mirror of
https://github.com/python/cpython.git
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09c8b6c3e4
Brian E Gallew, which were improved and adapted to OpenSSL 0.9.4 by Laszlo Kovacs of HP. Both have kindly given permission to include the patches in the Python distribution. Final formatting by GvR.
1121 lines
36 KiB
Python
1121 lines
36 KiB
Python
# Open an arbitrary URL
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#
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# See the following document for more info on URLs:
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# "Names and Addresses, URIs, URLs, URNs, URCs", at
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# http://www.w3.org/pub/WWW/Addressing/Overview.html
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#
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# See also the HTTP spec (from which the error codes are derived):
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# "HTTP - Hypertext Transfer Protocol", at
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# http://www.w3.org/pub/WWW/Protocols/
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#
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# Related standards and specs:
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# - RFC1808: the "relative URL" spec. (authoritative status)
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# - RFC1738 - the "URL standard". (authoritative status)
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# - RFC1630 - the "URI spec". (informational status)
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#
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# The object returned by URLopener().open(file) will differ per
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# protocol. All you know is that is has methods read(), readline(),
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# readlines(), fileno(), close() and info(). The read*(), fileno()
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# and close() methods work like those of open files.
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# The info() method returns a mimetools.Message object which can be
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# used to query various info about the object, if available.
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# (mimetools.Message objects are queried with the getheader() method.)
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import string
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import socket
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import os
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import sys
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__version__ = '1.12' # XXX This version is not always updated :-(
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MAXFTPCACHE = 10 # Trim the ftp cache beyond this size
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# Helper for non-unix systems
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if os.name == 'mac':
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from macurl2path import url2pathname, pathname2url
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elif os.name == 'nt':
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from nturl2path import url2pathname, pathname2url
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else:
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def url2pathname(pathname):
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return unquote(pathname)
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def pathname2url(pathname):
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return quote(pathname)
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# This really consists of two pieces:
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# (1) a class which handles opening of all sorts of URLs
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# (plus assorted utilities etc.)
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# (2) a set of functions for parsing URLs
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# XXX Should these be separated out into different modules?
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# Shortcut for basic usage
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_urlopener = None
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def urlopen(url, data=None):
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global _urlopener
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if not _urlopener:
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_urlopener = FancyURLopener()
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if data is None:
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return _urlopener.open(url)
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else:
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return _urlopener.open(url, data)
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def urlretrieve(url, filename=None, reporthook=None):
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global _urlopener
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if not _urlopener:
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_urlopener = FancyURLopener()
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return _urlopener.retrieve(url, filename, reporthook)
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def urlcleanup():
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if _urlopener:
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_urlopener.cleanup()
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# Class to open URLs.
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# This is a class rather than just a subroutine because we may need
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# more than one set of global protocol-specific options.
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# Note -- this is a base class for those who don't want the
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# automatic handling of errors type 302 (relocated) and 401
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# (authorization needed).
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ftpcache = {}
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class URLopener:
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__tempfiles = None
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# Constructor
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def __init__(self, proxies=None, **x509):
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if proxies is None:
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proxies = getproxies()
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assert hasattr(proxies, 'has_key'), "proxies must be a mapping"
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self.proxies = proxies
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self.key_file = x509.get('key_file')
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self.cert_file = x509.get('cert_file')
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server_version = "Python-urllib/%s" % __version__
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self.addheaders = [('User-agent', server_version)]
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self.__tempfiles = []
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self.__unlink = os.unlink # See cleanup()
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self.tempcache = None
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# Undocumented feature: if you assign {} to tempcache,
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# it is used to cache files retrieved with
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# self.retrieve(). This is not enabled by default
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# since it does not work for changing documents (and I
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# haven't got the logic to check expiration headers
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# yet).
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self.ftpcache = ftpcache
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# Undocumented feature: you can use a different
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# ftp cache by assigning to the .ftpcache member;
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# in case you want logically independent URL openers
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# XXX This is not threadsafe. Bah.
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def __del__(self):
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self.close()
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def close(self):
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self.cleanup()
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def cleanup(self):
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# This code sometimes runs when the rest of this module
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# has already been deleted, so it can't use any globals
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# or import anything.
