annotate src/plugins/plugin_xep_0071.py @ 832:c4b22aedb7d7

plugin groupblog, XEP-0071, XEP-0277, text_syntaxes: manage raw/rich/xhtml data for content/title: Implementation should follow the following formal specification: "title" and "content" data can be passed in raw, xhtml or rich format. When we receive from a frontend a new/updated microblog item: - keys "title" or "content" have to be escaped (disable HTML tags) - keys "title_rich" or "content_rich" have to be converted from the current syntax to XHTML - keys "title_xhtml" or "content_xhtml" have to be cleaned from unwanted XHTML content Rules to deal with concurrent keys: - existence of both "*_xhtml" and "*_rich" keys must raise an exception - existence of both raw and ("*_xhtml" or "*_rich") is OK As the storage always need raw data, if it is not given by the user it can be extracted from the "*_rich" or "*_xhtml" data (remove the XHTML tags). When a frontend wants to edit a blog post that contains XHTML title or content, the conversion is made from XHTML to the current user-defined syntax. - plugin text_syntaxes: added "text" syntax (using lxml)
author souliane <souliane@mailoo.org>
date Wed, 05 Feb 2014 16:36:51 +0100
parents 1fe00f0c9a91
children c897c8d321b3
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1 #!/usr/bin/python
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2 # -*- coding: utf-8 -*-
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3
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4 # SAT plugin for Publish-Subscribe (xep-0071)
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5 # Copyright (C) 2009, 2010, 2011, 2012, 2013, 2014 Jérôme Poisson (goffi@goffi.org)
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6
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7 # This program is free software: you can redistribute it and/or modify
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8 # it under the terms of the GNU Affero General Public License as published by
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9 # the Free Software Foundation, either version 3 of the License, or
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10 # (at your option) any later version.
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11
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12 # This program is distributed in the hope that it will be useful,
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13 # but WITHOUT ANY WARRANTY; without even the implied warranty of
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14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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15 # GNU Affero General Public License for more details.
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16
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17 # You should have received a copy of the GNU Affero General Public License
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18 # along with this program. If not, see <http://www.gnu.org/licenses/>.
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19
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20 from sat.core.i18n import _
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21 from sat.core import exceptions
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22 from logging import debug, info, error
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23
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24 from wokkel import disco, pubsub, iwokkel
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25 from zope.interface import implements
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26 # from lxml import etree
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27 from lxml import html
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28 try:
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29 from twisted.words.protocols.xmlstream import XMPPHandler
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30 except ImportError:
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31 from wokkel.subprotocols import XMPPHandler
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32
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33 NS_XHTML_IM = 'http://jabber.org/protocol/xhtml-im'
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34 NS_XHTML = 'http://www.w3.org/1999/xhtml'
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35
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36 PLUGIN_INFO = {
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37 "name": "XHTML-IM Plugin",
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38 "import_name": "XEP-0071",
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39 "type": "XEP",
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40 "protocols": ["XEP-0071"],
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41 "dependencies": ["TEXT-SYNTAXES"],
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42 "main": "XEP_0071",
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43 "handler": "yes",
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44 "description": _("""Implementation of XHTML-IM""")
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45 }
