mirror of
https://github.com/Hopiu/linkchecker.git
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e9805dbd8a
git-svn-id: https://linkchecker.svn.sourceforge.net/svnroot/linkchecker/trunk/linkchecker@3887 e7d03fd6-7b0d-0410-9947-9c21f3af8025
686 lines
27 KiB
Python
686 lines
27 KiB
Python
# -*- coding: iso-8859-1 -*-
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# Copyright (C) 2000-2009 Bastian Kleineidam
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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"""
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Handle http links.
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"""
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import urlparse
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import urllib
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import time
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import re
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import zlib
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import socket
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from cStringIO import StringIO
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import Cookie
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from .. import (log, LOG_CHECK, gzip2 as gzip, strformat, url as urlutil,
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httplib2 as httplib, LinkCheckerError, configuration)
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from . import (internpaturl, proxysupport, httpheaders as headers, urlbase,
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get_url_from)
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# import warnings
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from .const import WARN_HTTP_ROBOTS_DENIED, WARN_HTTP_NO_ANCHOR_SUPPORT, \
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WARN_HTTP_WRONG_REDIRECT, WARN_HTTP_MOVED_PERMANENT, \
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WARN_HTTP_EMPTY_CONTENT, WARN_HTTP_COOKIE_STORE_ERROR, \
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WARN_HTTP_DECOMPRESS_ERROR, WARN_HTTP_UNSUPPORTED_ENCODING, \
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PARSE_MIMETYPES, HTML_MIMETYPES
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# helper alias
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unicode_safe = strformat.unicode_safe
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supportHttps = hasattr(httplib, "HTTPSConnection") and \
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hasattr(socket, "ssl")
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_supported_encodings = ('gzip', 'x-gzip', 'deflate')
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# Amazon blocks all HEAD requests
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_is_amazon = re.compile(r'^www\.amazon\.(com|de|ca|fr|co\.(uk|jp))').search
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# Stolen from Python CVS urllib2.py
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# Mapping status codes to official W3C names
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httpresponses = {
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100: 'Continue',
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101: 'Switching Protocols',
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200: 'OK',
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201: 'Created',
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202: 'Accepted',
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203: 'Non-Authoritative Information',
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204: 'No Content',
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205: 'Reset Content',
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206: 'Partial Content',
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300: 'Multiple Choices',
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301: 'Moved Permanently',
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302: 'Found',
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303: 'See Other',
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304: 'Not Modified',
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305: 'Use Proxy',
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306: '(Unused)',
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307: 'Temporary Redirect',
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400: 'Bad Request',
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401: 'Unauthorized',
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402: 'Payment Required',
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403: 'Forbidden',
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404: 'Not Found',
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405: 'Method Not Allowed',
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406: 'Not Acceptable',
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407: 'Proxy Authentication Required',
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408: 'Request Timeout',
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409: 'Conflict',
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410: 'Gone',
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411: 'Length Required',
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412: 'Precondition Failed',
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413: 'Request Entity Too Large',
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414: 'Request-URI Too Long',
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415: 'Unsupported Media Type',
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416: 'Requested Range Not Satisfiable',
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417: 'Expectation Failed',
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500: 'Internal Server Error',
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501: 'Not Implemented',
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502: 'Bad Gateway',
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503: 'Service Unavailable',
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504: 'Gateway Timeout',
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505: 'HTTP Version Not Supported',
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}
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class HttpUrl (internpaturl.InternPatternUrl, proxysupport.ProxySupport):
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"""
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Url link with http scheme.
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"""
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def reset (self):
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"""
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Initialize HTTP specific variables.
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"""
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super(HttpUrl, self).reset()
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self.max_redirects = 5
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self.has301status = False
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# some servers do not support anchors in requests
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# this flag tells us to remove the anchor in request url
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self.no_anchor = False
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# flag if check had to fallback from HEAD to GET method
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self.fallback_get = False
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# flag if connection is persistent
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self.persistent = False
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# URLs seen through 301/302 redirections
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self.aliases = []
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# initialize check data
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self.headers = None
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self.auth = None
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self.cookies = []
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def allows_robots (self, url):
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"""
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Fetch and parse the robots.txt of given url. Checks if LinkChecker
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can access the requested resource.
