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558 lines
20 KiB
Python
558 lines
20 KiB
Python
##################################################
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# SPYCE - Python-based HTML Scripting
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# Copyright (c) 2002 Rimon Barr.
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#
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# Refer to spyce.py
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# CVS: $Id: Cookie.py 31144 2012-07-15 15:38:56Z buzz $
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##################################################
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# Cookie.py taken from Python 2.2, and modified it to work in Python 1.5 -- RB
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__doc__ = 'Cookie parsing functionality'
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####
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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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import string
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from UserDict import UserDict
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try:
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from cPickle import dumps, loads
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except ImportError:
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from pickle import dumps, loads
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try:
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import re
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except ImportError:
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raise ImportError, "Cookie.py requires 're' from Python 1.5 or later"
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__all__ = ["CookieError","BaseCookie","SimpleCookie","SerialCookie",
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"SmartCookie","Cookie"]
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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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ascii_lowercase = string.join(map(lambda c: chr(ord('a')+c), range(ord('z')-ord('a')+1)),'')
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ascii_uppercase = string.join(map(lambda c: chr(ord('A')+c), range(ord('z')-ord('a')+1)),'')
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_LegalChars = ascii_lowercase + ascii_uppercase + 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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'"' : '\\"', '\\' : '\\\\',
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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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join=string.join, idmap=string._idmap, translate=string.translate):
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#
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# If the string does not need to be double-quoted,
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# then just return the string. Otherwise, surround
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# the string in doublequotes and precede quote (with a \)
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# special characters.
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#
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if "" == translate(str, idmap, LegalChars):
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return str
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else:
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return '"' + join( map(_Translator.get, str, str), "" ) + '"'
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# end _quote
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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, join=string.join, atoi=string.atoi):
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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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Omatch = _OctalPatt.search(str, i)
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Qmatch = _QuotePatt.search(str, i)
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if not Omatch and not Qmatch: # 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 Omatch: j = Omatch.start(0)
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if Qmatch: k = Qmatch.start(0)
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if Qmatch and ( not Omatch 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( atoi(str[j+1:j+4], 8) ) )
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i = j+4
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return join(res, "")
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# end _unquote
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# The _getdate() routine is used to set the expiration time in
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# the cookie's HTTP header. By default, _getdate() returns the
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# current time in the appropriate "expires" format for a
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# Set-Cookie header. The one optional argument is an offset from
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# now, in seconds. For example, an offset of -3600 means "one hour ago".
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# 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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#
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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.
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# so this class is used to keep the attributes associated
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# with the appropriate key,value pair.
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# This class also includes a coded_value attribute, which
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# is used to hold the network representation of the
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# value. This is most useful when Python objects are
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# pickled for network transit.
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#
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class Morsel(UserDict):
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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 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 = { "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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"version" : "Version",
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}
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_reserved_keys = _reserved.keys()
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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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UserDict.__init__(self)
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# Set default attributes
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for K in self._reserved_keys:
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UserDict.__setitem__(self, K, "")
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# end __init__
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def __setitem__(self, K, V):
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K = string.lower(K)
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if not K in self._reserved_keys:
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raise CookieError("Invalid Attribute %s" % K)
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UserDict.__setitem__(self, K, V)
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# end __setitem__
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def isReservedKey(self, K):
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return string.lower(K) in self._reserved_keys
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# end isReservedKey
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def set(self, key, val, coded_val,
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LegalChars=_LegalChars,
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idmap=string._idmap, translate=string.translate ):
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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 string.lower(key) in self._reserved_keys:
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raise CookieError("Attempt to set a reserved key: %s" % key)
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if "" != translate(key, idmap, LegalChars):
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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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# end set
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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 LANGUAGE="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), )
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# end js_output()
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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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RA = result.append
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# First, the key=value pair
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RA("%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_keys
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items = self.items()
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items.sort()
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for K,V in items:
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if V == "": continue
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if K not in attrs: continue
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if K == "expires" and type(V) == type(1):
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RA("%s=%s;" % (self._reserved[K], _getdate(V)))
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elif K == "max-age" and type(V) == type(1):
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RA("%s=%d;" % (self._reserved[K], V))
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elif K == "secure":
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RA("%s;" % self._reserved[K])
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else:
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RA("%s=%s;" % (self._reserved[K], V))
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# Return the result
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return string.join(result, " ")
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# end OutputString
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# end Morsel class
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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(
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r"(?x)" # This is a Verbose pattern
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r"(?P<key>" # Start of group 'key'
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""+ _LegalCharsPatt +"+?" # Any word of at least one letter, nongreedy
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r")" # End of group 'key'
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r"\s*=\s*" # Equal Sign
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r"(?P<val>" # Start of group 'val'
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r'"(?:[^\\"]|\\.)*"' # Any doublequoted string
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r"|" # or
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""+ _LegalCharsPatt +"*" # Any word or empty string
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r")" # End of group 'val'
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r"\s*;?" # Probably ending in a semi-colon
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)
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# At long last, here is the cookie class.
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# Using this class is almost just like using a dictionary.
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# See this module's docstring for example usage.
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#
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class BaseCookie(UserDict):
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# A container class for a set of Morsels
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#
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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
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representation. The VALUE is the value read from HTTP
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header.
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Override this function to modify the behavior of cookies.
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"""
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return val, val
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# end value_encode
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def value_encode(self, val):
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"""real_value, coded_value = value_encode(VALUE)
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Called prior to setting a cookie's value from the dictionary
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representation. The VALUE is the value being assigned.
