added image-viewer servlet that can do:

- each image that is requested is stored in the cache
- the image is taken from the cache if exists there
- the image can be scaled
The purpose of creation a scaled image is because of copyright problems
In a further stept the retrieval of not-shrinked images is restricted
to either access from localhost or with given authentication
This servlet can be used for image-preview purpose after an image search

git-svn-id: https://svn.berlios.de/svnroot/repos/yacy/trunk@1989 6c8d7289-2bf4-0310-a012-ef5d649a1542

htroot/ViewImage.java

@@ -0,0 +1,89 @@
+// ViewImage.java
+// -----------------------
+// part of YaCy
+// (C) by Michael Peter Christen; mc@anomic.de
+// first published on http://www.anomic.de
+// Frankfurt, Germany, 2006
+// created 03.04.2006
+//
+// This program is free software; you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation; either version 2 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program; if not, write to the Free Software
+// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+//
+// Using this software in any meaning (reading, learning, copying, compiling,
+// running) means that you agree that the Author(s) is (are) not responsible
+// for cost, loss of data or any harm that may be caused directly or indirectly
+// by usage of this softare or this documentation. The usage of this software
+// is on your own risk. The installation and usage (starting/running) of this
+// software may allow other people or application to access your computer and
+// any attached devices and is highly dependent on the configuration of the
+// software which must be done by the user of the software; the author(s) is
+// (are) also not responsible for proper configuration and usage of the
+// software, even if provoked by documentation provided together with
+// the software.
+//
+// Any changes to this file according to the GPL as documented in the file
+// gpl.txt aside this file in the shipment you received can be done to the
+// lines that follows this copyright notice here, but changes must not be
+// done inside the copyright notive above. A re-distribution must contain
+// the intact and unchanged copyright notice.
+// Contributions and changes to the program code must be marked as such.
+
+import java.awt.Container;
+import java.awt.Image;
+import java.awt.MediaTracker;
+import java.awt.Toolkit;
+import java.net.MalformedURLException;
+import java.net.URL;
+
+import de.anomic.http.httpHeader;
+import de.anomic.plasma.plasmaSwitchboard;
+import de.anomic.server.serverObjects;
+import de.anomic.server.serverSwitch;
+
+public class ViewImage {
+
+    public static Image respond(httpHeader header, serverObjects post, serverSwitch env) {
+        
+        plasmaSwitchboard sb = (plasmaSwitchboard)env;     
+        
+        String urls = post.get("url", "");
+        URL url;
+        try {
+            url = new URL(urls);
+        } catch (MalformedURLException e1) {
+            return null;
+        }
+        int width = post.getInt("width", 0);
+        int height = post.getInt("height", 0);
+        
+        // load image
+        byte[] imgb = sb.snippetCache.getResource(url, true);
+        if (imgb == null) return null;
+        
+        // create image 
+        MediaTracker mediaTracker = new MediaTracker(new Container()); 
+        Image original = Toolkit.getDefaultToolkit().createImage(imgb); 
+        mediaTracker.addImage(original, 0); 
+        try {mediaTracker.waitForID(0);} catch (InterruptedException e) {} 
+        if ((width == 0) || (height == 0)) return original;
+        
+        // scale image 
+        Image scaled = original.getScaledInstance(width, height, Image.SCALE_AREA_AVERAGING); 
+        mediaTracker.addImage(scaled, 0); 
+        try {mediaTracker.waitForID(0);} catch (InterruptedException e) {} 
+
+        return scaled;
+    }
+    
+}

source/de/anomic/http/httpdFileHandler.java

@@ -74,6 +74,8 @@
 
 package de.anomic.http;
 
