author | jjkang |
Fri, 11 Jun 2010 15:22:40 +0800 | |
changeset 2 | 9da1e5517a66 |
parent 0 | ae805ac0140d |
permissions | -rw-r--r-- |
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""" robotparser.py |
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Copyright (C) 2000 Bastian Kleineidam |
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|
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You can choose between two licenses when using this package: |
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1) GNU GPLv2 |
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2) PSF license for Python 2.2 |
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|
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The robots.txt Exclusion Protocol is implemented as specified in |
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http://info.webcrawler.com/mak/projects/robots/norobots-rfc.html |
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""" |
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import urlparse,urllib |
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|
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__all__ = ["RobotFileParser"] |
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debug = 0 |
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def _debug(msg): |
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if debug: print msg |
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class RobotFileParser: |
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""" This class provides a set of methods to read, parse and answer |
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questions about a single robots.txt file. |
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""" |
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def __init__(self, url=''): |
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self.entries = [] |
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self.default_entry = None |
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self.disallow_all = False |
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self.allow_all = False |
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self.set_url(url) |
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self.last_checked = 0 |
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def mtime(self): |
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"""Returns the time the robots.txt file was last fetched. |
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This is useful for long-running web spiders that need to |
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check for new robots.txt files periodically. |
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""" |
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return self.last_checked |
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def modified(self): |
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"""Sets the time the robots.txt file was last fetched to the |
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current time. |
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""" |
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import time |
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self.last_checked = time.time() |
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def set_url(self, url): |
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"""Sets the URL referring to a robots.txt file.""" |
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self.url = url |
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self.host, self.path = urlparse.urlparse(url)[1:3] |
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def read(self): |
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"""Reads the robots.txt URL and feeds it to the parser.""" |
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opener = URLopener() |
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f = opener.open(self.url) |
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lines = [] |
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line = f.readline() |
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while line: |
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lines.append(line.strip()) |
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line = f.readline() |
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self.errcode = opener.errcode |
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if self.errcode == 401 or self.errcode == 403: |
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self.disallow_all = True |
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_debug("disallow all") |
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elif self.errcode >= 400: |
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self.allow_all = True |
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_debug("allow all") |
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elif self.errcode == 200 and lines: |
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_debug("parse lines") |
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self.parse(lines) |
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def _add_entry(self, entry): |
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if "*" in entry.useragents: |
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# the default entry is considered last |
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self.default_entry = entry |
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else: |
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self.entries.append(entry) |
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def parse(self, lines): |
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"""parse the input lines from a robots.txt file. |
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We allow that a user-agent: line is not preceded by |
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one or more blank lines.""" |
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state = 0 |
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linenumber = 0 |
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entry = Entry() |
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for line in lines: |
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linenumber = linenumber + 1 |
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if not line: |
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if state==1: |
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_debug("line %d: warning: you should insert" |
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" allow: or disallow: directives below any" |
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" user-agent: line" % linenumber) |
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entry = Entry() |
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state = 0 |
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elif state==2: |
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self._add_entry(entry) |
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entry = Entry() |
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state = 0 |
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# remove optional comment and strip line |
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i = line.find('#') |
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if i>=0: |
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line = line[:i] |
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line = line.strip() |
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if not line: |
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continue |
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line = line.split(':', 1) |
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if len(line) == 2: |
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line[0] = line[0].strip().lower() |
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line[1] = urllib.unquote(line[1].strip()) |