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46
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47 allowed = {
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48 "a": set(["href", "style", "type"]),
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49 "blockquote": set(["style"]),
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50 "body": set(["style"]),
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51 "br": set([]),
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52 "cite": set(["style"]),
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53 "em": set([]),
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54 "img": set(["alt", "height", "src", "style", "width"]),
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55 "li": set(["style"]),
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56 "ol": set(["style"]),
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57 "p": set(["style"]),
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58 "span": set(["style"]),
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59 "strong": set([]),
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60 "ul": set(["style"]),
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61 }
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62
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63 styles_allowed = ["background-color", "color", "font-family", "font-size", "font-style", "font-weight", "margin-left", "margin-right", "text-align", "text-decoration"]
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64
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65 blacklist = ['script'] # tag that we have to kill (we don't keep content)
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67
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68 class XEP_0071(object):
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69 SYNTAX_XHTML_IM = "XHTML-IM"
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70
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71 def __init__(self, host):
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72 info(_("XHTML-IM plugin initialization"))
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73 self.host = host
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74 self.synt_plg = self.host.plugins["TEXT-SYNTAXES"]
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75 self.synt_plg.addSyntax(self.SYNTAX_XHTML_IM, lambda xhtml: xhtml, self.XHTML2XHTML_IM, [self.synt_plg.OPT_HIDDEN])
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76 host.trigger.add("MessageReceived", self.messageReceivedTrigger)
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77 host.trigger.add("sendMessage", self.sendMessageTrigger)
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78
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79 def getHandler(self, profile):
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80 return XEP_0071_handler(self)
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81
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82 def _messagePostTreat(self, data, body_elt):
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83 """ Callback which manage the post treatment of the message in case of XHTML-IM found
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84 @param data: data send by MessageReceived trigger through post_treat deferred
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85 @param xhtml_im: XHTML-IM body element found
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86 @return: the data with the extra parameter updated
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87 """
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88 #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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89 def converted(xhtml):
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90 data['extra']['xhtml'] = xhtml
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91 return data
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92 d = self.synt_plg.convert(body_elt.toXml(), self.SYNTAX_XHTML_IM, safe=True)
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93 d.addCallback(converted)
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94 return d
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95
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96 def _sendMessageAddRich(self, mess_data, profile):
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97 """ Construct XHTML-IM node and add it XML element
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98 @param mess_data: message data as sended by sendMessage callback
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99 """
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100 def syntax_converted(xhtml_im):
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101 message_elt = mess_data['xml']
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102 html_elt = message_elt.addElement('html', NS_XHTML_IM)
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103 body_elt = html_elt.addElement('body', NS_XHTML)
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104 body_elt.addRawXml(xhtml_im)
