/**
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.apache.lucene.gdata.servlet.handler;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.lucene.gdata.data.GDataAccount;
import org.apache.lucene.gdata.data.ServerBaseFeed;
import org.apache.lucene.gdata.data.GDataAccount.AccountRole;
import org.apache.lucene.gdata.server.GDataEntityBuilder;
import org.apache.lucene.gdata.server.GDataResponse;
import org.apache.lucene.gdata.server.ServiceException;
import org.apache.lucene.gdata.server.ServiceFactory;
import org.apache.lucene.gdata.server.administration.AdminService;
import org.apache.lucene.gdata.server.registry.ComponentType;
import org.apache.lucene.gdata.server.registry.GDataServerRegistry;
import org.apache.lucene.gdata.server.registry.ProvidedService;
import com.google.gdata.util.ParseException;
/**
*
* @author Simon Willnauer
*
*/
public abstract class AbstractFeedHandler extends RequestAuthenticator implements GDataRequestHandler {
private static final Log LOG = LogFactory.getLog(AbstractFeedHandler.class);
protected static final String PARAMETER_ACCOUNT = "account";
protected static final String PARAMETER_SERVICE = "service";
private int error;
protected boolean authenticated = false;
private String errorMessage = "";
private boolean isError = false;
/**
* @see org.apache.lucene.gdata.servlet.handler.GDataRequestHandler#processRequest(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse)
*/
@SuppressWarnings("unused")
public void processRequest(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
this.authenticated = authenticateAccount(request,AccountRole.FEEDAMINISTRATOR);
if(!this.authenticated)
setError(GDataResponse.UNAUTHORIZED,"Authorization failed");
}
protected ServerBaseFeed createFeedFromRequest(HttpServletRequest request) throws ParseException, IOException, FeedHandlerException{
GDataServerRegistry registry = GDataServerRegistry.getRegistry();
String providedService = request.getParameter(PARAMETER_SERVICE);
if(!registry.isServiceRegistered(providedService)){
setError(GDataResponse.NOT_FOUND,"no such service");
throw new FeedHandlerException("ProvicdedService is not registered -- Name: "+providedService);
}
ProvidedService provServiceInstance = registry.getProvidedService(providedService);
if(providedService == null){
setError(GDataResponse.BAD_REQUEST,"no such service");
throw new FeedHandlerException("no such service registered -- "+providedService);
}
try{
ServerBaseFeed retVal = new ServerBaseFeed(GDataEntityBuilder.buildFeed(request.getReader(),provServiceInstance));
retVal.setServiceConfig(provServiceInstance);
return retVal;
}catch (IOException e) {
if(LOG.isInfoEnabled())
LOG.info("Can not read from input stream - ",e);
setError(GDataResponse.BAD_REQUEST,"Can not read from input stream");
throw e;
}catch (ParseException e) {
if(LOG.isInfoEnabled())
LOG.info("feed can not be parsed - ",e);
setError(GDataResponse.BAD_REQUEST,"incoming feed can not be parsed");
throw e;
}
}
protected GDataAccount createRequestedAccount(HttpServletRequest request) throws FeedHandlerException{
GDataServerRegistry registry = GDataServerRegistry.getRegistry();
ServiceFactory serviceFactory = registry.lookup(ServiceFactory.class,ComponentType.SERVICEFACTORY);
if(serviceFactory == null){
setError(GDataResponse.SERVER_ERROR, "Required server component not available");
throw new FeedHandlerException("Required server component not available -- "+ServiceFactory.class.getName());
}
AdminService service = serviceFactory.getAdminService();
String account = request.getParameter(PARAMETER_ACCOUNT);
try{
return service.getAccount(account);
}catch (ServiceException e) {
if(LOG.isInfoEnabled())
LOG.info("no account for requested account - "+account,e);
setError(HttpServletResponse.SC_BAD_REQUEST,"no such account");
throw new FeedHandlerException(e.getMessage(),e);
}
}
protected void sendResponse(HttpServletResponse response){
if(!this.isError)
return;
try{
response.sendError(this.error,this.errorMessage);
}catch (IOException e) {
LOG.warn("can send error in RequestHandler ",e);
}
}
protected void setError(int error, String message){
this.error = error;
this.errorMessage = message;
this.isError = true;
}
protected int getErrorCode(){
return this.error;
}
protected String getErrorMessage(){
return this.errorMessage;
}
static class FeedHandlerException extends Exception{
/**
*
*/
private static final long serialVersionUID = 1L;
/**
* Creates a new FeedHandlerException with a exception message and the exception cause this ex.
* @param arg0 - the message
* @param arg1 - the cause
*/
public FeedHandlerException(String arg0, Throwable arg1) {
super(arg0, arg1);
}
/**
* Creates a new FeedHandlerException with a exception message.
* @param arg0 - message
*/
public FeedHandlerException(String arg0) {
super(arg0 );
}
}
}
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