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1022 lines
36 KiB
1022 lines
36 KiB
"""Parse (absolute and relative) URLs.
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urlparse module is based upon the following RFC specifications.
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RFC 3986 (STD66): "Uniform Resource Identifiers" by T. Berners-Lee, R. Fielding
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and L. Masinter, January 2005.
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RFC 2732 : "Format for Literal IPv6 Addresses in URL's by R.Hinden, B.Carpenter
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and L.Masinter, December 1999.
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RFC 2396: "Uniform Resource Identifiers (URI)": Generic Syntax by T.
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Berners-Lee, R. Fielding, and L. Masinter, August 1998.
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RFC 2368: "The mailto URL scheme", by P.Hoffman , L Masinter, J. Zawinski, July 1998.
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RFC 1808: "Relative Uniform Resource Locators", by R. Fielding, UC Irvine, June
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1995.
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RFC 1738: "Uniform Resource Locators (URL)" by T. Berners-Lee, L. Masinter, M.
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McCahill, December 1994
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RFC 3986 is considered the current standard and any future changes to
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urlparse module should conform with it. The urlparse module is
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currently not entirely compliant with this RFC due to defacto
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scenarios for parsing, and for backward compatibility purposes, some
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parsing quirks from older RFCs are retained. The testcases in
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test_urlparse.py provides a good indicator of parsing behavior.
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"""
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import re
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import sys
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import collections
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__all__ = ["urlparse", "urlunparse", "urljoin", "urldefrag",
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"urlsplit", "urlunsplit", "urlencode", "parse_qs",
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"parse_qsl", "quote", "quote_plus", "quote_from_bytes",
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"unquote", "unquote_plus", "unquote_to_bytes",
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"DefragResult", "ParseResult", "SplitResult",
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"DefragResultBytes", "ParseResultBytes", "SplitResultBytes"]
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# A classification of schemes.
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# The empty string classifies URLs with no scheme specified,
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# being the default value returned by “urlsplit” and “urlparse”.
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uses_relative = ['', 'ftp', 'http', 'gopher', 'nntp', 'imap',
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'wais', 'file', 'https', 'shttp', 'mms',
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'prospero', 'rtsp', 'rtspu', 'sftp',
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'svn', 'svn+ssh', 'ws', 'wss']
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uses_netloc = ['', 'ftp', 'http', 'gopher', 'nntp', 'telnet',
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'imap', 'wais', 'file', 'mms', 'https', 'shttp',
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'snews', 'prospero', 'rtsp', 'rtspu', 'rsync',
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'svn', 'svn+ssh', 'sftp', 'nfs', 'git', 'git+ssh',
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'ws', 'wss']
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uses_params = ['', 'ftp', 'hdl', 'prospero', 'http', 'imap',
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'https', 'shttp', 'rtsp', 'rtspu', 'sip', 'sips',
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'mms', 'sftp', 'tel']
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# These are not actually used anymore, but should stay for backwards
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# compatibility. (They are undocumented, but have a public-looking name.)
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non_hierarchical = ['gopher', 'hdl', 'mailto', 'news',
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'telnet', 'wais', 'imap', 'snews', 'sip', 'sips']
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uses_query = ['', 'http', 'wais', 'imap', 'https', 'shttp', 'mms',
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'gopher', 'rtsp', 'rtspu', 'sip', 'sips']
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uses_fragment = ['', 'ftp', 'hdl', 'http', 'gopher', 'news',
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'nntp', 'wais', 'https', 'shttp', 'snews',
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'file', 'prospero']
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# Characters valid in scheme names
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scheme_chars = ('abcdefghijklmnopqrstuvwxyz'
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'ABCDEFGHIJKLMNOPQRSTUVWXYZ'
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'0123456789'
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'+-.')
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# XXX: Consider replacing with functools.lru_cache
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MAX_CACHE_SIZE = 20
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_parse_cache = {}
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def clear_cache():
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"""Clear the parse cache and the quoters cache."""
