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This artifact provides a single jar that contains all classes required to use remote Jakarta Enterprise Beans and Jakarta Messaging, including all dependencies. It is intended for use by those not using maven, maven users should just import the Jakarta Enterprise Beans and Jakarta Messaging BOM's instead (shaded JAR's cause lots of problems with maven, as it is very easy to inadvertently end up with different versions on classes on the class path).

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/*
 * Copyright 2018 Red Hat, Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.wildfly.security.auth.jaspi;

import static org.wildfly.common.Assert.checkNotNullParam;

import java.util.Map;
import java.util.function.Supplier;

import javax.security.auth.message.config.AuthConfigFactory;
import javax.security.auth.message.config.AuthConfigProvider;
import javax.security.auth.message.config.RegistrationListener;

import org.wildfly.security.auth.server.SecurityDomain;

/**
 * An {@link AuthConfigFactory} implementation that can delegate to a backup AuthConfigFactory if the Elytron factory is unable
 * to return a provider.
 *
 * @author Darran Lofthouse
 */
public class DelegatingAuthConfigFactory extends AuthConfigFactory {

    private final ElytronAuthConfigFactory elytronAuthConfigFactory;
    private final AuthConfigFactory backupAuthConfigFactory;
    private final Supplier delegationAllowed;

    public DelegatingAuthConfigFactory(final ElytronAuthConfigFactory elytronAuthConfigFactory, final AuthConfigFactory backupAuthConfigFactory, final Supplier delegationAllowed) {
        this.elytronAuthConfigFactory = checkNotNullParam("elytronAuthConfigFactory", elytronAuthConfigFactory);
        this.backupAuthConfigFactory = checkNotNullParam("backupAuthConfigFactory", backupAuthConfigFactory);
        this.delegationAllowed = delegationAllowed;

    }

    public DelegatingAuthConfigFactory(final ElytronAuthConfigFactory elytronAuthConfigFactory, final AuthConfigFactory backupAuthConfigFactory) {
        this(elytronAuthConfigFactory, backupAuthConfigFactory, () -> SecurityDomain.getCurrent() == null);
    }

    @Override
    public AuthConfigProvider getConfigProvider(String layer, String appContext, RegistrationListener listener) {
        AuthConfigProvider authConfigProvider = elytronAuthConfigFactory.getConfigProvider(layer, appContext, listener);
        if (authConfigProvider != null || elytronAuthConfigFactory.matchesRegistration(layer, appContext) || !delegationAllowed.get()) {
            return authConfigProvider;
        }

        return backupAuthConfigFactory.getConfigProvider(layer, appContext, listener);
    }

    @Override
    public String[] getRegistrationIDs(AuthConfigProvider provider) {
        String[] elytronRegistrationIds = elytronAuthConfigFactory.getRegistrationIDs(provider);
        String[] backupRegistrationIds = backupAuthConfigFactory.getRegistrationIDs(provider);

        return combine(elytronRegistrationIds, backupRegistrationIds);
    }

    @Override
    public String[] detachListener(RegistrationListener listener, String layer, String appContext) {
        String[] elytronRegistrationIds = elytronAuthConfigFactory.detachListener(listener, layer, appContext);
        String[] backupRegistrationIds = backupAuthConfigFactory.detachListener(listener, layer, appContext);

        return combine(elytronRegistrationIds, backupRegistrationIds);
    }

    @Override
    public RegistrationContext getRegistrationContext(String registrationID) {
        RegistrationContext registrationContext = elytronAuthConfigFactory.getRegistrationContext(registrationID);
        if (registrationContext == null) {
            registrationContext = backupAuthConfigFactory.getRegistrationContext(registrationID);
        }
        return registrationContext;
    }

    @Override
    public void refresh() {
        elytronAuthConfigFactory.refresh();
        backupAuthConfigFactory.refresh();
    }

    @Override
    public String registerConfigProvider(String className, Map properties, String layer, String appContext, String description) {
        return elytronAuthConfigFactory.registerConfigProvider(className, properties, layer, appContext, description);
    }

    @Override
    public String registerConfigProvider(AuthConfigProvider provider, String layer, String appContext, String description) {
        return elytronAuthConfigFactory.registerConfigProvider(provider, layer, appContext, description);
    }

    @Override
    public boolean removeRegistration(String registrationID) {
        return elytronAuthConfigFactory.removeRegistration(registrationID) || backupAuthConfigFactory.removeRegistration(registrationID);
    }

    private static String[] combine(String[] left, String[] right) {
        if (left == null) return right;
        if (right == null) return left;

        String[] result = new String[left.length + right.length];
        if (left.length > 0) {
            System.arraycopy(left, 0, result, 0, left.length);
        }
        if (right.length > 0) {
            System.arraycopy(right, 0, result, left.length, right.length);
        }

        return result;
    }

}