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composite_test.go
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package field
import (
"encoding/hex"
"fmt"
"strconv"
"sync"
"testing"
"github.com/moov-io/iso8583/encoding"
iso8583errors "github.com/moov-io/iso8583/errors"
"github.com/moov-io/iso8583/padding"
"github.com/moov-io/iso8583/prefix"
"github.com/moov-io/iso8583/sort"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
)
var (
compositeTestSpec = &Spec{
Length: 6,
Description: "Test Spec",
Pref: prefix.ASCII.Fixed,
Pad: padding.None,
Tag: &TagSpec{
Sort: sort.StringsByInt,
},
Subfields: map[string]Field{
"1": NewString(&Spec{
Length: 2,
Description: "String Field",
Enc: encoding.ASCII,
Pref: prefix.ASCII.Fixed,
}),
"2": NewString(&Spec{
Length: 2,
Description: "String Field",
Enc: encoding.ASCII,
Pref: prefix.ASCII.Fixed,
}),
"3": NewNumeric(&Spec{
Length: 2,
Description: "Numeric Field",
Enc: encoding.ASCII,
Pref: prefix.ASCII.Fixed,
}),
},
}
compositeTestSpecWithTagPadding = &Spec{
Length: 30,
Description: "Test Spec",
Pref: prefix.ASCII.LL,
Tag: &TagSpec{
Length: 2,
Enc: encoding.ASCII,
Pad: padding.Left('0'),
Sort: sort.StringsByInt,
},
Subfields: map[string]Field{
"1": NewString(&Spec{
Length: 2,
Description: "String Field",
Enc: encoding.ASCII,
Pref: prefix.ASCII.LL,
}),
"2": NewString(&Spec{
Length: 2,
Description: "String Field",
Enc: encoding.ASCII,
Pref: prefix.ASCII.LL,
}),
"3": NewNumeric(&Spec{
Length: 2,
Description: "Numeric Field",
Enc: encoding.ASCII,
Pref: prefix.ASCII.LL,
}),
"11": NewComposite(&Spec{
Length: 6,
Description: "Sub-Composite Field",
Pref: prefix.ASCII.LL,
Tag: &TagSpec{
Length: 2,
Enc: encoding.ASCII,
Pad: padding.Left('0'),
Sort: sort.StringsByInt,
},
Subfields: map[string]Field{
"1": NewString(&Spec{
Length: 2,
Description: "String Field",
Enc: encoding.ASCII,
Pref: prefix.ASCII.LL,
}),
},
}),
},
}
compositeTestSpecWithDefaultBitmap = &Spec{
Length: 36,
Description: "Test Spec",
Pref: prefix.ASCII.LL,
Bitmap: NewBitmap(&Spec{
Length: 8,
Description: "Bitmap",
Enc: encoding.BytesToASCIIHex,
Pref: prefix.Hex.Fixed,
DisableAutoExpand: true,
}),
Subfields: map[string]Field{
"1": NewString(&Spec{
Length: 2,
Description: "String Field",
Enc: encoding.ASCII,
Pref: prefix.ASCII.LL,
}),
"2": NewString(&Spec{
Length: 2,
Description: "String Field",
Enc: encoding.ASCII,
Pref: prefix.ASCII.LL,
}),
"3": NewNumeric(&Spec{
Length: 2,
Description: "Numeric Field",
Enc: encoding.ASCII,
Pref: prefix.ASCII.LL,
}),
"11": NewComposite(&Spec{
Length: 6,
Description: "Sub-Composite Field",
Pref: prefix.ASCII.LL,
Tag: &TagSpec{
Length: 2,
Enc: encoding.ASCII,
Pad: padding.Left('0'),
Sort: sort.StringsByInt,
},
Subfields: map[string]Field{
"1": NewString(&Spec{
Length: 2,
Description: "String Field",
Enc: encoding.ASCII,
Pref: prefix.ASCII.LL,
}),
},
}),
},
}
compositeTestSpecWithSizedBitmap = &Spec{
Length: 30,
Description: "Test Spec",
Pref: prefix.ASCII.LL,
Bitmap: NewBitmap(&Spec{
Length: 3,
Description: "Bitmap",
Enc: encoding.BytesToASCIIHex,
Pref: prefix.Hex.Fixed,
DisableAutoExpand: true,
}),
Subfields: map[string]Field{
"1": NewString(&Spec{
