1404 lines
48 KiB
Python
1404 lines
48 KiB
Python
"""An extensible library for opening URLs using a variety of protocols
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The simplest way to use this module is to call the urlopen function,
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which accepts a string containing a URL or a Request object (described
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below). It opens the URL and returns the results as file-like
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object; the returned object has some extra methods described below.
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The OpenerDirector manages a collection of Handler objects that do
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all the actual work. Each Handler implements a particular protocol or
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option. The OpenerDirector is a composite object that invokes the
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Handlers needed to open the requested URL. For example, the
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HTTPHandler performs HTTP GET and POST requests and deals with
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non-error returns. The HTTPRedirectHandler automatically deals with
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HTTP 301, 302, 303 and 307 redirect errors, and the HTTPDigestAuthHandler
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deals with digest authentication.
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urlopen(url, data=None) -- Basic usage is the same as original
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urllib. pass the url and optionally data to post to an HTTP URL, and
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get a file-like object back. One difference is that you can also pass
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a Request instance instead of URL. Raises a URLError (subclass of
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IOError); for HTTP errors, raises an HTTPError, which can also be
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treated as a valid response.
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build_opener -- Function that creates a new OpenerDirector instance.
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Will install the default handlers. Accepts one or more Handlers as
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arguments, either instances or Handler classes that it will
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instantiate. If one of the argument is a subclass of the default
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handler, the argument will be installed instead of the default.
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install_opener -- Installs a new opener as the default opener.
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objects of interest:
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OpenerDirector -- Sets up the User Agent as the Python-urllib client and manages
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the Handler classes, while dealing with requests and responses.
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Request -- An object that encapsulates the state of a request. The
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state can be as simple as the URL. It can also include extra HTTP
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headers, e.g. a User-Agent.
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BaseHandler --
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exceptions:
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URLError -- A subclass of IOError, individual protocols have their own
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specific subclass.
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HTTPError -- Also a valid HTTP response, so you can treat an HTTP error
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as an exceptional event or valid response.
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internals:
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BaseHandler and parent
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_call_chain conventions
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Example usage:
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import urllib2
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# set up authentication info
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authinfo = urllib2.HTTPBasicAuthHandler()
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authinfo.add_password(realm='PDQ Application',
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uri='https://mahler:8092/site-updates.py',
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user='klem',
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passwd='geheim$parole')
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proxy_support = urllib2.ProxyHandler({"http" : "http://ahad-haam:3128"})
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# build a new opener that adds authentication and caching FTP handlers
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opener = urllib2.build_opener(proxy_support, authinfo, urllib2.CacheFTPHandler)
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# install it
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urllib2.install_opener(opener)
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f = urllib2.urlopen('http://www.python.org/')
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"""
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# XXX issues:
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# If an authentication error handler that tries to perform
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# authentication for some reason but fails, how should the error be
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# signalled? The client needs to know the HTTP error code. But if
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# the handler knows that the problem was, e.g., that it didn't know
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# that hash algo that requested in the challenge, it would be good to
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# pass that information along to the client, too.
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# ftp errors aren't handled cleanly
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# check digest against correct (i.e. non-apache) implementation
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# Possible extensions:
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# complex proxies XXX not sure what exactly was meant by this
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# abstract factory for opener
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import base64
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import hashlib
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import httplib
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import mimetools
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import os
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import posixpath
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import random
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import re
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import socket
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import sys
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import time
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import urlparse
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import bisect
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try:
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from cStringIO import StringIO
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except ImportError:
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from StringIO import StringIO
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from urllib import (unwrap, unquote, splittype, splithost, quote,
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addinfourl, splitport,
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splitattr, ftpwrapper, splituser, splitpasswd, splitvalue)
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# support for FileHandler, proxies via environment variables
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from urllib import localhost, url2pathname, getproxies, proxy_bypass
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# used in User-Agent header sent
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__version__ = sys.version[:3]
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_opener = None
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def urlopen(url, data=None, timeout=socket._GLOBAL_DEFAULT_TIMEOUT):
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global _opener
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if _opener is None:
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_opener = build_opener()
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return _opener.open(url, data, timeout)
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def install_opener(opener):
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global _opener
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_opener = opener
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# do these error classes make sense?
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# make sure all of the IOError stuff is overridden. we just want to be
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# subtypes.
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class URLError(IOError):
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# URLError is a sub-type of IOError, but it doesn't share any of
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# the implementation. need to override __init__ and __str__.
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# It sets self.args for compatibility with other EnvironmentError
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# subclasses, but args doesn't have the typical format with errno in
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# slot 0 and strerror in slot 1. This may be better than nothing.
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def __init__(self, reason):
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self.args = reason,
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self.reason = reason
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def __str__(self):
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return '<urlopen error %s>' % self.reason
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class HTTPError(URLError, addinfourl):
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"""Raised when HTTP error occurs, but also acts like non-error return"""
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__super_init = addinfourl.__init__
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def __init__(self, url, code, msg, hdrs, fp):
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self.code = code
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self.msg = msg
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self.hdrs = hdrs
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self.fp = fp
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self.filename = url
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# The addinfourl classes depend on fp being a valid file
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# object. In some cases, the HTTPError may not have a valid
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# file object. If this happens, the simplest workaround is to
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# not initialize the base classes.
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if fp is not None:
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self.__super_init(fp, hdrs, url, code)
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def __str__(self):
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return 'HTTP Error %s: %s' % (self.code, self.msg)
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# copied from cookielib.py
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_cut_port_re = re.compile(r":\d+$")
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def request_host(request):
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"""Return request-host, as defined by RFC 2965.
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Variation from RFC: returned value is lowercased, for convenient
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comparison.
