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From "Owens, Steve" <Steve.Ow...@disney.com>
Subject Re: Precedent for single-use URLs?
Date Wed, 31 Oct 2012 20:49:50 GMT
Why not use Oauth 2.0 to control access to the resource?  Seems like the
perfect use case fit for such a stratagem.

On 10/31/12 1:35 PM, "Leif Hedstrom" <zwoop@apache.org> wrote:

>On 10/31/12 9:45 AM, John Allspaw wrote:
>> Hey all -
>> Is there anyone doing logic in ATS to support single-use URLs?
>>
>> Example: I have an mp3. I want exactly one person (i.e. client
>> download) to get at it, and no more. If the download doesn't complete,
>> I'm willing to risk that, no more than one download.
>>
>> Has anyone approached this problem within ATS, or always just handled
>> the logic in the origin server? Presumably the object in cache has a
>> reference count associated with it that we can check if >1 than deny?
>
>But this would always be a cache miss then ? Or is the idea that the
>same user can fetch it multiple times ? If it's the former, why not
>always go to origin, and make it non cacheable? If the object is the
>same, but unique URLs for each user, I'd take a slightly different
>approach:
>
>1) Generate cryptographically signed URLs, personalized, such that it's
>only valid from one client IP (or user cookie or whatever).
>
>2) Validate the URL, if not valid for this particular user + URL combo,
>deny the request
>
>3) Extract the "content" portion of the URL, and use that as the cache
>key.
>
>
>The cache doesn't keep any "ref count" on disk (you knew that ;), it
>does have an LRU for the in memory cache. An object that only gets one
>hit, but is cacheable, would get written to disk, but would not be in
>RAM cache.
>
>Cheers,
>
>-- Leif
>


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