Length: 2,
Description: "String Field",
Enc: encoding.ASCII,
Pref: prefix.ASCII.LL,
}),
"2": NewString(&Spec{
Length: 2,
Description: "String Field",
Enc: encoding.ASCII,
Pref: prefix.ASCII.LL,
}),
"3": NewNumeric(&Spec{
Length: 2,
Description: "Numeric Field",
Enc: encoding.ASCII,
Pref: prefix.ASCII.LL,
}),
"11": NewComposite(&Spec{
Length: 6,
Description: "Sub-Composite Field",
Pref: prefix.ASCII.LL,
Tag: &TagSpec{
Length: 2,
Enc: encoding.ASCII,
Pad: padding.Left('0'),
Sort: sort.StringsByInt,
},
Subfields: map[string]Field{
"1": NewString(&Spec{
Length: 2,
Description: "String Field",
Enc: encoding.ASCII,
Pref: prefix.ASCII.LL,
}),
},
}),
},
}
compositeTestSpecWithoutTagPadding = &Spec{
Length: 30,
Description: "Test Spec",
Pref: prefix.ASCII.LL,
Tag: &TagSpec{
Length: 2,
Enc: encoding.ASCII,
Sort: sort.StringsByInt,
},
Subfields: map[string]Field{
"01": NewString(&Spec{
Length: 2,
Description: "String Field",
Enc: encoding.ASCII,
Pref: prefix.ASCII.LL,
}),
"02": NewString(&Spec{
Length: 2,
Description: "String Field",
Enc: encoding.ASCII,
Pref: prefix.ASCII.LL,
}),
},
}
tlvTestSpec = &Spec{
Length: 999,
Description: "ICC Data – EMV Having Multiple Tags",
Pref: prefix.ASCII.LLL,
Tag: &TagSpec{
Enc: encoding.BerTLVTag,
Sort: sort.StringsByHex,
},
Subfields: map[string]Field{
"9A": NewHex(&Spec{
Description: "Transaction Date",
Enc: encoding.Binary,
Pref: prefix.BerTLV,
}),
"9F02": NewHex(&Spec{
Description: "Amount, Authorized (Numeric)",
Enc: encoding.Binary,
Pref: prefix.BerTLV,
}),
},
}
constructedBERTLVTestSpec = &Spec{
Length: 999,
Description: "ICC Data – EMV Having Multiple Tags",
Pref: prefix.ASCII.LLL,
Tag: &TagSpec{
Enc: encoding.BerTLVTag,
Sort: sort.StringsByHex,
},
Subfields: map[string]Field{
"82": NewHex(&Spec{
Description: "Application Interchange Profile",
Enc: encoding.Binary,
Pref: prefix.BerTLV,
}),
"9F36": NewHex(&Spec{
Description: "Currency Code, Application Reference",
Enc: encoding.Binary,
Pref: prefix.BerTLV,
}),
"9F3B": NewComposite(&Spec{
Description: "Currency Code, Application Reference",
Pref: prefix.BerTLV,
Tag: &TagSpec{
Enc: encoding.BerTLVTag,
Sort: sort.StringsByHex,
},
Subfields: map[string]Field{
"9F45": NewHex(&Spec{
Description: "Data Authentication Code",
Enc: encoding.Binary,
Pref: prefix.BerTLV,
}),
"9F02": NewHex(&Spec{
Description: "Amount, Authorized (Numeric)",
Enc: encoding.Binary,
Pref: prefix.BerTLV,
}),
},
}),
},
}
tlvASCIILSpec = &Spec{
Length: 999,
Description: "ASCII Unknown TLV with PrefUnknownTLV: prefix.ASCII.L",
Pref: prefix.ASCII.LLL,
Tag: &TagSpec{
Length: 2,
Enc: encoding.ASCII,
Sort: sort.Strings,
SkipUnknownTLVTags: true,
PrefUnknownTLV: prefix.ASCII.L,
},
Subfields: map[string]Field{
"01": NewString(&Spec{
Length: 9,
Description: "String Field",
Enc: encoding.ASCII,
Pref: prefix.ASCII.L,
}),
"02": NewString(&Spec{
Length: 9,
Description: "String Field",
Enc: encoding.ASCII,
Pref: prefix.ASCII.L,
}),
},
}
)
type CompositeTestData struct {
F1 *String
F2 *String
F3 *Numeric
F11 *SubCompositeData
}
type SubCompositeData struct {
F1 *String
}
type CompositeTestDataWithoutTagPadding struct {
F01 *String
F02 *String
}