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105 mess_data['extra']['xhtml'] = xhtml_im
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106 return mess_data
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107
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108 syntax = self.synt_plg.getCurrentSyntax(profile)
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109 rich = mess_data['extra'].get('rich', '')
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110 xhtml = mess_data['extra'].get('xhtml', '')
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111 if rich:
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112 d = self.synt_plg.convert(rich, syntax, self.SYNTAX_XHTML_IM)
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113 if xhtml:
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114 raise exceptions.DataError(_("Can't have xhtml and rich content at the same time"))
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115 if xhtml:
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116 d = self.synt_plg.clean_xhtml(xhtml)
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117 d.addCallback(syntax_converted)
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118 return d
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119
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120 def messageReceivedTrigger(self, message, post_treat, profile):
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121 """ Check presence of XHTML-IM in message
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122 """
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123 try:
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124 html_elt = message.elements(NS_XHTML_IM, 'html').next()
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125 body_elt = html_elt.elements(NS_XHTML, 'body').next()
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126 # OK, we have found rich text
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127 post_treat.addCallback(self._messagePostTreat, body_elt)
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128 except StopIteration:
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129 # No XHTML-IM
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130 pass
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131 return True
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132
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133 def sendMessageTrigger(self, mess_data, treatments, profile):
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diff changeset
134 """ Check presence of rich text in extra
a25db3fe3959 plugin XEP-0071: rich messages management for sendMessage
Goffi <goffi@goffi.org>
parents: 701
diff changeset
135 """
832
c4b22aedb7d7 plugin groupblog, XEP-0071, XEP-0277, text_syntaxes: manage raw/rich/xhtml data for content/title:
souliane <souliane@mailoo.org>
parents: 811
diff changeset
136 if 'rich' in mess_data['extra'] or 'xhtml' in mess_data['extra']:
702
a25db3fe3959 plugin XEP-0071: rich messages management for sendMessage
Goffi <goffi@goffi.org>
parents: 701
diff changeset
137 treatments.addCallback(self._sendMessageAddRich, profile)
a25db3fe3959 plugin XEP-0071: rich messages management for sendMessage
Goffi <goffi@goffi.org>
parents: 701
diff changeset
138 return True
a25db3fe3959 plugin XEP-0071: rich messages management for sendMessage
Goffi <goffi@goffi.org>
parents: 701
diff changeset
139
668
7bb50096d225 plugin XEP_0071: first draft
Goffi <goffi@goffi.org>
parents:
diff changeset
140 def _purgeStyle(self, styles_raw):
7bb50096d225 plugin XEP_0071: first draft
Goffi <goffi@goffi.org>
parents:
diff changeset
141 """ Remove unauthorised styles according to the XEP-0071
7bb50096d225 plugin XEP_0071: first draft
Goffi <goffi@goffi.org>
parents:
diff changeset
142 @param styles_raw: raw styles (value of the style attribute)
7bb50096d225 plugin XEP_0071: first draft
Goffi <goffi@goffi.org>
parents:
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143 """
7bb50096d225 plugin XEP_0071: first draft
Goffi <goffi@goffi.org>
parents:
diff changeset
144 purged = []
7bb50096d225 plugin XEP_0071: first draft
Goffi <goffi@goffi.org>
parents:
diff changeset
145
7bb50096d225 plugin XEP_0071: first draft
Goffi <goffi@goffi.org>
parents:
diff changeset
146 styles = [style.strip().split(':') for style in styles_raw.split(';')]
7bb50096d225 plugin XEP_0071: first draft
Goffi <goffi@goffi.org>
parents:
diff changeset
147
7bb50096d225 plugin XEP_0071: first draft
Goffi <goffi@goffi.org>
parents:
diff changeset
148 for style_tuple in styles:
7bb50096d225 plugin XEP_0071: first draft
Goffi <goffi@goffi.org>
parents:
diff changeset
149 if len(style_tuple) != 2:
7bb50096d225 plugin XEP_0071: first draft
Goffi <goffi@goffi.org>
parents:
diff changeset
150 continue
7bb50096d225 plugin XEP_0071: first draft
Goffi <goffi@goffi.org>
parents:
diff changeset
151 name, value = style_tuple
7bb50096d225 plugin XEP_0071: first draft
Goffi <goffi@goffi.org>
parents:
diff changeset
152 name = name.strip()
7bb50096d225 plugin XEP_0071: first draft
Goffi <goffi@goffi.org>
parents:
diff changeset
153 if name not in styles_allowed:
