Mercurial > cpython-lru_cache-weakref

annotate Lib/robotparser.py @ 49955:878d40468c4e legacy-trunk

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Issue #4384: Added logging integration with warnings module using captureWarnings(). This change includes a NullHandler which does nothing; it will be of use to library developers who want to avoid the "No handlers could be found for logger XXX" message which can appear if the library user doesn't configure logging.
author Vinay Sajip <vinay_sajip@yahoo.co.uk>
date Wed, 03 Dec 2008 23:22:58 +0000
parents 9f9e5fe63ec2
children 2c253f6e02e7 0bb47c51e933
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 """ robotparser.py
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2
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3 Copyright (C) 2000 Bastian Kleineidam
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4
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5 You can choose between two licenses when using this package:
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6 1) GNU GPLv2
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7 2) PSF license for Python 2.2
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8
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9 The robots.txt Exclusion Protocol is implemented as specified in
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10 http://info.webcrawler.com/mak/projects/robots/norobots-rfc.html
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11 """
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12 import urlparse
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13 import urllib
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14
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15 __all__ = ["RobotFileParser"]
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16
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17
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18 class RobotFileParser:
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19 """ This class provides a set of methods to read, parse and answer
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20 questions about a single robots.txt file.
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21
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22 """
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23
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24 def __init__(self, url=''):
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25 self.entries = []
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26 self.default_entry = None
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27 self.disallow_all = False
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28 self.allow_all = False
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29 self.set_url(url)
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30 self.last_checked = 0
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31
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32 def mtime(self):
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33 """Returns the time the robots.txt file was last fetched.
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34
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35 This is useful for long-running web spiders that need to
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36 check for new robots.txt files periodically.
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37
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38 """
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39 return self.last_checked
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41 def modified(self):
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42 """Sets the time the robots.txt file was last fetched to the
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43 current time.
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44
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45 """
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46 import time
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47 self.last_checked = time.time()
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48
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49 def set_url(self, url):
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50 """Sets the URL referring to a robots.txt file."""
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51 self.url = url
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52 self.host, self.path = urlparse.urlparse(url)[1:3]
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53
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54 def read(self):
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55 """Reads the robots.txt URL and feeds it to the parser."""
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56 opener = URLopener()
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57 f = opener.open(self.url)
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58 lines = [line.strip() for line in f]
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59 f.close()
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60 self.errcode = opener.errcode
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61 if self.errcode in (401, 403):
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62 self.disallow_all = True
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63 elif self.errcode >= 400:
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64 self.allow_all = True
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65 elif self.errcode == 200 and lines:
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66 self.parse(lines)
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67
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68 def _add_entry(self, entry):
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69 if "*" in entry.useragents:
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70 # the default entry is considered last
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71 self.default_entry = entry
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72 else:
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73 self.entries.append(entry)
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74
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75 def parse(self, lines):
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76 """parse the input lines from a robots.txt file.
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77 We allow that a user-agent: line is not preceded by
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78 one or more blank lines."""
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79 # states:
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80 # 0: start state
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81 # 1: saw user-agent line
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82 # 2: saw an allow or disallow line
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83 state = 0
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84 linenumber = 0
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85 entry = Entry()
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86
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87 for line in lines:
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88 linenumber += 1
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89 if not line:
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90 if state == 1:
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91 entry = Entry()
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92 state = 0
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93 elif state == 2:
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94 self._add_entry(entry)
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95 entry = Entry()
