annotate src/plugins/plugin_xep_0071.py @ 1475:7ac073d2e7e0

core(xmlui): removed useless parenthesis around assert
author Goffi <goffi@goffi.org>
date Tue, 18 Aug 2015 10:52:18 +0200
parents 069ad98b360d
children 94901070478e
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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, 2015 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 sat.core.log import getLogger
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23 log = getLogger(__name__)
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24
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25 from wokkel import disco, iwokkel
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26 from zope.interface import implements
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27 # from lxml import etree
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28 from lxml import html
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29 try:
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30 from twisted.words.protocols.xmlstream import XMPPHandler
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31 except ImportError:
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32 from wokkel.subprotocols import XMPPHandler
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33
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34 NS_XHTML_IM = 'http://jabber.org/protocol/xhtml-im'
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35 NS_XHTML = 'http://www.w3.org/1999/xhtml'
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36
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37 PLUGIN_INFO = {
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38 "name": "XHTML-IM Plugin",
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39 "import_name": "XEP-0071",
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40 "type": "XEP",
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41 "protocols": ["XEP-0071"],
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42 "dependencies": ["TEXT-SYNTAXES"],
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43 "main": "XEP_0071",
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44 "handler": "yes",
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45 "description": _("""Implementation of XHTML-IM""")
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46 }
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47
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48 allowed = {
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49 "a": set(["href", "style", "type"]),
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50 "blockquote": set(["style"]),
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51 "body": set(["style"]),
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52 "br": set([]),
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53 "cite": set(["style"]),
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54 "em": set([]),
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55 "img": set(["alt", "height", "src", "style", "width"]),
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56 "li": set(["style"]),
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57 "ol": set(["style"]),
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58 "p": set(["style"]),
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59 "span": set(["style"]),
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60 "strong": set([]),
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61 "ul": set(["style"]),
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62 }
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63
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64 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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65
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66 blacklist = ['script'] # tag that we have to kill (we don't keep content)
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67
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68
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69 class XEP_0071(object):
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70 SYNTAX_XHTML_IM = "XHTML-IM"
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71
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72 def __init__(self, host):
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73 log.info(_("XHTML-IM plugin initialization"))
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74 self.host = host
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75 self.synt_plg = self.host.plugins["TEXT-SYNTAXES"]
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76 self.synt_plg.addSyntax(self.SYNTAX_XHTML_IM, lambda xhtml: xhtml, self.XHTML2XHTML_IM, [self.synt_plg.OPT_HIDDEN])
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77 host.trigger.add("MessageReceived", self.messageReceivedTrigger)
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78 host.trigger.add("sendMessage", self.sendMessageTrigger)
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79
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80 def getHandler(self, profile):