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_parse_cache.clear()
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_safe_quoters.clear()
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# Helpers for bytes handling
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# For 3.2, we deliberately require applications that
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# handle improperly quoted URLs to do their own
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# decoding and encoding. If valid use cases are
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# presented, we may relax this by using latin-1
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# decoding internally for 3.3
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_implicit_encoding = 'ascii'
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_implicit_errors = 'strict'
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def _noop(obj):
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return obj
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def _encode_result(obj, encoding=_implicit_encoding,
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errors=_implicit_errors):
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return obj.encode(encoding, errors)
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def _decode_args(args, encoding=_implicit_encoding,
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errors=_implicit_errors):
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return tuple(x.decode(encoding, errors) if x else '' for x in args)
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def _coerce_args(*args):
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# Invokes decode if necessary to create str args
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# and returns the coerced inputs along with
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# an appropriate result coercion function
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# - noop for str inputs
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# - encoding function otherwise
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str_input = isinstance(args[0], str)
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for arg in args[1:]:
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# We special-case the empty string to support the
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# "scheme=''" default argument to some functions
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if arg and isinstance(arg, str) != str_input:
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raise TypeError("Cannot mix str and non-str arguments")
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if str_input:
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return args + (_noop,)
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return _decode_args(args) + (_encode_result,)
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# Result objects are more helpful than simple tuples
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class _ResultMixinStr(object):
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"""Standard approach to encoding parsed results from str to bytes"""
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__slots__ = ()
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def encode(self, encoding='ascii', errors='strict'):
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return self._encoded_counterpart(*(x.encode(encoding, errors) for x in self))
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class _ResultMixinBytes(object):
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"""Standard approach to decoding parsed results from bytes to str"""
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__slots__ = ()
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def decode(self, encoding='ascii', errors='strict'):
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return self._decoded_counterpart(*(x.decode(encoding, errors) for x in self))
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class _NetlocResultMixinBase(object):
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"""Shared methods for the parsed result objects containing a netloc element"""
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__slots__ = ()
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@property
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def username(self):
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return self._userinfo[0]
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@property
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def password(self):
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return self._userinfo[1]
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@property
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def hostname(self):
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hostname = self._hostinfo[0]
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if not hostname:
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hostname = None
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elif hostname is not None:
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hostname = hostname.lower()
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return hostname
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@property
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def port(self):
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port = self._hostinfo[1]
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if port is not None:
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port = int(port, 10)
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if not ( 0 <= port <= 65535):
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raise ValueError("Port out of range 0-65535")
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return port
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class _NetlocResultMixinStr(_NetlocResultMixinBase, _ResultMixinStr):
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__slots__ = ()
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@property
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def _userinfo(self):
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netloc = self.netloc
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userinfo, have_info, hostinfo = netloc.rpartition('@')
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if have_info:
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username, have_password, password = userinfo.partition(':')
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if not have_password:
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password = None
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else:
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username = password = None
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return username, password
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@property
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def _hostinfo(self):
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netloc = self.netloc
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_, _, hostinfo = netloc.rpartition('@')
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_, have_open_br, bracketed = hostinfo.partition('[')
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if have_open_br:
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hostname, _, port = bracketed.partition(']')
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_, _, port = port.partition(':')
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else:
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hostname, _, port = hostinfo.partition(':')
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if not port:
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port = None
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return hostname, port
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class _NetlocResultMixinBytes(_NetlocResultMixinBase, _ResultMixinBytes):
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__slots__ = ()
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@property
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def _userinfo(self):
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netloc = self.netloc
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userinfo, have_info, hostinfo = netloc.rpartition(b'@')
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if have_info:
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username, have_password, password = userinfo.partition(b':')
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if not have_password:
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password = None
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else:
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username = password = None
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return username, password
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@property
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def _hostinfo(self):
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netloc = self.netloc
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_, _, hostinfo = netloc.rpartition(b'@')
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_, have_open_br, bracketed = hostinfo.partition(b'[')
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if have_open_br:
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hostname, _, port = bracketed.partition(b']')
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_, _, port = port.partition(b':')
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else:
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hostname, _, port = hostinfo.partition(b':')
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if not port:
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port = None
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return hostname, port
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from collections import namedtuple
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_DefragResultBase = namedtuple('DefragResult', 'url fragment')
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_SplitResultBase = namedtuple(
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'SplitResult', 'scheme netloc path query fragment')
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_ParseResultBase = namedtuple(
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'ParseResult', 'scheme netloc path params query fragment')
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_DefragResultBase.__doc__ = """
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DefragResult(url, fragment)
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A 2-tuple that contains the url without fragment identifier and the fragment
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identifier as a separate argument.
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"""
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_DefragResultBase.url.__doc__ = """The URL with no fragment identifier."""
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_DefragResultBase.fragment.__doc__ = """
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Fragment identifier separated from URL, that allows indirect identification of a
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secondary resource by reference to a primary resource and additional identifying
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information.
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"""
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_SplitResultBase.__doc__ = """
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SplitResult(scheme, netloc, path, query, fragment)
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A 5-tuple that contains the different components of a URL. Similar to
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ParseResult, but does not split params.
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"""
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_SplitResultBase.scheme.__doc__ = """Specifies URL scheme for the request."""
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_SplitResultBase.netloc.__doc__ = """
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Network location where the request is made to.
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"""
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_SplitResultBase.path.__doc__ = """
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The hierarchical path, such as the path to a file to download.
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"""
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_SplitResultBase.query.__doc__ = """
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The query component, that contains non-hierarchical data, that along with data
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in path component, identifies a resource in the scope of URI's scheme and
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network location.
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"""
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_SplitResultBase.fragment.__doc__ = """
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Fragment identifier, that allows indirect identification of a secondary resource
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by reference to a primary resource and additional identifying information.