type CompositeTestDataWithoutTagPaddingWithIndexTag struct {
F01 *String `index:"01"`
F02 *String `index:"02"`
}
type TLVTestData struct {
F9A *Hex
F9F02 *Hex
}
type ConstructedTLVTestData struct {
F82 *Hex
F9F36 *Hex
F9F3B *SubConstructedTLVTestData
}
type SubConstructedTLVTestData struct {
F9F45 *Hex
F9F02 *Hex
}
func TestCompositeField_Marshal(t *testing.T) {
t.Run("Marshal returns error on nil value", func(t *testing.T) {
composite := NewComposite(compositeTestSpec)
err := composite.Marshal(nil)
require.EqualError(t, err, "data is not a pointer")
})
t.Run("Marshal doesn't return an error when nil pointer is of struct type", func(t *testing.T) {
composite := NewComposite(compositeTestSpec)
var data *CompositeTestData
err := composite.Marshal(data)
require.NoError(t, err)
})
t.Run("Marshal returns an error on provision of primitive type data", func(t *testing.T) {
composite := NewComposite(compositeTestSpec)
err := composite.Marshal("primitive str")
require.EqualError(t, err, "data is not a pointer")
})
t.Run("Marshal skips fields without index tag", func(t *testing.T) {
// the following data contains 2 fields with proper types but
// without index tag
type tlvTestData struct {
Date *Hex
TransactionID *Hex
}
composite := NewComposite(tlvTestSpec)
err := composite.Marshal(&tlvTestData{
Date: NewHexValue("210720"),
TransactionID: NewHexValue("000000000501"),
})
require.NoError(t, err)
})
}
func TestCompositeField_Unmarshal(t *testing.T) {
t.Run("Unmarshal gets data for composite field", func(t *testing.T) {
// first, we need to populate fields of composite field
// we will do it by packing the field
composite := NewComposite(tlvTestSpec)
err := composite.Marshal(&TLVTestData{
F9A: NewHexValue("210720"),
F9F02: NewHexValue("000000000501"),
})
require.NoError(t, err)
_, err = composite.Pack()
require.NoError(t, err)
data := &TLVTestData{}
err = composite.Unmarshal(data)
require.NoError(t, err)
require.Equal(t, "210720", data.F9A.Value())
require.Equal(t, "000000000501", data.F9F02.Value())
})
t.Run("Unmarshal gets data for composite field (constructed)", func(t *testing.T) {
composite := NewComposite(constructedBERTLVTestSpec)
err := composite.Marshal(&ConstructedTLVTestData{
F82: NewHexValue("017F"),
F9F36: NewHexValue("027F"),
F9F3B: &SubConstructedTLVTestData{
F9F45: NewHexValue("047F"),
},
})
require.NoError(t, err)
_, err = composite.Pack()
require.NoError(t, err)
data := &ConstructedTLVTestData{}
err = composite.Unmarshal(data)
require.NoError(t, err)
require.Equal(t, "017F", data.F82.Value())
require.Equal(t, "027F", data.F9F36.Value())
require.Equal(t, "047F", data.F9F3B.F9F45.Value())
})
t.Run("Unmarshal gets data for composite field using field tag `index`", func(t *testing.T) {
type tlvTestData struct {
Date *Hex `index:"9A"`
TransactionID *Hex `index:"9F02"`
}
// first, we need to populate fields of composite field
// we will do it by packing the field
composite := NewComposite(tlvTestSpec)
err := composite.Marshal(&TLVTestData{
F9A: NewHexValue("210720"),
F9F02: NewHexValue("000000000501"),
})
require.NoError(t, err)
_, err = composite.Pack()
require.NoError(t, err)
data := &tlvTestData{}
