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add example for the iso 8583 messaging post
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‎examples/message_test.go

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package examples
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import (
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"fmt"
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"os"
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"testing"
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"time"
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"github.com/moov-io/iso8583"
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"github.com/moov-io/iso8583/encoding"
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"github.com/moov-io/iso8583/field"
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"github.com/moov-io/iso8583/padding"
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"github.com/moov-io/iso8583/prefix"
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"github.com/moov-io/iso8583/sort"
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"github.com/stretchr/testify/require"
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)
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var spec *iso8583.MessageSpec = &iso8583.MessageSpec{
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Name: "ISO 8583 CardFlow Playgroud ASCII Specification",
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Fields: map[int]field.Field{
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0: field.NewString(&field.Spec{
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Length: 4,
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Description: "Message Type Indicator",
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Enc: encoding.BCD,
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Pref: prefix.BCD.Fixed,
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}),
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1: field.NewBitmap(&field.Spec{
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Length: 8,
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Description: "Bitmap",
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Enc: encoding.Binary,
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Pref: prefix.Binary.Fixed,
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}),
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2: field.NewString(&field.Spec{
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Length: 19,
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Description: "Primary Account Number (PAN)",
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Enc: encoding.BCD,
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Pref: prefix.ASCII.LL,
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}),
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3: field.NewString(&field.Spec{
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Length: 6,
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Description: "Amount",
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Enc: encoding.BCD,
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Pref: prefix.BCD.Fixed,
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Pad: padding.Left('0'),
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}),
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4: field.NewString(&field.Spec{
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Length: 12,
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Description: "Transmission Date & Time", // YYMMDDHHMMSS
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Enc: encoding.BCD,
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Pref: prefix.BCD.Fixed,
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}),
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5: field.NewString(&field.Spec{
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Length: 2,
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Description: "Approval Code",
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Enc: encoding.BCD,
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Pref: prefix.BCD.Fixed,
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}),
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6: field.NewString(&field.Spec{
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Length: 6,
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Description: "Authorization Code",
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Enc: encoding.BCD,
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Pref: prefix.BCD.Fixed,
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}),
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7: field.NewString(&field.Spec{
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Length: 3,
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Description: "Currency",
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Enc: encoding.BCD,
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Pref: prefix.BCD.Fixed,
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}),
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8: field.NewString(&field.Spec{
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Length: 4,
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Description: "Card Verification Value (CVV)",
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Enc: encoding.BCD,
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Pref: prefix.BCD.Fixed,
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}),
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9: field.NewString(&field.Spec{
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Length: 4,
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Description: "Card Expiration Date",
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Enc: encoding.BCD,
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Pref: prefix.BCD.Fixed,
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}),
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10: field.NewComposite(&field.Spec{
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Length: 999,
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Description: "Acceptor Information",
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Pref: prefix.ASCII.LLL,
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Tag: &field.TagSpec{
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Length: 2,
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Enc: encoding.ASCII,
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Sort: sort.StringsByInt,
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},
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Subfields: map[string]field.Field{
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"01": field.NewString(&field.Spec{
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Length: 99,
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Description: "Merchant Name",
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Enc: encoding.ASCII,
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Pref: prefix.ASCII.LL,
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}),
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"02": field.NewString(&field.Spec{
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Length: 4,
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Description: "Merchant Category Code (MCC)",
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Enc: encoding.ASCII,
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Pref: prefix.ASCII.Fixed,
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}),
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"03": field.NewString(&field.Spec{
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Length: 10,
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Description: "Merchant Postal Code",
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Enc: encoding.ASCII,
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Pref: prefix.ASCII.LL,
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}),
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"04": field.NewString(&field.Spec{
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Length: 299,