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if line[0] == "user-agent": |
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if state==2: |
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_debug("line %d: warning: you should insert a blank" |
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" line before any user-agent" |
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" directive" % linenumber) |
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self._add_entry(entry) |
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entry = Entry() |
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entry.useragents.append(line[1]) |
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state = 1 |
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126 |
elif line[0] == "disallow": |
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127 |
if state==0: |
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128 |
_debug("line %d: error: you must insert a user-agent:" |
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129 |
" directive before this line" % linenumber) |
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130 |
else: |
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131 |
entry.rulelines.append(RuleLine(line[1], False)) |
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132 |
state = 2 |
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133 |
elif line[0] == "allow": |
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134 |
if state==0: |
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135 |
_debug("line %d: error: you must insert a user-agent:" |
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136 |
" directive before this line" % linenumber) |
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137 |
else: |
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138 |
entry.rulelines.append(RuleLine(line[1], True)) |
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139 |
else: |
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|
140 |
_debug("line %d: warning: unknown key %s" % (linenumber, |
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|
141 |
line[0])) |
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142 |
else: |
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|
143 |
_debug("line %d: error: malformed line %s"%(linenumber, line)) |
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|
144 |
if state==2: |
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145 |
self.entries.append(entry) |
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146 |
_debug("Parsed rules:\n%s" % str(self)) |
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147 |
|
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148 |
|
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149 |
def can_fetch(self, useragent, url): |
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150 |
"""using the parsed robots.txt decide if useragent can fetch url""" |
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151 |
_debug("Checking robots.txt allowance for:\n user agent: %s\n url: %s" % |
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152 |
(useragent, url)) |
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153 |
if self.disallow_all: |
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154 |
return False |
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155 |
if self.allow_all: |
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156 |
return True |
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157 |
# search for given user agent matches |
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158 |
# the first match counts |
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159 |
url = urllib.quote(urlparse.urlparse(urllib.unquote(url))[2]) or "/" |
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160 |
for entry in self.entries: |
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161 |
if entry.applies_to(useragent): |
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162 |
return entry.allowance(url) |
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163 |
# try the default entry last |
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164 |
if self.default_entry: |
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165 |
return self.default_entry.allowance(url) |
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166 |
# agent not found ==> access granted |
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167 |
return True |
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|
168 |
|
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169 |
|
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170 |
def __str__(self): |
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171 |
ret = "" |
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172 |
for entry in self.entries: |
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173 |
ret = ret + str(entry) + "\n" |
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174 |
return ret |
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175 |
|
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|
176 |
|
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|
177 |
class RuleLine: |
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178 |
"""A rule line is a single "Allow:" (allowance==True) or "Disallow:" |
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179 |
(allowance==False) followed by a path.""" |
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180 |
def __init__(self, path, allowance): |
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181 |
if path == '' and not allowance: |
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182 |
# an empty value means allow all |
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183 |
allowance = True |
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184 |
self.path = urllib.quote(path) |
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185 |
self.allowance = allowance |
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186 |
|
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187 |
def applies_to(self, filename): |
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188 |
return self.path=="*" or filename.startswith(self.path) |
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|
189 |
|
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|
190 |
def __str__(self): |
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|
191 |
return (self.allowance and "Allow" or "Disallow")+": "+self.path |
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|
192 |
|
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|
193 |
|
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|
194 |
class Entry: |
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|
195 |
"""An entry has one or more user-agents and zero or more rulelines""" |
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|
196 |
def __init__(self): |
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|
197 |
self.useragents = [] |
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|
198 |
self.rulelines = [] |
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|
199 |
|
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|
200 |
def __str__(self): |
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|
201 |
ret = "" |
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|
202 |
for agent in self.useragents: |
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|
203 |
ret = ret + "User-agent: "+agent+"\n" |
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|
204 |
for line in self.rulelines: |
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|
205 |
ret = ret + str(line) + "\n" |
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|
206 |
return ret |
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|
207 |
|
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|
208 |
def applies_to(self, useragent): |
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|
