Mercurial > repos > guerler > springsuite

annotate planemo/lib/python3.7/site-packages/bleach/html5lib_shim.py @ 0:d30785e31577 draft

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"planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
author guerler
date Fri, 31 Jul 2020 00:18:57 -0400
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1 # flake8: noqa
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2 """
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3 Shim module between Bleach and html5lib. This makes it easier to upgrade the
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4 html5lib library without having to change a lot of code.
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5 """
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6
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7 from __future__ import unicode_literals
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8
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9 import re
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10 import string
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11
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12 import six
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13
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14 from bleach._vendor.html5lib import (
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15 HTMLParser,
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16 getTreeWalker,
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17 )
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18 from bleach._vendor.html5lib import constants
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19 from bleach._vendor.html5lib.constants import (
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20 namespaces,
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21 prefixes,
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22 )
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23 from bleach._vendor.html5lib.constants import _ReparseException as ReparseException
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24 from bleach._vendor.html5lib.filters.base import Filter
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25 from bleach._vendor.html5lib.filters.sanitizer import allowed_protocols
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26 from bleach._vendor.html5lib.filters.sanitizer import Filter as SanitizerFilter
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27 from bleach._vendor.html5lib._inputstream import HTMLInputStream
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28 from bleach._vendor.html5lib.serializer import HTMLSerializer
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29 from bleach._vendor.html5lib._tokenizer import HTMLTokenizer
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30 from bleach._vendor.html5lib._trie import Trie
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31
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32
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33 #: Map of entity name to expanded entity
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34 ENTITIES = constants.entities
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35
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36 #: Trie of html entity string -> character representation
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37 ENTITIES_TRIE = Trie(ENTITIES)
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38
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39 #: Token type constants--these never change
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40 TAG_TOKEN_TYPES = {
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41 constants.tokenTypes['StartTag'],
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42 constants.tokenTypes['EndTag'],
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43 constants.tokenTypes['EmptyTag']
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44 }
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45 CHARACTERS_TYPE = constants.tokenTypes['Characters']
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46 PARSEERROR_TYPE = constants.tokenTypes['ParseError']
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47
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48
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49 #: List of valid HTML tags, from WHATWG HTML Living Standard as of 2018-10-17
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50 #: https://html.spec.whatwg.org/multipage/indices.html#elements-3
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51 HTML_TAGS = [
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52 'a',
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53 'abbr',
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54 'address',
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55 'area',
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56 'article',
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57 'aside',
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58 'audio',
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59 'b',
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60 'base',
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61 'bdi',
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62 'bdo',
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63 'blockquote',
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64 'body',
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65 'br',
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66 'button',
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67 'canvas',
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68 'caption',
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69 'cite',
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70 'code',
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71 'col',
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72 'colgroup',
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73 'data',
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74 'datalist',
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75 'dd',
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76 'del',
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77 'details',
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78 'dfn',
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79 'dialog',
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80 'div',
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81 'dl',
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82 'dt',
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83 'em',
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84 'embed',
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85 'fieldset',
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86 'figcaption',
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87 'figure',
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88 'footer',
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89 'form',
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90 'h1',
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91 'h2',
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92 'h3',
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93 'h4',
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94 'h5',
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95 'h6',
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96 'head',
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97 'header',
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98 'hgroup',
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99 'hr',
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100 'html',
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101 'i',
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102 'iframe',
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103 'img',
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104 'input',
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105 'ins',
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106 'kbd',
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107 'keygen',
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108 'label',
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109 'legend',
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110 'li',
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111 'link',
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112 'map',
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113 'mark',
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114 'menu',
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115 'meta',
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116 'meter',
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117 'nav',
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118 'noscript',
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119 'object',
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120 'ol',
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121 'optgroup',
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122 'option',
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123 'output',
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124 'p',
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125 'param',
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126 'picture',
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127 'pre',
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128 'progress',
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129 'q',
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130 'rp',
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131 'rt',
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132 'ruby',
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133 's',
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134 'samp',
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135 'script',
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136 'section',
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137 'select',
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138 'slot',
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139 'small',
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140 'source',
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141 'span',
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142 'strong',
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143 'style',
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144 'sub',
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145 'summary',
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146 'sup',
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147 'table',
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148 'tbody',
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149 'td',
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150 'template',
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151 'textarea',
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152 'tfoot',
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153 'th',
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154 'thead',
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155 'time',
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156 'title',
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157 'tr',
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158 'track',
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159 'u',
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160 'ul',
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161 'var',
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162 'video',
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163 'wbr',
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164 ]
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165
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166
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167 class InputStreamWithMemory(object):
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168 """Wraps an HTMLInputStream to remember characters since last <
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169
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170 This wraps existing HTMLInputStream classes to keep track of the stream
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171 since the last < which marked an open tag state.
