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Jon Meredith commented on CASSANDRA-15005:
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Apologies for the lack of instructions, I was rushing yesterday.
The custom functions are enabled in the config file under ‘custom_fcts’,
very similar to your list of whitelisted functions.
There’s a couple of examples under test/unit/com/example and the
test/conf/cassandra.conf file has been updated to enable them. The
functions appear in the system keyspace.
You should be able to scan through the files in
https://github.com/jonmeredith/cassandra/tree/CASSANDRA-15005-3.0/src/java/org/apache/cassandra/cql3/functions
for examples of functions and how to serialize/deserialize the byte buffers
for the arguments.
I’m going to be mostly offline until 23rd March, but would be happy to help
when I’m back if you get stuck.
> Configurable whilelist for UDFs
> -------------------------------
>
> Key: CASSANDRA-15005
> URL: https://issues.apache.org/jira/browse/CASSANDRA-15005
> Project: Cassandra
> Issue Type: Improvement
> Components: CQL/Interpreter
> Reporter: A. Soroka
> Priority: Low
>
> I would like to use the UDF system to distribute some simple calculations on
> values. For some use cases, this would require access only to some Java API
> classes that aren't on the (hardcoded) whitelist (e.g.
> {{java.security.MessageDigest}}). In other cases, it would require access to
> a little non-C* library code, pre-distributed to nodes by out-of-band means.
> As I understand the situation now, the whitelist for types UDFs can use is
> hardcoded in java in
> [UDFunction|[https://github.com/apache/cassandra/blob/trunk/src/java/org/apache/cassandra/cql3/functions/UDFunction.java#L99].]
> This ticket, then, is a request for a facility that would allow that list to
> be extended via some kind of deployment-time configuration. I realize that
> serious security concerns immediately arise for this kind of functionality,
> but I hope that by restricting it (only used during startup, no exposing the
> whitelist for introspection, etc.) it could be quite practical.
> I'd like very much to assist with this ticket if it is accepted. (I believe I
> have sufficient Java skill to do that, but no real familiarity with C*'s
> codebase, yet. :) )
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