rpc/api, xeth: added signTransaction method

SignTransaction creates a transaction but does submit it to the
network. SignTransaction returns a structure which includes the
transaction object details as well as the RLP encoded transaction that
could possibly be submitted by the SendRawTransaction method.

2 files changed, 61 insertions, 7 deletions

diff --git a/rpc/api/eth.go b/rpc/api/eth.go
index b84ae31da..db7a643d8 100644
--- a/rpc/api/eth.go
+++ b/rpc/api/eth.go
@@ -26,6 +26,7 @@ import (
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/common/natspec"
 	"github.com/ethereum/go-ethereum/eth"
+	"github.com/ethereum/go-ethereum/rlp"
 	"github.com/ethereum/go-ethereum/rpc/codec"
 	"github.com/ethereum/go-ethereum/rpc/shared"
 	"github.com/ethereum/go-ethereum/xeth"
@@ -70,8 +71,10 @@ var (
 		"eth_getCode":                             (*ethApi).GetData,
 		"eth_getNatSpec":                          (*ethApi).GetNatSpec,
 		"eth_sign":                                (*ethApi).Sign,
-		"eth_sendRawTransaction":                  (*ethApi).SendRawTransaction,
+		"eth_sendRawTransaction":                  (*ethApi).SubmitTransaction,
+		"eth_submitTransaction":                   (*ethApi).SubmitTransaction,
 		"eth_sendTransaction":                     (*ethApi).SendTransaction,
+		"eth_signTransaction":                     (*ethApi).SignTransaction,
 		"eth_transact":                            (*ethApi).SendTransaction,
 		"eth_estimateGas":                         (*ethApi).EstimateGas,
 		"eth_call":                                (*ethApi).Call,
@@ -285,7 +288,7 @@ func (self *ethApi) Sign(req *shared.Request) (interface{}, error) {
 	return v, nil
 }
 
-func (self *ethApi) SendRawTransaction(req *shared.Request) (interface{}, error) {
+func (self *ethApi) SubmitTransaction(req *shared.Request) (interface{}, error) {
 	args := new(NewDataArgs)
 	if err := self.codec.Decode(req.Params, &args); err != nil {
 		return nil, shared.NewDecodeParamError(err.Error())
@@ -298,6 +301,45 @@ func (self *ethApi) SendRawTransaction(req *shared.Request) (interface{}, error)
 	return v, nil
 }
 
+// JsonTransaction is returned as response by the JSON RPC. It contains the
+// signed RLP encoded transaction as Raw and the signed transaction object as Tx.
+type JsonTransaction struct {
+	Raw string `json:"raw"`
+	Tx  *tx    `json:"tx"`
+}
+
+func (self *ethApi) SignTransaction(req *shared.Request) (interface{}, error) {
+	args := new(NewTxArgs)
+	if err := self.codec.Decode(req.Params, &args); err != nil {
+		return nil, shared.NewDecodeParamError(err.Error())
+	}
+
+	// nonce may be nil ("guess" mode)
+	var nonce string
+	if args.Nonce != nil {
+		nonce = args.Nonce.String()
+	}
+
+	var gas, price string
+	if args.Gas != nil {
+		gas = args.Gas.String()
+	}
+	if args.GasPrice != nil {
+		price = args.GasPrice.String()
+	}
+	tx, err := self.xeth.SignTransaction(args.From, args.To, nonce, args.Value.String(), gas, price, args.Data)
+	if err != nil {
+		return nil, err
+	}
+
+	data, err := rlp.EncodeToBytes(tx)
+	if err != nil {
+		return nil, err
+	}
+
+	return JsonTransaction{"0x" + common.Bytes2Hex(data), newTx(tx)}, nil
+}
+
 func (self *ethApi) SendTransaction(req *shared.Request) (interface{}, error) {
 	args := new(NewTxArgs)
 	if err := self.codec.Decode(req.Params, &args); err != nil {
diff --git a/rpc/api/eth_js.go b/rpc/api/eth_js.go
index 75c103c9d..dfc104ad8 100644
--- a/rpc/api/eth_js.go
+++ b/rpc/api/eth_js.go
@@ -36,11 +36,23 @@ web3._extend({
 			params: 3,
 			inputFormatter: [web3._extend.formatters.inputTransactionFormatter, web3._extend.utils.fromDecimal, web3._extend.utils.fromDecimal]
 		}),
-    new web3._extend.Method({
-	    name: 'getNatSpec',
-	    call: 'eth_getNatSpec',
-	    params: 1,
-	    inputFormatter: [web3._extend.formatters.inputTransactionFormatter]
+		new web3._extend.Method({
+			name: 'getNatSpec',
+			call: 'eth_getNatSpec',
+			params: 1,
+			inputFormatter: [web3._extend.formatters.inputTransactionFormatter]
+		}),
+		new web3._extend.Method({
+			name: 'signTransaction',
+			call: 'eth_signTransaction',
+			params: 1,
+			inputFormatter: [web3._extend.formatters.inputTransactionFormatter]
+		}),
+		new web3._extend.Method({
+			name: 'submitTransaction',
+			call: 'eth_submitTransaction',
+			params: 1,
+			inputFormatter: [web3._extend.formatters.inputTransactionFormatter]
 		})
 	],
 	properties: