FeatureEnVi: Visual Analytics for Feature Engineering Using Stepwise Selection and Semi-Automatic Extraction Approaches
https://doi.org/10.1109/TVCG.2022.3141040
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1134 lines
38 KiB
1134 lines
38 KiB
# -*- coding: utf-8 -*-
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"""
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werkzeug.urls
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~~~~~~~~~~~~~
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``werkzeug.urls`` used to provide several wrapper functions for Python 2
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urlparse, whose main purpose were to work around the behavior of the Py2
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stdlib and its lack of unicode support. While this was already a somewhat
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inconvenient situation, it got even more complicated because Python 3's
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``urllib.parse`` actually does handle unicode properly. In other words,
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this module would wrap two libraries with completely different behavior. So
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now this module contains a 2-and-3-compatible backport of Python 3's
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``urllib.parse``, which is mostly API-compatible.
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:copyright: 2007 Pallets
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:license: BSD-3-Clause
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"""
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import codecs
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import os
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import re
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from collections import namedtuple
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from ._compat import fix_tuple_repr
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from ._compat import implements_to_string
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from ._compat import make_literal_wrapper
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from ._compat import normalize_string_tuple
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from ._compat import PY2
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from ._compat import text_type
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from ._compat import to_native
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from ._compat import to_unicode
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from ._compat import try_coerce_native
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from ._internal import _decode_idna
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from ._internal import _encode_idna
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from .datastructures import iter_multi_items
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from .datastructures import MultiDict
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# A regular expression for what a valid schema looks like
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_scheme_re = re.compile(r"^[a-zA-Z0-9+-.]+$")
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# Characters that are safe in any part of an URL.
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_always_safe = frozenset(
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bytearray(
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b"abcdefghijklmnopqrstuvwxyz"
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b"ABCDEFGHIJKLMNOPQRSTUVWXYZ"
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b"0123456789"
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b"-._~"
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)
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)
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_hexdigits = "0123456789ABCDEFabcdef"
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_hextobyte = dict(
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((a + b).encode(), int(a + b, 16)) for a in _hexdigits for b in _hexdigits
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)
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_bytetohex = [("%%%02X" % char).encode("ascii") for char in range(256)]
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_URLTuple = fix_tuple_repr(
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namedtuple("_URLTuple", ["scheme", "netloc", "path", "query", "fragment"])
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)
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class BaseURL(_URLTuple):
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"""Superclass of :py:class:`URL` and :py:class:`BytesURL`."""
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__slots__ = ()
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def replace(self, **kwargs):
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"""Return an URL with the same values, except for those parameters
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given new values by whichever keyword arguments are specified."""
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return self._replace(**kwargs)
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@property
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def host(self):
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"""The host part of the URL if available, otherwise `None`. The
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host is either the hostname or the IP address mentioned in the
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URL. It will not contain the port.
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"""
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return self._split_host()[0]
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@property
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def ascii_host(self):
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"""Works exactly like :attr:`host` but will return a result that
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is restricted to ASCII. If it finds a netloc that is not ASCII
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it will attempt to idna decode it. This is useful for socket
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operations when the URL might include internationalized characters.
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"""
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rv = self.host
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if rv is not None and isinstance(rv, text_type):
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try:
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rv = _encode_idna(rv)
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except UnicodeError:
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rv = rv.encode("ascii", "ignore")
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return to_native(rv, "ascii", "ignore")
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@property
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def port(self):
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"""The port in the URL as an integer if it was present, `None`
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otherwise. This does not fill in default ports.
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"""
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try:
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rv = int(to_native(self._split_host()[1]))
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if 0 <= rv <= 65535:
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return rv
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except (ValueError, TypeError):
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pass
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@property
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def auth(self):
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"""The authentication part in the URL if available, `None`
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otherwise.
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"""
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return self._split_netloc()[0]
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@property
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def username(self):
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"""The username if it was part of the URL, `None` otherwise.
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This undergoes URL decoding and will always be a unicode string.
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"""
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rv = self._split_auth()[0]
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if rv is not None:
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return _url_unquote_legacy(rv)
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@property
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def raw_username(self):
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"""The username if it was part of the URL, `None` otherwise.
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Unlike :attr:`username` this one is not being decoded.
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"""
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return self._split_auth()[0]
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@property
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def password(self):
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"""The password if it was part of the URL, `None` otherwise.
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This undergoes URL decoding and will always be a unicode string.
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"""
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rv = self._split_auth()[1]
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if rv is not None:
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return _url_unquote_legacy(rv)
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@property
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def raw_password(self):
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"""The password if it was part of the URL, `None` otherwise.
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Unlike :attr:`password` this one is not being decoded.
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"""
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return self._split_auth()[1]
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def decode_query(self, *args, **kwargs):
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"""Decodes the query part of the URL. Ths is a shortcut for
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calling :func:`url_decode` on the query argument. The arguments and
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keyword arguments are forwarded to :func:`url_decode` unchanged.
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"""
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return url_decode(self.query, *args, **kwargs)
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def join(self, *args, **kwargs):
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"""Joins this URL with another one. This is just a convenience
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function for calling into :meth:`url_join` and then parsing the
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return value again.
