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Initial commit
2019-11-17 12:44:16 +01:00
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werkzeug.http
~~~~~~~~~~~~~
Werkzeug comes with a bunch of utilities that help Werkzeug to deal with
HTTP data. Most of the classes and functions provided by this module are
used by the wrappers, but they are useful on their own, too, especially if
the response and request objects are not used.
This covers some of the more HTTP centric features of WSGI, some other
utilities such as cookie handling are documented in the `werkzeug.utils`
module.
:copyright: 2007 Pallets
:license: BSD-3-Clause
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z<EFBFBD>Unquotes a header value. (Reversal of :func:`quote_header_value`).
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>>> dump_header({'foo': 'bar baz'})
'foo="bar baz"'
>>> dump_header(('foo', 'bar baz'))
'foo, "bar baz"'
:param iterable: the iterable or dict of values to quote.
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See :func:`quote_header_value` for more details.
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In particular, parse comma-separated lists where the elements of
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contain a comma. A non-quoted string could have quotes in the
middle. Quotes are removed automatically after parsing.
It basically works like :func:`parse_set_header` just that items
may appear multiple times and case sensitivity is preserved.
The return value is a standard :class:`list`:
>>> parse_list_header('token, "quoted value"')
['token', 'quoted value']
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:param value: a string with a list header.
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NrrKrC)<03>_parse_list_headerrNrO)rH<00>result<6C>itemr:r:r;<00>parse_list_header3s (r`cCs<>|<01>}t|t<01>st|<00>}xrt|<00>D]f}d|kr8d||<q"|<03>dd<03>\}}|dd<03>|dd<02>krldkr<>nnt|dd<04><00>}|||<q"W|S)aKParse lists of key, value pairs as described by RFC 2068 Section 2 and
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>>> d = parse_dict_header('foo="is a fish", bar="as well"')
>>> type(d) is dict
True
>>> sorted(d.items())
[('bar', 'as well'), ('foo', 'is a fish')]
If there is no value for a key it will be `None`:
>>> parse_dict_header('key_without_value')
{'key_without_value': None}
To create a header from the :class:`dict` again, use the
:func:`dump_header` function.
.. versionchanged:: 0.9
Added support for `cls` argument.
:param value: a string with a dict header.
:param cls: callable to use for storage of parsed results.
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|d<01>| ||<n| ||<||<07> <0B>d<06>}q^W|<02>|<04>|dk<08>r"t |<02>S|}q$W|<02>r8t |<02>SdifS) u<>Parse a ``Content-Type`` like header into a tuple with the content
type and the options:
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('text/html', {'charset': 'utf8'})
This should not be used to parse ``Cache-Control`` like headers that use
a slightly different format. For these headers use the
:func:`parse_dict_header` function.
.. versionchanged:: 0.15
:rfc:`2231` parameter continuations are handled.
.. versionadded:: 0.5
:param value: the header to parse.
:param multiple: Whether try to parse and return multiple MIME types
:return: (mimetype, options) or (mimetype, options, mimetype, options, …)
if multiple=True
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valid algorithm but one that supports at least value and quality
extraction.
Returns a new :class:`Accept` object (basically a list of ``(value, quality)``
tuples sorted by the quality with some additional accessor methods).
The second parameter can be a subclass of :class:`Accept` that is created
with the parsed values and returned.
:param value: the accept header string to be parsed.
:param cls: the wrapper class for the return value (can be
:class:`Accept` or a subclass thereof)
:return: an instance of `cls`.
NrLrr)<08>Accept<70>
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request cache control, this method does not. It's your responsibility
to not use the wrong control statements.
.. versionadded:: 0.5
The `cls` was added. If not specified an immutable
:class:`~werkzeug.datastructures.RequestCacheControl` is returned.
:param value: a cache control header to be parsed.
:param on_update: an optional callable that is called every time a value
on the :class:`~werkzeug.datastructures.CacheControl`
object is changed.