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if self.__tempfiles:
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for file in self.__tempfiles:
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try:
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self.__unlink(file)
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except:
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pass
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del self.__tempfiles[:]
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if self.tempcache:
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self.tempcache.clear()
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# Add a header to be used by the HTTP interface only
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# e.g. u.addheader('Accept', 'sound/basic')
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def addheader(self, *args):
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self.addheaders.append(args)
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# External interface
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# Use URLopener().open(file) instead of open(file, 'r')
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def open(self, fullurl, data=None):
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fullurl = unwrap(fullurl)
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if self.tempcache and self.tempcache.has_key(fullurl):
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filename, headers = self.tempcache[fullurl]
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fp = open(filename, 'rb')
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return addinfourl(fp, headers, fullurl)
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type, url = splittype(fullurl)
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if not type: type = 'file'
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if self.proxies.has_key(type):
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proxy = self.proxies[type]
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type, proxy = splittype(proxy)
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host, selector = splithost(proxy)
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url = (host, fullurl) # Signal special case to open_*()
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name = 'open_' + type
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self.type = type
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if '-' in name:
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# replace - with _
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name = string.join(string.split(name, '-'), '_')
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if not hasattr(self, name):
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if data is None:
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return self.open_unknown(fullurl)
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else:
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return self.open_unknown(fullurl, data)
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try:
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if data is None:
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return getattr(self, name)(url)
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else:
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return getattr(self, name)(url, data)
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except socket.error, msg:
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raise IOError, ('socket error', msg), sys.exc_info()[2]
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# Overridable interface to open unknown URL type
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def open_unknown(self, fullurl, data=None):
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type, url = splittype(fullurl)
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raise IOError, ('url error', 'unknown url type', type)
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# External interface
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# retrieve(url) returns (filename, None) for a local object
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# or (tempfilename, headers) for a remote object
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def retrieve(self, url, filename=None, reporthook=None):
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url = unwrap(url)
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if self.tempcache and self.tempcache.has_key(url):
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return self.tempcache[url]
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type, url1 = splittype(url)
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if not filename and (not type or type == 'file'):
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try:
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fp = self.open_local_file(url1)
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hdrs = fp.info()
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del fp
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return url2pathname(splithost(url1)[1]), hdrs
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except IOError, msg:
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pass
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fp = self.open(url)
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headers = fp.info()
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if not filename:
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import tempfile
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garbage, path = splittype(url)
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garbage, path = splithost(path or "")
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path, garbage = splitquery(path or "")
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path, garbage = splitattr(path or "")
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suffix = os.path.splitext(path)[1]
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filename = tempfile.mktemp(suffix)
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self.__tempfiles.append(filename)
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result = filename, headers
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if self.tempcache is not None:
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self.tempcache[url] = result
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tfp = open(filename, 'wb')
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bs = 1024*8
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size = -1
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blocknum = 1
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if reporthook:
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if headers.has_key("content-length"):
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size = int(headers["Content-Length"])
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reporthook(0, bs, size)
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block = fp.read(bs)
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if reporthook:
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reporthook(1, bs, size)
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while block:
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tfp.write(block)
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block = fp.read(bs)
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blocknum = blocknum + 1
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if reporthook:
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reporthook(blocknum, bs, size)
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fp.close()
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tfp.close()
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del fp
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del tfp
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return result
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# Each method named open_<type> knows how to open that type of URL
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# Use HTTP protocol
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def open_http(self, url, data=None):
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import httplib
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user_passwd = None
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if type(url) is type(""):
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host, selector = splithost(url)
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if host:
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user_passwd, host = splituser(host)
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host = unquote(host)
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realhost = host
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else:
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host, selector = url
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urltype, rest = splittype(selector)
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url = rest
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user_passwd = None
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if string.lower(urltype) != 'http':
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realhost = None
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else:
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realhost, rest = splithost(rest)
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if realhost:
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user_passwd, realhost = splituser(realhost)
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if user_passwd:
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selector = "%s://%s%s" % (urltype, realhost, rest)
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#print "proxy via http:", host, selector
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if not host: raise IOError, ('http error', 'no host given')
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if user_passwd:
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import base64
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auth = string.strip(base64.encodestring(user_passwd))
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else:
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auth = None
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h = httplib.HTTP(host)
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if data is not None:
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h.putrequest('POST', selector)
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h.putheader('Content-type', 'application/x-www-form-urlencoded')
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h.putheader('Content-length', '%d' % len(data))
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else:
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h.putrequest('GET', selector)
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if auth: h.putheader('Authorization', 'Basic %s' % auth)
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if realhost: h.putheader('Host', realhost)
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for args in self.addheaders: apply(h.putheader, args)
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h.endheaders()
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if data is not None:
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h.send(data + '\r\n')
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errcode, errmsg, headers = h.getreply()
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fp = h.getfile()
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if errcode == 200:
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return addinfourl(fp, headers, "http:" + url)
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else:
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if data is None:
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return self.http_error(url, fp, errcode, errmsg, headers)
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else:
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return self.http_error(url, fp, errcode, errmsg, headers, data)
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# Handle http errors.
