/**
* Copyright 2014 Martynas Jusevičius <martynas@graphity.org>
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
package org.graphity.server.provider;
import com.hp.hpl.jena.sparql.engine.http.Service;
import com.sun.jersey.core.spi.component.ComponentContext;
import com.sun.jersey.spi.inject.Injectable;
import com.sun.jersey.spi.inject.PerRequestTypeInjectableProvider;
import javax.naming.ConfigurationException;
import javax.servlet.ServletContext;
import javax.ws.rs.WebApplicationException;
import javax.ws.rs.core.Context;
import javax.ws.rs.core.Response;
import javax.ws.rs.ext.ContextResolver;
import javax.ws.rs.ext.Provider;
import javax.ws.rs.ext.Providers;
import org.graphity.server.model.SPARQLEndpointOrigin;
import org.graphity.server.model.impl.SPARQLEndpointOriginBase;
import org.graphity.server.util.DataManager;
import org.graphity.server.vocabulary.SD;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* JAX-RS provider for SPARQL endpoint origin.
* Needs to be registered in the application.
*
* @author Martynas Jusevičius <martynas@graphity.org>
* @see org.graphity.server.model.SPARQLEndpointOrigin
*/
@Provider
public class SPARQLEndpointOriginProvider extends PerRequestTypeInjectableProvider<Context, SPARQLEndpointOrigin> implements ContextResolver<SPARQLEndpointOrigin>
{
private static final Logger log = LoggerFactory.getLogger(SPARQLEndpointOriginProvider.class);
@Context ServletContext servletContext;
@Context Providers providers;
public SPARQLEndpointOriginProvider()
{
super(SPARQLEndpointOrigin.class);
}
public ServletContext getServletContext()
{
return servletContext;
}
public Providers getProviders()
{
return providers;
}
public DataManager getDataManager()
{
ContextResolver<DataManager> cr = getProviders().getContextResolver(DataManager.class, null);
return cr.getContext(DataManager.class);
}
@Override
public Injectable<SPARQLEndpointOrigin> getInjectable(ComponentContext cc, Context context)
{
return new Injectable<SPARQLEndpointOrigin>()
{
@Override
public SPARQLEndpointOrigin getValue()
{
return getSPARQLEndpointOrigin();
}
};
}
@Override
public SPARQLEndpointOrigin getContext(Class<?> type)
{
return getSPARQLEndpointOrigin();
}
/**
* Returns configured SPARQL endpoint origin.
* Uses <code>sd:endpoint</code> context parameter value as endpoint URI.
*
* @return configured origin
*/
public SPARQLEndpointOrigin getSPARQLEndpointOrigin()
{
return getSPARQLEndpointOrigin(getServletContext(), SD.endpoint.getURI());
}
/**
* Returns SPARQL endpoint origin for supplied webapp context configuration.
*
* @param servletContext context config
* @param property configuration property string
* @return endpoint origin
*/
public SPARQLEndpointOrigin getSPARQLEndpointOrigin(ServletContext servletContext, String property)
{
if (servletContext == null) throw new IllegalArgumentException("ServletContext cannot be null");
if (property == null) throw new IllegalArgumentException("Property cannot be null");
try
{
Object endpointUri = servletContext.getInitParameter(property);
if (endpointUri == null) throw new ConfigurationException("SPARQL endpoint not configured ('" + property + "' not set in web.xml)");
String authUser = (String)servletContext.getInitParameter(Service.queryAuthUser.getSymbol());
String authPwd = (String)servletContext.getInitParameter(Service.queryAuthPwd.getSymbol());
if (authUser != null && authPwd != null)
getDataManager().putAuthContext(endpointUri.toString(), authUser, authPwd);
return new SPARQLEndpointOriginBase(endpointUri.toString());
}
catch (ConfigurationException ex)
{
if (log.isErrorEnabled()) log.warn("SPARQL endpoint configuration error", ex);
throw new WebApplicationException(ex, Response.Status.INTERNAL_SERVER_ERROR);
}
}
}