Mercurial > libervia-backend
view sat/plugins/plugin_xep_0071.py @ 3696:52ee22d78e18
plugin XEP-0384: fix encryption for user own devices:
our own jid is added automatically by OMEMO library, but during the generation of the
stanza, our list of jids was used to get the keys (and thus our own jid and devices keys
was missing).
fix 402
author | Goffi <goffi@goffi.org> |
---|---|
date | Fri, 22 Oct 2021 18:46:51 +0200 |
parents | be6d91572633 |
children | 524856bd7b19 |
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#!/usr/bin/env python3 # SAT plugin for Publish-Subscribe (xep-0071) # Copyright (C) 2009-2021 Jérôme Poisson (goffi@goffi.org) # This program is free software: you can redistribute it and/or modify # it under the terms of the GNU Affero General Public License as published by # the Free Software Foundation, either version 3 of the License, or # (at your option) any later version. # This program is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU Affero General Public License for more details. # You should have received a copy of the GNU Affero General Public License # along with this program. If not, see <http://www.gnu.org/licenses/>. from sat.core.i18n import _ from sat.core.constants import Const as C from sat.core import exceptions from sat.core.log import getLogger log = getLogger(__name__) from sat.tools.common import data_format from twisted.internet import defer from wokkel import disco, iwokkel from zope.interface import implementer # from lxml import etree try: from lxml import html except ImportError: raise exceptions.MissingModule( "Missing module lxml, please download/install it from http://lxml.de/" ) try: from twisted.words.protocols.xmlstream import XMPPHandler except ImportError: from wokkel.subprotocols import XMPPHandler NS_XHTML_IM = "http://jabber.org/protocol/xhtml-im" NS_XHTML = "http://www.w3.org/1999/xhtml" PLUGIN_INFO = { C.PI_NAME: "XHTML-IM Plugin", C.PI_IMPORT_NAME: "XEP-0071", C.PI_TYPE: "XEP", C.PI_PROTOCOLS: ["XEP-0071"], C.PI_DEPENDENCIES: ["TEXT_SYNTAXES"], C.PI_MAIN: "XEP_0071", C.PI_HANDLER: "yes", C.PI_DESCRIPTION: _("""Implementation of XHTML-IM"""), } allowed = { "a": set(["href", "style", "type"]), "blockquote": set(["style"]), "body": set(["style"]), "br": set([]), "cite": set(["style"]), "em": set([]), "img": set(["alt", "height", "src", "style", "width"]), "li": set(["style"]), "ol": set(["style"]), "p": set(["style"]), "span": set(["style"]), "strong": set([]), "ul": set(["style"]), } styles_allowed = [ "background-color", "color", "font-family", "font-size", "font-style", "font-weight", "margin-left", "margin-right", "text-align", "text-decoration", ] blacklist = ["script"] # tag that we have to kill (we don't keep content) class XEP_0071(object): SYNTAX_XHTML_IM = "XHTML-IM" def __init__(self, host): log.info(_("XHTML-IM plugin initialization")) self.host = host self._s = self.host.plugins["TEXT_SYNTAXES"] self._s.addSyntax( self.SYNTAX_XHTML_IM, lambda xhtml: xhtml, self.XHTML2XHTML_IM, [self._s.OPT_HIDDEN], ) host.trigger.add("messageReceived", self.messageReceivedTrigger) host.trigger.add("sendMessage", self.sendMessageTrigger) def getHandler(self, client): return XEP_0071_handler(self) def _messagePostTreat(self, data, message_elt, body_elts, client): """Callback which manage the post treatment of the message in case of XHTML-IM found @param data: data send by messageReceived trigger through post_treat deferred @param message_elt: whole <message> stanza @param body_elts: XHTML-IM body elements found @return: the data with the extra parameter updated """ # TODO: check if text only body is empty, then try to convert XHTML-IM to pure text and show a warning message def converted(xhtml, lang): if lang: data["extra"]["xhtml_{}".format(lang)] = xhtml else: data["extra"]["xhtml"] = xhtml defers = [] for body_elt in body_elts: lang = body_elt.getAttribute((C.NS_XML, "lang"), "") treat_d = defer.succeed(None) # deferred used for treatments if self.host.trigger.point( "xhtml_post_treat", client, message_elt, body_elt, lang, treat_d ): continue treat_d.addCallback( lambda __: self._s.convert( body_elt.toXml(), self.SYNTAX_XHTML_IM, safe=True ) ) treat_d.addCallback(converted, lang) defers.append(treat_d) d_list = defer.DeferredList(defers) d_list.addCallback(lambda __: data) return d_list def _fill_body_text(self, text, data, lang): data["message"][lang or ""] = text message_elt = data["xml"] body_elt = message_elt.addElement("body", content=text) if lang: body_elt[(C.NS_XML, "lang")] = lang def _check_body_text(self, data, lang, markup, syntax, defers): """check if simple text