feat(encryption): allow custom loading of JWK sets

[sp00m]

This would allow us to cache the JWK sets to reduce the IOs and improve performances, for instance with something along those lines:

public class CachedHyperwalletEncryption extends HyperwalletEncryption {

    private final Supplier<JWKSet> clientPrivateKeySetSupplier;
    private final Supplier<JWKSet> hyperwalletKeySetSupplier;

    public CachedHyperwalletEncryption(JWEAlgorithm encryptionAlgorithm, JWSAlgorithm signAlgorithm, EncryptionMethod encryptionMethod, String clientPrivateKeySetLocation, String hyperwalletKeySetLocation, Integer jwsExpirationMinutes) {
        super(encryptionAlgorithm, signAlgorithm, encryptionMethod, clientPrivateKeySetLocation, hyperwalletKeySetLocation, jwsExpirationMinutes);
        this.clientPrivateKeySetSupplier = Suppliers.memoize(() -> super.loadClientPrivateKeySet(), CACHE_DURATION);
        this.hyperwalletKeySetSupplier = Suppliers.memoize(() -> super.loadHyperwalletKeySet(), CACHE_DURATION);
    }

    @Override
    protected JWKSet loadClientPrivateKeySet() throws IOException, ParseException {
        return clientPrivateKeySetSupplier.get();
    }

    @Override
    protected JWKSet loadHyperwalletKeySet() throws IOException, ParseException {
        return hyperwalletKeySetSupplier.get();
    }

}

Let me know if you think of a better approach while ensuring backward compatibility, thanks 🙌

[grmeyer-hw-dev]

Hi @sp00m

Thanks for your contribution.
This change will be available on Java V4 SDK v2.4.9