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96 state = 0
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97 # remove optional comment and strip line
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98 i = line.find('#')
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99 if i >= 0:
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100 line = line[:i]
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101 line = line.strip()
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102 if not line:
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103 continue
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104 line = line.split(':', 1)
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105 if len(line) == 2:
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106 line[0] = line[0].strip().lower()
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107 line[1] = urllib.unquote(line[1].strip())
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108 if line[0] == "user-agent":
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109 if state == 2:
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110 self._add_entry(entry)
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111 entry = Entry()
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112 entry.useragents.append(line[1])
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113 state = 1
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114 elif line[0] == "disallow":
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115 if state != 0:
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116 entry.rulelines.append(RuleLine(line[1], False))
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117 state = 2
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118 elif line[0] == "allow":
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119 if state != 0:
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120 entry.rulelines.append(RuleLine(line[1], True))
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121 state = 2
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122 if state == 2:
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123 self.entries.append(entry)
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124
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125
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126 def can_fetch(self, useragent, url):
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Guido van Rossum <guido@python.org>
parents: 7887
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127 """using the parsed robots.txt decide if useragent can fetch url"""
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parents: 12062
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128 if self.disallow_all:
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Tim Peters <tim.peters@gmail.com>
parents: 22371
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129 return False
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parents: 12062
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130 if self.allow_all:
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Tim Peters <tim.peters@gmail.com>
parents: 22371
diff changeset
131 return True
16067
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parents: 12062
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132 # search for given user agent matches
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parents: 12062
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133 # the first match counts
22088
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Martin v. Löwis <martin@v.loewis.de>
parents: 19213
diff changeset
134 url = urllib.quote(urlparse.urlparse(urllib.unquote(url))[2]) or "/"
16067
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parents: 12062
diff changeset
135 for entry in self.entries:
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parents: 12062
diff changeset
136 if entry.applies_to(useragent):
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Skip Montanaro <skip@pobox.com>
parents: 12062
diff changeset
137 return entry.allowance(url)
22088
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Martin v. Löwis <martin@v.loewis.de>
parents: 19213
diff changeset
138 # try the default entry last
736fb5aec9b3 Correct various errors:
Martin v. Löwis <martin@v.loewis.de>
parents: 19213
diff changeset
139 if self.default_entry:
736fb5aec9b3 Correct various errors:
Martin v. Löwis <martin@v.loewis.de>
parents: 19213
diff changeset
140 return self.default_entry.allowance(url)
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Skip Montanaro <skip@pobox.com>
parents: 12062
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141 # agent not found ==> access granted
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Tim Peters <tim.peters@gmail.com>
parents: 22371
diff changeset
142 return True
5063
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Guido van Rossum <guido@python.org>
parents:
diff changeset
143
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Skip Montanaro <skip@pobox.com>
parents: 12062
diff changeset
144
fe36ab4b3e97 rewrite of robotparser.py by Bastian Kleineidam. Closes patch 102229.
Skip Montanaro <skip@pobox.com>
parents: 12062
diff changeset
145 def __str__(self):
41146
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Georg Brandl <georg@python.org>
parents: 33240
diff changeset
146 return ''.join([str(entry) + "\n" for entry in self.entries])
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Skip Montanaro <skip@pobox.com>
parents: 12062
diff changeset
147
fe36ab4b3e97 rewrite of robotparser.py by Bastian Kleineidam. Closes patch 102229.
Skip Montanaro <skip@pobox.com>
parents: 12062
diff changeset
148
fe36ab4b3e97 rewrite of robotparser.py by Bastian Kleineidam. Closes patch 102229.
Skip Montanaro <skip@pobox.com>
parents: 12062
diff changeset
149 class RuleLine:
33240
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Martin v. Löwis <martin@v.loewis.de>
parents: 31967
diff changeset
150 """A rule line is a single "Allow:" (allowance==True) or "Disallow:"
71427915796e Patch #1014237: Consistently return booleans throughout.
Martin v. Löwis <martin@v.loewis.de>
parents: 31967
diff changeset
151 (allowance==False) followed by a path."""
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Skip Montanaro <skip@pobox.com>
parents: 12062
diff changeset
152 def __init__(self, path, allowance):
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Martin v. Löwis <martin@v.loewis.de>
parents: 19213
diff changeset
153 if path == '' and not allowance:
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Martin v. Löwis <martin@v.loewis.de>
parents: 19213
diff changeset
154 # an empty value means allow all
33240
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Martin v. Löwis <martin@v.loewis.de>
parents: 31967
diff changeset
155 allowance = True
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parents: 12062
diff changeset
156 self.path = urllib.quote(path)
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Skip Montanaro <skip@pobox.com>
parents: 12062
diff changeset
157 self.allowance = allowance
fe36ab4b3e97 rewrite of robotparser.py by Bastian Kleineidam. Closes patch 102229.
Skip Montanaro <skip@pobox.com>
parents: 12062
diff changeset
158
fe36ab4b3e97 rewrite of robotparser.py by Bastian Kleineidam. Closes patch 102229.
Skip Montanaro <skip@pobox.com>
parents: 12062
diff changeset
159 def applies_to(self, filename):
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Skip Montanaro <skip@pobox.com>
parents: 42956
diff changeset
160 return self.path == "*" or filename.startswith(self.path)
16067
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Skip Montanaro <skip@pobox.com>
parents: 12062
diff changeset
161
fe36ab4b3e97 rewrite of robotparser.py by Bastian Kleineidam. Closes patch 102229.
