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From "Graham Dumpleton (JIRA)" <j...@apache.org>
Subject [jira] Work started: (MODPYTHON-200) Can't use signed and marshalled cookies together.
Date Sun, 29 Oct 2006 21:58:17 GMT
     [ http://issues.apache.org/jira/browse/MODPYTHON-200?page=all ]

Work on MODPYTHON-200 started by Graham Dumpleton.

> Can't use signed and marshalled cookies together.
> -------------------------------------------------
>
>                 Key: MODPYTHON-200
>                 URL: http://issues.apache.org/jira/browse/MODPYTHON-200
>             Project: mod_python
>          Issue Type: Bug
>          Components: core
>    Affects Versions: 3.2.10
>            Reporter: Graham Dumpleton
>         Assigned To: Graham Dumpleton
>             Fix For: 3.3
>
>
> As reported by Clodoaldo Pinto Neto on mailing list:
>   http://www.modpython.org/pipermail/mod_python/2006-October/022427.html
> one cannot use signed and marshalled cookies together.
> For example, with publisher code example:
> from mod_python import Cookie
> def makecookies(req):
>     c = Cookie.MarshalCookie('marshal', 'value', 'secret')
>     d = Cookie.SignedCookie('signed', 'value', 'secret')
>     Cookie.add_cookie(req, c)
>     Cookie.add_cookie(req, d)
>     return 'made\n' + str(req.headers_out)
> def showcookies(req):
>     cookies = Cookie.get_cookies(req, Cookie.MarshalCookie, secret='secret')
>     s = 'There are %s cookies'% len(cookies)
>     for c in cookies.values():
>         s += '\n%s %s' % (str(c), type(c))
>     return 'read\n' + repr(cookies) + '\n' + s + '\n' + str(req.headers_in)
> if one access makecookies and then showcookies, you get:
> Traceback (most recent call last):
>   File "/System/Library/Frameworks/Python.framework/Versions/2.3/lib/python2.3/site-packages/mod_python/importer.py",
line 1519, in HandlerDispatch
>     default=default_handler, arg=req, silent=hlist.silent)
>   File "/System/Library/Frameworks/Python.framework/Versions/2.3/lib/python2.3/site-packages/mod_python/importer.py",
line 1224, in _process_target
>     result = _execute_target(config, req, object, arg)
>   File "/System/Library/Frameworks/Python.framework/Versions/2.3/lib/python2.3/site-packages/mod_python/importer.py",
line 1123, in _execute_target
>     result = object(arg)
>   File "/System/Library/Frameworks/Python.framework/Versions/2.3/lib/python2.3/site-packages/mod_python/publisher.py",
line 213, in handler
>     published = publish_object(req, object)
>   File "/System/Library/Frameworks/Python.framework/Versions/2.3/lib/python2.3/site-packages/mod_python/publisher.py",
line 425, in publish_object
>     return publish_object(req,util.apply_fs_data(object, req.form, req=req))
>   File "/System/Library/Frameworks/Python.framework/Versions/2.3/lib/python2.3/site-packages/mod_python/util.py",
line 546, in apply_fs_data
>     return object(**args)
>   File "/Users/grahamd/public_html/cookies/index.py", line 11, in showcookies
>     cookies = Cookie.get_cookies(req, Cookie.MarshalCookie, secret='secret')
>   File "/System/Library/Frameworks/Python.framework/Versions/2.3/lib/python2.3/site-packages/mod_python/Cookie.py",
line 352, in get_cookies
>     return Class.parse(cookies, **kw)
>   File "/System/Library/Frameworks/Python.framework/Versions/2.3/lib/python2.3/site-packages/mod_python/Cookie.py",
line 254, in parse
>     c.unmarshal(secret)
>   File "/System/Library/Frameworks/Python.framework/Versions/2.3/lib/python2.3/site-packages/mod_python/Cookie.py",
line 282, in unmarshal
>     self.value = marshal.loads(base64.decodestring(self.value))
>   File "/System/Library/Frameworks/Python.framework/Versions/2.3/lib/python2.3/base64.py",
line 44, in decodestring
>     return binascii.a2b_base64(s)
> Error: Incorrect padding
> The problem is that Cookie.get_cookies() makes assumption that all cookies being sent
by browser will be of the same derived type, or are a basic cookie. If mixing derived types
and they are not compatible as far as unpacking goes, the code will fail.
> For starters, there should be a new function called Cookie.get_cookie() where you name
the cookie and it only tries to decode that one cookie. This new method should also be used
in the Session class instead of using Cookie.get_cookies().

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