public DEPExportFormat exportDEP() {
try {
// prepare data structures for DEP export
// DEP exports are grouped according to the used signature certificate (CURRENTLY NOT USED IN
// THE DEMO)
HashMap<String, List<ReceiptPackage>> certificateToReceiptMap = new HashMap<>();
for (ReceiptPackage receiptPackage : receiptPackages) {
X509Certificate signingCertificate = receiptPackage.getSigningCertificate();
List<ReceiptPackage> receiptPackagesForSignatureCertificate =
certificateToReceiptMap.get(signingCertificate.getSerialNumber() + "");
if (receiptPackagesForSignatureCertificate == null) {
receiptPackagesForSignatureCertificate = new ArrayList<>();
certificateToReceiptMap.put(
signingCertificate.getSerialNumber() + "", receiptPackagesForSignatureCertificate);
}
receiptPackagesForSignatureCertificate.add(receiptPackage);
}
// create data structure for export format
DEPExportFormat depExportFormat = new DEPExportFormat();
DEPBelegDump[] belegDump = new DEPBelegDump[certificateToReceiptMap.keySet().size()];
// store receipts in export format
int dumpIndex = 0;
for (List<ReceiptPackage> signedReceipts : certificateToReceiptMap.values()) {
belegDump[dumpIndex] = new DEPBelegDump();
depExportFormat.setBelegPackage(belegDump);
List<String> receiptsInJWSCompactRepresentation = new ArrayList<>();
for (ReceiptPackage receiptPackage : signedReceipts) {
receiptsInJWSCompactRepresentation.add(receiptPackage.getJwsCompactRepresentation());
}
belegDump[dumpIndex].setBelegeDaten(
receiptsInJWSCompactRepresentation.toArray(
new String[receiptsInJWSCompactRepresentation.size()]));
String base64EncodedSignatureCertificate =
CashBoxUtils.base64Encode(
signedReceipts.get(0).getSigningCertificate().getEncoded(), false);
belegDump[dumpIndex].setSignatureCertificate(base64EncodedSignatureCertificate);
List<X509Certificate> base64EncodedCertificateChain =
signedReceipts.get(0).getCertificateChain();
String[] certificateChain = new String[base64EncodedCertificateChain.size()];
for (int i = 0; i < base64EncodedCertificateChain.size(); i++) {
X509Certificate base64EncodedChainCertificate = base64EncodedCertificateChain.get(i);
certificateChain[i] =
CashBoxUtils.base64Encode(base64EncodedChainCertificate.getEncoded(), false);
}
belegDump[dumpIndex].setCertificateChain(certificateChain);
dumpIndex++;
}
return depExportFormat;
} catch (CertificateEncodingException e) {
e.printStackTrace();
}
return null;
}
public static void main(String[] args) {
try {
// IMPORTANT HINT REGARDING STRING ENCODING
// in Java all Strings have UTF-8 as default encoding
// therefore: there are only a few references to UTF-8 encoding in this demo code
// however, if values are retrieved from a database or another program language is used, then
// one needs to
// make sure that the UTF-8 encoding is correctly implemented
// create CMD line option object
Options options = new Options();
// add CMD line options
options.addOption(
"o",
"output-dir",
true,
"specify base output directory, if none is specified a new directory will be created in the current path");
options.addOption(
"n",
"number-of-generated-receipts",
true,
"specify number of receipts to be randomly generated, 50 is default");
options.addOption(
"g",
"signature-creation-device-cannot-fail",
false,
"deactivate glitches in signature-creation-device");
options.addOption(
"s",
"no-signature-certificate-switch",
false,
"deactivate switching of signature certificates after 5 receipts");
options.addOption(
