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annotate sat/plugins/plugin_xep_0106.py @ 3248:5d67502bdc8c

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core (exceptions): new MissingPlugin exception: it is used when a feature needs an inactive or unavailable plugin.
author Goffi <goffi@goffi.org>
date Fri, 03 Apr 2020 18:02:27 +0200
parents 559a625a236b
children 66c4fc1f7c30
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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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16
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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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54
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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 []