Make it possible to send the productName

With PSD2 banks now require registration of programs (rather than libraries)
with "Die Deutsche Kreditwirtschaft" on https://www.hbci-zka.de. You are given
a key that needs to be passed in the product name field for access to be
granted. Everyone can apply for this key for their program.

client/client.go

@@ -21,6 +21,7 @@ type Config struct {
  PIN string `json:"pin"`
  URL string `json:"url"`
  HBCIVersion int `json:"hbci_version"`
+ ProductName string `json:"product_name"`
  Transport transport.Transport
 }
 
@@ -71,6 +72,7 @@ func New(config Config) (*Client, error) {
  HBCIURL: url,
  UserID: config.AccountID,
  HBCIVersion: hbciVersion,
+ ProductName: config.ProductName,
  Transport: config.Transport,
  }
 

dialog/dialog.go

@@ -34,6 +34,7 @@ func newDialog(
  hbciURL string,
  userID string,
  hbciVersion segment.HBCIVersion,
+ productName string,
  signatureProvider message.SignatureProvider,
  cryptoProvider message.CryptoProvider,
 ) *dialog {
@@ -49,6 +50,7 @@ func newDialog(
  cryptoProvider: cryptoProvider,
  dialogID: initialDialogID,
  hbciVersion: hbciVersion,
+ productName: productName,
  }
 }
 
@@ -69,6 +71,7 @@ type dialog struct {
  cryptoProvider message.CryptoProvider
  BankParameterData domain.BankParameterData
  hbciVersion segment.HBCIVersion
+ productName string
  supportedSegments []segment.VersionedSegment
 }
 
@@ -134,7 +137,7 @@ func (d *dialog) SendMessage(clientMessage message.HBCIMessage) (message.BankMes
 func (d *dialog) SyncClientSystemID() (string, error) {
  syncMessage := message.NewSynchronisationMessage(d.hbciVersion)
  syncMessage.Identification = segment.NewIdentificationSegment(d.BankID, d.clientID, initialClientSystemID, true)
- syncMessage.ProcessingPreparation = segment.NewProcessingPreparationSegment(0, 0, 1)
+ syncMessage.ProcessingPreparation = segment.NewProcessingPreparationSegment(0, 0, 1, d.productName)
  syncMessage.Sync = d.hbciVersion.SynchronisationRequest(segment.SyncModeAquireClientID)
  syncMessage.BasicMessage = d.newBasicMessage(syncMessage)
  signedSyncMessage, err := syncMessage.Sign(d.signatureProvider)
@@ -233,7 +236,7 @@ func (d *dialog) anonymousInit() error {
  d.messageCount = 0
  initMessage := message.NewDialogInitializationClientMessage(d.hbciVersion)
  initMessage.Identification = segment.NewIdentificationSegment(d.BankID, anonymousClientID, initialClientSystemID, false)
- initMessage.ProcessingPreparation = segment.NewProcessingPreparationSegment(d.BankParameterDataVersion(), d.UserParameterDataVersion(), d.Language)
+ initMessage.ProcessingPreparation = segment.NewProcessingPreparationSegment(d.BankParameterDataVersion(), d.UserParameterDataVersion(), d.Language, d.productName)
  initMessage.BasicMessage = d.newBasicMessage(initMessage)
  initMessage.SetNumbers()
  bankMessage, err := d.request(initMessage)
@@ -314,7 +317,7 @@ func (d *dialog) init() error {
  d.messageCount = 0
  initMessage := message.NewDialogInitializationClientMessage(d.hbciVersion)
  initMessage.Identification = segment.NewIdentificationSegment(d.BankID, d.clientID, d.ClientSystemID, true)
- initMessage.ProcessingPreparation = segment.NewProcessingPreparationSegment(d.BankParameterDataVersion(), d.UserParameterDataVersion(), d.Language)
+ initMessage.ProcessingPreparation = segment.NewProcessingPreparationSegment(d.BankParameterDataVersion(), d.UserParameterDataVersion(), d.Language, d.productName)
  initMessage.BasicMessage = d.newBasicMessage(initMessage)
  signedInitMessage, err := initMessage.Sign(d.signatureProvider)
  if err != nil {

dialog/pin_tan_dialog.go

@@ -18,6 +18,7 @@ type Config struct {
  HBCIURL string
  UserID string
  HBCIVersion segment.HBCIVersion
+ ProductName string
  Transport transport.Transport
 }
 
@@ -33,6 +34,7 @@ func NewPinTanDialog(config Config) *PinTanDialog {
  config.HBCIURL,
  config.UserID,
  config.HBCIVersion,
+ config.ProductName,
  signatureProvider,
  cryptoProvider,
  ),

dialog/rdh_dialog.go

@@ -7,15 +7,15 @@ import (
 )
 
 // NewRDHDialog creates a dialog to use with cardreader flow
-func NewRDHDialog(bankID domain.BankID, hbciURL string, clientID string, hbciVersion segment.HBCIVersion) Dialog {
+func NewRDHDialog(bankID domain.BankID, hbciURL string, clientID string, hbciVersion segment.HBCIVersion, productName string) Dialog {
  key, err := domain.GenerateSigningKey()
  if err != nil {
  panic(err)
  }
  signingKey := domain.NewRSAKey(key, domain.NewInitialKeyName(bankID.CountryCode, bankID.ID, clientID, "S"))
  provider := message.NewRDHSignatureProvider(signingKey, 12345)
  d := &rdhDialog{
- dialog: newDialog(bankID, hbciURL, clientID, hbciVersion, provider, nil),
+ dialog: newDialog(bankID, hbciURL, clientID, hbciVersion, productName, provider, nil),
  }
  return d
 }

segment/dialog.go

@@ -6,8 +6,8 @@ import (
  "github.com/mitch000001/go-hbci/element"
 )
 
-const productName = "go-hbci library"
-const productVersion = hbci.Version
+const defaultProductName = "go-hbci library"
+const defaultProductVersion = hbci.Version
 
 func NewDialogEndSegment(dialogId string) *DialogEndSegment {
  d := &DialogEndSegment{
@@ -33,13 +33,16 @@ func (d *DialogEndSegment) elements() []element.DataElement {
  }
 }
 
-func NewProcessingPreparationSegment(bdpVersion int, udpVersion int, language domain.Language) *ProcessingPreparationSegment {
+func NewProcessingPreparationSegment(bdpVersion int, udpVersion int, language domain.Language, productName string) *ProcessingPreparationSegment {
+ if productName == "" {
+ productName = defaultProductName
+ }
  p := &ProcessingPreparationSegment{
  BPDVersion: element.NewNumber(bdpVersion, 3),
  UPDVersion: element.NewNumber(udpVersion, 3),
  DialogLanguage: element.NewNumber(int(language), 3),
  ProductName: element.NewAlphaNumeric(productName, 25),
- ProductVersion: element.NewAlphaNumeric(productVersion, 5),
+ ProductVersion: element.NewAlphaNumeric(defaultProductVersion, 5),
  }
  p.ClientSegment = NewBasicSegment(4, p)
  return p