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# Derived class can override this, or provide specific handlers
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# named http_error_DDD where DDD is the 3-digit error code
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def http_error(self, url, fp, errcode, errmsg, headers, data=None):
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# First check if there's a specific handler for this error
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name = 'http_error_%d' % errcode
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if hasattr(self, name):
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method = getattr(self, name)
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if data is None:
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result = method(url, fp, errcode, errmsg, headers)
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else:
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result = method(url, fp, errcode, errmsg, headers, data)
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if result: return result
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return self.http_error_default(url, fp, errcode, errmsg, headers)
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# Default http error handler: close the connection and raises IOError
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def http_error_default(self, url, fp, errcode, errmsg, headers):
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void = fp.read()
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fp.close()
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raise IOError, ('http error', errcode, errmsg, headers)
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# Use HTTPS protocol
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if hasattr(socket, "ssl"):
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def open_https(self, url):
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import httplib
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if type(url) is type(""):
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host, selector = splithost(url)
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user_passwd, host = splituser(host)
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else:
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host, selector = url
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urltype, rest = splittype(selector)
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if string.lower(urltype) == 'https':
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realhost, rest = splithost(rest)
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user_passwd, realhost = splituser(realhost)
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if user_passwd:
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selector = "%s://%s%s" % (urltype, realhost, rest)
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print "proxy via https:", host, selector
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if not host: raise IOError, ('https error', 'no host given')
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if user_passwd:
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import base64
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auth = string.strip(base64.encodestring(user_passwd))
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else:
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auth = None
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h = httplib.HTTPS(host, 0,
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key_file=self.key_file,
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cert_file=self.cert_file)
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h.putrequest('GET', selector)
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if auth: h.putheader('Authorization: Basic %s' % auth)
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for args in self.addheaders: apply(h.putheader, args)
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h.endheaders()
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errcode, errmsg, headers = h.getreply()
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fp = h.getfile()
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if errcode == 200:
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return addinfourl(fp, headers, url)
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else:
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return self.http_error(url, fp, errcode, errmsg, headers)
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# Use Gopher protocol
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def open_gopher(self, url):
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import gopherlib
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host, selector = splithost(url)
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if not host: raise IOError, ('gopher error', 'no host given')
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host = unquote(host)
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type, selector = splitgophertype(selector)
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selector, query = splitquery(selector)
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selector = unquote(selector)
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if query:
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query = unquote(query)
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fp = gopherlib.send_query(selector, query, host)
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else:
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fp = gopherlib.send_selector(selector, host)
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return addinfourl(fp, noheaders(), "gopher:" + url)
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# Use local file or FTP depending on form of URL
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def open_file(self, url):
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if url[:2] == '//' and url[2:3] != '/':
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return self.open_ftp(url)
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else:
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return self.open_local_file(url)
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# Use local file
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def open_local_file(self, url):
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import mimetypes, mimetools, StringIO
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mtype = mimetypes.guess_type(url)[0]
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headers = mimetools.Message(StringIO.StringIO(
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'Content-Type: %s\n' % (mtype or 'text/plain')))
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host, file = splithost(url)
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if not host:
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urlfile = file
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if file[:1] == '/':
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urlfile = 'file://' + file
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return addinfourl(open(url2pathname(file), 'rb'),
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headers, urlfile)
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host, port = splitport(host)
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if not port \
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and socket.gethostbyname(host) in (localhost(), thishost()):
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urlfile = file
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if file[:1] == '/':
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urlfile = 'file://' + file
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return addinfourl(open(url2pathname(file), 'rb'),
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headers, urlfile)
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raise IOError, ('local file error', 'not on local host')
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# Use FTP protocol
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def open_ftp(self, url):
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host, path = splithost(url)
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if not host: raise IOError, ('ftp error', 'no host given')
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host, port = splitport(host)
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user, host = splituser(host)
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if user: user, passwd = splitpasswd(user)
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else: 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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host = socket.gethostbyname(host)
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if not port:
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import ftplib
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port = ftplib.FTP_PORT
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else:
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port = int(port)
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path, attrs = splitattr(path)
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path = unquote(path)
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dirs = string.splitfields(path, '/')
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dirs, file = dirs[:-1], dirs[-1]
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if dirs and not dirs[0]: dirs = dirs[1:]
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if dirs and not dirs[0]: dirs[0] = '/'
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key = (user, host, port, string.joinfields(dirs, '/'))
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# XXX thread unsafe!
