/**
* Generates a Payment message based on the information in the PaymentRequest. Provide
* transactions built by the wallet. If the PaymentRequest did not specify a payment_url, returns
* null.
*
* @param txns list of transactions to be included with the Payment message.
* @param refundAddr will be used by the merchant to send money back if there was a problem.
* @param memo is a message to include in the payment message sent to the merchant.
*/
@Nullable
public Protos.Payment getPayment(
List<Transaction> txns, @Nullable Address refundAddr, @Nullable String memo)
throws IOException, PaymentProtocolException.InvalidNetwork {
if (paymentDetails.hasPaymentUrl()) {
for (Transaction tx : txns)
if (!tx.getParams().equals(params))
throw new PaymentProtocolException.InvalidNetwork(params.getPaymentProtocolId());
return PaymentProtocol.createPaymentMessage(
txns, totalValue, refundAddr, memo, getMerchantData());
} else {
return null;
}
}
/**
* Creates a PaymentSession from the provided {@link Protos.PaymentRequest}. If verifyPki is true,
* also validates the signature and throws an exception if it fails. If trustStoreLoader is null,
* the system default trust store is used.
*/
public PaymentSession(
Protos.PaymentRequest request,
boolean verifyPki,
@Nullable final TrustStoreLoader trustStoreLoader)
throws PaymentProtocolException {
TrustStoreLoader nonNullTrustStoreLoader =
trustStoreLoader != null
? trustStoreLoader
: new TrustStoreLoader.DefaultTrustStoreLoader();
parsePaymentRequest(request);
if (verifyPki) {
try {
pkiVerificationData =
PaymentProtocol.verifyPaymentRequestPki(request, nonNullTrustStoreLoader.getKeyStore());
} catch (IOException x) {
throw new PaymentProtocolException(x);
} catch (KeyStoreException x) {
throw new PaymentProtocolException(x);
}
} else {
pkiVerificationData = null;
}
}
@Override
public Boolean call() {
if (serverSocket.isClosed()) {
log.warn("Server socket is closed. Aborting.");
return false;
} else {
try {
// Wait for a client connection
log.debug("Await client connection to SSLSocket");
SSLSocket socket = (SSLSocket) serverSocket.accept();
socket.startHandshake();
log.debug("Sending PaymentACK");
InputStream inputStream = socket.getInputStream();
OutputStream outputStream = socket.getOutputStream();
// Read the inputStream - this is expected to be a header followed by a serialised Payment
Reader reader = new InputStreamReader(inputStream);
BufferedReader bufferedReader = new BufferedReader(reader);
String line;
int contentLength = -1;
StringBuilder builder = new StringBuilder();
while (!"".equals((line = bufferedReader.readLine()))) {
builder.append(line).append("\n");
log.debug("Read line: {}", line);
if (line.startsWith("Content-Length")) {
String[] tokens = line.replaceAll(" ", "").split(":");
if (tokens.length >= 2) {
contentLength = Integer.parseInt(tokens[1]);
}
}
}
log.debug("Calculated contentLength: {}", contentLength);
log.debug("Read the header:\n{}\n", builder.toString());
// Get the Content-Length and read those - this is expected to be the serialised Payment
if (contentLength > -1) {
byte buffer[] = new byte[contentLength];
for (int i = 0; i < contentLength; i++) {
buffer[i] = (byte) inputStream.read();
}
log.debug("Read:\n", HexUtils.toHexBytes(buffer));
try {
Protos.Payment payment = Protos.Payment.parseFrom(buffer);
log.debug("Successfully parsed a payment {}", payment);
// Create a PaymentACK for the payment
Protos.PaymentACK paymentAck =
PaymentProtocol.createPaymentAck(payment, "You sent: '" + payment.getMemo() + "'");
log.debug("Sending paymentACK as a response: {}", paymentAck);
