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# monkeypatch.py - add missing functionality to standard modules
#
# Copyright (C) 2011 Arthur de Jong
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
#
# The files produced as output from the software do not automatically fall
# under the copyright of the software, unless explicitly stated otherwise.
import re
import sys
import urllib
import urlparse
__all__ = []
# This monkeypatches RuleLine.applies_to to support * and $ characters in
# robots.txt path names.
def my_applies_to(ruleline, filename):
if not hasattr(ruleline, 'pattern'):
pat = []
# we need to unescape the * from the path here
for x in ruleline.path.replace('%2A', '*'):
if x == '*':
pat.append('.*')
elif x == '$':
pat.append(r'\Z')
else:
pat.append(re.escape(x))
ruleline.pattern = re.compile(''.join(pat) + '(?ms)')
return bool(ruleline.pattern.match(filename))
from robotparser import RuleLine
RuleLine.applies_to = my_applies_to
# This monkeypatches RobotFileParser.can_fetch to include the query string
# into the tested part of the URL, taken from http://bugs.python.org/issue6325
# this should be fixed in Python 2.7
if sys.version_info < (2, 7):
def my_can_fetch(rfp, useragent, url):
"""using the parsed robots.txt decide if useragent can fetch url"""
if rfp.disallow_all:
return False
if rfp.allow_all:
return True
# search for given user agent matches
# the first match counts
parsed_url = urlparse.urlparse(urllib.unquote(url))
url = urlparse.urlunparse(('', '', parsed_url.path,
parsed_url.params, parsed_url.query, parsed_url.fragment))
url = urllib.quote(url)
if not url:
url = "/"
for entry in rfp.entries:
if entry.applies_to(useragent):
return entry.allowance(url)
# try the default entry last
if rfp.default_entry:
return rfp.default_entry.allowance(url)
# agent not found ==> access granted
return True
from robotparser import RobotFileParser
RobotFileParser.can_fetch = my_can_fetch
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