Mercurial > repos > shellac > sam_consensus_v3
annotate env/lib/python3.9/site-packages/boto/gs/cors.py @ 0:4f3585e2f14b draft default tip
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author | shellac |
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date | Mon, 22 Mar 2021 18:12:50 +0000 |
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1 # Copyright 2012 Google Inc. |
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2 # |
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3 # Permission is hereby granted, free of charge, to any person obtaining a |
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4 # copy of this software and associated documentation files (the |
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5 # "Software"), to deal in the Software without restriction, including |
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6 # without limitation the rights to use, copy, modify, merge, publish, dis- |
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7 # tribute, sublicense, and/or sell copies of the Software, and to permit |
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8 # persons to whom the Software is furnished to do so, subject to the fol- |
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9 # lowing conditions: |
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10 # |
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11 # The above copyright notice and this permission notice shall be included |
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12 # in all copies or substantial portions of the Software. |
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13 # |
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14 # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS |
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15 # OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABIL- |
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16 # ITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT |
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17 # SHALL THE AUTHOR BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, |
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18 # WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
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19 # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS |
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20 # IN THE SOFTWARE. |
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21 |
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22 import types |
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23 from boto.gs.user import User |
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24 from boto.exception import InvalidCorsError |
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25 from xml.sax import handler |
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26 |
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27 # Relevant tags for the CORS XML document. |
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28 CORS_CONFIG = 'CorsConfig' |
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29 CORS = 'Cors' |
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30 ORIGINS = 'Origins' |
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31 ORIGIN = 'Origin' |
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32 METHODS = 'Methods' |
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33 METHOD = 'Method' |
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34 HEADERS = 'ResponseHeaders' |
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35 HEADER = 'ResponseHeader' |
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36 MAXAGESEC = 'MaxAgeSec' |
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37 |
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38 class Cors(handler.ContentHandler): |
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39 """Encapsulates the CORS configuration XML document""" |
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40 def __init__(self): |
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41 # List of CORS elements found within a CorsConfig element. |
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42 self.cors = [] |
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43 # List of collections (e.g. Methods, ResponseHeaders, Origins) |
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44 # found within a CORS element. We use a list of lists here |
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45 # instead of a dictionary because the collections need to be |
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46 # preserved in the order in which they appear in the input XML |
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47 # document (and Python dictionary keys are inherently unordered). |
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48 # The elements on this list are two element tuples of the form |
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49 # (collection name, [list of collection contents]). |
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50 self.collections = [] |
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51 # Lists of elements within a collection. Again a list is needed to |
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52 # preserve ordering but also because the same element may appear |
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53 # multiple times within a collection. |
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54 self.elements = [] |
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55 # Dictionary mapping supported collection names to element types |
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56 # which may be contained within each. |
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57 self.legal_collections = { |
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58 ORIGINS : [ORIGIN], |
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59 METHODS : [METHOD], |
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60 HEADERS : [HEADER], |
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61 MAXAGESEC: [] |
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62 } |
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63 # List of supported element types within any collection, used for |
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64 # checking validadity of a parsed element name. |
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65 self.legal_elements = [ORIGIN, METHOD, HEADER] |
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66 |
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67 self.parse_level = 0 |
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68 self.collection = None |
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69 self.element = None |
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70 |
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71 def validateParseLevel(self, tag, level): |
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72 """Verify parse level for a given tag.""" |
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73 if self.parse_level != level: |
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74 raise InvalidCorsError('Invalid tag %s at parse level %d: ' % |
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75 (tag, self.parse_level)) |
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76 |
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77 def startElement(self, name, attrs, connection): |
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78 """SAX XML logic for parsing new element found.""" |
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79 if name == CORS_CONFIG: |
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80 self.validateParseLevel(name, 0) |
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81 self.parse_level += 1; |
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82 elif name == CORS: |
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83 self.validateParseLevel(name, 1) |
