001/*
002 * (C) Copyright 2015 Nuxeo SA (http://nuxeo.com/) and others.
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 *     http://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 *
016 * Contributors:
017 *     Fran├žois Maturel
018 */
019
020package org.nuxeo.ecm.platform.ui.web.keycloak;
021
022import java.io.IOException;
023import java.io.InputStream;
024import java.lang.reflect.Constructor;
025
026import com.fasterxml.jackson.databind.ObjectMapper;
027
028import org.apache.commons.lang3.reflect.MethodUtils;
029import org.keycloak.adapters.KeycloakDeployment;
030import org.keycloak.adapters.KeycloakDeploymentBuilder;
031import org.keycloak.representations.adapters.config.AdapterConfig;
032import org.keycloak.util.SystemPropertiesJsonParserFactory;
033
034/**
035 * This class is developed to overcome a Jackson version problem between Nuxeo and Keycloak.<br>
036 * Nuxeo uses Jackson version 1.8.x where Keycloak uses 1.9.x<br>
037 * Sadly the {@link ObjectMapper#setSerializationInclusion} method is not in 1.8.x<br>
038 * Then {@link KeycloakNuxeoDeployment} is the same class as {@link KeycloakDeploymentBuilder}, rewriting static method
039 * {@link KeycloakDeploymentBuilder#loadAdapterConfig} to avoid the use of
040 * {@link ObjectMapper#setSerializationInclusion}
041 *
042 * @since 7.4
043 */
044public class KeycloakNuxeoDeployment {
045
046    /**
047     * Invokes KeycloakDeploymentBuilder.internalBuild with reflection to avoid rewriting source code
048     *
049     * @param is the configuration file {@link InputStream}
050     * @return the {@link KeycloakDeployment} corresponding to the configuration file
051     */
052    public static KeycloakDeployment build(InputStream is) {
053        AdapterConfig adapterConfig = loadAdapterConfig(is);
054
055        try {
056            Constructor<KeycloakDeploymentBuilder> constructor = KeycloakDeploymentBuilder.class.getDeclaredConstructor();
057            constructor.setAccessible(true);
058            KeycloakDeploymentBuilder builder = constructor.newInstance();
059            return (KeycloakDeployment) MethodUtils.invokeMethod(builder, true, "internalBuild", adapterConfig);
060        } catch (ReflectiveOperationException e) {
061            throw new RuntimeException(e);
062        }
063    }
064
065    public static AdapterConfig loadAdapterConfig(InputStream is) {
066        ObjectMapper mapper = new ObjectMapper(new SystemPropertiesJsonParserFactory());
067        AdapterConfig adapterConfig;
068        try {
069            adapterConfig = mapper.readValue(is, AdapterConfig.class);
070        } catch (IOException e) {
071            throw new RuntimeException(e);
072        }
073        return adapterConfig;
074    }
075
076}