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Override this function to modify the behavior of cookies.
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"""
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strval = str(val)
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return strval, strval
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# end value_encode
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def __init__(self, input=None):
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UserDict.__init__(self)
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if input: self.load(input)
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# end __init__
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def __set(self, key, real_value, coded_value):
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"""Private method for setting a cookie's value"""
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M = self.get(key, Morsel())
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M.set(key, real_value, coded_value)
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UserDict.__setitem__(self, key, M)
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# end __set
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def __setitem__(self, key, value):
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"""Dictionary style assignment."""
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rval, cval = self.value_encode(value)
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self.__set(key, rval, cval)
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# end __setitem__
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def output(self, attrs=None, header="Set-Cookie:", sep="\n"):
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"""Return a string suitable for HTTP."""
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result = []
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items = self.items()
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items.sort()
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for K,V in items:
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result.append( V.output(attrs, header) )
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return string.join(result, sep)
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# end output
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__str__ = output
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def __repr__(self):
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L = []
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items = self.items()
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items.sort()
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for K,V in items:
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L.append( '%s=%s' % (K,repr(V.value) ) )
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return '<%s: %s>' % (self.__class__.__name__, string.join(L))
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def js_output(self, attrs=None):
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"""Return a string suitable for JavaScript."""
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result = []
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items = self.items()
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items.sort()
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for K,V in items:
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result.append( V.js_output(attrs) )
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return string.join(result, "")
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# end js_output
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def load(self, rawdata):
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"""Load cookies from a string (presumably HTTP_COOKIE) or
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from a dictionary. Loading cookies from a dictionary 'd'
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is equivalent to calling:
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map(Cookie.__setitem__, d.keys(), d.values())
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"""
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if type(rawdata) == type(""):
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self.__ParseString(rawdata)
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else:
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self.update(rawdata)
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return
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# end load()
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def __ParseString(self, str, patt=_CookiePattern):
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i = 0 # Our starting point
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|
n = len(str) # Length of string
|
|
M = None # current morsel
|
|
|
|
while 0 <= i < n:
|
|
# Start looking for a cookie
|
|
match = patt.search(str, i)
|
|
if not match: break # No more cookies
|
|
|
|
K,V = match.group("key"), match.group("val")
|
|
i = match.end(0)
|
|
|
|
# Parse the key, value in case it's metainfo
|
|
if K[0] == "$":
|
|
# We ignore attributes which pertain to the cookie
|
|
# mechanism as a whole. See RFC 2109.
|
|
# (Does anyone care?)
|
|
if M:
|
|
M[ K[1:] ] = V
|
|
elif string.lower(K) in Morsel._reserved_keys:
|
|
if M:
|
|
M[ K ] = _unquote(V)
|
|
else:
|
|
rval, cval = self.value_decode(V)
|
|
self.__set(K, rval, cval)
|
|
M = self[K]
|
|
# end __ParseString
|
|
# end BaseCookie class
|
|
|
|
class SimpleCookie(BaseCookie):
|
|
"""SimpleCookie
|
|
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 )
|
|
# end SimpleCookie
|
|
|
|
class SerialCookie(BaseCookie):
|
|
"""SerialCookie
|
|
SerialCookie supports arbitrary objects as cookie values. All
|
|
values are serialized (using cPickle) before being sent to the
|
|
client. All incoming values are assumed to be valid Pickle
|
|
representations. IF AN INCOMING VALUE IS NOT IN A VALID PICKLE
|
|
FORMAT, THEN AN EXCEPTION WILL BE RAISED.
|
|
|
|
Note: Large cookie values add overhead because they must be
|
|
retransmitted on every HTTP transaction.
|
|
|
|
Note: HTTP has a 2k limit on the size of a cookie. This class
|
|
does not check for this limit, so be careful!!!
|
|
"""
|
|
def value_decode(self, val):
|
|
# This could raise an exception!
|
|
return loads( _unquote(val) ), val
|
|
def value_encode(self, val):
|
|
return val, _quote( dumps(val) )
|
|
# end SerialCookie
|
|
|
|
class SmartCookie(BaseCookie):
|
|
"""SmartCookie
|
|
SmartCookie supports arbitrary objects as cookie values. If the
|
|
object is a string, then it is quoted. If the object is not a
|
|
string, however, then SmartCookie will use cPickle to serialize
|
|
the object into a string representation.
|
|
|
|
Note: Large cookie values add overhead because they must be
|
|
retransmitted on every HTTP transaction.
|
|
|
|
Note: HTTP has a 2k limit on the size of a cookie. This class
|
|
does not check for this limit, so be careful!!!
|
|
"""
|
|
def value_decode(self, val):
|
|
strval = _unquote(val)
|
|
try:
|
|
return loads(strval), val
|
|
except:
|
|
return strval, val
|
|
def value_encode(self, val):
|
|
if type(val) == type(""):
|
|
return val, _quote(val)
|
|
else:
|
|
return val, _quote( dumps(val) )
|
|
# end SmartCookie
|
|
|
|
|
|
###########################################################
|
|
# Backwards Compatibility: Don't break any existing code!
|
|
|
|
# We provide Cookie() as an alias for SmartCookie()
|
|
Cookie = SmartCookie
|
|
|
|
#
|
|
###########################################################
|
|
|
|
#Local Variables:
|
|
#tab-width: 4
|
|
#end:
|