Mercurial > libervia-backend
annotate src/plugins/plugin_misc_text_syntaxes.py @ 1727:68e498b3367e
reverted revision 2ebe66a96d05
author | souliane <souliane@mailoo.org> |
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date | Tue, 08 Dec 2015 16:55:54 +0100 |
parents | 94901070478e |
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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 managing various text syntaxes |
1396 | 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 |
771 | 20 from sat.core.i18n import _, D_ |
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21 from sat.core.log import getLogger |
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22 log = getLogger(__name__) |
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23 |
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24 from twisted.internet import defer |
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25 from twisted.internet.threads import deferToThread |
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26 from sat.core import exceptions |
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27 try: |
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28 from lxml import html |
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29 from lxml.html import clean |
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30 except ImportError: |
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31 raise exceptions.MissingModule(u"Missing module lxml, please download/install it from http://lxml.de/") |
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32 from cgi import escape |
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33 import re |
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34 |
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35 |
771 | 36 CATEGORY = D_("Composition") |
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37 NAME = "Syntax" |
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38 _SYNTAX_XHTML = "XHTML" |
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39 _SYNTAX_CURRENT = "@CURRENT@" |
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40 |
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41 # TODO: check/adapt following list |
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42 STYLES_WHITELIST = ["azimuth", "background-color", "border-bottom-color", "border-collapse", "border-color", "border-left-color", "border-right-color", "border-top-color", "clear", "color", "cursor", "direction", "display", "elevation", "float", "font", "font-family", "font-size", "font-style", "font-variant", "font-weight", "height", "letter-spacing", "line-height", "overflow", "pause", "pause-after", "pause-before", "pitch", "pitch-range", "richness", "speak", "speak-header", "speak-numeral", "speak-punctuation", "speech-rate", "stress", "text-align", "text-decoration", "text-indent", "unicode-bidi", "vertical-align", "voice-family", "volume", "white-space", "width"] # based on feedparser list (http://pythonhosted.org/feedparser/html-sanitization.html) |
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43 |
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44 SAFE_ATTRS = html.defs.safe_attrs.union(('style',)) |
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45 STYLES_VALUES_REGEX = r'^(' + '|'.join(['([a-z-]+)', # alphabetical names |
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46 '(#[0-9a-f]+)', # hex value |
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47 '(\d+(.\d+)? *(|%|em|ex|px|in|cm|mm|pt|pc))', # values with units (or not) |
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48 'rgb\( *((\d+(.\d+)?), *){2}(\d+(.\d+)?) *\)', # rgb function |
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49 'rgba\( *((\d+(.\d+)?), *){3}(\d+(.\d+)?) *\)', # rgba function |
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50 ]) + ') *(!important)?$' # we accept "!important" at the end |
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51 STYLES_ACCEPTED_VALUE = re.compile(STYLES_VALUES_REGEX) |
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52 |
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53 PLUGIN_INFO = { |
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54 "name": "Text syntaxes", |
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55 "import_name": "TEXT-SYNTAXES", |
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56 "type": "MISC", |
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57 "protocols": [], |
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58 "dependencies": [], |
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59 "main": "TextSyntaxes", |
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60 "handler": "no", |
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61 "description": _("""Management of various text syntaxes (XHTML-IM, Markdown, etc)""") |
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62 } |
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63 |
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64 class UnknownSyntax(Exception): |
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65 pass |
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66 |
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67 class TextSyntaxes(object): |
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68 """ Text conversion class |
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69 XHTML utf-8 is used as intermediate language for conversions |
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70 """ |
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71 |
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72 OPT_DEFAULT = "DEFAULT" |
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73 OPT_HIDDEN = "HIDDEN" |
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74 OPT_NO_THREAD = "NO_THREAD" |
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75 SYNTAX_XHTML = _SYNTAX_XHTML |
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76 SYNTAX_MARKDOWN = "markdown" |
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77 SYNTAX_TEXT = "text" |
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78 |
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79 params = """ |
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80 <params> |
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81 <individual> |
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82 <category name="%(category_name)s" label="%(category_label)s"> |
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83 <param name="%(name)s" label="%(label)s" type="list" security="0"> |
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84 %(options)s |
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85 </param> |
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86 </category> |
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87 </individual> |
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88 </params> |
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89 """ |
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90 |
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91 params_data = { |
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92 'category_name': CATEGORY, |
771 | 93 'category_label': _(CATEGORY), |
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94 'name': NAME, |
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95 'label': _(NAME), |
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96 'syntaxes': {}, |
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97 } |
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98 |