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84 self.parse_level += 1; |
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85 elif name in self.legal_collections: |
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86 self.validateParseLevel(name, 2) |
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87 self.parse_level += 1; |
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88 self.collection = name |
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89 elif name in self.legal_elements: |
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90 self.validateParseLevel(name, 3) |
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91 # Make sure this tag is found inside a collection tag. |
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92 if self.collection is None: |
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93 raise InvalidCorsError('Tag %s found outside collection' % name) |
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94 # Make sure this tag is allowed for the current collection tag. |
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95 if name not in self.legal_collections[self.collection]: |
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96 raise InvalidCorsError('Tag %s not allowed in %s collection' % |
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97 (name, self.collection)) |
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98 self.element = name |
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99 else: |
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100 raise InvalidCorsError('Unsupported tag ' + name) |
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101 |
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102 def endElement(self, name, value, connection): |
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103 """SAX XML logic for parsing new element found.""" |
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104 if name == CORS_CONFIG: |
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105 self.validateParseLevel(name, 1) |
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106 self.parse_level -= 1; |
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107 elif name == CORS: |
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108 self.validateParseLevel(name, 2) |
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109 self.parse_level -= 1; |
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110 # Terminating a CORS element, save any collections we found |
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111 # and re-initialize collections list. |
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112 self.cors.append(self.collections) |
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113 self.collections = [] |
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114 elif name in self.legal_collections: |
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115 self.validateParseLevel(name, 3) |
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116 if name != self.collection: |
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117 raise InvalidCorsError('Mismatched start and end tags (%s/%s)' % |
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118 (self.collection, name)) |
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119 self.parse_level -= 1; |
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120 if not self.legal_collections[name]: |
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121 # If this collection doesn't contain any sub-elements, store |
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122 # a tuple of name and this tag's element value. |
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123 self.collections.append((name, value.strip())) |
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124 else: |
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125 # Otherwise, we're terminating a collection of sub-elements, |
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126 # so store a tuple of name and list of contained elements. |
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127 self.collections.append((name, self.elements)) |
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128 self.elements = [] |
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129 self.collection = None |
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130 elif name in self.legal_elements: |
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131 self.validateParseLevel(name, 3) |
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132 # Make sure this tag is found inside a collection tag. |
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133 if self.collection is None: |
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134 raise InvalidCorsError('Tag %s found outside collection' % name) |
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135 # Make sure this end tag is allowed for the current collection tag. |
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136 if name not in self.legal_collections[self.collection]: |
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137 raise InvalidCorsError('Tag %s not allowed in %s collection' % |
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138 (name, self.collection)) |
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139 if name != self.element: |
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140 raise InvalidCorsError('Mismatched start and end tags (%s/%s)' % |
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141 (self.element, name)) |
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142 # Terminating an element tag, add it to the list of elements |
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143 # for the current collection. |
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144 self.elements.append((name, value.strip())) |
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145 self.element = None |
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146 else: |
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147 raise InvalidCorsError('Unsupported end tag ' + name) |
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148 |
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149 def to_xml(self): |
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150 """Convert CORS object into XML string representation.""" |
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151 s = '<' + CORS_CONFIG + '>' |
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152 for collections in self.cors: |
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153 s += '<' + CORS + '>' |
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154 for (collection, elements_or_value) in collections: |
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155 assert collection is not None |
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156 s += '<' + collection + '>' |
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157 # If collection elements has type string, append atomic value, |
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158 # otherwise, append sequence of values in named tags. |
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159 if isinstance(elements_or_value, str): |
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160 s += elements_or_value |
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161 else: |
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162 for (name, value) in elements_or_value: |
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163 assert name is not None |
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164 assert value is not None |
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165 s += '<' + name + '>' + value + '</' + name + '>' |
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166 s += '</' + collection + '>' |
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167 s += '</' + CORS + '>' |
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168 s += '</' + CORS_CONFIG + '>' |
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169 return s |