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From Angela Schreiber <anch...@adobe.com>
Subject Re: BlobFactory (was Re: svn commit: r1401571 - in /jackrabbit/oak/trunk/oak-core/src/main/java/org/apache/jackrabbit/oak/api: BlobFactory.java Root.java)
Date Wed, 24 Oct 2012 08:24:47 GMT
hi michael

>> + * TODO review again if we really need/want to expose that in the OAK API
> The consequences of not doing so is, that there is no way to create
> blobs through the Oak API which are immediately streamed down to the
> Microkernel.

yes... i know :)
don't get me wrong, i am not opposed to that in general.
but there are some open issues associated with that, which i
would like us to clarify before we finalize the API.

>> + * TODO in particular exposing this interface (and Blob) requires additional thoughts
>> + * TODO - lifecycle of the factory,
>> + * TODO - lifecycle of the Blob,
>> + * TODO - access restrictions and how permissions are enforced on blob creation
>> + * TODO - searchability, versioning and so forth
> All these TODOs also apply to the blobs which get created through the
> ValueFactory in oak-jcr and this was already the case before the
> refactorings of OAK-350.

yes, that's correct... but it doesn't mean that we shouldn't
think about the consequences of having such a feature.

what happens if the adding/changing a binary property fails due
to lack of permissions or due to conflicts or value constraint
violations or some other custom value-validation? i think that we
need the ability to revert the changes made to the binary-store
in such cases...
if we don't have that ability everyone having a Root/ContentSession
at hand (even if it was a read-only session) could dump any kind
of binaries into the repository. that doesn't make sense to me
and looks like a critical security issue... remember o.html? IMO
it's that kind of troubles we are looking for when not having any
means to control who and what is written to the binary store and
not having the ability to revert changes if the overall commit

kind regards

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