Mercurial > cpython-lru_cache-weakref
annotate Lib/robotparser.py @ 13163:a09e8635534d legacy-trunk
Don't try to guess the name of a .def file -- if one is supplied, use it,
otherwise just generate an '/export:' option.
| author | Greg Ward <gward@python.net> |
|---|---|
| date | Thu, 29 Jun 2000 23:09:20 +0000 |
| parents | c43b38079228 |
| children | fe36ab4b3e97 |
| rev | line source |
|---|---|
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Skip Montanaro's robots.txt parser.
Guido van Rossum <guido@python.org>
parents:
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1 """ |
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2 |
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3 Robots.txt file parser class. Accepts a list of lines or robots.txt URL as |
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f0731fa4447f
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4 input, builds a set of rules from that list, then answers questions about |
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Guido van Rossum <guido@python.org>
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5 fetchability of other URLs. |
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6 |
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Guido van Rossum <guido@python.org>
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7 """ |
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8 |
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9 class RobotFileParser: |
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10 |
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11 def __init__(self): |
| 7887 | 12 self.rules = {} |
| 13 self.debug = 0 | |
| 14 self.url = '' | |
| 15 self.last_checked = 0 | |
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16 |
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17 def mtime(self): |
| 7887 | 18 return self.last_checked |
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19 |
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20 def modified(self): |
| 7887 | 21 import time |
| 22 self.last_checked = time.time() | |
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23 |
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24 def set_url(self, url): |
| 7887 | 25 self.url = url |
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26 |
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27 def read(self): |
| 7887 | 28 import urllib |
| 29 self.parse(urllib.urlopen(self.url).readlines()) | |
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30 |
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31 def parse(self, lines): |
| 12062 | 32 """parse the input lines from a robot.txt file""" |
| 33 import string, re | |
| 7887 | 34 active = [] |
| 35 for line in lines: | |
| 36 if self.debug: print '>', line, | |
| 37 # blank line terminates current record | |
| 38 if not line[:-1]: | |
| 39 active = [] | |
| 40 continue | |
| 41 # remove optional comment and strip line | |
| 42 line = string.strip(line[:string.find(line, '#')]) | |
| 43 if not line: | |
| 44 continue | |
| 12062 | 45 line = re.split(' *: *', line) |
| 7887 | 46 if len(line) == 2: |
| 47 line[0] = string.lower(line[0]) | |
| 48 if line[0] == 'user-agent': | |
| 49 # this record applies to this user agent | |
| 50 if self.debug: print '>> user-agent:', line[1] | |
| 51 active.append(line[1]) | |
| 52 if not self.rules.has_key(line[1]): | |
| 53 self.rules[line[1]] = [] | |
| 54 elif line[0] == 'disallow': | |
| 55 if line[1]: | |
| 56 if self.debug: print '>> disallow:', line[1] | |
| 57 for agent in active: | |
| 12062 | 58 self.rules[agent].append(re.compile(line[1])) |
| 7887 | 59 else: |
| 60 pass | |
| 61 for agent in active: | |
| 62 if self.debug: print '>> allow', agent | |
| 63 self.rules[agent] = [] | |
| 64 else: | |
| 65 if self.debug: print '>> unknown:', line | |
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66 |
| 7887 | 67 self.modified() |
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68 |
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69 # returns true if agent is allowed to fetch url |
| 12062 | 70 def can_fetch(self, useragent, url): |
| 71 """using the parsed robots.txt decide if useragent can fetch url""" | |
| 7887 | 72 import urlparse |
| 12062 | 73 ag = useragent |
| 7887 | 74 if not self.rules.has_key(ag): ag = '*' |
| 75 if not self.rules.has_key(ag): | |
| 12062 | 76 if self.debug: print '>> allowing', url, 'fetch by', useragent |
| 7887 | 77 return 1 |
| 78 path = urlparse.urlparse(url)[2] | |
| 79 for rule in self.rules[ag]: | |
| 12062 | 80 if rule.match(path) is not None: |
| 81 if self.debug: print '>> disallowing', url, 'fetch by', useragent | |
| 7887 | 82 return 0 |
| 12062 | 83 if self.debug: print '>> allowing', url, 'fetch by', useragent |
| 7887 | 84 return 1 |
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85 |
| 12062 | 86 def _test(): |
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87 rp = RobotFileParser() |
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88 rp.debug = 1 |
| 12062 | 89 rp.set_url('http://www.musi-cal.com/robots.txt') |
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90 rp.read() |
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91 print rp.rules |
| 12062 | 92 print rp.can_fetch('*', 'http://www.musi-cal.com.com/') |
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93 print rp.can_fetch('Musi-Cal-Robot', |
| 12062 | 94 'http://www.musi-cal.com/cgi-bin/event-search?city=San+Francisco') |
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95 |
| 12062 | 96 if __name__ == "__main__": |
| 97 _test() |