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99 def __init__(self, host): |
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100 log.info(_("Text syntaxes plugin initialization")) |
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101 self.host = host |
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102 self.syntaxes = {} |
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103 self.addSyntax(self.SYNTAX_XHTML, lambda xhtml: defer.succeed(xhtml), lambda xhtml: defer.succeed(xhtml), |
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104 TextSyntaxes.OPT_NO_THREAD) |
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105 self.addSyntax(self.SYNTAX_TEXT, lambda text: escape(text), lambda xhtml: self._removeMarkups(xhtml), [TextSyntaxes.OPT_HIDDEN]) |
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106 try: |
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107 import markdown, html2text |
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108 |
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109 def _html2text(html, baseurl=''): |
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110 h = html2text.HTML2Text(baseurl=baseurl) |
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111 h.body_width = 0 # do not truncate the lines, it breaks the long URLs |
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112 return h.handle(html) |
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113 self.addSyntax(self.SYNTAX_MARKDOWN, markdown.markdown, _html2text, [TextSyntaxes.OPT_DEFAULT]) |
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114 except ImportError: |
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115 log.warning("markdown or html2text not found, can't use Markdown syntax") |
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116 host.bridge.addMethod("syntaxConvert", ".plugin", in_sign='sssbs', out_sign='s', |
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117 async=True, method=self.convert) |
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118 |
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119 def _updateParamOptions(self): |
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120 data_synt = TextSyntaxes.params_data['syntaxes'] |
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121 syntaxes = [] |
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122 |
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123 for syntax in data_synt.keys(): |
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124 flags = data_synt[syntax]["flags"] |
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125 if TextSyntaxes.OPT_HIDDEN not in flags: |
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126 syntaxes.append(syntax) |
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127 |
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128 syntaxes.sort(key=unicode.lower) |
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129 options = [] |
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130 |
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131 for syntax in syntaxes: |
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132 selected = 'selected="true"' if syntax == _SYNTAX_XHTML else '' |
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133 options.append(u'<option value="%s" %s/>' % (syntax, selected)) |
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134 |
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135 TextSyntaxes.params_data["options"] = u'\n'.join(options) |
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136 self.host.memory.updateParams(TextSyntaxes.params % TextSyntaxes.params_data) |
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137 |
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138 def getCurrentSyntax(self, profile): |
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139 """ Return the selected syntax for the given profile |
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140 |
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141 @param profile: %(doc_profile)s |
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142 @return: profile selected syntax |
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143 """ |
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144 return self.host.memory.getParamA(NAME, CATEGORY , profile_key=profile) |
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145 |
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146 def clean_xhtml(self, xhtml): |
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147 """ Clean XHTML text by removing potentially dangerous/malicious parts |
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148 @param xhtml: raw xhtml text to clean (or lxml's HtmlElement) |
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149 """ |
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150 def blocking_cleaning(xhtml): |
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151 """ Clean XHTML and style attributes """ |
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152 |
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153 def clean_style(styles_raw): |
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154 """" Remove styles not in the whitelist, |
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155 or where the value doesn't match the regex """ |
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156 styles = styles_raw.split(";") |
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157 cleaned_styles = [] |
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158 for style in styles: |
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159 try: |
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160 key, value = style.split(':') |
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161 except ValueError: |
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162 continue |
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163 key = key.lower().strip() |
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164 if key not in STYLES_WHITELIST: |
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165 continue |
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166 value = value.lower().strip() |
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167 if not STYLES_ACCEPTED_VALUE.match(value): |
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168 continue |
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169 if value == "none": |
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170 continue |
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171 cleaned_styles.append((key, value)) |
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172 return "; ".join(["%s: %s" % (key_, value_) for key_, value_ in cleaned_styles]) |
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173 |
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174 if isinstance(xhtml, basestring): |
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175 xhtml_elt = html.fromstring(xhtml) |
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176 elif isinstance(xhtml, html.HtmlElement): |
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177 xhtml_elt = xhtml |
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178 else: |
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179 log.error("Only strings and HtmlElements can be cleaned") |
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180 raise exceptions.DataError |
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181 cleaner = clean.Cleaner(style=False, |
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182 add_nofollow=False, |
