001/*
002 * (C) Copyright 2018 Nuxeo (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 *     pierre
018 */
019package org.nuxeo.runtime.api.login;
020
021import org.apache.logging.log4j.LogManager;
022import org.apache.logging.log4j.Logger;
023import org.nuxeo.runtime.model.DefaultComponent;
024import org.nuxeo.runtime.model.Descriptor;
025
026/**
027 * LoginAs component.
028 * <p>
029 * It allows to contribute implementation to which login is delegated.
030 *
031 * @since 10.3
032 */
033public class LoginAsComponent extends DefaultComponent {
034
035    private static final Logger log = LogManager.getLogger(LoginAsComponent.class);
036
037    private static final String XP_IMPL = "implementation";
038
039    @SuppressWarnings("unchecked")
040    @Override
041    public <T> T getAdapter(Class<T> adapter) {
042        if (adapter == LoginAs.class) {
043            return (T) getLoginAs();
044        }
045        return null;
046    }
047
048    protected LoginAs getLoginAs() {
049        LoginAsDescriptor descriptor = getDescriptor(XP_IMPL, Descriptor.UNIQUE_DESCRIPTOR_ID);
050        if (descriptor == null) {
051            return null;
052        }
053        try {
054            return descriptor.klass.getDeclaredConstructor().newInstance();
055        } catch (ReflectiveOperationException e) {
056            log.error("Unable to instantiate LoginAs implementation", e);
057            return null;
058        }
059    }
060
061}