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"""
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url = request.get_full_url()
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host = urlparse.urlparse(url)[1]
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if host == "":
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host = request.get_header("Host", "")
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# remove port, if present
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host = _cut_port_re.sub("", host, 1)
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return host.lower()
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class Request:
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def __init__(self, url, data=None, headers={},
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origin_req_host=None, unverifiable=False):
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# unwrap('<URL:type://host/path>') --> 'type://host/path'
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self.__original = unwrap(url)
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self.type = None
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# self.__r_type is what's left after doing the splittype
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self.host = None
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self.port = None
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self._tunnel_host = None
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self.data = data
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self.headers = {}
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for key, value in headers.items():
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self.add_header(key, value)
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self.unredirected_hdrs = {}
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if origin_req_host is None:
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origin_req_host = request_host(self)
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self.origin_req_host = origin_req_host
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self.unverifiable = unverifiable
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def __getattr__(self, attr):
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# XXX this is a fallback mechanism to guard against these
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# methods getting called in a non-standard order. this may be
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# too complicated and/or unnecessary.
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# XXX should the __r_XXX attributes be public?
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if attr[:12] == '_Request__r_':
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name = attr[12:]
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if hasattr(Request, 'get_' + name):
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getattr(self, 'get_' + name)()
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return getattr(self, attr)
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raise AttributeError, attr
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def get_method(self):
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if self.has_data():
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return "POST"
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else:
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return "GET"
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# XXX these helper methods are lame
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def add_data(self, data):
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self.data = data
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def has_data(self):
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return self.data is not None
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def get_data(self):
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return self.data
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def get_full_url(self):
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return self.__original
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def get_type(self):
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if self.type is None:
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self.type, self.__r_type = splittype(self.__original)
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if self.type is None:
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raise ValueError, "unknown url type: %s" % self.__original
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return self.type
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def get_host(self):
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if self.host is None:
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self.host, self.__r_host = splithost(self.__r_type)
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if self.host:
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self.host = unquote(self.host)
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return self.host
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def get_selector(self):
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return self.__r_host
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def set_proxy(self, host, type):
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if self.type == 'https' and not self._tunnel_host:
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self._tunnel_host = self.host
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else:
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self.type = type
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self.__r_host = self.__original
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self.host = host
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def has_proxy(self):
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return self.__r_host == self.__original
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def get_origin_req_host(self):
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return self.origin_req_host
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def is_unverifiable(self):
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return self.unverifiable
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def add_header(self, key, val):
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# useful for something like authentication
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self.headers[key.capitalize()] = val
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def add_unredirected_header(self, key, val):
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# will not be added to a redirected request
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self.unredirected_hdrs[key.capitalize()] = val
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def has_header(self, header_name):
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return (header_name in self.headers or
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header_name in self.unredirected_hdrs)
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def get_header(self, header_name, default=None):
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return self.headers.get(
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header_name,
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self.unredirected_hdrs.get(header_name, default))
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def header_items(self):
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hdrs = self.unredirected_hdrs.copy()
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hdrs.update(self.headers)
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return hdrs.items()
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class OpenerDirector:
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def __init__(self):
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client_version = "Python-urllib/%s" % __version__
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self.addheaders = [('User-agent', client_version)]
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# manage the individual handlers
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self.handlers = []
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self.handle_open = {}
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self.handle_error = {}
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self.process_response = {}
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self.process_request = {}
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def add_handler(self, handler):
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if not hasattr(handler, "add_parent"):
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raise TypeError("expected BaseHandler instance, got %r" %
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type(handler))
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added = False
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for meth in dir(handler):
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if meth in ["redirect_request", "do_open", "proxy_open"]:
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# oops, coincidental match
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continue
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i = meth.find("_")
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protocol = meth[:i]
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condition = meth[i+1:]
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if condition.startswith("error"):
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j = condition.find("_") + i + 1
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kind = meth[j+1:]
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try:
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kind = int(kind)
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except ValueError:
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pass
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lookup = self.handle_error.get(protocol, {})
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self.handle_error[protocol] = lookup
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elif condition == "open":
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kind = protocol
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lookup = self.handle_open
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elif condition == "response":
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kind = protocol
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lookup = self.process_response
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elif condition == "request":
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kind = protocol
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lookup = self.process_request
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else:
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continue
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handlers = lookup.setdefault(kind, [])
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if handlers:
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bisect.insort(handlers, handler)
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else:
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handlers.append(handler)
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added = True
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if added:
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# the handlers must work in an specific order, the order
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# is specified in a Handler attribute
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bisect.insort(self.handlers, handler)
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handler.add_parent(self)
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def close(self):
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# Only exists for backwards compatibility.
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pass
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def _call_chain(self, chain, kind, meth_name, *args):
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# Handlers raise an exception if no one else should try to handle
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# the request, or return None if they can't but another handler
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# could. Otherwise, they return the response.
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handlers = chain.get(kind, ())
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for handler in handlers:
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func = getattr(handler, meth_name)
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result = func(*args)
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if result is not None:
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return result
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def open(self, fullurl, data=None, timeout=socket._GLOBAL_DEFAULT_TIMEOUT):
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# accept a URL or a Request object
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if isinstance(fullurl, basestring):
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req = Request(fullurl, data)
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else:
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req = fullurl
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if data is not None:
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req.add_data(data)
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req.timeout = timeout
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protocol = req.get_type()
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# pre-process request
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meth_name = protocol+"_request"
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for processor in self.process_request.get(protocol, []):
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meth = getattr(processor, meth_name)
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req = meth(req)
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response = self._open(req, data)
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# post-process response
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meth_name = protocol+"_response"
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for processor in self.process_response.get(protocol, []):
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meth = getattr(processor, meth_name)
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response = meth(req, response)
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return response
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def _open(self, req, data=None):
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result = self._call_chain(self.handle_open, 'default',
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'default_open', req)
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if result:
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return result
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protocol = req.get_type()
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result = self._call_chain(self.handle_open, protocol, protocol +
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'_open', req)
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if result:
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return result
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return self._call_chain(self.handle_open, 'unknown',
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'unknown_open', req)
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def error(self, proto, *args):
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if proto in ('http', 'https'):
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# XXX http[s] protocols are special-cased
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dict = self.handle_error['http'] # https is not different than http
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proto = args[2] # YUCK!