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"""
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_ParseResultBase.__doc__ = """
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ParseResult(scheme, netloc, path, params, query, fragment)
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A 6-tuple that contains components of a parsed URL.
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"""
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_ParseResultBase.scheme.__doc__ = _SplitResultBase.scheme.__doc__
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_ParseResultBase.netloc.__doc__ = _SplitResultBase.netloc.__doc__
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_ParseResultBase.path.__doc__ = _SplitResultBase.path.__doc__
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_ParseResultBase.params.__doc__ = """
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Parameters for last path element used to dereference the URI in order to provide
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access to perform some operation on the resource.
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"""
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_ParseResultBase.query.__doc__ = _SplitResultBase.query.__doc__
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_ParseResultBase.fragment.__doc__ = _SplitResultBase.fragment.__doc__
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# For backwards compatibility, alias _NetlocResultMixinStr
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# ResultBase is no longer part of the documented API, but it is
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# retained since deprecating it isn't worth the hassle
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ResultBase = _NetlocResultMixinStr
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# Structured result objects for string data
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class DefragResult(_DefragResultBase, _ResultMixinStr):
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__slots__ = ()
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def geturl(self):
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if self.fragment:
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return self.url + '#' + self.fragment
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else:
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return self.url
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class SplitResult(_SplitResultBase, _NetlocResultMixinStr):
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__slots__ = ()
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def geturl(self):
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return urlunsplit(self)
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class ParseResult(_ParseResultBase, _NetlocResultMixinStr):
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__slots__ = ()
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def geturl(self):
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return urlunparse(self)
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# Structured result objects for bytes data
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class DefragResultBytes(_DefragResultBase, _ResultMixinBytes):
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__slots__ = ()
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def geturl(self):
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if self.fragment:
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return self.url + b'#' + self.fragment
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else:
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return self.url
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class SplitResultBytes(_SplitResultBase, _NetlocResultMixinBytes):
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__slots__ = ()
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def geturl(self):
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return urlunsplit(self)
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class ParseResultBytes(_ParseResultBase, _NetlocResultMixinBytes):
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__slots__ = ()
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def geturl(self):
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return urlunparse(self)
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# Set up the encode/decode result pairs
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def _fix_result_transcoding():
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_result_pairs = (
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(DefragResult, DefragResultBytes),
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(SplitResult, SplitResultBytes),
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(ParseResult, ParseResultBytes),
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)
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for _decoded, _encoded in _result_pairs:
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_decoded._encoded_counterpart = _encoded
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_encoded._decoded_counterpart = _decoded
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_fix_result_transcoding()
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del _fix_result_transcoding
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def urlparse(url, scheme='', allow_fragments=True):
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"""Parse a URL into 6 components:
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<scheme>://<netloc>/<path>;<params>?<query>#<fragment>
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Return a 6-tuple: (scheme, netloc, path, params, query, fragment).
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Note that we don't break the components up in smaller bits
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(e.g. netloc is a single string) and we don't expand % escapes."""
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url, scheme, _coerce_result = _coerce_args(url, scheme)
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splitresult = urlsplit(url, scheme, allow_fragments)
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scheme, netloc, url, query, fragment = splitresult
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if scheme in uses_params and ';' in url:
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url, params = _splitparams(url)
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else:
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params = ''
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result = ParseResult(scheme, netloc, url, params, query, fragment)
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return _coerce_result(result)
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def _splitparams(url):
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if '/' in url:
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i = url.find(';', url.rfind('/'))
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if i < 0:
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return url, ''
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else:
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i = url.find(';')
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return url[:i], url[i+1:]
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def _splitnetloc(url, start=0):
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delim = len(url) # position of end of domain part of url, default is end
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for c in '/?#': # look for delimiters; the order is NOT important
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wdelim = url.find(c, start) # find first of this delim
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if wdelim >= 0: # if found
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delim = min(delim, wdelim) # use earliest delim position
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return url[start:delim], url[delim:] # return (domain, rest)
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def urlsplit(url, scheme='', allow_fragments=True):
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"""Parse a URL into 5 components:
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<scheme>://<netloc>/<path>?<query>#<fragment>
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Return a 5-tuple: (scheme, netloc, path, query, fragment).
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Note that we don't break the components up in smaller bits
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(e.g. netloc is a single string) and we don't expand % escapes."""