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@param url: the url to be requested
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@type url: string
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@return: True if access is granted, otherwise False
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@rtype: bool
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"""
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roboturl = self.get_robots_txt_url()
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user, password = self.get_user_password()
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rb = self.aggregate.robots_txt
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callback = self.aggregate.connections.host_wait
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return rb.allows_url(roboturl, url, self.proxy, user, password,
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callback=callback,)
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def check_connection (self):
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"""
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Check a URL with HTTP protocol.
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Here is an excerpt from RFC 1945 with common response codes:
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The first digit of the Status-Code defines the class of response. The
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last two digits do not have any categorization role. There are 5
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values for the first digit:
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- 1xx: Informational - Not used, but reserved for future use
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- 2xx: Success - The action was successfully received,
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understood, and accepted.
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- 3xx: Redirection - Further action must be taken in order to
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complete the request
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- 4xx: Client Error - The request contains bad syntax or cannot
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be fulfilled
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- 5xx: Server Error - The server failed to fulfill an apparently
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valid request
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"""
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# set the proxy, so a 407 status after this is an error
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self.set_proxy(self.aggregate.config["proxy"].get(self.scheme))
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# check robots.txt
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if not self.allows_robots(self.url):
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# remove all previously stored results
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self.add_warning(
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_("Access denied by robots.txt, checked only syntax."),
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tag=WARN_HTTP_ROBOTS_DENIED)
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self.set_result(u"syntax OK")
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return
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# check for amazon server quirk
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if _is_amazon(self.urlparts[1]):
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self.add_info(_("Amazon servers block HTTP HEAD requests, "
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"using GET instead."))
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self.method = "GET"
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else:
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# first try with HEAD
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self.method = "HEAD"
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# check the http connection
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response = self.check_http_connection()
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if self.headers and "Server" in self.headers:
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server = self.headers['Server']
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else:
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server = _("unknown")
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if self.fallback_get:
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self.add_info(_("Server `%(name)s' did not support HEAD request; "
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"a GET request was used instead.") %
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{"name": server})
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if self.no_anchor:
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self.add_warning(_("Server `%(name)s' had no anchor support, removed"
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" anchor from request.") % {"name": server},
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tag=WARN_HTTP_NO_ANCHOR_SUPPORT)
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# redirections might have changed the URL
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newurl = urlparse.urlunsplit(self.urlparts)
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if self.url != newurl:
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if self.warn_redirect:
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log.warn(LOG_CHECK, _("""URL `%(url)s' has been redirected.
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Use URL `%(newurl)s' instead for checking.""") % {
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'url': self.url, 'newurl': newurl})
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self.url = newurl
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# check response
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if response:
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self.check_response(response)
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response.close()
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def check_http_connection (self):
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"""
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Check HTTP connection and return get response and a flag
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if the check algorithm had to fall back to the GET method.
