annotate libervia/backend/plugins/plugin_xep_0280.py @ 4231:e11b13418ba6

plugin XEP-0353, XEP-0234, jingle: WebRTC data channel signaling implementation: Implement XEP-0343: Signaling WebRTC Data Channels in Jingle. The current version of the XEP (0.3.1) has no implementation and contains some flaws. After discussing this on xsf@, Daniel (from Conversations) mentioned that they had a sprint with Larma (from Dino) to work on another version and provided me with this link: https://gist.github.com/iNPUTmice/6c56f3e948cca517c5fb129016d99e74 . I have used it for my implementation. This implementation reuses work done on Jingle A/V call (notably XEP-0176 and XEP-0167 plugins), with adaptations. When used, XEP-0234 will not handle the file itself as it normally does. This is because WebRTC has several implementations (browser for web interface, GStreamer for others), and file/data must be handled directly by the frontend. This is particularly important for web frontends, as the file is not sent from the backend but from the end-user's browser device. Among the changes, there are: - XEP-0343 implementation. - `file_send` bridge method now use serialised dict as output. - New `BaseTransportHandler.is_usable` method which get content data and returns a boolean (default to `True`) to tell if this transport can actually be used in this context (when we are initiator). Used in webRTC case to see if call data are available. - Support of `application` media type, and everything necessary to handle data channels. - Better confirmation message, with file name, size and description when available. - When file is accepted in preflight, it is specified in following `action_new` signal for actual file transfer. This way, frontend can avoid the display or 2 confirmation messages. - XEP-0166: when not specified, default `content` name is now its index number instead of a UUID. This follows the behaviour of browsers. - XEP-0353: better handling of events such as call taken by another device. - various other updates. rel 441
author Goffi <goffi@goffi.org>
date Sat, 06 Apr 2024 12:57:23 +0200
parents 9162d3480b9e
children 0d7bb4df2343
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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 managing xep-0280
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5 # Copyright (C) 2009-2021 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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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 libervia.backend.core.i18n import _, D_
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21 from libervia.backend.core.log import getLogger
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22
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23 log = getLogger(__name__)
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24 from libervia.backend.core import exceptions
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25 from libervia.backend.core.constants import Const as C
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26 from twisted.words.protocols.jabber.error import StanzaError
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27 from twisted.internet import defer
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28 from wokkel import disco, iwokkel
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29 from zope.interface import implementer
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30
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31 try:
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32 from twisted.words.protocols.xmlstream import XMPPHandler
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33 except ImportError:
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34 from wokkel.subprotocols import XMPPHandler
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37 PARAM_CATEGORY = "Misc"
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38 PARAM_NAME = "carbon"
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39 PARAM_LABEL = D_("Message carbons")
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40 NS_CARBONS = "urn:xmpp:carbons:2"
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41
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42 PLUGIN_INFO = {
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43 C.PI_NAME: "XEP-0280 Plugin",
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44 C.PI_IMPORT_NAME: "XEP-0280",
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45 C.PI_TYPE: "XEP",
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46 C.PI_PROTOCOLS: ["XEP-0280"],
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47 C.PI_DEPENDENCIES: [],
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48 C.PI_MAIN: "XEP_0280",
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49 C.PI_HANDLER: "yes",
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50 C.PI_DESCRIPTION: D_("""Implementation of Message Carbons"""),
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51 }
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53
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54 class XEP_0280(object):
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55 #  TODO: param is only checked at profile connection
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56 # activate carbons on param change even after profile connection
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57 # TODO: chat state notifications are not handled yet (and potentially other XEPs?)
