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215 lines
8.6 KiB
215 lines
8.6 KiB
// ViewImage.java
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// -----------------------
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// part of YaCy
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// (C) by Michael Peter Christen; mc@yacy.net
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// first published on http://www.anomic.de
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// Frankfurt, Germany, 2006
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// created 03.04.2006
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//
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// This program is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation; either version 2 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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import java.awt.Container;
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import java.awt.Image;
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import java.awt.MediaTracker;
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import java.awt.image.BufferedImage;
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import java.awt.image.Raster;
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import java.io.ByteArrayInputStream;
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import java.io.File;
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import java.io.IOException;
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import java.io.InputStream;
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import java.net.MalformedURLException;
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import java.util.Map;
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import net.yacy.cora.federate.yacy.CacheStrategy;
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import net.yacy.cora.protocol.ClientIdentification;
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import net.yacy.cora.protocol.Domains;
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import net.yacy.cora.protocol.HeaderFramework;
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import net.yacy.cora.protocol.RequestHeader;
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import net.yacy.cora.storage.ConcurrentARC;
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import net.yacy.cora.util.ConcurrentLog;
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import net.yacy.data.URLLicense;
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import net.yacy.document.ImageParser;
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import net.yacy.kelondro.data.meta.DigestURI;
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import net.yacy.kelondro.util.FileUtils;
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import net.yacy.kelondro.util.MemoryControl;
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import net.yacy.kelondro.workflow.WorkflowProcessor;
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import net.yacy.repository.Blacklist.BlacklistType;
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import net.yacy.search.Switchboard;
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import net.yacy.server.serverObjects;
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import net.yacy.server.serverSwitch;
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public class ViewImage {
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private static Map<String, Image> iconcache = new ConcurrentARC<String, Image>(1000, Math.max(10, Math.min(32, WorkflowProcessor.availableCPU * 2)));
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private static String defaulticon = "htroot/env/grafics/dfltfvcn.ico";
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private static byte[] defaulticonb;
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static {
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try {
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defaulticonb = FileUtils.read(new File(defaulticon));
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} catch (final IOException e) {
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}
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}
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public static Image respond(final RequestHeader header, final serverObjects post, final serverSwitch env) {
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final Switchboard sb = (Switchboard)env;
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// the url to the image can be either submitted with an url in clear text, or using a license key
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// if the url is given as clear text, the user must be authorized as admin
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// the license can be used also from non-authorized users
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String urlString = post.get("url", "");
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final String urlLicense = post.get("code", "");
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final boolean auth = Domains.isLocalhost(header.get(HeaderFramework.CONNECTION_PROP_CLIENTIP, "")) || sb.verifyAuthentication(header); // handle access rights
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DigestURI url = null;
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if ((urlString.length() > 0) && (auth)) try {
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url = new DigestURI(urlString);
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} catch (final MalformedURLException e1) {
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url = null;
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}
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if ((url == null) && (urlLicense.length() > 0)) {
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urlString = URLLicense.releaseLicense(urlLicense);
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try {
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url = new DigestURI(urlString);
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} catch (final MalformedURLException e1) {
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url = null;
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urlString = null;
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}
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}
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if (urlString == null) return null;
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int width = post.getInt("width", 0);
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int height = post.getInt("height", 0);
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int maxwidth = post.getInt("maxwidth", 0);
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int maxheight = post.getInt("maxheight", 0);
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// get the image as stream
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if (MemoryControl.shortStatus()) iconcache.clear();
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Image image = iconcache.get(urlString);
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if (image == null) {
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byte[] resourceb = null;
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if (url != null) try {
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resourceb = sb.loader.loadContent(sb.loader.request(url, false, true), CacheStrategy.IFEXIST, BlacklistType.SEARCH, ClientIdentification.minLoadDelay(), ClientIdentification.DEFAULT_TIMEOUT);
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} catch (final IOException e) {
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ConcurrentLog.fine("ViewImage", "cannot load: " + e.getMessage());
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}
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byte[] imgb = null;
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if (resourceb == null) {
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if (urlString.endsWith(".ico")) {
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// load default favicon dfltfvcn.ico
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if (defaulticonb == null) try {
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imgb = FileUtils.read(new File(sb.getAppPath(), defaulticon));
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} catch (final IOException e) {
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return null;
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} else {
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imgb = defaulticonb;
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}
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} else {
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return null;
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}
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} else {
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final InputStream imgStream = new ByteArrayInputStream(resourceb);
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// read image data
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try {
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imgb = FileUtils.read(imgStream);
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} catch (final IOException e) {
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return null;
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} finally {
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try {
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imgStream.close();
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} catch (final Exception e) {}
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}
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}
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// read image
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image = ImageParser.parse(urlString, imgb);
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if (image == null || (auth && (width == 0 || height == 0) && maxwidth == 0 && maxheight == 0)) return image;
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// find original size
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final int h = image.getHeight(null);
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final int w = image.getWidth(null);
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// in case of not-authorized access shrink the image to prevent
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// copyright problems, so that images are not larger than thumbnails
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if (auth) {
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maxwidth = (maxwidth == 0) ? w : maxwidth;
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maxheight = (maxheight == 0) ? h : maxheight;
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} else if ((w > 16) || (h > 16)) {
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maxwidth = Math.min(96, w);
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maxheight = Math.min(96, h);
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} else {
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maxwidth = 16;
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maxheight = 16;
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}
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// calculate width & height from maxwidth & maxheight
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if (maxwidth < w || maxheight < h) {
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// scale image
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final double hs = (w <= maxwidth) ? 1.0 : ((double) maxwidth) / ((double) w);
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final double vs = (h <= maxheight) ? 1.0 : ((double) maxheight) / ((double) h);
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final double scale = Math.min(hs, vs);
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//if (!auth) scale = Math.min(scale, 0.6); // this is for copyright purpose
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if (scale < 1.0) {
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width = Math.max(1, (int) (w * scale));
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height = Math.max(1, (int) (h * scale));
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} else {
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width = Math.max(1, w);
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height = Math.max(1, h);
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}
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if (w != width && h != height) {
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// compute scaled image
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final Image scaled = image.getScaledInstance(width, height, Image.SCALE_AREA_AVERAGING);
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final MediaTracker mediaTracker = new MediaTracker(new Container());
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mediaTracker.addImage(scaled, 0);
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try {mediaTracker.waitForID(0);} catch (final InterruptedException e) {}
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// make a BufferedImage out of that
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final BufferedImage i = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
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try {
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i.createGraphics().drawImage(scaled, 0, 0, width, height, null);
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image = i;
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// check outcome
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final Raster raster = i.getData();
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int[] pixel = new int[3];
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pixel = raster.getPixel(0, 0, pixel);
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if (pixel[0] != 0 || pixel[1] != 0 || pixel[2] != 0) image = i;
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} catch (final Exception e) {
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//java.lang.ClassCastException: [I cannot be cast to [B
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}
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}
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} else {
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// do not scale
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width = w;
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height = h;
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}
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if ((height == 16) && (width == 16) && (resourceb != null)) {
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// this might be a favicon, store image to cache for faster re-load later on
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iconcache.put(urlString, image);
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}
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}
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return image;
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}
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}
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