On Sunday, 2 March 2014 05:58:37 UTC-8, Sam Lai wrote:
>
> It seems like the fix makes it easier for 90% of the uses, but 
> explicitly blocks the other 10% (i.e. uses involving the use of 
> 'reserved' characters as permitted by the RFC). 
>

Yes. I'm bringing this up because it breaks certain OAuth 1 clients against 
Bitbucket.

In some places we redirect to URLs whose path segment contains a ":". Prior 
to us upgrading to 1.6 the response's location header preserved that colon, 
but now it gets escaped, changing the URL 
(e.g. 
https://api.bitbucket.org/2.0/repositories/david/django-storages/pullrequests/51/diff
 
redirecting to 
https://api.bitbucket.org/2.0/repositories/david/django-storages/diff/regadas/django-storages%3A069fd1d01fbf..f153a70ba254)

In OAuth 1, requests are signed, including the request URL, but the 
RFC-5849 does not mandate any pre-processing of the URL. For several OAuth 
clients (including requests-oauthlib and python-oauth2) that means they 
compute the signature over a string that contains "%3A" instead of ":".

On the server however, the request path automatically gets unquoted before 
it hits the middlewares and views. As our OAuth layer is a middleware that 
reconstructs the signature, it ends up computing over ":", yielding a 
different signature than the client, breaking authentication.

This might be addressable by changing these OAuth clients to perform 
unquoting on the path segment, but a better solution would seem to make 
urlresolvers.py:RegexURLResolver respect the reserved characters for path 
segments and not escape what does not need to be escaped.

I'll follow up with a pull request, unless there are string feelings, or 
unwanted consequences of that approach.

Cheers,
Erik



> The relevant django-developers discussion is here - 
>
> https://groups.google.com/forum/#!searchin/django-developers/13260/django-developers/Gofq5y40mYA/v_4yjrBItWkJ
>  
> The final post addresses this issue, but doesn't seem to have been 
> taken into account when the patch was accepted. 
>
> On 2 March 2014 12:28, Erik van Zijst <erik.va...@gmail.com <javascript:>> 
> wrote: 
> > On Sat, Mar 1, 2014 at 2:41 PM, Sam Lai <samue...@gmail.com<javascript:>> 
> wrote: 
> >> The relevant commit and issue - 
> >> 
> >> 
> https://github.com/django/django/commit/31b5275235bac150a54059db0288a19b9e0516c7
>  
> >> https://code.djangoproject.com/ticket/13260 
> > 
> > Yes I saw that, but I'm confused. I thought these characters are 
> > allowed unescaped in path segments. 
> > 
> > 
> >> On 1 March 2014 17:26, Erik van Zijst <erik.va...@gmail.com<javascript:>> 
> wrote: 
> >>> Django's django.core.urlresolvers.reverse() seems to have changed its 
> >>> behavior in 1.6. It now runs the arguments through quote(), without 
> >>> specifying the safe characters for path components. As a result: 
> >>> 
> >>> on 1.4.10: 
> >>> In [2]: reverse('test', args=['foo:bar']) 
> >>> Out[2]: '/foo:bar' 
> >>> 
> >>> but on 1.6.2: 
> >>> In [2]: reverse('test', args=['foo:bar']) 
> >>> Out[2]: '/foo%3Abar' 
> >>> 
> >>> It would seem to me that this is a regression, as ":@-._~!$&'()*+,;=" 
> are 
> >>> all allowed unescaped in path segments AFAIK. 
> >>> 
> >>> Cheers, 
> >>> Erik 
> >>> 
> >>> -- 
> >>> You received this message because you are subscribed to the Google 
> Groups 
> >>> "Django developers" group. 
> >>> To unsubscribe from this group and stop receiving emails from it, send 
> an 
> >>> email to django-develop...@googlegroups.com <javascript:>. 
> >>> To post to this group, send email to 
> >>> django-d...@googlegroups.com<javascript:>. 
>
> >>> Visit this group at http://groups.google.com/group/django-developers. 
> >>> To view this discussion on the web visit 
> >>> 
> https://groups.google.com/d/msgid/django-developers/064ba557-a722-484f-93bf-423048b51b14%40googlegroups.com.
>  
>
> >>> For more options, visit https://groups.google.com/groups/opt_out. 
> >> 
> >> -- 
> >> You received this message because you are subscribed to a topic in the 
> Google Groups "Django developers" group. 
> >> To unsubscribe from this topic, visit 
> https://groups.google.com/d/topic/django-developers/ZLGk7T4mJuw/unsubscribe. 
>
> >> To unsubscribe from this group and all its topics, send an email to 
> django-develop...@googlegroups.com <javascript:>. 
> >> To post to this group, send email to 
> >> django-d...@googlegroups.com<javascript:>. 
>
> >> Visit this group at http://groups.google.com/group/django-developers. 
> >> To view this discussion on the web visit 
> https://groups.google.com/d/msgid/django-developers/CABxbXqXKhcKFPS8ufmYDGmgHU_QjBuFUb%3DaFXk3FROJyzAJw5A%40mail.gmail.com.
>  
>
> >> For more options, visit https://groups.google.com/groups/opt_out. 
> > 
> > -- 
> > You received this message because you are subscribed to the Google 
> Groups "Django developers" group. 
> > To unsubscribe from this group and stop receiving emails from it, send 
> an email to django-develop...@googlegroups.com <javascript:>. 
> > To post to this group, send email to 
> > django-d...@googlegroups.com<javascript:>. 
>
> > Visit this group at http://groups.google.com/group/django-developers. 
> > To view this discussion on the web visit 
> https://groups.google.com/d/msgid/django-developers/CA%2B69USsj%2BuWHJJfw7-Fr8SFq34Xq0TLThR3Bq2t3r66K9oAFrw%40mail.gmail.com.
>  
>
> > For more options, visit https://groups.google.com/groups/opt_out. 
>

-- 
You received this message because you are subscribed to the Google Groups 
"Django developers" group.
To unsubscribe from this group and stop receiving emails from it, send an email 
to django-developers+unsubscr...@googlegroups.com.
To post to this group, send email to django-developers@googlegroups.com.
Visit this group at http://groups.google.com/group/django-developers.
To view this discussion on the web visit 
https://groups.google.com/d/msgid/django-developers/abbe395b-c22f-42c1-97b7-1a55194fbd14%40googlegroups.com.
For more options, visit https://groups.google.com/groups/opt_out.

Reply via email to