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"""
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return url_parse(url_join(self, *args, **kwargs))
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def to_url(self):
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"""Returns a URL string or bytes depending on the type of the
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information stored. This is just a convenience function
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for calling :meth:`url_unparse` for this URL.
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"""
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return url_unparse(self)
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def decode_netloc(self):
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"""Decodes the netloc part into a string."""
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rv = _decode_idna(self.host or "")
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if ":" in rv:
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rv = "[%s]" % rv
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port = self.port
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if port is not None:
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rv = "%s:%d" % (rv, port)
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auth = ":".join(
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filter(
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None,
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[
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_url_unquote_legacy(self.raw_username or "", "/:%@"),
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_url_unquote_legacy(self.raw_password or "", "/:%@"),
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],
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)
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)
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if auth:
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rv = "%s@%s" % (auth, rv)
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return rv
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def to_uri_tuple(self):
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"""Returns a :class:`BytesURL` tuple that holds a URI. This will
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encode all the information in the URL properly to ASCII using the
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rules a web browser would follow.
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It's usually more interesting to directly call :meth:`iri_to_uri` which
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will return a string.
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"""
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return url_parse(iri_to_uri(self).encode("ascii"))
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def to_iri_tuple(self):
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"""Returns a :class:`URL` tuple that holds a IRI. This will try
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to decode as much information as possible in the URL without
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losing information similar to how a web browser does it for the
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URL bar.
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It's usually more interesting to directly call :meth:`uri_to_iri` which
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will return a string.
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"""
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return url_parse(uri_to_iri(self))
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def get_file_location(self, pathformat=None):
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"""Returns a tuple with the location of the file in the form
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``(server, location)``. If the netloc is empty in the URL or
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points to localhost, it's represented as ``None``.
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The `pathformat` by default is autodetection but needs to be set
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when working with URLs of a specific system. The supported values
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are ``'windows'`` when working with Windows or DOS paths and
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``'posix'`` when working with posix paths.
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If the URL does not point to a local file, the server and location
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are both represented as ``None``.
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:param pathformat: The expected format of the path component.
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Currently ``'windows'`` and ``'posix'`` are
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supported. Defaults to ``None`` which is
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autodetect.
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"""
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if self.scheme != "file":
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return None, None
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path = url_unquote(self.path)
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host = self.netloc or None
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if pathformat is None:
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if os.name == "nt":
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pathformat = "windows"
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else:
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pathformat = "posix"
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if pathformat == "windows":
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if path[:1] == "/" and path[1:2].isalpha() and path[2:3] in "|:":
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path = path[1:2] + ":" + path[3:]
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windows_share = path[:3] in ("\\" * 3, "/" * 3)
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import ntpath
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path = ntpath.normpath(path)
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# Windows shared drives are represented as ``\\host\\directory``.
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# That results in a URL like ``file://///host/directory``, and a
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# path like ``///host/directory``. We need to special-case this
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# because the path contains the hostname.
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if windows_share and host is None:
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parts = path.lstrip("\\").split("\\", 1)
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if len(parts) == 2:
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host, path = parts
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else:
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host = parts[0]
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path = ""
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elif pathformat == "posix":
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import posixpath
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path = posixpath.normpath(path)
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else:
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raise TypeError("Invalid path format %s" % repr(pathformat))
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if host in ("127.0.0.1", "::1", "localhost"):
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host = None
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return host, path
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def _split_netloc(self):
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if self._at in self.netloc:
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return self.netloc.split(self._at, 1)
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return None, self.netloc
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def _split_auth(self):
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auth = self._split_netloc()[0]
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if not auth:
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return None, None
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if self._colon not in auth:
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return auth, None
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return auth.split(self._colon, 1)
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def _split_host(self):
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rv = self._split_netloc()[1]
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if not rv:
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return None, None
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if not rv.startswith(self._lbracket):
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if self._colon in rv:
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return rv.split(self._colon, 1)
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return rv, None
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idx = rv.find(self._rbracket)
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if idx < 0:
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return rv, None
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host = rv[1:idx]
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rest = rv[idx + 1 :]
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if rest.startswith(self._colon):
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return host, rest[1:]
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return host, None
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@implements_to_string
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class URL(BaseURL):
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"""Represents a parsed URL. This behaves like a regular tuple but
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also has some extra attributes that give further insight into the
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URL.
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"""
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__slots__ = ()
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_at = "@"
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_colon = ":"
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_lbracket = "["
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_rbracket = "]"
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def __str__(self):
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return self.to_url()
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def encode_netloc(self):
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"""Encodes the netloc part to an ASCII safe URL as bytes."""
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rv = self.ascii_host or ""
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if ":" in rv:
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rv = "[%s]" % rv
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port = self.port
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if port is not None:
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rv = "%s:%d" % (rv, port)
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auth = ":".join(
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filter(
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None,
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[
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url_quote(self.raw_username or "", "utf-8", "strict", "/:%"),
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url_quote(self.raw_password or "", "utf-8", "strict", "/:%"),
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],
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)
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)
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if auth:
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rv = "%s@%s" % (auth, rv)
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return to_native(rv)
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def encode(self, charset="utf-8", errors="replace"):
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"""Encodes the URL to a tuple made out of bytes. The charset is
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only being used for the path, query and fragment.
