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http://jira.nuxeo.org/browse/NXP-897?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=36224#action_36224
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jhon book commented on NXP-897:
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> Devise a pluggable and optional checksum schema field / Blob extension for
> file attachements
> --------------------------------------------------------------------------------------------
>
> Key: NXP-897
> URL: http://jira.nuxeo.org/browse/NXP-897
> Project: Nuxeo Enterprise Platform
> Issue Type: Improvement
> Components: Core, Transforms
> Reporter: Olivier Grisel
> Assignee: Thierry Delprat
> Fix For: 5.2 M2
>
>
> MD5 or SHA1 (or orther?) checksums for would be useful for several use cases:
> - 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 to check file transfer integrity;
> - HTTP entity tag to optimize HTTP caching with support of 304 (Not Modified)
> esp. when the application server is behind a reverse proxy such as Varnish or
> Squid.
> Open questions:
> - which hash function (MD5, SHA1, or pluggable ?)
> - should it be computed by an asynchronous core event listener or directly
> by the core Blob implementation?
> - should the computation be asynchronous or synchronous or have pluggable
> policy? If the checksum is used to garantee referential integrity at any
> time, the hash computation should probably be part of the transaction.
> - should it be indexed by the default search service setup?
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