SecurityUtil.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);
- }
- }