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81 return XEP_0071_handler(self)
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82
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83 def _messagePostTreat(self, data, body_elt):
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84 """ Callback which manage the post treatment of the message in case of XHTML-IM found
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85 @param data: data send by MessageReceived trigger through post_treat deferred
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86 @param xhtml_im: XHTML-IM body element found
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87 @return: the data with the extra parameter updated
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88 """
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89 #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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90 def converted(xhtml):
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91 data['extra']['xhtml'] = xhtml
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92 return data
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93 d = self.synt_plg.convert(body_elt.toXml(), self.SYNTAX_XHTML_IM, safe=True)
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94 d.addCallback(converted)
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95 return d
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96
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97 def _sendMessageAddRich(self, mess_data, profile):
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98 """ Construct XHTML-IM node and add it XML element
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99 @param mess_data: message data as sended by sendMessage callback
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100 """
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101 def syntax_converted(xhtml_im):
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102 message_elt = mess_data['xml']
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103 html_elt = message_elt.addElement('html', NS_XHTML_IM)
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104 body_elt = html_elt.addElement('body', NS_XHTML)
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105 body_elt.addRawXml(xhtml_im)
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106 mess_data['extra']['xhtml'] = xhtml_im
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107 return mess_data
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108
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109 syntax = self.synt_plg.getCurrentSyntax(profile)
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110 rich = mess_data['extra'].get('rich', '')
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111 xhtml = mess_data['extra'].get('xhtml', '')
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112 if rich:
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113 d = self.synt_plg.convert(rich, syntax, self.SYNTAX_XHTML_IM)
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114 if xhtml:
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115 raise exceptions.DataError(_("Can't have xhtml and rich content at the same time"))
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116 if xhtml:
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117 d = self.synt_plg.clean_xhtml(xhtml)
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118 d.addCallback(syntax_converted)
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119 return d
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120
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121 def messageReceivedTrigger(self, message, post_treat, profile):
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122 """ Check presence of XHTML-IM in message
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123 """
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124 try:
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125 html_elt = message.elements(NS_XHTML_IM, 'html').next()
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126 body_elt = html_elt.elements(NS_XHTML, 'body').next()
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127 # OK, we have found rich text
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128 post_treat.addCallback(self._messagePostTreat, body_elt)
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129 except StopIteration:
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130 # No XHTML-IM
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131 pass
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132 return True
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133
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134 def sendMessageTrigger(self, mess_data, pre_xml_treatments, post_xml_treatments, profile):
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135 """ Check presence of rich text in extra
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136 """
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137 if 'rich' in mess_data['extra'] or 'xhtml' in mess_data['extra']:
