Mercurial > libervia-backend

annotate src/plugins/plugin_misc_text_syntaxes.py @ 665:6a64e0a759e6

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plugin text syntaxes: this plugin manage rich text syntaxes conversions and cleaning.
author Goffi <goffi@goffi.org>
date Tue, 05 Nov 2013 22:40:46 +0100
parents
children fb0b1100c908
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rev   line source
665
6a64e0a759e6 plugin text syntaxes: this plugin manage rich text syntaxes conversions and cleaning.
Goffi <goffi@goffi.org>
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1 #!/usr/bin/python
6a64e0a759e6 plugin text syntaxes: this plugin manage rich text syntaxes conversions and cleaning.
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2 # -*- coding: utf-8 -*-
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3
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Goffi <goffi@goffi.org>
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4 # SAT plugin for managing various text syntaxes
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5 # Copyright (C) 2009, 2010, 2011, 2012, 2013 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
6a64e0a759e6 plugin text syntaxes: this plugin manage rich text syntaxes conversions and cleaning.
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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
6a64e0a759e6 plugin text syntaxes: this plugin manage rich text syntaxes conversions and cleaning.
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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 logging import debug, info, error
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21
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22 from wokkel import disco, pubsub
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23 from twisted.internet import defer
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24 from twisted.internet.threads import deferToThread
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25 from lxml.html import defs, clean
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26
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27 CATEGORY = "Composition"
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28 NAME = "Syntax"
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29 _SYNTAX_XHTML = "XHTML"
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30
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31
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32 PLUGIN_INFO = {
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33 "name": "Text syntaxes",
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34 "import_name": "TEXT-SYNTAXES",
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35 "type": "MISC",
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36 "protocols": [],
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37 "dependencies": [],
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38 "main": "TextSyntaxes",
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39 "handler": "no",
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40 "description": _("""Management of various text syntaxes (XHTML-IM, Markdown, etc)""")
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41 }
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42
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43 class UnknownSyntax(Exception):
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44 pass
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45
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46 class TextSyntaxes(object):
6a64e0a759e6 plugin text syntaxes: this plugin manage rich text syntaxes conversions and cleaning.
Goffi <goffi@goffi.org>
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47 """ Text conversion class
6a64e0a759e6 plugin text syntaxes: this plugin manage rich text syntaxes conversions and cleaning.
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48 XHTML utf-8 is used as intermediate language for conversions
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49 """
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50
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51 OPT_DEFAULT = "DEFAULT"
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52 OPT_HIDDEN = "HIDDEN"
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53 OPT_NO_THREAD = "NO_THREAD"
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54 SYNTAX_XHTML = _SYNTAX_XHTML
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55 SYNTAX_MARKDOWN = "markdown"
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56
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57 params = """
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58 <params>
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59 <individual>
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60 <category name="%(category_name)s" label="%(category_label)s">
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61 <param name="%(name)s" label="%(label)s"
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62 value="%(default)s" type="list" security="0">
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63 %(options)s
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64 </param>
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65 </category>
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66 </individual>
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67 </params>
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68 """
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69
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70 params_data = {
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71 'category_name': CATEGORY,
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72 'category_label': _(CATEGORY), #FIXME: gof: vérifier que gettext gère ça
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73 'name': NAME,
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Goffi <goffi@goffi.org>
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74 'label': _(NAME),
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75 'default': _SYNTAX_XHTML,
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76 'syntaxes': {},
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77 }
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78
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79 def __init__(self, host):
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Goffi <goffi@goffi.org>
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80 info(_("Text syntaxes plugin initialization"))
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Goffi <goffi@goffi.org>
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81 self.host = host
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82 self.syntaxes = {}
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83 self.addSyntax(self.SYNTAX_XHTML, lambda xhtml: defer.succeed(xhtml), lambda xhtml: defer.succeed(xhtml),
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84 TextSyntaxes.OPT_NO_THREAD)
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85 try:
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86 import markdown, html2text
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87 self.addSyntax(self.SYNTAX_MARKDOWN, markdown.markdown, html2text.html2text, [TextSyntaxes.OPT_DEFAULT])
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88 except ImportError:
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89 warning("markdown or html2text not found, can't use Markdown syntax")
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90 host.bridge.addMethod("syntaxConvert", ".plugin", in_sign='sssb', out_sign='s',
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91 async=True, method=self.convert)
