/*
    * 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.syncope.wa.starter.pac4j.saml;
  
  import java.util.Base64;
  import net.shibboleth.utilities.java.support.resolver.ResolverException;
  import org.apache.syncope.common.lib.to.SAML2SPEntityTO;
  import org.apache.syncope.common.rest.api.service.SAML2SPEntityService;
  import org.apache.syncope.wa.bootstrap.WARestClient;
  import org.opensaml.saml.metadata.resolver.impl.AbstractReloadingMetadataResolver;
  import org.pac4j.saml.client.SAML2Client;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  public class WASAML2MetadataResolver extends AbstractReloadingMetadataResolver {
  
      protected static final Logger LOG = LoggerFactory.getLogger(WASAML2MetadataResolver.class);
  
      protected final WARestClient waRestClient;
  
      protected final SAML2Client saml2Client;
  
      public WASAML2MetadataResolver(final WARestClient waRestClient, final SAML2Client saml2Client) {
          this.waRestClient = waRestClient;
          this.saml2Client = saml2Client;
      }
  
      @Override
      protected String getMetadataIdentifier() {
          return saml2Client.getName();
      }
  
      @Override
      protected byte[] fetchMetadata() throws ResolverException {
          try {
              SAML2SPEntityTO metadataTO = waRestClient.getService(SAML2SPEntityService.class).get(saml2Client.getName());
              return Base64.getDecoder().decode(metadataTO.getMetadata());
          } catch (Exception e) {
              String message = "Unable to fetch SP metadata for " + saml2Client.getName();
              LOG.error(message, e);
              throw new ResolverException(message);
          }
      }
  }