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"""
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return BytesURL(
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self.scheme.encode("ascii"),
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self.encode_netloc(),
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self.path.encode(charset, errors),
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self.query.encode(charset, errors),
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self.fragment.encode(charset, errors),
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)
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class BytesURL(BaseURL):
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"""Represents a parsed URL in bytes."""
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__slots__ = ()
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_at = b"@"
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_colon = b":"
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_lbracket = b"["
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_rbracket = b"]"
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def __str__(self):
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return self.to_url().decode("utf-8", "replace")
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def encode_netloc(self):
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"""Returns the netloc unchanged as bytes."""
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return self.netloc
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def decode(self, charset="utf-8", errors="replace"):
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"""Decodes the URL to a tuple made out of strings. The charset is
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only being used for the path, query and fragment.
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"""
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return URL(
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self.scheme.decode("ascii"),
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self.decode_netloc(),
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self.path.decode(charset, errors),
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self.query.decode(charset, errors),
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self.fragment.decode(charset, errors),
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)
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_unquote_maps = {frozenset(): _hextobyte}
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def _unquote_to_bytes(string, unsafe=""):
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if isinstance(string, text_type):
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string = string.encode("utf-8")
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if isinstance(unsafe, text_type):
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unsafe = unsafe.encode("utf-8")
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unsafe = frozenset(bytearray(unsafe))
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groups = iter(string.split(b"%"))
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result = bytearray(next(groups, b""))
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try:
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hex_to_byte = _unquote_maps[unsafe]
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except KeyError:
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hex_to_byte = _unquote_maps[unsafe] = {
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h: b for h, b in _hextobyte.items() if b not in unsafe
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}
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for group in groups:
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code = group[:2]
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if code in hex_to_byte:
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result.append(hex_to_byte[code])
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result.extend(group[2:])
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else:
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result.append(37) # %
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result.extend(group)
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return bytes(result)
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|
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def _url_encode_impl(obj, charset, encode_keys, sort, key):
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iterable = iter_multi_items(obj)
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if sort:
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iterable = sorted(iterable, key=key)
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for key, value in iterable:
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if value is None:
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continue
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if not isinstance(key, bytes):
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key = text_type(key).encode(charset)
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if not isinstance(value, bytes):
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value = text_type(value).encode(charset)
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yield _fast_url_quote_plus(key) + "=" + _fast_url_quote_plus(value)
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|
|
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def _url_unquote_legacy(value, unsafe=""):
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try:
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return url_unquote(value, charset="utf-8", errors="strict", unsafe=unsafe)
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except UnicodeError:
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return url_unquote(value, charset="latin1", unsafe=unsafe)
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|
|
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def url_parse(url, scheme=None, allow_fragments=True):
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"""Parses a URL from a string into a :class:`URL` tuple. If the URL
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is lacking a scheme it can be provided as second argument. Otherwise,
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it is ignored. Optionally fragments can be stripped from the URL
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|
by setting `allow_fragments` to `False`.
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|
The inverse of this function is :func:`url_unparse`.
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|
:param url: the URL to parse.
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:param scheme: the default schema to use if the URL is schemaless.
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:param allow_fragments: if set to `False` a fragment will be removed
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from the URL.
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"""
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s = make_literal_wrapper(url)
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is_text_based = isinstance(url, text_type)
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|
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|
if scheme is None:
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|
scheme = s("")
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|
netloc = query = fragment = s("")
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i = url.find(s(":"))
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|
if i > 0 and _scheme_re.match(to_native(url[:i], errors="replace")):
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|
# make sure "iri" 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 s("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] == s("//"):
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|
delim = len(url)
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|
for c in s("/?#"):
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|
wdelim = url.find(c, 2)
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|
if wdelim >= 0:
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|
delim = min(delim, wdelim)
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netloc, url = url[2:delim], url[delim:]
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|
if (s("[") in netloc and s("]") not in netloc) or (
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s("]") in netloc and s("[") not in netloc
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):
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raise ValueError("Invalid IPv6 URL")
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|
|
|
if allow_fragments and s("#") in url:
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|
url, fragment = url.split(s("#"), 1)
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|
if s("?") in url:
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|
url, query = url.split(s("?"), 1)
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|
|
|
result_type = URL if is_text_based else BytesURL
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|
return result_type(scheme, netloc, url, query, fragment)
|
|
|
|
|
|
def _make_fast_url_quote(charset="utf-8", errors="strict", safe="/:", unsafe=""):
|
|
"""Precompile the translation table for a URL encoding function.
|
|
|
|
Unlike :func:`url_quote`, the generated function only takes the
|
|
string to quote.
|
|
|
|
:param charset: The charset to encode the result with.
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|
:param errors: How to handle encoding errors.
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|
:param safe: An optional sequence of safe characters to never encode.
