Mercurial > libervia-backend
annotate src/plugins/plugin_misc_text_syntaxes.py @ 1525:49d33cb48207
plugin file: first draft:
This plugin will be used to manage file transfers, and choose the best available method.
It embed a class dedicated to files: SatFile, which act as a file objects but manage some high level stuffs (like progression).
author | Goffi <goffi@goffi.org> |
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date | Fri, 25 Sep 2015 19:19:12 +0200 |
parents | 832846fefe85 |
children | 94901070478e |
rev | line source |
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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 from lxml import html |
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28 from lxml.html import clean |
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29 from cgi import escape |
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30 import re |
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31 |
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32 |
771 | 33 CATEGORY = D_("Composition") |
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34 NAME = "Syntax" |
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35 _SYNTAX_XHTML = "XHTML" |
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36 _SYNTAX_CURRENT = "@CURRENT@" |
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37 |
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38 # TODO: check/adapt following list |
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39 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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40 |
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41 SAFE_ATTRS = html.defs.safe_attrs.union(('style',)) |
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42 STYLES_VALUES_REGEX = r'^(' + '|'.join(['([a-z-]+)', # alphabetical names |
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43 '(#[0-9a-f]+)', # hex value |
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44 '(\d+(.\d+)? *(|%|em|ex|px|in|cm|mm|pt|pc))', # values with units (or not) |
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45 'rgb\( *((\d+(.\d+)?), *){2}(\d+(.\d+)?) *\)', # rgb function |
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46 'rgba\( *((\d+(.\d+)?), *){3}(\d+(.\d+)?) *\)', # rgba function |
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47 ]) + ') *(!important)?$' # we accept "!important" at the end |
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48 STYLES_ACCEPTED_VALUE = re.compile(STYLES_VALUES_REGEX) |
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49 |
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50 PLUGIN_INFO = { |
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51 "name": "Text syntaxes", |
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52 "import_name": "TEXT-SYNTAXES", |
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53 "type": "MISC", |
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54 "protocols": [], |
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55 "dependencies": [], |
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56 "main": "TextSyntaxes", |
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57 "handler": "no", |
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58 "description": _("""Management of various text syntaxes (XHTML-IM, Markdown, etc)""") |
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59 } |
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60 |
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61 class UnknownSyntax(Exception): |
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62 pass |
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63 |
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64 class TextSyntaxes(object): |
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65 """ Text conversion class |
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66 XHTML utf-8 is used as intermediate language for conversions |
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67 """ |
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68 |
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69 OPT_DEFAULT = "DEFAULT" |
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70 OPT_HIDDEN = "HIDDEN" |
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71 OPT_NO_THREAD = "NO_THREAD" |
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72 SYNTAX_XHTML = _SYNTAX_XHTML |
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73 SYNTAX_MARKDOWN = "markdown" |
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74 SYNTAX_TEXT = "text" |
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75 |
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76 params = """ |
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77 <params> |
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78 <individual> |
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79 <category name="%(category_name)s" label="%(category_label)s"> |
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80 <param name="%(name)s" label="%(label)s" type="list" security="0"> |
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81 %(options)s |
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82 </param> |
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83 </category> |
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84 </individual> |
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85 </params> |
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86 """ |
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87 |
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88 params_data = { |
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89 'category_name': CATEGORY, |
771 | 90 'category_label': _(CATEGORY), |
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91 'name': NAME, |
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92 'label': _(NAME), |
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93 'syntaxes': {}, |
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94 } |
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95 |
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96 def __init__(self, host): |
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97 log.info(_("Text syntaxes plugin initialization")) |
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98 self.host = host |
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99 self.syntaxes = {} |
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100 self.addSyntax(self.SYNTAX_XHTML, lambda xhtml: defer.succeed(xhtml), lambda xhtml: defer.succeed(xhtml), |
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101 TextSyntaxes.OPT_NO_THREAD) |
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102 self.addSyntax(self.SYNTAX_TEXT, lambda text: escape(text), lambda xhtml: self._removeMarkups(xhtml), [TextSyntaxes.OPT_HIDDEN]) |
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103 try: |
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104 import markdown, html2text |
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105 |
