Mercurial > libervia-backend
annotate src/plugins/plugin_xep_0071.py @ 2325:760df3a58c24
jp (blog/edit): syntax modifications:
- adapted to new behaviour (keys which are names in lower case en stripped are now used)
- added --syntax so force a specific syntax. If not used, profile's default syntax will be used
| author | Goffi <goffi@goffi.org> |
|---|---|
| date | Thu, 13 Jul 2017 20:55:35 +0200 |
| parents | 33c8c4973743 |
| children | 8b37a62336c3 |
| rev | line source |
|---|---|
|
1934
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use of /usr/bin/env instead of /usr/bin/python in shebang
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1 #!/usr/bin/env python2 |
| 668 | 2 # -*- coding: utf-8 -*- |
| 3 | |
| 4 # SAT plugin for Publish-Subscribe (xep-0071) | |
| 1766 | 5 # Copyright (C) 2009-2016 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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plugin groupblog, XEP-0071, XEP-0277, text_syntaxes: manage raw/rich/xhtml data for content/title:
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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 log = getLogger(__name__) |
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25 from sat.tools.common import data_format |
| 668 | 26 |
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27 from twisted.internet import defer |
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28 from wokkel import disco, iwokkel |
| 668 | 29 from zope.interface import implements |
| 30 # from lxml import etree | |
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31 try: |
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32 from lxml import html |
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33 except ImportError: |
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34 raise exceptions.MissingModule(u"Missing module lxml, please download/install it from http://lxml.de/") |
| 668 | 35 try: |
| 36 from twisted.words.protocols.xmlstream import XMPPHandler | |
| 37 except ImportError: | |
| 38 from wokkel.subprotocols import XMPPHandler | |
| 39 | |
| 40 NS_XHTML_IM = 'http://jabber.org/protocol/xhtml-im' | |
| 41 NS_XHTML = 'http://www.w3.org/1999/xhtml' | |
| 42 | |
| 43 PLUGIN_INFO = { | |
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44 C.PI_NAME: "XHTML-IM Plugin", |
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45 C.PI_IMPORT_NAME: "XEP-0071", |
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46 C.PI_TYPE: "XEP", |
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47 C.PI_PROTOCOLS: ["XEP-0071"], |
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48 C.PI_DEPENDENCIES: ["TEXT-SYNTAXES"], |
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49 C.PI_MAIN: "XEP_0071", |
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50 C.PI_HANDLER: "yes", |
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51 C.PI_DESCRIPTION: _("""Implementation of XHTML-IM""") |
| 668 | 52 } |
| 53 | |
| 54 allowed = { | |
| 55 "a": set(["href", "style", "type"]), | |
| 56 "blockquote": set(["style"]), | |
| 57 "body": set(["style"]), | |
| 58 "br": set([]), | |
| 59 "cite": set(["style"]), | |
| 60 "em": set([]), | |
| 61 "img": set(["alt", "height", "src", "style", "width"]), | |
| 62 "li": set(["style"]), | |
| 63 "ol": set(["style"]), | |
| 64 "p": set(["style"]), | |
| 65 "span": set(["style"]), | |
| 66 "strong": set([]), | |
| 67 "ul": set(["style"]), | |
| 68 } | |
| 69 | |
| 70 styles_allowed = ["background-color", "color", "font-family", "font-size", "font-style", "font-weight", "margin-left", "margin-right", "text-align", "text-decoration"] | |
| 71 | |
| 72 blacklist = ['script'] # tag that we have to kill (we don't keep content) | |
| 73 | |
| 74 | |
| 75 class XEP_0071(object): | |
| 76 SYNTAX_XHTML_IM = "XHTML-IM" | |
| 77 | |
| 78 def __init__(self, host): | |
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79 log.info(_("XHTML-IM plugin initialization")) |
| 668 | 80 self.host = host |
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81 self._s = self.host.plugins["TEXT-SYNTAXES"] |
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82 self._s.addSyntax(self.SYNTAX_XHTML_IM, lambda xhtml: xhtml, self.XHTML2XHTML_IM, [self._s.OPT_HIDDEN]) |
| 668 | 83 host.trigger.add("MessageReceived", self.messageReceivedTrigger) |
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84 host.trigger.add("sendMessage", self.sendMessageTrigger) |
| 668 | 85 |
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86 def getHandler(self, client): |
| 668 | 87 return XEP_0071_handler(self) |
| 88 | |
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89 def _messagePostTreat(self, data, message_elt, body_elts, client): |
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90 """Callback which manage the post treatment of the message in case of XHTML-IM found |
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91 |
| 668 | 92 @param data: data send by MessageReceived trigger through post_treat deferred |
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93 @param message_elt: whole <message> stanza |
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94 @param body_elts: XHTML-IM body elements found |
| 668 | 95 @return: the data with the extra parameter updated |
| 96 """ | |
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97 # 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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98 def converted(xhtml, lang): |
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99 if lang: |
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100 data['extra']['xhtml_{}'.format(lang)] = xhtml |
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101 else: |
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102 data['extra']['xhtml'] = xhtml |
| 668 | 103 |
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104 defers = [] |
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105 for body_elt in body_elts: |