7bb50096d225 plugin XEP_0071: first draft
Goffi <goffi@goffi.org>
parents:
diff changeset
154 continue
7bb50096d225 plugin XEP_0071: first draft
Goffi <goffi@goffi.org>
parents:
diff changeset
155 purged.append((name, value.strip()))
7bb50096d225 plugin XEP_0071: first draft
Goffi <goffi@goffi.org>
parents:
diff changeset
156
7bb50096d225 plugin XEP_0071: first draft
Goffi <goffi@goffi.org>
parents:
diff changeset
157 return u'; '.join([u"%s: %s" % data for data in purged])
7bb50096d225 plugin XEP_0071: first draft
Goffi <goffi@goffi.org>
parents:
diff changeset
158
7bb50096d225 plugin XEP_0071: first draft
Goffi <goffi@goffi.org>
parents:
diff changeset
159 def XHTML2XHTML_IM(self, xhtml):
7bb50096d225 plugin XEP_0071: first draft
Goffi <goffi@goffi.org>
parents:
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160 """ Convert XHTML document to XHTML_IM subset
7bb50096d225 plugin XEP_0071: first draft
Goffi <goffi@goffi.org>
parents:
diff changeset
161 @param xhtml: raw xhtml to convert
7bb50096d225 plugin XEP_0071: first draft
Goffi <goffi@goffi.org>
parents:
diff changeset
162 """
7bb50096d225 plugin XEP_0071: first draft
Goffi <goffi@goffi.org>
parents:
diff changeset
163 # TODO: more clever tag replacement (replace forbidden tags with equivalents when possible)
7bb50096d225 plugin XEP_0071: first draft
Goffi <goffi@goffi.org>
parents:
diff changeset
164
7bb50096d225 plugin XEP_0071: first draft
Goffi <goffi@goffi.org>
parents:
diff changeset
165 parser = html.HTMLParser(remove_comments=True, encoding='utf-8')
7bb50096d225 plugin XEP_0071: first draft
Goffi <goffi@goffi.org>
parents:
diff changeset
166 root = html.fromstring(xhtml, parser=parser)
7bb50096d225 plugin XEP_0071: first draft
Goffi <goffi@goffi.org>
parents:
diff changeset
167 body_elt = root.find('body')
7bb50096d225 plugin XEP_0071: first draft
Goffi <goffi@goffi.org>
parents:
diff changeset
168 if body_elt is None:
7bb50096d225 plugin XEP_0071: first draft
Goffi <goffi@goffi.org>
parents:
diff changeset
169 # we use the whole XML as body if no body element is found
7bb50096d225 plugin XEP_0071: first draft
Goffi <goffi@goffi.org>
parents:
diff changeset
170 body_elt = html.Element('body')
7bb50096d225 plugin XEP_0071: first draft
Goffi <goffi@goffi.org>
parents:
diff changeset
171 body_elt.append(root)
7bb50096d225 plugin XEP_0071: first draft
Goffi <goffi@goffi.org>
parents:
diff changeset
172 else:
7bb50096d225 plugin XEP_0071: first draft
Goffi <goffi@goffi.org>
parents:
diff changeset
173 body_elt.attrib.clear()
7bb50096d225 plugin XEP_0071: first draft
Goffi <goffi@goffi.org>
parents:
diff changeset
174
7bb50096d225 plugin XEP_0071: first draft
Goffi <goffi@goffi.org>
parents:
diff changeset
175 allowed_tags = allowed.keys()
7bb50096d225 plugin XEP_0071: first draft
Goffi <goffi@goffi.org>
parents:
diff changeset
176 to_strip = []
7bb50096d225 plugin XEP_0071: first draft
Goffi <goffi@goffi.org>
parents:
diff changeset
177 for elem in body_elt.iter():
7bb50096d225 plugin XEP_0071: first draft
Goffi <goffi@goffi.org>
parents:
diff changeset
178 if elem.tag not in allowed_tags:
7bb50096d225 plugin XEP_0071: first draft
Goffi <goffi@goffi.org>
parents:
diff changeset
179 to_strip.append(elem)
7bb50096d225 plugin XEP_0071: first draft
Goffi <goffi@goffi.org>
parents:
diff changeset
180 else:
7bb50096d225 plugin XEP_0071: first draft
Goffi <goffi@goffi.org>
parents:
diff changeset
181 # we remove unallowed attributes
7bb50096d225 plugin XEP_0071: first draft
Goffi <goffi@goffi.org>
parents:
diff changeset
182 attrib = elem.attrib
7bb50096d225 plugin XEP_0071: first draft
Goffi <goffi@goffi.org>
parents:
diff changeset
183 att_to_remove = set(attrib).difference(allowed[elem.tag])
7bb50096d225 plugin XEP_0071: first draft
Goffi <goffi@goffi.org>
parents:
diff changeset
184 for att in att_to_remove:
7bb50096d225 plugin XEP_0071: first draft
Goffi <goffi@goffi.org>
parents:
diff changeset
185 del(attrib[att])
7bb50096d225 plugin XEP_0071: first draft
Goffi <goffi@goffi.org>
parents:
diff changeset
186 if "style" in attrib:
7bb50096d225 plugin XEP_0071: first draft
Goffi <goffi@goffi.org>
parents:
diff changeset
187 attrib["style"] = self._purgeStyle(attrib["style"])
7bb50096d225 plugin XEP_0071: first draft
Goffi <goffi@goffi.org>
parents:
diff changeset
188
7bb50096d225 plugin XEP_0071: first draft
Goffi <goffi@goffi.org>
parents:
diff changeset
189 for elem in to_strip:
7bb50096d225 plugin XEP_0071: first draft
Goffi <goffi@goffi.org>
parents:
diff changeset
190 if elem.tag in blacklist:
7bb50096d225 plugin XEP_0071: first draft
Goffi <goffi@goffi.org>
parents:
diff changeset
191 #we need to remove the element and all descendants
7bb50096d225 plugin XEP_0071: first draft
Goffi <goffi@goffi.org>
parents:
diff changeset
192 debug(u"removing black listed tag: %s" % (elem.tag))
7bb50096d225 plugin XEP_0071: first draft
Goffi <goffi@goffi.org>
parents:
diff changeset
193 elem.drop_tree()
7bb50096d225 plugin XEP_0071: first draft
Goffi <goffi@goffi.org>
parents:
diff changeset
194 else:
7bb50096d225 plugin XEP_0071: first draft
Goffi <goffi@goffi.org>
parents:
diff changeset
195 elem.drop_tag()
701
98b2400e17d6 plugin XEP-0071: XHTML2XHTML_IM don't return the <body> root tag anymore.