err = composite.Unmarshal(data)
require.NoError(t, err)
require.Equal(t, "210720", data.Date.Value())
require.Equal(t, "000000000501", data.TransactionID.Value())
})
t.Run("Unmarshal skips fields without index tag", func(t *testing.T) {
// the following data contains 2 fields with proper types but
// without index tag
type tlvTestData struct {
Date *Hex
TransactionID *Hex
}
// first, we need to populate fields of composite field
// we will do it by packing the field
composite := NewComposite(tlvTestSpec)
err := composite.Marshal(&TLVTestData{
F9A: NewHexValue("210720"),
F9F02: NewHexValue("000000000501"),
})
require.NoError(t, err)
_, err = composite.Pack()
require.NoError(t, err)
data := &tlvTestData{}
err = composite.Unmarshal(data)
require.NoError(t, err)
})
}
func TestCompositeField_Unset(t *testing.T) {
t.Run("Unset creates new empty field when it deletes it", func(t *testing.T) {
composite := NewComposite(constructedBERTLVTestSpec)
err := composite.Marshal(&ConstructedTLVTestData{
F82: NewHexValue("017F"),
F9F36: NewHexValue("027F"),
F9F3B: &SubConstructedTLVTestData{
F9F45: NewHexValue("047F"),
F9F02: NewHexValue("057F"),
},
})
require.NoError(t, err)
data := &ConstructedTLVTestData{}
require.NoError(t, composite.Unmarshal(data))
// all fields are set
require.Equal(t, "017F", data.F82.Value())
require.Equal(t, "027F", data.F9F36.Value())
require.Equal(t, "047F", data.F9F3B.F9F45.Value())
require.Equal(t, "057F", data.F9F3B.F9F02.Value())
// if we delete subfield F9F3B and then set only one field of it,
// the other field should be nil (not set)
require.NoError(t, composite.UnsetSubfields("9F3B"))
data = &ConstructedTLVTestData{}
require.NoError(t, composite.Unmarshal(data))
require.Equal(t, "017F", data.F82.Value())
require.Equal(t, "027F", data.F9F36.Value())
require.Nil(t, data.F9F3B) // F9F3B should be nil as it was unset / deleted
// if we set only one field of subfield F9F3B, the other field should be nil (not set)
err = composite.Marshal(&ConstructedTLVTestData{
F9F3B: &SubConstructedTLVTestData{
F9F45: NewHexValue("047F"),
},
})
require.NoError(t, err)
data = &ConstructedTLVTestData{}
require.NoError(t, composite.Unmarshal(data))
require.Equal(t, "017F", data.F82.Value())
require.Equal(t, "027F", data.F9F36.Value())
require.Equal(t, "047F", data.F9F3B.F9F45.Value())
require.Nil(t, data.F9F3B.F9F02) // F9F02 should be nil as it was not set
})
t.Run("Unset sets all fields of composite field to nil", func(t *testing.T) {
composite := NewComposite(constructedBERTLVTestSpec)
err := composite.Marshal(&ConstructedTLVTestData{
F82: NewHexValue("017F"),
F9F36: NewHexValue("027F"),
F9F3B: &SubConstructedTLVTestData{
F9F45: NewHexValue("047F"),
},
})
require.NoError(t, err)
data := &ConstructedTLVTestData{}
err = composite.Unmarshal(data)
require.NoError(t, err)
// all fields are set
require.Equal(t, "017F", data.F82.Value())
require.Equal(t, "027F", data.F9F36.Value())
require.Equal(t, "047F", data.F9F3B.F9F45.Value())
// unset the composite fields
err = composite.UnsetSubfields("82", "9F3B.9F45")
require.NoError(t, err)
data = &ConstructedTLVTestData{}
err = composite.Unmarshal(data)
