1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
Lib/Cookie.py
####
# Copyright 2000 by Timothy O'Malley <timo@alum.mit.edu>
#
#                All Rights Reserved
#
# Permission to use, copy, modify, and distribute this software
# and its documentation for any purpose and without fee is hereby
# granted, provided that the above copyright notice appear in all
# copies and that both that copyright notice and this permission
# notice appear in supporting documentation, and that the name of
# Timothy O'Malley  not be used in advertising or publicity
# pertaining to distribution of the software without specific, written
# prior permission.
#
# Timothy O'Malley DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS
# SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
# AND FITNESS, IN NO EVENT SHALL Timothy O'Malley BE LIABLE FOR
# ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
# PERFORMANCE OF THIS SOFTWARE.
#
####
#
# Id: Cookie.py,v 2.29 2000/08/23 05:28:49 timo Exp
#   by Timothy O'Malley <timo@alum.mit.edu>
#
#  Cookie.py is a Python module for the handling of HTTP
#  cookies as a Python dictionary.  See RFC 2109 for more
#  information on cookies.
#
#  The original idea to treat Cookies as a dictionary came from
#  Dave Mitchell (davem@magnet.com) in 1995, when he released the
#  first version of nscookie.py.
#
####

r"""
Here's a sample session to show how to use this module.
At the moment, this is the only documentation.

The Basics
----------

Importing is easy..

   >>> import Cookie

Most of the time you start by creating a cookie.  Cookies come in
three flavors, each with slightly different encoding semantics, but
more on that later.

   >>> C = Cookie.SimpleCookie()
   >>> C = Cookie.SerialCookie()
   >>> C = Cookie.SmartCookie()

[Note: Long-time users of Cookie.py will remember using
Cookie.Cookie() to create a Cookie object.  Although deprecated, it
is still supported by the code.  See the Backward Compatibility notes
for more information.]

Once you've created your Cookie, you can add values just as if it were
a dictionary.

   >>> C = Cookie.SmartCookie()
   >>> C["fig"] = "newton"
   >>> C["sugar"] = "wafer"
   >>> C.output()
   'Set-Cookie: fig=newton\r\nSet-Cookie: sugar=wafer'

Notice that the printable representation of a Cookie is the
appropriate format for a Set-Cookie: header.  This is the
default behavior.  You can change the header and printed
attributes by using the .output() function

   >>> C = Cookie.SmartCookie()
   >>> C["rocky"] = "road"
   >>> C["rocky"]["path"] = "/cookie"
   >>> print C.output(header="Cookie:")
   Cookie: rocky=road; Path=/cookie
   >>> print C.output(attrs=[], header="Cookie:")
   Cookie: rocky=road

The load() method of a Cookie extracts cookies from a string.  In a
CGI script, you would use this method to extract the cookies from the
HTTP_COOKIE environment variable.

   >>> C = Cookie.SmartCookie()
   >>> C.load("chips=ahoy; vienna=finger")
   >>> C.output()
   'Set-Cookie: chips=ahoy\r\nSet-Cookie: vienna=finger'

The load() method is darn-tootin smart about identifying cookies
within a string.  Escaped quotation marks, nested semicolons, and other
such trickeries do not confuse it.

   >>> C = Cookie.SmartCookie()
   >>> C.load('keebler="E=everybody; L=\\"Loves\\"; fudge=\\012;";')
   >>> print C
   Set-Cookie: keebler="E=everybody; L=\"Loves\"; fudge=\012;"

Each element of the Cookie also supports all of the RFC 2109
Cookie attributes.  Here's an example which sets the Path
attribute.

   >>> C = Cookie.SmartCookie()
   >>> C["oreo"] = "doublestuff"
   >>> C["oreo"]["path"] = "/"
   >>> print C
   Set-Cookie: oreo=doublestuff; Path=/

Each dictionary element has a 'value' attribute, which gives you
back the value associated with the key.

   >>> C = Cookie.SmartCookie()
   >>> C["twix"] = "none for you"
   >>> C["twix"].value
   'none for you'


A Bit More Advanced
-------------------

As mentioned before, there are three different flavors of Cookie
objects, each with different encoding/decoding semantics.  This
section briefly discusses the differences.

SimpleCookie

The SimpleCookie expects that all values should be standard strings.
Just to be sure, SimpleCookie invokes the str() builtin to convert
the value to a string, when the values are set dictionary-style.

