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// Copyright 2015 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
package rpc
import (
"encoding/json"
"fmt"
"github.com/ethereum/go-ethereum/cmd/utils"
"github.com/ethereum/go-ethereum/jsre"
"github.com/ethereum/go-ethereum/logger"
"github.com/ethereum/go-ethereum/logger/glog"
"github.com/ethereum/go-ethereum/rpc/comms"
"github.com/ethereum/go-ethereum/rpc/shared"
"github.com/ethereum/go-ethereum/rpc/useragent"
"github.com/ethereum/go-ethereum/xeth"
"github.com/robertkrimen/otto"
)
type Jeth struct {
ethApi shared.EthereumApi
re *jsre.JSRE
client comms.EthereumClient
fe xeth.Frontend
}
func NewJeth(ethApi shared.EthereumApi, re *jsre.JSRE, client comms.EthereumClient, fe xeth.Frontend) *Jeth {
return &Jeth{ethApi, re, client, fe}
}
func (self *Jeth) err(call otto.FunctionCall, code int, msg string, id interface{}) (response otto.Value) {
errObj := fmt.Sprintf("{\"message\": \"%s\", \"code\": %d}", msg, code)
retResponse := fmt.Sprintf("ret_response = JSON.parse('{\"jsonrpc\": \"%s\", \"id\": %v, \"error\": %s}');", shared.JsonRpcVersion, id, errObj)
call.Otto.Run("ret_error = " + errObj)
res, _ := call.Otto.Run(retResponse)
return res
}
func (self *Jeth) Send(call otto.FunctionCall) (response otto.Value) {
reqif, err := call.Argument(0).Export()
if err != nil {
return self.err(call, -32700, err.Error(), nil)
}
jsonreq, err := json.Marshal(reqif)
var reqs []shared.Request
batch := true
err = json.Unmarshal(jsonreq, &reqs)
if err != nil {
reqs = make([]shared.Request, 1)
err = json.Unmarshal(jsonreq, &reqs[0])
batch = false
}
call.Otto.Set("response_len", len(reqs))
call.Otto.Run("var ret_response = new Array(response_len);")
for i, req := range reqs {
var respif interface{}
err := self.client.Send(&req)
if err != nil {
return self.err(call, -32603, err.Error(), req.Id)
}
recv:
respif, err = self.client.Recv()
if err != nil {
return self.err(call, -32603, err.Error(), req.Id)
}
agentreq, isRequest := respif.(*shared.Request)
if isRequest {
self.handleRequest(agentreq)
goto recv // receive response after agent interaction
}
sucres, isSuccessResponse := respif.(*shared.SuccessResponse)
errres, isErrorResponse := respif.(*shared.ErrorResponse)
if !isSuccessResponse && !isErrorResponse {
return self.err(call, -32603, fmt.Sprintf("Invalid response type (%T)", respif), req.Id)
}
call.Otto.Set("ret_jsonrpc", shared.JsonRpcVersion)
call.Otto.Set("ret_id", req.Id)
var res []byte
if isSuccessResponse {
res, err = json.Marshal(sucres.Result)
} else if isErrorResponse {
res, err = json.Marshal(errres.Error)
}
call.Otto.Set("ret_result", string(res))
call.Otto.Set("response_idx", i)
response, err = call.Otto.Run(`
ret_response[response_idx] = { jsonrpc: ret_jsonrpc, id: ret_id, result: JSON.parse(ret_result) };
`)
}
if !batch {
call.Otto.Run("ret_response = ret_response[0];")
}
if call.Argument(1).IsObject() {
call.Otto.Set("callback", call.Argument(1))
call.Otto.Run(`
if (Object.prototype.toString.call(callback) == '[object Function]') {
callback(null, ret_response);
}
`)
}
return
}
// handleRequest will handle user agent requests by interacting with the user and sending
// the user response back to the geth service
func (self *Jeth) handleRequest(req *shared.Request) bool {
var err error
var args []interface{}
if err = json.Unmarshal(req.Params, &args); err != nil {
glog.V(logger.Info).Infof("Unable to parse agent request - %v\n", err)
return false
}
switch req.Method {
case useragent.AskPasswordMethod:
return self.askPassword(req.Id, req.Jsonrpc, args)
case useragent.ConfirmTransactionMethod:
return self.confirmTransaction(req.Id, req.Jsonrpc, args)
}
return false
}
// askPassword will ask the user to supply the password for a given account
func (self *Jeth) askPassword(id interface{}, jsonrpc string, args []interface{}) bool {
var err error
var passwd string
if len(args) >= 1 {
if account, ok := args[0].(string); ok {
fmt.Printf("Unlock account %s\n", account)
passwd, err = utils.PromptPassword("Passphrase: ", true)
} else {
return false
}
}
if err = self.client.Send(shared.NewRpcResponse(id, jsonrpc, passwd, err)); err != nil {
glog.V(logger.Info).Infof("Unable to send user agent ask password response - %v\n", err)
}
return err == nil
}
func (self *Jeth) confirmTransaction(id interface{}, jsonrpc string, args []interface{}) bool {
// Accept all tx which are send from this console
return self.client.Send(shared.NewRpcResponse(id, jsonrpc, true, nil)) == nil
}
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