1 /*
   2  * Copyright (c) 2015, 2017, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 package jdk.incubator.http;
  27 
  28 import java.security.AccessControlContext;
  29 import java.security.AccessController;
  30 import java.security.PrivilegedAction;
  31 import java.util.Objects;
  32 import java.util.concurrent.Executor;
  33 
  34 /**
  35  * Executes tasks within a given access control context, and by a given executor.
  36  */
  37 class PrivilegedExecutor implements Executor {
  38 
  39     /** The underlying executor. May be provided by the user. */
  40     final Executor executor;
  41     /** The ACC to execute the tasks within. */
  42     final AccessControlContext acc;
  43 
  44     public PrivilegedExecutor(Executor executor, AccessControlContext acc) {
  45         Objects.requireNonNull(executor);
  46         Objects.requireNonNull(acc);
  47         this.executor = executor;
  48         this.acc = acc;
  49     }
  50 
  51     private static class PrivilegedRunnable implements Runnable {
  52         private final Runnable r;
  53         private final AccessControlContext acc;
  54         PrivilegedRunnable(Runnable r, AccessControlContext acc) {
  55             this.r = r;
  56             this.acc = acc;
  57         }
  58         @Override
  59         public void run() {
  60             PrivilegedAction<Void> pa = () -> { r.run(); return null; };
  61             AccessController.doPrivileged(pa, acc);
  62         }
  63     }
  64 
  65     @Override
  66     public void execute(Runnable r) {
  67         executor.execute(new PrivilegedRunnable(r, acc));
  68     }
  69 }