Hi,
in GeoServer land I'm currently tasked with this requirement to make the
WPS processes available to the end user, either statically, because the
admin simply does not want something, or dynamically, based on the
current user rights.
Filtering SPI extensions is kind of a general problem, but we normally don't
see it much because often the SPI implementations are rather coarse
and we have one per jar: think stores, coverage readers.
For those one often simply does not add the jars that are not desired.
However there are others that are much more fine grained and a single
jar carries many: processes are an example, but filter functions or
converters could be considered as well.
Now, why can't I just filter at the application level?
If it was just for WPS I could indeed just have the WPS use a service
to locate the processes and be done with it.
However processes are now become part of filters functions and
rending world via rendering transformations, and there the lookup
cannot simply use some GeoServer specific mechanism unless
I open an extension point to do so.
In particular I would like to disallow heavy processes to be used
as rendering transformations or filter functions, at least give
the administrator some control on what gets used where.
A solution could be to have a pluggable process filter that can filter
and wrap the factories:
interface ProcessFilter {
ProcessFactory filter(ProcessFactory factory);
}
If it returns null the factory is banned, otherwise it is free to wrap
the factory so that certain processes in the factory are disallowed,
or maybe wrapped so that they throw exception under particular
conditions, such as too large inputs.
Opinions?
Cheers
Andrea
--
-------------------------------------------------------
Ing. Andrea Aime
GeoSolutions S.A.S.
Tech lead
Via Poggio alle Viti 1187
55054 Massarosa (LU)
Italy
phone: +39 0584 962313
fax: +39 0584 962313
http://www.geo-solutions.it
http://geo-solutions.blogspot.com/
http://www.youtube.com/user/GeoSolutionsIT
http://www.linkedin.com/in/andreaaime
http://twitter.com/geowolf
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