On Feb 13, 2014, at 9:59 AM, Alan McKean
<[email protected]<mailto:[email protected]>> wrote:
On another note, I would like an opinion on the decryption/encryption that I am
using. I have a subclass of CBLMode called OTSCBLModel. It overrides
modelForDocument:encrypted: like this:
(Nit: Technically that's not an override, it's a separate method with a
different name.)
+ (CBLModel *) modelForDocument:(CBLDocument *)document
encrypted:(BOOL)encrypted {
...
[document putProperties:dictionary error:&error];
This isn't a safe thing to do. Instantiating a model for a document should not
modify the document or have other side-effects.
What I want is to leave the original in the db encrypted and the in-memory
properties unencrypted.
I don't think you'll be able to manage this without modifying CBLModel. If you
look through its source code you'll see there are three places where
`document.properties` is referenced. Those are places where the decryption
would need to be inserted.
In addition, there is one call to -propertiesToSave in the -justSave: method.
Right after this is where the encryption would need to happen.
Keep in mind that while this will let you access the actual properties via the
CBLModel API, it won't make them available to map functions, so you still won't
be able to do any queries against the encrypted properties.
Is there a way to 'putProperties' in the document that does not update the
document on disk?
No. -putProperties is explicitly to save properties back to the database on
disk. (And even if you could have this in-memory modification, it still
wouldn't be visible to the map function so it still wouldn't work with queries.)
I think the real solution is going to be to hack some hooks into the replicator
so that it can decrypt docs before adding them to the local db and encrypt them
before uploading them. I don't have the bandwidth to do this right now, but I
can offer advice if you want to do it.
--Jens
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