support for external Thumbnailers.

TODO: Mimetype fix
TODO: Demo Thumbnailer


git-svn-id: https://svn.berlios.de/svnroot/repos/yacy/trunk@3245 6c8d7289-2bf4-0310-a012-ef5d649a1542

htroot/Thumbnail.html

@@ -0,0 +1 @@
+#[image]#

htroot/Thumbnail.java

@@ -0,0 +1,69 @@
+//Thumbnail.java
+//------------
+// part of YACY
+//
+// (C) 2007 Alexander Schier
+//
+// last change: $LastChangedDate:  $ by $LastChangedBy: $
+// $LastChangedRevision: $
+//
+// 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
+
+import java.io.BufferedReader;
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.IOException;
+import java.io.InputStreamReader;
+
+import de.anomic.http.httpHeader;
+import de.anomic.plasma.plasmaSwitchboard;
+import de.anomic.plasma.plasmaURL;
+import de.anomic.server.serverObjects;
+import de.anomic.server.serverSwitch;
+import de.anomic.server.servletProperties;
+
+public class Thumbnail{
+    public static serverObjects respond(httpHeader header, serverObjects post, serverSwitch env) {
+        servletProperties prop = new servletProperties();
+        String command=env.getConfig("thumbnailProgram", "");
+        if(command.equals("")||post==null||!post.containsKey("url")){
+            prop.put("image", "thumbnail cannot be generated"); //TODO: put a "thumbnail not possible" image.
+            return prop;
+        }
+        String[] cmdline=new String[3];
+        cmdline[0]=env.getConfig("thumbnailProgram", "");
+        cmdline[1]=post.get("url", "");
+        plasmaSwitchboard sb=plasmaSwitchboard.getSwitchboard();
+        File path=new File(sb.workPath, plasmaURL.urlHash(cmdline[1])+".png");
+        cmdline[2]=path.getAbsolutePath();//does not contain an extension!
+        try {
+            Runtime.getRuntime().exec(cmdline);
+            BufferedReader br = new BufferedReader(new InputStreamReader(new FileInputStream(path)));
+            String line;
+            StringBuffer image=new StringBuffer();
+            while((line=br.readLine())!=null){
+                image.append(line);
+            }
+            //path.delete(); //we do not cache, yet.
+            prop.put("image", image.toString());
+        } catch (IOException e) {
+            prop.put("image", "error creating thumbnail");//TODO: put a "thumbnail error" image.
+        }
+		httpHeader out_header=new httpHeader();
+		out_header.put(httpHeader.CONTENT_TYPE, "image/png");
+		prop.setOutgoingHeader(out_header);
+        return prop;
+    }
+}

yacy.init

@@ -878,3 +878,6 @@ WikiAccess = admin
 # If this profile setting is empty, a hard-coded profile from plasmaSearchRanking is used
 rankingProfile =
 
+#optional extern thumbnail program.
+#the program must accept the invocation PROGRAM http://url /path/to/filename
+thumbnailProgram =