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|
:param unsafe: An optional sequence of unsafe characters to always encode.
|
|
"""
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|
if isinstance(safe, text_type):
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|
safe = safe.encode(charset, errors)
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|
|
|
if isinstance(unsafe, text_type):
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unsafe = unsafe.encode(charset, errors)
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|
safe = (frozenset(bytearray(safe)) | _always_safe) - frozenset(bytearray(unsafe))
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table = [chr(c) if c in safe else "%%%02X" % c for c in range(256)]
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|
|
if not PY2:
|
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|
|
def quote(string):
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|
return "".join([table[c] for c in string])
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|
|
else:
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|
|
|
def quote(string):
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|
return "".join([table[c] for c in bytearray(string)])
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|
|
return quote
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|
|
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|
_fast_url_quote = _make_fast_url_quote()
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|
_fast_quote_plus = _make_fast_url_quote(safe=" ", unsafe="+")
|
|
|
|
|
|
def _fast_url_quote_plus(string):
|
|
return _fast_quote_plus(string).replace(" ", "+")
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|
|
|
|
|
def url_quote(string, charset="utf-8", errors="strict", safe="/:", unsafe=""):
|
|
"""URL encode a single string with a given encoding.
|
|
|
|
:param s: the string to quote.
|
|
:param charset: the charset to be used.
|
|
:param safe: an optional sequence of safe characters.
|
|
:param unsafe: an optional sequence of unsafe characters.
|
|
|
|
.. versionadded:: 0.9.2
|
|
The `unsafe` parameter was added.
|
|
"""
|
|
if not isinstance(string, (text_type, bytes, bytearray)):
|
|
string = text_type(string)
|
|
if isinstance(string, text_type):
|
|
string = string.encode(charset, errors)
|
|
if isinstance(safe, text_type):
|
|
safe = safe.encode(charset, errors)
|
|
if isinstance(unsafe, text_type):
|
|
unsafe = unsafe.encode(charset, errors)
|
|
safe = (frozenset(bytearray(safe)) | _always_safe) - frozenset(bytearray(unsafe))
|
|
rv = bytearray()
|
|
for char in bytearray(string):
|
|
if char in safe:
|
|
rv.append(char)
|
|
else:
|
|
rv.extend(_bytetohex[char])
|
|
return to_native(bytes(rv))
|
|
|
|
|
|
def url_quote_plus(string, charset="utf-8", errors="strict", safe=""):
|
|
"""URL encode a single string with the given encoding and convert
|
|
whitespace to "+".
|
|
|
|
:param s: The string to quote.
|
|
:param charset: The charset to be used.
|
|
:param safe: An optional sequence of safe characters.
|
|
"""
|
|
return url_quote(string, charset, errors, safe + " ", "+").replace(" ", "+")
|
|
|
|
|
|
def url_unparse(components):
|
|
"""The reverse operation to :meth:`url_parse`. This accepts arbitrary
|
|
as well as :class:`URL` tuples and returns a URL as a string.
|
|
|
|
:param components: the parsed URL as tuple which should be converted
|
|
into a URL string.
|
|
"""
|
|
scheme, netloc, path, query, fragment = normalize_string_tuple(components)
|
|
s = make_literal_wrapper(scheme)
|
|
url = s("")
|
|
|
|
# We generally treat file:///x and file:/x the same which is also
|
|
# what browsers seem to do. This also allows us to ignore a schema
|
|
# register for netloc utilization or having to differenciate between
|
|
# empty and missing netloc.
|
|
if netloc or (scheme and path.startswith(s("/"))):
|
|
if path and path[:1] != s("/"):
|
|
path = s("/") + path
|
|
url = s("//") + (netloc or s("")) + path
|
|
elif path:
|
|
url += path
|
|
if scheme:
|
|
url = scheme + s(":") + url
|
|
if query:
|
|
url = url + s("?") + query
|
|
if fragment:
|
|
url = url + s("#") + fragment
|
|
return url
|
|
|
|
|
|
def url_unquote(string, charset="utf-8", errors="replace", unsafe=""):
|
|
"""URL decode a single string with a given encoding. If the charset
|
|
is set to `None` no unicode decoding is performed and raw bytes
|
|
are returned.
|
|
|
|
:param s: the string to unquote.
|
|
:param charset: the charset of the query string. If set to `None`
|
|
no unicode decoding will take place.
|
|
:param errors: the error handling for the charset decoding.
|
|
"""
|
|
rv = _unquote_to_bytes(string, unsafe)
|
|
if charset is not None:
|
|
rv = rv.decode(charset, errors)
|
|
return rv
|
|
|
|
|
|
def url_unquote_plus(s, charset="utf-8", errors="replace"):
|
|
"""URL decode a single string with the given `charset` and decode "+" to
|
|
whitespace.
|
|
|
|
Per default encoding errors are ignored. If you want a different behavior
|
|
you can set `errors` to ``'replace'`` or ``'strict'``. In strict mode a
|
|
:exc:`HTTPUnicodeError` is raised.
|
|
|
|
:param s: The string to unquote.
|
|
:param charset: the charset of the query string. If set to `None`
|
|
no unicode decoding will take place.
|
|
:param errors: The error handling for the `charset` decoding.
|
|
"""
|
|
if isinstance(s, text_type):
|
|
s = s.replace(u"+", u" ")
|
|
else:
|
|
s = s.replace(b"+", b" ")
|
|
return url_unquote(s, charset, errors)
|
|
|
|
|
|
def url_fix(s, charset="utf-8"):
|
|
r"""Sometimes you get an URL by a user that just isn't a real URL because
|
|
it contains unsafe characters like ' ' and so on. This function can fix
|
|
some of the problems in a similar way browsers handle data entered by the
|
|
user:
|
|
|
|
>>> url_fix(u'http://de.wikipedia.org/wiki/Elf (Begriffskl\xe4rung)')
|
|
'http://de.wikipedia.org/wiki/Elf%20(Begriffskl%C3%A4rung)'
|
|
|
|
:param s: the string with the URL to fix.
