Feature: endorsement forging

Author: aopoltorzhicky

tools/forge/endorment.go

@@ -2,6 +2,7 @@ package forge
 
 import (
 	"bytes"
+	"encoding/binary"
 
 	"github.com/dipdup-net/go-lib/node"
 	"github.com/dipdup-net/go-lib/tools/types"
@@ -26,7 +27,9 @@ func Endorsement(endorsement node.Endorsement, branch string) ([]byte, error) {
 	if _, err := buf.Write(tag); err != nil {
 		return nil, err
 	}
-	level, err := ForgeInt(types.NewBigInt(int64(endorsement.Level)))
+
+	level := make([]byte, 4)
+	binary.BigEndian.PutUint32(level, uint32(endorsement.Level))
 	if err != nil {
 		return nil, err
 	}

tools/forge/endorment_test.go

@@ -0,0 +1,63 @@
+package forge
+
+import (
+	"encoding/hex"
+	"testing"
+
+	"github.com/dipdup-net/go-lib/node"
+	"github.com/stretchr/testify/assert"
+)
+
+func TestEndorsement(t *testing.T) {
+	tests := []struct {
+		name        string
+		endorsement node.Endorsement
+		branch      string
+		want        string
+		wantErr     bool
+	}{
+		{
+			name: "test 1",
+			endorsement: node.Endorsement{
+				Level:    751292,
+				Metadata: &node.EndorsementMetadata{},
+			},
+			branch: "BMbpxQAU7Jat7g9ZnKrP3brgqFX6r2VX8PPXCxNbFZeURA6DbEF",
+			want:   "f8bc58c3ceaa7aaaa09d2892d0ee234231ffe46b484e5f7e7b32b5bfd618b67200000b76bc",
+		}, {
+			name: "test 2",
+			endorsement: node.Endorsement{
+				Level:    751179,
+				Metadata: &node.EndorsementMetadata{},
+			},
+			branch: "BM2JkusQmT885mqjKiJXfMJrgQXZTwoEsCM8tkuvGyJLPrSw2ih",
+			want:   "ac9f7b86a813cf29a18a16bda49a434c92a5a583f1630f0ad2b8224b7b26f05a00000b764b",
+		}, {
+			name: "test 3",
+			endorsement: node.Endorsement{
+				Level:    751447,
+				Metadata: &node.EndorsementMetadata{},
+			},
+			branch: "BLp1dxsyPLc58x4cSMKGVevdQfgo9VBHy46kqnhsJSrNgteDPex",
+			want:   "90b48e1e6ff05a6a4bd2527dbb9853a5e152906847bc4c3eda57bd1e5742a39900000b7757",
+		}, {
+			name: "test 4",
+			endorsement: node.Endorsement{
+				Level:    1479809,
+				Metadata: &node.EndorsementMetadata{},
+			},
+			branch: "BL38RNz32eAVhgvV5bUMWUxGMq2v2wkst9UaN7CbW7hLC6THCQ6",
+			want:   "2acaf73c5f06c812083f5989ea19d1b2a4d71335f988233c5145814d695b3b4c0000169481",
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got, err := Endorsement(tt.endorsement, tt.branch)
+			if (err != nil) != tt.wantErr {
+				t.Errorf("Endorsement() error = %v, wantErr %v", err, tt.wantErr)
+				return
+			}
+			assert.Equal(t, tt.want, hex.EncodeToString(got))
+		})
+	}
+}

tools/forge/forge.go

@@ -7,6 +7,7 @@ import (
 	"strconv"
 
 	"github.com/dipdup-net/go-lib/tools/types"
+	"github.com/ebellocchia/go-base58"
 	"github.com/pkg/errors"
 )
 
@@ -99,7 +100,11 @@ func ForgeBool(value bool) []byte {
 
 // ForgeString -
 func ForgeString(value string) ([]byte, error) {
-	return nil, nil
+	decoded, err := base58.New(base58.AlphabetBitcoin).Decode(value)
+	if err != nil {
+		return nil, err
+	}
+	return decoded[2 : len(decoded)-4], nil
 }
 
 func reverse(arr []string) []string {