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if len(self.ftpcache) > MAXFTPCACHE:
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# Prune the cache, rather arbitrarily
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for k in self.ftpcache.keys():
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if k != key:
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v = self.ftpcache[k]
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del self.ftpcache[k]
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v.close()
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try:
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if not self.ftpcache.has_key(key):
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self.ftpcache[key] = \
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ftpwrapper(user, passwd, host, port, dirs)
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if not file: type = 'D'
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else: type = 'I'
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for attr in attrs:
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attr, value = splitvalue(attr)
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if string.lower(attr) == 'type' and \
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value in ('a', 'A', 'i', 'I', 'd', 'D'):
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type = string.upper(value)
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(fp, retrlen) = self.ftpcache[key].retrfile(file, type)
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if retrlen is not None and retrlen >= 0:
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import mimetools, StringIO
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headers = mimetools.Message(StringIO.StringIO(
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'Content-Length: %d\n' % retrlen))
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else:
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headers = noheaders()
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return addinfourl(fp, headers, "ftp:" + url)
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except ftperrors(), msg:
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raise IOError, ('ftp error', msg), sys.exc_info()[2]
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|
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# Use "data" URL
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def open_data(self, url, data=None):
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# ignore POSTed data
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#
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# syntax of data URLs:
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# dataurl := "data:" [ mediatype ] [ ";base64" ] "," data
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# mediatype := [ type "/" subtype ] *( ";" parameter )
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|
# data := *urlchar
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# parameter := attribute "=" value
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import StringIO, mimetools, time
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try:
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[type, data] = string.split(url, ',', 1)
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except ValueError:
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raise IOError, ('data error', 'bad data URL')
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if not type:
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type = 'text/plain;charset=US-ASCII'
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semi = string.rfind(type, ';')
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if semi >= 0 and '=' not in type[semi:]:
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encoding = type[semi+1:]
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type = type[:semi]
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else:
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encoding = ''
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msg = []
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msg.append('Date: %s'%time.strftime('%a, %d %b %Y %T GMT',
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time.gmtime(time.time())))
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msg.append('Content-type: %s' % type)
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if encoding == 'base64':
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import base64
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data = base64.decodestring(data)
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else:
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data = unquote(data)
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msg.append('Content-length: %d' % len(data))
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msg.append('')
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msg.append(data)
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msg = string.join(msg, '\n')
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f = StringIO.StringIO(msg)
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headers = mimetools.Message(f, 0)
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f.fileno = None # needed for addinfourl
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return addinfourl(f, headers, url)
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|
|
|
|
# Derived class with handlers for errors we can handle (perhaps)
|
|
class FancyURLopener(URLopener):
|
|
|
|
def __init__(self, *args):
|
|
apply(URLopener.__init__, (self,) + args)
|
|
self.auth_cache = {}
|
|
|
|
# Default error handling -- don't raise an exception
|
|
def http_error_default(self, url, fp, errcode, errmsg, headers):
|
|
return addinfourl(fp, headers, "http:" + url)
|
|
|
|
# Error 302 -- relocated (temporarily)
|
|
def http_error_302(self, url, fp, errcode, errmsg, headers,
|
|
data=None):
|
|
# XXX The server can force infinite recursion here!
|
|
if headers.has_key('location'):
|
|
newurl = headers['location']
|
|
elif headers.has_key('uri'):
|
|
newurl = headers['uri']
|
|
else:
|
|
return
|
|
void = fp.read()
|
|
fp.close()
|
|
# In case the server sent a relative URL, join with original:
|
|
newurl = basejoin("http:" + url, newurl)
|
|
return self.open(newurl, data)
|
|
|
|
# Error 301 -- also relocated (permanently)
|
|
http_error_301 = http_error_302
|
|
|
|
# Error 401 -- authentication required
|
|
# See this URL for a description of the basic authentication scheme:
|
|
# http://www.ics.uci.edu/pub/ietf/http/draft-ietf-http-v10-spec-00.txt
|
|
def http_error_401(self, url, fp, errcode, errmsg, headers,
|
|
data=None):
|
|
if headers.has_key('www-authenticate'):
|
|
stuff = headers['www-authenticate']
|
|
import re
|
|
match = re.match('[ \t]*([^ \t]+)[ \t]+realm="([^"]*)"', stuff)
|
|
if match:
|
|
scheme, realm = match.groups()
|
|
if string.lower(scheme) == 'basic':
|
|
name = 'retry_' + self.type + '_basic_auth'
|
|
return getattr(self,name)(url, realm)
|
|
|
|
def retry_http_basic_auth(self, url, realm, data):
|
|
host, selector = splithost(url)
|
|
i = string.find(host, '@') + 1
|
|
host = host[i:]
|
|
user, passwd = self.get_user_passwd(host, realm, i)
|
|
if not (user or passwd): return None
|
|
host = user + ':' + passwd + '@' + host
|
|
newurl = 'http://' + host + selector
|
|
return self.open(newurl, data)
|
|
|
|
def retry_https_basic_auth(self, url, realm):
|
|
host, selector = splithost(url)
|
|
i = string.find(host, '@') + 1
|
|
host = host[i:]
|
|
user, passwd = self.get_user_passwd(host, realm, i)
|
|
if not (user or passwd): return None
|
|
host = user + ':' + passwd + '@' + host
|
|
newurl = '//' + host + selector
|
|
return self.open_https(newurl)
|
|
|
|
def get_user_passwd(self, host, realm, clear_cache = 0):
|
|
key = realm + '@' + string.lower(host)
|
|
if self.auth_cache.has_key(key):
|
|
if clear_cache:
|
|
del self.auth_cache[key]
|
|
else:
|
|
return self.auth_cache[key]
|
|
user, passwd = self.prompt_user_passwd(host, realm)
|
|
if user or passwd: self.auth_cache[key] = (user, passwd)
|
|
return user, passwd
|
|
|
|
def prompt_user_passwd(self, host, realm):
