fix EIP55Checksum function (#175)

address/address.go

@@ -56,12 +56,25 @@ func EIP55Checksum(unchecksummed string) (string, error) {
 	return "0x" + val, nil
 }
 
-func ToEIP55ByCoinID(str string, coinID uint) (string, error) {
-	switch coinID {
-	case coin.ETHEREUM, coin.POA, coin.CLASSIC, coin.TOMOCHAIN, coin.CALLISTO,
-		coin.THUNDERTOKEN, coin.GOCHAIN, coin.WANCHAIN:
-		return EIP55Checksum(str)
-	default:
+func ToEIP55ByCoinID(str string, coinID uint) (eip55Addr string, err error) {
+	if !coin.IsEVM(coinID) {
 		return str, nil
 	}
+
+	// special case for ronin addresses
+	const roninPrefix, hexPrefix = "ronin:", "0x"
+	if coinID == coin.RONIN && strings.HasPrefix(str, roninPrefix) {
+		str = hexPrefix + str[len(roninPrefix):]
+		defer func() {
+			// remove 0x prefix, then add roninPrefix
+			eip55Addr = roninPrefix + eip55Addr[len(hexPrefix):]
+		}()
+	}
+
+	eip55Addr, err = EIP55Checksum(str)
+	if err != nil {
+		return "", err
+	}
+
+	return
 }

address/address_test.go

@@ -4,6 +4,7 @@ import (
 	"testing"
 
 	"github.com/stretchr/testify/assert"
+
 	"github.com/trustwallet/go-primitives/coin"
 )
 
@@ -68,7 +69,11 @@ func TestToEIP55ByCoinID(t *testing.T) {
 		wanAddrLowercase             = "0xae96137e0e05681ed2f5d1af272c3ee512939d0f"
 		wanAddrEIP55Checksum         = "0xAe96137E0e05681eD2F5D1AF272C3ee512939D0F"
 		wanAddrEIP55ChecksumWanchain = "0xAe96137E0e05681eD2F5D1AF272C3ee512939D0F"
-		tests                        = []struct {
+
+		roninAddr      = "ronin:ea674fdde714fd979de3edf0f56aa9716b898ec8"
+		roninAddrEIP55 = "ronin:EA674fdDe714fd979de3EdF0F56AA9716B898ec8"
+
+		tests = []struct {
 			name, address, expectedAddress string
 			coinID                         uint
 		}{
@@ -84,6 +89,8 @@ func TestToEIP55ByCoinID(t *testing.T) {
 			{"Wanchain 2", wanAddrEIP55Checksum, wanAddrEIP55ChecksumWanchain, coin.WANCHAIN},
 			{"Non Ethereum like chain 1", "", "", coin.TRON},
 			{"Non Ethereum like chain 2", addr1, addr1, coin.BINANCE},
+			{"SmartChain", addr1, addr1EIP55, coin.SMARTCHAIN},
+			{"Ronin", roninAddr, roninAddrEIP55, coin.RONIN},
 		}
 	)