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106 def _html2text(html, baseurl=''): |
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107 h = html2text.HTML2Text(baseurl=baseurl) |
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108 h.body_width = 0 # do not truncate the lines, it breaks the long URLs |
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109 return h.handle(html) |
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110 self.addSyntax(self.SYNTAX_MARKDOWN, markdown.markdown, _html2text, [TextSyntaxes.OPT_DEFAULT]) |
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111 except ImportError: |
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112 log.warning("markdown or html2text not found, can't use Markdown syntax") |
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113 host.bridge.addMethod("syntaxConvert", ".plugin", in_sign='sssbs', out_sign='s', |
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114 async=True, method=self.convert) |
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115 |
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116 def _updateParamOptions(self): |
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117 data_synt = TextSyntaxes.params_data['syntaxes'] |
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118 syntaxes = [] |
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119 |
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120 for syntax in data_synt.keys(): |
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121 flags = data_synt[syntax]["flags"] |
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122 if TextSyntaxes.OPT_HIDDEN not in flags: |
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123 syntaxes.append(syntax) |
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124 |
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125 syntaxes.sort(key=unicode.lower) |
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126 options = [] |
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127 |
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128 for syntax in syntaxes: |
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129 selected = 'selected="true"' if syntax == _SYNTAX_XHTML else '' |
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130 options.append(u'<option value="%s" %s/>' % (syntax, selected)) |
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131 |
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132 TextSyntaxes.params_data["options"] = u'\n'.join(options) |
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133 self.host.memory.updateParams(TextSyntaxes.params % TextSyntaxes.params_data) |
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134 |
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135 def getCurrentSyntax(self, profile): |
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136 """ Return the selected syntax for the given profile |
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137 |
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138 @param profile: %(doc_profile)s |
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139 @return: profile selected syntax |
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140 """ |
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141 return self.host.memory.getParamA(NAME, CATEGORY , profile_key=profile) |
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142 |
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143 def clean_xhtml(self, xhtml): |
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144 """ Clean XHTML text by removing potentially dangerous/malicious parts |
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145 @param xhtml: raw xhtml text to clean (or lxml's HtmlElement) |
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146 """ |
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147 def blocking_cleaning(xhtml): |
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148 """ Clean XHTML and style attributes """ |
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149 |
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150 def clean_style(styles_raw): |
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151 """" Remove styles not in the whitelist, |
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152 or where the value doesn't match the regex """ |
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153 styles = styles_raw.split(";") |
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154 cleaned_styles = [] |
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155 for style in styles: |
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156 try: |
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157 key, value = style.split(':') |
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158 except ValueError: |
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159 continue |
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160 key = key.lower().strip() |
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161 if key not in STYLES_WHITELIST: |
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162 continue |
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163 value = value.lower().strip() |
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164 if not STYLES_ACCEPTED_VALUE.match(value): |
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165 continue |
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166 if value == "none": |
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167 continue |
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168 cleaned_styles.append((key, value)) |
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169 return "; ".join(["%s: %s" % (key_, value_) for key_, value_ in cleaned_styles]) |
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170 |
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171 if isinstance(xhtml, basestring): |
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172 xhtml_elt = html.fromstring(xhtml) |
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173 elif isinstance(xhtml, html.HtmlElement): |
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174 xhtml_elt = xhtml |
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175 else: |
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176 log.error("Only strings and HtmlElements can be cleaned") |
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177 raise exceptions.DataError |
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178 cleaner = clean.Cleaner(style=False, |
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179 add_nofollow=False, |
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180 safe_attrs=SAFE_ATTRS) |
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181 xhtml_elt = cleaner.clean_html(xhtml_elt) |
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182 for elt in xhtml_elt.xpath("//*[@style]"): |
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183 elt.set("style", clean_style(elt.get('style'))) |
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184 return html.tostring(xhtml_elt, encoding=unicode, method='xml') |