|
|
# Override this in a GUI environment!
|
|
import getpass
|
|
try:
|
|
user = raw_input("Enter username for %s at %s: " % (realm,
|
|
host))
|
|
passwd = getpass.getpass("Enter password for %s in %s at %s: " %
|
|
(user, realm, host))
|
|
return user, passwd
|
|
except KeyboardInterrupt:
|
|
print
|
|
return None, None
|
|
|
|
|
|
# Utility functions
|
|
|
|
# Return the IP address of the magic hostname 'localhost'
|
|
_localhost = None
|
|
def localhost():
|
|
global _localhost
|
|
if not _localhost:
|
|
_localhost = socket.gethostbyname('localhost')
|
|
return _localhost
|
|
|
|
# Return the IP address of the current host
|
|
_thishost = None
|
|
def thishost():
|
|
global _thishost
|
|
if not _thishost:
|
|
_thishost = socket.gethostbyname(socket.gethostname())
|
|
return _thishost
|
|
|
|
# Return the set of errors raised by the FTP class
|
|
_ftperrors = None
|
|
def ftperrors():
|
|
global _ftperrors
|
|
if not _ftperrors:
|
|
import ftplib
|
|
_ftperrors = ftplib.all_errors
|
|
return _ftperrors
|
|
|
|
# Return an empty mimetools.Message object
|
|
_noheaders = None
|
|
def noheaders():
|
|
global _noheaders
|
|
if not _noheaders:
|
|
import mimetools
|
|
import StringIO
|
|
_noheaders = mimetools.Message(StringIO.StringIO(), 0)
|
|
_noheaders.fp.close() # Recycle file descriptor
|
|
return _noheaders
|
|
|
|
|
|
# Utility classes
|
|
|
|
# Class used by open_ftp() for cache of open FTP connections
|
|
class ftpwrapper:
|
|
def __init__(self, user, passwd, host, port, dirs):
|
|
self.user = user
|
|
self.passwd = passwd
|
|
self.host = host
|
|
self.port = port
|
|
self.dirs = dirs
|
|
self.init()
|
|
def init(self):
|
|
import ftplib
|
|
self.busy = 0
|
|
self.ftp = ftplib.FTP()
|
|
self.ftp.connect(self.host, self.port)
|
|
self.ftp.login(self.user, self.passwd)
|
|
for dir in self.dirs:
|
|
self.ftp.cwd(dir)
|
|
def retrfile(self, file, type):
|
|
import ftplib
|
|
self.endtransfer()
|
|
if type in ('d', 'D'): cmd = 'TYPE A'; isdir = 1
|
|
else: cmd = 'TYPE ' + type; isdir = 0
|
|
try:
|
|
self.ftp.voidcmd(cmd)
|
|
except ftplib.all_errors:
|
|
self.init()
|
|
self.ftp.voidcmd(cmd)
|
|
conn = None
|
|
if file and not isdir:
|
|
# Use nlst to see if the file exists at all
|
|
try:
|
|
self.ftp.nlst(file)
|
|
except ftplib.error_perm, reason:
|
|
raise IOError, ('ftp error', reason), sys.exc_info()[2]
|
|
# Restore the transfer mode!
|
|
self.ftp.voidcmd(cmd)
|
|
# Try to retrieve as a file
|
|
try:
|
|
cmd = 'RETR ' + file
|
|
conn = self.ftp.ntransfercmd(cmd)
|
|
except ftplib.error_perm, reason:
|
|
if reason[:3] != '550':
|
|
raise IOError, ('ftp error', reason), sys.exc_info()[2]
|
|
if not conn:
|
|
# Set transfer mode to ASCII!
|
|
self.ftp.voidcmd('TYPE A')
|
|
# Try a directory listing
|
|
if file: cmd = 'LIST ' + file
|
|
else: cmd = 'LIST'
|
|
conn = self.ftp.ntransfercmd(cmd)
|
|
self.busy = 1
|
|
# Pass back both a suitably decorated object and a retrieval length
|
|
return (addclosehook(conn[0].makefile('rb'),
|
|
self.endtransfer), conn[1])
|
|
def endtransfer(self):
|
|
if not self.busy:
|
|
return
|
|
self.busy = 0
|
|
try:
|
|
self.ftp.voidresp()
