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/*
* HttpHandler.java
* ---------------------
*
* Part of the URY Server Platform
*
* V0.00 2011/03/20
*
* (C) 2011 URY Computing
*
* Based on the HttpCore example code, which is available under the
* Apache License, version 2.0; the copyright notice provided with
* said code follows.
*
* ====================================================================
* 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.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
*/
package uk.org.ury.backend.server;
import java.io.UnsupportedEncodingException;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.Map;
import org.apache.http.HttpRequest;
import org.apache.http.HttpResponse;
import org.apache.http.HttpStatus;
import org.apache.http.entity.StringEntity;
import org.apache.http.protocol.HTTP;
import org.apache.http.protocol.HttpContext;
import org.apache.http.protocol.HttpRequestHandler;
import uk.org.ury.backend.server.exceptions.BadRequestException;
import uk.org.ury.backend.server.exceptions.HandleFailureException;
import uk.org.ury.backend.server.exceptions.HandlerNotFoundException;
import uk.org.ury.backend.server.exceptions.HandlerSetupFailureException;
import uk.org.ury.backend.server.exceptions.NotAHandlerException;
import uk.org.ury.common.protocol.Directive;
import uk.org.ury.common.protocol.ProtocolUtils;
import uk.org.ury.common.protocol.Status;
import uk.org.ury.common.protocol.exceptions.EncodeFailureException;
/**
* @author Matt Windsor, Apache Software Foundation
*/
public class HttpHandler extends AbstractRequestHandler implements
HttpRequestHandler {
/**
* Construct a new HttpHandler.
*
* @param server
* The instance of the URY server responsible for the request.
*
* @param mount
* The directory to which this handler is to be mounted.
*/
public HttpHandler(Server server, String mount) {
super(server, mount);
}
/**
* Handle a HTTP GET request.
*
* @param request
* The HTTP request.
*
* @param response
* The response that the handler will populate during the
* handling of the request.
*
* @param context
* The HTTP context.
*
* @throws HandlerNotFoundException
* if the client requested a request handler that could not be
* found on the class path.
*
* @throws HandlerSetupFailureException
* if the handler was found but could not be set up (eg does not
* implement appropriate interface or cannot be instantiated).
*
* @throws HandleFailureException
* if an appropriate handler was contacted, but it failed to
* process the request.
*
* @throws BadRequestException
* if the request was malformed or invalid.
*
* @throws NotAHandlerException
* if the class requested to handle the request is not a
* handler.
*/
@Override
public void handleGet(HttpRequest request, HttpResponse response,
HttpContext context) throws HandlerNotFoundException,
HandlerSetupFailureException, HandleFailureException,
BadRequestException, NotAHandlerException {
String path = request.getRequestLine().getUri();
if (path.equals("/index.html") || path.equals("/")) {
// Someone's trying to get the index page!
// Humour them.
response.setStatusLine(request.getProtocolVersion(),
HttpStatus.SC_OK, "OK");
StringEntity entity = null;
try {
entity = new StringEntity(Server.DOCTYPE + Server.INDEX_HTML);
} catch (UnsupportedEncodingException e) {
throw new HandlerSetupFailureException("(Index page)", e);
}
entity.setContentType("text/html");
response.setEntity(entity);
} else {
// Convert this into a URL and fan out the various parts of it.
URL pathURL = null;
try {
pathURL = new URL("http://localhost" + path);
} catch (MalformedURLException e) {
throw new BadRequestException(e);
}
String className = "uk.org.ury"
+ pathURL.getPath().replace('/', '.');
System.out.println(className);
Class<?> newClass = null;
try {
newClass = Class.forName(className);
} catch (ClassNotFoundException e) {
throw new HandlerNotFoundException(className, e);
}
if (ApiRequestHandler.class.isAssignableFrom(newClass) == false)
throw new NotAHandlerException(className);
String queryString = pathURL.getQuery();
Map<String, String> parameters;
try {
parameters = parseQueryString(queryString);
} catch (UnsupportedEncodingException e) {
throw new HandlerSetupFailureException(className, e);
}
Map<String, Object> content = null;
try {
ApiRequestHandler srh = ((ApiRequestHandler) newClass
.newInstance());
content = srh.handleGetRequest(parameters, server);
} catch (InstantiationException e) {
throw new HandlerSetupFailureException(className, e);
} catch (IllegalAccessException e) {
throw new HandlerSetupFailureException(className, e);
}
// Everything seems OK, so make the response.
response.setStatusLine(request.getProtocolVersion(),
HttpStatus.SC_OK, "OK");
content.put(Directive.STATUS.toString(), Status.OK.toString());
StringEntity entity = null;
try {
entity = new StringEntity(ProtocolUtils.encode(content));
} catch (UnsupportedEncodingException e) {
throw new HandlerSetupFailureException(className, e);
} catch (EncodeFailureException e) {
throw new HandleFailureException(e);
}
entity.setContentType(HTTP.PLAIN_TEXT_TYPE);
response.setEntity(entity);
}
}
}
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