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106 lang = body_elt.getAttribute((C.NS_XML, 'lang'), '') |
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107 treat_d = defer.succeed(None) # deferred used for treatments |
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108 if self.host.trigger.point("xhtml_post_treat", client, message_elt, body_elt, lang, treat_d): |
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109 continue |
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110 treat_d.addCallback(lambda dummy: self._s.convert(body_elt.toXml(), self.SYNTAX_XHTML_IM, safe=True)) |
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111 treat_d.addCallback(converted, lang) |
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112 defers.append(treat_d) |
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113 |
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114 d_list = defer.DeferredList(defers) |
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115 d_list.addCallback(lambda dummy: data) |
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116 return d_list |
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117 |
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118 def _fill_body_text(self, text, data, lang): |
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119 data['message'][lang or ''] = text |
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120 message_elt = data['xml'] |
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121 body_elt = message_elt.addElement("body", content=text) |
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122 if lang: |
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123 body_elt[(C.NS_XML, 'lang')] = lang |
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124 |
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125 def _check_body_text(self, data, lang, markup, syntax, defers): |
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126 """check if simple text message exists, and fill if needed""" |
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127 if not (lang or '') in data['message']: |
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128 d = self._s.convert(markup, syntax, self._s.SYNTAX_TEXT) |
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129 d.addCallback(self._fill_body_text, data, lang) |
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130 defers.append(d) |
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131 |
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132 def _sendMessageAddRich(self, data, client): |
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133 """ Construct XHTML-IM node and add it XML element |
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134 |
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135 @param data: message data as sended by sendMessage callback |
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136 """ |
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137 # at this point, either ['extra']['rich'] or ['extra']['xhtml'] exists |
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138 # but both can't exist at the same time |
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139 message_elt = data['xml'] |
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140 html_elt = message_elt.addElement((NS_XHTML_IM, 'html')) |
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141 |
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142 def syntax_converted(xhtml_im, lang): |
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143 body_elt = html_elt.addElement((NS_XHTML, 'body')) |
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144 if lang: |
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145 body_elt[(C.NS_XML, 'lang')] = lang |
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146 data['extra']['xhtml_{}'.format(lang)] = xhtml_im |
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147 else: |
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148 data['extra']['xhtml'] = xhtml_im |
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149 body_elt.addRawXml(xhtml_im) |
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150 |
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151 syntax = self._s.getCurrentSyntax(client.profile) |
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152 defers = [] |
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153 if u'xhtml' in data['extra']: |
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154 # we have directly XHTML |
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155 for lang, xhtml in data_format.getSubDict('xhtml', data['extra']): |
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156 self._check_body_text(data, lang, xhtml, self._s.SYNTAX_XHTML, defers) |
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157 d = self._s.convert(xhtml, self._s.SYNTAX_XHTML, self.SYNTAX_XHTML_IM) |
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158 d.addCallback(syntax_converted, lang) |
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159 defers.append(d) |
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160 elif u'rich' in data['extra']: |
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161 # we have rich syntax to convert |
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162 for lang, rich_data in data_format.getSubDict('rich', data['extra']): |
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163 self._check_body_text(data, lang, rich_data, syntax, defers) |
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164 d = self._s.convert(rich_data, syntax, self.SYNTAX_XHTML_IM) |
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165 d.addCallback(syntax_converted, lang) |
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166 defers.append(d) |
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167 else: |
