1 files changed, 84 insertions, 0 deletions
diff --git a/rpc/api/web3.go b/rpc/api/web3.go
new file mode 100644
index 000000000..4c51c4a97
--- /dev/null
+++ b/rpc/api/web3.go
@@ -0,0 +1,84 @@
+package api
+
+import (
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/crypto"
+	"github.com/ethereum/go-ethereum/rpc/codec"
+	"github.com/ethereum/go-ethereum/rpc/shared"
+	"github.com/ethereum/go-ethereum/xeth"
+)
+
+const (
+	Web3Version = "1.0.0"
+)
+
+var (
+// mapping between methods and handlers
+	Web3Mapping = map[string]web3handler{
+		"web3_sha3":          (*web3).Sha3,
+		"web3_clientVersion": (*web3).ClientVersion,
+	}
+)
+
+// web3 callback handler
+type web3handler func(*web3, *shared.Request) (interface{}, error)
+
+// web3 api provider
+type web3 struct {
+	xeth    *xeth.XEth
+	methods map[string]web3handler
+	codec   codec.ApiCoder
+}
+
+// create a new web3 api instance
+func NewWeb3(xeth *xeth.XEth, coder codec.Codec) *web3 {
+	return &web3{
+		xeth:    xeth,
+		methods: Web3Mapping,
+		codec:   coder.New(nil),
+	}
+}
+
+// collection with supported methods
+func (self *web3) Methods() []string {
+	methods := make([]string, len(self.methods))
+	i := 0
+	for k := range self.methods {
+		methods[i] = k
+		i++
+	}
+	return methods
+}
+
+// Execute given request
+func (self *web3) Execute(req *shared.Request) (interface{}, error) {
+	if callback, ok := self.methods[req.Method]; ok {
+		return callback(self, req)
+	}
+
+	return nil, &shared.NotImplementedError{req.Method}
+}
+
+func (self *web3) Name() string {
+	return Web3ApiName
+}
+
+// Version of the API this instance provides
+func (self *web3) Version() string {
+	return Web3Version
+}
+
+// Calculates the sha3 over req.Params.Data
+func (self *web3) Sha3(req *shared.Request) (interface{}, error) {
+	args := new(Sha3Args)
+	if err := self.codec.Decode(req.Params, &args); err != nil {
+		return nil, err
+	}
+
+	return common.ToHex(crypto.Sha3(common.FromHex(args.Data))), nil
+}
+
+// returns the xeth client vrsion
+func (self *web3) ClientVersion(req *shared.Request) (interface{}, error) {
+	return self.xeth.ClientVersion(), nil
+}