CurrentUser.java

   1 /*
   2  * Copyright (C) 2007-2012 Argeo GmbH
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at
   7  *
   8  *         http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16 package org.argeo.cms.auth;
  17
  18 import java.security.AccessController;
  19 import java.security.Principal;
  20 import java.security.acl.Group;
  21 import java.util.HashSet;
  22 import java.util.Set;
  23
  24 import javax.security.auth.Subject;
  25 import javax.security.auth.x500.X500Principal;
  26
  27 import org.argeo.cms.CmsException;
  28 import org.argeo.cms.CmsView;
  29 import org.argeo.cms.util.CmsUtils;
  30 import org.osgi.service.useradmin.Authorization;
  31
  32 /** Static utilities */
  33 public final class CurrentUser {
  34         /**
  35          * @return the authenticated username or null if not authenticated /
  36          *         anonymous
  37          */
  38         public static String getUsername() {
  39                 return getUsername(currentSubject());
  40         }
  41
  42         public static String getDisplayName() {
  43                 return getDisplayName(currentSubject());
  44         }
  45
  46         public static boolean isAnonymous() {
  47                 return isAnonymous(currentSubject());
  48         }
  49
  50         public static boolean isAnonymous(Subject subject) {
  51                 String username = getUsername(subject);
  52                 return username == null
  53                                 || username.equalsIgnoreCase(AuthConstants.ROLE_ANONYMOUS);
  54         }
  55
  56         private static Subject currentSubject() {
  57                 Subject subject = Subject.getSubject(AccessController.getContext());
  58                 if (subject != null)
  59                         return subject;
  60                 if (subject == null) {
  61                         CmsView cmsView = CmsUtils.getCmsView();
  62                         if (cmsView != null)
  63                                 return cmsView.getSubject();
  64                 }
  65                 throw new CmsException("Cannot find related subject");
  66         }
  67
  68         public final static String getUsername(Subject subject) {
  69                 // Subject subject = Subject.getSubject(AccessController.getContext());
  70                 // if (subject == null)
  71                 // return null;
  72                 if (subject.getPrincipals(X500Principal.class).size() != 1)
  73                         return null;
  74                 Principal principal = subject.getPrincipals(X500Principal.class)
  75                                 .iterator().next();
  76                 return principal.getName();
  77
  78         }
  79
  80         public final static String getDisplayName(Subject subject) {
  81                 return getAuthorization(subject).toString();
  82         }
  83
  84         private static Authorization getAuthorization(Subject subject) {
  85                 return subject.getPrivateCredentials(Authorization.class).iterator()
  86                                 .next();
  87         }
  88
  89         public final static Set<String> roles() {
  90                 return roles(currentSubject());
  91         }
  92
  93         public final static Set<String> roles(Subject subject) {
  94                 Set<String> roles = new HashSet<String>();
  95                 X500Principal userPrincipal = subject
  96                                 .getPrincipals(X500Principal.class).iterator().next();
  97                 roles.add(userPrincipal.getName());
  98                 for (Principal group : subject.getPrincipals(Group.class)) {
  99                         roles.add(group.getName());
 100                 }
 101                 return roles;
 102         }
 103
 104         private CurrentUser() {
 105         }
 106 }