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Description: "Merchant Website",
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Enc: encoding.ASCII,
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Pref: prefix.ASCII.LLL,
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}),
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},
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}),
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11: field.NewString(&field.Spec{
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Length: 6,
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Description: "Systems Trace Audit Number (STAN)",
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Enc: encoding.BCD,
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Pref: prefix.BCD.Fixed,
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}),
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},
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}
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func TestMessagePackingAndUnpacking(t *testing.T) {
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// We use field tags to map the struct fields to the ISO 8583 fields
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type AcceptorInformation struct {
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MerchantName string `iso8583:"01"`
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MerchantCategoryCode string `iso8583:"02"`
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MerchantPostalCode string `iso8583:"03"`
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MerchantWebsite string `iso8583:"04"`
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}
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type AuthorizationRequest struct {
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MTI string `iso8583:"0"`
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PAN string `iso8583:"2"`
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Amount int64 `iso8583:"3"`
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TransactionDatetime string `iso8583:"4"`
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Currency string `iso8583:"7"`
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CVV string `iso8583:"8"`
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ExpirationDate string `iso8583:"9"`
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AcceptorInformation *AcceptorInformation `iso8583:"10"`
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STAN string `iso8583:"11"`
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}
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// Create a new message
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requestMessage := iso8583.NewMessage(spec)
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// use time from our example
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timeFromExample := "240812160140"
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processingTime, err := time.Parse("060102150405", timeFromExample)
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require.NotEmpty(t, processingTime)
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require.NoError(t, err)
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// Set the message fields
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err = requestMessage.Marshal(&AuthorizationRequest{
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MTI: "0100",
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PAN: "4242424242424242",
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Amount: 1000,
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// TransactionDatetime: processingTime.Format("060102150405"),
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TransactionDatetime: time.Now().Format("060102150405"),
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Currency: "840",
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CVV: "7890",
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ExpirationDate: "2512",
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AcceptorInformation: &AcceptorInformation{
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MerchantName: "Merchant Name",
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MerchantCategoryCode: "1234",
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MerchantPostalCode: "1234567890",
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MerchantWebsite: "https://www.merchant.com",
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},
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STAN: "000001",
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})
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require.NoError(t, err)
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// Pack the message
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packed, err := requestMessage.Pack()
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require.NoError(t, err)
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// Unpack the message
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requestMessage = iso8583.NewMessage(spec)
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err = requestMessage.Unpack(packed)
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require.NoError(t, err)
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// Unmarshal the message fields
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var authorizationRequest AuthorizationRequest
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err = requestMessage.Unmarshal(&authorizationRequest)
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require.NoError(t, err)
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// Check the message fields
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require.Equal(t, "0100", authorizationRequest.MTI)
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require.Equal(t, "4242424242424242", authorizationRequest.PAN)
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require.Equal(t, int64(1000), authorizationRequest.Amount)
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// require.Equal(t, timeFromExample, authorizationRequest.TransactionDatetime)
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require.Equal(t, "840", authorizationRequest.Currency)
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require.Equal(t, "7890", authorizationRequest.CVV)
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require.Equal(t, "2512", authorizationRequest.ExpirationDate)
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require.Equal(t, "Merchant Name", authorizationRequest.AcceptorInformation.MerchantName)
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require.Equal(t, "1234", authorizationRequest.AcceptorInformation.MerchantCategoryCode)
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require.Equal(t, "1234567890", authorizationRequest.AcceptorInformation.MerchantPostalCode)
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require.Equal(t, "https://www.merchant.com", authorizationRequest.AcceptorInformation.MerchantWebsite)
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require.Equal(t, "000001", authorizationRequest.STAN)
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// Here is the example of the packed message
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examplePackedMessage := "010073E000000000000031364242424242424242001000240812160140084078902512303636303131334D65726368616E74204E616D653032313233343033313031323334353637383930303430323468747470733A2F2F7777772E6D65726368616E742E636F6D000001"
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// Check the packed message
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// using %X to convert the byte slice to a hex string in uppercase
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require.Equal(t, examplePackedMessage, fmt.Sprintf("%X", packed))
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err = iso8583.Describe(requestMessage, os.Stdout)
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require.NoError(t, err)
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}

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