Skip Montanaro <skip@pobox.com>
parents: 12062
diff changeset
162 def __str__(self):
46591
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Skip Montanaro <skip@pobox.com>
parents: 42956
diff changeset
163 return (self.allowance and "Allow" or "Disallow") + ": " + self.path
16067
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Skip Montanaro <skip@pobox.com>
parents: 12062
diff changeset
164
fe36ab4b3e97 rewrite of robotparser.py by Bastian Kleineidam. Closes patch 102229.
Skip Montanaro <skip@pobox.com>
parents: 12062
diff changeset
165
fe36ab4b3e97 rewrite of robotparser.py by Bastian Kleineidam. Closes patch 102229.
Skip Montanaro <skip@pobox.com>
parents: 12062
diff changeset
166 class Entry:
fe36ab4b3e97 rewrite of robotparser.py by Bastian Kleineidam. Closes patch 102229.
Skip Montanaro <skip@pobox.com>
parents: 12062
diff changeset
167 """An entry has one or more user-agents and zero or more rulelines"""
fe36ab4b3e97 rewrite of robotparser.py by Bastian Kleineidam. Closes patch 102229.
Skip Montanaro <skip@pobox.com>
parents: 12062
diff changeset
168 def __init__(self):
fe36ab4b3e97 rewrite of robotparser.py by Bastian Kleineidam. Closes patch 102229.
Skip Montanaro <skip@pobox.com>
parents: 12062
diff changeset
169 self.useragents = []
fe36ab4b3e97 rewrite of robotparser.py by Bastian Kleineidam. Closes patch 102229.
Skip Montanaro <skip@pobox.com>
parents: 12062
diff changeset
170 self.rulelines = []
fe36ab4b3e97 rewrite of robotparser.py by Bastian Kleineidam. Closes patch 102229.
Skip Montanaro <skip@pobox.com>
parents: 12062
diff changeset
171
fe36ab4b3e97 rewrite of robotparser.py by Bastian Kleineidam. Closes patch 102229.
Skip Montanaro <skip@pobox.com>
parents: 12062
diff changeset
172 def __str__(self):
41146
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Georg Brandl <georg@python.org>
parents: 33240
diff changeset
173 ret = []
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Skip Montanaro <skip@pobox.com>
parents: 12062
diff changeset
174 for agent in self.useragents:
41146
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Georg Brandl <georg@python.org>
parents: 33240
diff changeset
175 ret.extend(["User-agent: ", agent, "\n"])
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Skip Montanaro <skip@pobox.com>
parents: 12062
diff changeset
176 for line in self.rulelines:
41146
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Georg Brandl <georg@python.org>
parents: 33240
diff changeset
177 ret.extend([str(line), "\n"])
8fa4e980b589 Patch #1555098: use str.join() instead of repeated string
Georg Brandl <georg@python.org>
parents: 33240
diff changeset
178 return ''.join(ret)
16067
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Skip Montanaro <skip@pobox.com>
parents: 12062
diff changeset
179
fe36ab4b3e97 rewrite of robotparser.py by Bastian Kleineidam. Closes patch 102229.
Skip Montanaro <skip@pobox.com>
parents: 12062
diff changeset
180 def applies_to(self, useragent):
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Skip Montanaro <skip@pobox.com>
parents: 16494
diff changeset
181 """check if this entry applies to the specified agent"""
a63dc59be0f9 The bulk of the credit for these changes goes to Bastian Kleineidam
Skip Montanaro <skip@pobox.com>
parents: 16494
diff changeset
182 # split the name token and make it lower case
a63dc59be0f9 The bulk of the credit for these changes goes to Bastian Kleineidam
Skip Montanaro <skip@pobox.com>
parents: 16494
diff changeset
183 useragent = useragent.split("/")[0].lower()
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Skip Montanaro <skip@pobox.com>
parents: 12062
diff changeset
184 for agent in self.useragents:
46591
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Skip Montanaro <skip@pobox.com>
parents: 42956
diff changeset
185 if agent == '*':
16579
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Skip Montanaro <skip@pobox.com>
parents: 16494
diff changeset
186 # we have the catch-all agent
22830
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Tim Peters <tim.peters@gmail.com>
parents: 22371
diff changeset
187 return True
16579
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Skip Montanaro <skip@pobox.com>
parents: 16494
diff changeset
188 agent = agent.lower()
31967
3d046d063a84 Replace str.find()!=1 with the more readable "in" operator.