|
|
:param charset: The target charset for the URL if the url was given as
|
|
unicode string.
|
|
"""
|
|
# First step is to switch to unicode processing and to convert
|
|
# backslashes (which are invalid in URLs anyways) to slashes. This is
|
|
# consistent with what Chrome does.
|
|
s = to_unicode(s, charset, "replace").replace("\\", "/")
|
|
|
|
# For the specific case that we look like a malformed windows URL
|
|
# we want to fix this up manually:
|
|
if s.startswith("file://") and s[7:8].isalpha() and s[8:10] in (":/", "|/"):
|
|
s = "file:///" + s[7:]
|
|
|
|
url = url_parse(s)
|
|
path = url_quote(url.path, charset, safe="/%+$!*'(),")
|
|
qs = url_quote_plus(url.query, charset, safe=":&%=+$!*'(),")
|
|
anchor = url_quote_plus(url.fragment, charset, safe=":&%=+$!*'(),")
|
|
return to_native(url_unparse((url.scheme, url.encode_netloc(), path, qs, anchor)))
|
|
|
|
|
|
# not-unreserved characters remain quoted when unquoting to IRI
|
|
_to_iri_unsafe = "".join([chr(c) for c in range(128) if c not in _always_safe])
|
|
|
|
|
|
def _codec_error_url_quote(e):
|
|
"""Used in :func:`uri_to_iri` after unquoting to re-quote any
|
|
invalid bytes.
|
|
"""
|
|
out = _fast_url_quote(e.object[e.start : e.end])
|
|
|
|
if PY2:
|
|
out = out.decode("utf-8")
|
|
|
|
return out, e.end
|
|
|
|
|
|
codecs.register_error("werkzeug.url_quote", _codec_error_url_quote)
|
|
|
|
|
|
def uri_to_iri(uri, charset="utf-8", errors="werkzeug.url_quote"):
|
|
"""Convert a URI to an IRI. All valid UTF-8 characters are unquoted,
|
|
leaving all reserved and invalid characters quoted. If the URL has
|
|
a domain, it is decoded from Punycode.
|
|
|
|
>>> uri_to_iri("http://xn--n3h.net/p%C3%A5th?q=%C3%A8ry%DF")
|
|
'http://\\u2603.net/p\\xe5th?q=\\xe8ry%DF'
|
|
|
|
:param uri: The URI to convert.
|
|
:param charset: The encoding to encode unquoted bytes with.
|
|
:param errors: Error handler to use during ``bytes.encode``. By
|
|
default, invalid bytes are left quoted.
|
|
|
|
.. versionchanged:: 0.15
|
|
All reserved and invalid characters remain quoted. Previously,
|
|
only some reserved characters were preserved, and invalid bytes
|
|
were replaced instead of left quoted.
|
|
|
|
.. versionadded:: 0.6
|
|
"""
|
|
if isinstance(uri, tuple):
|
|
uri = url_unparse(uri)
|
|
|
|
uri = url_parse(to_unicode(uri, charset))
|
|
path = url_unquote(uri.path, charset, errors, _to_iri_unsafe)
|
|
query = url_unquote(uri.query, charset, errors, _to_iri_unsafe)
|
|
fragment = url_unquote(uri.fragment, charset, errors, _to_iri_unsafe)
|
|
return url_unparse((uri.scheme, uri.decode_netloc(), path, query, fragment))
|
|
|
|
|
|
# reserved characters remain unquoted when quoting to URI
|
|
_to_uri_safe = ":/?#[]@!$&'()*+,;=%"
|
|
|
|
|
|
def iri_to_uri(iri, charset="utf-8", errors="strict", safe_conversion=False):
|
|
"""Convert an IRI to a URI. All non-ASCII and unsafe characters are
|
|
quoted. If the URL has a domain, it is encoded to Punycode.
|
|
|
|
>>> iri_to_uri('http://\\u2603.net/p\\xe5th?q=\\xe8ry%DF')
|
|
'http://xn--n3h.net/p%C3%A5th?q=%C3%A8ry%DF'
|
|
|
|
:param iri: The IRI to convert.
|
|
:param charset: The encoding of the IRI.
|
|
:param errors: Error handler to use during ``bytes.encode``.
|
|
:param safe_conversion: Return the URL unchanged if it only contains
|
|
ASCII characters and no whitespace. See the explanation below.
|
|
|
|
There is a general problem with IRI conversion with some protocols
|
|
that are in violation of the URI specification. Consider the
|
|
following two IRIs::
|
|
|
|
magnet:?xt=uri:whatever
|
|
itms-services://?action=download-manifest
|
|
|
|
After parsing, we don't know if the scheme requires the ``//``,
|
|
which is dropped if empty, but conveys different meanings in the
|
|
final URL if it's present or not. In this case, you can use
|
|
``safe_conversion``, which will return the URL unchanged if it only
|
|
contains ASCII characters and no whitespace. This can result in a
|
|
URI with unquoted characters if it was not already quoted correctly,
|
|
but preserves the URL's semantics. Werkzeug uses this for the
|
|
``Location`` header for redirects.
