/*******************************************************************************
* Copyright (c) 2014, Institute for Pervasive Computing, ETH Zurich.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the Institute nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS "AS IS" AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* This file is part of the Californium (Cf) CoAP framework.
******************************************************************************/
package ch.ethz.inf.vs.californium.plugtests.resources;
import java.nio.ByteBuffer;
import static ch.ethz.inf.vs.californium.coap.CoAP.ResponseCode.*;
import static ch.ethz.inf.vs.californium.coap.MediaTypeRegistry.*;
import ch.ethz.inf.vs.californium.coap.Request;
import ch.ethz.inf.vs.californium.coap.Response;
import ch.ethz.inf.vs.californium.server.resources.CoapExchange;
import ch.ethz.inf.vs.californium.server.resources.ResourceBase;
/**
* This resource implements a test of specification for the ETSI IoT CoAP Plugtests, Las Vegas, NV, USA, 19 - 22 Nov 2013.
*
* @author Matthias Kovatsch
*/
public class Validate extends ResourceBase {
private byte[] data = null;
private int dataCf = TEXT_PLAIN;
private byte[] etag = {0,0,0,0};
public Validate() {
super("validate");
getAttributes().setTitle("Resource which varies");
}
@Override
public void handleGET(CoapExchange exchange) {
// get request to read out details
Request request = exchange.advanced().getRequest();
// successively create response
Response response;
if (exchange.getRequestOptions().containsETag(etag)) {
response = new Response(VALID);
response.getOptions().addETag(etag.clone());
// automatically change now
storeData(null, UNDEFINED);
} else {
response = new Response(CONTENT);
if (data==null) {
etag = ByteBuffer.allocate(2).putShort( (short) (Math.random()*0x10000) ).array();
StringBuilder payload = new StringBuilder();
payload.append(
String.format(
"Type: %d (%s)\nCode: %d (%s)\nMID: %d",
request.getType().value,
request.getType(),
request.getCode().value,
request.getCode(),
request.getMID()));
if (request.getToken().length > 0) {
payload.append("\nToken: ");
payload.append(request.getTokenString());
}
if (payload.length() > 64) {
payload.delete(63, payload.length());
payload.append('»');
}
response.setPayload(payload.toString());
response.getOptions().setContentFormat(TEXT_PLAIN);
} else {
response.setPayload(data);
response.getOptions().setContentFormat(dataCf);
}
response.getOptions().addETag(etag.clone());
}
exchange.respond(response);
}
@Override
public void handlePUT(CoapExchange exchange) {
if (exchange.getRequestOptions().isIfMatch(etag)) {
if (exchange.getRequestOptions().hasContentFormat()) {
storeData(exchange.getRequestPayload(), exchange.getRequestOptions().getContentFormat());
exchange.setETag(etag.clone());
exchange.respond(CHANGED);
} else {
exchange.respond(BAD_REQUEST, "Content-Format not set");
}
} else if (exchange.getRequestOptions().hasIfNoneMatch() && data==null) {
storeData(exchange.getRequestPayload(), exchange.getRequestOptions().getContentFormat());
exchange.respond(CREATED);
} else {
exchange.respond(PRECONDITION_FAILED);
// automatically change now
storeData(null, UNDEFINED);
}
}
@Override
public void handleDELETE(CoapExchange exchange) {
storeData(null, UNDEFINED);
exchange.respond(DELETED);
}
// Internal ////////////////////////////////////////////////////////////////
/*
* Convenience function to store data contained in a
* PUT/POST-Request. Notifies observing endpoints about
* the change of its contents.
*/
private synchronized void storeData(byte[] payload, int cf) {
if (payload!=null) {
data = payload;
dataCf = cf;
etag = ByteBuffer.allocate(4).putInt( data.hashCode() ).array();
// set payload and content type
getAttributes().clearContentType();
getAttributes().addContentType(dataCf);
getAttributes().setMaximumSizeEstimate(data.length);
} else {
data = null;
etag = ByteBuffer.allocate(2).putShort( (short) (Math.random()*0x10000) ).array();
}
// signal that resource state changed
changed();
}
}