:param cls: the class for the returned object. By default
:class:`~werkzeug.datastructures.RequestCacheControl` is used.
:return: a `cls` object.
N)<02>RequestCacheControlre)rH<00> on_updatercr:r:r;<00>parse_cache_control_header<65>s

r<>cCs|std|<01>Stt|<00>|<01>S)aParse a set-like header and return a
:class:`~werkzeug.datastructures.HeaderSet` object:
>>> hs = parse_set_header('token, "quoted value"')
The return value is an object that treats the items case-insensitively
and keeps the order of the items:
>>> 'TOKEN' in hs
True
>>> hs.index('quoted value')
1
>>> hs
HeaderSet(['token', 'quoted value'])
To create a header from the :class:`HeaderSet` again, use the
:func:`dump_header` function.
:param value: a set header to be parsed.
:param on_update: an optional callable that is called every time a
value on the :class:`~werkzeug.datastructures.HeaderSet`
object is changed.
:return: a :class:`~werkzeug.datastructures.HeaderSet`
N)<02> HeaderSetr`)rHr<>r:r:r;<00>parse_set_header<65>s
r<>cCs<>|sdSt|<00>}y|<00>dd<02>\}}|<01><02>}Wntk
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<EFBFBD>r<>|<05> d <0B>s<>dStd |<05>SdS) awParse an HTTP basic/digest authorization header transmitted by the web
browser. The return value is either `None` if the header was invalid or
not given, otherwise an :class:`~werkzeug.datastructures.Authorization`
object.
:param value: the authorization header to parse.
:return: a :class:`~werkzeug.datastructures.Authorization` object or `None`.
Nrsbasic<69>:<3A>basic)<02>username<6D>passwordsdigest)r<><00>realm<6C>nonce<63>uri<72>response<73>qop<6F>nc<6E>cnonce<63>digest) r<rb<00>lower<65>
ValueError<EFBFBD>base64<36> b64decode<64> Exception<6F> Authorizationr<00>_basic_auth_charsetrero)rH<00> auth_type<70> auth_infor<6F>r<>Zauth_maprTr:r:r;<00>parse_authorization_headers4  
r<>c Csd|st|d<01>Sy|<00>dd<03>\}}|<02><02>}Wn(ttfk
rRt|<00><05><00><02>|d<01>SXt|t|<03>|<01>S)a<>Parse an HTTP WWW-Authenticate header into a
:class:`~werkzeug.datastructures.WWWAuthenticate` object.
:param value: a WWW-Authenticate header to parse.
:param on_update: an optional callable that is called every time a value
on the :class:`~werkzeug.datastructures.WWWAuthenticate`
object is changed.
:return: a :class:`~werkzeug.datastructures.WWWAuthenticate` object.
)r<>Nr)<07>WWWAuthenticaterbr<>r<><00>AttributeError<6F>stripre)rHr<>r<>r<>r:r:r;<00>parse_www_authenticate_headerAs

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t<00>St|<00>}|dk r$t|d<02>Stt|<00>d<00>S)z<>Parses an if-range header which can be an etag or a date. Returns
a :class:`~werkzeug.datastructures.IfRange` object.
.. versionadded:: 0.7
N)<01>dater)<03>IfRange<67>
parse_date<EFBFBD> unquote_etag)rHr<>r:r:r;<00>parse_if_range_headerUs 
r<>c CsB|r d|krdSg}d}|<00>dd<04>\}}|<04><01><00><02>}<04>x|<05>d<05>D]<5D>}|<06><01>}d|krZdS|<06>d<06>r<>|dkrpdSy t|<06>}Wntk
r<EFBFBD>dSXd}d}n<>d|k<06>r&|<06>dd<04>\}}|<07><01>}|<08><01>}|<07><06>s<>dSt|<07>}||ks<>|dkr<>dS|<08>r|<08><06><00>sdSt|<08>d}||k<05>r"dSnd}|}|<02>||f<02>qBWt||<02>S)aParses a range header into a :class:`~werkzeug.datastructures.Range`
object. If the header is missing or malformed `None` is returned.