|
|
except ftperrors():
|
|
pass
|
|
def close(self):
|
|
self.endtransfer()
|
|
try:
|
|
self.ftp.close()
|
|
except ftperrors():
|
|
pass
|
|
|
|
# Base class for addinfo and addclosehook
|
|
class addbase:
|
|
def __init__(self, fp):
|
|
self.fp = fp
|
|
self.read = self.fp.read
|
|
self.readline = self.fp.readline
|
|
if hasattr(self.fp, "readlines"): self.readlines = self.fp.readlines
|
|
if hasattr(self.fp, "fileno"): self.fileno = self.fp.fileno
|
|
def __repr__(self):
|
|
return '<%s at %s whose fp = %s>' % (self.__class__.__name__,
|
|
`id(self)`, `self.fp`)
|
|
def close(self):
|
|
self.read = None
|
|
self.readline = None
|
|
self.readlines = None
|
|
self.fileno = None
|
|
if self.fp: self.fp.close()
|
|
self.fp = None
|
|
|
|
# Class to add a close hook to an open file
|
|
class addclosehook(addbase):
|
|
def __init__(self, fp, closehook, *hookargs):
|
|
addbase.__init__(self, fp)
|
|
self.closehook = closehook
|
|
self.hookargs = hookargs
|
|
def close(self):
|
|
if self.closehook:
|
|
apply(self.closehook, self.hookargs)
|
|
self.closehook = None
|
|
self.hookargs = None
|
|
addbase.close(self)
|
|
|
|
# class to add an info() method to an open file
|
|
class addinfo(addbase):
|
|
def __init__(self, fp, headers):
|
|
addbase.__init__(self, fp)
|
|
self.headers = headers
|
|
def info(self):
|
|
return self.headers
|
|
|
|
# class to add info() and geturl() methods to an open file
|
|
class addinfourl(addbase):
|
|
def __init__(self, fp, headers, url):
|
|
addbase.__init__(self, fp)
|
|
self.headers = headers
|
|
self.url = url
|
|
def info(self):
|
|
return self.headers
|
|
def geturl(self):
|
|
return self.url
|
|
|
|
|
|
# Utility to combine a URL with a base URL to form a new URL
|
|
|
|
def basejoin(base, url):
|
|
type, path = splittype(url)
|
|
if type:
|
|
# if url is complete (i.e., it contains a type), return it
|
|
return url
|
|
host, path = splithost(path)
|
|
type, basepath = splittype(base) # inherit type from base
|
|
if host:
|
|
# if url contains host, just inherit type
|
|
if type: return type + '://' + host + path
|
|
else:
|
|
# no type inherited, so url must have started with //
|
|
# just return it
|
|
return url
|
|
host, basepath = splithost(basepath) # inherit host
|
|
basepath, basetag = splittag(basepath) # remove extraneuous cruft
|
|
basepath, basequery = splitquery(basepath) # idem
|
|
if path[:1] != '/':
|
|
# non-absolute path name
|
|
if path[:1] in ('#', '?'):
|
|
# path is just a tag or query, attach to basepath
|
|
i = len(basepath)
|
|
else:
|
|
# else replace last component
|
|
i = string.rfind(basepath, '/')
|
|
if i < 0:
|
|
# basepath not absolute
|
|
if host:
|
|
# host present, make absolute
|
|
basepath = '/'
|
|
else:
|
|
# else keep non-absolute
|
|
basepath = ''
|
|
else:
|
|
# remove last file component
|
|
basepath = basepath[:i+1]
|
|
# Interpret ../ (important because of symlinks)
|
|
while basepath and path[:3] == '../':
|
|
path = path[3:]
|
|
i = string.rfind(basepath[:-1], '/')
|
|
if i > 0:
|
|
basepath = basepath[:i+1]
|
|
elif i == 0:
|
|
basepath = '/'
|
|
break
|
|
else:
|
|
basepath = ''
