@Override
protected void handle(DatagramPacket datagramPacket) throws SignatureException {
KeyManager keyManager = KeyManager.getInstance();
RSAPublicKey clientPubKey = (RSAPublicKey) keyManager.getPublicKey(Key.CLIENT);
byte[] reqBytes = Arrays.copyOf(datagramPacket.getData(), datagramPacket.getLength());
Request req = new Request(new String(reqBytes), clientPubKey);
String chainHash = null;
LOCK.lock();
try {
String itemId = req.getItemId().toString();
System.out.format(
"received: itemId=%2d, userId=%s, price=%s\n",
req.getItemId(), req.getUserId(), req.getPrice());
chainHash = HASHING_CHAIN_TABLE.getLastChainHash(itemId);
HASHING_CHAIN_TABLE.chain(itemId, Utils.digest(req.toString()));
} finally {
LOCK.unlock();
}
int currentPrice = PRICE_TABLE.getOrDefault(req.getItemId(), 0);
int bidderPrice = Integer.decode(req.getPrice());
boolean bidSuccess = bidderPrice > currentPrice;
if (bidSuccess) {
PRICE_TABLE.put(req.getItemId(), bidderPrice);
}
System.out.format(
"decrypted price: %d, now highest price is %d\n",
bidderPrice, Math.max(bidderPrice, currentPrice));
Acknowledgement ack = new Acknowledgement(chainHash, bidSuccess, req);
ack.sign(keyPair, keyInfo);
try (Socket s = new Socket(datagramPacket.getAddress(), req.getPort());
DataOutputStream out = new DataOutputStream(s.getOutputStream());
DataInputStream in = new DataInputStream(s.getInputStream())) {
Utils.send(out, ack.toString());
} catch (IOException ex) {
LOGGER.log(Level.SEVERE, null, ex);
}
}
