Support driver models with read paths (e.g. Dropbox or Google Drive)

[kantai]

It would be nice to be able to support some drivers with more complex requirements (i.e., because the storage provider doesn't provide the ability to pre-determine the URL for a file).

These drivers would require that the gaia hub be invoked on the read path -- so if we want to support something like this, we need a "read-path" gaia driver type. For this spec, I'd propose a get endpoint:

GET /read/

Which will return the data (or, in an ideal world, a 301, but I think that these kinds of backends wouldn't typically have CORS headers set).

[kantai]

Work for this is ongoing in https://github.com/blockstack/gaia/tree/feature/read-drivers-support

Will add some content here for the proposed driver model and exposed API.

[markmhendrickson]

@kantai mind providing a quick update here on the work (ongoing or otherwise), and perhaps the proposed driver model and API?

Also, I've added this to the "Expand storage driver support" project but see @jcnelson also added it earlier to "User-selectable Gaia Storage". My sense is that it's not exactly required to support user-selectable storage, is it?

[jcnelson]

This is more closely aligned with "Expand storage driver support."

[kantai]

Yep -- this is more in the "expand storage driver support", which may ultimately play a part in making running a gaia hub more user-friendly.