Mercurial > libervia-backend
annotate src/plugins/plugin_xep_0071.py @ 2005:2afd5bd781ef
plugin XEP-0070: implementation of XEP-0070 (verifying HTTP request via XMPP)
| author | Geoffrey POUZET <chteufleur@kingpenguin.tk> |
|---|---|
| date | Mon, 11 Jul 2016 20:01:05 +0200 |
| parents | a2bc5089c2eb |
| children | 3626b2813158 |
| rev | line source |
|---|---|
|
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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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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__) |
| 668 | 25 |
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26 from twisted.internet import defer |
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27 from wokkel import disco, iwokkel |
| 668 | 28 from zope.interface import implements |
| 29 # from lxml import etree | |
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30 try: |
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31 from lxml import html |
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32 except ImportError: |
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33 raise exceptions.MissingModule(u"Missing module lxml, please download/install it from http://lxml.de/") |
| 668 | 34 try: |
| 35 from twisted.words.protocols.xmlstream import XMPPHandler | |
| 36 except ImportError: | |
| 37 from wokkel.subprotocols import XMPPHandler | |
| 38 | |
| 39 NS_XHTML_IM = 'http://jabber.org/protocol/xhtml-im' | |
| 40 NS_XHTML = 'http://www.w3.org/1999/xhtml' | |
| 41 | |
| 42 PLUGIN_INFO = { | |
| 43 "name": "XHTML-IM Plugin", | |
| 44 "import_name": "XEP-0071", | |
| 45 "type": "XEP", | |
| 46 "protocols": ["XEP-0071"], | |
| 47 "dependencies": ["TEXT-SYNTAXES"], | |
| 48 "main": "XEP_0071", | |
| 49 "handler": "yes", | |
| 50 "description": _("""Implementation of XHTML-IM""") | |
| 51 } | |
| 52 | |
| 53 allowed = { | |
| 54 "a": set(["href", "style", "type"]), | |
| 55 "blockquote": set(["style"]), | |
| 56 "body": set(["style"]), | |
| 57 "br": set([]), | |
| 58 "cite": set(["style"]), | |
| 59 "em": set([]), | |
| 60 "img": set(["alt", "height", "src", "style", "width"]), | |
| 61 "li": set(["style"]), | |
| 62 "ol": set(["style"]), | |
| 63 "p": set(["style"]), | |
| 64 "span": set(["style"]), | |
| 65 "strong": set([]), | |
| 66 "ul": set(["style"]), | |
| 67 } | |
| 68 | |
| 69 styles_allowed = ["background-color", "color", "font-family", "font-size", "font-style", "font-weight", "margin-left", "margin-right", "text-align", "text-decoration"] | |
| 70 | |
| 71 blacklist = ['script'] # tag that we have to kill (we don't keep content) | |
| 72 | |
| 73 | |
| 74 class XEP_0071(object): | |
| 75 SYNTAX_XHTML_IM = "XHTML-IM" | |
| 76 | |
| 77 def __init__(self, host): | |
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78 log.info(_("XHTML-IM plugin initialization")) |
| 668 | 79 self.host = host |
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80 self._s = self.host.plugins["TEXT-SYNTAXES"] |
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81 self._s.addSyntax(self.SYNTAX_XHTML_IM, lambda xhtml: xhtml, self.XHTML2XHTML_IM, [self._s.OPT_HIDDEN]) |
| 668 | 82 host.trigger.add("MessageReceived", self.messageReceivedTrigger) |
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83 host.trigger.add("messageSend", self.messageSendTrigger) |
| 668 | 84 |
| 85 def getHandler(self, profile): | |
| 86 return XEP_0071_handler(self) | |
| 87 | |
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88 def _messagePostTreat(self, data, body_elts): |
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89 """Callback which manage the post treatment of the message in case of XHTML-IM found |
| 668 | 90 @param data: data send by MessageReceived trigger through post_treat deferred |
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91 @param body_elts: XHTML-IM body elements found |
| 668 | 92 @return: the data with the extra parameter updated |
| 93 """ | |
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94 # 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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95 def converted(xhtml, lang): |
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96 if lang: |
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97 data['extra']['xhtml_{}'.format(lang)] = xhtml |
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98 else: |
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99 data['extra']['xhtml'] = xhtml |
| 668 | 100 |
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101 defers = [] |
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102 for body_elt in body_elts: |
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103 lang = body_elt.getAttribute((C.NS_XML, 'lang'), '') |
