| /* |
| * 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.drill.exec.rpc.user.security; |
| |
| import static org.apache.drill.exec.ExecConstants.USER_AUTHENTICATOR_IMPL; |
| |
| import java.lang.reflect.Constructor; |
| import java.util.Collection; |
| |
| import org.apache.drill.common.config.DrillConfig; |
| import org.apache.drill.common.scanner.persistence.ScanResult; |
| import org.apache.drill.exec.exception.DrillbitStartupException; |
| |
| import com.google.common.base.Strings; |
| |
| /** |
| * Factory class which provides {@link UserAuthenticator} implementation based on the BOOT options. |
| */ |
| public class UserAuthenticatorFactory { |
| private static final org.slf4j.Logger logger = org.slf4j.LoggerFactory.getLogger(UserAuthenticatorFactory.class); |
| |
| /** |
| * Create a {@link UserAuthenticator} implementation based on BOOT settings in |
| * given <i>drillConfig</i>. |
| * |
| * @param config DrillConfig containing BOOT options. |
| * @return Initialized {@link UserAuthenticator} implementation instance. |
| * It is responsibility of the caller to close the authenticator when no longer needed. |
| * |
| * @throws DrillbitStartupException when no implementation found for given BOOT options. |
| */ |
| public static UserAuthenticator createAuthenticator(final DrillConfig config, ScanResult scan) |
| throws DrillbitStartupException { |
| |
| if(!config.hasPath(USER_AUTHENTICATOR_IMPL)) { |
| throw new DrillbitStartupException(String.format("BOOT option '%s' is missing in config.", |
| USER_AUTHENTICATOR_IMPL)); |
| } |
| |
| final String authImplConfigured = config.getString(USER_AUTHENTICATOR_IMPL); |
| |
| if (Strings.isNullOrEmpty(authImplConfigured)) { |
| throw new DrillbitStartupException(String.format("Invalid value '%s' for BOOT option '%s'", authImplConfigured, |
| USER_AUTHENTICATOR_IMPL)); |
| } |
| |
| final Collection<Class<? extends UserAuthenticator>> authImpls = |
| scan.getImplementations(UserAuthenticator.class); |
| logger.debug("Found UserAuthenticator implementations: {}", authImpls); |
| |
| for(Class<? extends UserAuthenticator> clazz : authImpls) { |
| final UserAuthenticatorTemplate template = clazz.getAnnotation(UserAuthenticatorTemplate.class); |
| if (template == null) { |
| logger.warn("{} doesn't have {} annotation. Skipping.", clazz.getCanonicalName(), |
| UserAuthenticatorTemplate.class); |
| continue; |
| } |
| |
| if (Strings.isNullOrEmpty(template.type())) { |
| logger.warn("{} annotation doesn't have valid type field for UserAuthenticator implementation {}. Skipping..", |
| UserAuthenticatorTemplate.class, clazz.getCanonicalName()); |
| continue; |
| } |
| |
| if (template.type().equalsIgnoreCase(authImplConfigured)) { |
| Constructor<?> validConstructor = null; |
| for (Constructor<?> c : clazz.getConstructors()) { |
| if (c.getParameterTypes().length == 0) { |
| validConstructor = c; |
| break; |
| } |
| } |
| |
| if (validConstructor == null) { |
| logger.warn("Skipping UserAuthenticator implementation class '{}' since it doesn't " + |
| "implement a constructor [{}()]", clazz.getCanonicalName(), clazz.getName()); |
| continue; |
| } |
| |
| // Instantiate authenticator and initialize it |
| try { |
| final UserAuthenticator authenticator = clazz.newInstance(); |
| authenticator.setup(config); |
| return authenticator; |
| } catch(IllegalArgumentException | IllegalAccessException | InstantiationException e) { |
| throw new DrillbitStartupException( |
| String.format("Failed to create and initialize the UserAuthenticator class '%s'", |
| clazz.getCanonicalName()), e); |
| } |
| } |
| } |
| |
| String errMsg = String.format("Failed to find the implementation of '%s' for type '%s'", |
| UserAuthenticator.class.getCanonicalName(), authImplConfigured); |
| logger.error(errMsg); |
| throw new DrillbitStartupException(errMsg); |
| } |
| } |