|
|
|
|
.. versionchanged:: 0.15
|
|
All reserved characters remain unquoted. Previously, only some
|
|
reserved characters were left unquoted.
|
|
|
|
.. versionchanged:: 0.9.6
|
|
The ``safe_conversion`` parameter was added.
|
|
|
|
.. versionadded:: 0.6
|
|
"""
|
|
if isinstance(iri, tuple):
|
|
iri = url_unparse(iri)
|
|
|
|
if safe_conversion:
|
|
# If we're not sure if it's safe to convert the URL, and it only
|
|
# contains ASCII characters, return it unconverted.
|
|
try:
|
|
native_iri = to_native(iri)
|
|
ascii_iri = native_iri.encode("ascii")
|
|
|
|
# Only return if it doesn't have whitespace. (Why?)
|
|
if len(ascii_iri.split()) == 1:
|
|
return native_iri
|
|
except UnicodeError:
|
|
pass
|
|
|
|
iri = url_parse(to_unicode(iri, charset, errors))
|
|
path = url_quote(iri.path, charset, errors, _to_uri_safe)
|
|
query = url_quote(iri.query, charset, errors, _to_uri_safe)
|
|
fragment = url_quote(iri.fragment, charset, errors, _to_uri_safe)
|
|
return to_native(
|
|
url_unparse((iri.scheme, iri.encode_netloc(), path, query, fragment))
|
|
)
|
|
|
|
|
|
def url_decode(
|
|
s,
|
|
charset="utf-8",
|
|
decode_keys=False,
|
|
include_empty=True,
|
|
errors="replace",
|
|
separator="&",
|
|
cls=None,
|
|
):
|
|
"""
|
|
Parse a querystring and return it as :class:`MultiDict`. There is a
|
|
difference in key decoding on different Python versions. On Python 3
|
|
keys will always be fully decoded whereas on Python 2, keys will
|
|
remain bytestrings if they fit into ASCII. On 2.x keys can be forced
|
|
to be unicode by setting `decode_keys` to `True`.
|
|
|
|
If the charset is set to `None` no unicode decoding will happen and
|
|
raw bytes will be returned.
|
|
|
|
Per default a missing value for a key will default to an empty key. If
|
|
you don't want that behavior you can set `include_empty` to `False`.
|
|
|
|
Per default encoding errors are ignored. If you want a different behavior
|
|
you can set `errors` to ``'replace'`` or ``'strict'``. In strict mode a
|
|
`HTTPUnicodeError` is raised.
|
|
|
|
.. versionchanged:: 0.5
|
|
In previous versions ";" and "&" could be used for url decoding.
|
|
This changed in 0.5 where only "&" is supported. If you want to
|
|
use ";" instead a different `separator` can be provided.
|
|
|
|
The `cls` parameter was added.
|
|
|
|
:param s: a string with the query string to decode.
|
|
:param charset: the charset of the query string. If set to `None`
|
|
no unicode decoding will take place.
|
|
:param decode_keys: Used on Python 2.x to control whether keys should
|
|
be forced to be unicode objects. If set to `True`
|
|
then keys will be unicode in all cases. Otherwise,
|
|
they remain `str` if they fit into ASCII.
|
|
:param include_empty: Set to `False` if you don't want empty values to
|
|
appear in the dict.
|
|
:param errors: the decoding error behavior.
|
|
:param separator: the pair separator to be used, defaults to ``&``
|
|
:param cls: an optional dict class to use. If this is not specified
|
|
or `None` the default :class:`MultiDict` is used.
|
|
"""
|
|
if cls is None:
|
|
cls = MultiDict
|
|
if isinstance(s, text_type) and not isinstance(separator, text_type):
|
|
separator = separator.decode(charset or "ascii")
|
|
elif isinstance(s, bytes) and not isinstance(separator, bytes):
|
|
separator = separator.encode(charset or "ascii")
|
|
return cls(
|
|
_url_decode_impl(
|
|
s.split(separator), charset, decode_keys, include_empty, errors
|
|
)
|
|
)
|
|
|
|
|
|
def url_decode_stream(
|
|
stream,
|
|
charset="utf-8",
|
|
decode_keys=False,
|
|
include_empty=True,
|
|
errors="replace",
|
|
separator="&",
|
|
cls=None,
|
|
limit=None,
|
|
return_iterator=False,
|
|
):
|
|
"""Works like :func:`url_decode` but decodes a stream. The behavior
|
|
of stream and limit follows functions like
|
|
:func:`~werkzeug.wsgi.make_line_iter`. The generator of pairs is
|
|
directly fed to the `cls` so you can consume the data while it's
|
|
parsed.
|
|
|
|
.. versionadded:: 0.8
|
|
|
|
:param stream: a stream with the encoded querystring
|
|
:param charset: the charset of the query string. If set to `None`
|
|
no unicode decoding will take place.
|
|
:param decode_keys: Used on Python 2.x to control whether keys should
|
|
be forced to be unicode objects. If set to `True`,
|
|
keys will be unicode in all cases. Otherwise, they
|
|
remain `str` if they fit into ASCII.
