/*
    * 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.myfaces.tobago.facelets;
  
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  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 javax.servlet.annotation.WebFilter;
  import java.io.IOException;
  import java.lang.invoke.MethodHandles;
  import java.nio.charset.StandardCharsets;
  
  @WebFilter(urlPatterns = "/*")
  public class FixCharacterEncodingFilter implements Filter {
  
    private static final Logger LOG = LoggerFactory.getLogger(MethodHandles.lookup().lookupClass());
  
    @Override
    public void init(final FilterConfig filterConfig) throws ServletException {
      if (LOG.isInfoEnabled()) {
        LOG.info("Filter initialized: Setting characterEncoding to UTF-8 to all requests.");
      }
    }
  
    @Override
    public void doFilter(
        final ServletRequest servletRequest, final ServletResponse servletResponse, final FilterChain filterChain)
        throws IOException, ServletException {
      if (servletRequest.getCharacterEncoding() == null) {
        servletRequest.setCharacterEncoding(StandardCharsets.UTF_8.name());
      }
      filterChain.doFilter(servletRequest, servletResponse);
    }
  
    @Override
    public void destroy() {
    }
  }