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url, scheme, _coerce_result = _coerce_args(url, scheme)
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allow_fragments = bool(allow_fragments)
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key = url, scheme, allow_fragments, type(url), type(scheme)
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cached = _parse_cache.get(key, None)
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if cached:
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return _coerce_result(cached)
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if len(_parse_cache) >= MAX_CACHE_SIZE: # avoid runaway growth
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clear_cache()
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netloc = query = fragment = ''
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i = url.find(':')
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if i > 0:
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if url[:i] == 'http': # optimize the common case
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scheme = url[:i].lower()
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url = url[i+1:]
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if url[:2] == '//':
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netloc, url = _splitnetloc(url, 2)
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if (('[' in netloc and ']' not in netloc) or
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(']' in netloc and '[' not in netloc)):
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raise ValueError("Invalid IPv6 URL")
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if allow_fragments and '#' in url:
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url, fragment = url.split('#', 1)
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if '?' in url:
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url, query = url.split('?', 1)
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v = SplitResult(scheme, netloc, url, query, fragment)
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_parse_cache[key] = v
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return _coerce_result(v)
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for c in url[:i]:
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if c not in scheme_chars:
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break
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else:
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# make sure "url" is not actually a port number (in which case
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# "scheme" is really part of the path)
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rest = url[i+1:]
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if not rest or any(c not in '0123456789' for c in rest):
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# not a port number
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scheme, url = url[:i].lower(), rest
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if url[:2] == '//':
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netloc, url = _splitnetloc(url, 2)
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if (('[' in netloc and ']' not in netloc) or
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(']' in netloc and '[' not in netloc)):
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raise ValueError("Invalid IPv6 URL")
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if allow_fragments and '#' in url:
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url, fragment = url.split('#', 1)
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if '?' in url:
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url, query = url.split('?', 1)
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v = SplitResult(scheme, netloc, url, query, fragment)
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_parse_cache[key] = v
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return _coerce_result(v)
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def urlunparse(components):
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"""Put a parsed URL back together again. This may result in a
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slightly different, but equivalent URL, if the URL that was parsed
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originally had redundant delimiters, e.g. a ? with an empty query
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(the draft states that these are equivalent)."""
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scheme, netloc, url, params, query, fragment, _coerce_result = (
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_coerce_args(*components))
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if params:
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url = "%s;%s" % (url, params)
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return _coerce_result(urlunsplit((scheme, netloc, url, query, fragment)))
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def urlunsplit(components):
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"""Combine the elements of a tuple as returned by urlsplit() into a
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complete URL as a string. The data argument can be any five-item iterable.
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This may result in a slightly different, but equivalent URL, if the URL that
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was parsed originally had unnecessary delimiters (for example, a ? with an
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empty query; the RFC states that these are equivalent)."""
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scheme, netloc, url, query, fragment, _coerce_result = (
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_coerce_args(*components))
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if netloc or (scheme and scheme in uses_netloc and url[:2] != '//'):
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if url and url[:1] != '/': url = '/' + url
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url = '//' + (netloc or '') + url
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if scheme:
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url = scheme + ':' + url
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if query:
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url = url + '?' + query
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if fragment:
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url = url + '#' + fragment
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return _coerce_result(url)
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def urljoin(base, url, allow_fragments=True):
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"""Join a base URL and a possibly relative URL to form an absolute
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interpretation of the latter."""
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if not base:
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return url
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if not url:
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return base
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base, url, _coerce_result = _coerce_args(base, url)
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bscheme, bnetloc, bpath, bparams, bquery, bfragment = \
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urlparse(base, '', allow_fragments)
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scheme, netloc, path, params, query, fragment = \
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urlparse(url, bscheme, allow_fragments)
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|
|
if scheme != bscheme or scheme not in uses_relative:
|
|
return _coerce_result(url)
|
|
if scheme in uses_netloc:
|
|
if netloc:
|
|
return _coerce_result(urlunparse((scheme, netloc, path,
|
|
params, query, fragment)))
|
|
netloc = bnetloc
|
|
|
|
if not path and not params:
|
|
path = bpath
|
|
params = bparams
|
|
if not query:
|
|
query = bquery
|
|
return _coerce_result(urlunparse((scheme, netloc, path,
|
|
params, query, fragment)))
|
|
|
|
base_parts = bpath.split('/')
|
|
if base_parts[-1] != '':
|
|
# the last item is not a directory, so will not be taken into account
|
|
# in resolving the relative path
|
|
del base_parts[-1]
|
|
|
|
# for rfc3986, ignore all base path should the first character be root.
|
|
if path[:1] == '/':
|
|
segments = path.split('/')
|
|
else:
|
|
segments = base_parts + path.split('/')
|
|
# filter out elements that would cause redundant slashes on re-joining
|
|
# the resolved_path
|
|
segments[1:-1] = filter(None, segments[1:-1])
|
|
|
|
resolved_path = []
|
|
|
|
for seg in segments:
|
|
if seg == '..':
|
|
try:
|
|
resolved_path.pop()
|
|
except IndexError:
|
|
# ignore any .. segments that would otherwise cause an IndexError
|
|
# when popped from resolved_path if resolving for rfc3986
|
|
pass
|
|
elif seg == '.':
|
|
continue
|
|
else:
|
|
resolved_path.append(seg)
|
|
|
|
if segments[-1] in ('.', '..'):
|
|
# do some post-processing here. if the last segment was a relative dir,
|
|
# then we need to append the trailing '/'
|
|
resolved_path.append('')
|
|
|
|
return _coerce_result(urlunparse((scheme, netloc, '/'.join(
|
|
resolved_path) or '/', params, query, fragment)))
|
|
|
|
|
|
def urldefrag(url):
|
|
"""Removes any existing fragment from URL.
