/*
* Copyright (c) 2009 Los Alamos National Security, LLC.
*
* Los Alamos National Laboratory
* Research Library
* Digital Library Research & Prototyping Team
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
*/
package gov.lanl.adore.djatoka.openurl;
import java.io.IOException;
import java.net.URI;
import java.net.URISyntaxException;
import java.util.HashMap;
import java.util.Properties;
import javax.servlet.http.HttpServletResponse;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.node.ObjectNode;
import gov.lanl.adore.djatoka.io.FormatConstants;
import gov.lanl.adore.djatoka.util.IOUtils;
import gov.lanl.util.HttpDate;
import info.freelibrary.djatoka.view.IdentifierResolver;
import info.openurl.oom.ContextObject;
import info.openurl.oom.OpenURLRequest;
import info.openurl.oom.OpenURLRequestProcessor;
import info.openurl.oom.OpenURLResponse;
import info.openurl.oom.Service;
import info.openurl.oom.config.ClassConfig;
import info.openurl.oom.config.OpenURLConfig;
import info.openurl.oom.entities.ServiceType;
/**
* The OpenURLJP2Ping OpenURL Service
*
* @author Ryan Chute
*/
public class OpenURLJP2Ping implements Service, FormatConstants {
private static Logger LOGGER = LoggerFactory.getLogger(OpenURLJP2Ping.class);
private static final String DEFAULT_IMPL_CLASS = IdentifierResolver.class.getCanonicalName();
private static final String PROPS_KEY_IMPL_CLASS = "OpenURLJP2KService.referentResolverImpl";
private static final String SVC_ID = "info:lanl-repo/svc/ping";
private static final String STATUS_OK = "OK";
private static final String STATUS_ACCEPTED = "PROCESSING";
private static final String RESPONSE_TYPE = "application/json";
private static String implClass = null;
private static Properties props = new Properties();
/**
* Construct an info:lanl-repo/svc/ping web service class. Initializes Referent Resolver instance using
* OpenURLJP2KService.referentResolverImpl property.
*
* @param openURLConfig OOM Properties forwarded from OpenURLServlet
* @param classConfig Implementation Properties forwarded from OpenURLServlet
* @throws ResolverException
*/
public OpenURLJP2Ping(final OpenURLConfig openURLConfig, final ClassConfig classConfig) throws ResolverException {
try {
if (!ReferentManager.isInit()) {
props = IOUtils.loadConfigByCP(classConfig.getArg("props"));
implClass = props.getProperty(PROPS_KEY_IMPL_CLASS, DEFAULT_IMPL_CLASS);
ReferentManager.init((IReferentResolver) Class.forName(implClass).newInstance(), props);
}
} catch (final IOException e) {
throw new ResolverException("Error attempting to open props file from classpath, disabling " + SVC_ID +
" : " + e.getMessage());
} catch (final Exception e) {
throw new ResolverException("Unable to inititalize implementation: " + props.getProperty(implClass) +
" - " + e.getMessage());
}
}
/**
* Returns the OpenURL service identifier for this implementation of info.openurl.oom.Service
*/
@Override
public URI getServiceID() throws URISyntaxException {
return new URI(SVC_ID);
}
/**
* Returns the OpenURLResponse of a JSON object defining image status. Status Codes:
*/
@Override
public OpenURLResponse resolve(final ServiceType serviceType, final ContextObject contextObject,
final OpenURLRequest openURLRequest, final OpenURLRequestProcessor processor) {
final String responseFormat = RESPONSE_TYPE;
int status = HttpServletResponse.SC_NOT_FOUND;
byte[] bytes = new byte[] {};
try {
final String id = ((URI) contextObject.getReferent().getDescriptors()[0]).toASCIIString();
status = ReferentManager.getResolver().getStatus(id);
if (status != HttpServletResponse.SC_NOT_FOUND) {
final ObjectMapper mapper = new ObjectMapper();
final ObjectNode rootNode = mapper.createObjectNode();
String res_status = null;
if (status == HttpServletResponse.SC_OK) {
res_status = STATUS_OK;
} else if (status == HttpServletResponse.SC_ACCEPTED) {
res_status = STATUS_ACCEPTED;
}
rootNode.put("identifier", id);
rootNode.put("status", res_status);
bytes = mapper.writeValueAsBytes(rootNode);
}
} catch (final Exception e) {
LOGGER.error(e.getMessage(), e);
status = HttpServletResponse.SC_INTERNAL_SERVER_ERROR;
}
final HashMap<String, String> header_map = new HashMap<String, String>();
header_map.put("Content-Length", Integer.toString(bytes.length));
header_map.put("Date", HttpDate.getHttpDate());
return new OpenURLResponse(status, responseFormat, bytes, header_map);
}
}