From 51dd117a3423504c12c16e23834d97a45f1b5359 Mon Sep 17 00:00:00 2001
From: ia <isaac.ardis@gmail.com>
Date: Fri, 18 Aug 2017 07:45:43 -0500
Subject: [PATCH] eth,internal: add eth_chainId method to PublicEthereumApi
 JSONRPC

---
 eth/api.go                  | 5 +++++
 internal/web3ext/web3ext.go | 5 +++++
 2 files changed, 10 insertions(+)

diff --git a/eth/api.go b/eth/api.go
index 708f75a784..7bb6847b49 100644
--- a/eth/api.go
+++ b/eth/api.go
@@ -67,6 +67,11 @@ func (api *PublicEthereumAPI) Hashrate() hexutil.Uint64 {
 	return hexutil.Uint64(api.e.Miner().HashRate())
 }
 
+// ChainId is the EIP-155 replay-protection chain id for the current ethereum chain config.
+func (api *PublicEthereumAPI) ChainId() *big.Int {
+	return api.e.chainConfig.ChainId
+}
+
 // PublicMinerAPI provides an API to control the miner.
 // It offers only methods that operate on data that pose no security risk when it is publicly accessible.
 type PublicMinerAPI struct {
diff --git a/internal/web3ext/web3ext.go b/internal/web3ext/web3ext.go
index f4eb47a12a..bf4b7808f7 100644
--- a/internal/web3ext/web3ext.go
+++ b/internal/web3ext/web3ext.go
@@ -433,6 +433,11 @@ const Eth_JS = `
 web3._extend({
 	property: 'eth',
 	methods: [
+		new web3._extend.Method({
+			name: 'chainId',
+			call: 'eth_chainId',
+			params: 0
+		}),
 		new web3._extend.Method({
 			name: 'sign',
 			call: 'eth_sign',