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172
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173 """
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174 def __init__(self, inner_stream):
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175 self._inner_stream = inner_stream
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176 self.reset = self._inner_stream.reset
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177 self.position = self._inner_stream.position
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178 self._buffer = []
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179
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180 @property
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181 def errors(self):
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182 return self._inner_stream.errors
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183
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184 @property
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185 def charEncoding(self):
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186 return self._inner_stream.charEncoding
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187
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188 @property
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189 def changeEncoding(self):
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190 return self._inner_stream.changeEncoding
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191
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192 def char(self):
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193 c = self._inner_stream.char()
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194 # char() can return None if EOF, so ignore that
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195 if c:
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196 self._buffer.append(c)
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197 return c
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198
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199 def charsUntil(self, characters, opposite=False):
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200 chars = self._inner_stream.charsUntil(characters, opposite=opposite)
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201 self._buffer.extend(list(chars))
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202 return chars
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203
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204 def unget(self, char):
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205 if self._buffer:
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206 self._buffer.pop(-1)
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207 return self._inner_stream.unget(char)
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208
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209 def get_tag(self):
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210 """Returns the stream history since last '<'
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211
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212 Since the buffer starts at the last '<' as as seen by tagOpenState(),
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213 we know that everything from that point to when this method is called
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214 is the "tag" that is being tokenized.
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215
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216 """
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217 return six.text_type('').join(self._buffer)
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218
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219 def start_tag(self):
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220 """Resets stream history to just '<'
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221
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222 This gets called by tagOpenState() which marks a '<' that denotes an
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223 open tag. Any time we see that, we reset the buffer.
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224
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225 """
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226 self._buffer = ['<']
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227
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228
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229 class BleachHTMLTokenizer(HTMLTokenizer):
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230 """Tokenizer that doesn't consume character entities"""
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231 def __init__(self, consume_entities=False, **kwargs):
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232 super(BleachHTMLTokenizer, self).__init__(**kwargs)
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233
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234 self.consume_entities = consume_entities
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235
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236 # Wrap the stream with one that remembers the history
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237 self.stream = InputStreamWithMemory(self.stream)
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238
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239 def __iter__(self):
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240 last_error_token = None
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241
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242 for token in super(BleachHTMLTokenizer, self).__iter__():
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243 if last_error_token is not None:
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244 if ((last_error_token['data'] == 'invalid-character-in-attribute-name' and
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245 token['type'] in TAG_TOKEN_TYPES and
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246 token.get('data'))):
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247 # Remove attribute names that have ', " or < in them
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248 # because those characters are invalid for attribute names.
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249 token['data'] = [
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250 item for item in token['data']
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251 if ('"' not in item[0] and
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252 "'" not in item[0] and
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253 '<' not in item[0])
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254 ]
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255 last_error_token = None
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256 yield token
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257
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258 elif ((last_error_token['data'] == 'expected-closing-tag-but-got-char' and
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259 self.parser.tags is not None and
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260 token['data'].lower().strip() not in self.parser.tags)):
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261 # We've got either a malformed tag or a pseudo-tag or
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262 # something that html5lib wants to turn into a malformed
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263 # comment which Bleach clean() will drop so we interfere
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264 # with the token stream to handle it more correctly.