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meth_name = 'http_error_%s' % proto
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http_err = 1
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orig_args = args
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else:
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dict = self.handle_error
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meth_name = proto + '_error'
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http_err = 0
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args = (dict, proto, meth_name) + args
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result = self._call_chain(*args)
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if result:
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return result
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if http_err:
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args = (dict, 'default', 'http_error_default') + orig_args
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return self._call_chain(*args)
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# XXX probably also want an abstract factory that knows when it makes
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# sense to skip a superclass in favor of a subclass and when it might
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# make sense to include both
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def build_opener(*handlers):
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"""Create an opener object from a list of handlers.
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The opener will use several default handlers, including support
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for HTTP, FTP and when applicable, HTTPS.
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If any of the handlers passed as arguments are subclasses of the
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default handlers, the default handlers will not be used.
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"""
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import types
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def isclass(obj):
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return isinstance(obj, types.ClassType) or hasattr(obj, "__bases__")
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opener = OpenerDirector()
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default_classes = [ProxyHandler, UnknownHandler, HTTPHandler,
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HTTPDefaultErrorHandler, HTTPRedirectHandler,
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FTPHandler, FileHandler, HTTPErrorProcessor]
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if hasattr(httplib, 'HTTPS'):
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default_classes.append(HTTPSHandler)
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skip = set()
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for klass in default_classes:
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for check in handlers:
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if isclass(check):
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if issubclass(check, klass):
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skip.add(klass)
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elif isinstance(check, klass):
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skip.add(klass)
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for klass in skip:
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default_classes.remove(klass)
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for klass in default_classes:
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opener.add_handler(klass())
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for h in handlers:
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if isclass(h):
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h = h()
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opener.add_handler(h)
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return opener
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class BaseHandler:
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handler_order = 500
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def add_parent(self, parent):
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self.parent = parent
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def close(self):
|
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# Only exists for backwards compatibility
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pass
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def __lt__(self, other):
|
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if not hasattr(other, "handler_order"):
|
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# Try to preserve the old behavior of having custom classes
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# inserted after default ones (works only for custom user
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# classes which are not aware of handler_order).
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return True
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return self.handler_order < other.handler_order
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class HTTPErrorProcessor(BaseHandler):
|
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"""Process HTTP error responses."""
|
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handler_order = 1000 # after all other processing
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def http_response(self, request, response):
|
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code, msg, hdrs = response.code, response.msg, response.info()
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|
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# According to RFC 2616, "2xx" code indicates that the client's
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# request was successfully received, understood, and accepted.
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if not (200 <= code < 300):
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response = self.parent.error(
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'http', request, response, code, msg, hdrs)
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return response
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|
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https_response = http_response
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|
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class HTTPDefaultErrorHandler(BaseHandler):
|
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def http_error_default(self, req, fp, code, msg, hdrs):
|
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raise HTTPError(req.get_full_url(), code, msg, hdrs, fp)
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|
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class HTTPRedirectHandler(BaseHandler):
|
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# maximum number of redirections to any single URL
|
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# this is needed because of the state that cookies introduce
|
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max_repeats = 4
|
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# maximum total number of redirections (regardless of URL) before
|
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# assuming we're in a loop
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max_redirections = 10
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|
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def redirect_request(self, req, fp, code, msg, headers, newurl):
|
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"""Return a Request or None in response to a redirect.
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|
|
This is called by the http_error_30x methods when a
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redirection response is received. If a redirection should
|
|
take place, return a new Request to allow http_error_30x to
|
|
perform the redirect. Otherwise, raise HTTPError if no-one
|
|
else should try to handle this url. Return None if you can't
|
|
but another Handler might.
|
|
"""
|
|
m = req.get_method()
|
|
if (code in (301, 302, 303, 307) and m in ("GET", "HEAD")
|
|
or code in (301, 302, 303) and m == "POST"):
|
|
# Strictly (according to RFC 2616), 301 or 302 in response
|
|
# to a POST MUST NOT cause a redirection without confirmation
|
|
# from the user (of urllib2, in this case). In practice,
|
|
# essentially all clients do redirect in this case, so we
|
|
# do the same.
|
|
# be conciliant with URIs containing a space
|
|
newurl = newurl.replace(' ', '%20')
|
|
newheaders = dict((k,v) for k,v in req.headers.items()
|
|
if k.lower() not in ("content-length", "content-type")
|
|
)
|
|
return Request(newurl,
|
|
headers=newheaders,
|
|
origin_req_host=req.get_origin_req_host(),
|
|
unverifiable=True)
|
|
else:
|
|
raise HTTPError(req.get_full_url(), code, msg, headers, fp)
|
|
|
|
# Implementation note: To avoid the server sending us into an
|
|
# infinite loop, the request object needs to track what URLs we
|
|
# have already seen. Do this by adding a handler-specific
|
|
# attribute to the Request object.
|
|
def http_error_302(self, req, fp, code, msg, headers):
|
|
# Some servers (incorrectly) return multiple Location headers
|
|
# (so probably same goes for URI). Use first header.
|
|
if 'location' in headers:
|
|
newurl = headers.getheaders('location')[0]
|
|
elif 'uri' in headers:
|
|
newurl = headers.getheaders('uri')[0]
|
|
else:
|
|
return
|
|
|
|
# fix a possible malformed URL
|
|
urlparts = urlparse.urlparse(newurl)
|
|
if not urlparts.path:
|
|
urlparts = list(urlparts)
|
|
urlparts[2] = "/"
|
|
newurl = urlparse.urlunparse(urlparts)
|
|
|
|
newurl = urlparse.urljoin(req.get_full_url(), newurl)
|
|
|
|
# XXX Probably want to forget about the state of the current
|
|
# request, although that might interact poorly with other
|
|
# handlers that also use handler-specific request attributes
|
|
new = self.redirect_request(req, fp, code, msg, headers, newurl)
|
|
if new is None:
|
|
return
|
|
|
|
# loop detection
|
|
# .redirect_dict has a key url if url was previously visited.
|
|
if hasattr(req, 'redirect_dict'):
|
|
visited = new.redirect_dict = req.redirect_dict
|
|
if (visited.get(newurl, 0) >= self.max_repeats or
|
|
len(visited) >= self.max_redirections):
|
|
raise HTTPError(req.get_full_url(), code,
|
|
self.inf_msg + msg, headers, fp)
|
|
else:
|
|
visited = new.redirect_dict = req.redirect_dict = {}
|
|
visited[newurl] = visited.get(newurl, 0) + 1
|
|
|
|
# Don't close the fp until we are sure that we won't use it
|
|
# with HTTPError.
|
|
fp.read()
|
|
fp.close()
|
|
|
|
return self.parent.open(new, timeout=req.timeout)
|
|
|
|
http_error_301 = http_error_303 = http_error_307 = http_error_302
|
|
|
|
inf_msg = "The HTTP server returned a redirect error that would " \
|
|
"lead to an infinite loop.\n" \
|
|
"The last 30x error message was:\n"
|
|
|
|
|
|
def _parse_proxy(proxy):
|
|
"""Return (scheme, user, password, host/port) given a URL or an authority.
|
|
|
|
If a URL is supplied, it must have an authority (host:port) component.
|
|
According to RFC 3986, having an authority component means the URL must
|
|
have two slashes after the scheme:
|
|
|
|
>>> _parse_proxy('file:/ftp.example.com/')
|
|
Traceback (most recent call last):
|
|
ValueError: proxy URL with no authority: 'file:/ftp.example.com/'
|
|
|
|
The first three items of the returned tuple may be None.
|
|
|
|
Examples of authority parsing:
|
|
|
|
>>> _parse_proxy('proxy.example.com')
|
|
(None, None, None, 'proxy.example.com')
|
|
>>> _parse_proxy('proxy.example.com:3128')
|
|
(None, None, None, 'proxy.example.com:3128')
|
|
|
|
The authority component may optionally include userinfo (assumed to be
|
|
username:password):
|
|
|
|
>>> _parse_proxy('joe:password@proxy.example.com')
|
|
(None, 'joe', 'password', 'proxy.example.com')
|
|
>>> _parse_proxy('joe:password@proxy.example.com:3128')
|
|
(None, 'joe', 'password', 'proxy.example.com:3128')
|
|
|
|
Same examples, but with URLs instead:
|
|
|
|
>>> _parse_proxy('http://proxy.example.com/')
|
|
('http', None, None, 'proxy.example.com')
|
|
>>> _parse_proxy('http://proxy.example.com:3128/')
|
|
('http', None, None, 'proxy.example.com:3128')
|
|
>>> _parse_proxy('http://joe:password@proxy.example.com/')
|
|
('http', 'joe', 'password', 'proxy.example.com')
|
|
>>> _parse_proxy('http://joe:password@proxy.example.com:3128')
|
|
('http', 'joe', 'password', 'proxy.example.com:3128')
|
|
|
|
Everything after the authority is ignored:
|
|
|
|
>>> _parse_proxy('ftp://joe:password@proxy.example.com/rubbish:3128')
|
|
('ftp', 'joe', 'password', 'proxy.example.com')
|
|
|
|
Test for no trailing '/' case:
|
|
|
|
>>> _parse_proxy('http://joe:password@proxy.example.com')
|
|
('http', 'joe', 'password', 'proxy.example.com')
|
|
|
|
"""
|
|
scheme, r_scheme = splittype(proxy)
|
|
if not r_scheme.startswith("/"):
|
|
# authority
|
|
scheme = None
|
|
authority = proxy
|
|
else:
|
|
# URL
|
|
if not r_scheme.startswith("//"):
|
|
raise ValueError("proxy URL with no authority: %r" % proxy)
|
|
# We have an authority, so for RFC 3986-compliant URLs (by ss 3.
|
|
# and 3.3.), path is empty or starts with '/'
|
|
end = r_scheme.find("/", 2)
|
|
if end == -1:
|
|
end = None
|
|
authority = r_scheme[2:end]
|
|
userinfo, hostport = splituser(authority)
|
|
if userinfo is not None:
|
|
user, password = splitpasswd(userinfo)
|
|
else:
|
|
user = password = None
|
|
return scheme, user, password, hostport
|
|
|
|
class ProxyHandler(BaseHandler):
|
|
# Proxies must be in front
|
|
handler_order = 100
|
|
|
|
def __init__(self, proxies=None):
|
|
if proxies is None:
|
|
proxies = getproxies()
|
|
assert hasattr(proxies, 'has_key'), "proxies must be a mapping"
|
|
self.proxies = proxies
|
|
for type, url in proxies.items():
|
|
setattr(self, '%s_open' % type,
|
|
lambda r, proxy=url, type=type, meth=self.proxy_open: \
|
|
meth(r, proxy, type))
|
|
|
|
def proxy_open(self, req, proxy, type):
|
|
orig_type = req.get_type()
|
|
proxy_type, user, password, hostport = _parse_proxy(proxy)
|
|
|
|
if proxy_type is None:
|
|
proxy_type = orig_type
|
|
|
|
if req.host and proxy_bypass(req.host):
|
|
return None
|
|
|
|
if user and password:
|
|
user_pass = '%s:%s' % (unquote(user), unquote(password))
|
|
creds = base64.b64encode(user_pass).strip()
|
|
req.add_header('Proxy-authorization', 'Basic ' + creds)
|
|
hostport = unquote(hostport)
|
|
req.set_proxy(hostport, proxy_type)
|
|
|
|
if orig_type == proxy_type or orig_type == 'https':
|
|
# let other handlers take care of it
|
|
return None
|
|
else:
|
|
# need to start over, because the other handlers don't
|
|
# grok the proxy's URL type
|
|
# e.g. if we have a constructor arg proxies like so:
|
|
# {'http': 'ftp://proxy.example.com'}, we may end up turning
|
|
# a request for http://acme.example.com/a into one for
|
|
# ftp://proxy.example.com/a
|
|
return self.parent.open(req, timeout=req.timeout)
|
|
|
|
class HTTPPasswordMgr:
|
|
|
|
def __init__(self):
|
|
self.passwd = {}
|
|
|
|
def add_password(self, realm, uri, user, passwd):
|
|
# uri could be a single URI or a sequence
|
|
if isinstance(uri, basestring):
|
|
uri = [uri]
|
|
if not realm in self.passwd:
|
|
self.passwd[realm] = {}
|
|
for default_port in True, False:
|
|
reduced_uri = tuple(
|
|
[self.reduce_uri(u, default_port) for u in uri])
|
|
self.passwd[realm][reduced_uri] = (user, passwd)
|
|
|
|
def find_user_password(self, realm, authuri):
|
|
domains = self.passwd.get(realm, {})
|
|
for default_port in True, False:
|
|
reduced_authuri = self.reduce_uri(authuri, default_port)
|
|
for uris, authinfo in domains.iteritems():
|
|
for uri in uris:
|
|
if self.is_suburi(uri, reduced_authuri):
|
|
return authinfo
|
|
return None, None
|
|
|
|
def reduce_uri(self, uri, default_port=True):
|
|
"""Accept authority or URI and extract only the authority and path."""