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@return: response or None if url is already handled
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@rtype: HttpResponse or None
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"""
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response = None
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while True:
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if response is not None:
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response.close()
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try:
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response = self._get_http_response()
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except httplib.BadStatusLine:
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# some servers send empty HEAD replies
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if self.method == "HEAD":
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self.method = "GET"
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self.aliases = []
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self.fallback_get = True
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continue
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raise
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if response.reason:
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response.reason = unicode_safe(response.reason)
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log.debug(LOG_CHECK,
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"Response: %s %s", response.status, response.reason)
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log.debug(LOG_CHECK, "Headers: %s", self.headers)
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# proxy enforcement (overrides standard proxy)
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if response.status == 305 and self.headers:
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oldproxy = (self.proxy, self.proxyauth)
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newproxy = self.headers.getheader("Location")
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self.add_info(_("Enforced proxy `%(name)s'.") %
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{"name": newproxy})
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self.set_proxy(newproxy)
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if not self.proxy:
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self.set_result(
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_("Enforced proxy `%(name)s' ignored, aborting.") %
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{"name": newproxy},
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valid=False)
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return response
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response.close()
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response = self._get_http_response()
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# restore old proxy settings
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self.proxy, self.proxyauth = oldproxy
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try:
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tries, response = self.follow_redirections(response)
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except httplib.BadStatusLine:
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# some servers send empty HEAD replies
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if self.method == "HEAD":
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self.method = "GET"
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self.aliases = []
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self.fallback_get = True
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continue
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raise
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if tries == -1:
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log.debug(LOG_CHECK, "already handled")
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response.close()
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return None
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if tries >= self.max_redirects:
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if self.method == "HEAD":
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# Microsoft servers tend to recurse HEAD requests
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self.method = "GET"
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self.aliases = []
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self.fallback_get = True
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continue
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self.set_result(_("more than %d redirections, aborting") %
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self.max_redirects, valid=False)
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return response
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# user authentication
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if response.status == 401:
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if not self.auth:
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import base64
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_user, _password = self.get_user_password()
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self.auth = "Basic " + \
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base64.encodestring("%s:%s" % (_user, _password))
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log.debug(LOG_CHECK,
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"Authentication %s/%s", _user, _password)
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continue
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elif response.status >= 400:
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if self.headers and self.urlparts[4] and not self.no_anchor:
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self.no_anchor = True
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continue
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# retry with GET (but do not set fallback flag)
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if self.method == "HEAD":
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self.method = "GET"
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self.aliases = []
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continue
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elif self.headers and self.method == "HEAD":
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# test for HEAD support
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mime = headers.get_content_type(self.headers)
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poweredby = self.headers.get('X-Powered-By', '')
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server = self.headers.get('Server', '')
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if mime in ('application/octet-stream', 'text/plain') and \
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(poweredby.startswith('Zope') or server.startswith('Zope')):
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# Zope server could not get Content-Type with HEAD
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self.method = "GET"
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self.aliases = []
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self.fallback_get = True
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continue
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break
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return response
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def follow_redirections (self, response, set_result=True):
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"""
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Follow all redirections of http response.
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"""
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log.debug(LOG_CHECK, "follow all redirections")
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redirected = self.url
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tries = 0
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while response.status in [301, 302] and self.headers and \
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tries < self.max_redirects:
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newurl = self.headers.getheader("Location",
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self.headers.getheader("Uri", ""))
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# make new url absolute and unicode
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newurl = urlparse.urljoin(redirected, newurl)
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newurl = unicode_safe(newurl)
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log.debug(LOG_CHECK, "Redirected to %r", newurl)
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self.add_info(_("Redirected to `%(url)s'.") % {'url': newurl})
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# norm base url - can raise UnicodeError from url.idna_encode()
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redirected, is_idn = urlbase.url_norm(newurl)
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if is_idn:
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pass # XXX warn about idn use
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log.debug(LOG_CHECK, "Norm redirected to %r", redirected)
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urlparts = strformat.url_unicode_split(redirected)
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# check extern filter again
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self.set_extern(redirected)
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if self.extern[0] and self.extern[0]:
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if set_result:
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self.add_info(
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_("The redirected URL is outside of the domain "
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"filter, checked only syntax."))
