Mercurial > repos > guerler > springsuite

annotate planemo/lib/python3.7/site-packages/future/backports/urllib/robotparser.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 from __future__ import absolute_import, division, unicode_literals
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2 from future.builtins import str
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3 """ robotparser.py
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4
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5 Copyright (C) 2000 Bastian Kleineidam
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6
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7 You can choose between two licenses when using this package:
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8 1) GNU GPLv2
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9 2) PSF license for Python 2.2
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10
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11 The robots.txt Exclusion Protocol is implemented as specified in
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12 http://info.webcrawler.com/mak/projects/robots/norobots-rfc.html
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13 """
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14
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15 # Was: import urllib.parse, urllib.request
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16 from future.backports import urllib
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17 from future.backports.urllib import parse as _parse, request as _request
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18 urllib.parse = _parse
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19 urllib.request = _request
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20
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21
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22 __all__ = ["RobotFileParser"]
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23
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24 class RobotFileParser(object):
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25 """ This class provides a set of methods to read, parse and answer
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26 questions about a single robots.txt file.
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27
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28 """
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29
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30 def __init__(self, url=''):
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31 self.entries = []
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32 self.default_entry = None
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33 self.disallow_all = False
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34 self.allow_all = False
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35 self.set_url(url)
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36 self.last_checked = 0
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37
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38 def mtime(self):
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39 """Returns the time the robots.txt file was last fetched.
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40
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41 This is useful for long-running web spiders that need to
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42 check for new robots.txt files periodically.
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43
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44 """
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45 return self.last_checked
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46
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47 def modified(self):
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48 """Sets the time the robots.txt file was last fetched to the
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49 current time.
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50
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51 """
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52 import time
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53 self.last_checked = time.time()
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54
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55 def set_url(self, url):
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56 """Sets the URL referring to a robots.txt file."""
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57 self.url = url
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58 self.host, self.path = urllib.parse.urlparse(url)[1:3]
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59
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60 def read(self):
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61 """Reads the robots.txt URL and feeds it to the parser."""
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62 try:
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63 f = urllib.request.urlopen(self.url)
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64 except urllib.error.HTTPError as err:
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65 if err.code in (401, 403):
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66 self.disallow_all = True
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67 elif err.code >= 400:
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68 self.allow_all = True
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69 else:
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70 raw = f.read()
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71 self.parse(raw.decode("utf-8").splitlines())
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72
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73 def _add_entry(self, entry):
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74 if "*" in entry.useragents:
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75 # the default entry is considered last
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76 if self.default_entry is None:
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77 # the first default entry wins
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78 self.default_entry = entry
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79 else:
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80 self.entries.append(entry)
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81
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82 def parse(self, lines):
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83 """Parse the input lines from a robots.txt file.
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84
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85 We allow that a user-agent: line is not preceded by
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86 one or more blank lines.
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87 """
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88 # states:
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89 # 0: start state
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90 # 1: saw user-agent line
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91 # 2: saw an allow or disallow line
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92 state = 0
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93 entry = Entry()
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94
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95 for line in lines:
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96 if not line:
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97 if state == 1:
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98 entry = Entry()
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99 state = 0
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100 elif state == 2:
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101 self._add_entry(entry)
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102 entry = Entry()
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103 state = 0
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104 # remove optional comment and strip line
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105 i = line.find('#')
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106 if i >= 0:
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107 line = line[:i]
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108 line = line.strip()
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109 if not line:
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110 continue
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111 line = line.split(':', 1)
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112 if len(line) == 2:
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113 line[0] = line[0].strip().lower()
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114 line[1] = urllib.parse.unquote(line[1].strip())
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115 if line[0] == "user-agent":
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116 if state == 2:
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117 self._add_entry(entry)
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118 entry = Entry()
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119 entry.useragents.append(line[1])
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120 state = 1
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121 elif line[0] == "disallow":
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122 if state != 0:
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123 entry.rulelines.append(RuleLine(line[1], False))
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124 state = 2
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125 elif line[0] == "allow":
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126 if state != 0:
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127 entry.rulelines.append(RuleLine(line[1], True))
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128 state = 2
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129 if state == 2:
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130 self._add_entry(entry)
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131
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132
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133 def can_fetch(self, useragent, url):
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134 """using the parsed robots.txt decide if useragent can fetch url"""
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135 if self.disallow_all:
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136 return False
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137 if self.allow_all:
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138 return True
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139 # search for given user agent matches
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140 # the first match counts
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141 parsed_url = urllib.parse.urlparse(urllib.parse.unquote(url))
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142 url = urllib.parse.urlunparse(('','',parsed_url.path,
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143 parsed_url.params,parsed_url.query, parsed_url.fragment))
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144 url = urllib.parse.quote(url)
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145 if not url:
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146 url = "/"
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147 for entry in self.entries:
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148 if entry.applies_to(useragent):
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149 return entry.allowance(url)
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150 # try the default entry last
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151 if self.default_entry:
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152 return self.default_entry.allowance(url)
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153 # agent not found ==> access granted
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154 return True
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155
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156 def __str__(self):
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157 return ''.join([str(entry) + "\n" for entry in self.entries])
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158
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159
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160 class RuleLine(object):
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161 """A rule line is a single "Allow:" (allowance==True) or "Disallow:"
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162 (allowance==False) followed by a path."""
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163 def __init__(self, path, allowance):
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164 if path == '' and not allowance:
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165 # an empty value means allow all
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166 allowance = True
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167 self.path = urllib.parse.quote(path)
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168 self.allowance = allowance
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169
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170 def applies_to(self, filename):
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171 return self.path == "*" or filename.startswith(self.path)
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172
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173 def __str__(self):
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174 return (self.allowance and "Allow" or "Disallow") + ": " + self.path
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175
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176
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177 class Entry(object):
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178 """An entry has one or more user-agents and zero or more rulelines"""
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179 def __init__(self):
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180 self.useragents = []
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181 self.rulelines = []
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182
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183 def __str__(self):
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184 ret = []
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185 for agent in self.useragents:
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186 ret.extend(["User-agent: ", agent, "\n"])
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187 for line in self.rulelines:
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188 ret.extend([str(line), "\n"])
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189 return ''.join(ret)
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190
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191 def applies_to(self, useragent):
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192 """check if this entry applies to the specified agent"""
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193 # split the name token and make it lower case
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194 useragent = useragent.split("/")[0].lower()
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195 for agent in self.useragents:
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196 if agent == '*':
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197 # we have the catch-all agent
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198 return True
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199 agent = agent.lower()
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200 if agent in useragent:
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201 return True
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202 return False
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203
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204 def allowance(self, filename):
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205 """Preconditions:
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206 - our agent applies to this entry
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207 - filename is URL decoded"""
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208 for line in self.rulelines:
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209 if line.applies_to(filename):
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210 return line.allowance
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211 return True