`ranges` is a list of ``(start, stop)`` tuples where the ranges are
non-inclusive.
.. versionadded:: 0.7
raNrrrf<00>-rK) rbr<>r<><00>
startswith<EFBFBD>intr<74><00>isdigitrO<00>Range) rHZmake_inclusive<76>rangesZlast_end<6E>units<74>rngr_<00>beginrpr:r:r;<00>parse_range_headerdsL  
 

 
r<>cCs|dkr dSy|pd<02><00><00>dd<03>\}}Wntk
r<dSXd|krJdS|<03>dd<03>\}}|dkrhd}n|<05><03>rzt|<05>}ndS|dkr<>t|dd||d<06>Sd|kr<>dS|<04>dd<03>\}}yt|<06>}t|<07>d}Wntk
r<EFBFBD>dSXt|||<05><03>rt|||||d<06>SdS)a<>Parses a range header into a
:class:`~werkzeug.datastructures.ContentRange` object or `None` if
parsing is not possible.
.. versionadded:: 0.7
:param value: a content range header to be parsed.
:param on_update: an optional callable that is called every time a value
on the :class:`~werkzeug.datastructures.ContentRange`
object is changed.
NrAr<00>/<2F>*)r<>r<>)r<>rbr<>r<>r<><00> ContentRange<67>is_byte_range_valid)rHr<>r<>Zrangedefr<66><00>length<74>start<72>stopr:r:r;<00>parse_content_range_header<65>s4 
r<>cCs(d|krtd<02><01>d|}|r$d|}|S)ziQuote an etag.
:param etag: the etag to quote.
:param weak: set to `True` to tag it "weak".
rCz invalid etagz"%s"zW/)r<>)<02>etag<61>weakr:r:r;<00>
quote_etag<EFBFBD>s r<>cCsj|sdS|<00><00>}d}|<00>d<03>r.d}|dd<06>}|dd<07>|dd<06>krRd krbnn |dd<08>}||fS)
z<EFBFBD>Unquote a single etag:
>>> unquote_etag('W/"bar"')
('bar', True)
>>> unquote_etag('"bar"')
('bar', False)
:param etag: the etag identifier to unquote.
:return: a ``(etag, weak)`` tuple.
)NNF)zW/zw/TrLNrrKrC)r<>r<>)r<>r<>r:r:r;r<><00>s 
 ( r<>c Cs<>|s
t<00>Sg}g}t|<00>}d}xl||kr<>t<02>||<04>}|dkr>P|<05><04>\}}}|dkr^tdd<05>S|rf|}|rv|<02>|<08>n
|<01>|<08>|<05><06>}q Wt||<02>S)z<>Parse an etag header.
:param value: the tag header to parse
:return: an :class:`~werkzeug.datastructures.ETags` object.
rNr<4E>T)Zstar_tag)<07>ETags<67>len<65>_etag_rerjrmrOrp) rH<00>strongr<67>rp<00>posrjZis_weak<61>quoted<65>rawr:r:r;<00> parse_etags<67>s(
 
 
 r<>cCs t|<00><01><01>S)zGenerate an etag for some data.)r<00> hexdigest)r9r:r:r;<00> generate_etagsr<>c Cs<>|r<>t|<00><01><00>}|dk r<>yb|d}|dkr<|dkr<|d7}n|dkrT|dkrT|d7}t|f|dd <09><00>t|d
ptdd <0B>Sttfk
r<EFBFBD>dSXdS) a<>Parse one of the following date formats into a datetime object:
.. sourcecode:: text
Sun, 06 Nov 1994 08:49:37 GMT ; RFC 822, updated by RFC 1123
Sunday, 06-Nov-94 08:49:37 GMT ; RFC 850, obsoleted by RFC 1036
Sun Nov 6 08:49:37 1994 ; ANSI C's asctime() format
If parsing fails the return value is `None`.