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self.set_result(u"filtered")
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return -1, response
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# check robots.txt allowance again
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if not self.allows_robots(redirected):
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if set_result:
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self.add_warning(
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_("Access to redirected URL denied by robots.txt, "
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"checked only syntax."),
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tag=WARN_HTTP_ROBOTS_DENIED)
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self.set_result(u"syntax OK")
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return -1, response
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# see about recursive redirect
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all_seen = [self.cache_url_key] + self.aliases
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if redirected in all_seen:
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if self.method == "HEAD":
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# Microsoft servers tend to recurse HEAD requests
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# fall back to the original url and use GET
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return self.max_redirects, response
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recursion = all_seen + [redirected]
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if set_result:
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self.set_result(
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_("recursive redirection encountered:\n %(urls)s") %
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{"urls": "\n => ".join(recursion)}, valid=False)
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return -1, response
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if urlparts[0] == self.scheme:
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# remember redireced url as alias
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self.aliases.append(redirected)
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# note: urlparts has to be a list
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self.urlparts = urlparts
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if response.status == 301:
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if not self.has301status:
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if set_result:
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self.add_warning(
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_("HTTP 301 (moved permanent) encountered: you"
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" should update this link."),
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tag=WARN_HTTP_MOVED_PERMANENT)
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self.has301status = True
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# check cache again on the changed URL
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if self.aggregate.urlqueue.checked_redirect(redirected, self):
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return -1, response
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# in case of changed scheme make new URL object
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if self.urlparts[0] != self.scheme:
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if set_result:
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self.add_warning(
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_("Redirection to different URL type encountered; "
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"the original URL was `%(url)s'.") %
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{"url": self.url},
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tag=WARN_HTTP_WRONG_REDIRECT)
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newobj = get_url_from(
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redirected, self.recursion_level, self.aggregate,
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parent_url=self.parent_url, base_ref=self.base_ref,
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line=self.line, column=self.column, name=self.name)
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# append new object to queue
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self.aggregate.urlqueue.put(newobj)
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# pretend to be finished and logged
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return -1, response
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# new response data
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response.close()
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response = self._get_http_response()
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tries += 1
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return tries, response
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def get_alias_cache_data (self):
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"""
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Return all data values that should be put in the cache,
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minus redirection warnings.
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"""
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data = self.get_cache_data()
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data["warnings"] = [
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x for x in self.warnings if x[0] != "http-moved-permanent"]
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data["info"] = [x for x in self.info if x[0] != "http-redirect"]
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return data
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def check_response (self, response):
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"""
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Check final result and log it.
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"""
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if response.status >= 400:
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self.set_result(u"%r %s" % (response.status, response.reason),
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valid=False)
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else:
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if response.status == 204:
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# no content
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self.add_warning(unicode_safe(response.reason),
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tag=WARN_HTTP_EMPTY_CONTENT)
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# store cookies for valid links
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if self.aggregate.config['storecookies']:
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for c in self.cookies:
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self.add_info(_("Store cookie: %(cookie)s.") %
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{"cookie": c})
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try:
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out = self.aggregate.cookies.add(self.headers,
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self.urlparts[0],
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self.urlparts[1],
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self.urlparts[2])
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for h in out:
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self.add_info(unicode_safe(h))
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except Cookie.CookieError, msg:
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self.add_warning(_("Could not store cookies: %(msg)s.") %
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{'msg': str(msg)},
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tag=WARN_HTTP_COOKIE_STORE_ERROR)
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if response.status >= 200:
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self.set_result(u"%r %s" % (response.status, response.reason))
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else:
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self.set_result(u"OK")
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modified = self.headers.get('Last-Modified', '')
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if modified:
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self.add_info(_("Last modified %(date)s.") % {"date": modified})
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def _get_http_response (self):
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"""
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Send HTTP request and get response object.