922
c897c8d321b3 core: sendMessageTrigger now manage pre and post treatments, which happen before or after XML generation
Goffi <goffi@goffi.org>
parents: 832
diff changeset
138 post_xml_treatments.addCallback(self._sendMessageAddRich, profile)
702
a25db3fe3959 plugin XEP-0071: rich messages management for sendMessage
Goffi <goffi@goffi.org>
parents: 701
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139 return True
a25db3fe3959 plugin XEP-0071: rich messages management for sendMessage
Goffi <goffi@goffi.org>
parents: 701
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140
668
7bb50096d225 plugin XEP_0071: first draft
Goffi <goffi@goffi.org>
parents:
diff changeset
141 def _purgeStyle(self, styles_raw):
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Goffi <goffi@goffi.org>
parents:
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142 """ Remove unauthorised styles according to the XEP-0071
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Goffi <goffi@goffi.org>
parents:
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143 @param styles_raw: raw styles (value of the style attribute)
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Goffi <goffi@goffi.org>
parents:
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144 """
7bb50096d225 plugin XEP_0071: first draft
Goffi <goffi@goffi.org>
parents:
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145 purged = []
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Goffi <goffi@goffi.org>
parents:
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146
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Goffi <goffi@goffi.org>
parents:
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147 styles = [style.strip().split(':') for style in styles_raw.split(';')]
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Goffi <goffi@goffi.org>
parents:
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148
7bb50096d225 plugin XEP_0071: first draft
Goffi <goffi@goffi.org>
parents:
diff changeset
149 for style_tuple in styles:
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Goffi <goffi@goffi.org>
parents:
diff changeset
150 if len(style_tuple) != 2:
7bb50096d225 plugin XEP_0071: first draft
Goffi <goffi@goffi.org>
parents:
diff changeset
151 continue
7bb50096d225 plugin XEP_0071: first draft
Goffi <goffi@goffi.org>
parents:
diff changeset
152 name, value = style_tuple
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Goffi <goffi@goffi.org>
parents:
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153 name = name.strip()
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Goffi <goffi@goffi.org>
parents:
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154 if name not in styles_allowed:
7bb50096d225 plugin XEP_0071: first draft
Goffi <goffi@goffi.org>
parents:
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155 continue
7bb50096d225 plugin XEP_0071: first draft
Goffi <goffi@goffi.org>
parents:
diff changeset
156 purged.append((name, value.strip()))
7bb50096d225 plugin XEP_0071: first draft
Goffi <goffi@goffi.org>
parents:
diff changeset
157
7bb50096d225 plugin XEP_0071: first draft
Goffi <goffi@goffi.org>
parents:
diff changeset
158 return u'; '.join([u"%s: %s" % data for data in purged])
7bb50096d225 plugin XEP_0071: first draft
Goffi <goffi@goffi.org>
parents:
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159
7bb50096d225 plugin XEP_0071: first draft
Goffi <goffi@goffi.org>
parents:
diff changeset
160 def XHTML2XHTML_IM(self, xhtml):
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Goffi <goffi@goffi.org>
parents:
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161 """ Convert XHTML document to XHTML_IM subset
7bb50096d225 plugin XEP_0071: first draft
Goffi <goffi@goffi.org>
parents:
diff changeset
162 @param xhtml: raw xhtml to convert
7bb50096d225 plugin XEP_0071: first draft
Goffi <goffi@goffi.org>
parents:
diff changeset
163 """
7bb50096d225 plugin XEP_0071: first draft
Goffi <goffi@goffi.org>
parents:
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164 # TODO: more clever tag replacement (replace forbidden tags with equivalents when possible)
7bb50096d225 plugin XEP_0071: first draft
Goffi <goffi@goffi.org>
parents:
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165
7bb50096d225 plugin XEP_0071: first draft
Goffi <goffi@goffi.org>
parents:
diff changeset
166 parser = html.HTMLParser(remove_comments=True, encoding='utf-8')
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Goffi <goffi@goffi.org>
parents:
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167 root = html.fromstring(xhtml, parser=parser)
7bb50096d225 plugin XEP_0071: first draft
Goffi <goffi@goffi.org>
parents:
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168 body_elt = root.find('body')
7bb50096d225 plugin XEP_0071: first draft
Goffi <goffi@goffi.org>
parents:
diff changeset
169 if body_elt is None:
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Goffi <goffi@goffi.org>
parents:
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170 # 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
171 body_elt = html.Element('body')
7bb50096d225 plugin XEP_0071: first draft
