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https://issues.apache.org/jira/browse/CASSANDRA-15005?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16807101#comment-16807101
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A. Soroka commented on CASSANDRA-15005:
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[~jmeredithco], I finally had a chance to start on this. I've got a branch at
[https://github.com/apache/cassandra/compare/trunk...ajs6f:CASSANDRA-15005-trunk?expand=1]
and it currently is different from yours only a little bit: it is based off
{{trunk}}, I modified your code just a bit to differentiate another error
condition and used the Stream API a little more than did you, I added a simple
unit test and a bit of text for {{doc/source/cql/functions.rst}}.
I hope this is useful-- this is my first attempt to contribute, so please do
correct me when you have time! I look forward to learning.
> 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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