1 /*
   2  * Copyright (c) 2015, 2016, 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.net.SocketPermission;
  29 import java.security.AccessControlContext;
  30 import java.security.AccessController;
  31 import java.security.PrivilegedAction;
  32 import java.util.concurrent.Executor;
  33 import jdk.internal.misc.InnocuousThread;
  34 
  35 /**
  36  * Wraps the supplied user Executor
  37  *
  38  * when a Security manager set, the correct access control context is used to execute task
  39  *
  40  * The access control context is captured at creation time of this object
  41  */
  42 class ExecutorWrapper {
  43 
  44     final Executor userExecutor; // the undeerlying executor provided by user
  45     final Executor executor; // the executur which wraps the user's one
  46     final AccessControlContext acc;
  47     final ClassLoader ccl;
  48 
  49     public ExecutorWrapper(Executor userExecutor, AccessControlContext acc) {
  50         this.userExecutor = userExecutor;
  51         this.acc = acc;
  52         this.ccl = getCCL();
  53         if (System.getSecurityManager() == null) {
  54             this.executor = userExecutor;
  55         } else {
  56             this.executor = this::run;
  57         }
  58     }
  59 
  60     private ClassLoader getCCL() {
  61         return AccessController.doPrivileged(
  62             (PrivilegedAction<ClassLoader>) () -> {
  63                 return Thread.currentThread().getContextClassLoader();
  64             }
  65         );
  66     }
  67 
  68     /**
  69      * This is only used for the default HttpClient to deal with
  70      * different application contexts that might be using it.
  71      * The default client uses InnocuousThreads in its Executor.
  72      */
  73     private void prepareThread() {
  74         final Thread me = Thread.currentThread();
  75         if (!(me instanceof InnocuousThread))
  76             return;
  77         InnocuousThread innocuousMe = (InnocuousThread)me;
  78 
  79         AccessController.doPrivileged(
  80             (PrivilegedAction<Void>) () -> {
  81                 innocuousMe.setContextClassLoader(ccl);
  82                 innocuousMe.eraseThreadLocals();
  83                 return null;
  84             }
  85         );
  86     }
  87 
  88 
  89     void run(Runnable r) {
  90         prepareThread();
  91         try {
  92             userExecutor.execute(r); // all throwables must be caught
  93         } catch (Throwable t) {
  94             t.printStackTrace();
  95         }
  96     }
  97 
  98     public Executor userExecutor() {
  99         return userExecutor;
 100     }
 101 
 102     public Executor executor() {
 103         return executor;
 104     }
 105 }