   >>> C = Cookie.SimpleCookie()
   >>> C["number"] = 7
   >>> C["string"] = "seven"
   >>> C["number"].value
   '7'
   >>> C["string"].value
   'seven'
   >>> C.output()
   'Set-Cookie: number=7\r\nSet-Cookie: string=seven'


SerialCookie

The SerialCookie expects that all values should be serialized using
cPickle (or pickle, if cPickle isn't available).  As a result of
serializing, SerialCookie can save almost any Python object to a
value, and recover the exact same object when the cookie has been
returned.  (SerialCookie can yield some strange-looking cookie
values, however.)

   >>> C = Cookie.SerialCookie()
   >>> C["number"] = 7
   >>> C["string"] = "seven"
   >>> C["number"].value
   7
   >>> C["string"].value
   'seven'
   >>> C.output()
   'Set-Cookie: number="I7\\012."\r\nSet-Cookie: string="S\'seven\'\\012p1\\012."'

Be warned, however, if SerialCookie cannot de-serialize a value (because
it isn't a valid pickle'd object), IT WILL RAISE AN EXCEPTION.


SmartCookie

The SmartCookie combines aspects of each of the other two flavors.
When setting a value in a dictionary-fashion, the SmartCookie will
serialize (ala cPickle) the value *if and only if* it isn't a
Python string.  String objects are *not* serialized.  Similarly,
when the load() method parses out values, it attempts to de-serialize
the value.  If it fails, then it fallsback to treating the value
as a string.

   >>> C = Cookie.SmartCookie()
   >>> C["number"] = 7
   >>> C["string"] = "seven"
   >>> C["number"].value
   7
   >>> C["string"].value
   'seven'
   >>> C.output()
   'Set-Cookie: number="I7\\012."\r\nSet-Cookie: string=seven'


Backwards Compatibility
-----------------------

In order to keep compatibilty with earlier versions of Cookie.py,
it is still possible to use Cookie.Cookie() to create a Cookie.  In
fact, this simply returns a SmartCookie.

   >>> C = Cookie.Cookie()
   >>> print C.__class__.__name__
   SmartCookie


Finis.
"""  #"
#     ^
#     |----helps out font-lock

#
# Import our required modules
#
import string

try:
    from cPickle import dumps, loads
except ImportError:
    from pickle import dumps, loads

import re, warnings

__all__ = ["CookieError","BaseCookie","SimpleCookie","SerialCookie",
           "SmartCookie","Cookie"]

_nulljoin = ''.join
_semispacejoin = '; '.join
_spacejoin = ' '.join

#
# Define an exception visible to External modules
#
class CookieError(Exception):
    pass


# These quoting routines conform to the RFC2109 specification, which in
# turn references the character definitions from RFC2068.  They provide
# a two-way quoting algorithm.  Any non-text character is translated
# into a 4 character sequence: a forward-slash followed by the
# three-digit octal equivalent of the character.  Any '\' or '"' is
# quoted with a preceding '\' slash.
#
# These are taken from RFC2068 and RFC2109.
#       _LegalChars       is the list of chars which don't require "'s
#       _Translator       hash-table for fast quoting
#
_LegalChars       = string.ascii_letters + string.digits + "!#$%&'*+-.^_`|~"
_Translator       = {
    '\000' : '\\000',  '\001' : '\\001',  '\002' : '\\002',
    '\003' : '\\003',  '\004' : '\\004',  '\005' : '\\005',
    '\006' : '\\006',  '\007' : '\\007',  '\010' : '\\010',
    '\011' : '\\011',  '\012' : '\\012',  '\013' : '\\013',
    '\014' : '\\014',  '\015' : '\\015',  '\016' : '\\016',
    '\017' : '\\017',  '\020' : '\\020',  '\021' : '\\021',
    '\022' : '\\022',  '\023' : '\\023',  '\024' : '\\024',
    '\025' : '\\025',  '\026' : '\\026',  '\027' : '\\027',
    '\030' : '\\030',  '\031' : '\\031',  '\032' : '\\032',
    '\033' : '\\033',  '\034' : '\\034',  '\035' : '\\035',
    '\036' : '\\036',  '\037' : '\\037',

