/**********************************************************************************
 * $URL: https://source.sakaiproject.org/svn/profile/tags/sakai_2-3-1/profile-app/src/java/org/sakaiproject/tool/profile/ProfileImageServlet.java $
 * $Id: ProfileImageServlet.java 8424 2006-04-27 20:23:44Z ggolden@umich.edu $
 ***********************************************************************************
 *
 * Copyright (c) 2003, 2004, 2005, 2006 The Sakai Foundation.
 * 
 * Licensed under the Educational Community License, Version 1.0 (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.opensource.org/licenses/ecl1.php
 * 
 * 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.sakaiproject.tool.profile;

import java.io.BufferedInputStream;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.OutputStream;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.sakaiproject.api.app.profile.ProfileManager;
import org.sakaiproject.component.cover.ComponentManager;

public class ProfileImageServlet extends HttpServlet
{
	private static final String PHOTO = "photo";

	private static final String CONTENT_TYPE = "image/jpeg";

	private static final String IMAGE_PATH = "/images/";

	private static final String UNAVAILABLE_IMAGE = "/officialPhotoUnavailable.jpg";

	private ProfileManager profileManager;

	private static final Log LOG = LogFactory.getLog(ProfileImageServlet.class);

	/**
	 * The doGet method of the servlet. <br>
	 * This method is called when a form has its tag value method equals to get.
	 * 
	 * @param request
	 *        the request send by the client to the server
	 * @param response
	 *        the response send by the server to the client
	 * @throws ServletException
	 *         if an error occurred
	 * @throws IOException
	 *         if an error occurred
	 */
	public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
	{
		if (LOG.isDebugEnabled()) LOG.debug("doGet(HttpServletRequest" + request + ", HttpServletResponse" + response + ")");
		response.setContentType(CONTENT_TYPE);
		String userId = null;
		byte[] institutionalPhoto;
		userId = (String) request.getParameter(PHOTO);
		if (userId != null && userId.trim().length() > 0)
		{
			institutionalPhoto = getProfileManager().getInstitutionalPhotoByUserId(userId);
			OutputStream stream = response.getOutputStream();
			if (institutionalPhoto != null && institutionalPhoto.length > 0)
			{
				LOG.debug("Display University ID photo for user:" + userId);
				response.setContentLength(institutionalPhoto.length);
				stream.write(institutionalPhoto);
				stream.flush();
			}
			else
			{
				try
				{
					BufferedInputStream in = null;
					try
					{

						in = new BufferedInputStream(new FileInputStream(getServletContext().getRealPath(IMAGE_PATH)
								+ UNAVAILABLE_IMAGE));
						int ch;

						while ((ch = in.read()) != -1)
						{
							LOG.debug("Display University ID photo for user:" + userId + " is unavailable");
							stream.write((char) ch);
						}
					}

					finally
					{
						if (in != null) in.close();
					}
				}
				catch (FileNotFoundException e)
				{
					LOG.error(e.getMessage(), e);
				}
				catch (IOException e)
				{
					LOG.error(e.getMessage(), e);
				}
			}
		}
	}

	/**
	 * get the component manager
	 * 
	 * @return profile manager
	 */
	public ProfileManager getProfileManager()
	{
		if (profileManager == null)
		{
			return (ProfileManager) ComponentManager.get(ProfileManager.class.getName());
		}
		return profileManager;
	}

}