|
|
|
|
Returns a tuple of the defragmented URL and the fragment. If
|
|
the URL contained no fragments, the second element is the
|
|
empty string.
|
|
"""
|
|
url, _coerce_result = _coerce_args(url)
|
|
if '#' in url:
|
|
s, n, p, a, q, frag = urlparse(url)
|
|
defrag = urlunparse((s, n, p, a, q, ''))
|
|
else:
|
|
frag = ''
|
|
defrag = url
|
|
return _coerce_result(DefragResult(defrag, frag))
|
|
|
|
_hexdig = '0123456789ABCDEFabcdef'
|
|
_hextobyte = None
|
|
|
|
def unquote_to_bytes(string):
|
|
"""unquote_to_bytes('abc%20def') -> b'abc def'."""
|
|
# Note: strings are encoded as UTF-8. This is only an issue if it contains
|
|
# unescaped non-ASCII characters, which URIs should not.
|
|
if not string:
|
|
# Is it a string-like object?
|
|
string.split
|
|
return b''
|
|
if isinstance(string, str):
|
|
string = string.encode('utf-8')
|
|
bits = string.split(b'%')
|
|
if len(bits) == 1:
|
|
return string
|
|
res = [bits[0]]
|
|
append = res.append
|
|
# Delay the initialization of the table to not waste memory
|
|
# if the function is never called
|
|
global _hextobyte
|
|
if _hextobyte is None:
|
|
_hextobyte = {(a + b).encode(): bytes([int(a + b, 16)])
|
|
for a in _hexdig for b in _hexdig}
|
|
for item in bits[1:]:
|
|
try:
|
|
append(_hextobyte[item[:2]])
|
|
append(item[2:])
|
|
except KeyError:
|
|
append(b'%')
|
|
append(item)
|
|
return b''.join(res)
|
|
|
|
_asciire = re.compile('([\x00-\x7f]+)')
|
|
|
|
def unquote(string, encoding='utf-8', errors='replace'):
|
|
"""Replace %xx escapes by their single-character equivalent. The optional
|
|
encoding and errors parameters specify how to decode percent-encoded
|
|
sequences into Unicode characters, as accepted by the bytes.decode()
|
|
method.
|
|
By default, percent-encoded sequences are decoded with UTF-8, and invalid
|
|
sequences are replaced by a placeholder character.
|
|
|
|
unquote('abc%20def') -> 'abc def'.
|
|
"""
|
|
if '%' not in string:
|
|
string.split
|
|
return string
|
|
if encoding is None:
|
|
encoding = 'utf-8'
|
|
if errors is None:
|
|
errors = 'replace'
|
|
bits = _asciire.split(string)
|
|
res = [bits[0]]
|
|
append = res.append
|
|
for i in range(1, len(bits), 2):
|
|
append(unquote_to_bytes(bits[i]).decode(encoding, errors))
|
|
append(bits[i + 1])
|
|
return ''.join(res)
|
|
|
|
|
|
def parse_qs(qs, keep_blank_values=False, strict_parsing=False,
|
|
encoding='utf-8', errors='replace'):
|
|
"""Parse a query given as a string argument.
|
|
|
|
Arguments:
|
|
|
|
qs: percent-encoded query string to be parsed
|
|
|
|
keep_blank_values: flag indicating whether blank values in
|
|
percent-encoded queries should be treated as blank strings.
|
|
A true value indicates that blanks should be retained as
|
|
blank strings. The default false value indicates that
|
|
blank values are to be ignored and treated as if they were
|
|
not included.
|
|
|
|
strict_parsing: flag indicating what to do with parsing errors.
|
|
If false (the default), errors are silently ignored.
|
|
If true, errors raise a ValueError exception.
|
|
|
|
encoding and errors: specify how to decode percent-encoded sequences
|
|
into Unicode characters, as accepted by the bytes.decode() method.
|
|
|
|
Returns a dictionary.
|
|
"""
|
|
parsed_result = {}
|
|
pairs = parse_qsl(qs, keep_blank_values, strict_parsing,
|
|
encoding=encoding, errors=errors)
|
|
for name, value in pairs:
|
|
if name in parsed_result:
|
|
parsed_result[name].append(value)
|
|
else:
|
|
parsed_result[name] = [value]
|
|
return parsed_result
|
|
|
|
|
|
def parse_qsl(qs, keep_blank_values=False, strict_parsing=False,
|
|
encoding='utf-8', errors='replace'):
|
|
"""Parse a query given as a string argument.
|
|
|
|
Arguments:
|
|
|
|
qs: percent-encoded query string to be parsed
|
|
|
|
keep_blank_values: flag indicating whether blank values in
|
|
percent-encoded queries should be treated as blank strings.
