Mercurial > libervia-backend
annotate sat/plugins/plugin_xep_0071.py @ 3162:b5c058c7692e
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> |
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date | Sun, 09 Feb 2020 23:56:42 +0100 |
parents | 559a625a236b |
children | dcebc585c29f |
rev | line source |
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3028 | 1 #!/usr/bin/env python3 |
3137 | 2 |
668 | 3 |
4 # SAT plugin for Publish-Subscribe (xep-0071) | |
3136 | 5 # Copyright (C) 2009-2020 Jérôme Poisson (goffi@goffi.org) |
668 | 6 |
7 # This program is free software: you can redistribute it and/or modify | |
8 # it under the terms of the GNU Affero General Public License as published by | |
9 # the Free Software Foundation, either version 3 of the License, or | |
10 # (at your option) any later version. | |
11 | |
12 # This program is distributed in the hope that it will be useful, | |
13 # but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 # GNU Affero General Public License for more details. | |
16 | |
17 # You should have received a copy of the GNU Affero General Public License | |
18 # along with this program. If not, see <http://www.gnu.org/licenses/>. | |
19 | |
771 | 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 import exceptions |
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23 from sat.core.log import getLogger |
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24 |
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25 log = getLogger(__name__) |
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26 from sat.tools.common import data_format |
668 | 27 |
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28 from twisted.internet import defer |
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29 from wokkel import disco, iwokkel |
3028 | 30 from zope.interface import implementer |
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31 |
668 | 32 # from lxml import etree |
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33 try: |
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34 from lxml import html |
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35 except ImportError: |
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36 raise exceptions.MissingModule( |
3028 | 37 "Missing module lxml, please download/install it from http://lxml.de/" |
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38 ) |
668 | 39 try: |
40 from twisted.words.protocols.xmlstream import XMPPHandler | |
41 except ImportError: | |
42 from wokkel.subprotocols import XMPPHandler | |
43 | |
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44 NS_XHTML_IM = "http://jabber.org/protocol/xhtml-im" |
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45 NS_XHTML = "http://www.w3.org/1999/xhtml" |
668 | 46 |
47 PLUGIN_INFO = { | |
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48 C.PI_NAME: "XHTML-IM Plugin", |
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49 C.PI_IMPORT_NAME: "XEP-0071", |
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50 C.PI_TYPE: "XEP", |
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51 C.PI_PROTOCOLS: ["XEP-0071"], |
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52 C.PI_DEPENDENCIES: ["TEXT_SYNTAXES"], |
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53 C.PI_MAIN: "XEP_0071", |
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54 C.PI_HANDLER: "yes", |
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55 C.PI_DESCRIPTION: _("""Implementation of XHTML-IM"""), |
668 | 56 } |
57 | |
58 allowed = { | |
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59 "a": set(["href", "style", "type"]), |
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60 "blockquote": set(["style"]), |
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61 "body": set(["style"]), |
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62 "br": set([]), |
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63 "cite": set(["style"]), |
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64 "em": set([]), |
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65 "img": set(["alt", "height", "src", "style", "width"]), |
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66 "li": set(["style"]), |
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67 "ol": set(["style"]), |
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68 "p": set(["style"]), |
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69 "span": set(["style"]), |
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70 "strong": set([]), |
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71 "ul": set(["style"]), |
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72 } |
668 | 73 |
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74 styles_allowed = [ |
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75 "background-color", |
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76 "color", |
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77 "font-family", |
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78 "font-size", |
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79 "font-style", |
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80 "font-weight", |
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81 "margin-left", |
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82 "margin-right", |
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83 "text-align", |
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84 "text-decoration", |
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85 ] |
668 | 86 |
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87 blacklist = ["script"] # tag that we have to kill (we don't keep content) |
668 | 88 |
89 | |
90 class XEP_0071(object): | |
91 SYNTAX_XHTML_IM = "XHTML-IM" | |
92 | |
93 def __init__(self, host): | |
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94 log.info(_("XHTML-IM plugin initialization")) |
668 | 95 self.host = host |
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96 self._s = self.host.plugins["TEXT_SYNTAXES"] |
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97 self._s.addSyntax( |
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98 self.SYNTAX_XHTML_IM, |
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99 lambda xhtml: xhtml, |
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100 self.XHTML2XHTML_IM, |
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101 [self._s.OPT_HIDDEN], |
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102 ) |
668 | 103 host.trigger.add("MessageReceived", self.messageReceivedTrigger) |
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104 host.trigger.add("sendMessage", self.sendMessageTrigger) |
668 | 105 |
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106 def getHandler(self, client): |
668 | 107 return XEP_0071_handler(self) |
108 | |
