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feilong is a suite of core and expanded libraries that include utility classes, http, excel,cvs, io classes, and much much more.
/*
* Javassist, a Java-bytecode translator toolkit.
* Copyright (C) 1999- Shigeru Chiba. All Rights Reserved.
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. Alternatively, the contents of this file may be used under
* the terms of the GNU Lesser General Public License Version 2.1 or later,
* or the Apache License Version 2.0.
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*/
package com.feilong.lib.javassist.util.proxy;
import java.lang.invoke.MethodHandle;
import java.lang.invoke.MethodHandles;
import java.lang.reflect.AccessibleObject;
import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.security.PrivilegedActionException;
import java.security.PrivilegedExceptionAction;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import com.feilong.lib.javassist.bytecode.ClassFile;
class SecurityActions extends SecurityManager{
public static final SecurityActions stack = new SecurityActions();
/**
* Since Java 9 abruptly removed Reflection.getCallerClass()
* in favour of StackWalker we are left having to find a
* solution for the older versions without upsetting the new compiler.
*
* The member scoped function getClassContext()
* available as a SecurityManager sibling remains
* functional across all versions, for now.
*
* @return represents the declaring class of the method that invoked
* the method that called this or index 2 on the stack trace.
* @since 3.23
*/
public Class getCallerClass(){
return getClassContext()[2];
}
static Method[] getDeclaredMethods(final Class clazz){
if (System.getSecurityManager() == null){
return clazz.getDeclaredMethods();
}else{
return AccessController.doPrivileged((PrivilegedAction) () -> clazz.getDeclaredMethods());
}
}
static Constructor[] getDeclaredConstructors(final Class clazz){
if (System.getSecurityManager() == null){
return clazz.getDeclaredConstructors();
}else{
return AccessController.doPrivileged((PrivilegedAction[]>) () -> clazz.getDeclaredConstructors());
}
}
static MethodHandle getMethodHandle(final Class clazz,final String name,final Class[] params) throws NoSuchMethodException{
try{
return AccessController.doPrivileged((PrivilegedExceptionAction) () -> {
Method rmet = clazz.getDeclaredMethod(name, params);
rmet.setAccessible(true);
MethodHandle meth = MethodHandles.lookup().unreflect(rmet);
rmet.setAccessible(false);
return meth;
});
}catch (PrivilegedActionException e){
if (e.getCause() instanceof NoSuchMethodException){
throw (NoSuchMethodException) e.getCause();
}
throw new RuntimeException(e.getCause());
}
}
static Method getDeclaredMethod(final Class clazz,final String name,final Class[] types) throws NoSuchMethodException{
if (System.getSecurityManager() == null){
return clazz.getDeclaredMethod(name, types);
}else{
try{
return AccessController.doPrivileged((PrivilegedExceptionAction) () -> clazz.getDeclaredMethod(name, types));
}catch (PrivilegedActionException e){
if (e.getCause() instanceof NoSuchMethodException){
throw (NoSuchMethodException) e.getCause();
}
throw new RuntimeException(e.getCause());
}
}
}
static Constructor getDeclaredConstructor(final Class clazz,final Class[] types) throws NoSuchMethodException{
if (System.getSecurityManager() == null){
return clazz.getDeclaredConstructor(types);
}else{
try{
return AccessController.doPrivileged((PrivilegedExceptionAction>) () -> clazz.getDeclaredConstructor(types));
}catch (PrivilegedActionException e){
if (e.getCause() instanceof NoSuchMethodException){
throw (NoSuchMethodException) e.getCause();
}
throw new RuntimeException(e.getCause());
}
}
}
static void setAccessible(final AccessibleObject ao,final boolean accessible){
if (System.getSecurityManager() == null){
ao.setAccessible(accessible);
}else{
AccessController.doPrivileged((PrivilegedAction) () -> {
ao.setAccessible(accessible);
return null;
});
}
}
static void set(final Field fld,final Object target,final Object value) throws IllegalAccessException{
if (System.getSecurityManager() == null){
fld.set(target, value);
}else{
try{
AccessController.doPrivileged((PrivilegedExceptionAction) () -> {
fld.set(target, value);
return null;
});
}catch (PrivilegedActionException e){
if (e.getCause() instanceof NoSuchMethodException){
throw (IllegalAccessException) e.getCause();
}
throw new RuntimeException(e.getCause());
}
}
}
static TheUnsafe getSunMiscUnsafeAnonymously() throws ClassNotFoundException{
try{
return AccessController.doPrivileged((PrivilegedExceptionAction) () -> {
Class unsafe = Class.forName("sun.misc.Unsafe");
Field theUnsafe = unsafe.getDeclaredField("theUnsafe");
theUnsafe.setAccessible(true);
TheUnsafe usf = stack.new TheUnsafe(unsafe, theUnsafe.get(null));
theUnsafe.setAccessible(false);
disableWarning(usf);
return usf;
});
}catch (PrivilegedActionException e){
if (e.getCause() instanceof ClassNotFoundException){
throw (ClassNotFoundException) e.getCause();
}
if (e.getCause() instanceof NoSuchFieldException){
throw new ClassNotFoundException("No such instance.", e.getCause());
}
if (e.getCause() instanceof IllegalAccessException || e.getCause() instanceof IllegalAccessException
|| e.getCause() instanceof SecurityException){
throw new ClassNotFoundException("Security denied access.", e.getCause());
}
throw new RuntimeException(e.getCause());
}
}
/**
* _The_ Notorious sun.misc.Unsafe in all its glory, but anonymous
* so as not to attract unwanted attention. Kept in two separate
* parts it manages to avoid detection from linker/compiler/general
* complainers and those. This functionality will vanish from the
* JDK soon but in the meantime it shouldn't be an obstacle.
*
* All exposed methods are cached in a dictionary with overloaded
* methods collected under their corresponding keys. Currently the
* implementation assumes there is only one, if you need find a
* need there will have to be a compare.
*
* @since 3.23
*/
class TheUnsafe{
final Class unsafe;
final Object theUnsafe;
final Map> methods = new HashMap<>();
TheUnsafe(Class c, Object o){
this.unsafe = c;
this.theUnsafe = o;
for (Method m : unsafe.getDeclaredMethods()){
if (!methods.containsKey(m.getName())){
methods.put(m.getName(), Collections.singletonList(m));
continue;
}
if (methods.get(m.getName()).size() == 1){
methods.put(m.getName(), new ArrayList<>(methods.get(m.getName())));
}
methods.get(m.getName()).add(m);
}
}
private Method getM(String name,Object[] o){
return methods.get(name).get(0);
}
public Object call(String name,Object...args){
try{
return getM(name, args).invoke(theUnsafe, args);
}catch (Throwable t){
t.printStackTrace();
}
return null;
}
}
/**
* Java 9 now complains about every privileged action regardless.
* Displaying warnings of "illegal usage" and then instructing users
* to go hassle the maintainers in order to have it fixed.
* Making it hush for now, see all fixed.
*
* @param tu
* theUnsafe that'll fix it
*/
static void disableWarning(TheUnsafe tu){
try{
if (ClassFile.MAJOR_VERSION < ClassFile.JAVA_9){
return;
}
Class cls = Class.forName("jdk.internal.module.IllegalAccessLogger");
Field logger = cls.getDeclaredField("logger");
tu.call("putObjectVolatile", cls, tu.call("staticFieldOffset", logger), null);
}catch (Exception e){ /* swallow */ }
}
}