583 lines
20 KiB
Python
583 lines
20 KiB
Python
####
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# Copyright 2000 by Timothy O'Malley <timo@alum.mit.edu>
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#
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# All Rights Reserved
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#
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# Permission to use, copy, modify, and distribute this software
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# and its documentation for any purpose and without fee is hereby
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# granted, provided that the above copyright notice appear in all
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# copies and that both that copyright notice and this permission
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# notice appear in supporting documentation, and that the name of
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# Timothy O'Malley not be used in advertising or publicity
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# pertaining to distribution of the software without specific, written
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# prior permission.
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#
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# Timothy O'Malley DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS
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# SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
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# AND FITNESS, IN NO EVENT SHALL Timothy O'Malley BE LIABLE FOR
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# ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
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# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
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# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
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# PERFORMANCE OF THIS SOFTWARE.
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#
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####
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#
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# Id: Cookie.py,v 2.29 2000/08/23 05:28:49 timo Exp
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# by Timothy O'Malley <timo@alum.mit.edu>
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#
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# Cookie.py is a Python module for the handling of HTTP
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# cookies as a Python dictionary. See RFC 2109 for more
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# information on cookies.
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#
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# The original idea to treat Cookies as a dictionary came from
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# Dave Mitchell (davem@magnet.com) in 1995, when he released the
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# first version of nscookie.py.
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#
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####
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r"""
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Here's a sample session to show how to use this module.
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At the moment, this is the only documentation.
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The Basics
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----------
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Importing is easy...
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>>> from http import cookies
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Most of the time you start by creating a cookie.
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>>> C = cookies.SimpleCookie()
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Once you've created your Cookie, you can add values just as if it were
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a dictionary.
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>>> C = cookies.SimpleCookie()
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>>> C["fig"] = "newton"
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>>> C["sugar"] = "wafer"
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>>> C.output()
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'Set-Cookie: fig=newton\r\nSet-Cookie: sugar=wafer'
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Notice that the printable representation of a Cookie is the
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appropriate format for a Set-Cookie: header. This is the
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default behavior. You can change the header and printed
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attributes by using the .output() function
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>>> C = cookies.SimpleCookie()
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>>> C["rocky"] = "road"
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>>> C["rocky"]["path"] = "/cookie"
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>>> print(C.output(header="Cookie:"))
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Cookie: rocky=road; Path=/cookie
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>>> print(C.output(attrs=[], header="Cookie:"))
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Cookie: rocky=road
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The load() method of a Cookie extracts cookies from a string. In a
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CGI script, you would use this method to extract the cookies from the
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HTTP_COOKIE environment variable.
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>>> C = cookies.SimpleCookie()
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>>> C.load("chips=ahoy; vienna=finger")
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>>> C.output()
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'Set-Cookie: chips=ahoy\r\nSet-Cookie: vienna=finger'
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The load() method is darn-tootin smart about identifying cookies
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within a string. Escaped quotation marks, nested semicolons, and other
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such trickeries do not confuse it.
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>>> C = cookies.SimpleCookie()
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>>> C.load('keebler="E=everybody; L=\\"Loves\\"; fudge=\\012;";')
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>>> print(C)
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Set-Cookie: keebler="E=everybody; L=\"Loves\"; fudge=\012;"
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Each element of the Cookie also supports all of the RFC 2109
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Cookie attributes. Here's an example which sets the Path
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attribute.
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>>> C = cookies.SimpleCookie()
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>>> C["oreo"] = "doublestuff"
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>>> C["oreo"]["path"] = "/"
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>>> print(C)
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Set-Cookie: oreo=doublestuff; Path=/
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Each dictionary element has a 'value' attribute, which gives you
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back the value associated with the key.
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>>> C = cookies.SimpleCookie()
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>>> C["twix"] = "none for you"
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>>> C["twix"].value
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'none for you'
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The SimpleCookie expects that all values should be standard strings.
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Just to be sure, SimpleCookie invokes the str() builtin to convert
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the value to a string, when the values are set dictionary-style.
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>>> C = cookies.SimpleCookie()
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>>> C["number"] = 7
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>>> C["string"] = "seven"
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>>> C["number"].value
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'7'
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>>> C["string"].value
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'seven'
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>>> C.output()
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'Set-Cookie: number=7\r\nSet-Cookie: string=seven'
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Finis.