|
|
A true value indicates that blanks should be retained as blank
|
|
strings. The default false value indicates that blank values
|
|
are to be ignored and treated as if they were not included.
|
|
|
|
strict_parsing: flag indicating what to do with parsing errors. If
|
|
false (the default), errors are silently ignored. If true,
|
|
errors raise a ValueError exception.
|
|
|
|
encoding and errors: specify how to decode percent-encoded sequences
|
|
into Unicode characters, as accepted by the bytes.decode() method.
|
|
|
|
Returns a list, as G-d intended.
|
|
"""
|
|
qs, _coerce_result = _coerce_args(qs)
|
|
pairs = [s2 for s1 in qs.split('&') for s2 in s1.split(';')]
|
|
r = []
|
|
for name_value in pairs:
|
|
if not name_value and not strict_parsing:
|
|
continue
|
|
nv = name_value.split('=', 1)
|
|
if len(nv) != 2:
|
|
if strict_parsing:
|
|
raise ValueError("bad query field: %r" % (name_value,))
|
|
# Handle case of a control-name with no equal sign
|
|
if keep_blank_values:
|
|
nv.append('')
|
|
else:
|
|
continue
|
|
if len(nv[1]) or keep_blank_values:
|
|
name = nv[0].replace('+', ' ')
|
|
name = unquote(name, encoding=encoding, errors=errors)
|
|
name = _coerce_result(name)
|
|
value = nv[1].replace('+', ' ')
|
|
value = unquote(value, encoding=encoding, errors=errors)
|
|
value = _coerce_result(value)
|
|
r.append((name, value))
|
|
return r
|
|
|
|
def unquote_plus(string, encoding='utf-8', errors='replace'):
|
|
"""Like unquote(), but also replace plus signs by spaces, as required for
|
|
unquoting HTML form values.
|
|
|
|
unquote_plus('%7e/abc+def') -> '~/abc def'
|
|
"""
|
|
string = string.replace('+', ' ')
|
|
return unquote(string, encoding, errors)
|
|
|
|
_ALWAYS_SAFE = frozenset(b'ABCDEFGHIJKLMNOPQRSTUVWXYZ'
|
|
b'abcdefghijklmnopqrstuvwxyz'
|
|
b'0123456789'
|
|
b'_.-')
|
|
_ALWAYS_SAFE_BYTES = bytes(_ALWAYS_SAFE)
|
|
_safe_quoters = {}
|
|
|
|
class Quoter(collections.defaultdict):
|
|
"""A mapping from bytes (in range(0,256)) to strings.
|
|
|
|
String values are percent-encoded byte values, unless the key < 128, and
|
|
in the "safe" set (either the specified safe set, or default set).
|
|
"""
|
|
# Keeps a cache internally, using defaultdict, for efficiency (lookups
|
|
# of cached keys don't call Python code at all).
|
|
def __init__(self, safe):
|
|
"""safe: bytes object."""
|
|
self.safe = _ALWAYS_SAFE.union(safe)
|
|
|
|
def __repr__(self):
|
|
# Without this, will just display as a defaultdict
|
|
return "<%s %r>" % (self.__class__.__name__, dict(self))
|
|
|
|
def __missing__(self, b):
|
|
# Handle a cache miss. Store quoted string in cache and return.
|
|
res = chr(b) if b in self.safe else '%{:02X}'.format(b)
|
|
self[b] = res
|
|
return res
|
|
|
|
def quote(string, safe='/', encoding=None, errors=None):
|
|
"""quote('abc def') -> 'abc%20def'
|
|
|
|
Each part of a URL, e.g. the path info, the query, etc., has a
|
|
different set of reserved characters that must be quoted.
|
|
|
|
RFC 2396 Uniform Resource Identifiers (URI): Generic Syntax lists
|
|
the following reserved characters.
|
|
|
|
reserved = ";" | "/" | "?" | ":" | "@" | "&" | "=" | "+" |
|
|
"$" | ","
|
|
|
|
Each of these characters is reserved in some component of a URL,
|
|
but not necessarily in all of them.
|
|
|
|
By default, the quote function is intended for quoting the path
|
|
section of a URL. Thus, it will not encode '/'. This character
|
|
is reserved, but in typical usage the quote function is being
|
|
called on a path where the existing slash characters are used as
|
|
reserved characters.
|
|
|
|
string and safe may be either str or bytes objects. encoding and errors
|
|
must not be specified if string is a bytes object.
|
|
|
|
The optional encoding and errors parameters specify how to deal with
|
|
non-ASCII characters, as accepted by the str.encode method.
|
|
By default, encoding='utf-8' (characters are encoded with UTF-8), and
|
|
errors='strict' (unsupported characters raise a UnicodeEncodeError).