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183 safe_attrs=SAFE_ATTRS) |
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184 xhtml_elt = cleaner.clean_html(xhtml_elt) |
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185 for elt in xhtml_elt.xpath("//*[@style]"): |
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186 elt.set("style", clean_style(elt.get('style'))) |
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187 return html.tostring(xhtml_elt, encoding=unicode, method='xml') |
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188 |
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189 return deferToThread(blocking_cleaning, xhtml) |
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190 |
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191 def convert(self, text, syntax_from, syntax_to=_SYNTAX_XHTML, safe=True, profile=None): |
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192 """ Convert a text between two syntaxes |
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193 @param text: text to convert |
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194 @param syntax_from: source syntax (e.g. "markdown") |
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195 @param syntax_to: dest syntax (e.g.: "XHTML") |
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196 @param safe: clean resulting XHTML to avoid malicious code if True |
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197 @param profile: needed only when syntax_from or syntax_to is set to _SYNTAX_CURRENT |
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198 @return: converted text """ |
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199 |
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200 if syntax_from == _SYNTAX_CURRENT: |
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201 syntax_from = self.getCurrentSyntax(profile) |
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202 if syntax_to == _SYNTAX_CURRENT: |
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203 syntax_to = self.getCurrentSyntax(profile) |
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204 syntaxes = TextSyntaxes.params_data['syntaxes'] |
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205 if syntax_from not in syntaxes: |
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206 raise UnknownSyntax(syntax_from) |
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207 if syntax_to not in syntaxes: |
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208 raise UnknownSyntax(syntax_to) |
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209 d = None |
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210 |
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211 if TextSyntaxes.OPT_NO_THREAD in syntaxes[syntax_from]["flags"]: |
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212 d = syntaxes[syntax_from]["to"](text) |
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213 else: |
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214 d = deferToThread(syntaxes[syntax_from]["to"], text) |
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215 |
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216 #TODO: keep only body element and change it to a div here ? |
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217 |
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218 if safe: |
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219 d.addCallback(self.clean_xhtml) |
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220 |
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221 if TextSyntaxes.OPT_NO_THREAD in syntaxes[syntax_to]["flags"]: |
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222 d.addCallback(syntaxes[syntax_to]["from"]) |
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223 else: |
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224 d.addCallback(lambda xhtml: deferToThread(syntaxes[syntax_to]["from"], xhtml)) |
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225 |
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226 # converters can add new lines that disturb the microblog change detection |
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227 d.addCallback(lambda text: text.rstrip()) |
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228 return d |
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229 |
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230 def addSyntax(self, name, to_xhtml_cb, from_xhtml_cb, flags = None): |
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231 """ Add a new syntax to the manager |
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232 @param name: unique name of the syntax |
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233 @param to_xhtml_cb: callback to convert from syntax to XHTML |
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234 @param from_xhtml_cb: callback to convert from XHTML to syntax |
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235 @param flags: set of optional flags, can be: |
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236 TextSyntaxes.OPT_DEFAULT: use as the default syntax (replace former one) |
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237 TextSyntaxes.OPT_HIDDEN: do not show in parameters |
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238 TextSyntaxes.OPT_NO_THREAD: do not defer to thread when converting (the callback must then return a deferred) |
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239 |
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240 """ |
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241 name = unicode(name) |
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242 flags = flags or [] |
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243 if TextSyntaxes.OPT_HIDDEN in flags and TextSyntaxes.OPT_DEFAULT in flags: |
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244 raise ValueError("%s and %s are mutually exclusive" % (TextSyntaxes.OPT_HIDDEN, TextSyntaxes.OPT_DEFAULT)) |
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245 |
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246 syntaxes = TextSyntaxes.params_data['syntaxes'] |
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247 syntaxes[name] = {"to": to_xhtml_cb, "from": from_xhtml_cb, "flags": flags} |
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248 if TextSyntaxes.OPT_DEFAULT in flags: |
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249 syntaxes = TextSyntaxes.params_data['default'] = name |
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250 |
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251 self._updateParamOptions() |
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252 |
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253 def _removeMarkups(self, xhtml): |
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254 """ |
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255 Remove XHTML markups from the given string. |
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256 @param xhtml: the XHTML string to be cleaned |
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257 @return: the cleaned string |
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258 """ |
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259 cleaner = clean.Cleaner(kill_tags=['style']) |
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260 cleaned = cleaner.clean_html(html.fromstring(xhtml)) |
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261 return html.tostring(cleaned, encoding=unicode, method="text") |