Mercurial > libervia-backend
annotate sat/plugins/plugin_xep_0071.py @ 4035:9c76678a39e2
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| author | Goffi <goffi@goffi.org> |
|---|---|
| date | Fri, 07 Apr 2023 15:18:05 +0200 |
| parents | be6d91572633 |
| children | 524856bd7b19 |
| rev | line source |
|---|---|
| 3028 | 1 #!/usr/bin/env python3 |
| 3137 | 2 |
| 668 | 3 |
| 4 # SAT plugin for Publish-Subscribe (xep-0071) | |
| 3479 | 5 # Copyright (C) 2009-2021 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 ) |
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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 |
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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 [] |