content: /*
   *  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.causeway.security.simple.authentication;
  
  import java.util.stream.Stream;
  
  import jakarta.inject.Inject;
  import jakarta.inject.Named;
  
  import org.springframework.beans.factory.annotation.Qualifier;
  import org.springframework.security.crypto.password.PasswordEncoder;
  import org.springframework.stereotype.Service;
  
  import org.apache.causeway.applib.annotation.PriorityPrecedence;
  import org.apache.causeway.applib.services.iactnlayer.InteractionContext;
  import org.apache.causeway.applib.services.user.UserMemento;
  import org.apache.causeway.commons.internal.base._Strings;
  import org.apache.causeway.core.security.authentication.AuthenticationRequest;
  import org.apache.causeway.core.security.authentication.AuthenticationRequestPassword;
  import org.apache.causeway.core.security.authentication.Authenticator;
  import org.apache.causeway.security.simple.CausewayModuleSecuritySimple;
  import org.apache.causeway.security.simple.realm.SimpleRealm;
  
  import org.jspecify.annotations.NonNull;
  import lombok.RequiredArgsConstructor;
  
  /**
   * Simple in-memory {@link Authenticator} implementation.
   *
   * @since 2.x {@index}
   */
  @Service
  @Named(CausewayModuleSecuritySimple.NAMESPACE + ".SimpleAuthenticator")
  @jakarta.annotation.Priority(PriorityPrecedence.LATE - 10) // ensure earlier than bypass
  @Qualifier("Simple")
  @RequiredArgsConstructor(onConstructor_ = {@Inject})
  public class SimpleAuthenticator implements Authenticator {
  
      protected final SimpleRealm realm;
      protected final PasswordEncoder passwordEncoder;
  
      @Override
      public final boolean canAuthenticate(final Class<? extends AuthenticationRequest> authenticationRequestClass) {
          return AuthenticationRequestPassword.class.isAssignableFrom(authenticationRequestClass);
      }
  
      @Override
      public final InteractionContext authenticate(
              final AuthenticationRequest request,
              final String validationCode) {
  
          if(request instanceof AuthenticationRequestPassword) {
              if (!isValid((AuthenticationRequestPassword) request)) {
                  return null;
              }
          } else {
              return null; // request type not supported
          }
  
          var user = UserMemento.ofNameAndRoleNames(request.getName(), Stream.concat(
                      request.streamRoles(),
                      realm.lookupUserByName(request.getName()).orElseThrow()
                          .roles()
                          .stream()
                          .map(SimpleRealm.Role::name))
                  )
                  .withAuthenticationCode(validationCode);
          return InteractionContext.ofUserWithSystemDefaults(user);
      }
  
      @Override
      public final void logout() {
          // no-op
      }
  
      protected boolean isValid(final @NonNull AuthenticationRequestPassword request) {
          var plainPass = request.getPassword();
          return _Strings.isNullOrEmpty(plainPass)
              ? false
              : realm.lookupUserByName(request.getName())
                  .map(SimpleRealm.User::encryptedPass)
                  .map(encryptedPass->passwordEncoder.matches(request.getPassword(), encryptedPass))
                  .orElse(false);
      }
  
  }
  