    # Because of the way browsers really handle cookies (as opposed
    # to what the RFC says) we also encode , and ;

    ',' : '\\054', ';' : '\\073',

    '"' : '\\"',       '\\' : '\\\\',

    '\177' : '\\177',  '\200' : '\\200',  '\201' : '\\201',
    '\202' : '\\202',  '\203' : '\\203',  '\204' : '\\204',
    '\205' : '\\205',  '\206' : '\\206',  '\207' : '\\207',
    '\210' : '\\210',  '\211' : '\\211',  '\212' : '\\212',
    '\213' : '\\213',  '\214' : '\\214',  '\215' : '\\215',
    '\216' : '\\216',  '\217' : '\\217',  '\220' : '\\220',
    '\221' : '\\221',  '\222' : '\\222',  '\223' : '\\223',
    '\224' : '\\224',  '\225' : '\\225',  '\226' : '\\226',
    '\227' : '\\227',  '\230' : '\\230',  '\231' : '\\231',
    '\232' : '\\232',  '\233' : '\\233',  '\234' : '\\234',
    '\235' : '\\235',  '\236' : '\\236',  '\237' : '\\237',
    '\240' : '\\240',  '\241' : '\\241',  '\242' : '\\242',
    '\243' : '\\243',  '\244' : '\\244',  '\245' : '\\245',
    '\246' : '\\246',  '\247' : '\\247',  '\250' : '\\250',
    '\251' : '\\251',  '\252' : '\\252',  '\253' : '\\253',
    '\254' : '\\254',  '\255' : '\\255',  '\256' : '\\256',
    '\257' : '\\257',  '\260' : '\\260',  '\261' : '\\261',
    '\262' : '\\262',  '\263' : '\\263',  '\264' : '\\264',
    '\265' : '\\265',  '\266' : '\\266',  '\267' : '\\267',
    '\270' : '\\270',  '\271' : '\\271',  '\272' : '\\272',
    '\273' : '\\273',  '\274' : '\\274',  '\275' : '\\275',
    '\276' : '\\276',  '\277' : '\\277',  '\300' : '\\300',
    '\301' : '\\301',  '\302' : '\\302',  '\303' : '\\303',
    '\304' : '\\304',  '\305' : '\\305',  '\306' : '\\306',
    '\307' : '\\307',  '\310' : '\\310',  '\311' : '\\311',
    '\312' : '\\312',  '\313' : '\\313',  '\314' : '\\314',
    '\315' : '\\315',  '\316' : '\\316',  '\317' : '\\317',
    '\320' : '\\320',  '\321' : '\\321',  '\322' : '\\322',
    '\323' : '\\323',  '\324' : '\\324',  '\325' : '\\325',
    '\326' : '\\326',  '\327' : '\\327',  '\330' : '\\330',
    '\331' : '\\331',  '\332' : '\\332',  '\333' : '\\333',
    '\334' : '\\334',  '\335' : '\\335',  '\336' : '\\336',
    '\337' : '\\337',  '\340' : '\\340',  '\341' : '\\341',
    '\342' : '\\342',  '\343' : '\\343',  '\344' : '\\344',
    '\345' : '\\345',  '\346' : '\\346',  '\347' : '\\347',
    '\350' : '\\350',  '\351' : '\\351',  '\352' : '\\352',
    '\353' : '\\353',  '\354' : '\\354',  '\355' : '\\355',
    '\356' : '\\356',  '\357' : '\\357',  '\360' : '\\360',
    '\361' : '\\361',  '\362' : '\\362',  '\363' : '\\363',
    '\364' : '\\364',  '\365' : '\\365',  '\366' : '\\366',
    '\367' : '\\367',  '\370' : '\\370',  '\371' : '\\371',
    '\372' : '\\372',  '\373' : '\\373',  '\374' : '\\374',
    '\375' : '\\375',  '\376' : '\\376',  '\377' : '\\377'
    }

_idmap = ''.join(chr(x) for x in xrange(256))

def _quote(str, LegalChars=_LegalChars,
           idmap=_idmap, translate=string.translate):
    #
    # If the string does not need to be double-quoted,
    # then just return the string.  Otherwise, surround
    # the string in doublequotes and precede quote (with a \)
    # special characters.
    #
    if "" == translate(str, idmap, LegalChars):
        return str
    else:
        return '"' + _nulljoin( map(_Translator.get, str, str) ) + '"'
# end _quote


_OctalPatt = re.compile(r"\\[0-3][0-7][0-7]")
_QuotePatt = re.compile(r"[\\].")

def _unquote(str):
    # If there aren't any doublequotes,
    # then there can't be any special characters.  See RFC 2109.
    if  len(str) < 2:
        return str
    if str[0] != '"' or str[-1] != '"':
        return str