"t", "no-training-receipts", false, "deactivate random generation of training-receipts");
/// parse CMD line options
CommandLineParser parser = new DefaultParser();
CommandLine cmd = parser.parse(options, args);
boolean signatureCreationDeviceAlwaysWorks = cmd.hasOption("g");
boolean deactivateSignatureCertificateSwitching = cmd.hasOption("s");
boolean deactivateTrainingReceipts = cmd.hasOption("t");
String outputParentDirectoryString = cmd.getOptionValue("o");
if (outputParentDirectoryString == null) {
DateFormat df = new SimpleDateFormat("yyyy-MM-dd'T'HH-mm-ss");
outputParentDirectoryString = "./CashBoxDemoOutput" + df.format(new Date());
}
File OUTPUT_PARENT_DIRECTORY = new File(outputParentDirectoryString);
OUTPUT_PARENT_DIRECTORY.mkdirs();
System.out.println("Setting workdir to " + OUTPUT_PARENT_DIRECTORY.getAbsolutePath());
String numberOfReceiptsString = cmd.getOptionValue("n");
int NUMBER_OF_RECEIPTS = DEFAULT_NUMBER_OF_GENERATED_RECEIPTS;
if (numberOfReceiptsString != null) {
NUMBER_OF_RECEIPTS = new Integer(numberOfReceiptsString);
}
// TODO add provider independent functionality
// initialise cryptographic providers
Security.addProvider(new BouncyCastleProvider());
// prepare cashbox init parameters
CashBoxParameters cashBoxParameters = new CashBoxParameters();
// set parameter for signature certificate switching
// if > 0 then switch signature certificate after so many signatures
// this is important for demonstrating the handling of the DEP export format
// when receipts where signed with multiple signature certificates
if (deactivateSignatureCertificateSwitching) {
cashBoxParameters.setChangeSignatureCertificateAfterSoManyReceipts(-1);
} else {
cashBoxParameters.setChangeSignatureCertificateAfterSoManyReceipts(10);
}
// generate and set random cash box ID ("Kassen-ID")
// REF TO SPECIFICATION: Detailspezifikation/Abs 4
String CASH_BOX_ID = "DEMO-CASH-BOX" + Math.round(Math.random() * 1000);
cashBoxParameters.setCashBoxID(CASH_BOX_ID);
// set cashbox suite
// REF TO SPECIFICATION: Detailspezifikation/Abs 2
// AT0 is used here for demonstration purposes, see Abs 2 for details on AT0
cashBoxParameters.setRkSuite(RKSuite.R1_AT0);
// set initial receipt identifier
// in this demo cashbox integer values are used as receipt identifiers ("Belegnummer"),
// however the specification does not
// impose that limit. An arbitrary UTF-8 String could be used, the only requirement is that
// the same combination of
// the cashBox ID ("Kassen-ID") and the receipt identifier ("Belegnummer") is NEVER used for
// more than one receipt
// using the same multiple times compromises the security of the encrypted turnover value,
// which might lead
// to leaked turnover data.
// REF TO SPECIFICATION: Detailspezifikation/Abs 4, Abs 8, Abs 9, Abs 10
long initialReceiptIdentifier = Math.round(Math.random() * 1000000);
cashBoxParameters.setInitialReceiptIdentifier(initialReceiptIdentifier);
// set DEP module for storing and exporting receipts
// REF TO SPECIFICATION: Detailspezifikation/Abs 3, 11
cashBoxParameters.setDepModul(new SimpleMemoryDEPModule());
// create random AES key for turnover encryption
// REF TO SPECIFICATION: Detailspezifikation/Abs 4, Abs 8, Abs 9, Abs 10
cashBoxParameters.setTurnoverKeyAESkey(CashBoxUtils.createAESKey());
// set up signature module
// the signature module is composed of an JWS module that create the JSON Web Signature (JWS)
// and
// a low level signature module for signing the hash values.
