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   *  Licensed to the Apache Software Foundation (ASF) under one
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   *  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
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   *
   *        http://www.apache.org/licenses/LICENSE-2.0
   *
   *  Unless required by applicable law or agreed to in writing,
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   *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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   */
  package org.apache.causeway.extensions.secman.delegated.shiro.realm;
  
  import java.util.Collection;
  
  import org.apache.shiro.authc.AuthenticationException;
  import org.apache.shiro.authc.AuthenticationInfo;
  import org.apache.shiro.authc.AuthenticationToken;
  import org.apache.shiro.authc.SimpleAuthenticationInfo;
  import org.apache.shiro.authc.pam.AllSuccessfulStrategy;
  import org.apache.shiro.realm.Realm;
  
  public class AuthenticationStrategyForSecMan extends AllSuccessfulStrategy {
  
      /**
       * Reconfigures the SimpleAuthenticationInfo to use an implementation for storing its PrincipalCollections.
       *
       * <p>
       *    The default implementation uses a {@link org.apache.shiro.subject.SimplePrincipalCollection},
       *    however this doesn't play well with the Causeway security module which ends up chaining
       *    together multiple instances of {@link PrincipalForApplicationUser} for each login.
       *    This is probably because of it doing double duty with holding authorization information.
       *    There may be a better design here, but for now the solution I've chosen is to use a different
       *    implementation of {@link org.apache.shiro.subject.PrincipalCollection} that will only ever store
       *    one instance of {@link PrincipalForApplicationUser} as a principal.
       * </p>
       */
      @Override
      public AuthenticationInfo beforeAllAttempts(Collection<? extends Realm> realms, AuthenticationToken token)
              throws AuthenticationException {
  
          var authenticationInfo = (SimpleAuthenticationInfo) super.beforeAllAttempts(realms, token);
          var principalCollection = new PrincipalCollectionWithSinglePrincipalForApplicationUserInAnyRealm();
  
          authenticationInfo.setPrincipals(principalCollection);
          return authenticationInfo;
      }
  
  }
  