AbstractSystemExecution.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.security.core;
  17
  18 import javax.security.auth.Subject;
  19 import javax.security.auth.login.LoginContext;
  20 import javax.security.auth.login.LoginException;
  21
  22 import org.apache.commons.logging.Log;
  23 import org.apache.commons.logging.LogFactory;
  24 import org.argeo.ArgeoException;
  25
  26 /** Provides base method for executing code with system authorization. */
  27 public abstract class AbstractSystemExecution {
  28         private final static Log log = LogFactory
  29                         .getLog(AbstractSystemExecution.class);
  30         private final Subject subject = new Subject();
  31
  32         private final String loginModule = "SYSTEM";
  33
  34         /**
  35          * Authenticate the calling thread to the underlying
  36          * {@link AuthenticationManager}
  37          */
  38         protected void authenticateAsSystem() {
  39                 try {
  40                         LoginContext lc = new LoginContext(loginModule, subject);
  41                         lc.login();
  42                 } catch (LoginException e) {
  43                         throw new ArgeoException("Cannot login as system", e);
  44                 }
  45                 if (log.isTraceEnabled())
  46                         log.trace("System authenticated");
  47         }
  48
  49         protected void deauthenticateAsSystem() {
  50                 try {
  51                         LoginContext lc = new LoginContext(loginModule, subject);
  52                         lc.logout();
  53                 } catch (LoginException e) {
  54                         throw new ArgeoException("Cannot logout as system", e);
  55                 }
  56         }
  57
  58         protected Subject getSubject() {
  59                 return subject;
  60         }
  61 }