244 lines
7.1 KiB
Go
244 lines
7.1 KiB
Go
// Copyright 2018 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 rules
|
|
|
|
import (
|
|
"encoding/json"
|
|
"fmt"
|
|
"os"
|
|
"strings"
|
|
|
|
"github.com/dop251/goja"
|
|
"github.com/ethereum/go-ethereum/internal/ethapi"
|
|
"github.com/ethereum/go-ethereum/internal/jsre/deps"
|
|
"github.com/ethereum/go-ethereum/log"
|
|
"github.com/ethereum/go-ethereum/signer/core"
|
|
"github.com/ethereum/go-ethereum/signer/storage"
|
|
)
|
|
|
|
var (
|
|
BigNumber_JS = deps.MustAsset("bignumber.js")
|
|
)
|
|
|
|
// consoleOutput is an override for the console.log and console.error methods to
|
|
// stream the output into the configured output stream instead of stdout.
|
|
func consoleOutput(call goja.FunctionCall) goja.Value {
|
|
output := []string{"JS:> "}
|
|
for _, argument := range call.Arguments {
|
|
output = append(output, fmt.Sprintf("%v", argument))
|
|
}
|
|
fmt.Fprintln(os.Stderr, strings.Join(output, " "))
|
|
return goja.Undefined()
|
|
}
|
|
|
|
// rulesetUI provides an implementation of UIClientAPI that evaluates a javascript
|
|
// file for each defined UI-method
|
|
type rulesetUI struct {
|
|
next core.UIClientAPI // The next handler, for manual processing
|
|
storage storage.Storage
|
|
jsRules string // The rules to use
|
|
}
|
|
|
|
func NewRuleEvaluator(next core.UIClientAPI, jsbackend storage.Storage) (*rulesetUI, error) {
|
|
c := &rulesetUI{
|
|
next: next,
|
|
storage: jsbackend,
|
|
jsRules: "",
|
|
}
|
|
|
|
return c, nil
|
|
}
|
|
func (r *rulesetUI) RegisterUIServer(api *core.UIServerAPI) {
|
|
// TODO, make it possible to query from js
|
|
}
|
|
|
|
func (r *rulesetUI) Init(javascriptRules string) error {
|
|
r.jsRules = javascriptRules
|
|
return nil
|
|
}
|
|
func (r *rulesetUI) execute(jsfunc string, jsarg interface{}) (goja.Value, error) {
|
|
|
|
// Instantiate a fresh vm engine every time
|
|
vm := goja.New()
|
|
|
|
// Set the native callbacks
|
|
consoleObj := vm.NewObject()
|
|
consoleObj.Set("log", consoleOutput)
|
|
consoleObj.Set("error", consoleOutput)
|
|
vm.Set("console", consoleObj)
|
|
|
|
storageObj := vm.NewObject()
|
|
storageObj.Set("put", func(call goja.FunctionCall) goja.Value {
|
|
key, val := call.Argument(0).String(), call.Argument(1).String()
|
|
if val == "" {
|
|
r.storage.Del(key)
|
|
} else {
|
|
r.storage.Put(key, val)
|
|
}
|
|
return goja.Null()
|
|
})
|
|
storageObj.Set("get", func(call goja.FunctionCall) goja.Value {
|
|
goval, _ := r.storage.Get(call.Argument(0).String())
|
|
jsval := vm.ToValue(goval)
|
|
return jsval
|
|
})
|
|
vm.Set("storage", storageObj)
|
|
|
|
// Load bootstrap libraries
|
|
script, err := goja.Compile("bignumber.js", string(BigNumber_JS), true)
|
|
if err != nil {
|
|
log.Warn("Failed loading libraries", "err", err)
|
|
return goja.Undefined(), err
|
|
}
|
|
vm.RunProgram(script)
|
|
|
|
// Run the actual rule implementation
|
|
_, err = vm.RunString(r.jsRules)
|
|
if err != nil {
|
|
log.Warn("Execution failed", "err", err)
|
|
return goja.Undefined(), err
|
|
}
|
|
|
|
// And the actual call
|
|
// All calls are objects with the parameters being keys in that object.
|
|
// To provide additional insulation between js and go, we serialize it into JSON on the Go-side,
|
|
// and deserialize it on the JS side.
|
|
|
|
jsonbytes, err := json.Marshal(jsarg)
|
|
if err != nil {
|
|
log.Warn("failed marshalling data", "data", jsarg)
|
|
return goja.Undefined(), err
|
|
}
|
|
// Now, we call foobar(JSON.parse(<jsondata>)).
