883 lines
31 KiB
Python
883 lines
31 KiB
Python
# -*- coding: utf-8 -*-
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"""
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werkzeug.urls
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~~~~~~~~~~~~~
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This module implements various URL related functions.
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:copyright: (c) 2013 by the Werkzeug Team, see AUTHORS for more details.
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:license: BSD, see LICENSE for more details.
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"""
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import re
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from werkzeug._compat import text_type, PY2, to_unicode, \
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to_native, implements_to_string, try_coerce_native, \
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normalize_string_tuple, make_literal_wrapper, \
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fix_tuple_repr
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from werkzeug._internal import _encode_idna, _decode_idna
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from werkzeug.datastructures import MultiDict, iter_multi_items
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from collections import namedtuple
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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 = (b'abcdefghijklmnopqrstuvwxyz'
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b'ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_.-+')
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_hexdigits = '0123456789ABCDEFabcdef'
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_hextobyte = dict(
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((a + b).encode(), int(a + b, 16))
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for a in _hexdigits for b in _hexdigits
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)
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_URLTuple = fix_tuple_repr(namedtuple('_URLTuple',
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['scheme', 'netloc', 'path', 'query', 'fragment']))
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class _URLMixin(object):
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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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rv = _encode_idna(rv)
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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(filter(None, [
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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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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 _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(_URLTuple, _URLMixin):
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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(filter(None, [
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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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if auth:
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rv = '%s@%s' % (auth, rv)
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return rv.encode('ascii')
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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(_URLTuple, _URLMixin):
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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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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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bits = iter(string.split(b'%'))
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result = bytearray(next(bits, b''))
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for item in bits:
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try:
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char = _hextobyte[item[:2]]
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if char in unsafe:
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raise KeyError()
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result.append(char)
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result.extend(item[2:])
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except KeyError:
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result.extend(b'%')
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result.extend(item)
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return bytes(result)
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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 url_quote(key) + '=' + url_quote_plus(value)
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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',
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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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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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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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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 = is_text_based and URL or BytesURL
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return result_type(scheme, netloc, url, query, fragment)
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def url_quote(string, charset='utf-8', errors='strict', safe='/:', unsafe=''):
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"""URL encode a single string with a given encoding.
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:param s: the string to quote.
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:param charset: the charset to be used.
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:param safe: an optional sequence of safe characters.
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:param unsafe: an optional sequence of unsafe characters.
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.. versionadded:: 0.9.2
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The `unsafe` parameter was added.
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"""
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if not isinstance(string, (text_type, bytes, bytearray)):
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string = text_type(string)
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if isinstance(string, text_type):
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string = string.encode(charset, errors)
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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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rv = bytearray()
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for char in bytearray(string):
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if char in safe:
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rv.append(char)
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else:
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rv.extend(('%%%02X' % char).encode('ascii'))
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return to_native(bytes(rv))
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def url_quote_plus(string, charset='utf-8', errors='strict', safe=''):
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"""URL encode a single string with the given encoding and convert
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whitespace to "+".
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:param s: The string to quote.
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:param charset: The charset to be used.
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:param safe: An optional sequence of safe characters.
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"""
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return url_quote(string, charset, errors, safe + ' ', '+').replace(' ', '+')
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def url_unparse(components):
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"""The reverse operation to :meth:`url_parse`. This accepts arbitrary
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as well as :class:`URL` tuples and returns a URL as a string.
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:param components: the parsed URL as tuple which should be converted
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into a URL string.
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"""
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scheme, netloc, path, query, fragment = \
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normalize_string_tuple(components)
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s = make_literal_wrapper(scheme)
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url = s('')
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# We generally treat file:///x and file:/x the same which is also
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# what browsers seem to do. This also allows us to ignore a schema
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# register for netloc utilization or having to differenciate between
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# empty and missing netloc.
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if netloc or (scheme and path.startswith(s('/'))):
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if path and path[:1] != s('/'):
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path = s('/') + path
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url = s('//') + (netloc or s('')) + path
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elif path:
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url += path
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if scheme:
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url = scheme + s(':') + url
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if query:
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url = url + s('?') + query
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if fragment:
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url = url + s('#') + fragment
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return url
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def url_unquote(string, charset='utf-8', errors='replace', unsafe=''):
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"""URL decode a single string with a given encoding. If the charset
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is set to `None` no unicode decoding is performed and raw bytes
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are returned.
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:param s: the string to unquote.
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:param charset: the charset of the query string. If set to `None`
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no unicode decoding will take place.
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:param errors: the error handling for the charset decoding.
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"""
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rv = _unquote_to_bytes(string, unsafe)
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if charset is not None:
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rv = rv.decode(charset, errors)
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return rv
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def url_unquote_plus(s, charset='utf-8', errors='replace'):
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"""URL decode a single string with the given `charset` and decode "+" to
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whitespace.