|
|
"""
|
|
if isinstance(string, str):
|
|
if not string:
|
|
return string
|
|
if encoding is None:
|
|
encoding = 'utf-8'
|
|
if errors is None:
|
|
errors = 'strict'
|
|
string = string.encode(encoding, errors)
|
|
else:
|
|
if encoding is not None:
|
|
raise TypeError("quote() doesn't support 'encoding' for bytes")
|
|
if errors is not None:
|
|
raise TypeError("quote() doesn't support 'errors' for bytes")
|
|
return quote_from_bytes(string, safe)
|
|
|
|
def quote_plus(string, safe='', encoding=None, errors=None):
|
|
"""Like quote(), but also replace ' ' with '+', as required for quoting
|
|
HTML form values. Plus signs in the original string are escaped unless
|
|
they are included in safe. It also does not have safe default to '/'.
|
|
"""
|
|
# Check if ' ' in string, where string may either be a str or bytes. If
|
|
# there are no spaces, the regular quote will produce the right answer.
|
|
if ((isinstance(string, str) and ' ' not in string) or
|
|
(isinstance(string, bytes) and b' ' not in string)):
|
|
return quote(string, safe, encoding, errors)
|
|
if isinstance(safe, str):
|
|
space = ' '
|
|
else:
|
|
space = b' '
|
|
string = quote(string, safe + space, encoding, errors)
|
|
return string.replace(' ', '+')
|
|
|
|
def quote_from_bytes(bs, safe='/'):
|
|
"""Like quote(), but accepts a bytes object rather than a str, and does
|
|
not perform string-to-bytes encoding. It always returns an ASCII string.
|
|
quote_from_bytes(b'abc def\x3f') -> 'abc%20def%3f'
|
|
"""
|
|
if not isinstance(bs, (bytes, bytearray)):
|
|
raise TypeError("quote_from_bytes() expected bytes")
|
|
if not bs:
|
|
return ''
|
|
if isinstance(safe, str):
|
|
# Normalize 'safe' by converting to bytes and removing non-ASCII chars
|
|
safe = safe.encode('ascii', 'ignore')
|
|
else:
|
|
safe = bytes([c for c in safe if c < 128])
|
|
if not bs.rstrip(_ALWAYS_SAFE_BYTES + safe):
|
|
return bs.decode()
|
|
try:
|
|
quoter = _safe_quoters[safe]
|
|
except KeyError:
|
|
_safe_quoters[safe] = quoter = Quoter(safe).__getitem__
|
|
return ''.join([quoter(char) for char in bs])
|
|
|
|
def urlencode(query, doseq=False, safe='', encoding=None, errors=None,
|
|
quote_via=quote_plus):
|
|
"""Encode a dict or sequence of two-element tuples into a URL query string.
|
|
|
|
If any values in the query arg are sequences and doseq is true, each
|
|
sequence element is converted to a separate parameter.
|
|
|
|
If the query arg is a sequence of two-element tuples, the order of the
|
|
parameters in the output will match the order of parameters in the
|
|
input.
|
|
|
|
The components of a query arg may each be either a string or a bytes type.
|
|
|
|
The safe, encoding, and errors parameters are passed down to the function
|
|
specified by quote_via (encoding and errors only if a component is a str).
|
|
"""
|
|
|
|
if hasattr(query, "items"):
|
|
query = query.items()
|
|
else:
|
|
# It's a bother at times that strings and string-like objects are
|
|
# sequences.
|
|
try:
|
|
# non-sequence items should not work with len()
|
|
# non-empty strings will fail this
|
|
if len(query) and not isinstance(query[0], tuple):
|
|
raise TypeError
|
|
# Zero-length sequences of all types will get here and succeed,
|
|
# but that's a minor nit. Since the original implementation
|
|
# allowed empty dicts that type of behavior probably should be
|
|
# preserved for consistency
|
|
except TypeError:
|
|
ty, va, tb = sys.exc_info()
|
|
raise TypeError("not a valid non-string sequence "
|
|
"or mapping object").with_traceback(tb)
|
|
|
|
l = []
|
|
if not doseq:
|
|
for k, v in query:
|
|
if isinstance(k, bytes):
|
|
k = quote_via(k, safe)
|
|
else:
|
|
k = quote_via(str(k), safe, encoding, errors)
|
|
|
|
if isinstance(v, bytes):
|
|
v = quote_via(v, safe)
|
|
else:
|
|
v = quote_via(str(v), safe, encoding, errors)
|
|
l.append(k + '=' + v)
|
|
else:
|
|
for k, v in query:
|
|
if isinstance(k, bytes):
|
|
k = quote_via(k, safe)
|
|
else:
|
|
k = quote_via(str(k), safe, encoding, errors)
|
|
|
|
if isinstance(v, bytes):
|
|
v = quote_via(v, safe)
|
|
l.append(k + '=' + v)
|
|
elif isinstance(v, str):
|
|
v = quote_via(v, safe, encoding, errors)
|
|
l.append(k + '=' + v)
|
|
else:
|
|
try:
