feat: add json encoding to the blob struct (#125)

share/blob.go

@@ -1,6 +1,7 @@
 package share
 
 import (
+	"encoding/json"
 	"errors"
 	"fmt"
 	"sort"
@@ -85,6 +86,35 @@ func (b *Blob) Marshal() ([]byte, error) {
 	return proto.Marshal(pb)
 }
 
+// MarshalJSON converts blob's data to the json encoded bytes
+func (b *Blob) MarshalJSON() ([]byte, error) {
+	pb := &v1.BlobProto{
+		NamespaceId:      b.namespace.ID(),
+		NamespaceVersion: uint32(b.namespace.Version()),
+		ShareVersion:     uint32(b.shareVersion),
+		Data:             b.data,
+		Signer:           b.signer,
+	}
+	return json.Marshal(pb)
+}
+
+// UnmarshalJSON converts json encoded data to the blob
+func (b *Blob) UnmarshalJSON(bb []byte) error {
+	pb := &v1.BlobProto{}
+	err := json.Unmarshal(bb, pb)
+	if err != nil {
+		return err
+	}
+
+	blob, err := NewBlobFromProto(pb)
+	if err != nil {
+		return err
+	}
+
+	*b = *blob
+	return nil
+}
+
 // NewBlobFromProto creates a new blob from the proto generated type
 func NewBlobFromProto(pb *v1.BlobProto) (*Blob, error) {
 	if pb.NamespaceVersion > NamespaceVersionMax {

share/blob_test.go

@@ -3,6 +3,7 @@ package share
 import (
 	"bytes"
 	"crypto/rand"
+	"encoding/json"
 	"testing"
 
 	v1 "github.com/celestiaorg/go-square/v2/proto/blob/v1"
@@ -25,6 +26,23 @@ func TestProtoEncoding(t *testing.T) {
 	require.Equal(t, blob, newBlob)
 }
 
+func TestJSONEncoding(t *testing.T) {
+	signer := make([]byte, 20)
+	_, err := rand.Read(signer)
+	require.NoError(t, err)
+	blob, err := NewBlob(RandomNamespace(), []byte{1, 2, 3, 4, 5}, 1, signer)
+	require.NoError(t, err)
+
+	data, err := json.Marshal(blob)
+	require.NoError(t, err)
+	require.NotNil(t, data)
+
+	b := &Blob{}
+	err = json.Unmarshal(data, b)
+	require.NoError(t, err)
+	require.Equal(t, blob, b)
+}
+
 func TestBlobConstructor(t *testing.T) {
 	signer := make([]byte, 20)
 	_, err := rand.Read(signer)