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annotate farolluz/parsers/cpe.py @ 41:bb1dd2a55643

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CPE: Add a generic 'parse' method
author Benoît Allard <benoit.allard@greenbone.net>
date Mon, 29 Dec 2014 14:58:29 +0100
parents 1d9b2b06067e
children 3826f2701ff2
rev   line source
41
bb1dd2a55643 CPE: Add a generic 'parse' method
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1 # -*- coding: utf-8 -*-
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2 # Description:
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3 # Methods for parsing CPEs
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4 #
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5 # Authors:
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6 # Benoît Allard <benoit.allard@greenbone.net>
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7 #
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8 # Copyright:
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9 # Copyright (C) 2014 Greenbone Networks GmbH
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10 #
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11 # This program is free software; you can redistribute it and/or
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12 # modify it under the terms of the GNU General Public License
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13 # as published by the Free Software Foundation; either version 2
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14 # of the License, or (at your option) any later version.
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15 #
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16 # This program is distributed in the hope that it will be useful,
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17 # but WITHOUT ANY WARRANTY; without even the implied warranty of
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18 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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19 # GNU General Public License for more details.
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20 #
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21 # You should have received a copy of the GNU General Public License
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22 # along with this program; if not, write to the Free Software
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23 # Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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24
40
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25 """\
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26 a cpe class to ease the creation of a producttree based on cpe
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27
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28 This is based on:
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29
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30 NIST Interagency Report 7695
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31 Common Platform Enumeration: Naming Specification Version 2.3
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32
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33 CPE is a trademark of The MITRE Corporation.
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34
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35 """
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36
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37 import re
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38
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39 PCT_MAP ={'!': "%21", '"': "%22", '#': "%23", '$': "%24", '%': "%25", '&': "%26",
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40 "'": "%27", '(': "%28", ')': "%29", '*': "%2a", '+': "%2b", ',': "%2c",
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41 '/': "%2f", ':': "%3a", ';': "%3b", '<': "%3c", "=": "%3d", '>': "%3e",
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42 '?': "%3f", '@': "%40", '[': "%5b", '\\': "%5c","]": "%5d", '^': "%5e",
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43 '`': "%60", '{': "%7b", '|': "%7c", '}': "%7d", "~": "%7e"}
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44
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45 PCT_MAP_i = dict((v, k) for k, v in PCT_MAP.iteritems())
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46
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47 def pct_encode(c):
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48 """ Returns the right percent-encoding of c """
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49 if c in "-.":
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50 return c
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51 return PCT_MAP[c]
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52 return {'!': "%21", '"': "%22", '#': "%23", '$': "%24", '%': "%25", '&': "%26",
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53 "'": "%27", '(': "%28", ')': "%29", '*': "%2a", '+': "%2b", ',': "%2c",
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54 "-": c, '.': c, '/': "%2f", ':': "%3a", ';': "%3b", '<': "%3c",
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55 "=": "%3d", '>': "%3e", '?': "%3f", '@': "%40", '[': "%5b", '\\': "%5c",
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56 "]": "%5d", '^': "%5e", '`': "%60", '{': "%7b", '|': "%7c", '}': "%7d",
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57 "~": "%7e"}[c]
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58
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59 def decode(s):
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60 if s == '':
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61 return ANY
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62 if s == '-':
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63 return NA
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64 s = s.lower()
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65 res = ""
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66 idx = 0
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67 embedded = False
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68 while idx < len(s):
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69 c = s[idx]
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70 if c in ".-~":
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71 res += "\\" + c
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72 embedded = True
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73 elif c != '%':
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74 res += c
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75 embedded = True
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76 else:
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77 form = s[idx:idx+3]
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78 if form == "%01":
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79 if (((idx == 0) or (idx == (len(s) - 3))) or
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80 ( not embedded and (s[idx-4:idx-1] == "%01")) or
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81 (embedded and (len(s) > idx + 6) and (s[idx+3:idx+6] == "%01"))):
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82 res += '?'