|
|
|
|
path = basepath + path
|
|
if type and host: return type + '://' + host + path
|
|
elif type: return type + ':' + path
|
|
elif host: return '//' + host + path # don't know what this means
|
|
else: return path
|
|
|
|
|
|
# Utilities to parse URLs (most of these return None for missing parts):
|
|
# unwrap('<URL:type://host/path>') --> 'type://host/path'
|
|
# splittype('type:opaquestring') --> 'type', 'opaquestring'
|
|
# splithost('//host[:port]/path') --> 'host[:port]', '/path'
|
|
# splituser('user[:passwd]@host[:port]') --> 'user[:passwd]', 'host[:port]'
|
|
# splitpasswd('user:passwd') -> 'user', 'passwd'
|
|
# splitport('host:port') --> 'host', 'port'
|
|
# splitquery('/path?query') --> '/path', 'query'
|
|
# splittag('/path#tag') --> '/path', 'tag'
|
|
# splitattr('/path;attr1=value1;attr2=value2;...') ->
|
|
# '/path', ['attr1=value1', 'attr2=value2', ...]
|
|
# splitvalue('attr=value') --> 'attr', 'value'
|
|
# splitgophertype('/Xselector') --> 'X', 'selector'
|
|
# unquote('abc%20def') -> 'abc def'
|
|
# quote('abc def') -> 'abc%20def')
|
|
|
|
def unwrap(url):
|
|
url = string.strip(url)
|
|
if url[:1] == '<' and url[-1:] == '>':
|
|
url = string.strip(url[1:-1])
|
|
if url[:4] == 'URL:': url = string.strip(url[4:])
|
|
return url
|
|
|
|
_typeprog = None
|
|
def splittype(url):
|
|
global _typeprog
|
|
if _typeprog is None:
|
|
import re
|
|
_typeprog = re.compile('^([^/:]+):')
|
|
|
|
match = _typeprog.match(url)
|
|
if match:
|
|
scheme = match.group(1)
|
|
return scheme, url[len(scheme) + 1:]
|
|
return None, url
|
|
|
|
_hostprog = None
|
|
def splithost(url):
|
|
global _hostprog
|
|
if _hostprog is None:
|
|
import re
|
|
_hostprog = re.compile('^//([^/]*)(.*)$')
|
|
|
|
match = _hostprog.match(url)
|
|
if match: return match.group(1, 2)
|
|
return None, url
|
|
|
|
_userprog = None
|
|
def splituser(host):
|
|
global _userprog
|
|
if _userprog is None:
|
|
import re
|
|
_userprog = re.compile('^([^@]*)@(.*)$')
|
|
|
|
match = _userprog.match(host)
|
|
if match: return match.group(1, 2)
|
|
return None, host
|
|
|
|
_passwdprog = None
|
|
def splitpasswd(user):
|
|
global _passwdprog
|
|
if _passwdprog is None:
|
|
import re
|
|
_passwdprog = re.compile('^([^:]*):(.*)$')
|
|
|
|
match = _passwdprog.match(user)
|
|
if match: return match.group(1, 2)
|
|
return user, None
|
|
|
|
_portprog = None
|
|
def splitport(host):
|
|
global _portprog
|
|
if _portprog is None:
|
|
import re
|
|
_portprog = re.compile('^(.*):([0-9]+)$')
|
|
|
|
match = _portprog.match(host)
|
|
if match: return match.group(1, 2)
|
|
return host, None
|
|
|
|
# Split host and port, returning numeric port.
|
|
# Return given default port if no ':' found; defaults to -1.
|
|
# Return numerical port if a valid number are found after ':'.
|
|
# Return None if ':' but not a valid number.
|
|
_nportprog = None
|
|
def splitnport(host, defport=-1):
|
|
global _nportprog
|
|
if _nportprog is None:
|
|
import re
|
|
_nportprog = re.compile('^(.*):(.*)$')
|
|
|
|
match = _nportprog.match(host)
|
|
if match:
|
|
host, port = match.group(1, 2)
|
|
try:
|
|
if not port: raise string.atoi_error, "no digits"
|
|
nport = string.atoi(port)
|
|
except string.atoi_error:
|
|
nport = None
|
|
return host, nport
|
|
return host, defport
|
|
|
|
_queryprog = None
|
|
def splitquery(url):
|
|
global _queryprog
|
|
if _queryprog is None:
|
|
import re
|
|
_queryprog = re.compile('^(.*)\?([^?]*)$')
|
|
|
|
match = _queryprog.match(url)
|
|
if match: return match.group(1, 2)
|
|
return url, None
|
|
|
|
_tagprog = None
|
|
def splittag(url):
|
|
global _tagprog
|
|
if _tagprog is None:
|
|
import re
|
|
_tagprog = re.compile('^(.*)#([^#]*)$')
|
|
|
|
match = _tagprog.match(url)
|
|
if match: return match.group(1, 2)
|
|
return url, None
|
|
|
|
def splitattr(url):
|
|
words = string.splitfields(url, ';')
|
|
return words[0], words[1:]
|
|
|
|
_valueprog = None
|
|
def splitvalue(attr):
|
|
global _valueprog
|
|
if _valueprog is None:
|
|
import re
|
|
_valueprog = re.compile('^([^=]*)=(.*)$')
|
|
|
|
match = _valueprog.match(attr)
|
|
if match: return match.group(1, 2)
|
|
return attr, None
|
|
|
|
def splitgophertype(selector):
|
|
if selector[:1] == '/' and selector[1:2]:
|
|
return selector[1], selector[2:]
|
|
return None, selector
|
|
|
|
def unquote(s):
|
|
mychr = chr
|
|
myatoi = string.atoi
|
|
list = string.split(s, '%')
|
|
res = [list[0]]
|
|
myappend = res.append
|
|
del list[0]
|
|
for item in list:
|
|
if item[1:2]:
|
|
try:
|
|
myappend(mychr(myatoi(item[:2], 16))
|
|
+ item[2:])
|
|
except:
|
|
myappend('%' + item)
|
|
else:
|
|
myappend('%' + item)
|
|
return string.join(res, "")
|
|
|
|
def unquote_plus(s):
|
|
if '+' in s:
|
|
# replace '+' with ' '
|
|
s = string.join(string.split(s, '+'), ' ')
|
|
return unquote(s)
|
|
|
|
always_safe = string.letters + string.digits + '_,.-'
|
|
def quote(s, safe = '/'):
|
|
# XXX Can speed this up an order of magnitude
|
|
safe = always_safe + safe
|
|
res = list(s)
|
|
for i in range(len(res)):
|
|
c = res[i]
|
|
if c not in safe:
|
|
res[i] = '%%%02x' % ord(c)
|
|
return string.joinfields(res, '')
|
|
|
|
def quote_plus(s, safe = '/'):
|
|
# XXX Can speed this up an order of magnitude
|
|
if ' ' in s:
|
|
# replace ' ' with '+'
|
|
l = string.split(s, ' ')
|
|
for i in range(len(l)):
|
|
l[i] = quote(l[i], safe)
|
|
return string.join(l, '+')
|
|
else:
|
|
return quote(s, safe)
|
|
|
|
def urlencode(dict):
|
|
l = []
|
|
for k, v in dict.items():
|
|
k = quote_plus(str(k))
|
|
v = quote_plus(str(v))
|
|
l.append(k + '=' + v)
|
|
return string.join(l, '&')
|
|
|
|
|
|
# Proxy handling
|
|
if os.name == 'mac':
|
|
def getproxies():
|
|
"""Return a dictionary of scheme -> proxy server URL mappings.