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104 d = self._s.convert(body_elt.toXml(), self.SYNTAX_XHTML_IM, safe=True) |
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105 d.addCallback(converted, lang) |
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106 defers.append(d) |
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107 |
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108 d_list = defer.DeferredList(defers) |
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109 d_list.addCallback(lambda dummy: data) |
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110 return d_list |
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111 |
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112 def _messageSendAddRich(self, data, client): |
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113 """ Construct XHTML-IM node and add it XML element |
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114 |
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115 @param data: message data as sended by messageSend callback |
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116 """ |
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117 # at this point, either ['extra']['rich'] or ['extra']['xhtml'] exists |
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118 # but both can't exist at the same time |
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119 message_elt = data['xml'] |
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120 html_elt = message_elt.addElement((NS_XHTML_IM, 'html')) |
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121 |
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122 def syntax_converted(xhtml_im, lang): |
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123 body_elt = html_elt.addElement((NS_XHTML, 'body')) |
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124 if lang: |
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125 body_elt[(C.NS_XML, 'lang')] = lang |
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126 data['extra']['xhtml_{}'.format(lang)] = xhtml_im |
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127 else: |
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128 data['extra']['xhtml'] = xhtml_im |
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129 body_elt.addRawXml(xhtml_im) |
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130 |
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131 syntax = self._s.getCurrentSyntax(client.profile) |
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132 defers = [] |
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133 try: |
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134 rich = data['extra']['rich'] |
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135 except KeyError: |
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136 # we have directly XHTML |
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137 for lang, xhtml in data['extra']['xhtml'].iteritems(): |
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138 d = self._s.convert(xhtml, self._s.SYNTAX_XHTML, self.SYNTAX_XHTML_IM) |
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139 d.addCallback(syntax_converted, lang) |
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140 defers.append(d) |
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141 else: |
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142 # we have rich syntax to convert |
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143 for lang, rich_data in rich.iteritems(): |
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144 d = self._s.convert(rich_data, syntax, self.SYNTAX_XHTML_IM) |
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145 d.addCallback(syntax_converted, lang) |
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146 defers.append(d) |
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147 d_list = defer.DeferredList(defers) |
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148 d_list.addCallback(lambda dummy: data) |
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149 return d_list |
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150 |
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151 def messageReceivedTrigger(self, client, message, post_treat): |
| 668 | 152 """ Check presence of XHTML-IM in message |
| 153 """ | |
| 154 try: | |
| 155 html_elt = message.elements(NS_XHTML_IM, 'html').next() | |
| 156 except StopIteration: | |
| 157 # No XHTML-IM | |
| 158 pass | |
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159 else: |
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160 body_elts = html_elt.elements(NS_XHTML, 'body') |
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161 post_treat.addCallback(self._messagePostTreat, body_elts) |
| 668 | 162 return True |
| 163 | |