require.NoError(t, err)
require.Nil(t, data.F82)
require.Equal(t, "027F", data.F9F36.Value())
require.Nil(t, data.F9F3B.F9F45)
})
}
func TestTLVPacking(t *testing.T) {
t.Run("Pack correctly serializes data to bytes (general tlv)", func(t *testing.T) {
data := &TLVTestData{
F9A: NewHexValue("210720"),
F9F02: NewHexValue("000000000501"),
}
composite := NewComposite(tlvTestSpec)
err := composite.Marshal(data)
require.NoError(t, err)
packed, err := composite.Pack()
require.NoError(t, err)
// TLV Length: 0x30, 0x31, 0x34 (014)
//
// Tag: 0x9a (9A)
// Length: 0x03 (3 bytes)
// Value: 0x21, 0x07, 0x20 (210720)
//
// Tag: 0x9f, 0x02 (9F02)
// Length: 0x06 (6 bytes)
// Value: 0x00, 0x00, 0x00, 0x00, 0x05, 0x01 (000000000501)
require.Equal(t, []byte{0x30, 0x31, 0x34, 0x9a, 0x3, 0x21, 0x7, 0x20, 0x9f, 0x2, 0x6, 0x0, 0x0, 0x0, 0x0, 0x5, 0x1}, packed)
})
t.Run("Unpack correctly deserialises bytes to the data struct", func(t *testing.T) {
composite := NewComposite(tlvTestSpec)
read, err := composite.Unpack([]byte{0x30, 0x31, 0x34, 0x9a, 0x3, 0x21, 0x7, 0x20, 0x9f, 0x2, 0x6, 0x0, 0x0, 0x0, 0x0, 0x5, 0x1})
require.NoError(t, err)
require.Equal(t, 17, read)
data := &TLVTestData{}
require.NoError(t, composite.Unmarshal(data))
require.Equal(t, "210720", data.F9A.Value())
require.Equal(t, "000000000501", data.F9F02.Value())
})
t.Run("Unpack correctly deserialises bytes to the data struct skipping unexpected tags", func(t *testing.T) {
// Turn on the skipping unexpected tags capability and turn it off at the end of test
tlvTestSpec.Tag.SkipUnknownTLVTags = true
defer func() {
tlvTestSpec.Tag.SkipUnknownTLVTags = false
}()
// The field's specification contains the tags 9A and 9F02
composite := NewComposite(tlvTestSpec)
// This data contains tags 9A and 9F02 that are mapped in the specification, but also
// contains tags 9F36 and 9F37 which aren't in the specification.
read, err := composite.Unpack([]byte{0x30, 0x32, 0x36, 0x9f, 0x36, 0x2, 0x1, 0x57, 0x9a, 0x3, 0x21, 0x7, 0x20,
0x9f, 0x2, 0x6, 0x0, 0x0, 0x0, 0x0, 0x5, 0x1, 0x9f, 0x37, 0x4, 0x9b, 0xad, 0xbc, 0xab})
require.NoError(t, err)
require.Equal(t, 29, read)
data := &TLVTestData{}
require.NoError(t, composite.Unmarshal(data))
require.Equal(t, "210720", data.F9A.Value())
require.Equal(t, "000000000501", data.F9F02.Value())
})
t.Run("Pack correctly serializes data to bytes (constructed ber-tlv)", func(t *testing.T) {
data := &ConstructedTLVTestData{
F82: NewHexValue("017f"),
F9F36: NewHexValue("027f"),
F9F3B: &SubConstructedTLVTestData{
F9F45: NewHexValue("047f"),
},
}
composite := NewComposite(constructedBERTLVTestSpec)
err := composite.Marshal(data)
require.NoError(t, err)
packed, err := composite.Pack()
require.NoError(t, err)
// TLV Length: 0x30, 0x31, 0x37 (017)
//
// Tag: 0x82 (82)
// Length: 0x02 (2 bytes)
// Value: 0x01, 0x7f (017F)
//
// Tag: 0x9f, 0x36 (9F36)
// Length: 0x02 (2 bytes)
// Value: 0x02, 0x7f (027f)
//
// Tag: 0x9f, 0x3b (9F3B)
// Length: 0x05 (5 bytes)
// Value:
// Tag: 0x9f, 0x45 (9F45)
// Length: 0x02 (2 bytes)
// Value: 0x04, 0x7f (047F)
require.Equal(t, []byte{0x30, 0x31, 0x37, 0x82, 0x2, 0x1, 0x7f, 0x9f, 0x36, 0x2, 0x2, 0x7f, 0x9f, 0x3b, 0x5, 0x9f, 0x45, 0x2, 0x4, 0x7f}, packed)
