100 idx += 1
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101 return ''.join(unescaped)
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102
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103
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104 @implementer(disco.IDisco)
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105 class XEP_0106_handler(xmlstream.XMPPHandler):
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106
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107 def getDiscoInfo(self, requestor, target, nodeIdentifier=""):
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108 return [disco.DiscoFeature(NS_JID_ESCAPING)]
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109
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110 def getDiscoItems(self, requestor, target, nodeIdentifier=""):
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111 return []