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"""
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#
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# Import our required modules
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#
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import re
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import string
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__all__ = ["CookieError", "BaseCookie", "SimpleCookie"]
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_nulljoin = ''.join
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_semispacejoin = '; '.join
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_spacejoin = ' '.join
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#
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# Define an exception visible to External modules
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#
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class CookieError(Exception):
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pass
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# These quoting routines conform to the RFC2109 specification, which in
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# turn references the character definitions from RFC2068. They provide
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# a two-way quoting algorithm. Any non-text character is translated
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# into a 4 character sequence: a forward-slash followed by the
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# three-digit octal equivalent of the character. Any '\' or '"' is
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# quoted with a preceeding '\' slash.
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#
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# These are taken from RFC2068 and RFC2109.
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# _LegalChars is the list of chars which don't require "'s
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# _Translator hash-table for fast quoting
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#
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_LegalChars = string.ascii_letters + string.digits + "!#$%&'*+-.^_`|~:"
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_Translator = {
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'\000' : '\\000', '\001' : '\\001', '\002' : '\\002',
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'\003' : '\\003', '\004' : '\\004', '\005' : '\\005',
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'\006' : '\\006', '\007' : '\\007', '\010' : '\\010',
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'\011' : '\\011', '\012' : '\\012', '\013' : '\\013',
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'\014' : '\\014', '\015' : '\\015', '\016' : '\\016',
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'\017' : '\\017', '\020' : '\\020', '\021' : '\\021',
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'\022' : '\\022', '\023' : '\\023', '\024' : '\\024',
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'\025' : '\\025', '\026' : '\\026', '\027' : '\\027',
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'\030' : '\\030', '\031' : '\\031', '\032' : '\\032',
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'\033' : '\\033', '\034' : '\\034', '\035' : '\\035',
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'\036' : '\\036', '\037' : '\\037',
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# Because of the way browsers really handle cookies (as opposed
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# to what the RFC says) we also encode , and ;
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',' : '\\054', ';' : '\\073',
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'"' : '\\"', '\\' : '\\\\',
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'\177' : '\\177', '\200' : '\\200', '\201' : '\\201',
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'\202' : '\\202', '\203' : '\\203', '\204' : '\\204',
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'\205' : '\\205', '\206' : '\\206', '\207' : '\\207',
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'\210' : '\\210', '\211' : '\\211', '\212' : '\\212',
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'\213' : '\\213', '\214' : '\\214', '\215' : '\\215',
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'\216' : '\\216', '\217' : '\\217', '\220' : '\\220',
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'\221' : '\\221', '\222' : '\\222', '\223' : '\\223',
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'\224' : '\\224', '\225' : '\\225', '\226' : '\\226',
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'\227' : '\\227', '\230' : '\\230', '\231' : '\\231',
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'\232' : '\\232', '\233' : '\\233', '\234' : '\\234',
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'\235' : '\\235', '\236' : '\\236', '\237' : '\\237',
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'\240' : '\\240', '\241' : '\\241', '\242' : '\\242',
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'\243' : '\\243', '\244' : '\\244', '\245' : '\\245',
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'\246' : '\\246', '\247' : '\\247', '\250' : '\\250',
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'\251' : '\\251', '\252' : '\\252', '\253' : '\\253',
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'\254' : '\\254', '\255' : '\\255', '\256' : '\\256',
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'\257' : '\\257', '\260' : '\\260', '\261' : '\\261',
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'\262' : '\\262', '\263' : '\\263', '\264' : '\\264',
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'\265' : '\\265', '\266' : '\\266', '\267' : '\\267',
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'\270' : '\\270', '\271' : '\\271', '\272' : '\\272',
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'\273' : '\\273', '\274' : '\\274', '\275' : '\\275',
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'\276' : '\\276', '\277' : '\\277', '\300' : '\\300',
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'\301' : '\\301', '\302' : '\\302', '\303' : '\\303',
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'\304' : '\\304', '\305' : '\\305', '\306' : '\\306',
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'\307' : '\\307', '\310' : '\\310', '\311' : '\\311',
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'\312' : '\\312', '\313' : '\\313', '\314' : '\\314',
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'\315' : '\\315', '\316' : '\\316', '\317' : '\\317',
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'\320' : '\\320', '\321' : '\\321', '\322' : '\\322',
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'\323' : '\\323', '\324' : '\\324', '\325' : '\\325',
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'\326' : '\\326', '\327' : '\\327', '\330' : '\\330',
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'\331' : '\\331', '\332' : '\\332', '\333' : '\\333',
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'\334' : '\\334', '\335' : '\\335', '\336' : '\\336',
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'\337' : '\\337', '\340' : '\\340', '\341' : '\\341',
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'\342' : '\\342', '\343' : '\\343', '\344' : '\\344',
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'\345' : '\\345', '\346' : '\\346', '\347' : '\\347',
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'\350' : '\\350', '\351' : '\\351', '\352' : '\\352',
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'\353' : '\\353', '\354' : '\\354', '\355' : '\\355',
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'\356' : '\\356', '\357' : '\\357', '\360' : '\\360',
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'\361' : '\\361', '\362' : '\\362', '\363' : '\\363',
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'\364' : '\\364', '\365' : '\\365', '\366' : '\\366',
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'\367' : '\\367', '\370' : '\\370', '\371' : '\\371',
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'\372' : '\\372', '\373' : '\\373', '\374' : '\\374',
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'\375' : '\\375', '\376' : '\\376', '\377' : '\\377'
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}
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def _quote(str, LegalChars=_LegalChars):
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r"""Quote a string for use in a cookie header.