})
t.Run("Unpack correctly deserialises bytes to the data struct (constructed ber-tlv)", func(t *testing.T) {
composite := NewComposite(constructedBERTLVTestSpec)
read, err := composite.Unpack([]byte{0x30, 0x31, 0x37, 0x82, 0x2, 0x1, 0x7f, 0x9f, 0x36, 0x2, 0x2, 0x7f, 0x9f, 0x3b, 0x5, 0x9f, 0x45, 0x2, 0x4, 0x7f})
require.NoError(t, err)
require.Equal(t, 20, read)
data := &ConstructedTLVTestData{}
require.NoError(t, composite.Unmarshal(data))
require.Equal(t, "017F", data.F82.Value())
require.Equal(t, "027F", data.F9F36.Value())
require.Equal(t, "047F", data.F9F3B.F9F45.Value())
})
t.Run("Unpack correctly deserialises bytes to the data struct (constructed ber-tlv, unordered value)", func(t *testing.T) {
composite := NewComposite(constructedBERTLVTestSpec)
read, err := composite.Unpack([]byte{0x30, 0x31, 0x37, 0x9f, 0x36, 0x2, 0x2, 0x7f, 0x9f, 0x3b, 0x5, 0x9f, 0x45, 0x2, 0x4, 0x7f, 0x82, 0x2, 0x1, 0x7f})
require.NoError(t, err)
require.Equal(t, 20, read)
data := &ConstructedTLVTestData{}
require.NoError(t, composite.Unmarshal(data))
require.Equal(t, "017F", data.F82.Value())
require.Equal(t, "027F", data.F9F36.Value())
require.Equal(t, "047F", data.F9F3B.F9F45.Value())
})
t.Run("Unpack throws an error due unexpected tags", func(t *testing.T) {
composite := NewComposite(tlvTestSpec)
// This data contains tags 9A and 9F02 that are mapped in the specification, but also
// contains tags 9F36 and 9F37 which aren't in the specification.
_, err := composite.Unpack([]byte{0x30, 0x32, 0x36, 0x9f, 0x36, 0x2, 0x1, 0x57, 0x9a, 0x3, 0x21, 0x7, 0x20,
0x9f, 0x2, 0x6, 0x0, 0x0, 0x0, 0x0, 0x5, 0x1, 0x9f, 0x37, 0x4, 0x9b, 0xad, 0xbc, 0xab})
require.EqualError(t, err, "failed to unpack subfield 9F36: field not defined in Spec")
})
t.Run("ASCII Unknown TLV with PrefUnknownTLV: prefix.ASCII.L: unpack correct deserialises bytes to the data struct skipping unexpected tags", func(t *testing.T) {
// The field's specification contains the tags 9A and 9F02
composite := NewComposite(tlvASCIILSpec)
_, err := composite.Unpack([]byte{0x30, 0x31, 0x35, 0x30, 0x31, 0x32, 0x33, 0x34, 0x39, 0x39, 0x31, 0x30, 0x30, 0x32, 0x33, 0x34, 0x35, 0x36})
require.NoError(t, err)
require.Len(t, composite.subfields, 2)
v, err := composite.subfields["01"].String()
require.NoError(t, err)
require.Equal(t, "34", v)
v, err = composite.subfields["02"].String()
require.NoError(t, err)
require.Equal(t, "456", v)
})
}
func TestCompositePacking(t *testing.T) {
t.Run("Pack returns an error on mismatch of subfield types", func(t *testing.T) {
type TestDataIncorrectType struct {
F1 *Numeric
}
composite := NewComposite(compositeTestSpec)
err := composite.Marshal(&TestDataIncorrectType{
F1: NewNumericValue(1),
})
require.Error(t, err)
require.EqualError(t, err, "marshalling field 1: data does not match required *String or (string, *string, int, *int) type")
})
t.Run("Pack returns error on failure of subfield packing", func(t *testing.T) {
data := &CompositeTestData{
// This subfield will return an error on F1.Pack() as its length
// exceeds the max length defined in the spec.