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83 else:
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84 raise ValueError
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85 elif form == "%02":
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86 if (idx == 0) or (idx == len(s) - 3):
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87 res += '*'
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88 else:
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89 raise ValueError
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90 else:
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91 res += '\\' + PCT_MAP_i[form]
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92 embedded = True
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93 idx += 2
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94 idx += 1
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95 return CPEAttribute(res)
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96
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97 def unbind_value_fs(s):
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98 if s == '*':
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99 return ANY
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100 if s == '-':
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101 return NA
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102 res = ""
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103 idx = 0
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104 embedded = False
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105 while idx < len(s):
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106 c = s[idx]
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107 if re.match("[a-zA-Z0-9_]", c) is not None:
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108 res += c
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109 embedded = True
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110 elif c == "\\":
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111 res += s[idx:idx+2]
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112 embedded = True
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113 idx += 1
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114 elif c == "*":
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115 if (idx == 0) or (idx == (len(s) - 1)):
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116 res += c
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117 embedded = True
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118 else:
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119 raise ValueError
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120 elif c == "?":
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121 if (((idx == 0) or (idx == (len(s) - 1))) or
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122 (not embedded and (s[idx - 1] == "?")) or
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123 (embedded and (s[idx + 1] == "?"))):
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124 res += c
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125 embedded = False
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126 else:
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127 raise ValueError
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128 else:
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129 res += "\\" + c
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130 embedded = True
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131 idx += 1
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132 return CPEAttribute(res)
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133
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134 class CPEAttribute(object):
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135 """ We need a special class to deal with ANY / NA / "string" """
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136
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137 def __init__(self, value=None, any=False, na=False):
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138 self.any = any
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139 self.na = na
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140 self.value = value
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141
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142 def bind_for_URI(self):
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143 # print self.any, self.na, self.value
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144 if self.any:
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145 return ""
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146 if self.na:
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147 return '-'
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148 return self.transform_for_uri()
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149
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150 def transform_for_uri(self):
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151 res = ""
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152 idx = 0
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153 while idx < len(self.value):
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154 c = self.value[idx]
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155 if re.match("[a-zA-Z0-9_]", c) is not None:
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156 res += c
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157 elif c == '\\':
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158 idx += 1
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159 c = self.value[idx]
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160 res += pct_encode(c)
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161 elif c == '?':
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162 res += "%01"
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163 elif c == '*':
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164 res += "%02"
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165 idx += 1
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166 return res
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167
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168 def bind_for_fs(self):
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169 if self.any:
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170 return "*"
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171 if self.na:
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172 return "-"
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173 return self.process_quoted_chars()
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174
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175 def process_quoted_chars(self):
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176 res = ""
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177 idx = 0
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178 while idx < len(self.value):
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179 c = self.value[idx]
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180 if c != '\\':
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181 res += c
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182 else:
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183 idx += 1
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184 c = self.value[idx]
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185 if c in ".-_":
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186 res += c
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187 else:
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188 res += '\\' + c
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189 idx += 1
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190 return res
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191
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192 ANY = CPEAttribute(any=True)
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193 NA = CPEAttribute(na=True)
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194
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195 class CPE(object):
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196
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197 def __init__(self, part=None, vendor=None, product=None, version=None, update=None, edition=None, language=None, sw_edition=None, target_sw=None, target_hw=None, other=None):
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198 self.part = part or CPEAttribute(any=True)
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199 self.vendor = vendor or CPEAttribute(any=True)
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200 self.product = product or CPEAttribute(any=True)
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201 self.version = version or CPEAttribute(any=True)
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202 self.update = update or CPEAttribute(any=True)
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203 self.edition = edition or CPEAttribute(any=True)
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204 self.language = language or CPEAttribute(any=True)
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205 # Extended attributes:
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206 self.sw_edition = sw_edition or CPEAttribute(any=True)
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207 self.target_sw = target_sw or CPEAttribute(any=True)
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208 self.target_hw = target_hw or CPEAttribute(any=True)
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209 self.other = other or CPEAttribute(any=True)
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210
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211 def bind_to_URI(self):
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212 uri = 'cpe:/'
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213 uri += ':'.join(a.bind_for_URI() for a in (self.part, self.vendor, self.product, self.version, self.update))
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214 # Special handling for edition
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215 ed = self.edition.bind_for_URI()
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216 sw_ed = self.sw_edition.bind_for_URI()
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217 t_sw = self.target_sw.bind_for_URI()
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218 t_hw = self.target_hw.bind_for_URI()
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219 oth = self.other.bind_for_URI()
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220 if sw_ed == "" and t_sw == "" and t_hw == "" and oth == "":
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221 uri += ":" + ed
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222 else:
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223 uri += ":~" + '~'.join([ed, sw_ed, t_sw, t_hw, oth])
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224 uri += ':' + self.language.bind_for_URI()
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225 return uri.rstrip(':')
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226
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227 def unbind_URI(self, uri):
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228 for idx, comp in enumerate(uri.split(':')):
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229 if idx == 0:
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230 continue
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231 elif idx == 1:
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232 self.part = decode(comp[1:])
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233 elif idx == 2:
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234 self.vendor = decode(comp)
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235 elif idx == 3:
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236 self.product = decode(comp)
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237 elif idx == 4:
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238 self.version = decode(comp)
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239 elif idx == 5:
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240 self.update = decode(comp)
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241 elif idx == 6:
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242 if comp == "" or comp[0] != '~':
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243 self.edition = decode(comp)
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244 else:
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245 ed, sw_ed, t_sw, t_hw, oth = comp[1:].split('~')
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246 self.edition = decode(ed)
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247 self.sw_edition = decode(sw_ed)
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248 self.target_sw = decode(t_sw)
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249 self.target_hw = decode(t_hw)
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250 self.other = decode(oth)
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251 elif idx == 7:
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252 self.language = decode(comp)
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253
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254 def bind_to_fs(self):
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255 fs = 'cpe:2.3:'
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256 fs += ':'.join(a.bind_for_fs() for a in (self.part, self.vendor, self.product, self.version, self.update, self.edition, self.language, self.sw_edition, self.target_sw, self.target_hw, self.other))
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257 return fs
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258
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259 def unbind_fs(self, fs):
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260 for idx, v in enumerate(fs.split(':')):
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261 v = unbind_value_fs(v)
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262 if idx == 2:
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263 self.part = v
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264 elif idx == 3:
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265 self.vendor = v
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266 elif idx == 4:
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267 self.product = v
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268 elif idx == 5:
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269 self.version = v
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270 elif idx == 6:
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271 self.update = v
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272 elif idx == 7:
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273 self.edition = v
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274 elif idx == 8:
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275 self.language = v
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276 elif idx == 9:
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277 self.sw_edition = v
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278 elif idx == 10:
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279 self.target_sw = v
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280 elif idx == 11:
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281 self.target_hw = v
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282 elif idx == 12:
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283 self.other = v
41
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284
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285 def parse(s):
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286 cpe = CPE()
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287 if s[:5] == 'cpe:/':
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288 cpe.unbind_URI(s)
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289 elif s[:8] == 'cpe:2.3:':
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290 cpe.unbind_fs(s)
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291 else:
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292 raise ValueError(s)
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293 return cpe
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