|
|
# note HTTP URLs do not have a userinfo component
|
|
parts = urlparse.urlsplit(uri)
|
|
if parts[1]:
|
|
# URI
|
|
scheme = parts[0]
|
|
authority = parts[1]
|
|
path = parts[2] or '/'
|
|
else:
|
|
# host or host:port
|
|
scheme = None
|
|
authority = uri
|
|
path = '/'
|
|
host, port = splitport(authority)
|
|
if default_port and port is None and scheme is not None:
|
|
dport = {"http": 80,
|
|
"https": 443,
|
|
}.get(scheme)
|
|
if dport is not None:
|
|
authority = "%s:%d" % (host, dport)
|
|
return authority, path
|
|
|
|
def is_suburi(self, base, test):
|
|
"""Check if test is below base in a URI tree
|
|
|
|
Both args must be URIs in reduced form.
|
|
"""
|
|
if base == test:
|
|
return True
|
|
if base[0] != test[0]:
|
|
return False
|
|
common = posixpath.commonprefix((base[1], test[1]))
|
|
if len(common) == len(base[1]):
|
|
return True
|
|
return False
|
|
|
|
|
|
class HTTPPasswordMgrWithDefaultRealm(HTTPPasswordMgr):
|
|
|
|
def find_user_password(self, realm, authuri):
|
|
user, password = HTTPPasswordMgr.find_user_password(self, realm,
|
|
authuri)
|
|
if user is not None:
|
|
return user, password
|
|
return HTTPPasswordMgr.find_user_password(self, None, authuri)
|
|
|
|
|
|
class AbstractBasicAuthHandler:
|
|
|
|
# XXX this allows for multiple auth-schemes, but will stupidly pick
|
|
# the last one with a realm specified.
|
|
|
|
# allow for double- and single-quoted realm values
|
|
# (single quotes are a violation of the RFC, but appear in the wild)
|
|
rx = re.compile('(?:.*,)*[ \t]*([^ \t]+)[ \t]+'
|
|
'realm=(["\'])(.*?)\\2', re.I)
|
|
|
|
# XXX could pre-emptively send auth info already accepted (RFC 2617,
|
|
# end of section 2, and section 1.2 immediately after "credentials"
|
|
# production).
|
|
|
|
def __init__(self, password_mgr=None):
|
|
if password_mgr is None:
|
|
password_mgr = HTTPPasswordMgr()
|
|
self.passwd = password_mgr
|
|
self.add_password = self.passwd.add_password
|
|
|
|
def http_error_auth_reqed(self, authreq, host, req, headers):
|
|
# host may be an authority (without userinfo) or a URL with an
|
|
# authority
|
|
# XXX could be multiple headers
|
|
authreq = headers.get(authreq, None)
|
|
if authreq:
|
|
mo = AbstractBasicAuthHandler.rx.search(authreq)
|
|
if mo:
|
|
scheme, quote, realm = mo.groups()
|
|
if scheme.lower() == 'basic':
|
|
return self.retry_http_basic_auth(host, req, realm)
|
|
|
|
def retry_http_basic_auth(self, host, req, realm):
|
|
user, pw = self.passwd.find_user_password(realm, host)
|
|
if pw is not None:
|
|
raw = "%s:%s" % (user, pw)
|
|
auth = 'Basic %s' % base64.b64encode(raw).strip()
|
|
if req.headers.get(self.auth_header, None) == auth:
|
|
return None
|
|
req.add_unredirected_header(self.auth_header, auth)
|
|
return self.parent.open(req, timeout=req.timeout)
|
|
else:
|
|
return None
|
|
|
|
|
|
class HTTPBasicAuthHandler(AbstractBasicAuthHandler, BaseHandler):
|
|
|
|
auth_header = 'Authorization'
|
|
|
|
def http_error_401(self, req, fp, code, msg, headers):
|
|
url = req.get_full_url()
|
|
return self.http_error_auth_reqed('www-authenticate',
|
|
url, req, headers)
|
|
|
|
|
|
class ProxyBasicAuthHandler(AbstractBasicAuthHandler, BaseHandler):
|
|
|
|
auth_header = 'Proxy-authorization'
|
|
|
|
def http_error_407(self, req, fp, code, msg, headers):
|
|
# http_error_auth_reqed requires that there is no userinfo component in
|
|
# authority. Assume there isn't one, since urllib2 does not (and
|
|
# should not, RFC 3986 s. 3.2.1) support requests for URLs containing
|
|
# userinfo.
|
|
authority = req.get_host()
|
|
return self.http_error_auth_reqed('proxy-authenticate',
|
|
authority, req, headers)
|
|
|
|
|
|
def randombytes(n):
|
|
"""Return n random bytes."""