F1: NewStringValue("ABCD"),
F2: NewStringValue("CD"),
F3: NewNumericValue(12),
}
composite := NewComposite(compositeTestSpec)
err := composite.Marshal(data)
require.NoError(t, err)
_, err = composite.Pack()
require.EqualError(t, err, "failed to pack subfield 1: failed to encode length: field length: 4 should be fixed: 2")
})
t.Run("Pack returns error when encoded data length is larger than specified fixed max length", func(t *testing.T) {
invalidSpec := &Spec{
// Base field length < summation of lengths of subfields
// This will throw an error when encoding the field's length.
Length: 4,
Pref: prefix.ASCII.Fixed,
Tag: &TagSpec{
Sort: sort.StringsByInt,
},
Subfields: map[string]Field{
"1": NewString(&Spec{
Length: 2,
Enc: encoding.ASCII,
Pref: prefix.ASCII.Fixed,
}),
"2": NewString(&Spec{
Length: 2,
Enc: encoding.ASCII,
Pref: prefix.ASCII.Fixed,
}),
"3": NewNumeric(&Spec{
Length: 2,
Enc: encoding.ASCII,
Pref: prefix.ASCII.Fixed,
}),
},
}
data := &CompositeTestData{
F1: NewStringValue("AB"),
F2: NewStringValue("CD"),
F3: NewNumericValue(12),
}
composite := NewComposite(invalidSpec)
err := composite.Marshal(data)
require.NoError(t, err)
_, err = composite.Pack()
require.EqualError(t, err, "failed to encode length: field length: 6 should be fixed: 4")
})
t.Run("Pack correctly serializes data with padded tags to bytes", func(t *testing.T) {
data := &CompositeTestData{
F1: NewStringValue("AB"),
F2: NewStringValue("CD"),
F3: NewNumericValue(12),
}
composite := NewComposite(compositeTestSpec)
err := composite.Marshal(data)
require.NoError(t, err)
packed, err := composite.Pack()
require.NoError(t, err)
require.NoError(t, err)
require.Equal(t, "ABCD12", string(packed))
})
t.Run("Pack and unpack data with BCD encoding", func(t *testing.T) {
var compositeSpecWithBCD = &Spec{
Length: 2, // always in bytes
Description: "Point of Service Entry Mode",
Pref: prefix.BCD.Fixed,
Tag: &TagSpec{
Sort: sort.StringsByInt,
},
Subfields: map[string]Field{
"1": NewString(&Spec{
Length: 2,
Description: "PAN/Date Entry Mode",
Enc: encoding.BCD,
Pref: prefix.BCD.Fixed,
}),
"2": NewString(&Spec{
Length: 2,
Description: "PIN Entry Capability",
Enc: encoding.BCD,
Pref: prefix.BCD.Fixed,
}),
},
}
type data struct {
PANEntryMode *String `index:"1"`
PINEntryMode *String `index:"2"`
}
f := NewComposite(compositeSpecWithBCD)
d := &data{
PANEntryMode: NewStringValue("01"),
PINEntryMode: NewStringValue("02"),
}
err := f.Marshal(d)
require.NoError(t, err)
packed, err := f.Pack()
require.NoError(t, err)
require.Equal(t, []byte{0x01, 0x02}, packed)
// unpacking
f = NewComposite(compositeSpecWithBCD)
read, err := f.Unpack(packed)
require.NoError(t, err)
require.Equal(t, 2, read) // two bytes read
d = &data{}
err = f.Unmarshal(d)
require.NoError(t, err)
require.Equal(t, "01", d.PANEntryMode.Value())
require.Equal(t, "02", d.PINEntryMode.Value())
})
t.Run("Unpack returns an error on mismatch of subfield types", func(t *testing.T) {
type TestDataIncorrectType struct {
F1 *Numeric
}
composite := NewComposite(compositeTestSpec)
_, err := composite.Unpack([]byte("ABCD12"))
require.NoError(t, err)
data := &TestDataIncorrectType{}
err = composite.Unmarshal(data)
require.Error(t, err)
require.EqualError(t, err, "unmarshalling field 1: unsupported type: expected *String, *string, or reflect.Value, got *field.Numeric")
})
t.Run("Unpack returns an error on failure of subfield to unpack bytes", func(t *testing.T) {
data := &CompositeTestData{}
composite := NewComposite(compositeTestSpec)
err := composite.Marshal(data)
require.NoError(t, err)
// Last two characters must be an integer type. F3 fails to unpack.
