| /* |
| * 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.knox.gateway.security; |
| |
| import javax.security.auth.Subject; |
| import java.security.AccessController; |
| import java.security.Principal; |
| import java.util.Optional; |
| import java.util.Set; |
| |
| /** |
| * General utility methods for interrogating the standard java Subject |
| */ |
| public class SubjectUtils { |
| public static Subject getCurrentSubject() { |
| return Subject.getSubject( AccessController.getContext() ); |
| } |
| |
| public static String getPrimaryPrincipalName(Subject subject) { |
| String name = null; |
| |
| Set<PrimaryPrincipal> primaryPrincipals = subject.getPrincipals(PrimaryPrincipal.class); |
| if (!primaryPrincipals.isEmpty()) { |
| return ((PrimaryPrincipal)primaryPrincipals.toArray()[0]).getName(); |
| } |
| |
| // LJM TODO: this implementation assumes the first one found. |
| // We should configure through context param based on knowledge |
| // of the authentication provider in use |
| Optional<Principal> principal = subject.getPrincipals().stream().findFirst(); |
| if (principal.isPresent()) { |
| name = principal.get().getName(); |
| } |
| |
| return name; |
| } |
| |
| public static boolean isImpersonating(Subject subject) { |
| return (!subject.getPrincipals(ImpersonatedPrincipal.class).isEmpty()); |
| } |
| |
| public static String getImpersonatedPrincipalName(Subject subject) { |
| String name = null; |
| |
| Set<ImpersonatedPrincipal> impPrincipals = subject.getPrincipals(ImpersonatedPrincipal.class); |
| if (!impPrincipals.isEmpty()) { |
| return ((Principal)impPrincipals.toArray()[0]).getName(); |
| } |
| |
| return name; |
| } |
| |
| public static String getEffectivePrincipalName(Subject subject) { |
| String name = getImpersonatedPrincipalName(subject); |
| if (name == null) { |
| name = getPrimaryPrincipalName(subject); |
| } |
| |
| return name; |
| } |
| |
| public static String getCurrentEffectivePrincipalName() { |
| String name = null; |
| Subject subject = getCurrentSubject(); |
| if( subject != null ) { |
| name = getImpersonatedPrincipalName( subject ); |
| if (name == null) { |
| name = getPrimaryPrincipalName(subject); |
| } |
| } |
| return name; |
| } |
| |
| } |