// REF TO SPECIFICATION: Detailspezifikation/Abs 2, Abs 4, Abs 5, Abs 6
// JWSModule jwsModule = new OrgBitbucketBcJwsModule(); //requires bouncycastle provider
JWSModule jwsModule = new ManualJWSModule(); // allows for provider independent use cases
// set damage flag, which simulates the failure of the signature creation device and the
// correct handling
// of this case, obviously this is only suitable for demonstration purposes
jwsModule.setDamageIsPossible(!signatureCreationDeviceAlwaysWorks);
jwsModule.setProbabilityOfDamagedSignatureDevice(PROPABILITY_DAMAGED_SIGNATURE_DEVICE);
jwsModule.setSignatureModule(new DO_NOT_USE_IN_REAL_CASHBOX_DemoSoftwareSignatureModule());
// jwsModule.setSignatureModule(new PKCS11SignatureModule());
cashBoxParameters.setJwsModule(jwsModule);
// set printer module
// REF TO SPECIFICATION: Detailspezifikation/Abs 12, Abs 13, Abs 14, Abs 15
PrinterModule printerModule = new SimplePDFPrinterModule();
cashBoxParameters.setPrinterModule(printerModule);
// init the cash box with the parameters
DemoCashBox demoCashBox = new DemoCashBox(cashBoxParameters);
// init done, start interaction with cashbox
// create random receipt data that will be handled by the cashbox
List<RawReceiptData> receipts =
RandomReceiptGenerator.generateRandomReceipts(NUMBER_OF_RECEIPTS);
// store first receipt (Startbeleg) in cashbox
// all taxtype values are set to zero (per default in this demo)
RawReceiptData firstReceipt = new RawReceiptData();
demoCashBox.storeReceipt(firstReceipt, false, false);
// now store the other receipts
for (RawReceiptData rawReceiptData : receipts) {
// store receipt within cashbox: (prepare data-to-be-signed, sign with JWS, store signed
// receipt in DEP)
// pre-defined chance for a training receipt (just for demo purposes)
boolean isTrainingReceipt = false;
if (Math.random() < PROPABILITY_TRAINING_RECEIPT && !deactivateTrainingReceipts) {
isTrainingReceipt = true;
}
// pre-defined chance for a storno receipt
boolean isStornoReceipt = false;
if (Math.random() < PROPABILITY_OF_STORNO_RECEIPT) {
isStornoReceipt = true;
}
demoCashBox.storeReceipt(rawReceiptData, isTrainingReceipt, isStornoReceipt);
}
// dump machine readable code of receipts (this "code" is used for the QR-codes)
// REF TO SPECIFICATION: Detailspezifikation/Abs 12
// dump to File
File qrCoreRepExportFile = new File(OUTPUT_PARENT_DIRECTORY, "qr-code-rep.txt");
List<ReceiptPackage> receiptPackages = demoCashBox.getStoredReceipts();
PrintWriter writer = new PrintWriter(new FileWriter(qrCoreRepExportFile));
System.out.println("------------QR-CODE-REP------------");
for (ReceiptPackage receiptPackage : receiptPackages) {
System.out.println(receiptPackage.getQRCodeRepresentation());
writer.println(receiptPackage.getQRCodeRepresentation());
}
System.out.println("");
writer.close();
// dump OCR code of receipts
// REF TO SPECIFICATION: Detailspezifikation/Abs 14
// dump to File
File ocrCoreRepExportFile = new File(OUTPUT_PARENT_DIRECTORY, "ocr-code-rep.txt");
writer = new PrintWriter(new FileWriter(ocrCoreRepExportFile));
System.out.println("------------OCR-CODE-REP------------");
for (ReceiptPackage receiptPackage : receiptPackages) {
System.out.println(receiptPackage.getOcrCodeRepresentation());
writer.println(receiptPackage.getOcrCodeRepresentation());
}
System.out.println("");
writer.close();
// export DEP from cashbox
// REF TO SPECIFICATION: Detailspezifikation/Abs 3
DEPExportFormat depExportFormat = demoCashBox.exportDEP();