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If the string does not need to be double-quoted, then just return the
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string. Otherwise, surround the string in doublequotes and quote
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(with a \) special characters.
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"""
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if all(c in LegalChars for c in str):
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return str
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else:
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return '"' + _nulljoin(_Translator.get(s, s) for s in str) + '"'
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_OctalPatt = re.compile(r"\\[0-3][0-7][0-7]")
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_QuotePatt = re.compile(r"[\\].")
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def _unquote(str):
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# If there aren't any doublequotes,
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# then there can't be any special characters. See RFC 2109.
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if len(str) < 2:
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return str
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if str[0] != '"' or str[-1] != '"':
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return str
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# We have to assume that we must decode this string.
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# Down to work.
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# Remove the "s
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str = str[1:-1]
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# Check for special sequences. Examples:
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# \012 --> \n
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# \" --> "
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#
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i = 0
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n = len(str)
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res = []
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while 0 <= i < n:
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o_match = _OctalPatt.search(str, i)
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q_match = _QuotePatt.search(str, i)
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if not o_match and not q_match: # Neither matched
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res.append(str[i:])
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break
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# else:
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j = k = -1
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if o_match:
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j = o_match.start(0)
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if q_match:
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k = q_match.start(0)
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if q_match and (not o_match or k < j): # QuotePatt matched
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res.append(str[i:k])
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res.append(str[k+1])
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i = k + 2
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else: # OctalPatt matched
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res.append(str[i:j])
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res.append(chr(int(str[j+1:j+4], 8)))
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i = j + 4
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return _nulljoin(res)
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# The _getdate() routine is used to set the expiration time in the cookie's HTTP
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# header. By default, _getdate() returns the current time in the appropriate
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# "expires" format for a Set-Cookie header. The one optional argument is an
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# offset from now, in seconds. For example, an offset of -3600 means "one hour
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# ago". The offset may be a floating point number.
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#
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_weekdayname = ['Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat', 'Sun']
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_monthname = [None,
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'Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun',
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'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec']
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def _getdate(future=0, weekdayname=_weekdayname, monthname=_monthname):
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from time import gmtime, time
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now = time()
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year, month, day, hh, mm, ss, wd, y, z = gmtime(now + future)
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return "%s, %02d %3s %4d %02d:%02d:%02d GMT" % \
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(weekdayname[wd], day, monthname[month], year, hh, mm, ss)
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class Morsel(dict):
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"""A class to hold ONE (key, value) pair.
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In a cookie, each such pair may have several attributes, so this class is
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used to keep the attributes associated with the appropriate key,value pair.
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This class also includes a coded_value attribute, which is used to hold
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the network representation of the value. This is most useful when Python
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objects are pickled for network transit.
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"""
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# RFC 2109 lists these attributes as reserved:
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# path comment domain
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# max-age secure version
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#
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# For historical reasons, these attributes are also reserved:
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# expires
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#
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# This is an extension from Microsoft:
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# httponly
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#
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# This dictionary provides a mapping from the lowercase
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# variant on the left to the appropriate traditional
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# formatting on the right.