// Write the HTTP header
outputStream.write("HTTP/1.0 200 OK\n".getBytes(Charsets.UTF_8));
outputStream.write("Content-Type: ".getBytes(Charsets.UTF_8));
outputStream.write(contentType.getBytes(Charsets.UTF_8));
outputStream.write("\n\n".getBytes(Charsets.UTF_8));
// Write the protobuf response
paymentAck.writeTo(outputStream);
// ByteArrayInputStream responseInputStream = new ByteArrayInputStream(paymentAckBytes);
// ByteStreams.copy(responseInputStream, outputStream);
} catch (com.google.protobuf.InvalidProtocolBufferException ipbe) {
log.error("Was expecting a Payment on the socket but saw something else");
ipbe.printStackTrace();
} catch (Exception e) {
e.printStackTrace();
} finally {
// Release resources
log.debug("Flush then close client socket...");
socket.getOutputStream().flush();
socket.close();
}
} else {
log.debug("Could not find a Content-Length in the header so not reading payment");
}
return true;
} catch (IOException e) {
throw new IllegalStateException("Unexpected IOException", e);
}
}
}
public static PaymentIntent parsePaymentRequest(@Nonnull final byte[] serializedPaymentRequest)
throws PaymentProtocolException {
try {
if (serializedPaymentRequest.length > 50000)
throw new PaymentProtocolException(
"payment request too big: " + serializedPaymentRequest.length);
final Protos.PaymentRequest paymentRequest =
Protos.PaymentRequest.parseFrom(serializedPaymentRequest);
final String pkiName;
final String pkiCaName;
if (!"none".equals(paymentRequest.getPkiType())) {
final KeyStore keystore = new TrustStoreLoader.DefaultTrustStoreLoader().getKeyStore();
final PkiVerificationData verificationData =
PaymentProtocol.verifyPaymentRequestPki(paymentRequest, keystore);
pkiName = verificationData.displayName;
pkiCaName = verificationData.rootAuthorityName;
} else {
pkiName = null;
pkiCaName = null;
}
final PaymentSession paymentSession = PaymentProtocol.parsePaymentRequest(paymentRequest);
if (paymentSession.isExpired())
throw new PaymentProtocolException.Expired(
"payment details expired: current time "
+ new Date()
+ " after expiry time "
+ paymentSession.getExpires());
if (!paymentSession.getNetworkParameters().equals(Constants.NETWORK_PARAMETERS))
throw new PaymentProtocolException.InvalidNetwork(
"cannot handle payment request network: " + paymentSession.getNetworkParameters());
final ArrayList<PaymentIntent.Output> outputs = new ArrayList<PaymentIntent.Output>(1);
for (final PaymentProtocol.Output output : paymentSession.getOutputs())
outputs.add(PaymentIntent.Output.valueOf(output));
final String memo = paymentSession.getMemo();
final String paymentUrl = paymentSession.getPaymentUrl();
final byte[] merchantData = paymentSession.getMerchantData();
final byte[] paymentRequestHash =
Hashing.sha256().hashBytes(serializedPaymentRequest).asBytes();
final PaymentIntent paymentIntent =
new PaymentIntent(
PaymentIntent.Standard.BIP70,
pkiName,
pkiCaName,
outputs.toArray(new PaymentIntent.Output[0]),
memo,
paymentUrl,
merchantData,
null,
paymentRequestHash);
if (paymentIntent.hasPaymentUrl() && !paymentIntent.isSupportedPaymentUrl())
throw new PaymentProtocolException.InvalidPaymentURL(
"cannot handle payment url: " + paymentIntent.paymentUrl);
return paymentIntent;
} catch (final InvalidProtocolBufferException x) {
throw new PaymentProtocolException(x);
} catch (final UninitializedMessageException x) {
throw new PaymentProtocolException(x);
} catch (final FileNotFoundException x) {
throw new RuntimeException(x);
} catch (final KeyStoreException x) {
throw new RuntimeException(x);
}
}