:param value: a string with a supported date format.
:return: a :class:`datetime.datetime` object.
Nr<00>Di<><00>E<00>cilr<00>rK)<01>seconds)rr<>rrr<><00> OverflowError)rH<00>t<>yearr:r:r;r<> s 
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Csr|dkrt<00>}n*t|t<02>r$|<00><03>}nt|ttf<02>r:t|<00>}dd|j|j|d|jd|t |j
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t|d<01>S)a<>Formats the time to ensure compatibility with Netscape's cookie
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Accepts a floating point number expressed in seconds since the epoch in, a
datetime object or a timetuple. All times in UTC. The :func:`parse_date`
function can be used to parse such a date.
Outputs a string in the format ``Wdy, DD-Mon-YYYY HH:MM:SS GMT``.
:param expires: If provided that date is used, otherwise the current.
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t|d<01>S)a<>Formats the time to match the RFC1123 date format.
Accepts a floating point number expressed in seconds since the epoch in, a
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Outputs a string in the format ``Wdy, DD Mon YYYY HH:MM:SS GMT``.
:param timestamp: If provided that date is used, otherwise the current.
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r<>cCsJ|dkr dSt|t<01>r*|j|jdd}t|<00>}|dkrBtd<05><01>t|<00>S)z<>Formats the duration as a base-10 integer.
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:param last_modified: an optional date of the last modification.
:param ignore_if_range: If `False`, `If-Range` header will be taken into
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:return: `True` if the resource was modified, otherwise `False`.
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.. versionchanged:: 0.5
added `allowed` parameter.
:param headers: a list or :class:`Headers` object.
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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.
.. versionchanged:: 0.5
This function now returns a :class:`TypeConversionDict` instead of a
regular dict. The `cls` parameter was added.
:param header: the header to be used to parse the cookie. Alternatively
this can be a WSGI environment.
:param charset: the charset for the cookie values.
:param errors: the error behavior for the charset decoding.
:param cls: an optional dict class to use. If this is not specified
or `None` the default :class:`TypeConversionDict` is
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The parameters are the same as in the cookie Morsel object in the
Python standard library but it accepts unicode data, too.
On Python 3 the return value of this function will be a unicode
string, on Python 2 it will be a native string. In both cases the
return value is usually restricted to ascii as the vast majority of
values are properly escaped, but that is no guarantee. If a unicode
string is returned it's tunneled through latin1 as required by
PEP 3333.
The return value is not ASCII safe if the key contains unicode
characters. This is technically against the specification but
happens in the wild. It's strongly recommended to not use
non-ASCII values for the keys.
:param max_age: should be a number of seconds, or `None` (default) if
the cookie should last only as long as the client's
browser session. Additionally `timedelta` objects
are accepted, too.
:param expires: should be a `datetime` object or unix timestamp.
:param path: limits the cookie to a given path, per default it will
span the whole domain.
:param domain: Use this if you want to set a cross-domain cookie. For
example, ``domain=".example.com"`` will set a cookie
that is readable by the domain ``www.example.com``,
``foo.example.com`` etc. Otherwise, a cookie will only
be readable by the domain that set it.
:param secure: The cookie will only be available via HTTPS
:param httponly: disallow JavaScript to access the cookie. This is an
extension to the cookie standard and probably not
supported by all browsers.
:param charset: the encoding for unicode values.
:param sync_expires: automatically set expires if max_age is defined
but expires not.
:param max_size: Warn if the final header value exceeds this size. The
default, 4093, should be safely `supported by most browsers
<cookie_>`_. Set to 0 to disable this check.
:param samesite: Limits the scope of the cookie such that it will only
be attached to requests if those requests are "same-site".
.. _`cookie`: http://browsercookielimits.squawky.net/
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r"cCsp|dk|dkkrdS|dkr,|dkp*|dkS|dkrLd|koF|kSS||krXdSd|koj|kSS)zcChecks if a given byte content range is valid for the given length.
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