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.spring;
  
  import java.util.List;
  
  import jakarta.annotation.PostConstruct;
  import jakarta.inject.Inject;
  import jakarta.servlet.Filter;
  
  import org.springframework.beans.factory.annotation.Qualifier;
  import org.springframework.context.annotation.Configuration;
  import org.springframework.context.annotation.Import;
  import org.springframework.security.web.FilterChainProxy;
  import org.springframework.security.web.SecurityFilterChain;
  import org.springframework.security.web.csrf.CsrfFilter;
  
  import org.apache.causeway.core.config.CausewayConfiguration;
  import org.apache.causeway.core.runtimeservices.CausewayModuleCoreRuntimeServices;
  import org.apache.causeway.security.spring.authconverters.AuthenticationConverterOfAuthenticatedPrincipal;
  import org.apache.causeway.security.spring.authconverters.AuthenticationConverterOfStringPrincipal;
  import org.apache.causeway.security.spring.authconverters.AuthenticationConverterOfUserDetailsPrincipal;
  import org.apache.causeway.security.spring.authentication.AuthenticatorSpring;
  import org.apache.causeway.security.spring.webmodule.WebModuleSpringSecurity;
  
  import lombok.extern.log4j.Log4j2;
  
  /**
   * Configuration Bean to support authentication using Spring Security.
   *
   * @since 2.0 {@index}
   */
  @Configuration
  @Import({
          // modules
          CausewayModuleCoreRuntimeServices.class,
  
          // @Component's
          AuthenticationConverterOfAuthenticatedPrincipal.class,
          AuthenticationConverterOfStringPrincipal.class,
          AuthenticationConverterOfUserDetailsPrincipal.class,
  
          // @Service's
          AuthenticatorSpring.class,
          WebModuleSpringSecurity.class,
  
  })
  @Log4j2
  public class CausewayModuleSecuritySpring {
  
      public static final String NAMESPACE = "causeway.security.spring";
  
      @Qualifier("springSecurityFilterChain")
      @Inject private Filter springSecurityFilterChain;
      @Inject private CausewayConfiguration causewayConfiguration;
  
      @PostConstruct
      public void disableCsrf() {
          if(causewayConfiguration.getSecurity().getSpring().isAllowCsrfFilters()) {
              return; // don't interfere
          }
          log.debug("About to disable any CSRF filters.");
          FilterChainProxy filterChainProxy = (FilterChainProxy) springSecurityFilterChain;
          List<SecurityFilterChain> list = filterChainProxy.getFilterChains();
          list.stream()
            .flatMap(chain -> chain.getFilters().stream())
            .filter(filter->filter instanceof CsrfFilter)
            .map(CsrfFilter.class::cast)
            .forEach(this::disable);
      }
  
      private void disable(CsrfFilter csrfFilter) {
          log.info("disabling {}", csrfFilter.getClass().getName());
          // render the csrfFilter ineffective: filter never gets applied as matcher never matches
          csrfFilter.setRequireCsrfProtectionMatcher(request->false);
      }
  
  }
  