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# Copyright (C) 1998,1999 marduk <marduk@python.net>
# Copyright (C) 2002 Mike Meyer <mwm@mired.org>
# 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., 675 Mass Ave, Cambridge, MA 02139, USA.
"""This module defines the functions needed for creating Link objects for urls
using the http scheme"""
import myUrlLib
import string
import httplib
import urllib
import time
import urlparse
import base64
import mimetypes
import debugio
import version
config = myUrlLib.config
Link = myUrlLib.Link
proxies = config.PROXIES
if proxies is None:
proxies = urllib.getproxies()
redirect_depth = 0
opener = urllib.FancyURLopener(proxies)
opener.addheaders = [('User-agent','Webcheck ' + version.webcheck)]
def get_reply(url):
"""Open connection to url and report information given by HEAD command"""
global redirect_depth
parsed = urlparse.urlparse(url)
if proxies and proxies.has_key('http'):
host = urlparse.urlparse(proxies['http'])[1]
document = url
else:
host = parsed[1]
document = string.join(parsed[2:4],'')
if not document: document = '/'
debugio.write('document= %s' % document,3)
(username, passwd, realhost, port) = parse_host(host)
h = httplib.HTTP()
if port:
h.connect(realhost, port)
else:
h.connect(realhost)
h.putrequest('HEAD', document)
if username and passwd:
auth = string.strip(base64.encodestring(username + ":" + passwd))
h.putheader('Authorization', 'Basic %s' % auth)
h.putheader('User-Agent','Webcheck %s' % version.webcheck)
h.putheader('Host',realhost)
h.endheaders()
errcode, errmsg, headers = h.getreply()
h.close()
debugio.write(errcode,2)
debugio.write(errmsg,2)
if errcode == 301 or errcode == 302:
redirect_depth = redirect_depth + 1
if redirect_depth > config.REDIRECT_DEPTH:
debugio.write('\tToo many redirects!')
redirect_depth = 0
return (errcode, errmsg, headers, url)
redirect = headers['location']
redirect = urlparse.urljoin(url,redirect)
if redirect == url:
debugio.write('\tRedirect same as source: %s' % redirect)
redirect_depth = 0
return (errcode, errmsg, headers, url)
debugio.write('\tRedirected to: ' + redirect)
if Link.linkList.has_key(redirect):
link = Link.linkList[redirect]
return (link.status, link.message, link.headers, link.URL)
return get_reply(redirect)
return (errcode, errmsg, headers, url)
def init(self, url, parent):
""" Here, self is a reference of the link object that is calling this
pseudo-method"""
(self.status, self.message, self.headers, self.URL) = get_reply(myUrlLib.basejoin(parent,url))
Link.linkList[self.URL] = self
try:
self.type = self.headers.gettype()
except AttributeError:
self.type = 'text/html' # is this a good enough default?
debugio.write('\tContent-type: ' + self.type,2)
try:
self.size = int(self.headers['content-length'])
except (KeyError, TypeError):
self.size = 0
if (self.status != 200) and (self.status != 'Not Checked'):
self.set_bad_link(self.URL,str(self.status) + ": " + self.message)
return
try:
lastMod = time.mktime(self.headers.getdate('Last-Modified'))
except (OverflowError, TypeError, ValueError):
lastMod = None
if lastMod:
self.age = int((time.time()-lastMod)/myUrlLib.SECS_PER_DAY)
def get_document(url):
document = opener.open(url).read()
opener.cleanup()
return document
def parse_host(location):
"""Return a tuple (user, password, host, port)
takes string http://user:password@hostname:hostport and
returns a tuple. If a field is null in the string it will be
returned as None in the tuple.
"""
#location = urlparse.urlparse(host)[1]
debugio.write("network location= %s" % location,3)
at = string.find(location, "@")
if at > -1:
userpass = location[:at]
colon = string.find(userpass, ":")
if colon > -1:
user = userpass[:colon]
passw = userpass[colon+1:]
else:
user = userpass
passw = None
hostport = location[at+1:]
else:
user = passw = None
hostport = location
colon = string.find(hostport, ":")
if colon > -1:
hostname = hostport[:colon]
port = hostport[colon+1:]
else:
hostname = hostport
port = None
debugio.write("parse_host = %s %s %s %s" % (user, passw, hostname, port),3)
return (user, passw, hostname, port)
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