message exists, and fill if needed""" if not (lang or "") in data["message"]: d = self._s.convert(markup, syntax, self._s.SYNTAX_TEXT) d.addCallback(self._fill_body_text, data, lang) defers.append(d) def _sendMessageAddRich(self, data, client): """ Construct XHTML-IM node and add it XML element @param data: message data as sended by sendMessage callback """ # at this point, either ['extra']['rich'] or ['extra']['xhtml'] exists # but both can't exist at the same time message_elt = data["xml"] html_elt = message_elt.addElement((NS_XHTML_IM, "html")) def syntax_converted(xhtml_im, lang): body_elt = html_elt.addElement((NS_XHTML, "body")) if lang: body_elt[(C.NS_XML, "lang")] = lang data["extra"]["xhtml_{}".format(lang)] = xhtml_im else: data["extra"]["xhtml"] = xhtml_im body_elt.addRawXml(xhtml_im) syntax = self._s.getCurrentSyntax(client.profile) defers = [] if "xhtml" in data["extra"]: # we have directly XHTML for lang, xhtml in data_format.getSubDict("xhtml", data["extra"]): self._check_body_text(data, lang, xhtml, self._s.SYNTAX_XHTML, defers) d = self._s.convert(xhtml, self._s.SYNTAX_XHTML, self.SYNTAX_XHTML_IM) d.addCallback(syntax_converted, lang) defers.append(d) elif "rich" in data["extra"]: # we have rich syntax to convert for lang, rich_data in data_format.getSubDict("rich", data["extra"]): self._check_body_text(data, lang, rich_data, syntax, defers) d = self._s.convert(rich_data, syntax, self.SYNTAX_XHTML_IM) d.addCallback(syntax_converted, lang) defers.append(d) else: exceptions.InternalError("xhtml or rich should be present at this point") d_list = defer.DeferredList(defers) d_list.addCallback(lambda __: data) return d_list def messageReceivedTrigger(self, client, message, post_treat): """ Check presence of XHTML-IM in message """ try: html_elt = next(message.elements(NS_XHTML_IM, "html")) except StopIteration: # No XHTML-IM pass else: body_elts = html_elt.elements(NS_XHTML, "body") post_treat.addCallback(self._messagePostTreat, message, body_elts, client) return True def sendMessageTrigger(self, client, data, pre_xml_treatments, post_xml_treatments): """ Check presence of rich text in extra """ rich = {} xhtml = {} for key, value in data["extra"].items(): if key.startswith("rich"): rich[key[5:]] = value elif key.startswith("xhtml"): xhtml[key[6:]] = value if rich and xhtml: raise exceptions.DataError( _("Can't have XHTML and rich content at the same time") ) if rich or xhtml: if rich: data["rich"] = rich else: data["xhtml"] = xhtml post_xml_treatments.addCallback(self._sendMessageAddRich, client) return True def _purgeStyle(self, styles_raw): """ Remove unauthorised styles according to the XEP-0071 @param styles_raw: raw styles (value of the style attribute) """ purged = [] styles = [style.strip().split(":") for style in styles_raw.split(";")] for style_tuple in styles: if len(style_tuple) != 2: continue name, value = style_tuple name = name.strip() if name not in styles_allowed: continue purged.append((name, value.strip())) return "; ".join(["%s: %s" % data for data in purged]) def XHTML2XHTML_IM(self, xhtml): """ Convert XHTML document to XHTML_IM subset @param xhtml: raw xhtml to convert """ # TODO: more clever tag replacement (replace forbidden tags with equivalents when possible) parser = html.HTMLParser(remove_comments=True, encoding="utf-8") root = html.fromstring(xhtml, parser=parser) body_elt = root.find("body") if body_elt is None: # we use the whole XML as body if no body element is found body_elt = html.Element("body") body_elt.append(root) else: body_elt.attrib.clear() allowed_tags = list(allowed.keys()) to_strip = [] for elem in body_elt.iter(): if elem.tag not in allowed_tags: to_strip.append(elem) else: # we remove unallowed attributes attrib = elem.attrib att_to_remove = set(attrib).difference(allowed[elem.tag]) for att in att_to_remove: del (attrib[att]) if "style" in attrib: attrib["style"] = self._purgeStyle(attrib["style"]) for elem in to_strip: if elem.tag in blacklist: # we need to remove the element and all descendants log.debug("removing black listed tag: %s" % (elem.tag)) elem.drop_tree() else: elem.drop_tag() if len(body_elt) != 1: root_elt = body_elt body_elt.tag = "p" else: root_elt = body_elt[0] return html.tostring(root_elt, encoding="unicode", method="xml") @implementer(iwokkel.IDisco) class XEP_0071_handler(XMPPHandler): def __init__(self, plugin_parent): self.plugin_parent = plugin_parent self.host = plugin_parent.host def getDiscoInfo(self, requestor, target, nodeIdentifier=""): return [disco.DiscoFeature(NS_XHTML_IM)] def getDiscoItems(self, requestor, target, nodeIdentifier=""): return []