    # We have to assume that we must decode this string.
    # Down to work.

    # Remove the "s
    str = str[1:-1]

    # Check for special sequences.  Examples:
    #    \012 --> \n
    #    \"   --> "
    #
    i = 0
    n = len(str)
    res = []
    while 0 <= i < n:
        Omatch = _OctalPatt.search(str, i)
        Qmatch = _QuotePatt.search(str, i)
        if not Omatch and not Qmatch:              # Neither matched
            res.append(str[i:])
            break
        # else:
        j = k = -1
        if Omatch: j = Omatch.start(0)
        if Qmatch: k = Qmatch.start(0)
        if Qmatch and ( not Omatch or k < j ):     # QuotePatt matched
            res.append(str[i:k])
            res.append(str[k+1])
            i = k+2
        else:                                      # OctalPatt matched
            res.append(str[i:j])
            res.append( chr( int(str[j+1:j+4], 8) ) )
            i = j+4
    return _nulljoin(res)
# end _unquote

# The _getdate() routine is used to set the expiration time in
# the cookie's HTTP header.      By default, _getdate() returns the
# current time in the appropriate "expires" format for a
# Set-Cookie header.     The one optional argument is an offset from
# now, in seconds.      For example, an offset of -3600 means "one hour ago".
# The offset may be a floating point number.
#

_weekdayname = ['Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat', 'Sun']

_monthname = [None,
              'Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun',
              'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec']

def _getdate(future=0, weekdayname=_weekdayname, monthname=_monthname):
    from time import gmtime, time
    now = time()
    year, month, day, hh, mm, ss, wd, y, z = gmtime(now + future)
    return "%s, %02d %3s %4d %02d:%02d:%02d GMT" % \
           (weekdayname[wd], day, monthname[month], year, hh, mm, ss)


#
# A class to hold ONE key,value pair.
# In a cookie, each such pair may have several attributes.
#       so this class is used to keep the attributes associated
#       with the appropriate key,value pair.
# This class also includes a coded_value attribute, which
#       is used to hold the network representation of the
#       value.  This is most useful when Python objects are
#       pickled for network transit.
#

class Morsel(dict):
    # RFC 2109 lists these attributes as reserved:
    #   path       comment         domain
    #   max-age    secure      version
    #
    # For historical reasons, these attributes are also reserved:
    #   expires
    #
    # This is an extension from Microsoft:
    #   httponly
    #
    # This dictionary provides a mapping from the lowercase
    # variant on the left to the appropriate traditional
    # formatting on the right.
    _reserved = { "expires" : "expires",
                   "path"        : "Path",
                   "comment" : "Comment",
                   "domain"      : "Domain",
                   "max-age" : "Max-Age",
                   "secure"      : "secure",
                   "httponly"  : "httponly",
                   "version" : "Version",
                   }

    _flags = {'secure', 'httponly'}

    def __init__(self):
        # Set defaults
        self.key = self.value = self.coded_value = None

        # Set default attributes
        for K in self._reserved:
            dict.__setitem__(self, K, "")
    # end __init__

    def __setitem__(self, K, V):
        K = K.lower()
        if not K in self._reserved:
            raise CookieError("Invalid Attribute %s" % K)
        dict.__setitem__(self, K, V)
    # end __setitem__

    def isReservedKey(self, K):
        return K.lower() in self._reserved
    # end isReservedKey

    def set(self, key, val, coded_val,
            LegalChars=_LegalChars,
            idmap=_idmap, translate=string.translate):
        # First we verify that the key isn't a reserved word
        # Second we make sure it only contains legal characters
        if key.lower() in self._reserved:
            raise CookieError("Attempt to set a reserved key: %s" % key)
        if "" != translate(key, idmap, LegalChars):
            raise CookieError("Illegal key value: %s" % key)

        # It's a good key, so save it.
        self.key                 = key
        self.value               = val
        self.coded_value         = coded_val
    # end set

    def output(self, attrs=None, header = "Set-Cookie:"):
        return "%s %s" % ( header, self.OutputString(attrs) )

    __str__ = output

    def __repr__(self):
        return '<%s: %s=%s>' % (self.__class__.__name__,
                                self.key, repr(self.value) )

    def js_output(self, attrs=None):
        # Print javascript
        return """
        <script type="text/javascript">
        <!-- begin hiding
        document.cookie = \"%s\";
        // end hiding -->
        </script>
        """ % ( self.OutputString(attrs).replace('"',r'\"'), )
    # end js_output()

    def OutputString(self, attrs=None):
        # Build up our result
        #
        result = []
        RA = result.append

