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134 lines
4.6 KiB
134 lines
4.6 KiB
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// 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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package net.yacy.htroot;
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import java.io.IOException;
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import java.io.InputStream;
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import javax.imageio.ImageIO;
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import javax.imageio.stream.ImageInputStream;
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import net.yacy.cora.document.id.DigestURL;
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import net.yacy.cora.document.id.MultiProtocolURL;
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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.http.servlets.TemplateMissingParameterException;
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import net.yacy.peers.graphics.EncodedImage;
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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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import net.yacy.visualization.ImageViewer;
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public class ViewImage {
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/** Single instance of ImageViewer */
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private static final ImageViewer VIEWER = new ImageViewer();
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/**
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* Try parsing image from post "url" parameter (authenticated users) or from "code" parameter (non authenticated users).
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* When image format is not supported, return directly image data. When
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* image could be parsed, try encoding to target format specified by header
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* "EXT".
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*
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* @param header
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* request header
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* @param post
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* post parameters
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* @param env
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* environment
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* @return an {@link EncodedImage} instance encoded in format specified in
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* post, or an InputStream pointing to original image data.
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* Return and EncodedImage with empty data when image format is not supported,
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* a read/write or any other error occured while loading resource.
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* @throws IOException
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* when specified url is malformed.
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* Sould end in a HTTP 500 error whose processing is more
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* consistent across browsers than a response with zero content
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* bytes.
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* @throws TemplateMissingParameterException when one required parameter is missing
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*/
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public static Object respond(final RequestHeader header, final serverObjects post, final serverSwitch env)
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throws IOException {
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final Switchboard sb = (Switchboard) env;
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if(post == null) {
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throw new TemplateMissingParameterException("please fill at least url or code parameter");
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}
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final String ext = header.get(HeaderFramework.CONNECTION_PROP_EXT, null);
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final boolean auth = ImageViewer.hasFullViewingRights(header, sb); // handle access rights
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final DigestURL url = VIEWER.parseURL(post, auth);
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// get the image as stream
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EncodedImage encodedImage;
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ImageInputStream imageInStream = null;
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InputStream inStream = null;
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try {
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final String urlExt = MultiProtocolURL.getFileExtension(url.getFileName());
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if (ext != null && ext.equalsIgnoreCase(urlExt) && ImageViewer.isBrowserRendered(urlExt)) {
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return VIEWER.openInputStream(post, sb.loader, auth, url);
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}
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/*
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* When opening a file, the most efficient is to open
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* ImageInputStream directly on file
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*/
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if (url.isFile()) {
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imageInStream = ImageIO.createImageInputStream(url.getFSFile());
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} else {
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inStream = VIEWER.openInputStream(post, sb.loader, auth, url);
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imageInStream = ImageIO.createImageInputStream(inStream);
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}
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// read image
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encodedImage = VIEWER.parseAndScale(post, auth, url, ext, imageInStream);
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} catch (final Exception e) {
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/*
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* Exceptions are not propagated here : many error causes are
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* possible, network errors, incorrect or unsupported format, bad
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* ImageIO plugin... Instead return an empty EncodedImage. Caller is
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* responsible for handling this correctly (500 status code
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* response)
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*/
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encodedImage = new EncodedImage(new byte[0], ext, post.getBoolean("isStatic"));
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} finally {
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/*
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* imageInStream.close() method doesn't close source input stream
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*/
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if (inStream != null) {
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try {
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inStream.close();
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} catch (final IOException ignored) {
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}
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}
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}
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return encodedImage;
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}
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}
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