add: bor author api

consensus/bor/api.go

@@ -62,6 +62,23 @@ func (api *API) GetSnapshot(number *rpc.BlockNumber) (*Snapshot, error) {
 	return api.bor.snapshot(api.chain, header.Number.Uint64(), header.Hash(), nil)
 }
 
+// GetAuthor retrieves the author a block.
+func (api *API) GetAuthor(number *rpc.BlockNumber) (*common.Address, error) {
+	// Retrieve the requested block number (or current if none requested)
+	var header *types.Header
+	if number == nil || *number == rpc.LatestBlockNumber {
+		header = api.chain.CurrentHeader()
+	} else {
+		header = api.chain.GetHeaderByNumber(uint64(number.Int64()))
+	}
+	// Ensure we have an actually valid block and return its snapshot
+	if header == nil {
+		return nil, errUnknownBlock
+	}
+	author, err := api.bor.Author(header)
+	return &author, err
+}
+
 // GetSnapshotAtHash retrieves the state snapshot at a given block.
 func (api *API) GetSnapshotAtHash(hash common.Hash) (*Snapshot, error) {
 	header := api.chain.GetHeaderByHash(hash)

internal/web3ext/web3ext.go

@@ -129,6 +129,12 @@ web3._extend({
 			params: 1,
 			inputFormatter: [null]
 		}),
+		new web3._extend.Method({
+			name: 'getAuthor',
+			call: 'bor_getAuthor',
+			params: 1,
+			inputFormatter: [null]
+		}),
 		new web3._extend.Method({
 			name: 'getSnapshotAtHash',
 			call: 'bor_getSnapshotAtHash',