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"""
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if self.proxy:
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host = self.proxy
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scheme = "http"
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else:
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host = self.urlparts[1]
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scheme = self.urlparts[0]
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log.debug(LOG_CHECK, "Connecting to %r", host)
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# close/release a previous connection
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self.close_connection()
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self.url_connection = self.get_http_object(host, scheme)
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if self.no_anchor:
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anchor = ''
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else:
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anchor = self.urlparts[4]
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if self.proxy:
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path = urlparse.urlunsplit((self.urlparts[0], self.urlparts[1],
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self.urlparts[2], self.urlparts[3], anchor))
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else:
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path = urlparse.urlunsplit(('', '', self.urlparts[2],
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self.urlparts[3], anchor))
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self.url_connection.putrequest(self.method, path, skip_host=True,
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skip_accept_encoding=True)
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self.url_connection.putheader("Host", host)
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# userinfo is from http://user@pass:host/
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if self.userinfo:
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self.url_connection.putheader("Authorization", self.userinfo)
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# auth is the -u and -p configuration options
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elif self.auth:
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self.url_connection.putheader("Authorization", self.auth)
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if self.proxyauth:
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self.url_connection.putheader("Proxy-Authorization",
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self.proxyauth)
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if (self.parent_url and
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self.parent_url.startswith(('http://', 'https://'))):
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self.url_connection.putheader("Referer", self.parent_url)
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self.url_connection.putheader("User-Agent", configuration.UserAgent)
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self.url_connection.putheader("Accept-Encoding",
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"gzip;q=1.0, deflate;q=0.9, identity;q=0.5")
|
|
if self.aggregate.config['sendcookies']:
|
|
scheme = self.urlparts[0]
|
|
host = self.urlparts[1]
|
|
port = urlutil.default_ports.get(scheme, 80)
|
|
host, port = urllib.splitnport(host, port)
|
|
path = self.urlparts[2]
|
|
self.cookies = self.aggregate.cookies.get(scheme, host, port, path)
|
|
for c in self.cookies:
|
|
name = c.client_header_name()
|
|
value = c.client_header_value()
|
|
self.url_connection.putheader(name, value)
|
|
self.url_connection.endheaders()
|
|
response = self.url_connection.getresponse()
|
|
self.timeout = headers.http_timeout(response)
|
|
self.headers = response.msg
|
|
self.persistent = not response.will_close
|
|
if self.persistent and self.method == "HEAD":
|
|
# Some servers send page content after a HEAD request,
|
|
# but only after making the *next* request. This breaks
|
|
# protocol synchronisation. Workaround here is to close
|
|
# the connection after HEAD.
|
|
# Example: http://www.empleo.gob.mx (Apache/1.3.33 (Unix) mod_jk)
|
|
self.persistent = False
|
|
if self.persistent and (self.method == "GET" or
|
|
self.headers.getheader("Content-Length") != "0"):
|
|
# always read content from persistent connections
|
|
self._read_content(response)
|
|
# If possible, use official W3C HTTP response name
|
|
if response.status in httpresponses:
|
|
response.reason = httpresponses[response.status]
|
|
return response
|
|
|
|
def get_http_object (self, host, scheme):
|
|
"""
|
|
Open a HTTP connection.
|
|
|
|
@param host: the host to connect to
|
|
@type host: string of the form <host>[:<port>]
|
|
@param scheme: 'http' or 'https'
|
|
@type scheme: string
|
|
@return: open HTTP(S) connection
|
|
@rtype: httplib.HTTP(S)Connection
|
|
"""
|
|
_user, _password = self.get_user_password()
|
|
key = (scheme, self.urlparts[1], _user, _password)
|
|
conn = self.aggregate.connections.get(key)
|
|
if conn is not None:
|
|
log.debug(LOG_CHECK, "reuse cached HTTP(S) connection %s", conn)
|
|
return conn
|
|
self.aggregate.connections.wait_for_host(host)
|
|
if scheme == "http":
|
|
h = httplib.HTTPConnection(host)
|
|
elif scheme == "https" and supportHttps:
|
|
h = httplib.HTTPSConnection(host)
|
|
else:
|
|
msg = _("Unsupported HTTP url scheme `%(scheme)s'") % {"scheme": scheme}
|
|
raise LinkCheckerError(msg)
|
|
if log.is_debug(LOG_CHECK):
|
|
h.set_debuglevel(1)
|
|
h.connect()
|
|
return h
|
|
|
|
def get_content (self):
|
|
"""
|
|
Get content of the URL target. The content data is cached after
|
|
the first call to this method.