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92
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93 # TODO: gof: nettoyage XHTML avec lxml
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94
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95 def _updateParamOptions(self):
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96 data_synt = TextSyntaxes.params_data['syntaxes']
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97 syntaxes = []
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98
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99 for syntax in data_synt.keys():
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100 flags = data_synt[syntax]["flags"]
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101 if TextSyntaxes.OPT_HIDDEN not in flags:
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102 syntaxes.append(syntax)
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103
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104 syntaxes.sort(key=unicode.lower)
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105 options = []
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106
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107 for syntax in syntaxes:
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108 options.append(u'<option value="%s" />' % syntax)
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109
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110 TextSyntaxes.params_data["options"] = u'\n'.join(options)
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111 self.host.memory.updateParams(TextSyntaxes.params % TextSyntaxes.params_data)
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112
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113 def getFavoriteSyntax(self, profile):
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114 """ Return the selected syntax for the given profile
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115
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116 @param profile: %(doc_profile)s
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117 @return: profile selected syntax
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118 """
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119 return self.host.memory.getParamA(CATEGORY, NAME , profile_key=profile)
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120
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121 def clean_xhtml(self, xhtml):
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Goffi <goffi@goffi.org>
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122 """ Clean XHTML text by removing potentially dangerous/malicious parts
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Goffi <goffi@goffi.org>
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123 @param xhtml: raw xhtml text to clean
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124 """
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Goffi <goffi@goffi.org>
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125 # FIXME: styles are allowed but not cleaned, they have to be cleaned (whitelist ? cssutils ?) !
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Goffi <goffi@goffi.org>
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126 safe_attrs = defs.safe_attrs.union(('style',))
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Goffi <goffi@goffi.org>
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127 cleaner = clean.Cleaner(style=False,
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Goffi <goffi@goffi.org>
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128 add_nofollow=False,
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Goffi <goffi@goffi.org>
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129 safe_attrs=safe_attrs)
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Goffi <goffi@goffi.org>
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130 d = deferToThread(cleaner.clean_html, xhtml)
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Goffi <goffi@goffi.org>
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131 return d
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Goffi <goffi@goffi.org>
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132
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Goffi <goffi@goffi.org>
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133 def convert(self, text, syntax_from, syntax_to=_SYNTAX_XHTML, safe=True):
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Goffi <goffi@goffi.org>
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134 """ Convert a text between two syntaxes
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Goffi <goffi@goffi.org>
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135 @param text: text to convert
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Goffi <goffi@goffi.org>
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136 @param syntax_from: source syntax (e.g. "markdown")
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Goffi <goffi@goffi.org>
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137 @param syntax_to: dest syntax (e.g.: "XHTML")
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Goffi <goffi@goffi.org>
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138 @param safe: clean resulting XHTML to avoid malicious code if True
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Goffi <goffi@goffi.org>
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139 @return: converted text """
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Goffi <goffi@goffi.org>
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140
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Goffi <goffi@goffi.org>
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141 syntaxes = TextSyntaxes.params_data['syntaxes']
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Goffi <goffi@goffi.org>
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142 if syntax_from not in syntaxes:
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Goffi <goffi@goffi.org>
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143 raise UnknownSyntax(syntax_from)
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Goffi <goffi@goffi.org>
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144 if syntax_to not in syntaxes:
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Goffi <goffi@goffi.org>
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145 raise UnknownSyntax(syntax_to)
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Goffi <goffi@goffi.org>
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146 d = None
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Goffi <goffi@goffi.org>
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147
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Goffi <goffi@goffi.org>
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148 if TextSyntaxes.OPT_NO_THREAD in syntaxes[syntax_from]["flags"]:
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Goffi <goffi@goffi.org>
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149 d = syntaxes[syntax_from]["to"](text)
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Goffi <goffi@goffi.org>
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150 else:
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Goffi <goffi@goffi.org>
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151 d = deferToThread(syntaxes[syntax_from]["to"], text)
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Goffi <goffi@goffi.org>
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152
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Goffi <goffi@goffi.org>
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153 #TODO: keep only body element and change it to a div here ?