|
|
|
|
By convention the mac uses Internet Config to store
|
|
proxies. An HTTP proxy, for instance, is stored under
|
|
the HttpProxy key.
|
|
|
|
"""
|
|
try:
|
|
import ic
|
|
except ImportError:
|
|
return {}
|
|
|
|
try:
|
|
config = ic.IC()
|
|
except ic.error:
|
|
return {}
|
|
proxies = {}
|
|
# HTTP:
|
|
if config.has_key('UseHTTPProxy') and config['UseHTTPProxy']:
|
|
try:
|
|
value = config['HTTPProxyHost']
|
|
except ic.error:
|
|
pass
|
|
else:
|
|
proxies['http'] = 'http://%s' % value
|
|
# FTP: XXXX To be done.
|
|
# Gopher: XXXX To be done.
|
|
return proxies
|
|
|
|
else:
|
|
def getproxies():
|
|
"""Return a dictionary of scheme -> proxy server URL mappings.
|
|
|
|
Scan the environment for variables named <scheme>_proxy;
|
|
this seems to be the standard convention. If you need a
|
|
different way, you can pass a proxies dictionary to the
|
|
[Fancy]URLopener constructor.
|
|
|
|
"""
|
|
proxies = {}
|
|
for name, value in os.environ.items():
|
|
name = string.lower(name)
|
|
if value and name[-6:] == '_proxy':
|
|
proxies[name[:-6]] = value
|
|
return proxies
|
|
|
|
|
|
# Test and time quote() and unquote()
|
|
def test1():
|
|
import time
|
|
s = ''
|
|
for i in range(256): s = s + chr(i)
|
|
s = s*4
|
|
t0 = time.time()
|
|
qs = quote(s)
|
|
uqs = unquote(qs)
|
|
t1 = time.time()
|
|
if uqs != s:
|
|
print 'Wrong!'
|
|
print `s`
|
|
print `qs`
|
|
print `uqs`
|
|
print round(t1 - t0, 3), 'sec'
|
|
|
|
|
|
def reporthook(blocknum, blocksize, totalsize):
|
|
# Report during remote transfers
|
|
print "Block number: %d, Block size: %d, Total size: %d" % (blocknum, blocksize, totalsize)
|
|
|
|
# Test program
|
|
def test(args=[]):
|
|
if not args:
|
|
args = [
|
|
'/etc/passwd',
|
|
'file:/etc/passwd',
|
|
'file://localhost/etc/passwd',
|
|
'ftp://ftp.python.org/etc/passwd',
|
|
## 'gopher://gopher.micro.umn.edu/1/',
|
|
'http://www.python.org/index.html',
|
|
]
|
|
if hasattr(URLopener, "open_https"):
|
|
args.append('https://synergy.as.cmu.edu/~geek/')
|
|
try:
|
|
for url in args:
|
|
print '-'*10, url, '-'*10
|
|
fn, h = urlretrieve(url, None, reporthook)
|
|
print fn, h
|
|
if h:
|
|
print '======'
|
|
for k in h.keys(): print k + ':', h[k]
|
|
print '======'
|
|
fp = open(fn, 'rb')
|
|
data = fp.read()
|
|
del fp
|
|
if '\r' in data:
|
|
table = string.maketrans("", "")
|
|
data = string.translate(data, table, "\r")
|
|
print data
|
|
fn, h = None, None
|
|
print '-'*40
|
|
finally:
|
|
urlcleanup()
|
|
|
|
def main():
|
|
import getopt, sys
|
|
try:
|
|
opts, args = getopt.getopt(sys.argv[1:], "th")
|
|
except getopt.error, msg:
|
|
print msg
|
|
print "Use -h for help"
|
|
return
|
|
t = 0
|
|
for o, a in opts:
|
|
if o == '-t':
|
|
t = t + 1
|
|
if o == '-h':
|
|
print "Usage: python urllib.py [-t] [url ...]"
|
|
print "-t runs self-test;",
|
|
print "otherwise, contents of urls are printed"
|
|
return
|
|
if t:
|
|
if t > 1:
|
|
test1()
|
|
test(args)
|
|
else:
|
|
if not args:
|
|
print "Use -h for help"
|
|
for url in args:
|
|
print urlopen(url).read(),
|
|
|
|
# Run test program when run as a script
|
|
if __name__ == '__main__':
|
|
main()
|