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Re: ra_serf redirect URL canonicalization fix

From: Branko Čibej <brane_at_apache.org>
Date: Sat, 1 Feb 2020 15:21:43 +0100

On 01.02.2020 14:23, Stefan Sperling wrote:
> On Sat, Feb 01, 2020 at 12:31:16PM +0100, Branko Čibej wrote:
>> On 01.02.2020 12:17, Stefan Sperling wrote:
>>> On Fri, Jan 31, 2020 at 04:12:20AM +0000, Daniel Shahaf wrote:
>>>> So in balance, how about —
>>>>
>>>> - ra_serf should not canonicalize redirection URLs before accessing them.
>>>>
>>>> - After following all redirections (that is, once we get a 2xx response
>>>> or a 5xx response), canonicalize the resultant URL. If it is then
>>>> equal to the input URL, error out with a "Not a repository" error
>>>> [SVN_ERR_RA_SVN_REPOS_NOT_FOUND seems appropriate]; otherwise, return
>>>> SVN_ERR_RA_SESSION_URL_MISMATCH (the error code that svn_ra_open4()
>>>> promises for this situation).
>>>>
>>>> This would fix both of the original bugs, wouldn't it?
>>> This idea won't work without some restructuring because the redirect
>>> retry loop is currently in libsvn_client, not within ra_serf.
>> And for good reason. The RA layer is supposed do be stupid^Wsimple.
>>
>> -- Brane
> Here is a patch I am running tests on now. With this, the RA layer returns
> the redirect URL in both non-canonicalized and canonicalized forms.
> The idea is to allow libsvn_client to cache the non-canonicalized redirect
> URL and detect loops based on it, while using the canonicalized version for
> any other purposes.

This seems like a good fix, given that we can't just return a
non-canonical URL from the RA layer, due to API compatibility constraints.

> I would not propose to backport this. Rather, this patch would go to 1.14 only.

Ack. Note that there's redirect-loop detection in JavaHL, too, separate
from libsvn_client. It should receive the same kind of polishing.

-- Brane
Received on 2020-02-01 15:21:47 CET

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