Hi,
it turns out the layer group security proposal at
https://github.com/geoserver/geoserver/wiki/GSIP-152
improves the situation vs layer group security, it still fails to address
some use cases.
The use case in particular would be to have certain layers that are only
accessible via an
opaque layer group, but not by themselves, for certain users (fixed basemap
approach)
while for other users they are actually available via other other layer
groups exposing them.
I've been thinking about it and the simplest approach I can think to also
match this requirement
is to introduce a new type of layer group that would be an opaque
container... it would be useful
both in non secured environments, and paired with security:
- When used without security, it would implicitly make the layers
contained in it non advertised, as they would not appear anymore in the
capabilities document (unlike the existing SINGLE mode, which acts as an
alias but still leaves layers visible top level in the caps document). This
is a common situation that we missed a handy setup for (right now one has
to go and make each and every layer non advertised by hand). Mind, this
does not replace "non advertised", there are other legit uses of it, like a
top level layer that is the result of a computation and might be available
only temporarily.
- When used with security, it would allow expansion of the layer from
the group in GetMap, but not allow access to the layer directly
In order to implement the latter the ResourceAccessManager interface would
be extended with a method
that takes a layer group and returns the layers the RAM wants to allow
access to, instead of having
SecureCatalogImpl just loop the contained layers one by one in isolation
and authorize them directly.
The new method would of course have a default implementation to make sure
the interface is not broken.
Two questions:
- Is there any objection?
- Should I make a separate GSIP for this?
Cheers
Andrea
--
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