|
|
# Use /dev/urandom if it is available. Fall back to random module
|
|
# if not. It might be worthwhile to extend this function to use
|
|
# other platform-specific mechanisms for getting random bytes.
|
|
if os.path.exists("/dev/urandom"):
|
|
f = open("/dev/urandom")
|
|
s = f.read(n)
|
|
f.close()
|
|
return s
|
|
else:
|
|
L = [chr(random.randrange(0, 256)) for i in range(n)]
|
|
return "".join(L)
|
|
|
|
class AbstractDigestAuthHandler:
|
|
# Digest authentication is specified in RFC 2617.
|
|
|
|
# XXX The client does not inspect the Authentication-Info header
|
|
# in a successful response.
|
|
|
|
# XXX It should be possible to test this implementation against
|
|
# a mock server that just generates a static set of challenges.
|
|
|
|
# XXX qop="auth-int" supports is shaky
|
|
|
|
def __init__(self, passwd=None):
|
|
if passwd is None:
|
|
passwd = HTTPPasswordMgr()
|
|
self.passwd = passwd
|
|
self.add_password = self.passwd.add_password
|
|
self.retried = 0
|
|
self.nonce_count = 0
|
|
self.last_nonce = None
|
|
|
|
def reset_retry_count(self):
|
|
self.retried = 0
|
|
|
|
def http_error_auth_reqed(self, auth_header, host, req, headers):
|
|
authreq = headers.get(auth_header, None)
|
|
if self.retried > 5:
|
|
# Don't fail endlessly - if we failed once, we'll probably
|
|
# fail a second time. Hm. Unless the Password Manager is
|
|
# prompting for the information. Crap. This isn't great
|
|
# but it's better than the current 'repeat until recursion
|
|
# depth exceeded' approach <wink>
|
|
raise HTTPError(req.get_full_url(), 401, "digest auth failed",
|
|
headers, None)
|
|
else:
|
|
self.retried += 1
|
|
if authreq:
|
|
scheme = authreq.split()[0]
|
|
if scheme.lower() == 'digest':
|
|
return self.retry_http_digest_auth(req, authreq)
|
|
|
|
def retry_http_digest_auth(self, req, auth):
|
|
token, challenge = auth.split(' ', 1)
|
|
chal = parse_keqv_list(parse_http_list(challenge))
|
|
auth = self.get_authorization(req, chal)
|
|
if auth:
|
|
auth_val = 'Digest %s' % auth
|
|
if req.headers.get(self.auth_header, None) == auth_val:
|
|
return None
|
|
req.add_unredirected_header(self.auth_header, auth_val)
|
|
resp = self.parent.open(req, timeout=req.timeout)
|
|
return resp
|
|
|
|
def get_cnonce(self, nonce):
|
|
# The cnonce-value is an opaque
|
|
# quoted string value provided by the client and used by both client
|
|
# and server to avoid chosen plaintext attacks, to provide mutual
|
|
# authentication, and to provide some message integrity protection.
|
|
# This isn't a fabulous effort, but it's probably Good Enough.
|
|
dig = hashlib.sha1("%s:%s:%s:%s" % (self.nonce_count, nonce, time.ctime(),
|
|
randombytes(8))).hexdigest()
|
|
return dig[:16]
|
|
|
|
def get_authorization(self, req, chal):
|
|
try:
|
|
realm = chal['realm']
|
|
nonce = chal['nonce']
|
|
qop = chal.get('qop')
|
|
algorithm = chal.get('algorithm', 'MD5')
|
|
# mod_digest doesn't send an opaque, even though it isn't
|
|
# supposed to be optional
|
|
opaque = chal.get('opaque', None)
|
|
except KeyError:
|
|
return None
|
|
|
|
H, KD = self.get_algorithm_impls(algorithm)
|
|
if H is None:
|
|
return None
|
|
|
|
user, pw = self.passwd.find_user_password(realm, req.get_full_url())
|
|
if user is None:
|
|
return None
|
|
|
|
# XXX not implemented yet
|
|
if req.has_data():
|
|
entdig = self.get_entity_digest(req.get_data(), chal)
|
|
else:
|
|
entdig = None
|
|
|
|
A1 = "%s:%s:%s" % (user, realm, pw)
|
|
A2 = "%s:%s" % (req.get_method(),
|
|
# XXX selector: what about proxies and full urls
|
|
req.get_selector())
|
|
if qop == 'auth':
|
|
if nonce == self.last_nonce:
|
|
self.nonce_count += 1
|
|
else:
|
|
self.nonce_count = 1
|
|
self.last_nonce = nonce
|
|
|
|
ncvalue = '%08x' % self.nonce_count
|
|
cnonce = self.get_cnonce(nonce)
|
|
noncebit = "%s:%s:%s:%s:%s" % (nonce, ncvalue, cnonce, qop, H(A2))
|
|
respdig = KD(H(A1), noncebit)
|
|
elif qop is None:
|
|
respdig = KD(H(A1), "%s:%s" % (nonce, H(A2)))
|
|
else:
|
|
# XXX handle auth-int.
|
|
raise URLError("qop '%s' is not supported." % qop)
|
|
|
|
# XXX should the partial digests be encoded too?
|
|
|
|
base = 'username="%s", realm="%s", nonce="%s", uri="%s", ' \
|
|
'response="%s"' % (user, realm, nonce, req.get_selector(),
|
|
respdig)
|
|
if opaque:
|
|
base += ', opaque="%s"' % opaque
|
|
if entdig:
|
|
base += ', digest="%s"' % entdig
|
|
base += ', algorithm="%s"' % algorithm
|
|
if qop:
|
|
base += ', qop=auth, nc=%s, cnonce="%s"' % (ncvalue, cnonce)
|
|
return base
|
|
|
|
def get_algorithm_impls(self, algorithm):
|
|
# algorithm should be case-insensitive according to RFC2617
|
|
algorithm = algorithm.upper()
|
|
# lambdas assume digest modules are imported at the top level
|
|
if algorithm == 'MD5':
|
|
H = lambda x: hashlib.md5(x).hexdigest()
|
|
elif algorithm == 'SHA':
|
|
H = lambda x: hashlib.sha1(x).hexdigest()
|
|
# XXX MD5-sess
|
|
KD = lambda s, d: H("%s:%s" % (s, d))
|
|
return H, KD
|
|
|
|
def get_entity_digest(self, data, chal):
|
|
# XXX not implemented yet
|
|
return None
|
|
|
|
|
|
class HTTPDigestAuthHandler(BaseHandler, AbstractDigestAuthHandler):
|
|
"""An authentication protocol defined by RFC 2069
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Digest authentication improves on basic authentication because it
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does not transmit passwords in the clear.
