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