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265 #
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266 # If this is an allowed tag, it's malformed and we just let
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267 # the html5lib parser deal with it--we don't enter into this
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268 # block.
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269 #
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270 # If this is not an allowed tag, then we convert it to
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271 # characters and it'll get escaped in the sanitizer.
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272 token['data'] = self.stream.get_tag()
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273 token['type'] = CHARACTERS_TYPE
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274
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275 last_error_token = None
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276 yield token
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277
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278 elif token['type'] == PARSEERROR_TYPE:
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279 # If the token is a parse error, then let the last_error_token
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280 # go, and make token the new last_error_token
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281 yield last_error_token
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282 last_error_token = token
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283
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284 else:
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285 yield last_error_token
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286 yield token
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287 last_error_token = None
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288
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289 continue
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290
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291 # If the token is a ParseError, we hold on to it so we can get the
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292 # next token and potentially fix it.
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293 if token['type'] == PARSEERROR_TYPE:
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294 last_error_token = token
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295 continue
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296
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297 yield token
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298
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299 if last_error_token:
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300 yield last_error_token
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301
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302 def consumeEntity(self, allowedChar=None, fromAttribute=False):
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303 # If this tokenizer is set to consume entities, then we can let the
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304 # superclass do its thing.
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305 if self.consume_entities:
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306 return super(BleachHTMLTokenizer, self).consumeEntity(allowedChar, fromAttribute)
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307
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308 # If this tokenizer is set to not consume entities, then we don't want
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309 # to consume and convert them, so this overrides the html5lib tokenizer's
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310 # consumeEntity so that it's now a no-op.
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311 #
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312 # However, when that gets called, it's consumed an &, so we put that back in
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313 # the stream.
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314 if fromAttribute:
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315 self.currentToken['data'][-1][1] += '&'
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316
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317 else:
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318 self.tokenQueue.append({"type": CHARACTERS_TYPE, "data": '&'})
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319
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320 def tagOpenState(self):
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321 # This state marks a < that is either a StartTag, EndTag, EmptyTag,
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322 # or ParseError. In all cases, we want to drop any stream history
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323 # we've collected so far and we do that by calling start_tag() on
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324 # the input stream wrapper.
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325 self.stream.start_tag()
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326 return super(BleachHTMLTokenizer, self).tagOpenState()
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327
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328 def emitCurrentToken(self):
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329 token = self.currentToken
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330
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331 if ((self.parser.tags is not None and
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332 token['type'] in TAG_TOKEN_TYPES and
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333 token['name'].lower() not in self.parser.tags)):
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334 # If this is a start/end/empty tag for a tag that's not in our
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335 # allowed list, then it gets stripped or escaped. In both of these
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336 # cases it gets converted to a Characters token.
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337 if self.parser.strip:
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338 # If we're stripping the token, we just throw in an empty
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339 # string token.
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340 new_data = ''
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341
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342 else:
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343 # If we're escaping the token, we want to escape the exact
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344 # original string. Since tokenizing also normalizes data
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345 # and this is a tag-like thing, we've lost some information.
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346 # So we go back through the stream to get the original
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347 # string and use that.
