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From Eduardo Scoz <>
Subject Re: App layer on top of replication
Date Thu, 06 Sep 2012 23:54:10 GMT
Hi Jens,

thanks for the reply.

Is there a list somewhere of all the possible requests that couchdb accepts
(like _changes, _all_docs, etc)? Blocking all requests by default and
making only the few things I would like to have available could be a

A lot of data gets shared between the users in my case. A good analogy
would be an outlook calendar server, where users can have their private
events, but they can also share events with an limited number of people.
Couch (with filtered replication and validate_doc_update) gets me 99%
there, but it fails on the security aspect, because all users would have
access to all private events as well.

On Thu, Sep 6, 2012 at 6:05 PM, Jens Alfke <> wrote:

> On Sep 6, 2012, at 1:41 PM, Eduardo Scoz <<mailto:
>>> wrote:
> My idea is to put CouchDB behind something like Nginx or NodeJS that would
> intercept direct calls to the database, but still let replication work (as
> described above). all_docs replication would also have to be disabled, I
> guess.
> What makes this tricky is that document contents leak out through other
> API calls besides direct GETs of a doc URL. For instance, you can look at
> all documents by getting the _changes feed or _all_docs, and of course
> querying views. Your proxy layer would have to be aware of these — for
> example it would have to block any requests for _changes unless they
> specified a filter that restricted the results to docs that user can see
> (or maybe it could rewrite the URL to add such a filter?)
> I think this is do-able but it’s the sort of thing where I’d worry that
> someone will come up with some creative use of the API to get around it.
> A proposed solution by the couchbase guys is to have multiple databases,
> one for each user, and then use replication to share the data, but this
> seems unmanageable to me once you get thousands of users syncing docs
> around.
> It depends on your data model. At one extreme, if users’ data is entirely
> private, the user databases will all be independent and there’s no
> overhead. How much data is shared between your users?
> —Jens

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