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104 lines
4.0 KiB
104 lines
4.0 KiB
// CacheResource_p.java
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// -----------------------
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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, 2004
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//
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//$LastChangedDate$
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//$LastChangedRevision$
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//$LastChangedBy$
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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.io.IOException;
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import java.net.MalformedURLException;
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import java.nio.ByteBuffer;
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import java.nio.CharBuffer;
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import java.nio.charset.Charset;
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import net.yacy.cora.document.id.DigestURL;
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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.RequestHeader;
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import net.yacy.cora.protocol.ResponseHeader;
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import net.yacy.cora.util.ConcurrentLog;
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import net.yacy.crawler.data.Cache;
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import net.yacy.crawler.retrieval.Response;
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import net.yacy.document.ImageParser;
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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.server.servletProperties;
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public class CacheResource_p {
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public static Object respond(final RequestHeader header, final serverObjects post, final serverSwitch env) {
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Switchboard sb = (Switchboard) env;
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final servletProperties prop = new servletProperties();
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prop.put("resource", new byte[0]);
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if (post == null) return prop;
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boolean load = post.getBoolean("load");
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final String u = post.get("url", "");
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DigestURL url;
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try {
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url = new DigestURL(u);
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} catch (final MalformedURLException e) {
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ConcurrentLog.logException(e);
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return prop;
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}
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byte[] resource = Cache.getContent(url.hash());
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ResponseHeader responseHeader = null;
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if (resource == null) {
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if (load) {
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try {
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final Response response = sb.loader.load(sb.loader.request(url, false, true), CacheStrategy.NOCACHE, Integer.MAX_VALUE, null, ClientIdentification.yacyInternetCrawlerAgent);
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responseHeader = response.getResponseHeader();
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resource = response.getContent();
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} catch (IOException e) {
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return prop;
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}
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} else return prop;
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}
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// check request type
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if (header.get("EXT", "html").equals("png")) {
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// a png was requested
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return ImageParser.parse(u, resource);
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}
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// get response header and set mime type
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if (responseHeader == null) {
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responseHeader = Cache.getResponseHeader(url.hash());
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}
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// because for display a servlet html variable is use
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// which is internally processed using utf-8, we need to convert encoding of cached resource
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final String charset = responseHeader.getCharacterEncoding();
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if (charset != null && !charset.equalsIgnoreCase("utf-8")) {
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CharBuffer cb = Charset.forName(charset).decode(ByteBuffer.wrap(resource));
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ByteBuffer x = Charset.forName("UTF-16").encode(cb); // encode to a default java string (which uses utf-16 and is handled correct for servlet content)
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prop.put("resource", x.asCharBuffer().toString());
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} else {
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prop.put("resource", resource);
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}
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// add resource
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return prop;
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}
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}
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