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