Mercurial > libervia-backend
view sat/plugins/plugin_xep_0071.py @ 2590:bd9d92bc0d6c
quick frontends (app): retrieve namespaces on startup
author | Goffi <goffi@goffi.org> |
---|---|
date | Tue, 22 May 2018 10:07:33 +0200 |
parents | 26edcf3a30eb |
children | 56f94936df1e |
line wrap: on
line source
#!/usr/bin/env python2 # -*- coding: utf-8 -*- # SAT plugin for Publish-Subscribe (xep-0071) # Copyright (C) 2009-2018 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 implements # from lxml import etree try: from lxml import html except ImportError: raise exceptions.MissingModule(u"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 dummy: 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 dummy: 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 u'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 u'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(u"xhtml or rich should be present at this point") d_list = defer.DeferredList(defers) d_list.addCallback(lambda dummy: data) return d_list def messageReceivedTrigger(self, client, message, post_treat): """ Check presence of XHTML-IM in message """ try: html_elt = message.elements(NS_XHTML_IM, 'html').next() 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'].iteritems(): if key.startswith('rich'): rich[key[5:]] = value elif key.startswith('xhtml'): xhtml[key[6:]] = value if rich and xhtml: raise exceptions.DataError(_(u"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 u'; '.join([u"%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 = 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(u"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') class XEP_0071_handler(XMPPHandler): implements(iwokkel.IDisco) 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 []