yacy_search_server/htroot/ViewImage.java
Michael Peter Christen 5f0ab25382 removed the option to prevent removal of & parts inside of the
MultiProtocolURI during normalform computation because that should
always be done and also be done during initialization of the
MultiProtocolURI Object. The new normalform method takes only one
argument which should be 'true' unless you know exactly what you are
doing.
2012-10-10 11:46:22 +02:00

208 lines
8.3 KiB
Java

// ViewImage.java
// -----------------------
// part of YaCy
// (C) by Michael Peter Christen; mc@yacy.net
// 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
import java.awt.Container;
import java.awt.Image;
import java.awt.MediaTracker;
import java.awt.image.BufferedImage;
import java.awt.image.Raster;
import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.net.MalformedURLException;
import java.util.Map;
import net.yacy.cora.federate.yacy.CacheStrategy;
import net.yacy.cora.protocol.Domains;
import net.yacy.cora.protocol.HeaderFramework;
import net.yacy.cora.protocol.RequestHeader;
import net.yacy.cora.storage.ConcurrentARC;
import net.yacy.crawler.data.CrawlQueues;
import net.yacy.document.ImageParser;
import net.yacy.kelondro.data.meta.DigestURI;
import net.yacy.kelondro.logging.Log;
import net.yacy.kelondro.util.FileUtils;
import net.yacy.kelondro.util.MemoryControl;
import net.yacy.repository.Blacklist.BlacklistType;
import net.yacy.search.Switchboard;
import net.yacy.server.serverObjects;
import net.yacy.server.serverSwitch;
public class ViewImage {
private static Map<String, Image> iconcache = new ConcurrentARC<String, Image>(1000, Math.max(10, Math.min(32, Runtime.getRuntime().availableProcessors() * 2)));
private static String defaulticon = "htroot/env/grafics/dfltfvcn.ico";
private static byte[] defaulticonb;
static {
try {
defaulticonb = FileUtils.read(new File(defaulticon));
} catch (final IOException e) {
}
}
public static Image respond(final RequestHeader header, final serverObjects post, final serverSwitch env) {
final Switchboard sb = (Switchboard)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", "");
final String urlLicense = post.get("code", "");
final boolean auth = Domains.isLocalhost(header.get(HeaderFramework.CONNECTION_PROP_CLIENTIP, "")) || sb.verifyAuthentication(header); // handle access rights
DigestURI url = null;
if ((urlString.length() > 0) && (auth)) try {
url = new DigestURI(urlString);
} catch (final MalformedURLException e1) {
url = null;
}
if ((url == null) && (urlLicense.length() > 0)) {
url = sb.licensedURLs.releaseLicense(urlLicense);
urlString = (url == null) ? null : url.toNormalform(true);
}
if (urlString == null) return null;
int width = post.getInt("width", 0);
int height = post.getInt("height", 0);
int maxwidth = post.getInt("maxwidth", 0);
int maxheight = post.getInt("maxheight", 0);
// get the image as stream
if (MemoryControl.shortStatus()) iconcache.clear();
Image image = iconcache.get(urlString);
if (image == null) {
byte[] resourceb = null;
if (url != null) try {
resourceb = sb.loader.loadContent(sb.loader.request(url, false, true), CacheStrategy.IFEXIST, BlacklistType.SEARCH, CrawlQueues.queuedMinLoadDelay);
} catch (final IOException e) {
Log.logFine("ViewImage", "cannot load: " + e.getMessage());
}
byte[] imgb = null;
if (resourceb == null) {
if (urlString.endsWith(".ico")) {
// load default favicon dfltfvcn.ico
if (defaulticonb == null) try {
imgb = FileUtils.read(new File(sb.getAppPath(), defaulticon));
} catch (final IOException e) {
return null;
} else {
imgb = defaulticonb;
}
} else {
return null;
}
} else {
final InputStream imgStream = new ByteArrayInputStream(resourceb);
// read image data
try {
imgb = FileUtils.read(imgStream);
} catch (final IOException e) {
return null;
} finally {
try {
imgStream.close();
} catch (final Exception e) {}
}
}
// read image
image = ImageParser.parse(urlString, imgb);
if (image == null || (auth && (width == 0 || height == 0) && maxwidth == 0 && maxheight == 0)) return image;
// find original size
final int h = image.getHeight(null);
final int w = image.getWidth(null);
// in case of not-authorized access shrink the image to prevent
// copyright problems, so that images are not larger than thumbnails
if (auth) {
maxwidth = (maxwidth == 0) ? w : maxwidth;
maxheight = (maxheight == 0) ? h : maxheight;
} else if ((w > 16) || (h > 16)) {
maxwidth = Math.min(96, w);
maxheight = Math.min(96, h);
} else {
maxwidth = 16;
maxheight = 16;
}
// calculate width & height from maxwidth & maxheight
if (maxwidth < w || maxheight < h) {
// scale image
final double hs = (w <= maxwidth) ? 1.0 : ((double) maxwidth) / ((double) w);
final double vs = (h <= maxheight) ? 1.0 : ((double) maxheight) / ((double) h);
final double scale = Math.min(hs, vs);
//if (!auth) scale = Math.min(scale, 0.6); // this is for copyright purpose
if (scale < 1.0) {
width = Math.max(1, (int) (w * scale));
height = Math.max(1, (int) (h * scale));
} else {
width = Math.max(1, w);
height = Math.max(1, h);
}
if (w != width && h != height) {
// compute scaled image
final Image scaled = image.getScaledInstance(width, height, Image.SCALE_AREA_AVERAGING);
final MediaTracker mediaTracker = new MediaTracker(new Container());
mediaTracker.addImage(scaled, 0);
try {mediaTracker.waitForID(0);} catch (final InterruptedException e) {}
// make a BufferedImage out of that
final BufferedImage i = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
try {
i.createGraphics().drawImage(scaled, 0, 0, width, height, null);
image = i;
// check outcome
final Raster raster = i.getData();
int[] pixel = new int[3];
pixel = raster.getPixel(0, 0, pixel);
if (pixel[0] != 0 || pixel[1] != 0 || pixel[2] != 0) image = i;
} catch (final Exception e) {
//java.lang.ClassCastException: [I cannot be cast to [B
}
}
} else {
// do not scale
width = w;
height = h;
}
if ((height == 16) && (width == 16) && (resourceb != null)) {
// this might be a favicon, store image to cache for faster re-load later on
iconcache.put(urlString, image);
}
}
return image;
}
}