// get JSON rep and dump export format to file/std output
Gson gson = new GsonBuilder().setPrettyPrinting().create();
String exportFormatJSONString = gson.toJson(depExportFormat);
System.out.println("------------DEP-EXPORT-FORMAT------------");
System.out.println(exportFormatJSONString);
System.out.println("");
// dump DEP export to file
File depExportFile = new File(OUTPUT_PARENT_DIRECTORY, "dep-export.txt");
FileOutputStream outputStream = new FileOutputStream(depExportFile);
outputStream.write(exportFormatJSONString.getBytes());
outputStream.close();
// export receipts as PDF (QR-CODE)
// REF TO SPECIFICATION: Detailspezifikation/Abs 12, Abs 13
File qrCodeDumpDirectory = new File(OUTPUT_PARENT_DIRECTORY, "qr-code-dir-pdf");
qrCodeDumpDirectory.mkdirs();
List<byte[]> printedQRCodeReceipts =
demoCashBox.printReceipt(receiptPackages, ReceiptPrintType.QR_CODE);
CashBoxUtils.writeReceiptsToFiles(printedQRCodeReceipts, "QR-", qrCodeDumpDirectory);
// export receipts as PDF (OCR)
// REF TO SPECIFICATION: Detailspezifikation/Abs 14, Abs 15
File ocrCodeDumpDirectory = new File(OUTPUT_PARENT_DIRECTORY, "ocr-code-dir-pdf");
ocrCodeDumpDirectory.mkdirs();
List<byte[]> printedOCRCodeReceipts =
demoCashBox.printReceipt(receiptPackages, ReceiptPrintType.OCR);
CashBoxUtils.writeReceiptsToFiles(printedOCRCodeReceipts, "OCR-", ocrCodeDumpDirectory);
// store signature certificates (so that they can be used for verification purposes)
// only for demonstration purposes
List<String> signatureCertificates = new ArrayList<>();
List<List<String>> certificateChains = new ArrayList<>();
DEPBelegDump[] belegDumps = depExportFormat.getBelegPackage();
for (DEPBelegDump depBelegDump : belegDumps) {
signatureCertificates.add(depBelegDump.getSignatureCertificate());
certificateChains.add(Arrays.asList(depBelegDump.getCertificateChain()));
}
File signatureCertificatesOutputFile =
new File(OUTPUT_PARENT_DIRECTORY, "signatureCertificates.txt");
String signatureCertificatesJSON = gson.toJson(signatureCertificates);
BufferedOutputStream bufferedOutputStream =
new BufferedOutputStream(new FileOutputStream(signatureCertificatesOutputFile));
ByteArrayInputStream bIn = new ByteArrayInputStream(signatureCertificatesJSON.getBytes());
IOUtils.copy(bIn, bufferedOutputStream);
bufferedOutputStream.close();
// store certificate chains (so that they can be used for verification purposes)
// only for demonstration purposes
File signatureCertificateChainsOutputFile =
new File(OUTPUT_PARENT_DIRECTORY, "signatureCertificateChains.txt");
String signatureCertificateChainsJSON = gson.toJson(certificateChains);
bufferedOutputStream =
new BufferedOutputStream(new FileOutputStream(signatureCertificateChainsOutputFile));
bIn = new ByteArrayInputStream(signatureCertificateChainsJSON.getBytes());
IOUtils.copy(bIn, bufferedOutputStream);
bufferedOutputStream.close();
// store AES key as BASE64 String (for demonstration purposes: to allow decryption of turnover
// value)
// ATTENTION, this is only for demonstration purposes, the AES key must be stored in a secure
// area
byte[] aesKey = cashBoxParameters.getTurnoverKeyAESkey().getEncoded();
String aesKeyBase64 = CashBoxUtils.base64Encode(aesKey, false);
writer = new PrintWriter(new File(OUTPUT_PARENT_DIRECTORY, "aesKeyBase64.txt"));
writer.print(aesKeyBase64);
writer.close();
} catch (IOException e) {
e.printStackTrace();
} catch (ParseException e) {
e.printStackTrace();
}
}