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_reserved = {
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"expires" : "expires",
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"path" : "Path",
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"comment" : "Comment",
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"domain" : "Domain",
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"max-age" : "Max-Age",
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"secure" : "secure",
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"httponly" : "httponly",
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"version" : "Version",
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}
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_flags = {'secure', 'httponly'}
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def __init__(self):
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# Set defaults
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self.key = self.value = self.coded_value = None
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# Set default attributes
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for key in self._reserved:
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dict.__setitem__(self, key, "")
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def __setitem__(self, K, V):
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K = K.lower()
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if not K in self._reserved:
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raise CookieError("Invalid Attribute %s" % K)
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dict.__setitem__(self, K, V)
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def isReservedKey(self, K):
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return K.lower() in self._reserved
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def set(self, key, val, coded_val, LegalChars=_LegalChars):
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# First we verify that the key isn't a reserved word
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# Second we make sure it only contains legal characters
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if key.lower() in self._reserved:
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raise CookieError("Attempt to set a reserved key: %s" % key)
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if any(c not in LegalChars for c in key):
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raise CookieError("Illegal key value: %s" % key)
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# It's a good key, so save it.
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self.key = key
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self.value = val
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self.coded_value = coded_val
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def output(self, attrs=None, header="Set-Cookie:"):
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return "%s %s" % (header, self.OutputString(attrs))
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__str__ = output
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def __repr__(self):
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return '<%s: %s=%s>' % (self.__class__.__name__,
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self.key, repr(self.value))
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def js_output(self, attrs=None):
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# Print javascript
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return """
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<script type="text/javascript">
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<!-- begin hiding
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document.cookie = \"%s\";
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// end hiding -->
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</script>
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""" % (self.OutputString(attrs).replace('"', r'\"'))
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def OutputString(self, attrs=None):
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# Build up our result
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#
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result = []
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append = result.append
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# First, the key=value pair
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append("%s=%s" % (self.key, self.coded_value))
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# Now add any defined attributes
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if attrs is None:
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attrs = self._reserved
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items = sorted(self.items())
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for key, value in items:
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if value == "":
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continue
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if key not in attrs:
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continue
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if key == "expires" and isinstance(value, int):
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append("%s=%s" % (self._reserved[key], _getdate(value)))
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elif key == "max-age" and isinstance(value, int):
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append("%s=%d" % (self._reserved[key], value))
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elif key == "secure":
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append(str(self._reserved[key]))
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elif key == "httponly":
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append(str(self._reserved[key]))
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else:
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append("%s=%s" % (self._reserved[key], value))
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# Return the result
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return _semispacejoin(result)
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#
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# Pattern for finding cookie
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#
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# This used to be strict parsing based on the RFC2109 and RFC2068
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# specifications. I have since discovered that MSIE 3.0x doesn't
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# follow the character rules outlined in those specs. As a
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# result, the parsing rules here are less strict.
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#
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_LegalCharsPatt = r"[\w\d!#%&'~_`><@,:/\$\*\+\-\.\^\|\)\(\?\}\{\=]"
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_CookiePattern = re.compile(r"""
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(?x) # This is a verbose pattern
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\s* # Optional whitespace at start of cookie
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(?P<key> # Start of group 'key'
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""" + _LegalCharsPatt + r"""+? # Any word of at least one letter
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) # End of group 'key'
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( # Optional group: there may not be a value.
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\s*=\s* # Equal Sign
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(?P<val> # Start of group 'val'
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"(?:[^\\"]|\\.)*" # Any doublequoted string
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| # or
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\w{3},\s[\w\d\s-]{9,11}\s[\d:]{8}\sGMT # Special case for "expires" attr
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| # or
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""" + _LegalCharsPatt + r"""* # Any word or empty string
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) # End of group 'val'
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)? # End of optional value group
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\s* # Any number of spaces.
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(\s+|;|$) # Ending either at space, semicolon, or EOS.
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""", re.ASCII) # May be removed if safe.
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# At long last, here is the cookie class. Using this class is almost just like
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# using a dictionary. See this module's docstring for example usage.
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#
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class BaseCookie(dict):
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"""A container class for a set of Morsels."""
