mirror of https://github.com/ethereum/go-ethereum
Jeffrey Wilcke
9 years ago
commit
28b14d3e6d
@ -0,0 +1,24 @@ |
||||
// 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 user agent provides frontends and agents which can interact with the user
|
||||
package useragent |
||||
|
||||
var ( |
||||
AskPasswordMethod = "agent_askPassword" |
||||
ConfirmTransactionMethod = "agent_confirmTransaction" |
||||
EnableUserAgentMethod = "admin_enableUserAgent" |
||||
) |
||||
@ -0,0 +1,141 @@ |
||||
// 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 useragent |
||||
|
||||
import ( |
||||
"encoding/json" |
||||
"fmt" |
||||
"net" |
||||
|
||||
"github.com/ethereum/go-ethereum/accounts" |
||||
"github.com/ethereum/go-ethereum/common" |
||||
"github.com/ethereum/go-ethereum/logger" |
||||
"github.com/ethereum/go-ethereum/logger/glog" |
||||
"github.com/ethereum/go-ethereum/rpc/shared" |
||||
) |
||||
|
||||
// remoteFrontend implements xeth.Frontend and will communicate with an external
|
||||
// user agent over a connection
|
||||
type RemoteFrontend struct { |
||||
enabled bool |
||||
mgr *accounts.Manager |
||||
d *json.Decoder |
||||
e *json.Encoder |
||||
n int |
||||
} |
||||
|
||||
// NewRemoteFrontend creates a new frontend which will interact with an user agent
|
||||
// over the given connection
|
||||
func NewRemoteFrontend(conn net.Conn, mgr *accounts.Manager) *RemoteFrontend { |
||||
return &RemoteFrontend{false, mgr, json.NewDecoder(conn), json.NewEncoder(conn), 0} |
||||
} |
||||
|
||||
// Enable will enable user interaction
|
||||
func (fe *RemoteFrontend) Enable() { |
||||
fe.enabled = true |
||||
} |
||||
|
||||
// UnlockAccount asks the user agent for the user password and tries to unlock the account.
|
||||
// It will try 3 attempts before giving up.
|
||||
func (fe *RemoteFrontend) UnlockAccount(address []byte) bool { |
||||
if !fe.enabled { |
||||
return false |
||||
} |
||||
|
||||
err := fe.send(AskPasswordMethod, common.Bytes2Hex(address)) |
||||
if err != nil { |
||||
glog.V(logger.Error).Infof("Unable to send password request to agent - %v\n", err) |
||||
return false |
||||
} |
||||
|
||||
passwdRes, err := fe.recv() |
||||
if err != nil { |
||||
glog.V(logger.Error).Infof("Unable to recv password response from agent - %v\n", err) |
||||
return false |
||||
} |
||||
|
||||
if passwd, ok := passwdRes.Result.(string); ok { |
||||
err = fe.mgr.Unlock(common.BytesToAddress(address), passwd) |
||||
} |
||||
|
||||
if err == nil { |
||||
return true |
||||
} |
||||
|
||||
glog.V(logger.Debug).Infoln("3 invalid account unlock attempts") |
||||
return false |
||||
} |
||||
|
||||
// ConfirmTransaction asks the user for approval
|
||||
func (fe *RemoteFrontend) ConfirmTransaction(tx string) bool { |
||||
if !fe.enabled { |
||||
return true // backwards compatibility
|
||||
} |
||||
|
||||
err := fe.send(ConfirmTransactionMethod, tx) |
||||
if err != nil { |
||||
glog.V(logger.Error).Infof("Unable to send tx confirmation request to agent - %v\n", err) |
||||
return false |
||||
} |
||||
|
||||
confirmResponse, err := fe.recv() |
||||
if err != nil { |
||||
glog.V(logger.Error).Infof("Unable to recv tx confirmation response from agent - %v\n", err) |
||||
return false |
||||
} |
||||
|
||||
if confirmed, ok := confirmResponse.Result.(bool); ok { |
||||
return confirmed |
||||
} |
||||
|
||||
return false |
||||
} |
||||
|
||||
// send request to the agent
|
||||
func (fe *RemoteFrontend) send(method string, params ...interface{}) error { |
||||
fe.n += 1 |
||||
|
||||
p, err := json.Marshal(params) |
||||
if err != nil { |
||||
glog.V(logger.Info).Infof("Unable to send agent request %v\n", err) |
||||
return err |
||||
} |
||||
|
||||
req := shared.Request{ |
||||
Method: method, |
||||
Jsonrpc: shared.JsonRpcVersion, |
||||
Id: fe.n, |
||||
Params: p, |
||||
} |
||||
|
||||
return fe.e.Encode(&req) |
||||
} |
||||
|
||||
// recv user response from agent
|
||||
func (fe *RemoteFrontend) recv() (*shared.SuccessResponse, error) { |
||||
var res json.RawMessage |
||||
if err := fe.d.Decode(&res); err != nil { |
||||
return nil, err |
||||
} |
||||
|
||||
var response shared.SuccessResponse |
||||
if err := json.Unmarshal(res, &response); err == nil { |
||||
return &response, nil |
||||
} |
||||
|
||||
return nil, fmt.Errorf("Invalid user agent response") |
||||
} |
||||
Loading…
Reference in new issue