54 lines
1.8 KiB
Java
54 lines
1.8 KiB
Java
/**
|
|
*
|
|
* Copyright 2019 Florian Schmaus.
|
|
*
|
|
* Licensed 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.jivesoftware.smack.util;
|
|
|
|
import java.lang.reflect.InvocationTargetException;
|
|
import java.security.Provider;
|
|
import java.security.Security;
|
|
|
|
import org.jxmpp.util.cache.LruCache;
|
|
|
|
public class SecurityUtil {
|
|
|
|
private static final LruCache<Class<? extends Provider>, Void> INSERTED_PROVIDERS_CACHE = new LruCache<>(8);
|
|
|
|
public static void ensureProviderAtFirstPosition(Class<? extends Provider> providerClass) {
|
|
if (INSERTED_PROVIDERS_CACHE.containsKey(providerClass)) {
|
|
return;
|
|
}
|
|
|
|
Provider provider;
|
|
try {
|
|
provider = providerClass.getDeclaredConstructor().newInstance();
|
|
} catch (InstantiationException | IllegalAccessException | IllegalArgumentException | InvocationTargetException
|
|
| NoSuchMethodException | SecurityException e) {
|
|
throw new IllegalArgumentException(e);
|
|
}
|
|
|
|
String providerName = provider.getName();
|
|
|
|
int installedPosition ;
|
|
synchronized (Security.class) {
|
|
Security.removeProvider(providerName);
|
|
installedPosition = Security.insertProviderAt(provider, 1);
|
|
}
|
|
assert installedPosition == 1;
|
|
|
|
INSERTED_PROVIDERS_CACHE.put(providerClass, null);
|
|
}
|
|
}
|