/*
    * 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.custom.captcha;
  
  import java.io.ByteArrayOutputStream;
  import java.io.IOException;
  import java.io.InputStream;
  import java.net.URL;
  import java.util.Collections;
  import java.util.Map;
  
  import javax.faces.application.Resource;
  import javax.faces.application.ResourceHandler;
  import javax.faces.context.FacesContext;
  
  import org.apache.myfaces.shared_tomahawk.resource.ResourceHandlerSupport;
  
  
  public class CAPTCHAResource extends Resource
  {
  
      private String _captchaSessionKeyName;
      private ResourceHandlerSupport _resourceHandlerSupport;
      
      public CAPTCHAResource(ResourceHandlerSupport support, String captchaSessionKeyName, String resourceName)
      {
          super();
          _resourceHandlerSupport = support;
          _captchaSessionKeyName = captchaSessionKeyName;
          setLibraryName(CAPTCHAResourceHandlerWrapper.CAPTCHA_LIBRARY);
          setResourceName(resourceName);
          setContentType("image/png");
      }
  
      @Override
      public InputStream getInputStream() throws IOException
      {
          // Return an InputStream forces buffer the image, and really it is not necessary.
          // so, we just use CAPTCHAResourceHandlerWrapper to intercept requests and render
          // the image there directly.
          return null;
      }
      
      static class WrappedByteArrayOutputStream extends ByteArrayOutputStream{
          
          public WrappedByteArrayOutputStream(){
              super();
          }
          
          public WrappedByteArrayOutputStream(int size){
              super(size);                
          }
          
          private byte[] getInnerArray(){
              return buf; 
          }
          
          private int getInnerCount(){
              return count;
          }
      }
  
      @Override
      public String getRequestPath()
      {
          String path;
          FacesContext facesContext = FacesContext.getCurrentInstance();
  
          if (_resourceHandlerSupport.isExtensionMapping())
          {
              path = ResourceHandler.RESOURCE_IDENTIFIER + '/' + 
                  getResourceName() + _resourceHandlerSupport.getMapping();
          }
          else
          {
              String mapping = _resourceHandlerSupport.getMapping(); 
              path = ResourceHandler.RESOURCE_IDENTIFIER + '/' + getResourceName();
              path = (mapping == null) ? path : mapping + path;
          }
          path = path + "?ln=" + getLibraryName() + "&captchaSessionKeyName=" + _captchaSessionKeyName + "&dummyParameter=" + System.currentTimeMillis();
  
          return facesContext.getApplication().getViewHandler().getResourceURL(facesContext, path);
      }
 
     @Override
     public Map<String, String> getResponseHeaders()
     {
         return Collections.emptyMap();
     }
 
     @Override
     public URL getURL()
     {
         // This is a generated resource, so it does not have an inner url, return null
         return null;
     }
 
     @Override
     public boolean userAgentNeedsUpdate(FacesContext context)
     {
         return true;
     }
 }