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109 def _messagePostTreat(self, data, message_elt, body_elts, client): |
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110 """Callback which manage the post treatment of the message in case of XHTML-IM found |
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111 |
668 | 112 @param data: data send by MessageReceived trigger through post_treat deferred |
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113 @param message_elt: whole <message> stanza |
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114 @param body_elts: XHTML-IM body elements found |
668 | 115 @return: the data with the extra parameter updated |
116 """ | |
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117 # TODO: check if text only body is empty, then try to convert XHTML-IM to pure text and show a warning message |
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118 def converted(xhtml, lang): |
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119 if lang: |
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120 data["extra"]["xhtml_{}".format(lang)] = xhtml |
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121 else: |
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122 data["extra"]["xhtml"] = xhtml |
668 | 123 |
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124 defers = [] |
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125 for body_elt in body_elts: |
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126 lang = body_elt.getAttribute((C.NS_XML, "lang"), "") |
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127 treat_d = defer.succeed(None) # deferred used for treatments |
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128 if self.host.trigger.point( |
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129 "xhtml_post_treat", client, message_elt, body_elt, lang, treat_d |
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130 ): |
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131 continue |
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132 treat_d.addCallback( |
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133 lambda __: self._s.convert( |
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134 body_elt.toXml(), self.SYNTAX_XHTML_IM, safe=True |
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135 ) |
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136 ) |
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137 treat_d.addCallback(converted, lang) |
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138 defers.append(treat_d) |
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139 |
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140 d_list = defer.DeferredList(defers) |
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141 d_list.addCallback(lambda __: data) |
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142 return d_list |
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143 |
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144 def _fill_body_text(self, text, data, lang): |
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145 data["message"][lang or ""] = text |
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146 message_elt = data["xml"] |
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147 body_elt = message_elt.addElement("body", content=text) |
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148 if lang: |
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149 body_elt[(C.NS_XML, "lang")] = lang |
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150 |
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151 def _check_body_text(self, data, lang, markup, syntax, defers): |
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152 """check if simple text message exists, and fill if needed""" |
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153 if not (lang or "") in data["message"]: |
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154 d = self._s.convert(markup, syntax, self._s.SYNTAX_TEXT) |
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155 d.addCallback(self._fill_body_text, data, lang) |
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156 defers.append(d) |
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157 |
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158 def _sendMessageAddRich(self, data, client): |
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159 """ Construct XHTML-IM node and add it XML element |
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160 |
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161 @param data: message data as sended by sendMessage callback |
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162 """ |
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163 # at this point, either ['extra']['rich'] or ['extra']['xhtml'] exists |
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164 # but both can't exist at the same time |
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165 message_elt = data["xml"] |
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166 html_elt = message_elt.addElement((NS_XHTML_IM, "html")) |
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167 |
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168 def syntax_converted(xhtml_im, lang): |
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169 body_elt = html_elt.addElement((NS_XHTML, "body")) |
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170 if lang: |
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171 body_elt[(C.NS_XML, "lang")] = lang |
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172 data["extra"]["xhtml_{}".format(lang)] = xhtml_im |
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173 else: |
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174 data["extra"]["xhtml"] = xhtml_im |
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175 body_elt.addRawXml(xhtml_im) |
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176 |
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177 syntax = self._s.getCurrentSyntax(client.profile) |
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178 defers = [] |
3028 | 179 if "xhtml" in data["extra"]: |
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180 # we have directly XHTML |
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181 for lang, xhtml in data_format.getSubDict("xhtml", data["extra"]): |
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182 self._check_body_text(data, lang, xhtml, self._s.SYNTAX_XHTML, defers) |
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183 d = self._s.convert(xhtml, self._s.SYNTAX_XHTML, self.SYNTAX_XHTML_IM) |
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184 d.addCallback(syntax_converted, lang) |
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185 defers.append(d) |
3028 | 186 elif "rich" in data["extra"]: |
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187 # we have rich syntax to convert |
