/*
    * 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.webapp;
  
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  import org.apache.myfaces.tobago.internal.webapp.TobagoMultipartFormdataRequest;
  
  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.http.HttpServletRequest;
  import java.io.File;
  import java.io.IOException;
  import java.util.Locale;
  
  
  /**
   * This filter handles multipart request. It must be enabled in the web.xml of your web application.
   * Usage:
   * <p/>
   * <p><blockquote><pre>
   * &lt;filter&gt;
   * &lt;filter-name&gt;multipartFormdataFilter&lt;/filter-name&gt;
   * &lt;filter-class&gt;org.apache.myfaces.tobago.webapp.TobagoMultipartFormdataFilter&lt;/filter-class&gt;
   * &lt;init-param&gt;
   * &lt;description&gt;Set the size limit for uploaded files. Default value is 1 MB.
   * Format: 10 = 10 bytes
   * 10k = 10 KB
   * 10m = 10 MB
   * 1g = 1 GB
   * &lt;/description&gt;
   * &lt;param-name&gt;uploadMaxFileSize&lt;/param-name&gt;
   * &lt;param-value&gt;20m&lt;/param-value&gt;
   * &lt;/init-param&gt;
   * &lt;init-param&gt;
   * &lt;description&gt;Set the upload repository path for uploaded files.
   * Default value is java.io.tmpdir.&lt;/description&gt;
   * &lt;param-name&gt;uploadRepositoryPath&lt;/param-name&gt;
   * &lt;param-value&gt;/tmp&lt;/param-value&gt;
   * &lt;/init-param&gt;
   * &lt;/filter&gt;
   * &lt;filter-mapping&gt;
   * &lt;filter-name&gt;multipartFormdataFilter&lt;/filter-name&gt;
   * &lt;url-pattern&gt;/faces/*&lt;/url-pattern&gt;
   * &lt;/filter-mapping&gt;
   * </pre></blockquote><p>
   */
  public class TobagoMultipartFormdataFilter implements Filter {
  
    private static final Logger LOG = LoggerFactory.getLogger(TobagoMultipartFormdataFilter.class);
  
    private String repositoryPath = System.getProperty("java.io.tmpdir");
    private long maxSize = TobagoMultipartFormdataRequest.ONE_MB;
  
    public void init(FilterConfig filterConfig) throws ServletException {
      String repositoryPath = filterConfig.getInitParameter("uploadRepositoryPath");
      if (repositoryPath != null) {
        File file = new File(repositoryPath);
        if (!file.exists()) {
          LOG.error("Given repository Path for " + getClass().getName() + " " + repositoryPath + " doesn't exists");
        } else if (!file.isDirectory()) {
          LOG.error("Given repository Path for " + getClass().getName() + " " + repositoryPath + " is not a directory");
        } else {
          this.repositoryPath = repositoryPath;
        }
      }
  
  
      maxSize = TobagoMultipartFormdataRequest.getMaxSize(filterConfig.getInitParameter("uploadMaxFileSize"));
      if (LOG.isInfoEnabled()) {
        LOG.info("Configure uploadRepositryPath for " + getClass().getName() + " to " + this.repositoryPath);
        LOG.info("Configure uploadMaxFileSize for " + getClass().getName() + " to " + this.maxSize);
      }
  
    }
  
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
        throws IOException, ServletException {
     ServletRequest wrapper;
     if (request instanceof HttpServletRequest) {
       if (request instanceof TobagoMultipartFormdataRequest) {
         wrapper = request;
       } else {
         String contentType = request.getContentType();
         if (contentType != null
             && contentType.toLowerCase(Locale.ENGLISH).startsWith("multipart/form-data")) {
           if (LOG.isDebugEnabled()) {
             LOG.debug("Wrapping " + request.getClass().getName()
                 + " with ContentType=\"" + contentType + "\" "
                 + "into TobagoMultipartFormdataRequest");
           }
           wrapper = new TobagoMultipartFormdataRequest(
               (HttpServletRequest) request, repositoryPath, maxSize);
         } else {
           wrapper = request;
         }
       }
     } else {
       LOG.error("Not implemented for non HttpServletRequest");
       wrapper = request;
     }
 
     chain.doFilter(wrapper, response);
   }
 
   public void destroy() {
   }
 
 }