/**
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.apache.openejb.arquillian.tests.securityejb;

import javax.security.auth.callback.CallbackHandler;
import javax.security.auth.message.AuthException;
import javax.security.auth.message.config.AuthConfigProvider;
import javax.security.auth.message.config.ClientAuthConfig;
import javax.security.auth.message.config.ServerAuthConfig;
import javax.security.auth.message.module.ServerAuthModule;
import java.util.Map;

/**
 * @author Arjan Tijms
 */
public class TheAuthConfigProvider implements AuthConfigProvider {
    private static final String CALLBACK_HANDLER_PROPERTY_NAME = "authconfigprovider.client.callbackhandler";

    private Map<String, String> providerProperties;
    private ServerAuthModule serverAuthModule;

    public TheAuthConfigProvider(final ServerAuthModule serverAuthModule) {
        this.serverAuthModule = serverAuthModule;
    }

    @Override
    public ServerAuthConfig getServerAuthConfig(String layer, String appContext, CallbackHandler handler) throws AuthException,
            SecurityException {
        return new TheServerAuthConfig(layer, appContext, handler == null ? createDefaultCallbackHandler() : handler,
                providerProperties, serverAuthModule);
    }

    @Override
    public ClientAuthConfig getClientAuthConfig(String layer, String appContext, CallbackHandler handler) throws AuthException, SecurityException {
        return null;
    }

    @Override
    public void refresh() {
        // no-op
    }

    private CallbackHandler createDefaultCallbackHandler() throws AuthException {
        final String callBackClassName = System.getProperty(CALLBACK_HANDLER_PROPERTY_NAME);
        if (callBackClassName == null) {
            throw new AuthException("No default handler set via system property: " + CALLBACK_HANDLER_PROPERTY_NAME);
        }
        try {
            return (CallbackHandler) Thread.currentThread().getContextClassLoader().loadClass(callBackClassName).newInstance();
        } catch (Exception e) {
            throw new AuthException(e.getMessage());
        }
    }

}