209 |
"""check if this entry applies to the specified agent""" |
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|
210 |
# split the name token and make it lower case |
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|
211 |
useragent = useragent.split("/")[0].lower() |
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|
212 |
for agent in self.useragents: |
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|
213 |
if agent=='*': |
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|
214 |
# we have the catch-all agent |
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|
215 |
return True |
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|
216 |
agent = agent.lower() |
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|
217 |
if agent in useragent: |
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|
218 |
return True |
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|
219 |
return False |
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|
220 |
|
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|
221 |
def allowance(self, filename): |
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|
222 |
"""Preconditions: |
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|
223 |
- our agent applies to this entry |
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|
224 |
- filename is URL decoded""" |
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|
225 |
for line in self.rulelines: |
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|
226 |
_debug((filename, str(line), line.allowance)) |
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|
227 |
if line.applies_to(filename): |
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|
228 |
return line.allowance |
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|
229 |
return True |
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|
230 |
|
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|
231 |
class URLopener(urllib.FancyURLopener): |
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|
232 |
def __init__(self, *args): |
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|
233 |
urllib.FancyURLopener.__init__(self, *args) |
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|
234 |
self.errcode = 200 |
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|
235 |
|
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|
236 |
def prompt_user_passwd(self, host, realm): |
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|
237 |
## If robots.txt file is accessible only with a password, |
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|
238 |
## we act as if the file wasn't there. |
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|
239 |
return None, None |
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|
240 |
|
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|
241 |
def http_error_default(self, url, fp, errcode, errmsg, headers): |
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|
242 |
self.errcode = errcode |
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|
243 |
return urllib.FancyURLopener.http_error_default(self, url, fp, errcode, |
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|
244 |
errmsg, headers) |
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|
245 |
|
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|
246 |
def _check(a,b): |
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|
247 |
if not b: |
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|
248 |
ac = "access denied" |
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|
249 |
else: |
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|
250 |
ac = "access allowed" |
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251 |
if a!=b: |
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252 |
print "failed" |
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253 |
else: |
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254 |
print "ok (%s)" % ac |
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255 |
|
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256 |
|
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257 |
def _test(): |
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258 |
global debug |
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259 |
rp = RobotFileParser() |
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260 |
debug = 1 |
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261 |
|
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262 |
# robots.txt that exists, gotten to by redirection |
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263 |
rp.set_url('http://www.musi-cal.com/robots.txt') |
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264 |
rp.read() |
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265 |
|
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266 |
# test for re.escape |
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267 |
_check(rp.can_fetch('*', 'http://www.musi-cal.com/'), 1) |
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268 |
# this should match the first rule, which is a disallow |
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269 |
_check(rp.can_fetch('', 'http://www.musi-cal.com/'), 0) |
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270 |
# various cherry pickers |
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271 |
_check(rp.can_fetch('CherryPickerSE', |
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272 |
'http://www.musi-cal.com/cgi-bin/event-search' |
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273 |
'?city=San+Francisco'), 0) |
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274 |
_check(rp.can_fetch('CherryPickerSE/1.0', |
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275 |
'http://www.musi-cal.com/cgi-bin/event-search' |
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276 |
'?city=San+Francisco'), 0) |
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_check(rp.can_fetch('CherryPickerSE/1.5', |
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278 |
'http://www.musi-cal.com/cgi-bin/event-search' |
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279 |
'?city=San+Francisco'), 0) |
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280 |
# case sensitivity |
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281 |
_check(rp.can_fetch('ExtractorPro', 'http://www.musi-cal.com/blubba'), 0) |
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282 |
_check(rp.can_fetch('extractorpro', 'http://www.musi-cal.com/blubba'), 0) |
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283 |
# substring test |
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284 |
_check(rp.can_fetch('toolpak/1.1', 'http://www.musi-cal.com/blubba'), 0) |
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285 |
# tests for catch-all * agent |
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286 |
_check(rp.can_fetch('spam', 'http://www.musi-cal.com/search'), 0) |
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287 |
_check(rp.can_fetch('spam', 'http://www.musi-cal.com/Musician/me'), 1) |
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288 |
_check(rp.can_fetch('spam', 'http://www.musi-cal.com/'), 1) |
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289 |
_check(rp.can_fetch('spam', 'http://www.musi-cal.com/'), 1) |
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290 |
|
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291 |
# robots.txt that does not exist |
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292 |
rp.set_url('http://www.lycos.com/robots.txt') |
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293 |
rp.read() |
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294 |
_check(rp.can_fetch('Mozilla', 'http://www.lycos.com/search'), 1) |
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295 |
|
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296 |
if __name__ == '__main__': |
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297 |
_test() |