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Goffi <goffi@goffi.org>
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154
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Goffi <goffi@goffi.org>
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155 if safe:
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Goffi <goffi@goffi.org>
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156 d.addCallback(self.clean_xhtml)
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Goffi <goffi@goffi.org>
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157
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Goffi <goffi@goffi.org>
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158 if TextSyntaxes.OPT_NO_THREAD in syntaxes[syntax_to]["flags"]:
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Goffi <goffi@goffi.org>
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159 d.addCallback(syntaxes[syntax_to]["from"])
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Goffi <goffi@goffi.org>
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160 else:
6a64e0a759e6 plugin text syntaxes: this plugin manage rich text syntaxes conversions and cleaning.
Goffi <goffi@goffi.org>
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161 d.addCallback(lambda xhtml: deferToThread(syntaxes[syntax_to]["from"], xhtml))
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Goffi <goffi@goffi.org>
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162
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Goffi <goffi@goffi.org>
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163 return d
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Goffi <goffi@goffi.org>
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164
6a64e0a759e6 plugin text syntaxes: this plugin manage rich text syntaxes conversions and cleaning.
Goffi <goffi@goffi.org>
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165 def addSyntax(self, name, to_xhtml_cb, from_xhtml_cb, flags = None):
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Goffi <goffi@goffi.org>
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166 """ Add a new syntax to the manager
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Goffi <goffi@goffi.org>
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167 @param name: unique name of the syntax
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Goffi <goffi@goffi.org>
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168 @param to_xhtml_cb: callback to convert from syntax to XHTML
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Goffi <goffi@goffi.org>
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169 @param from_xhtml_cb: callback to convert from XHTML to syntax
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Goffi <goffi@goffi.org>
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170 @param flags: set of optional flags, can be:
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Goffi <goffi@goffi.org>
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171 TextSyntaxes.OPT_DEFAULT: use as the default syntax (replace former one)
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Goffi <goffi@goffi.org>
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172 TextSyntaxes.OPT_HIDDEN: do not show in parameters
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Goffi <goffi@goffi.org>
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173 TextSyntaxes.OPT_NO_THREAD: do not defer to thread when converting (the callback must then return a deferred)
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Goffi <goffi@goffi.org>
parents:
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174
6a64e0a759e6 plugin text syntaxes: this plugin manage rich text syntaxes conversions and cleaning.
Goffi <goffi@goffi.org>
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175 """
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Goffi <goffi@goffi.org>
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176 name = unicode(name)
6a64e0a759e6 plugin text syntaxes: this plugin manage rich text syntaxes conversions and cleaning.
Goffi <goffi@goffi.org>
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177 flags = flags or []
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Goffi <goffi@goffi.org>
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178 if TextSyntaxes.OPT_HIDDEN in flags and TextSyntaxes.OPT_DEFAULT in flags:
6a64e0a759e6 plugin text syntaxes: this plugin manage rich text syntaxes conversions and cleaning.
Goffi <goffi@goffi.org>
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179 raise ValueError("%s and %s are mutually exclusive" % (TextSyntaxes.OPT_HIDDEN, TextSyntaxes.OPT_DEFAULT))
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Goffi <goffi@goffi.org>
parents:
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180
6a64e0a759e6 plugin text syntaxes: this plugin manage rich text syntaxes conversions and cleaning.
Goffi <goffi@goffi.org>
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181 syntaxes = TextSyntaxes.params_data['syntaxes']
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Goffi <goffi@goffi.org>
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182 syntaxes[name] = {"to": to_xhtml_cb, "from": from_xhtml_cb, "flags": flags}
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Goffi <goffi@goffi.org>
parents:
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183 if TextSyntaxes.OPT_DEFAULT in flags:
6a64e0a759e6 plugin text syntaxes: this plugin manage rich text syntaxes conversions and cleaning.
Goffi <goffi@goffi.org>
parents:
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184 syntaxes = TextSyntaxes.params_data['default'] = name
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Goffi <goffi@goffi.org>
parents:
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185
6a64e0a759e6 plugin text syntaxes: this plugin manage rich text syntaxes conversions and cleaning.
Goffi <goffi@goffi.org>
parents:
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186 self._updateParamOptions()
6a64e0a759e6 plugin text syntaxes: this plugin manage rich text syntaxes conversions and cleaning.
Goffi <goffi@goffi.org>
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187