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"""
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auth_header = 'Authorization'
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handler_order = 490 # before Basic auth
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def http_error_401(self, req, fp, code, msg, headers):
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host = urlparse.urlparse(req.get_full_url())[1]
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retry = self.http_error_auth_reqed('www-authenticate',
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host, req, headers)
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self.reset_retry_count()
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return retry
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class ProxyDigestAuthHandler(BaseHandler, AbstractDigestAuthHandler):
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auth_header = 'Proxy-Authorization'
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handler_order = 490 # before Basic auth
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def http_error_407(self, req, fp, code, msg, headers):
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host = req.get_host()
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retry = self.http_error_auth_reqed('proxy-authenticate',
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host, req, headers)
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self.reset_retry_count()
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return retry
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class AbstractHTTPHandler(BaseHandler):
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def __init__(self, debuglevel=0):
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self._debuglevel = debuglevel
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def set_http_debuglevel(self, level):
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self._debuglevel = level
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def do_request_(self, request):
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host = request.get_host()
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if not host:
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raise URLError('no host given')
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if request.has_data(): # POST
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data = request.get_data()
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if not request.has_header('Content-type'):
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request.add_unredirected_header(
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'Content-type',
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'application/x-www-form-urlencoded')
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if not request.has_header('Content-length'):
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request.add_unredirected_header(
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'Content-length', '%d' % len(data))
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sel_host = host
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if request.has_proxy():
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scheme, sel = splittype(request.get_selector())
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sel_host, sel_path = splithost(sel)
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if not request.has_header('Host'):
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request.add_unredirected_header('Host', sel_host)
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for name, value in self.parent.addheaders:
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name = name.capitalize()
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if not request.has_header(name):
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request.add_unredirected_header(name, value)
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return request
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def do_open(self, http_class, req):
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"""Return an addinfourl object for the request, using http_class.
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http_class must implement the HTTPConnection API from httplib.
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The addinfourl return value is a file-like object. It also
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has methods and attributes including:
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- info(): return a mimetools.Message object for the headers
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- geturl(): return the original request URL
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- code: HTTP status code
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"""
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host = req.get_host()
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if not host:
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raise URLError('no host given')
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h = http_class(host, timeout=req.timeout) # will parse host:port
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h.set_debuglevel(self._debuglevel)
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headers = dict(req.headers)
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headers.update(req.unredirected_hdrs)
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# We want to make an HTTP/1.1 request, but the addinfourl
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# class isn't prepared to deal with a persistent connection.
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# It will try to read all remaining data from the socket,
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# which will block while the server waits for the next request.
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# So make sure the connection gets closed after the (only)
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# request.
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headers["Connection"] = "close"
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headers = dict(
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(name.title(), val) for name, val in headers.items())
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if req._tunnel_host:
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tunnel_headers = {}
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proxy_auth_hdr = "Proxy-Authorization"
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if proxy_auth_hdr in headers:
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tunnel_headers[proxy_auth_hdr] = headers[proxy_auth_hdr]
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# Proxy-Authorization should not be sent to origin
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# server.
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del headers[proxy_auth_hdr]
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h._set_tunnel(req._tunnel_host, headers=tunnel_headers)
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try:
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h.request(req.get_method(), req.get_selector(), req.data, headers)
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r = h.getresponse()
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except socket.error, err: # XXX what error?
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raise URLError(err)
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# Pick apart the HTTPResponse object to get the addinfourl
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# object initialized properly.
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# Wrap the HTTPResponse object in socket's file object adapter
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# for Windows. That adapter calls recv(), so delegate recv()
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# to read(). This weird wrapping allows the returned object to
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# have readline() and readlines() methods.
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# XXX It might be better to extract the read buffering code
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# out of socket._fileobject() and into a base class.
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r.recv = r.read
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fp = socket._fileobject(r, close=True)
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resp = addinfourl(fp, r.msg, req.get_full_url())
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resp.code = r.status
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resp.msg = r.reason
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return resp
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class HTTPHandler(AbstractHTTPHandler):
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def http_open(self, req):
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return self.do_open(httplib.HTTPConnection, req)
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http_request = AbstractHTTPHandler.do_request_
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if hasattr(httplib, 'HTTPS'):
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class HTTPSHandler(AbstractHTTPHandler):
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def https_open(self, req):
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return self.do_open(httplib.HTTPSConnection, req)
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https_request = AbstractHTTPHandler.do_request_
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class HTTPCookieProcessor(BaseHandler):
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def __init__(self, cookiejar=None):
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import cookielib
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if cookiejar is None:
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cookiejar = cookielib.CookieJar()
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self.cookiejar = cookiejar
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def http_request(self, request):
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self.cookiejar.add_cookie_header(request)
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return request
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def http_response(self, request, response):
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self.cookiejar.extract_cookies(response, request)
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return response
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https_request = http_request
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https_response = http_response
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class UnknownHandler(BaseHandler):
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def unknown_open(self, req):
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type = req.get_type()
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raise URLError('unknown url type: %s' % type)
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def parse_keqv_list(l):
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"""Parse list of key=value strings where keys are not duplicated."""
