Modify Keycloak source code without recompiling the whole project #14101

Bredstone · 2022-08-30T18:33:14Z

Bredstone
Aug 30, 2022

Hello! :)

I'm trying to add some post quantum algorithms to Keycloak via custom SPI's and, to do so, I need to modify some core classes (mostly Provider classes) from Keycloak with my code so the system recognizes the new algorithms.

Unfortunately, recompile Keycloak is a toilsome job (that takes a lot of time), therefore modifying core files would make impracticable to run tests and stuff, while developing.

I've been studying Keycloak source files and noticed that the providers I need to modify (apparently) don't implement ProviderFactory interfaces, so (I think) it's not possible to modify these files with a SPI approach.

My questions are: Is it possible to modify such classes without recompiling entire Keycloak? Can I use custom SPI's to fix these problems? Should I try another solution? (I'm kinda out of ideas)

By the way, one of the classes I need to modify is BCPemUtilsProvider and I would like to do something like this:

    @Override
    protected String encode(Object obj) {
        if (obj == null) {
            return null;
        }

        try {
            StringWriter writer = new StringWriter();
            JcaPEMWriter pemWriter = new JcaPEMWriter(writer);

            /** 
             * MY CODE GOES HERE...
             */

            pemWriter.writeObject(obj);
            pemWriter.flush();
            pemWriter.close();
            String s = writer.toString();
            return removeBeginEnd(s);
        } catch (Exception e) {
            throw new PemException(e);
        }
    }

stelewis-redhat · 2022-08-31T18:01:00Z

stelewis-redhat
Aug 31, 2022

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0 replies

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0

What you could do is convert those places where certain "Providers" aren't pluggable into official providers with a lookup. That would take some extra effort, but the Provider API is relatively straightforward, and then you could iterate more quickly in a non-core package, just to prove your ideas out.

Take my suggestion with a grain of salt. I'm not a maintainer, and I have no idea if maintainers would approve of my suggestion, but technically, I don't see why it couldn't be done.

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stelewis-redhat Aug 31, 2022

Bredstone
Aug 30, 2022

stelewis-redhat
Aug 31, 2022