read, err := composite.Unpack([]byte("ABCDEF"))
require.Equal(t, 0, read)
require.Error(t, err)
var unpackError *iso8583errors.UnpackError
require.ErrorAs(t, err, &unpackError)
assert.Equal(t, "3", unpackError.FieldID)
assert.Equal(t, []string{"3"}, unpackError.FieldIDs())
require.EqualError(t, err, "failed to unpack subfield 3: failed to set bytes: failed to convert into number")
require.ErrorIs(t, err, strconv.ErrSyntax)
})
t.Run("Unpack returns an error on length of data exceeding max length", func(t *testing.T) {
spec := &Spec{
Length: 4,
Pref: prefix.ASCII.L,
Tag: &TagSpec{
Sort: sort.StringsByInt,
},
Subfields: map[string]Field{
"1": NewString(&Spec{
Length: 2,
Enc: encoding.ASCII,
Pref: prefix.ASCII.Fixed,
}),
"2": NewString(&Spec{
Length: 2,
Enc: encoding.ASCII,
Pref: prefix.ASCII.Fixed,
}),
"3": NewNumeric(&Spec{
Length: 2,
Enc: encoding.ASCII,
Pref: prefix.ASCII.Fixed,
}),
},
}
data := &CompositeTestData{}
composite := NewComposite(spec)
err := composite.Marshal(data)
require.NoError(t, err)
// Length of denoted by prefix is too long, causing failure to decode length.
read, err := composite.Unpack([]byte("7ABCD123"))
require.Equal(t, 0, read)
require.Error(t, err)
require.EqualError(t, err, "failed to decode length: data length: 7 is larger than maximum 4")
})
t.Run("Unpack without error when not all subfields are set", func(t *testing.T) {
spec := &Spec{
Length: 4,
Pref: prefix.ASCII.L,
Tag: &TagSpec{
Sort: sort.StringsByInt,
},
Subfields: map[string]Field{
"1": NewString(&Spec{
Length: 2,
Enc: encoding.ASCII,
Pref: prefix.ASCII.Fixed,
}),
"2": NewString(&Spec{
Length: 2,
Enc: encoding.ASCII,
Pref: prefix.ASCII.Fixed,
}),
"3": NewNumeric(&Spec{
Length: 2,
Enc: encoding.ASCII,
Pref: prefix.ASCII.Fixed,
}),
},
}
data := &CompositeTestData{}
composite := NewComposite(spec)
err := composite.Marshal(data)
require.NoError(t, err)
// There is data only for first subfield
read, err := composite.Unpack([]byte("2AB"))
require.Equal(t, 3, read)
require.NoError(t, err)
})
t.Run("Unpack returns an error on offset not matching data length", func(t *testing.T) {
invalidSpec := &Spec{
// Base field length < summation of lengths of subfields
// This will throw an error when encoding the field's length.
Length: 4,
Pref: prefix.ASCII.Fixed,
Tag: &TagSpec{
Sort: sort.StringsByInt,
},
Subfields: map[string]Field{
"1": NewString(&Spec{