// 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.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.net.MalformedURLException;
import java.util.HashMap;
import de.anomic.http.httpHeader;
import de.anomic.plasma.plasmaSnippetCache;
import de.anomic.plasma.plasmaSwitchboard;
import de.anomic.server.serverFileUtils;
import de.anomic.server.serverObjects;
import de.anomic.server.serverSwitch;
import de.anomic.yacy.yacyURL;
import de.anomic.ymage.ymageImageParser;
public class ViewImage {
private static HashMap iconcache = new HashMap();
private static String defaulticon = "htroot/env/grafics/dfltfvcn.ico";
public static Image respond(httpHeader header, serverObjects post, serverSwitch env) {
plasmaSwitchboard sb = (plasmaSwitchboard)env;
// the url to the image can be either submitted with an url in clear text, or using a license key
// if the url is given as clear text, the user must be authorized as admin
// the license can be used also from non-authorized users
String urlString = post.get("url", "");
String urlLicense = post.get("code", "");
boolean auth = ((String) header.get("CLIENTIP", "")).equals("localhost") || sb.verifyAuthentication(header, true); // handle access rights
yacyURL url = null;
if ((urlString.length() > 0) && (auth)) try {
url = new yacyURL(urlString, null);
} catch (MalformedURLException e1) {
url = null;
}
if ((url == null) && (urlLicense.length() > 0)) {
url = sb.licensedURLs.releaseLicense(urlLicense);
urlString = (url == null) ? null : url.toNormalform(true, true);
}
if (url == null) return null;
System.out.println("loading image from " + url.toString());
int width = post.getInt("width", 0);
int height = post.getInt("height", 0);
int maxwidth = post.getInt("maxwidth", 0);
int maxheight = post.getInt("maxheight", 0);
int timeout = post.getInt("timeout", 5000);
// getting the image as stream
Image scaled = (Image) iconcache.get(urlString);
if (scaled == null) {
Object[] resource = plasmaSnippetCache.getResource(url, true, timeout, false);
byte[] imgb = null;
if (resource == null) {
if (urlString.endsWith(".ico")) {
// load default favicon dfltfvcn.ico
try {
imgb = serverFileUtils.read(new File(sb.getRootPath(), defaulticon));
} catch (IOException e) {
return null;
}
} else {
return null;
}
} else {
InputStream imgStream = (InputStream) resource[0];
if (imgStream == null) return null;
// read image data
try {
imgb = serverFileUtils.read(imgStream);
} catch (IOException e) {
return null;
} finally {
try {
imgStream.close();
} catch (Exception e) {/* ignore this */}
}
}
// read image
Image image = ymageImageParser.parse(urlString.toString(), imgb);
if ((auth) && ((width == 0) || (height == 0)) && (maxwidth == 0) && (maxheight == 0)) return image;
// find original size
int h = image.getHeight(null);
int w = image.getWidth(null);
// System.out.println("DEBUG: get access to image " +
// url.toNormalform() + " is " + ((auth) ? "authorized" : "NOT
// authorized"));
// in case of not-authorized access shrink the image to prevent
// copyright problems
// so that images are not larger than thumbnails
if ((!auth) && ((w > 16) || (h > 16))) {
maxwidth = (int) Math.min(64.0, w * 0.6);
maxheight = (int) Math.min(64.0, h * 0.6);
}
// calculate width & height from maxwidth & maxheight
if ((maxwidth != 0) || (maxheight != 0)) {
double hs = (w <= maxwidth) ? 1.0 : ((double) maxwidth) / ((double) w);
double vs = (h <= maxheight) ? 1.0 : ((double) maxheight) / ((double) h);
double scale = Math.min(hs, vs);
if (!auth) scale = Math.min(scale, 0.6); // this is for copyright purpose
if (scale < 1.0) {
width = (int) (((double) w) * scale);
height = (int) (((double) h) * scale);
} else {
width = w;
height = h;
}
} else {
width = w;
height = h;
}
// check for minimum values
width = Math.max(width, 1);
height = Math.max(height, 1);
// scale image
scaled = ((w == width) && (h == height)) ? image : image.getScaledInstance(width, height, Image.SCALE_AREA_AVERAGING);
MediaTracker mediaTracker = new MediaTracker(new Container());
mediaTracker.addImage(scaled, 0);
try {mediaTracker.waitForID(0);} catch (InterruptedException e) {}
if ((height == 16) && (width == 16) && (resource != null)) {
// this might be a favicon, store image to cache for faster re-load later on
iconcache.put(urlString, scaled);
}
}
return scaled;
}
}