Raymond Hettinger <python@rcn.com>
parents: 31653
diff changeset
189 if agent in useragent:
22830
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Tim Peters <tim.peters@gmail.com>
parents: 22371
diff changeset
190 return True
a9dd5e6d6805 Convert a pile of obvious "yes/no" functions to return bool.
Tim Peters <tim.peters@gmail.com>
parents: 22371
diff changeset
191 return False
16067
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Skip Montanaro <skip@pobox.com>
parents: 12062
diff changeset
192
fe36ab4b3e97 rewrite of robotparser.py by Bastian Kleineidam. Closes patch 102229.
Skip Montanaro <skip@pobox.com>
parents: 12062
diff changeset
193 def allowance(self, filename):
fe36ab4b3e97 rewrite of robotparser.py by Bastian Kleineidam. Closes patch 102229.
Skip Montanaro <skip@pobox.com>
parents: 12062
diff changeset
194 """Preconditions:
fe36ab4b3e97 rewrite of robotparser.py by Bastian Kleineidam. Closes patch 102229.
Skip Montanaro <skip@pobox.com>
parents: 12062
diff changeset
195 - our agent applies to this entry
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Skip Montanaro <skip@pobox.com>
parents: 12062
diff changeset
196 - filename is URL decoded"""
fe36ab4b3e97 rewrite of robotparser.py by Bastian Kleineidam. Closes patch 102229.
Skip Montanaro <skip@pobox.com>
parents: 12062
diff changeset
197 for line in self.rulelines:
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Skip Montanaro <skip@pobox.com>
parents: 12062
diff changeset
198 if line.applies_to(filename):
fe36ab4b3e97 rewrite of robotparser.py by Bastian Kleineidam. Closes patch 102229.
Skip Montanaro <skip@pobox.com>
parents: 12062
diff changeset
199 return line.allowance
33240
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Martin v. Löwis <martin@v.loewis.de>
parents: 31967
diff changeset
200 return True
16067
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Skip Montanaro <skip@pobox.com>
parents: 12062
diff changeset
201
16579
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Skip Montanaro <skip@pobox.com>
parents: 16494
diff changeset
202 class URLopener(urllib.FancyURLopener):
a63dc59be0f9 The bulk of the credit for these changes goes to Bastian Kleineidam
Skip Montanaro <skip@pobox.com>
parents: 16494
diff changeset
203 def __init__(self, *args):
28089
14f65d661084 Get rid of many apply() calls.
Guido van Rossum <guido@python.org>
parents: 23591
diff changeset
204 urllib.FancyURLopener.__init__(self, *args)
16579
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Skip Montanaro <skip@pobox.com>
parents: 16494
diff changeset
205 self.errcode = 200
16616
e2a63584566f Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 16579
diff changeset
206
42956
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Skip Montanaro <skip@pobox.com>
parents: 41146
diff changeset
207 def prompt_user_passwd(self, host, realm):
e6a9fcd1b44e fixes 813986
Skip Montanaro <skip@pobox.com>
parents: 41146
diff changeset
208 ## If robots.txt file is accessible only with a password,
e6a9fcd1b44e fixes 813986
Skip Montanaro <skip@pobox.com>
parents: 41146
diff changeset
209 ## we act as if the file wasn't there.
e6a9fcd1b44e fixes 813986
Skip Montanaro <skip@pobox.com>
parents: 41146
diff changeset
210 return None, None
e6a9fcd1b44e fixes 813986
Skip Montanaro <skip@pobox.com>
parents: 41146
diff changeset
211
16579
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Skip Montanaro <skip@pobox.com>
parents: 16494
diff changeset
212 def http_error_default(self, url, fp, errcode, errmsg, headers):
a63dc59be0f9 The bulk of the credit for these changes goes to Bastian Kleineidam
Skip Montanaro <skip@pobox.com>
parents: 16494
diff changeset
213 self.errcode = errcode
a63dc59be0f9 The bulk of the credit for these changes goes to Bastian Kleineidam
Skip Montanaro <skip@pobox.com>
parents: 16494
diff changeset
214 return urllib.FancyURLopener.http_error_default(self, url, fp, errcode,
a63dc59be0f9 The bulk of the credit for these changes goes to Bastian Kleineidam
Skip Montanaro <skip@pobox.com>
parents: 16494
diff changeset
215 errmsg, headers)