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| package photospace.web; |
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| |
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| import java.awt.*; |
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| import java.awt.image.*; |
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| import java.io.*; |
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| import java.text.*; |
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| import java.util.*; |
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| import javax.servlet.*; |
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| import javax.servlet.http.*; |
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| import org.apache.commons.logging.*; |
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| import org.springframework.context.*; |
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| import org.springframework.web.context.support.*; |
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| import com.sun.image.codec.jpeg.*; |
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| import photospace.graphics.*; |
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| import photospace.vfs.*; |
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| |
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| public class ImageServlet |
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| extends HttpServlet |
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| { |
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| private static final Log log = LogFactory.getLog(ImageServlet.class); |
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| |
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| private static final int inputBufferSize = 2048; |
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| private static final int outputBufferSize = 2048; |
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| private static final SimpleDateFormat format; |
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| static |
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| { |
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| format = new SimpleDateFormat("EEE, dd MMM yyyy HH:mm:ss zzz", Locale.US);
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| format.setTimeZone(TimeZone.getTimeZone("GMT"));
|
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| } |
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| |
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| private FileSystem filesystem; |
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| private int expires = 30; |
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| private ImageCache images; |
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| |
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| public void init(ServletConfig config) throws ServletException
|
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| { |
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| super.init(config);
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| |
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| if (config.getInitParameter("expires-seconds") != null)
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| expires = Integer.parseInt(config.getInitParameter("expires-seconds"));
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| |
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| ApplicationContext context = WebApplicationContextUtils.getWebApplicationContext(config.getServletContext());
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43 |
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| if (context != null)
|
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| { |
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| filesystem = (FileSystem) context.getBean("filesystem");
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| images = (ImageCache) context.getBean("imageCache");
|
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| } |
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| else |
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| { |
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| filesystem = new FileSystemImpl();
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51 |
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| try
|
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| { |
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| filesystem.setRoot(new File(config.getServletContext().getRealPath("/")));
|
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| } |
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| catch (IOException e) |
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| { |
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| throw new ServletException(e);
|
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| } |
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| images = new ImageCache();
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| images.setRoot(new File(System.getProperty("java.io.tmpdir")));
|
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| } |
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| } |
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| |
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| public void doGet(HttpServletRequest request, HttpServletResponse response)
|
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| throws ServletException, IOException |
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| { |
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| String path = request.getPathInfo();
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| |
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| if (path == null)
|
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| { |
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| sendNotFound(response, path);
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| return;
|
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| } |
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| |
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| |
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| File file;
|
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| try
|
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| { |
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| file = filesystem.getAsset(path);
|
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| } |
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| catch (FileNotFoundException e) |
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| { |
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| sendNotFound(response, path);
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| return;
|
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| } |
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| |
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| String lastModified = format.format(new Date(file.lastModified()));
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| String ifModified = request.getHeader("If-Modified-Since");
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89 |
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| if (ifModified != null && ifModified.startsWith(lastModified))
|
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| { |
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| if (log.isDebugEnabled()) log.debug("Sending 403 for " + file);
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| response.setHeader("Expires", getExpires());
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| response.sendError(HttpServletResponse.SC_NOT_MODIFIED);
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| return;
|
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| } |
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| |
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| String contentType = getServletContext().getMimeType(file.getPath());
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| response.setContentType(contentType);
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| response.setHeader("Last-Modified", lastModified);
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| response.setHeader("Expires", getExpires());
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| |
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| if (log.isDebugEnabled()) log.debug("Serving " + file + " for " + request.getQueryString());
|
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| |
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| int width = -1;
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| int height = -1;
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| if (!isEmpty(request.getParameter("w"))) width = (int) Double.parseDouble(request.getParameter("w"));
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| if (!isEmpty(request.getParameter("h"))) height = (int) Double.parseDouble(request.getParameter("h"));
|
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| if (width > 0 || height > 0)
|
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| { |
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| Transform transform = new Transform(new Dimension(width, height), request.getParameter("scale"));
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| |
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| File cached = images.cachedFile(path, transform);
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| if (cached.exists() && cached.lastModified() >= file.lastModified())
|
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| { |
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| log.debug("Using cached file " + cached);
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| sendFile(response, cached);
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| return;
|
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| } |
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| |
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| synchronized (this.getClass())
|
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| { |
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| BufferedImage image = images.scale(Sampler.read(file), path, transform);
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| |
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| response.setContentLength(Sampler.getBytes(image).length);
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| write(image, response.getOutputStream());
|
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| } |
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| } |
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| else |
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| { |
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| sendFile(response, file);
|
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| } |
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| } |
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| |
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| private void sendFile(HttpServletResponse response, File file)
|
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| throws IOException |
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| { |
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| response.setContentLength((int) file.length());
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| write(file, response.getOutputStream());
|
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| } |
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| |
141 |
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| private boolean isEmpty(String s)
|
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| { |
143 |
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| return s == null || "".equals(s);
|
144 |
| } |
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| |
146 |
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| private String getExpires()
|
147 |
| { |
148 |
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| return format.format(new Date(new Date().getTime() + expires * 1000));
|
149 |
| } |
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| |
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| private void write(BufferedImage image, OutputStream out) throws IOException
|
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| { |
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| JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);
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| encoder.encode(image);
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| out.close();
|
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| } |
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| |
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| private void write(File file, OutputStream out) throws IOException
|
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| { |
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| InputStream in = new BufferedInputStream(new FileInputStream(file));
|
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| write(in, out);
|
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| } |
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| |
164 |
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| public static void write(InputStream in, OutputStream out) throws IOException
|
165 |
| { |
166 |
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| byte buffer[] = new byte[inputBufferSize];
|
167 |
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| int len = buffer.length;
|
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| |
169 |
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| try
|
170 |
| { |
171 |
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| while (true)
|
172 |
| { |
173 |
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| len = in.read(buffer);
|
174 |
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| if (len == -1) break;
|
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| out.write(buffer, 0, len);
|
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| } |
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| } |
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| finally |
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| { |
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| try { in.close(); }
|
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| finally { out.close(); }
|
182 |
| } |
183 |
| } |
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| |
185 |
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| private void sendNotFound(HttpServletResponse response, String path) throws IOException
|
186 |
| { |
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| response.sendError(HttpServletResponse.SC_NOT_FOUND, path + " is not an existing photo");
|
188 |
0
| return;
|
189 |
| } |
190 |
| } |