CacheResource_p.java

// CacheResource_p.java
// -----------------------
// (C) by Michael Peter Christen; mc@yacy.net
// first published on http://www.anomic.de
// Frankfurt, Germany, 2004
//
//$LastChangedDate$
//$LastChangedRevision$
//$LastChangedBy$
//
// 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.net.MalformedURLException;

import net.yacy.cora.document.id.DigestURL;
import net.yacy.cora.protocol.HeaderFramework;
import net.yacy.cora.protocol.RequestHeader;
import net.yacy.cora.protocol.ResponseHeader;
import net.yacy.cora.util.ConcurrentLog;
import net.yacy.crawler.data.Cache;
import net.yacy.document.ImageParser;
import net.yacy.server.serverObjects;
import net.yacy.server.serverSwitch;
import net.yacy.server.servletProperties;

public class CacheResource_p {

    public static Object respond(final RequestHeader header, final serverObjects post, @SuppressWarnings("unused") final serverSwitch env) {
        final servletProperties prop = new servletProperties();
        prop.put("resource", new byte[0]);

        if (post == null) return prop;

        final String u = post.get("url", "");
        DigestURL url;
        try {
            url = new DigestURL(u);
        } catch (final MalformedURLException e) {
            ConcurrentLog.logException(e);
            return prop;
        }

        byte[] resource = Cache.getContent(url.hash());
        if (resource == null) return prop;

        // check request type
        if (header.get("EXT", "html").equals("png")) {
            // a png was requested
            return ImageParser.parse(u, resource);
        }
        // get response header and set mime type
        ResponseHeader responseHeader = Cache.getResponseHeader(url.hash());
        String resMime = responseHeader == null ? null : responseHeader.mime();
        if (resMime != null) {
            final ResponseHeader outgoingHeader = new ResponseHeader(200);
            outgoingHeader.put(HeaderFramework.CONTENT_TYPE, resMime);
            prop.setOutgoingHeader(outgoingHeader);
        }

        // add resource
        prop.put("resource", resource);
        return prop;
    }
}