/*
 * Copyright 2017 Graz University of Technology EAAF-Core Components has been developed in a
 * cooperation between EGIZ, A-SIT Plus, A-SIT, and Graz University of Technology.
 *
 * Licensed under the EUPL, Version 1.2 or - as soon they will be approved by the European
 * Commission - subsequent versions of the EUPL (the "Licence"); You may not use this work except in
 * compliance with the Licence. You may obtain a copy of the Licence at:
 * https://joinup.ec.europa.eu/news/understanding-eupl-v12
 *
 * Unless required by applicable law or agreed to in writing, software distributed under the Licence
 * is distributed on an "AS IS" basis, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
 * or implied. See the Licence for the specific language governing permissions and limitations under
 * the Licence.
 *
 * This product combines work with different licenses. See the "NOTICE" text file for details on the
 * various modules and licenses. The "NOTICE" text file is part of the distribution. Any derivative
 * works that you distribute must include a readable copy of the "NOTICE" text file.
*/

package at.gv.egiz.eaaf.modules.pvp2.impl.validation;

import java.util.ArrayList;
import java.util.List;
import org.opensaml.saml2.metadata.provider.MetadataProvider;
import org.opensaml.security.MetadataCredentialResolver;
import org.opensaml.xml.security.keyinfo.BasicProviderKeyInfoCredentialResolver;
import org.opensaml.xml.security.keyinfo.KeyInfoCredentialResolver;
import org.opensaml.xml.security.keyinfo.KeyInfoProvider;
import org.opensaml.xml.security.keyinfo.provider.DSAKeyValueProvider;
import org.opensaml.xml.security.keyinfo.provider.InlineX509DataProvider;
import org.opensaml.xml.security.keyinfo.provider.RSAKeyValueProvider;
import org.opensaml.xml.signature.SignatureTrustEngine;
import org.opensaml.xml.signature.impl.ExplicitKeySignatureTrustEngine;

public class TrustEngineFactory {

  /**
   * Get OpenSAML2 TrustEngine.
   *
   * @param provider Metadata provider
   * @return
   */
  public static SignatureTrustEngine getSignatureKnownKeysTrustEngine(
      final MetadataProvider provider) {
    MetadataCredentialResolver resolver;

    resolver = new MetadataCredentialResolver(provider);

    final List<KeyInfoProvider> keyInfoProvider = new ArrayList<>();
    keyInfoProvider.add(new DSAKeyValueProvider());
    keyInfoProvider.add(new RSAKeyValueProvider());
    keyInfoProvider.add(new InlineX509DataProvider());

    final KeyInfoCredentialResolver keyInfoResolver =
        new BasicProviderKeyInfoCredentialResolver(keyInfoProvider);

    final ExplicitKeySignatureTrustEngine engine =
        new ExplicitKeySignatureTrustEngine(resolver, keyInfoResolver);

    return engine;

  }

}