/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.apache.cxf.transport.http;
import java.lang.ref.Reference;
import java.lang.ref.WeakReference;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.net.Authenticator;
import java.net.PasswordAuthentication;
public class ReferencingAuthenticator extends Authenticator {
final Reference<Authenticator> auth;
final Authenticator wrapped;
public ReferencingAuthenticator(Authenticator cxfauth, Authenticator wrapped) {
this.auth = new WeakReference<Authenticator>(cxfauth);
this.wrapped = wrapped;
}
@Override
protected PasswordAuthentication getPasswordAuthentication() {
Authenticator cxfauth = auth.get();
if (cxfauth == null) {
remove();
}
PasswordAuthentication pauth = null;
if (wrapped != null) {
try {
pauth = tryWith(wrapped);
if (pauth != null) {
return pauth;
}
} catch (Exception e) {
pauth = null;
}
}
if (cxfauth != null) {
try {
pauth = tryWith(cxfauth);
} catch (Exception e1) {
pauth = null;
}
}
return pauth;
}
public final void check() {
Authenticator cxfauth = auth.get();
if (cxfauth == null) {
remove();
}
if (wrapped != null && wrapped.getClass().getName().equals(ReferencingAuthenticator.class.getName())) {
try {
Method m = wrapped.getClass().getMethod("check");
m.setAccessible(true);
m.invoke(wrapped);
} catch (Throwable t) {
//ignore
}
}
}
private void remove() {
try {
for (final Field f : Authenticator.class.getDeclaredFields()) {
if (f.getType().equals(Authenticator.class)) {
try {
f.setAccessible(true);
Authenticator o = (Authenticator)f.get(null);
if (o == this) {
//this is at the root of any chain of authenticators
Authenticator.setDefault(wrapped);
} else {
removeFromChain(o);
}
} catch (Exception e) {
//ignore
}
}
}
} catch (Throwable t) {
//ignore
}
}
private void removeFromChain(Authenticator a) {
try {
if (a.getClass().getName().equals(ReferencingAuthenticator.class.getName())) {
//multiple referencing authenticators, we can remove ourself
Field f2 = a.getClass().getDeclaredField("wrapped");
f2.setAccessible(true);
Authenticator a2 = (Authenticator)f2.get(a);
if (a2 == this) {
f2.set(a, wrapped);
} else {
removeFromChain(a2);
}
}
} catch (Throwable t) {
//ignore
}
}
PasswordAuthentication tryWith(Authenticator a) throws Exception {
if (a == null) {
return null;
}
for (final Field f : Authenticator.class.getDeclaredFields()) {
if (!Modifier.isStatic(f.getModifiers())) {
f.setAccessible(true);
Object o = f.get(this);
f.set(a, o);
}
}
final Method m = Authenticator.class.getDeclaredMethod("getPasswordAuthentication");
m.setAccessible(true);
return (PasswordAuthentication)m.invoke(a);
}
}