+import java.awt.Image;
+import java.awt.image.BufferedImage;
 import java.io.BufferedInputStream;
 import java.io.ByteArrayInputStream;
 import java.io.File;
@@ -456,12 +458,12 @@ public final class httpdFileHandler extends httpdAbstractHandler implements http
             
             if ((targetClass != null) && (path.endsWith("png"))) {
                 // call an image-servlet to produce an on-the-fly - generated image
-                ymagePainter yp = null;
+                Object img = null;
                 try {
                     requestHeader.put("CLIENTIP", conProp.getProperty("CLIENTIP"));
                     requestHeader.put("PATH", path);
                     // in case that there are no args given, args = null or empty hashmap
-                    yp = (ymagePainter) rewriteMethod(targetClass).invoke(null, new Object[] {requestHeader, args, switchboard});
+                    img = rewriteMethod(targetClass).invoke(null, new Object[] {requestHeader, args, switchboard});
                 } catch (InvocationTargetException e) {
                     this.theLogger.logSevere("INTERNAL ERROR: " + e.toString() + ":" +
                     e.getMessage() +
@@ -471,28 +473,66 @@ public final class httpdFileHandler extends httpdAbstractHandler implements http
                     "; java.awt.graphicsenv='" + System.getProperty("java.awt.graphicsenv","") + "'",e);
                     targetClass = null;
                 }
-                if (yp == null) {
+                if (img == null) {
                     // error with image generation; send file-not-found
                     httpd.sendRespondError(this.connectionProperties,out,3,404,"File not Found",null,null);
                 } else {
-                    // send an image to client
-                    targetDate = new Date(System.currentTimeMillis());
-                    nocache = true;
-                    String mimeType = mimeTable.getProperty(targetExt,"text/html");
-                    
-                    // generate an byte array from the generated image
-                    serverByteBuffer baos = new serverByteBuffer();
-                    //ymagePNGEncoderJDE jde = new ymagePNGEncoderJDE((ymageMatrixPainter) yp, ymagePNGEncoderJDE.FILTER_NONE, 0);
-                    //byte[] result = jde.pngEncode();
-                    ImageIO.write(ymagePNGEncoderAWT.toImage((ymageMatrixPainter) yp, true), targetExt, baos);
-                    byte[] result = baos.toByteArray();
-                    baos.close(); baos = null;
-                    
-                    // write the array to the client
-                    httpd.sendRespondHeader(this.connectionProperties, out, httpVersion, 200, null, mimeType, result.length, targetDate, null, null, null, null, nocache);
-                    if (! method.equals(httpHeader.METHOD_HEAD)) {
-                        Thread.sleep(200); // see below
-                        serverFileUtils.write(result, out);
+                    if (img instanceof ymagePainter) {
+                        ymagePainter yp = (ymagePainter) img;
+                        // send an image to client
+                        targetDate = new Date(System.currentTimeMillis());
+                        nocache = true;
+                        String mimeType = mimeTable.getProperty(targetExt, "text/html");
+
+                        // generate an byte array from the generated image
+                        serverByteBuffer baos = new serverByteBuffer();
+                        // ymagePNGEncoderJDE jde = new
+                        // ymagePNGEncoderJDE((ymageMatrixPainter) yp,
+                        // ymagePNGEncoderJDE.FILTER_NONE, 0);
+                        // byte[] result = jde.pngEncode();
+                        ImageIO.write(ymagePNGEncoderAWT.toImage(
+                                        (ymageMatrixPainter) yp, true),
+                                        targetExt, baos);
+                        byte[] result = baos.toByteArray();
+                        baos.close();
+                        baos = null;
+
+                        // write the array to the client
+                        httpd.sendRespondHeader(this.connectionProperties, out,
+                                httpVersion, 200, null, mimeType,
+                                result.length, targetDate, null, null, null,
+                                null, nocache);
+                        if (!method.equals(httpHeader.METHOD_HEAD)) {
+                            Thread.sleep(200); // see below
+                            serverFileUtils.write(result, out);
+                        }
+                    }
+                    if (img instanceof Image) {
+                        Image i = (Image) img;
+                        // send an image to client
+                        targetDate = new Date(System.currentTimeMillis());
+                        nocache = true;
+                        String mimeType = mimeTable.getProperty(targetExt, "text/html");
+
+                        // generate an byte array from the generated image
+                        serverByteBuffer baos = new serverByteBuffer();
+                        BufferedImage bi = new BufferedImage(i.getWidth(null), i.getHeight(null), BufferedImage.TYPE_INT_RGB);
+                        bi.createGraphics().drawImage(i, 0, 0, i.getWidth(null), i.getHeight(null), null); 
+                        ImageIO.write(bi, targetExt, baos);
+
+                        byte[] result = baos.toByteArray();
+                        baos.close();
+                        baos = null;
+
+                        // write the array to the client
+                        httpd.sendRespondHeader(this.connectionProperties, out,
+                                httpVersion, 200, null, mimeType,
+                                result.length, targetDate, null, null, null,
+                                null, nocache);
+                        if (!method.equals(httpHeader.METHOD_HEAD)) {
+                            Thread.sleep(200); // see below
+                            serverFileUtils.write(result, out);
+                        }
                     }
                 }
             } else if ((targetClass != null) && (path.endsWith(".stream"))) {

