/*
    * 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.core.spring.security;
  
  import java.io.IOException;
  import javax.servlet.Filter;
  import javax.servlet.FilterChain;
  import javax.servlet.FilterConfig;
  import javax.servlet.ServletException;
  import javax.servlet.ServletRequest;
  import javax.servlet.ServletResponse;
  import org.apache.syncope.common.lib.types.IdRepoEntitlement;
  import org.springframework.security.access.AccessDeniedException;
  import org.springframework.security.core.context.SecurityContextHolder;
  import org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestWrapper;
  
  public class MustChangePasswordFilter implements Filter {
  
      @Override
      public void init(final FilterConfig filterConfig) throws ServletException {
          // not used
      }
  
      @Override
      public void destroy() {
          // not used
      }
  
      @Override
      public void doFilter(final ServletRequest request, final ServletResponse response, final FilterChain chain)
              throws IOException, ServletException {
  
          if (request instanceof SecurityContextHolderAwareRequestWrapper) {
              boolean isMustChangePassword =
                      SecurityContextHolder.getContext().getAuthentication().getAuthorities().stream().anyMatch(
                              authority -> IdRepoEntitlement.MUST_CHANGE_PASSWORD.equals(authority.getAuthority()));
  
              SecurityContextHolderAwareRequestWrapper wrappedRequest =
                      SecurityContextHolderAwareRequestWrapper.class.cast(request);
              if (isMustChangePassword && !"POST".equalsIgnoreCase(wrappedRequest.getMethod())
                      && !"/users/self/changePassword".equals(wrappedRequest.getPathInfo())) {
  
                  throw new AccessDeniedException("Please change your password first");
              }
          }
  
          chain.doFilter(request, response);
      }
  }