|
|
:param include_empty: Set to `False` if you don't want empty values to
|
|
appear in the dict.
|
|
:param errors: the decoding error behavior.
|
|
:param separator: the pair separator to be used, defaults to ``&``
|
|
:param cls: an optional dict class to use. If this is not specified
|
|
or `None` the default :class:`MultiDict` is used.
|
|
:param limit: the content length of the URL data. Not necessary if
|
|
a limited stream is provided.
|
|
:param return_iterator: if set to `True` the `cls` argument is ignored
|
|
and an iterator over all decoded pairs is
|
|
returned
|
|
"""
|
|
from .wsgi import make_chunk_iter
|
|
|
|
pair_iter = make_chunk_iter(stream, separator, limit)
|
|
decoder = _url_decode_impl(pair_iter, charset, decode_keys, include_empty, errors)
|
|
|
|
if return_iterator:
|
|
return decoder
|
|
|
|
if cls is None:
|
|
cls = MultiDict
|
|
|
|
return cls(decoder)
|
|
|
|
|
|
def _url_decode_impl(pair_iter, charset, decode_keys, include_empty, errors):
|
|
for pair in pair_iter:
|
|
if not pair:
|
|
continue
|
|
s = make_literal_wrapper(pair)
|
|
equal = s("=")
|
|
if equal in pair:
|
|
key, value = pair.split(equal, 1)
|
|
else:
|
|
if not include_empty:
|
|
continue
|
|
key = pair
|
|
value = s("")
|
|
key = url_unquote_plus(key, charset, errors)
|
|
if charset is not None and PY2 and not decode_keys:
|
|
key = try_coerce_native(key)
|
|
yield key, url_unquote_plus(value, charset, errors)
|
|
|
|
|
|
def url_encode(
|
|
obj, charset="utf-8", encode_keys=False, sort=False, key=None, separator=b"&"
|
|
):
|
|
"""URL encode a dict/`MultiDict`. If a value is `None` it will not appear
|
|
in the result string. Per default only values are encoded into the target
|
|
charset strings. If `encode_keys` is set to ``True`` unicode keys are
|
|
supported too.
|
|
|
|
If `sort` is set to `True` the items are sorted by `key` or the default
|
|
sorting algorithm.
|
|
|
|
.. versionadded:: 0.5
|
|
`sort`, `key`, and `separator` were added.
|
|
|
|
:param obj: the object to encode into a query string.
|
|
:param charset: the charset of the query string.
|
|
:param encode_keys: set to `True` if you have unicode keys. (Ignored on
|
|
Python 3.x)
|
|
:param sort: set to `True` if you want parameters to be sorted by `key`.
|
|
:param separator: the separator to be used for the pairs.
|
|
:param key: an optional function to be used for sorting. For more details
|
|
check out the :func:`sorted` documentation.
|
|
"""
|
|
separator = to_native(separator, "ascii")
|
|
return separator.join(_url_encode_impl(obj, charset, encode_keys, sort, key))
|
|
|
|
|
|
def url_encode_stream(
|
|
obj,
|
|
stream=None,
|
|
charset="utf-8",
|
|
encode_keys=False,
|
|
sort=False,
|
|
key=None,
|
|
separator=b"&",
|
|
):
|
|
"""Like :meth:`url_encode` but writes the results to a stream
|
|
object. If the stream is `None` a generator over all encoded
|
|
pairs is returned.
|
|
|
|
.. versionadded:: 0.8
|
|
|
|
:param obj: the object to encode into a query string.
|
|
:param stream: a stream to write the encoded object into or `None` if
|
|
an iterator over the encoded pairs should be returned. In
|
|
that case the separator argument is ignored.
|
|
:param charset: the charset of the query string.
|
|
:param encode_keys: set to `True` if you have unicode keys. (Ignored on
|
|
Python 3.x)
|
|
:param sort: set to `True` if you want parameters to be sorted by `key`.
|
|
:param separator: the separator to be used for the pairs.
|
|
:param key: an optional function to be used for sorting. For more details
|
|
check out the :func:`sorted` documentation.
|
|
"""
|
|
separator = to_native(separator, "ascii")
|
|
gen = _url_encode_impl(obj, charset, encode_keys, sort, key)
|
|
if stream is None:
|
|
return gen
|
|
for idx, chunk in enumerate(gen):
|
|
if idx:
|
|
stream.write(separator)
|
|
stream.write(chunk)
|
|
|
|
|
|
def url_join(base, url, allow_fragments=True):
|
|
"""Join a base URL and a possibly relative URL to form an absolute
|
|
interpretation of the latter.
|
|
|
|
:param base: the base URL for the join operation.
|
|
:param url: the URL to join.
|
|
:param allow_fragments: indicates whether fragments should be allowed.