source/de/anomic/plasma/plasmaCrawlWorker.java

@@ -215,6 +215,7 @@ public final class plasmaCrawlWorker extends Thread {
                  this.socketTimeout,
                  this.sb.remoteProxyConfig,
                  this.cacheManager,
+                 false,
                  this.log
             );
 
@@ -256,6 +257,7 @@ public final class plasmaCrawlWorker extends Thread {
             int socketTimeout,
             httpRemoteProxyConfig theRemoteProxyConfig,
             plasmaHTCache cacheManager,
+            boolean acceptAllContent,
             serverLog log
         ) throws IOException {
         return load(url,
@@ -269,7 +271,8 @@ public final class plasmaCrawlWorker extends Thread {
              cacheManager,
              log,
              DEFAULT_CRAWLING_RETRY_COUNT,
-             true
+             true,
+             acceptAllContent
         );
     }
 
@@ -285,7 +288,8 @@ public final class plasmaCrawlWorker extends Thread {
             plasmaHTCache cacheManager,
             serverLog log,
             int crawlingRetryCount,
-            boolean useContentEncodingGzip
+            boolean useContentEncodingGzip,
+            boolean acceptAllContent
         ) throws IOException {
         if (url == null) return null;
 
@@ -378,7 +382,7 @@ public final class plasmaCrawlWorker extends Thread {
                 // request has been placed and result has been returned. work off response
                 File cacheFile = cacheManager.getCachePath(url);
                 try {
-                    if (plasmaParser.supportedContent(plasmaParser.PARSER_MODE_CRAWLER,url,res.responseHeader.mime())) {
+                    if ((acceptAllContent) || (plasmaParser.supportedContent(plasmaParser.PARSER_MODE_CRAWLER,url,res.responseHeader.mime()))) {
                         if (cacheFile.isFile()) {
                             cacheManager.deleteFile(url);
                         }
@@ -465,7 +469,8 @@ public final class plasmaCrawlWorker extends Thread {
                              cacheManager,
                              log,
                              --crawlingRetryCount,
-                             useContentEncodingGzip
+                             useContentEncodingGzip,
+                             acceptAllContent
                         );
                         
                         if (redirectedEntry != null) {
@@ -574,6 +579,7 @@ public final class plasmaCrawlWorker extends Thread {
                      cacheManager,
                      log,
                      --crawlingRetryCount,
+                     false,
                      false
                 );
             }

source/de/anomic/plasma/plasmaSnippetCache.java

@@ -424,6 +424,7 @@ public class plasmaSnippetCache {
             socketTimeout,
             this.sb.remoteProxyConfig,
             this.cacheManager,
+            true,
             this.log);
     }