A lightweight ISO8583 (is an international standard for financial transaction card originated interchange messaging - wikipedia ) library for DotNet based on builder pattern and provide very simple use as you will see later.
Library is available in Nuget
To create an ISO message you must use ISOMessageBuilder which produce iso message for you:
ISOMessage isoMessage = ISOMessageBuilder.Packer(VERSION.V1987)
.NetworkManagement()
.MTI(MESSAGE_FUNCTION.Request, MESSAGE_ORIGIN.Acquirer)
.ProcessCode("930000")
.SetField(FIELDS.F11_STAN, "385629")
.SetField(FIELDS.F22_EntryMode, "1234")
.SetField(FIELDS.F24_NII_FunctionCode, "4321")
.SetField(FIELDS.F25_POS_ConditionCode, "12")
.SetField(FIELDS.F41_CA_TerminalID, "12345678")
.SetField(FIELDS.F42_CA_ID, "123456789876543")
.GenerateMac(data => {
byte[] mac = MacCalculator(data);
return mac;
})
.SetHeader("1234567890")
.Build();
with ISOMessageBuilder.Packer(VERSION.V1987) you can build iso message as you can see above. the 'Packer' method return 8 method for 8 iso message class (authorization, financial, networkManagment, ...) based on ISO8583 after that you can set message function and message origin by MTI method.
MTI method accept string and enums as parameter, and I think enums are much clear and readable.
As you know an iso message need a 'Processing Code' and you can set it's value by ProcessCode method, and then we can start setting required fields by SetField method and accept String and enums as field number parameter.
After all, you must call build method to generate iso message object.
For unpacking a buffer received from server you need to use ISOMessageBuilder.Unpacker():
ISOMessage isoMessage = ISOMessageBuilder.Unpacker()
.SetMessage(SAMPLE_HEADER + SAMPLE_MSG)
.Build();ISOMessage object has multiple method provide fields, message body, header and ...
for security reason they will return byte array exept .ToString and .GetStringField method, because Strings stay alive in memory until a garbage collector will come to collect that. but you can clear byte or char arrays after use and calling garbage collector is not important anymore.
If you use Strings, taking memory dumps will be dangerous.
byte[] body = isoMessage.GetBody(); byte[] trace = isoMessage.GetField(11); string trace = isoMessage.GetStringField(FIELDS.F11_STAN);Sending message to iso server and received response from server can be done with ISOClient in many ways:
IISOClient client = ISOClientBuilder.CreateSocket(HOST, PORT)
.Build();
ISOMessage respIso = client.SendMessageSync(reqIso);
client.Disconnect();Copyright 2018 Mohsen Beiranvand
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