/*
    * MIT License
    *
    * Copyright (c) 2010-2020 The Waffle Project Contributors: https://github.com/Waffle/waffle/graphs/contributors
    *
    * Permission is hereby granted, free of charge, to any person obtaining a copy
    * of this software and associated documentation files (the "Software"), to deal
    * in the Software without restriction, including without limitation the rights
    * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
   * copies of the Software, and to permit persons to whom the Software is
   * furnished to do so, subject to the following conditions:
   *
   * The above copyright notice and this permission notice shall be included in all
   * copies or substantial portions of the Software.
   *
   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
   * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
   * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
   * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
   * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
   * SOFTWARE.
   */
  package waffle.servlet;
  
  import jakarta.servlet.Filter;
  import jakarta.servlet.FilterChain;
  import jakarta.servlet.FilterConfig;
  import jakarta.servlet.ServletException;
  import jakarta.servlet.ServletRequest;
  import jakarta.servlet.ServletResponse;
  import jakarta.servlet.http.HttpServletRequest;
  
  import java.io.IOException;
  
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import waffle.util.AuthorizationHeader;
  import waffle.util.CorsPreFlightCheck;
  
  /**
   * The Class CorsAwareNegotiateSecurityFilter.
   */
  public class CorsAwareNegotiateSecurityFilter extends NegotiateSecurityFilter implements Filter {
  
      /** The Constant LOGGER. */
      private static final Logger LOGGER = LoggerFactory.getLogger(CorsAwareNegotiateSecurityFilter.class);
  
      /**
       * Instantiates a new negotiate security filter.
       */
      public CorsAwareNegotiateSecurityFilter() {
          CorsAwareNegotiateSecurityFilter.LOGGER.info("[waffle.servlet.CorsAwareNegotiateSecurityFilter] loaded");
      }
  
      @Override
      public void init(final FilterConfig filterConfig) throws ServletException {
          CorsAwareNegotiateSecurityFilter.LOGGER.info("[waffle.servlet.CorsAwareNegotiateSecurityFilter] Starting");
          super.init(filterConfig);
          CorsAwareNegotiateSecurityFilter.LOGGER.info("[waffle.servlet.CorsAwareNegotiateSecurityFilter] Started");
      }
  
      @Override
      public void doFilter(final ServletRequest request, final ServletResponse response, final FilterChain chain)
              throws IOException, ServletException {
  
          CorsAwareNegotiateSecurityFilter.LOGGER.info("[waffle.servlet.CorsAwareNegotiateSecurityFilter] Filtering");
  
          final HttpServletRequest httpServletRequest = (HttpServletRequest) request;
          final AuthorizationHeader authorizationHeader = new AuthorizationHeader(httpServletRequest);
  
          if (CorsPreFlightCheck.isPreflight(httpServletRequest)) {
              CorsAwareNegotiateSecurityFilter.LOGGER.info(
                      "[waffle.servlet.CorsAwareNegotiateSecurityFilter] Request is CORS preflight; continue filter chain");
              chain.doFilter(request, response);
          } else if (authorizationHeader.isBearerAuthorizationHeader()) {
              CorsAwareNegotiateSecurityFilter.LOGGER
                      .info("[waffle.servlet.CorsAwareNegotiateSecurityFilter] Request is Bearer, continue filter chain");
              chain.doFilter(request, response);
          } else {
              CorsAwareNegotiateSecurityFilter.LOGGER
                      .info("[waffle.servlet.CorsAwareNegotiateSecurityFilter] Request is Not CORS preflight");
  
              super.doFilter(request, response, chain);
  
              CorsAwareNegotiateSecurityFilter.LOGGER
                      .info("[waffle.servlet.CorsAwareNegotiateSecurityFilter] Authentication Completed");
          }
      }
  
      @Override
      public void destroy() {
          super.destroy();
          CorsAwareNegotiateSecurityFilter.LOGGER.info("[waffle.servlet.CorsAwareNegotiateSecurityFilter] unloaded");
      }
  
  }