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parsed = {}
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for elt in l:
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k, v = elt.split('=', 1)
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if v[0] == '"' and v[-1] == '"':
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v = v[1:-1]
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parsed[k] = v
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return parsed
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def parse_http_list(s):
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"""Parse lists as described by RFC 2068 Section 2.
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In particular, parse comma-separated lists where the elements of
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the list may include quoted-strings. A quoted-string could
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contain a comma. A non-quoted string could have quotes in the
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middle. Neither commas nor quotes count if they are escaped.
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Only double-quotes count, not single-quotes.
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"""
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res = []
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part = ''
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escape = quote = False
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for cur in s:
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if escape:
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part += cur
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escape = False
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continue
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if quote:
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if cur == '\\':
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escape = True
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continue
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elif cur == '"':
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quote = False
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part += cur
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continue
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if cur == ',':
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res.append(part)
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part = ''
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continue
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if cur == '"':
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quote = True
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part += cur
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# append last part
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if part:
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res.append(part)
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return [part.strip() for part in res]
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class FileHandler(BaseHandler):
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# Use local file or FTP depending on form of URL
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def file_open(self, req):
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url = req.get_selector()
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if url[:2] == '//' and url[2:3] != '/':
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req.type = 'ftp'
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return self.parent.open(req)
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else:
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return self.open_local_file(req)
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# names for the localhost
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names = None
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def get_names(self):
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if FileHandler.names is None:
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try:
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FileHandler.names = tuple(
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socket.gethostbyname_ex('localhost')[2] +
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socket.gethostbyname_ex(socket.gethostname())[2])
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except socket.gaierror:
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FileHandler.names = (socket.gethostbyname('localhost'),)
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return FileHandler.names
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# not entirely sure what the rules are here
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def open_local_file(self, req):
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import email.utils
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import mimetypes
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host = req.get_host()
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filename = req.get_selector()
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localfile = url2pathname(filename)
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try:
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stats = os.stat(localfile)
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size = stats.st_size
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modified = email.utils.formatdate(stats.st_mtime, usegmt=True)
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mtype = mimetypes.guess_type(filename)[0]
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headers = mimetools.Message(StringIO(
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'Content-type: %s\nContent-length: %d\nLast-modified: %s\n' %
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(mtype or 'text/plain', size, modified)))
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if host:
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host, port = splitport(host)
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if not host or \
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(not port and socket.gethostbyname(host) in self.get_names()):
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if host:
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origurl = 'file://' + host + filename
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else:
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origurl = 'file://' + filename
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return addinfourl(open(localfile, 'rb'), headers, origurl)
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except OSError, msg:
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# urllib2 users shouldn't expect OSErrors coming from urlopen()
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raise URLError(msg)
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raise URLError('file not on local host')
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class FTPHandler(BaseHandler):
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def ftp_open(self, req):
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import ftplib
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import mimetypes
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host = req.get_host()
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if not host:
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raise URLError('ftp error: no host given')
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host, port = splitport(host)
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if port is None:
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port = ftplib.FTP_PORT
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else:
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port = int(port)
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# username/password handling
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user, host = splituser(host)
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if user:
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user, passwd = splitpasswd(user)
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else:
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passwd = None
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host = unquote(host)
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user = unquote(user or '')
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passwd = unquote(passwd or '')
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try:
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host = socket.gethostbyname(host)
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except socket.error, msg:
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raise URLError(msg)
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path, attrs = splitattr(req.get_selector())
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dirs = path.split('/')
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dirs = map(unquote, dirs)
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dirs, file = dirs[:-1], dirs[-1]
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if dirs and not dirs[0]:
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dirs = dirs[1:]
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try:
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fw = self.connect_ftp(user, passwd, host, port, dirs, req.timeout)
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type = file and 'I' or 'D'
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for attr in attrs:
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attr, value = splitvalue(attr)
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if attr.lower() == 'type' and \
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value in ('a', 'A', 'i', 'I', 'd', 'D'):
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type = value.upper()
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fp, retrlen = fw.retrfile(file, type)
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headers = ""
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mtype = mimetypes.guess_type(req.get_full_url())[0]
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if mtype:
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headers += "Content-type: %s\n" % mtype
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if retrlen is not None and retrlen >= 0:
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headers += "Content-length: %d\n" % retrlen
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sf = StringIO(headers)
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headers = mimetools.Message(sf)
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return addinfourl(fp, headers, req.get_full_url())
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except ftplib.all_errors, msg:
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raise URLError, ('ftp error: %s' % msg), sys.exc_info()[2]
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|
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def connect_ftp(self, user, passwd, host, port, dirs, timeout):
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fw = ftpwrapper(user, passwd, host, port, dirs, timeout)
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## fw.ftp.set_debuglevel(1)
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return fw
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class CacheFTPHandler(FTPHandler):
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# XXX would be nice to have pluggable cache strategies
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# XXX this stuff is definitely not thread safe
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def __init__(self):
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self.cache = {}
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self.timeout = {}
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self.soonest = 0
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self.delay = 60
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self.max_conns = 16
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def setTimeout(self, t):
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self.delay = t
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def setMaxConns(self, m):
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self.max_conns = m
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def connect_ftp(self, user, passwd, host, port, dirs, timeout):
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key = user, host, port, '/'.join(dirs), timeout
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if key in self.cache:
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self.timeout[key] = time.time() + self.delay
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else:
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self.cache[key] = ftpwrapper(user, passwd, host, port, dirs, timeout)
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self.timeout[key] = time.time() + self.delay
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self.check_cache()
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return self.cache[key]
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def check_cache(self):
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# first check for old ones
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t = time.time()
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if self.soonest <= t:
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for k, v in self.timeout.items():
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if v < t:
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self.cache[k].close()
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del self.cache[k]
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del self.timeout[k]
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self.soonest = min(self.timeout.values())
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|
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# then check the size
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if len(self.cache) == self.max_conns:
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for k, v in self.timeout.items():
|
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if v == self.soonest:
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del self.cache[k]
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del self.timeout[k]
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break
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self.soonest = min(self.timeout.values())
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