|
|
"""
|
|
if isinstance(base, tuple):
|
|
base = url_unparse(base)
|
|
if isinstance(url, tuple):
|
|
url = url_unparse(url)
|
|
|
|
base, url = normalize_string_tuple((base, url))
|
|
s = make_literal_wrapper(base)
|
|
|
|
if not base:
|
|
return url
|
|
if not url:
|
|
return base
|
|
|
|
bscheme, bnetloc, bpath, bquery, bfragment = url_parse(
|
|
base, allow_fragments=allow_fragments
|
|
)
|
|
scheme, netloc, path, query, fragment = url_parse(url, bscheme, allow_fragments)
|
|
if scheme != bscheme:
|
|
return url
|
|
if netloc:
|
|
return url_unparse((scheme, netloc, path, query, fragment))
|
|
netloc = bnetloc
|
|
|
|
if path[:1] == s("/"):
|
|
segments = path.split(s("/"))
|
|
elif not path:
|
|
segments = bpath.split(s("/"))
|
|
if not query:
|
|
query = bquery
|
|
else:
|
|
segments = bpath.split(s("/"))[:-1] + path.split(s("/"))
|
|
|
|
# If the rightmost part is "./" we want to keep the slash but
|
|
# remove the dot.
|
|
if segments[-1] == s("."):
|
|
segments[-1] = s("")
|
|
|
|
# Resolve ".." and "."
|
|
segments = [segment for segment in segments if segment != s(".")]
|
|
while 1:
|
|
i = 1
|
|
n = len(segments) - 1
|
|
while i < n:
|
|
if segments[i] == s("..") and segments[i - 1] not in (s(""), s("..")):
|
|
del segments[i - 1 : i + 1]
|
|
break
|
|
i += 1
|
|
else:
|
|
break
|
|
|
|
# Remove trailing ".." if the URL is absolute
|
|
unwanted_marker = [s(""), s("..")]
|
|
while segments[:2] == unwanted_marker:
|
|
del segments[1]
|
|
|
|
path = s("/").join(segments)
|
|
return url_unparse((scheme, netloc, path, query, fragment))
|
|
|
|
|
|
class Href(object):
|
|
"""Implements a callable that constructs URLs with the given base. The
|
|
function can be called with any number of positional and keyword
|
|
arguments which than are used to assemble the URL. Works with URLs
|
|
and posix paths.
|
|
|
|
Positional arguments are appended as individual segments to
|
|
the path of the URL:
|
|
|
|
>>> href = Href('/foo')
|
|
>>> href('bar', 23)
|
|
'/foo/bar/23'
|
|
>>> href('foo', bar=23)
|
|
'/foo/foo?bar=23'
|
|
|
|
If any of the arguments (positional or keyword) evaluates to `None` it
|
|
will be skipped. If no keyword arguments are given the last argument
|
|
can be a :class:`dict` or :class:`MultiDict` (or any other dict subclass),
|
|
otherwise the keyword arguments are used for the query parameters, cutting
|
|
off the first trailing underscore of the parameter name:
|
|
|
|
>>> href(is_=42)
|
|
'/foo?is=42'
|
|
>>> href({'foo': 'bar'})
|
|
'/foo?foo=bar'
|
|
|
|
Combining of both methods is not allowed:
|
|
|
|
>>> href({'foo': 'bar'}, bar=42)
|
|
Traceback (most recent call last):
|
|
...
|
|
TypeError: keyword arguments and query-dicts can't be combined
|
|
|
|
Accessing attributes on the href object creates a new href object with
|
|
the attribute name as prefix:
|
|
|
|
>>> bar_href = href.bar
|
|
>>> bar_href("blub")
|
|
'/foo/bar/blub'
|
|
|
|
If `sort` is set to `True` the items are sorted by `key` or the default
|
|
sorting algorithm:
|
|
|
|
>>> href = Href("/", sort=True)
|
|
>>> href(a=1, b=2, c=3)
|
|
'/?a=1&b=2&c=3'
|
|
|
|
.. versionadded:: 0.5
|
|
`sort` and `key` were added.
|
|
"""
|
|
|
|
def __init__(self, base="./", charset="utf-8", sort=False, key=None):
|
|
if not base:
|
|
base = "./"
|
|
self.base = base
|
|
self.charset = charset
|
|
self.sort = sort
|
|
self.key = key
|
|
|
|
def __getattr__(self, name):
|
|
if name[:2] == "__":
|
|
raise AttributeError(name)
|
|
base = self.base
|
|
if base[-1:] != "/":
|
|
base += "/"
|
|
return Href(url_join(base, name), self.charset, self.sort, self.key)
|
|
|
|
def __call__(self, *path, **query):
|
|
if path and isinstance(path[-1], dict):
|
|
if query:
|
|
raise TypeError("keyword arguments and query-dicts can't be combined")
|
|
query, path = path[-1], path[:-1]
|
|
elif query:
|
|
query = dict(
|
|
[(k.endswith("_") and k[:-1] or k, v) for k, v in query.items()]
|
|
)
|
|
path = "/".join(
|
|
[
|
|
to_unicode(url_quote(x, self.charset), "ascii")
|
|
for x in path
|
|
if x is not None
|
|
]
|
|
).lstrip("/")
|
|
rv = self.base
|
|
if path:
|
|
if not rv.endswith("/"):
|
|
rv += "/"
|
|
rv = url_join(rv, "./" + path)
|
|
if query:
|
|
rv += "?" + to_unicode(
|
|
url_encode(query, self.charset, sort=self.sort, key=self.key), "ascii"
|
|
)
|
|
return to_native(rv)
|
|
|