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Per default encoding errors are ignored. If you want a different behavior
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you can set `errors` to ``'replace'`` or ``'strict'``. In strict mode a
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:exc:`HTTPUnicodeError` is raised.
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:param s: The string to unquote.
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:param charset: the charset of the query string. If set to `None`
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no unicode decoding will take place.
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:param errors: The error handling for the `charset` decoding.
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"""
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if isinstance(s, text_type):
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s = s.replace(u'+', u' ')
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else:
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s = s.replace(b'+', b' ')
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return url_unquote(s, charset, errors)
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def url_fix(s, charset='utf-8'):
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r"""Sometimes you get an URL by a user that just isn't a real URL because
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it contains unsafe characters like ' ' and so on. This function can fix
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some of the problems in a similar way browsers handle data entered by the
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user:
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>>> url_fix(u'http://de.wikipedia.org/wiki/Elf (Begriffskl\xe4rung)')
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'http://de.wikipedia.org/wiki/Elf%20(Begriffskl%C3%A4rung)'
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:param s: the string with the URL to fix.
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:param charset: The target charset for the URL if the url was given as
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unicode string.
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"""
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scheme, netloc, path, qs, anchor = url_parse(to_unicode(s, charset, 'replace'))
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path = url_quote(path, charset, safe='/%+$!*\'(),')
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qs = url_quote_plus(qs, charset, safe=':&%=+$!*\'(),')
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return to_native(url_unparse((scheme, netloc, path, qs, anchor)))
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def uri_to_iri(uri, charset='utf-8', errors='replace'):
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r"""
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Converts a URI in a given charset to a IRI.
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Examples for URI versus IRI:
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>>> uri_to_iri(b'http://xn--n3h.net/')
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u'http://\u2603.net/'
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>>> uri_to_iri(b'http://%C3%BCser:p%C3%A4ssword@xn--n3h.net/p%C3%A5th')
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u'http://\xfcser:p\xe4ssword@\u2603.net/p\xe5th'
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Query strings are left unchanged:
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|
|
>>> uri_to_iri('/?foo=24&x=%26%2f')
|
|
u'/?foo=24&x=%26%2f'
|
|
|
|
.. versionadded:: 0.6
|
|
|
|
:param uri: The URI to convert.
|
|
:param charset: The charset of the URI.
|
|
:param errors: The error handling on decode.
|
|
"""
|
|
if isinstance(uri, tuple):
|
|
uri = url_unparse(uri)
|
|
uri = url_parse(to_unicode(uri, charset))
|
|
path = url_unquote(uri.path, charset, errors, '%/;?')
|
|
query = url_unquote(uri.query, charset, errors, '%;/?:@&=+,$')
|
|
fragment = url_unquote(uri.fragment, charset, errors, '%;/?:@&=+,$')
|
|
return url_unparse((uri.scheme, uri.decode_netloc(),
|
|
path, query, fragment))
|
|
|
|
|
|
def iri_to_uri(iri, charset='utf-8', errors='strict'):
|
|
r"""
|
|
Converts any unicode based IRI to an acceptable ASCII URI. Werkzeug always
|
|
uses utf-8 URLs internally because this is what browsers and HTTP do as
|
|
well. In some places where it accepts an URL it also accepts a unicode IRI
|
|
and converts it into a URI.
|
|
|
|
Examples for IRI versus URI:
|
|
|
|
>>> iri_to_uri(u'http://☃.net/')
|
|
'http://xn--n3h.net/'
|
|
>>> iri_to_uri(u'http://üser:pässword@☃.net/påth')
|
|
'http://%C3%BCser:p%C3%A4ssword@xn--n3h.net/p%C3%A5th'
|
|
|
|
.. versionadded:: 0.6
|
|
|
|
:param iri: The IRI to convert.
|
|
:param charset: The charset for the URI.
|
|
"""
|
|
if isinstance(iri, tuple):
|
|
iri = url_unparse(iri)
|
|
iri = url_parse(to_unicode(iri, charset, errors))
|
|
|
|
netloc = iri.encode_netloc().decode('ascii')
|
|
path = url_quote(iri.path, charset, errors, '/:~+%')
|
|
query = url_quote(iri.query, charset, errors, '%&[]:;$*()+,!?*/=')
|
|
fragment = url_quote(iri.fragment, charset, errors, '=%&[]:;$()+,!?*/')
|
|
|
|
return to_native(url_unparse((iri.scheme, 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 werkzeug.wsgi import make_chunk_iter
|
|
if return_iterator:
|
|
cls = lambda x: x
|
|
elif cls is None:
|
|
cls = MultiDict
|
|
pair_iter = make_chunk_iter(stream, separator, limit)
|
|
return cls(_url_decode_impl(pair_iter, charset, decode_keys,
|
|
include_empty, errors))
|
|
|
|
|
|
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)
|