add lastCommit signatures and bitmap into header information

internal/hmyapi/types.go

@@ -1,6 +1,7 @@
 package hmyapi
 
 import (
+	"encoding/hex"
 	"math/big"
 	"time"
 
@@ -54,6 +55,8 @@ type HeaderInformation struct {
 	Epoch            uint64      `json:"epoch"`
 	Timestamp        string      `json:"timestamp"`
 	UnixTime         uint64      `json:"unixtime"`
+	LastCommitSig    string      `json:"lastCommitSig"`
+	LastCommitBitmap string      `json:"lastCommitBitmap"`
 }
 
 func newHeaderInformation(header *block.Header) *HeaderInformation {
@@ -69,7 +72,10 @@ func newHeaderInformation(header *block.Header) *HeaderInformation {
 		Epoch:            header.Epoch().Uint64(),
 		UnixTime:         header.Time().Uint64(),
 		Timestamp:        time.Unix(header.Time().Int64(), 0).UTC().String(),
+		LastCommitBitmap: hex.EncodeToString(header.LastCommitBitmap()),
 	}
+	sig := header.LastCommitSignature()
+	result.LastCommitSig = hex.EncodeToString(sig[:])
 	return result
 }