|
|
|
|
@return: URL content, decompressed and decoded
|
|
@rtype: string
|
|
"""
|
|
if self.data is None:
|
|
self.method = "GET"
|
|
response = self._get_http_response()
|
|
response = self.follow_redirections(response, set_result=False)[1]
|
|
self.headers = response.msg
|
|
self._read_content(response)
|
|
if self.data is None:
|
|
self.data = ""
|
|
return self.data
|
|
|
|
def _read_content (self, response):
|
|
t = time.time()
|
|
data = response.read()
|
|
encoding = headers.get_content_encoding(self.headers)
|
|
if encoding in _supported_encodings:
|
|
try:
|
|
if encoding == 'deflate':
|
|
f = StringIO(zlib.decompress(data))
|
|
else:
|
|
f = gzip.GzipFile('', 'rb', 9, StringIO(data))
|
|
except zlib.error, msg:
|
|
self.add_warning(_("Decompress error %(err)s") %
|
|
{"err": str(msg)},
|
|
tag=WARN_HTTP_DECOMPRESS_ERROR)
|
|
f = StringIO(data)
|
|
data = f.read()
|
|
if self.data is None and self.method == "GET" and \
|
|
response.status not in [301, 302]:
|
|
self.data = data
|
|
self.dltime = time.time() - t
|
|
|
|
def encoding_supported (self):
|
|
"""Check if page encoding is supported."""
|
|
encoding = headers.get_content_encoding(self.headers)
|
|
if encoding and encoding not in _supported_encodings and \
|
|
encoding != 'identity':
|
|
self.add_warning(_("Unsupported content encoding `%(encoding)s'.") %
|
|
{"encoding": encoding},
|
|
tag=WARN_HTTP_UNSUPPORTED_ENCODING)
|
|
return False
|
|
return True
|
|
|
|
def is_html (self):
|
|
"""
|
|
See if this URL points to a HTML file by looking at the
|
|
Content-Type header, file extension and file content.
|
|
|
|
@return: True if URL points to HTML file
|
|
@rtype: bool
|
|
"""
|
|
if not (self.valid and self.headers):
|
|
return False
|
|
if headers.get_content_type(self.headers) not in HTML_MIMETYPES:
|
|
return False
|
|
return self.encoding_supported()
|
|
|
|
def is_css (self):
|
|
"""Return True iff content of this url is CSS stylesheet."""
|
|
if not (self.valid and self.headers):
|
|
return False
|
|
if headers.get_content_type(self.headers) != "text/css":
|
|
return False
|
|
return self.encoding_supported()
|
|
|
|
def is_http (self):
|
|
"""
|
|
This is a HTTP file.
|
|
|
|
@return: True
|
|
@rtype: bool
|
|
"""
|
|
return True
|
|
|
|
def is_parseable (self):
|
|
"""
|
|
Check if content is parseable for recursion.
|
|
|
|
@return: True if content is parseable
|
|
@rtype: bool
|
|
"""
|
|
if not (self.valid and self.headers):
|
|
return False
|
|
if headers.get_content_type(self.headers) not in PARSE_MIMETYPES:
|
|
return False
|
|
return self.encoding_supported()
|
|
|
|
def parse_url (self):
|
|
"""
|
|
Parse file contents for new links to check.
|
|
"""
|
|
ctype = headers.get_content_type(self.headers)
|
|
if self.is_html():
|
|
self.parse_html()
|
|
elif self.is_css():
|
|
self.parse_css()
|
|
elif ctype == "application/x-shockwave-flash":
|
|
self.parse_swf()
|
|
|
|
def get_robots_txt_url (self):
|
|
"""
|
|
Get the according robots.txt URL for this URL.
|
|
|
|
@return: robots.txt URL
|
|
@rtype: string
|
|
"""
|
|
return "%s://%s/robots.txt" % tuple(self.urlparts[0:2])
|
|
|
|
def close_connection (self):
|
|
"""
|
|
If connection is persistent, add it to the connection pool.
|
|
Else close the connection. Errors on closing are ignored.
|
|
"""
|
|
if self.url_connection is None:
|
|
# no connection is open
|
|
return
|
|
# add to cached connections
|
|
_user, _password = self.get_user_password()
|
|
key = ("http", self.urlparts[1], _user, _password)
|
|
if self.persistent and self.url_connection.is_idle():
|
|
self.aggregate.connections.add(
|
|
key, self.url_connection, self.timeout)
|
|
else:
|
|
try:
|
|
self.url_connection.close()
|
|
except Exception:
|
|
# ignore close errors
|
|
pass
|
|
self.url_connection = None
|