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def value_decode(self, val):
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"""real_value, coded_value = value_decode(STRING)
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Called prior to setting a cookie's value from the network
|
|
representation. The VALUE is the value read from HTTP
|
|
header.
|
|
Override this function to modify the behavior of cookies.
|
|
"""
|
|
return val, val
|
|
|
|
def value_encode(self, val):
|
|
"""real_value, coded_value = value_encode(VALUE)
|
|
Called prior to setting a cookie's value from the dictionary
|
|
representation. The VALUE is the value being assigned.
|
|
Override this function to modify the behavior of cookies.
|
|
"""
|
|
strval = str(val)
|
|
return strval, strval
|
|
|
|
def __init__(self, input=None):
|
|
if input:
|
|
self.load(input)
|
|
|
|
def __set(self, key, real_value, coded_value):
|
|
"""Private method for setting a cookie's value"""
|
|
M = self.get(key, Morsel())
|
|
M.set(key, real_value, coded_value)
|
|
dict.__setitem__(self, key, M)
|
|
|
|
def __setitem__(self, key, value):
|
|
"""Dictionary style assignment."""
|
|
if isinstance(value, Morsel):
|
|
# allow assignment of constructed Morsels (e.g. for pickling)
|
|
dict.__setitem__(self, key, value)
|
|
else:
|
|
rval, cval = self.value_encode(value)
|
|
self.__set(key, rval, cval)
|
|
|
|
def output(self, attrs=None, header="Set-Cookie:", sep="\015\012"):
|
|
"""Return a string suitable for HTTP."""
|
|
result = []
|
|
items = sorted(self.items())
|
|
for key, value in items:
|
|
result.append(value.output(attrs, header))
|
|
return sep.join(result)
|
|
|
|
__str__ = output
|
|
|
|
def __repr__(self):
|
|
l = []
|
|
items = sorted(self.items())
|
|
for key, value in items:
|
|
l.append('%s=%s' % (key, repr(value.value)))
|
|
return '<%s: %s>' % (self.__class__.__name__, _spacejoin(l))
|
|
|
|
def js_output(self, attrs=None):
|
|
"""Return a string suitable for JavaScript."""
|
|
result = []
|
|
items = sorted(self.items())
|
|
for key, value in items:
|
|
result.append(value.js_output(attrs))
|
|
return _nulljoin(result)
|
|
|
|
def load(self, rawdata):
|
|
"""Load cookies from a string (presumably HTTP_COOKIE) or
|
|
from a dictionary. Loading cookies from a dictionary 'd'
|
|
is equivalent to calling:
|
|
map(Cookie.__setitem__, d.keys(), d.values())
|
|
"""
|
|
if isinstance(rawdata, str):
|
|
self.__parse_string(rawdata)
|
|
else:
|
|
# self.update() wouldn't call our custom __setitem__
|
|
for key, value in rawdata.items():
|
|
self[key] = value
|
|
return
|
|
|
|
def __parse_string(self, str, patt=_CookiePattern):
|
|
i = 0 # Our starting point
|
|
n = len(str) # Length of string
|
|
M = None # current morsel
|
|
|
|
while 0 <= i < n:
|
|
# Start looking for a cookie
|
|
match = patt.match(str, i)
|
|
if not match:
|
|
# No more cookies
|
|
break
|
|
|
|
key, value = match.group("key"), match.group("val")
|
|
i = match.end(0)
|
|
|
|
# Parse the key, value in case it's metainfo
|
|
if key[0] == "$":
|
|
# We ignore attributes which pertain to the cookie
|
|
# mechanism as a whole. See RFC 2109.
|
|
# (Does anyone care?)
|
|
if M:
|
|
M[key[1:]] = value
|
|
elif key.lower() in Morsel._reserved:
|
|
if M:
|
|
if value is None:
|
|
if key.lower() in Morsel._flags:
|
|
M[key] = True
|
|
else:
|
|
M[key] = _unquote(value)
|
|
elif value is not None:
|
|
rval, cval = self.value_decode(value)
|
|
self.__set(key, rval, cval)
|
|
M = self[key]
|
|
|
|
|
|
class SimpleCookie(BaseCookie):
|
|
"""
|
|
SimpleCookie supports strings as cookie values. When setting
|
|
the value using the dictionary assignment notation, SimpleCookie
|
|
calls the builtin str() to convert the value to a string. Values
|
|
received from HTTP are kept as strings.
|
|
"""
|
|
def value_decode(self, val):
|
|
return _unquote(val), val
|
|
|
|
def value_encode(self, val):
|
|
strval = str(val)
|
|
return strval, _quote(strval)
|