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185 |
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186 return deferToThread(blocking_cleaning, xhtml) |
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187 |
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188 def convert(self, text, syntax_from, syntax_to=_SYNTAX_XHTML, safe=True, profile=None): |
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189 """ Convert a text between two syntaxes |
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190 @param text: text to convert |
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191 @param syntax_from: source syntax (e.g. "markdown") |
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192 @param syntax_to: dest syntax (e.g.: "XHTML") |
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193 @param safe: clean resulting XHTML to avoid malicious code if True |
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194 @param profile: needed only when syntax_from or syntax_to is set to _SYNTAX_CURRENT |
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195 @return: converted text """ |
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196 |
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197 if syntax_from == _SYNTAX_CURRENT: |
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198 syntax_from = self.getCurrentSyntax(profile) |
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199 if syntax_to == _SYNTAX_CURRENT: |
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200 syntax_to = self.getCurrentSyntax(profile) |
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201 syntaxes = TextSyntaxes.params_data['syntaxes'] |
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202 if syntax_from not in syntaxes: |
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203 raise UnknownSyntax(syntax_from) |
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204 if syntax_to not in syntaxes: |
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205 raise UnknownSyntax(syntax_to) |
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206 d = None |
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207 |
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208 if TextSyntaxes.OPT_NO_THREAD in syntaxes[syntax_from]["flags"]: |
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209 d = syntaxes[syntax_from]["to"](text) |
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210 else: |
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211 d = deferToThread(syntaxes[syntax_from]["to"], text) |
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212 |
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213 #TODO: keep only body element and change it to a div here ? |
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214 |
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215 if safe: |
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216 d.addCallback(self.clean_xhtml) |
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217 |
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218 if TextSyntaxes.OPT_NO_THREAD in syntaxes[syntax_to]["flags"]: |
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219 d.addCallback(syntaxes[syntax_to]["from"]) |
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220 else: |
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221 d.addCallback(lambda xhtml: deferToThread(syntaxes[syntax_to]["from"], xhtml)) |
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222 |
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223 # converters can add new lines that disturb the microblog change detection |
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224 d.addCallback(lambda text: text.rstrip()) |
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225 return d |
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226 |
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227 def addSyntax(self, name, to_xhtml_cb, from_xhtml_cb, flags = None): |
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228 """ Add a new syntax to the manager |
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229 @param name: unique name of the syntax |
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230 @param to_xhtml_cb: callback to convert from syntax to XHTML |
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231 @param from_xhtml_cb: callback to convert from XHTML to syntax |
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232 @param flags: set of optional flags, can be: |
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233 TextSyntaxes.OPT_DEFAULT: use as the default syntax (replace former one) |
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234 TextSyntaxes.OPT_HIDDEN: do not show in parameters |
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235 TextSyntaxes.OPT_NO_THREAD: do not defer to thread when converting (the callback must then return a deferred) |
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236 |
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237 """ |
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238 name = unicode(name) |
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239 flags = flags or [] |
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240 if TextSyntaxes.OPT_HIDDEN in flags and TextSyntaxes.OPT_DEFAULT in flags: |
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241 raise ValueError("%s and %s are mutually exclusive" % (TextSyntaxes.OPT_HIDDEN, TextSyntaxes.OPT_DEFAULT)) |
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242 |
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243 syntaxes = TextSyntaxes.params_data['syntaxes'] |
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244 syntaxes[name] = {"to": to_xhtml_cb, "from": from_xhtml_cb, "flags": flags} |
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245 if TextSyntaxes.OPT_DEFAULT in flags: |
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246 syntaxes = TextSyntaxes.params_data['default'] = name |
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247 |
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248 self._updateParamOptions() |
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249 |
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250 def _removeMarkups(self, xhtml): |
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251 """ |
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252 Remove XHTML markups from the given string. |
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253 @param xhtml: the XHTML string to be cleaned |
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254 @return: the cleaned string |
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255 """ |
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256 cleaner = clean.Cleaner(kill_tags=['style']) |
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257 cleaned = cleaner.clean_html(html.fromstring(xhtml)) |
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258 return html.tostring(cleaned, encoding=unicode, method="text") |