|
|
var call string
|
|
if len(jsonbytes) > 0 {
|
|
call = fmt.Sprintf("%v(JSON.parse(%v))", jsfunc, string(jsonbytes))
|
|
} else {
|
|
call = fmt.Sprintf("%v()", jsfunc)
|
|
}
|
|
return vm.RunString(call)
|
|
}
|
|
|
|
func (r *rulesetUI) checkApproval(jsfunc string, jsarg []byte, err error) (bool, error) {
|
|
if err != nil {
|
|
return false, err
|
|
}
|
|
v, err := r.execute(jsfunc, string(jsarg))
|
|
if err != nil {
|
|
log.Info("error occurred during execution", "error", err)
|
|
return false, err
|
|
}
|
|
result := v.ToString().String()
|
|
if result == "Approve" {
|
|
log.Info("Op approved")
|
|
return true, nil
|
|
} else if result == "Reject" {
|
|
log.Info("Op rejected")
|
|
return false, nil
|
|
}
|
|
return false, fmt.Errorf("unknown response")
|
|
}
|
|
|
|
func (r *rulesetUI) ApproveTx(request *core.SignTxRequest) (core.SignTxResponse, error) {
|
|
jsonreq, err := json.Marshal(request)
|
|
approved, err := r.checkApproval("ApproveTx", jsonreq, err)
|
|
if err != nil {
|
|
log.Info("Rule-based approval error, going to manual", "error", err)
|
|
return r.next.ApproveTx(request)
|
|
}
|
|
|
|
if approved {
|
|
return core.SignTxResponse{
|
|
Transaction: request.Transaction,
|
|
Approved: true},
|
|
nil
|
|
}
|
|
return core.SignTxResponse{Approved: false}, err
|
|
}
|
|
|
|
func (r *rulesetUI) ApproveSignData(request *core.SignDataRequest) (core.SignDataResponse, error) {
|
|
jsonreq, err := json.Marshal(request)
|
|
approved, err := r.checkApproval("ApproveSignData", jsonreq, err)
|
|
if err != nil {
|
|
log.Info("Rule-based approval error, going to manual", "error", err)
|
|
return r.next.ApproveSignData(request)
|
|
}
|
|
if approved {
|
|
return core.SignDataResponse{Approved: true}, nil
|
|
}
|
|
return core.SignDataResponse{Approved: false}, err
|
|
}
|
|
|
|
// OnInputRequired not handled by rules
|
|
func (r *rulesetUI) OnInputRequired(info core.UserInputRequest) (core.UserInputResponse, error) {
|
|
return r.next.OnInputRequired(info)
|
|
}
|
|
|
|
func (r *rulesetUI) ApproveListing(request *core.ListRequest) (core.ListResponse, error) {
|
|
jsonreq, err := json.Marshal(request)
|
|
approved, err := r.checkApproval("ApproveListing", jsonreq, err)
|
|
if err != nil {
|
|
log.Info("Rule-based approval error, going to manual", "error", err)
|
|
return r.next.ApproveListing(request)
|
|
}
|
|
if approved {
|
|
return core.ListResponse{Accounts: request.Accounts}, nil
|
|
}
|
|
return core.ListResponse{}, err
|
|
}
|
|
|
|
func (r *rulesetUI) ApproveNewAccount(request *core.NewAccountRequest) (core.NewAccountResponse, error) {
|
|
// This cannot be handled by rules, requires setting a password
|
|
// dispatch to next
|
|
return r.next.ApproveNewAccount(request)
|
|
}
|
|
|
|
func (r *rulesetUI) ShowError(message string) {
|
|
log.Error(message)
|
|
r.next.ShowError(message)
|
|
}
|
|
|
|
func (r *rulesetUI) ShowInfo(message string) {
|
|
log.Info(message)
|
|
r.next.ShowInfo(message)
|
|
}
|
|
|
|
func (r *rulesetUI) OnSignerStartup(info core.StartupInfo) {
|
|
jsonInfo, err := json.Marshal(info)
|
|
if err != nil {
|
|
log.Warn("failed marshalling data", "data", info)
|
|
return
|
|
}
|
|
r.next.OnSignerStartup(info)
|
|
_, err = r.execute("OnSignerStartup", string(jsonInfo))
|
|
if err != nil {
|
|
log.Info("error occurred during execution", "error", err)
|
|
}
|
|
}
|
|
|
|
func (r *rulesetUI) OnApprovedTx(tx ethapi.SignTransactionResult) {
|
|
jsonTx, err := json.Marshal(tx)
|
|
if err != nil {
|
|
log.Warn("failed marshalling transaction", "tx", tx)
|
|
return
|
|
}
|
|
_, err = r.execute("OnApprovedTx", string(jsonTx))
|
|
if err != nil {
|
|
log.Info("error occurred during execution", "error", err)
|
|
}
|
|
}
|