|
|
# Is this a sufficient test for sequence-ness?
|
|
x = len(v)
|
|
except TypeError:
|
|
# not a sequence
|
|
v = quote_via(str(v), safe, encoding, errors)
|
|
l.append(k + '=' + v)
|
|
else:
|
|
# loop over the sequence
|
|
for elt in v:
|
|
if isinstance(elt, bytes):
|
|
elt = quote_via(elt, safe)
|
|
else:
|
|
elt = quote_via(str(elt), safe, encoding, errors)
|
|
l.append(k + '=' + elt)
|
|
return '&'.join(l)
|
|
|
|
def to_bytes(url):
|
|
"""to_bytes(u"URL") --> 'URL'."""
|
|
# Most URL schemes require ASCII. If that changes, the conversion
|
|
# can be relaxed.
|
|
# XXX get rid of to_bytes()
|
|
if isinstance(url, str):
|
|
try:
|
|
url = url.encode("ASCII").decode()
|
|
except UnicodeError:
|
|
raise UnicodeError("URL " + repr(url) +
|
|
" contains non-ASCII characters")
|
|
return url
|
|
|
|
def unwrap(url):
|
|
"""unwrap('<URL:type://host/path>') --> 'type://host/path'."""
|
|
url = str(url).strip()
|
|
if url[:1] == '<' and url[-1:] == '>':
|
|
url = url[1:-1].strip()
|
|
if url[:4] == 'URL:': url = url[4:].strip()
|
|
return url
|
|
|
|
_typeprog = None
|
|
def splittype(url):
|
|
"""splittype('type:opaquestring') --> 'type', 'opaquestring'."""
|
|
global _typeprog
|
|
if _typeprog is None:
|
|
_typeprog = re.compile('([^/:]+):(.*)', re.DOTALL)
|
|
|
|
match = _typeprog.match(url)
|
|
if match:
|
|
scheme, data = match.groups()
|
|
return scheme.lower(), data
|
|
return None, url
|
|
|
|
_hostprog = None
|
|
def splithost(url):
|
|
"""splithost('//host[:port]/path') --> 'host[:port]', '/path'."""
|
|
global _hostprog
|
|
if _hostprog is None:
|
|
_hostprog = re.compile('//([^/#?]*)(.*)', re.DOTALL)
|
|
|
|
match = _hostprog.match(url)
|
|
if match:
|
|
host_port, path = match.groups()
|
|
if path and path[0] != '/':
|
|
path = '/' + path
|
|
return host_port, path
|
|
return None, url
|
|
|
|
def splituser(host):
|
|
"""splituser('user[:passwd]@host[:port]') --> 'user[:passwd]', 'host[:port]'."""
|
|
user, delim, host = host.rpartition('@')
|
|
return (user if delim else None), host
|
|
|
|
def splitpasswd(user):
|
|
"""splitpasswd('user:passwd') -> 'user', 'passwd'."""
|
|
user, delim, passwd = user.partition(':')
|
|
return user, (passwd if delim else None)
|
|
|
|
# splittag('/path#tag') --> '/path', 'tag'
|
|
_portprog = None
|
|
def splitport(host):
|
|
"""splitport('host:port') --> 'host', 'port'."""
|
|
global _portprog
|
|
if _portprog is None:
|
|
_portprog = re.compile('(.*):([0-9]*)$', re.DOTALL)
|
|
|
|
match = _portprog.match(host)
|
|
if match:
|
|
host, port = match.groups()
|
|
if port:
|
|
return host, port
|
|
return host, None
|
|
|
|
def splitnport(host, defport=-1):
|
|
"""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."""
|
|
host, delim, port = host.rpartition(':')
|
|
if not delim:
|
|
host = port
|
|
elif port:
|
|
try:
|
|
nport = int(port)
|
|
except ValueError:
|
|
nport = None
|
|
return host, nport
|
|
return host, defport
|
|
|
|
def splitquery(url):
|
|
"""splitquery('/path?query') --> '/path', 'query'."""
|
|
path, delim, query = url.rpartition('?')
|
|
if delim:
|
|
return path, query
|
|
return url, None
|
|
|
|
def splittag(url):
|
|
"""splittag('/path#tag') --> '/path', 'tag'."""
|
|
path, delim, tag = url.rpartition('#')
|
|
if delim:
|
|
return path, tag
|
|
return url, None
|
|
|
|
def splitattr(url):
|
|
"""splitattr('/path;attr1=value1;attr2=value2;...') ->
|
|
'/path', ['attr1=value1', 'attr2=value2', ...]."""
|
|
words = url.split(';')
|
|
return words[0], words[1:]
|
|
|
|
def splitvalue(attr):
|
|
"""splitvalue('attr=value') --> 'attr', 'value'."""
|
|
attr, delim, value = attr.partition('=')
|
|
return attr, (value if delim else None)
|