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188 for lang, rich_data in data_format.getSubDict("rich", data["extra"]): |
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189 self._check_body_text(data, lang, rich_data, syntax, defers) |
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190 d = self._s.convert(rich_data, syntax, self.SYNTAX_XHTML_IM) |
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191 d.addCallback(syntax_converted, lang) |
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192 defers.append(d) |
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193 else: |
3028 | 194 exceptions.InternalError("xhtml or rich should be present at this point") |
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195 d_list = defer.DeferredList(defers) |
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196 d_list.addCallback(lambda __: data) |
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197 return d_list |
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198 |
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199 def messageReceivedTrigger(self, client, message, post_treat): |
668 | 200 """ Check presence of XHTML-IM in message |
201 """ | |
202 try: | |
3028 | 203 html_elt = next(message.elements(NS_XHTML_IM, "html")) |
668 | 204 except StopIteration: |
205 # No XHTML-IM | |
206 pass | |
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207 else: |
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208 body_elts = html_elt.elements(NS_XHTML, "body") |
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209 post_treat.addCallback(self._messagePostTreat, message, body_elts, client) |
668 | 210 return True |
211 | |
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212 def sendMessageTrigger(self, client, data, pre_xml_treatments, post_xml_treatments): |
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213 """ Check presence of rich text in extra """ |
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214 rich = {} |
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215 xhtml = {} |
3028 | 216 for key, value in data["extra"].items(): |
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217 if key.startswith("rich"): |
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218 rich[key[5:]] = value |
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219 elif key.startswith("xhtml"): |
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220 xhtml[key[6:]] = value |
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221 if rich and xhtml: |
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222 raise exceptions.DataError( |
3028 | 223 _("Can't have XHTML and rich content at the same time") |
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224 ) |
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225 if rich or xhtml: |
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226 if rich: |
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227 data["rich"] = rich |
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228 else: |
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229 data["xhtml"] = xhtml |
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230 post_xml_treatments.addCallback(self._sendMessageAddRich, client) |
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231 return True |
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232 |
668 | 233 def _purgeStyle(self, styles_raw): |
234 """ Remove unauthorised styles according to the XEP-0071 | |
235 @param styles_raw: raw styles (value of the style attribute) | |
236 """ | |
237 purged = [] | |
238 | |
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239 styles = [style.strip().split(":") for style in styles_raw.split(";")] |
668 | 240 |
241 for style_tuple in styles: | |
242 if len(style_tuple) != 2: | |
243 continue | |
244 name, value = style_tuple | |
245 name = name.strip() | |
246 if name not in styles_allowed: | |
247 continue | |
248 purged.append((name, value.strip())) | |
249 | |
3028 | 250 return "; ".join(["%s: %s" % data for data in purged]) |
668 | 251 |
252 def XHTML2XHTML_IM(self, xhtml): | |
253 """ Convert XHTML document to XHTML_IM subset | |
254 @param xhtml: raw xhtml to convert | |
255 """ | |
256 # TODO: more clever tag replacement (replace forbidden tags with equivalents when possible) | |
257 | |
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258 parser = html.HTMLParser(remove_comments=True, encoding="utf-8") |
668 | 259 root = html.fromstring(xhtml, parser=parser) |
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260 body_elt = root.find("body") |
668 | 261 if body_elt is None: |
262 # we use the whole XML as body if no body element is found | |
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263 body_elt = html.Element("body") |
668 | 264 body_elt.append(root) |
265 else: | |
266 body_elt.attrib.clear() | |
267 | |
3028 | 268 allowed_tags = list(allowed.keys()) |
668 | 269 to_strip = [] |
270 for elem in body_elt.iter(): | |
271 if elem.tag not in allowed_tags: | |
272 to_strip.append(elem) | |
273 else: | |
274 # we remove unallowed attributes | |
275 attrib = elem.attrib | |
276 att_to_remove = set(attrib).difference(allowed[elem.tag]) | |
277 for att in att_to_remove: | |
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278 del (attrib[att]) |
668 | 279 if "style" in attrib: |
280 attrib["style"] = self._purgeStyle(attrib["style"]) | |
281 | |
282 for elem in to_strip: | |
283 if elem.tag in blacklist: | |
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284 # we need to remove the element and all descendants |
3028 | 285 log.debug("removing black listed tag: %s" % (elem.tag)) |
668 | 286 elem.drop_tree() |
287 else: | |
288 elem.drop_tag() | |
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289 if len(body_elt) != 1: |
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290 root_elt = body_elt |
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291 body_elt.tag = "p" |
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292 else: |
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293 root_elt = body_elt[0] |
668 | 294 |
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295 return html.tostring(root_elt, encoding="unicode", method="xml") |
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296 |
668 | 297 |
3028 | 298 @implementer(iwokkel.IDisco) |
668 | 299 class XEP_0071_handler(XMPPHandler): |
300 | |
301 def __init__(self, plugin_parent): | |
302 self.plugin_parent = plugin_parent | |
303 self.host = plugin_parent.host | |
304 | |
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305 def getDiscoInfo(self, requestor, target, nodeIdentifier=""): |
668 | 306 return [disco.DiscoFeature(NS_XHTML_IM)] |
307 | |
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308 def getDiscoItems(self, requestor, target, nodeIdentifier=""): |
668 | 309 return [] |