mirror of https://github.com/ethereum/go-ethereum
Jeffrey Wilcke
9 years ago
commit
28b14d3e6d
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// Copyright 2015 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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// package user agent provides frontends and agents which can interact with the user
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package useragent |
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var ( |
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AskPasswordMethod = "agent_askPassword" |
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ConfirmTransactionMethod = "agent_confirmTransaction" |
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EnableUserAgentMethod = "admin_enableUserAgent" |
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) |
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@ -0,0 +1,141 @@ |
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// Copyright 2015 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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package useragent |
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import ( |
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"encoding/json" |
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"fmt" |
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"net" |
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"github.com/ethereum/go-ethereum/accounts" |
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"github.com/ethereum/go-ethereum/common" |
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"github.com/ethereum/go-ethereum/logger" |
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"github.com/ethereum/go-ethereum/logger/glog" |
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"github.com/ethereum/go-ethereum/rpc/shared" |
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) |
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// remoteFrontend implements xeth.Frontend and will communicate with an external
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// user agent over a connection
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type RemoteFrontend struct { |
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enabled bool |
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mgr *accounts.Manager |
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d *json.Decoder |
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e *json.Encoder |
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n int |
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} |
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// NewRemoteFrontend creates a new frontend which will interact with an user agent
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// over the given connection
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func NewRemoteFrontend(conn net.Conn, mgr *accounts.Manager) *RemoteFrontend { |
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return &RemoteFrontend{false, mgr, json.NewDecoder(conn), json.NewEncoder(conn), 0} |
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} |
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// Enable will enable user interaction
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func (fe *RemoteFrontend) Enable() { |
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fe.enabled = true |
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} |
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// UnlockAccount asks the user agent for the user password and tries to unlock the account.
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// It will try 3 attempts before giving up.
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func (fe *RemoteFrontend) UnlockAccount(address []byte) bool { |
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if !fe.enabled { |
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return false |
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} |
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err := fe.send(AskPasswordMethod, common.Bytes2Hex(address)) |
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if err != nil { |
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glog.V(logger.Error).Infof("Unable to send password request to agent - %v\n", err) |
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return false |
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} |
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passwdRes, err := fe.recv() |
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if err != nil { |
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glog.V(logger.Error).Infof("Unable to recv password response from agent - %v\n", err) |
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return false |
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} |
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if passwd, ok := passwdRes.Result.(string); ok { |
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err = fe.mgr.Unlock(common.BytesToAddress(address), passwd) |
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} |
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if err == nil { |
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return true |
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} |
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glog.V(logger.Debug).Infoln("3 invalid account unlock attempts") |
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return false |
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} |
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// ConfirmTransaction asks the user for approval
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func (fe *RemoteFrontend) ConfirmTransaction(tx string) bool { |
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if !fe.enabled { |
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return true // backwards compatibility
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} |
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err := fe.send(ConfirmTransactionMethod, tx) |
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if err != nil { |
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glog.V(logger.Error).Infof("Unable to send tx confirmation request to agent - %v\n", err) |
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return false |
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} |
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confirmResponse, err := fe.recv() |
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if err != nil { |
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glog.V(logger.Error).Infof("Unable to recv tx confirmation response from agent - %v\n", err) |
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return false |
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} |
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if confirmed, ok := confirmResponse.Result.(bool); ok { |
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return confirmed |
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} |
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return false |
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} |
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// send request to the agent
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func (fe *RemoteFrontend) send(method string, params ...interface{}) error { |
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fe.n += 1 |
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p, err := json.Marshal(params) |
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if err != nil { |
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glog.V(logger.Info).Infof("Unable to send agent request %v\n", err) |
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return err |
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} |
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req := shared.Request{ |
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Method: method, |
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Jsonrpc: shared.JsonRpcVersion, |
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Id: fe.n, |
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Params: p, |
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} |
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return fe.e.Encode(&req) |
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} |
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// recv user response from agent
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func (fe *RemoteFrontend) recv() (*shared.SuccessResponse, error) { |
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var res json.RawMessage |
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if err := fe.d.Decode(&res); err != nil { |
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return nil, err |
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} |
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var response shared.SuccessResponse |
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if err := json.Unmarshal(res, &response); err == nil { |
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return &response, nil |
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} |
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return nil, fmt.Errorf("Invalid user agent response") |
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} |
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