Goffi <goffi@goffi.org>
parents:
diff changeset
172 body_elt.append(root)
7bb50096d225 plugin XEP_0071: first draft
Goffi <goffi@goffi.org>
parents:
diff changeset
173 else:
7bb50096d225 plugin XEP_0071: first draft
Goffi <goffi@goffi.org>
parents:
diff changeset
174 body_elt.attrib.clear()
7bb50096d225 plugin XEP_0071: first draft
Goffi <goffi@goffi.org>
parents:
diff changeset
175
7bb50096d225 plugin XEP_0071: first draft
Goffi <goffi@goffi.org>
parents:
diff changeset
176 allowed_tags = allowed.keys()
7bb50096d225 plugin XEP_0071: first draft
Goffi <goffi@goffi.org>
parents:
diff changeset
177 to_strip = []
7bb50096d225 plugin XEP_0071: first draft
Goffi <goffi@goffi.org>
parents:
diff changeset
178 for elem in body_elt.iter():
7bb50096d225 plugin XEP_0071: first draft
Goffi <goffi@goffi.org>
parents:
diff changeset
179 if elem.tag not in allowed_tags:
7bb50096d225 plugin XEP_0071: first draft
Goffi <goffi@goffi.org>
parents:
diff changeset
180 to_strip.append(elem)
7bb50096d225 plugin XEP_0071: first draft
Goffi <goffi@goffi.org>
parents:
diff changeset
181 else:
7bb50096d225 plugin XEP_0071: first draft
Goffi <goffi@goffi.org>
parents:
diff changeset
182 # we remove unallowed attributes
7bb50096d225 plugin XEP_0071: first draft
Goffi <goffi@goffi.org>
parents:
diff changeset
183 attrib = elem.attrib
7bb50096d225 plugin XEP_0071: first draft
Goffi <goffi@goffi.org>
parents:
diff changeset
184 att_to_remove = set(attrib).difference(allowed[elem.tag])
7bb50096d225 plugin XEP_0071: first draft
Goffi <goffi@goffi.org>
parents:
diff changeset
185 for att in att_to_remove:
7bb50096d225 plugin XEP_0071: first draft
Goffi <goffi@goffi.org>
parents:
diff changeset
186 del(attrib[att])
7bb50096d225 plugin XEP_0071: first draft
Goffi <goffi@goffi.org>
parents:
diff changeset
187 if "style" in attrib:
7bb50096d225 plugin XEP_0071: first draft
Goffi <goffi@goffi.org>
parents:
diff changeset
188 attrib["style"] = self._purgeStyle(attrib["style"])
7bb50096d225 plugin XEP_0071: first draft
Goffi <goffi@goffi.org>
parents:
diff changeset
189
7bb50096d225 plugin XEP_0071: first draft
Goffi <goffi@goffi.org>
parents:
diff changeset
190 for elem in to_strip:
7bb50096d225 plugin XEP_0071: first draft
Goffi <goffi@goffi.org>
parents:
diff changeset
191 if elem.tag in blacklist:
7bb50096d225 plugin XEP_0071: first draft
Goffi <goffi@goffi.org>
parents:
diff changeset
192 #we need to remove the element and all descendants
993
301b342c697a core: use of the new core.log module:
Goffi <goffi@goffi.org>
parents: 922
diff changeset
193 log.debug(u"removing black listed tag: %s" % (elem.tag))
668
7bb50096d225 plugin XEP_0071: first draft
Goffi <goffi@goffi.org>
parents:
diff changeset
194 elem.drop_tree()
7bb50096d225 plugin XEP_0071: first draft
Goffi <goffi@goffi.org>
parents:
diff changeset
195 else:
7bb50096d225 plugin XEP_0071: first draft
Goffi <goffi@goffi.org>
parents:
diff changeset
196 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
197 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
198 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
199 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
200 else:
98b2400e17d6 plugin XEP-0071: XHTML2XHTML_IM don't return the <body> root tag anymore.
Goffi <goffi@goffi.org>
parents: 668
diff changeset
201 root_elt = body_elt[0]
668
7bb50096d225 plugin XEP_0071: first draft
Goffi <goffi@goffi.org>
parents:
diff changeset
202
701
98b2400e17d6 plugin XEP-0071: XHTML2XHTML_IM don't return the <body> root tag anymore.
Goffi <goffi@goffi.org>
parents: 668
diff changeset
203 return html.tostring(root_elt, encoding='unicode', method='xml')
668
7bb50096d225 plugin XEP_0071: first draft
Goffi <goffi@goffi.org>
parents:
diff changeset
204
7bb50096d225 plugin XEP_0071: first draft
Goffi <goffi@goffi.org>
parents:
diff changeset
205 class XEP_0071_handler(XMPPHandler):
7bb50096d225 plugin XEP_0071: first draft
Goffi <goffi@goffi.org>
parents:
diff changeset
206 implements(iwokkel.IDisco)
7bb50096d225 plugin XEP_0071: first draft
Goffi <goffi@goffi.org>
parents:
diff changeset
207
7bb50096d225 plugin XEP_0071: first draft
Goffi <goffi@goffi.org>
parents:
diff changeset
208 def __init__(self, plugin_parent):
7bb50096d225 plugin XEP_0071: first draft
Goffi <goffi@goffi.org>
parents:
diff changeset
209 self.plugin_parent = plugin_parent
7bb50096d225 plugin XEP_0071: first draft
Goffi <goffi@goffi.org>
parents:
diff changeset
210 self.host = plugin_parent.host
7bb50096d225 plugin XEP_0071: first draft
Goffi <goffi@goffi.org>
parents:
diff changeset
211
7bb50096d225 plugin XEP_0071: first draft
Goffi <goffi@goffi.org>
parents:
diff changeset
212 def getDiscoInfo(self, requestor, target, nodeIdentifier=''):
7bb50096d225 plugin XEP_0071: first draft
Goffi <goffi@goffi.org>
parents:
diff changeset
213 return [disco.DiscoFeature(NS_XHTML_IM)]
7bb50096d225 plugin XEP_0071: first draft
Goffi <goffi@goffi.org>
parents:
diff changeset
214
7bb50096d225 plugin XEP_0071: first draft
Goffi <goffi@goffi.org>
parents:
diff changeset
215 def getDiscoItems(self, requestor, target, nodeIdentifier=''):
7bb50096d225 plugin XEP_0071: first draft
Goffi <goffi@goffi.org>
parents:
diff changeset
216 return []