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58
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59 params = """
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60 <params>
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61 <individual>
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62 <category name="{category_name}" label="{category_label}">
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63 <param name="{param_name}" label="{param_label}" value="true" type="bool" security="0" />
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64 </category>
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65 </individual>
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66 </params>
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67 """.format(
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68 category_name=PARAM_CATEGORY,
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69 category_label=D_(PARAM_CATEGORY),
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70 param_name=PARAM_NAME,
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71 param_label=PARAM_LABEL,
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72 )
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74 def __init__(self, host):
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75 log.info(_("Plugin XEP_0280 initialization"))
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76 self.host = host
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77 host.memory.update_params(self.params)
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78 host.trigger.add("message_received", self.message_received_trigger, priority=200000)
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79
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80 def get_handler(self, client):
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81 return XEP_0280_handler()
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82
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83 def set_private(self, message_elt):
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84 """Add a <private/> element to a message
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85
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86 this method is intented to be called on final domish.Element by other plugins
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87 (in particular end 2 end encryption plugins)
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88 @param message_elt(domish.Element): <message> stanza
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89 """
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90 if message_elt.name != "message":
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91 log.error("addPrivateElt must be used with <message> stanzas")
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92 return
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93 message_elt.addElement((NS_CARBONS, "private"))
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94
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95 @defer.inlineCallbacks
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96 def profile_connected(self, client):
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97 """activate message carbons on connection if possible and activated in config"""
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98 activate = self.host.memory.param_get_a(
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99 PARAM_NAME, PARAM_CATEGORY, profile_key=client.profile
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100 )
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101 if not activate:
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102 log.info(_("Not activating message carbons as requested in params"))
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103 return
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104 try:
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105 yield self.host.check_features(client, (NS_CARBONS,))
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106 except exceptions.FeatureNotFound:
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107 log.warning(_("server doesn't handle message carbons"))
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108 else:
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109 log.info(_("message carbons available, enabling it"))
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110 iq_elt = client.IQ()
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111 iq_elt.addElement((NS_CARBONS, "enable"))
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112 try:
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113 yield iq_elt.send()
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114 except StanzaError as e:
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115 log.warning("Can't activate message carbons: {}".format(e))
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116 else:
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117 log.info(_("message carbons activated"))
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118
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119 def message_received_trigger(self, client, message_elt, post_treat):
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120 """get message and handle it if carbons namespace is present"""
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121 for e in message_elt.elements():
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122 if e.uri == NS_CARBONS and e.name in ("received", "sent"):
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123 carbons_elt = e
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124 break
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125 else:
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126 # this is not a message carbons,
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127 # we continue normal behaviour
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128 return True
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129
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130 if message_elt["from"] != client.jid.userhost():
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131 log.warning(
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132 "The message carbon received is not from our server, hack attempt?\n{xml}".format(
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133 xml=message_elt.toXml()
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134 )
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135 )
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136 return
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137 forwarded_elt = next(carbons_elt.elements(C.NS_FORWARD, "forwarded"))
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138 cc_message_elt = next(forwarded_elt.elements(C.NS_CLIENT, "message"))
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139
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140 # we replace the wrapping message with the CCed one
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141 # and continue the normal behaviour
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142 message_elt["type"] = cc_message_elt.getAttribute("type", C.MESS_TYPE_NORMAL)
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143 mess_id = cc_message_elt.getAttribute("id")
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144 if mess_id:
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145 message_elt[mess_id] = mess_id
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146 if carbons_elt.name == "received":
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147 message_elt["from"] = cc_message_elt["from"]
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148 lang = cc_message_elt.getAttribute("xml:lang")
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149 if lang:
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150 message_elt["xml:lang"] = lang
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151 elif carbons_elt.name == "sent":
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152 # the cc_message_elt is the full JID, so we copy it
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153 message_elt["from"] = cc_message_elt["from"]
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154 try:
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155 message_elt["to"] = cc_message_elt["to"]
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156 except KeyError:
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157 # we may not have "to" in case of message from ourself (from an other
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158 # device)
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159 pass
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160 else:
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161 log.warning(
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162 "invalid message carbons received:\n{xml}".format(
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163 xml=message_elt.toXml()
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164 )
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165 )
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166 return False
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167
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168 del message_elt.children[:]
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169 for c in cc_message_elt.children:
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170 message_elt.addChild(c)
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171
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172 return True
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173
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174 @implementer(iwokkel.IDisco)
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175 class XEP_0280_handler(XMPPHandler):
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176
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177 def getDiscoInfo(self, requestor, target, nodeIdentifier=""):
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178 return [disco.DiscoFeature(NS_CARBONS)]
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179
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180 def getDiscoItems(self, requestor, target, nodeIdentifier=""):
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181 return []