com.sun.javafx.reflect.ReflectUtil Maven / Gradle / Ivy
/*
* Copyright (c) 2005, 2018, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* questions.
*/
package com.sun.javafx.reflect;
import java.lang.reflect.Proxy;
public final class ReflectUtil {
private ReflectUtil() {
}
/**
* Checks package access on the given class.
*
* If it is a {@link Proxy#isProxyClass(java.lang.Class)} that implements
* a non-public interface (i.e. may be in a non-restricted package),
* also check the package access on the proxy interfaces.
*/
public static void checkPackageAccess(Class clazz) {
SecurityManager s = System.getSecurityManager();
if (s != null) {
privateCheckPackageAccess(s, clazz);
}
}
/**
* NOTE: should only be called if a SecurityManager is installed
*/
private static void privateCheckPackageAccess(SecurityManager s, Class clazz) {
while (clazz.isArray()) {
clazz = clazz.getComponentType();
}
String pkg = clazz.getPackageName();
if (pkg != null && !pkg.isEmpty()) {
s.checkPackageAccess(pkg);
}
if (isNonPublicProxyClass(clazz)) {
privateCheckProxyPackageAccess(s, clazz);
}
}
/**
* Checks package access on the given classname.
* This method is typically called when the Class instance is not
* available and the caller attempts to load a class on behalf
* the true caller (application).
*/
public static void checkPackageAccess(String name) {
SecurityManager s = System.getSecurityManager();
if (s != null) {
String cname = name.replace('/', '.');
if (cname.startsWith("[")) {
int b = cname.lastIndexOf('[') + 2;
if (b > 1 && b < cname.length()) {
cname = cname.substring(b);
}
}
int i = cname.lastIndexOf('.');
if (i != -1) {
s.checkPackageAccess(cname.substring(0, i));
}
}
}
public static boolean isPackageAccessible(Class clazz) {
try {
checkPackageAccess(clazz);
} catch (SecurityException e) {
return false;
}
return true;
}
/**
* NOTE: should only be called if a SecurityManager is installed
*/
private static void privateCheckProxyPackageAccess(SecurityManager s, Class clazz) {
// check proxy interfaces if the given class is a proxy class
if (Proxy.isProxyClass(clazz)) {
for (Class intf : clazz.getInterfaces()) {
privateCheckPackageAccess(s, intf);
}
}
}
// Note that bytecode instrumentation tools may exclude 'sun.*'
// classes but not generated proxy classes and so keep it in com.sun.*
public static final String PROXY_PACKAGE = "com.sun.proxy";
/**
* Test if the given class is a proxy class that implements
* non-public interface. Such proxy class may be in a non-restricted
* package that bypasses checkPackageAccess.
*/
public static boolean isNonPublicProxyClass(Class cls) {
if (!Proxy.isProxyClass(cls)) {
return false;
}
String pkg = cls.getPackageName();
return pkg == null || !pkg.startsWith(PROXY_PACKAGE);
}
}