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348 new_data = self.stream.get_tag()
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349
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350 new_token = {
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351 'type': CHARACTERS_TYPE,
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352 'data': new_data
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353 }
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354
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355 self.currentToken = new_token
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356 self.tokenQueue.append(new_token)
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357 self.state = self.dataState
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358 return
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359
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360 super(BleachHTMLTokenizer, self).emitCurrentToken()
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361
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362
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363 class BleachHTMLParser(HTMLParser):
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364 """Parser that uses BleachHTMLTokenizer"""
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365 def __init__(self, tags, strip, consume_entities, **kwargs):
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366 """
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367 :arg tags: list of allowed tags--everything else is either stripped or
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368 escaped; if None, then this doesn't look at tags at all
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369 :arg strip: whether to strip disallowed tags (True) or escape them (False);
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370 if tags=None, then this doesn't have any effect
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371 :arg consume_entities: whether to consume entities (default behavior) or
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372 leave them as is when tokenizing (BleachHTMLTokenizer-added behavior)
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373
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374 """
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375 self.tags = [tag.lower() for tag in tags] if tags is not None else None
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376 self.strip = strip
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377 self.consume_entities = consume_entities
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378 super(BleachHTMLParser, self).__init__(**kwargs)
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379
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380 def _parse(self, stream, innerHTML=False, container='div', scripting=True, **kwargs):
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381 # set scripting=True to parse <noscript> as though JS is enabled to
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382 # match the expected context in browsers
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383 #
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384 # https://html.spec.whatwg.org/multipage/scripting.html#the-noscript-element
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385 #
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386 # Override HTMLParser so we can swap out the tokenizer for our own.
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387 self.innerHTMLMode = innerHTML
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388 self.container = container
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389 self.scripting = scripting
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390 self.tokenizer = BleachHTMLTokenizer(
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391 stream=stream,
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392 consume_entities=self.consume_entities,
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393 parser=self,
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394 **kwargs
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395 )
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396 self.reset()
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397
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398 try:
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399 self.mainLoop()
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400 except ReparseException:
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401 self.reset()
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402 self.mainLoop()
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403
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404
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405 def convert_entity(value):
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406 """Convert an entity (minus the & and ; part) into what it represents
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407
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408 This handles numeric, hex, and text entities.
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409
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410 :arg value: the string (minus the ``&`` and ``;`` part) to convert
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411
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412 :returns: unicode character or None if it's an ambiguous ampersand that
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413 doesn't match a character entity
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414
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415 """
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416 if value[0] == '#':
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417 if value[1] in ('x', 'X'):
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418 return six.unichr(int(value[2:], 16))
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419 return six.unichr(int(value[1:], 10))
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420
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421 return ENTITIES.get(value, None)
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422
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423
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424 def convert_entities(text):
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425 """Converts all found entities in the text
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426
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427 :arg text: the text to convert entities in
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428
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429 :returns: unicode text with converted entities
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430
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431 """
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432 if '&' not in text:
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433 return text
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434
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435 new_text = []
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436 for part in next_possible_entity(text):
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437 if not part:
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438 continue
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439
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440 if part.startswith('&'):
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441 entity = match_entity(part)
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442 if entity is not None:
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443 converted = convert_entity(entity)
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444
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445 # If it's not an ambiguous ampersand, then replace with the
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446 # unicode character. Otherwise, we leave the entity in.
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447 if converted is not None:
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448 new_text.append(converted)
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449 remainder = part[len(entity) + 2:]
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450 if part:
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451 new_text.append(remainder)
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452 continue
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453
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454 new_text.append(part)
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455
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456 return ''.join(new_text)
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457
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458
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459 def match_entity(stream):
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460 """Returns first entity in stream or None if no entity exists
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461
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462 Note: For Bleach purposes, entities must start with a "&" and end with
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463 a ";". This ignoresambiguous character entities that have no ";" at the
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464 end.
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465
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466 :arg stream: the character stream
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467
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468 :returns: ``None`` or the entity string without "&" or ";"
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469
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470 """
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471 # Nix the & at the beginning
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472 if stream[0] != '&':
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473 raise ValueError('Stream should begin with "&"')
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474
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475 stream = stream[1:]
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476
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477 stream = list(stream)
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478 possible_entity = ''
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479 end_characters = '<&=;' + string.whitespace
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480
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481 # Handle number entities
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482 if stream and stream[0] == '#':
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483 possible_entity = '#'
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484 stream.pop(0)
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485
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486 if stream and stream[0] in ('x', 'X'):
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487 allowed = '0123456789abcdefABCDEF'
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488 possible_entity += stream.pop(0)
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489 else:
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490 allowed = '0123456789'
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491
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492 # FIXME(willkg): Do we want to make sure these are valid number
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493 # entities? This doesn't do that currently.
