Add GetCurrentProposer API call

consensus/bor/api.go

@@ -87,3 +87,13 @@ func (api *API) GetSignersAtHash(hash common.Hash) ([]common.Address, error) {
 	}
 	return snap.signers(), nil
 }
+
+// GetSpan gets the current span details
+func (api *API) GetCurrentProposer() (common.Address, error) {
+	header := api.chain.CurrentHeader()
+	snap, err := api.bor.snapshot(api.chain, header.Number.Uint64(), header.Hash(), nil)
+	if err != nil {
+		return common.BytesToAddress(make([]byte, 20)), err
+	}
+	return snap.ValidatorSet.GetProposer().Address, nil
+}