/*
    * 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.surrogate;
  
  import java.util.Collection;
  import java.util.Optional;
  import java.util.stream.Collectors;
  import org.apache.syncope.common.lib.wa.ImpersonationAccount;
  import org.apache.syncope.common.rest.api.service.wa.ImpersonationService;
  import org.apache.syncope.wa.bootstrap.WARestClient;
  import org.apereo.cas.authentication.principal.Principal;
  import org.apereo.cas.authentication.principal.Service;
  import org.apereo.cas.authentication.surrogate.SurrogateAuthenticationService;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  public class WASurrogateAuthenticationService implements SurrogateAuthenticationService {
  
      protected static final Logger LOG = LoggerFactory.getLogger(WASurrogateAuthenticationService.class);
  
      protected final WARestClient waRestClient;
  
      public WASurrogateAuthenticationService(final WARestClient waRestClient) {
          this.waRestClient = waRestClient;
      }
  
      @Override
      public boolean canImpersonate(final String surrogate, final Principal principal, final Optional<Service> service) {
          try {
              LOG.debug("Checking impersonation attempt by {} for {}", principal, surrogate);
  
              return waRestClient.getService(ImpersonationService.class).read(
                      principal.getId()).stream().anyMatch(acct -> surrogate.equals(acct.getImpersonated()));
          } catch (final Exception e) {
              LOG.info("Could not authorize account {} for owner {}", surrogate, principal.getId());
          }
          return false;
      }
  
      @Override
      public Collection<String> getImpersonationAccounts(final String username) {
          return waRestClient.getService(ImpersonationService.class).read(username).
                  stream().
                  map(ImpersonationAccount::getImpersonated).
                  collect(Collectors.toList());
      }
  }