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494 while stream and stream[0] not in end_characters:
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495 c = stream.pop(0)
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496 if c not in allowed:
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497 break
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498 possible_entity += c
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499
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500 if possible_entity and stream and stream[0] == ';':
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501 return possible_entity
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502 return None
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503
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504 # Handle character entities
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505 while stream and stream[0] not in end_characters:
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506 c = stream.pop(0)
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507 if not ENTITIES_TRIE.has_keys_with_prefix(possible_entity):
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508 break
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509 possible_entity += c
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510
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511 if possible_entity and stream and stream[0] == ';':
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512 return possible_entity
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513
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514 return None
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515
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516
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517 AMP_SPLIT_RE = re.compile('(&)')
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518
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519
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520 def next_possible_entity(text):
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521 """Takes a text and generates a list of possible entities
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522
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523 :arg text: the text to look at
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524
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525 :returns: generator where each part (except the first) starts with an
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526 "&"
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527
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528 """
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529 for i, part in enumerate(AMP_SPLIT_RE.split(text)):
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530 if i == 0:
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531 yield part
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532 elif i % 2 == 0:
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533 yield '&' + part
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534
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535
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536 class BleachHTMLSerializer(HTMLSerializer):
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537 """HTMLSerializer that undoes & -> &amp; in attributes and sets
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538 escape_rcdata to True
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539 """
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540
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541 # per the HTMLSerializer.__init__ docstring:
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542 #
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543 # Whether to escape characters that need to be
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544 # escaped within normal elements within rcdata elements such as
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545 # style.
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546 #
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547 escape_rcdata = True
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548
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549 def escape_base_amp(self, stoken):
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550 """Escapes just bare & in HTML attribute values"""
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551 # First, undo escaping of &. We need to do this because html5lib's
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552 # HTMLSerializer expected the tokenizer to consume all the character
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553 # entities and convert them to their respective characters, but the
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554 # BleachHTMLTokenizer doesn't do that. For example, this fixes
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555 # &amp;entity; back to &entity; .
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556 stoken = stoken.replace('&amp;', '&')
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557
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558 # However, we do want all bare & that are not marking character
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559 # entities to be changed to &amp;, so let's do that carefully here.
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560 for part in next_possible_entity(stoken):
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561 if not part:
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562 continue
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563
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564 if part.startswith('&'):
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565 entity = match_entity(part)
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566 # Only leave entities in that are not ambiguous. If they're
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567 # ambiguous, then we escape the ampersand.
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568 if entity is not None and convert_entity(entity) is not None:
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569 yield '&' + entity + ';'
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570
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571 # Length of the entity plus 2--one for & at the beginning
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572 # and one for ; at the end
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573 part = part[len(entity) + 2:]
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574 if part:
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575 yield part
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576 continue
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577
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578 yield part.replace('&', '&amp;')
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579
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580 def serialize(self, treewalker, encoding=None):
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581 """Wrap HTMLSerializer.serialize and conver & to &amp; in attribute values
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582
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583 Note that this converts & to &amp; in attribute values where the & isn't
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584 already part of an unambiguous character entity.
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585
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586 """
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587 in_tag = False
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588 after_equals = False
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589
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590 for stoken in super(BleachHTMLSerializer, self).serialize(treewalker, encoding):
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591 if in_tag:
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592 if stoken == '>':
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593 in_tag = False
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594
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595 elif after_equals:
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596 if stoken != '"':
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597 for part in self.escape_base_amp(stoken):
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598 yield part
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599
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600 after_equals = False
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601 continue
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602
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603 elif stoken == '=':
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604 after_equals = True
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605
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606 yield stoken
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607 else:
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608 if stoken.startswith('<'):
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609 in_tag = True
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610 yield stoken