        # First, the key=value pair
        RA("%s=%s" % (self.key, self.coded_value))

        # Now add any defined attributes
        if attrs is None:
            attrs = self._reserved
        items = self.items()
        items.sort()
        for K,V in items:
            if V == "": continue
            if K not in attrs: continue
            if K == "expires" and type(V) == type(1):
                RA("%s=%s" % (self._reserved[K], _getdate(V)))
            elif K == "max-age" and type(V) == type(1):
                RA("%s=%d" % (self._reserved[K], V))
            elif K == "secure":
                RA(str(self._reserved[K]))
            elif K == "httponly":
                RA(str(self._reserved[K]))
            else:
                RA("%s=%s" % (self._reserved[K], V))

        # Return the result
        return _semispacejoin(result)
    # end OutputString
# end Morsel class



#
# Pattern for finding cookie
#
# This used to be strict parsing based on the RFC2109 and RFC2068
# specifications.  I have since discovered that MSIE 3.0x doesn't
# follow the character rules outlined in those specs.  As a
# result, the parsing rules here are less strict.
#

_LegalKeyChars  = r"\w\d!#%&'~_`><@,:/\$\*\+\-\.\^\|\)\(\?\}\{\="
_LegalValueChars = _LegalKeyChars + r"\[\]"
_CookiePattern = re.compile(
    r"(?x)"                       # This is a Verbose pattern
    r"\s*"                        # Optional whitespace at start of cookie
    r"(?P<key>"                   # Start of group 'key'
    "["+ _LegalKeyChars +"]+?"     # Any word of at least one letter, nongreedy
    r")"                          # End of group 'key'
    r"("                          # Optional group: there may not be a value.
    r"\s*=\s*"                    # Equal Sign
    r"(?P<val>"                   # Start of group 'val'
    r'"(?:[^\\"]|\\.)*"'            # Any doublequoted string
    r"|"                            # or
    r"\w{3},\s[\s\w\d-]{9,11}\s[\d:]{8}\sGMT" # Special case for "expires" attr
    r"|"                            # or
    "["+ _LegalValueChars +"]*"        # Any word or empty string
    r")"                          # End of group 'val'
    r")?"                         # End of optional value group
    r"\s*"                        # Any number of spaces.
    r"(\s+|;|$)"                  # Ending either at space, semicolon, or EOS.
    )


# At long last, here is the cookie class.
#   Using this class is almost just like using a dictionary.
# See this module's docstring for example usage.
#
class BaseCookie(dict):
    # A container class for a set of Morsels
    #

    def value_decode(self, val):
        """real_value, coded_value = value_decode(STRING)
        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
    # end value_encode

    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
    # end value_encode

    def __init__(self, input=None):
        if input: self.load(input)
    # end __init__

    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)
    # end __set

    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)
    # end __setitem__

    def output(self, attrs=None, header="Set-Cookie:", sep="\015\012"):
        """Return a string suitable for HTTP."""
        result = []
        items = self.items()
        items.sort()
        for K,V in items:
            result.append( V.output(attrs, header) )
        return sep.join(result)
    # end output

    __str__ = output

    def __repr__(self):
        L = []
        items = self.items()
        items.sort()
        for K,V in items:
            L.append( '%s=%s' % (K,repr(V.value) ) )
        return '<%s: %s>' % (self.__class__.__name__, _spacejoin(L))

    def js_output(self, attrs=None):
        """Return a string suitable for JavaScript."""
        result = []
        items = self.items()
        items.sort()
        for K,V in items:
            result.append( V.js_output(attrs) )
        return _nulljoin(result)
    # end js_output

    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 type(rawdata) == type(""):
            self.__ParseString(rawdata)
        else:
            # self.update() wouldn't call our custom __setitem__
            for k, v in rawdata.items():
                self[k] = v
        return
    # end load()

    def __ParseString(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: 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 K.lower() in Morsel._reserved:
                if M:
                    if V is None:
                        if K.lower() in Morsel._flags:
                            M[K] = True
                    else:
                        M[K] = _unquote(V)
            elif V is not None:
                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 __init__(self, input=None):
        warnings.warn("SerialCookie class is insecure; do not use it",
                      DeprecationWarning)
        BaseCookie.__init__(self, input)
    # end __init__
    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 __init__(self, input=None):
        warnings.warn("Cookie/SmartCookie class is insecure; do not use it",
                      DeprecationWarning)
        BaseCookie.__init__(self, input)
    # end __init__
    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

#
###########################################################

def _test():
    import doctest, Cookie
    return doctest.testmod(Cookie)

if __name__ == "__main__":
    _test()


#Local Variables:
#tab-width: 4
#end: