@Override
public void handleMessage(CoapMessage message) {
/* message MUST be a request */
if (message.isEmpty()) {
return;
}
if (!message.isRequest()) {
return;
// throw new IllegalStateException("Incomming server message is not a request");
}
BasicCoapRequest request = (BasicCoapRequest) message;
CoapChannel channel = request.getChannel();
/* TODO make this cast safe */
server.onRequest((CoapServerChannel) channel, request);
}
public boolean addBlock(CoapMessage msg, CoapBlockOption block) {
int blockPos = block.getBytePosition();
int blockLength = msg.getPayloadLength();
int bufSize = payload.size();
/*TODO: check if payload length = blocksize (except for the last block)*/
if (blockPos > bufSize) {
/* data is missing before this block */
return false;
} else if ((blockPos + blockLength) <= bufSize) {
/* data already received */
return false;
}
int offset = bufSize - blockPos;
payload.write(msg.getPayload(), offset, blockLength - offset);
if (block.isLast()) {
/* was this the last block */
finished = true;
}
return true;
}
@Override
public BasicCoapResponse createResponse(
CoapMessage request, CoapResponseCode responseCode, CoapMediaType contentType) {
BasicCoapResponse response;
if (request.getPacketType() == CoapPacketType.CON) {
response =
new BasicCoapResponse(
CoapPacketType.ACK, responseCode, request.getMessageID(), request.getToken());
} else if (request.getPacketType() == CoapPacketType.NON) {
response =
new BasicCoapResponse(
CoapPacketType.NON, responseCode, request.getMessageID(), request.getToken());
} else {
throw new IllegalStateException(
"Create Response failed, Request is neither a CON nor a NON packet");
}
if (contentType != null && contentType != CoapMediaType.UNKNOWN) {
response.setContentType(contentType);
}
response.setChannel(this);
return response;
}
public void handleMessage(CoapMessage message) {
if (message.isRequest()) {
/* this is a client channel, no requests allowed */
message
.getChannel()
.sendMessage(new CoapEmptyMessage(CoapPacketType.RST, message.getMessageID()));
return;
}
if (message.isEmpty() && message.getPacketType() == CoapPacketType.ACK) {
/* this is the ACK of a separate response */
// TODO: implement a handler or listener, that informs a client when a sep. resp. ack was
// received
return;
}
if (message.getPacketType() == CoapPacketType.CON) {
/* this is a separate response */
/* send ACK */
this.sendMessage(new CoapEmptyMessage(CoapPacketType.ACK, message.getMessageID()));
}
/* check for blockwise transfer */
CoapBlockOption block2 = message.getBlock2();
if (blockContext == null && block2 != null) {
/* initiate blockwise transfer */
blockContext = new ClientBlockContext(block2, maxReceiveBlocksize);
blockContext.setFirstRequest(lastRequest);
blockContext.setFirstResponse((CoapResponse) message);
}
if (blockContext != null) {
/*blocking option*/
if (!blockContext.addBlock(message, block2)) {
/*this was not a correct block*/
/* TODO: implement either a RST or ignore this packet */
}
if (!blockContext.isFinished()) {
/* TODO: implement a counter to avoid an infinity req/resp loop:
* if the same block is received more than x times -> rst the connection
* implement maxPayloadSize to avoid an infinity payload */
CoapBlockOption newBlock = blockContext.getNextBlock();
if (lastRequest == null) {
/*TODO: this should never happen*/
System.out.println("ERROR: client channel: lastRequest == null");
} else {
/* create a new request for the next block */
BasicCoapRequest request =
new BasicCoapRequest(
lastRequest.getPacketType(),
lastRequest.getRequestCode(),
channelManager.getNewMessageID());
request.copyHeaderOptions((BasicCoapRequest) blockContext.getFirstRequest());
request.setBlock2(newBlock);
sendMessage(request);
}
/* TODO: implement handler, inform the client that a block (but not the complete message) was received*/
return;
}
/* blockwise transfer finished */
message.setPayload(blockContext.getPayload());
/* TODO: give the payload separately and leave the original message as they is*/
}
/* normal or separate response */
client.onResponse(this, (BasicCoapResponse) message);
}
@Override
public void onRequest(CoapServerChannel channel, CoapRequest request) {
CoapMessage response = null;
CoapRequestCode requestCode = request.getRequestCode();
String targetPath = request.getUriPath();
// TODO make this cast safe (send internal server error if it is not a CoapResource)
CoapResource resource = (CoapResource) readResource(targetPath);
/* TODO: check return values of create, read, update and delete
* TODO: implement forbidden
* TODO: implement ETag
* TODO: implement If-Match...
* TODO: check for well known addresses (do not override well known core)
* TODO: check that path begins with "/" */
switch (requestCode) {
case GET:
if (resource != null) {
// URI queries
Vector<String> uriQueries = request.getUriQuery();
final byte[] responseValue;
if (uriQueries != null) {
responseValue = resource.getValue(uriQueries);
} else {
responseValue = resource.getValue();
}
response =
channel.createResponse(
request, CoapResponseCode.Content_205, resource.getCoapMediaType());
response.setPayload(responseValue);
if (request.getObserveOption() != null) {
/*client wants to observe this resource*/
if (resource.addObserver(request)) {
/* successfully added observer */
response.setObserveOption(resource.getObserveSequenceNumber());
}
}
} else {
response = channel.createResponse(request, CoapResponseCode.Not_Found_404);
}
break;
case DELETE:
/* CoAP: "A 2.02 (Deleted) response SHOULD be sent on
success or in case the resource did not exist before the request.*/
deleteResource(targetPath);
response = channel.createResponse(request, CoapResponseCode.Deleted_202);
break;
case POST:
if (resource != null) {
resource.post(request.getPayload());
response = channel.createResponse(request, CoapResponseCode.Changed_204);
} else {
/* if the resource does not exist, a new resource will be created */
createResource(parseRequest(request));
response = channel.createResponse(request, CoapResponseCode.Created_201);
}
break;
case PUT:
if (resource == null) {
/* create*/
createResource(parseRequest(request));
response = channel.createResponse(request, CoapResponseCode.Created_201);
} else {
/*update*/
updateResource(parseRequest(request));
response = channel.createResponse(request, CoapResponseCode.Changed_204);
}
break;
default:
response = channel.createResponse(request, CoapResponseCode.Bad_Request_400);
break;
}
channel.sendMessage(response);
}
