align thresholdStringEncoder

x/tx/signing/aminojson/encoder.go

@@ -166,29 +166,34 @@ func moduleAccountEncoder(_ *Encoder, msg protoreflect.Message, w io.Writer) err
 // also see:
 // https://github.com/cosmos/cosmos-sdk/blob/b49f948b36bc991db5be431607b475633aed697e/proto/cosmos/crypto/multisig/keys.proto#L15/
 func thresholdStringEncoder(enc *Encoder, msg protoreflect.Message, w io.Writer) error {
-	pk, ok := msg.Interface().(*multisig.LegacyAminoPubKey)
-	if !ok {
+	pk := &multisig.LegacyAminoPubKey{}
+	msgDesc := msg.Descriptor()
+	fields := msgDesc.Fields()
+	if msgDesc.FullName() != pk.ProtoReflect().Descriptor().FullName() {
 		return errors.New("thresholdStringEncoder: msg not a multisig.LegacyAminoPubKey")
 	}
-	_, err := fmt.Fprintf(w, `{"threshold":"%d","pubkeys":`, pk.Threshold)
-	if err != nil {
-		return err
-	}
-
-	if len(pk.PublicKeys) == 0 {
-		_, err = io.WriteString(w, `[]}`)
-		return err
-	}
 
-	fields := msg.Descriptor().Fields()
 	pubkeysField := fields.ByName("public_keys")
 	pubkeys := msg.Get(pubkeysField).List()
 
-	err = enc.marshalList(pubkeys, pubkeysField, w)
+	_, err := io.WriteString(w, `{"pubkeys":`)
 	if err != nil {
 		return err
 	}
-	_, err = io.WriteString(w, `}`)
+	if pubkeys.Len() == 0 {
+		_, err := io.WriteString(w, `[]`)
+		if err != nil {
+			return err
+		}
+	} else {
+		err := enc.marshalList(pubkeys, pubkeysField, w)
+		if err != nil {
+			return err
+		}
+	}
+
+	threshold := fields.ByName("threshold")
+	_, err = fmt.Fprintf(w, `,"threshold":"%d"}`, msg.Get(threshold).Uint())
 	return err
 }