Hi,

We will probably soon need to store checksums of file attachments as part of a
customer project. The goal is to be able to quickly find dupes when importing a
bunch of files from a file-system folder to a nuxeo workspace.

I wondered if it would be relevant to add sha (or md5 ?) checksums by default in
nuxeo, either as a Blob new feature or in a dedicated field of the file schema
computed by a core event listener.

Possible usage:

 - search / query for documents by checksum provided that the checksum field is
indexed by the search service;
 - invalidation key for the transform service hypothetical cache;
 - making it easier to do integrity checks on the client side by having some
browser plugin on sign the checksum instead of the complete binary;
 - additional metadata displayed in the UI so that geeks can check the integrity
of their latest Prison Break^W^W^W Wikipedia iso before burning it to a DVD;
...

-- 
Olivier

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