code: /*
   * Copyright (c) 2019 the Eclipse Milo Authors
   *
   * This program and the accompanying materials are made
   * available under the terms of the Eclipse Public License 2.0
   * which is available at https://www.eclipse.org/legal/epl-2.0/
   *
   * SPDX-License-Identifier: EPL-2.0
   */
  
  package org.eclipse.milo.opcua.sdk.server.identity;
  
  import java.security.cert.X509Certificate;
  import java.util.function.Predicate;
  
  import org.eclipse.milo.opcua.sdk.server.Session;
  import org.jetbrains.annotations.Nullable;
  
  public class X509IdentityValidator extends AbstractX509IdentityValidator {
  
      private final Predicate<X509Certificate> predicate;
  
      public X509IdentityValidator(Predicate<X509Certificate> predicate) {
          this.predicate = predicate;
      }
  
      @Nullable
      @Override
      protected Object authenticateIdentityCertificate(Session session, X509Certificate identityCertificate) {
          if (predicate.test(identityCertificate)) {
              return identityCertificate;
          } else {
              return null;
          }
      }
  
  }
  