Goffi <goffi@goffi.org>
parents: 668
diff changeset
196 if len(body_elt) !=1:
98b2400e17d6 plugin XEP-0071: XHTML2XHTML_IM don't return the <body> root tag anymore.
Goffi <goffi@goffi.org>
parents: 668
diff changeset
197 root_elt = body_elt
98b2400e17d6 plugin XEP-0071: XHTML2XHTML_IM don't return the <body> root tag anymore.
Goffi <goffi@goffi.org>
parents: 668
diff changeset
198 body_elt.tag = "p"
98b2400e17d6 plugin XEP-0071: XHTML2XHTML_IM don't return the <body> root tag anymore.
Goffi <goffi@goffi.org>
parents: 668
diff changeset
199 else:
98b2400e17d6 plugin XEP-0071: XHTML2XHTML_IM don't return the <body> root tag anymore.
Goffi <goffi@goffi.org>
parents: 668
diff changeset
200 root_elt = body_elt[0]
668
7bb50096d225 plugin XEP_0071: first draft
Goffi <goffi@goffi.org>
parents:
diff changeset
201
701
98b2400e17d6 plugin XEP-0071: XHTML2XHTML_IM don't return the <body> root tag anymore.
Goffi <goffi@goffi.org>
parents: 668
diff changeset
202 return html.tostring(root_elt, encoding='unicode', method='xml')
668
7bb50096d225 plugin XEP_0071: first draft
Goffi <goffi@goffi.org>
parents:
diff changeset
203
7bb50096d225 plugin XEP_0071: first draft
Goffi <goffi@goffi.org>
parents:
diff changeset
204 class XEP_0071_handler(XMPPHandler):
7bb50096d225 plugin XEP_0071: first draft
Goffi <goffi@goffi.org>
parents:
diff changeset
205 implements(iwokkel.IDisco)
7bb50096d225 plugin XEP_0071: first draft
Goffi <goffi@goffi.org>
parents:
diff changeset
206
7bb50096d225 plugin XEP_0071: first draft
Goffi <goffi@goffi.org>
parents:
diff changeset
207 def __init__(self, plugin_parent):
7bb50096d225 plugin XEP_0071: first draft
Goffi <goffi@goffi.org>
parents:
diff changeset
208 self.plugin_parent = plugin_parent
7bb50096d225 plugin XEP_0071: first draft
Goffi <goffi@goffi.org>
parents:
diff changeset
209 self.host = plugin_parent.host
7bb50096d225 plugin XEP_0071: first draft
Goffi <goffi@goffi.org>
parents:
diff changeset
210
7bb50096d225 plugin XEP_0071: first draft
Goffi <goffi@goffi.org>
parents:
diff changeset
211 def getDiscoInfo(self, requestor, target, nodeIdentifier=''):
7bb50096d225 plugin XEP_0071: first draft
Goffi <goffi@goffi.org>
parents:
diff changeset
212 return [disco.DiscoFeature(NS_XHTML_IM)]
7bb50096d225 plugin XEP_0071: first draft
Goffi <goffi@goffi.org>
parents:
diff changeset
213
7bb50096d225 plugin XEP_0071: first draft
Goffi <goffi@goffi.org>
parents:
diff changeset
214 def getDiscoItems(self, requestor, target, nodeIdentifier=''):
7bb50096d225 plugin XEP_0071: first draft
Goffi <goffi@goffi.org>
parents:
diff changeset
215 return []