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168 exceptions.InternalError(u"xhtml or rich should be present at this point") |
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169 d_list = defer.DeferredList(defers) |
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170 d_list.addCallback(lambda dummy: data) |
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171 return d_list |
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172 |
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173 def messageReceivedTrigger(self, client, message, post_treat): |
| 668 | 174 """ Check presence of XHTML-IM in message |
| 175 """ | |
| 176 try: | |
| 177 html_elt = message.elements(NS_XHTML_IM, 'html').next() | |
| 178 except StopIteration: | |
| 179 # No XHTML-IM | |
| 180 pass | |
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181 else: |
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182 body_elts = html_elt.elements(NS_XHTML, 'body') |
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183 post_treat.addCallback(self._messagePostTreat, message, body_elts, client) |
| 668 | 184 return True |
| 185 | |
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186 def sendMessageTrigger(self, client, data, pre_xml_treatments, post_xml_treatments): |
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187 """ Check presence of rich text in extra """ |
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188 rich = {} |
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189 xhtml = {} |
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190 for key, value in data['extra'].iteritems(): |
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191 if key.startswith('rich'): |
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192 rich[key[5:]] = value |
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193 elif key.startswith('xhtml'): |
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194 xhtml[key[6:]] = value |
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195 if rich and xhtml: |
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196 raise exceptions.DataError(_(u"Can't have XHTML and rich content at the same time")) |
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197 if rich or xhtml: |
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198 if rich: |
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199 data['rich'] = rich |
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200 else: |
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201 data['xhtml'] = xhtml |
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202 post_xml_treatments.addCallback(self._sendMessageAddRich, client) |
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203 return True |
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204 |
| 668 | 205 def _purgeStyle(self, styles_raw): |
| 206 """ Remove unauthorised styles according to the XEP-0071 | |
| 207 @param styles_raw: raw styles (value of the style attribute) | |
| 208 """ | |
| 209 purged = [] | |
| 210 | |
| 211 styles = [style.strip().split(':') for style in styles_raw.split(';')] | |
| 212 | |
| 213 for style_tuple in styles: | |
| 214 if len(style_tuple) != 2: | |
| 215 continue | |
| 216 name, value = style_tuple | |
| 217 name = name.strip() | |
| 218 if name not in styles_allowed: | |
| 219 continue | |
| 220 purged.append((name, value.strip())) | |
| 221 | |
| 222 return u'; '.join([u"%s: %s" % data for data in purged]) | |
| 223 | |
| 224 def XHTML2XHTML_IM(self, xhtml): | |
| 225 """ Convert XHTML document to XHTML_IM subset | |
| 226 @param xhtml: raw xhtml to convert | |
| 227 """ | |
| 228 # TODO: more clever tag replacement (replace forbidden tags with equivalents when possible) | |
| 229 | |
| 230 parser = html.HTMLParser(remove_comments=True, encoding='utf-8') | |
| 231 root = html.fromstring(xhtml, parser=parser) | |
| 232 body_elt = root.find('body') | |
| 233 if body_elt is None: | |
| 234 # we use the whole XML as body if no body element is found | |
| 235 body_elt = html.Element('body') | |
| 236 body_elt.append(root) | |
| 237 else: | |
| 238 body_elt.attrib.clear() | |
| 239 | |
| 240 allowed_tags = allowed.keys() | |
| 241 to_strip = [] | |
| 242 for elem in body_elt.iter(): | |
| 243 if elem.tag not in allowed_tags: | |
| 244 to_strip.append(elem) | |
| 245 else: | |
| 246 # we remove unallowed attributes | |
| 247 attrib = elem.attrib | |
| 248 att_to_remove = set(attrib).difference(allowed[elem.tag]) | |
| 249 for att in att_to_remove: | |
| 250 del(attrib[att]) | |
| 251 if "style" in attrib: | |
| 252 attrib["style"] = self._purgeStyle(attrib["style"]) | |
| 253 | |
| 254 for elem in to_strip: | |
| 255 if elem.tag in blacklist: | |
| 256 #we need to remove the element and all descendants | |
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257 log.debug(u"removing black listed tag: %s" % (elem.tag)) |
| 668 | 258 elem.drop_tree() |
| 259 else: | |
| 260 elem.drop_tag() | |
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261 if len(body_elt) !=1: |
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262 root_elt = body_elt |
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263 body_elt.tag = "p" |
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264 else: |
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265 root_elt = body_elt[0] |
| 668 | 266 |
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267 return html.tostring(root_elt, encoding='unicode', method='xml') |
| 668 | 268 |
| 269 class XEP_0071_handler(XMPPHandler): | |
| 270 implements(iwokkel.IDisco) | |
| 271 | |
| 272 def __init__(self, plugin_parent): | |
| 273 self.plugin_parent = plugin_parent | |
| 274 self.host = plugin_parent.host | |
| 275 | |
| 276 def getDiscoInfo(self, requestor, target, nodeIdentifier=''): | |
| 277 return [disco.DiscoFeature(NS_XHTML_IM)] | |
| 278 | |
| 279 def getDiscoItems(self, requestor, target, nodeIdentifier=''): | |
| 280 return [] |