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164 def messageSendTrigger(self, client, data, pre_xml_treatments, post_xml_treatments): |
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165 """ Check presence of rich text in extra |
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166 """ |
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167 rich = {} |
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168 xhtml = {} |
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169 for key, value in data['extra'].iteritems(): |
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170 if key.startswith('rich'): |
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171 rich[key[5:]] = value |
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172 elif key.startswith('xhtml'): |
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173 xhtml[key[6:]] = value |
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174 if rich and xhtml: |
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175 raise exceptions.DataError(_(u"Can't have XHTML and rich content at the same time")) |
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176 if rich or xhtml: |
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177 if rich: |
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178 data['rich'] = rich |
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179 else: |
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180 data['xhtml'] = xhtml |
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181 post_xml_treatments.addCallback(self._messageSendAddRich, client) |
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182 return True |
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183 |
| 668 | 184 def _purgeStyle(self, styles_raw): |
| 185 """ Remove unauthorised styles according to the XEP-0071 | |
| 186 @param styles_raw: raw styles (value of the style attribute) | |
| 187 """ | |
| 188 purged = [] | |
| 189 | |
| 190 styles = [style.strip().split(':') for style in styles_raw.split(';')] | |
| 191 | |
| 192 for style_tuple in styles: | |
| 193 if len(style_tuple) != 2: | |
| 194 continue | |
| 195 name, value = style_tuple | |
| 196 name = name.strip() | |
| 197 if name not in styles_allowed: | |
| 198 continue | |
| 199 purged.append((name, value.strip())) | |
| 200 | |
| 201 return u'; '.join([u"%s: %s" % data for data in purged]) | |
| 202 | |
| 203 def XHTML2XHTML_IM(self, xhtml): | |
| 204 """ Convert XHTML document to XHTML_IM subset | |
| 205 @param xhtml: raw xhtml to convert | |
| 206 """ | |
| 207 # TODO: more clever tag replacement (replace forbidden tags with equivalents when possible) | |
| 208 | |
| 209 parser = html.HTMLParser(remove_comments=True, encoding='utf-8') | |
| 210 root = html.fromstring(xhtml, parser=parser) | |
| 211 body_elt = root.find('body') | |
| 212 if body_elt is None: | |
| 213 # we use the whole XML as body if no body element is found | |
| 214 body_elt = html.Element('body') | |
| 215 body_elt.append(root) | |
| 216 else: | |
| 217 body_elt.attrib.clear() | |
| 218 | |
| 219 allowed_tags = allowed.keys() | |
| 220 to_strip = [] | |
| 221 for elem in body_elt.iter(): | |
| 222 if elem.tag not in allowed_tags: | |
| 223 to_strip.append(elem) | |
| 224 else: | |
| 225 # we remove unallowed attributes | |
| 226 attrib = elem.attrib | |
| 227 att_to_remove = set(attrib).difference(allowed[elem.tag]) | |
| 228 for att in att_to_remove: | |
| 229 del(attrib[att]) | |
| 230 if "style" in attrib: | |
| 231 attrib["style"] = self._purgeStyle(attrib["style"]) | |
| 232 | |
| 233 for elem in to_strip: | |
| 234 if elem.tag in blacklist: | |
| 235 #we need to remove the element and all descendants | |
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236 log.debug(u"removing black listed tag: %s" % (elem.tag)) |
| 668 | 237 elem.drop_tree() |
| 238 else: | |
| 239 elem.drop_tag() | |
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240 if len(body_elt) !=1: |
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241 root_elt = body_elt |
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242 body_elt.tag = "p" |
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243 else: |
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244 root_elt = body_elt[0] |
| 668 | 245 |
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246 return html.tostring(root_elt, encoding='unicode', method='xml') |
| 668 | 247 |
| 248 class XEP_0071_handler(XMPPHandler): | |
| 249 implements(iwokkel.IDisco) | |
| 250 | |
| 251 def __init__(self, plugin_parent): | |
| 252 self.plugin_parent = plugin_parent | |
| 253 self.host = plugin_parent.host | |
| 254 | |
| 255 def getDiscoInfo(self, requestor, target, nodeIdentifier=''): | |
| 256 return [disco.DiscoFeature(NS_XHTML_IM)] | |
| 257 | |
| 258 def getDiscoItems(self, requestor, target, nodeIdentifier=''): | |
| 259 return [] |