cmd/clef, signer: initial poc of the standalone signer (#16154)

* signer: introduce external signer command

* cmd/signer, rpc: Implement new signer. Add info about remote user to Context

* signer: refactored request/response, made use of urfave.cli

* cmd/signer: Use common flags

* cmd/signer: methods to validate calldata against abi

* cmd/signer: work on abi parser

* signer: add mutex around UI

* cmd/signer: add json 4byte directory, remove passwords from api

* cmd/signer: minor changes

* cmd/signer: Use ErrRequestDenied, enable lightkdf

* cmd/signer: implement tests

* cmd/signer: made possible for UI to modify tx parameters

* cmd/signer: refactors, removed channels in ui comms, added UI-api via stdin/out

* cmd/signer: Made lowercase json-definitions, added UI-signer test functionality

* cmd/signer: update documentation

* cmd/signer: fix bugs, improve abi detection, abi argument display

* cmd/signer: minor change in json format

* cmd/signer: rework json communication

* cmd/signer: implement mixcase addresses in API, fix json id bug

* cmd/signer: rename fromaccount, update pythonpoc with new json encoding format

* cmd/signer: make use of new abi interface

* signer: documentation

* signer/main: remove redundant  option

* signer: implement audit logging

* signer: create package 'signer', minor changes

* common: add 0x-prefix to mixcaseaddress in json marshalling + validation

* signer, rules, storage: implement rules + ephemeral storage for signer rules

* signer: implement OnApprovedTx, change signing response (API BREAKAGE)

* signer: refactoring + documentation

* signer/rules: implement dispatching to next handler

* signer: docs

* signer/rules: hide json-conversion from users, ensure context is cleaned

* signer: docs

* signer: implement validation rules, change signature of call_info

* signer: fix log flaw with string pointer

* signer: implement custom 4byte databsae that saves submitted signatures

* signer/storage: implement aes-gcm-backed credential storage

* accounts: implement json unmarshalling of url

* signer: fix listresponse, fix gas->uint64

* node: make http/ipc start methods public

* signer: add ipc capability+review concerns

* accounts: correct docstring

* signer: address review concerns

* rpc: go fmt -s

* signer: review concerns+ baptize Clef

* signer,node: move Start-functions to separate file

* signer: formatting

5 files changed, 1139 insertions, 0 deletions

diff --git a/signer/rules/deps/bignumber.js b/signer/rules/deps/bignumber.js
new file mode 100644
index 000000000..17c8851e2
--- /dev/null
+++ b/signer/rules/deps/bignumber.js
@@ -0,0 +1,4 @@
+/* bignumber.js v2.0.3 https://github.com/MikeMcl/bignumber.js/LICENCE */
+/* modified by zelig to fix https://github.com/robertkrimen/otto#regular-expression-incompatibility */
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+//# sourceMappingURL=doc/bignumber.js.map
diff --git a/signer/rules/deps/bindata.go b/signer/rules/deps/bindata.go
new file mode 100644
index 000000000..0b27f4517
--- /dev/null
+++ b/signer/rules/deps/bindata.go
@@ -0,0 +1,235 @@
+// Code generated by go-bindata.
+// sources:
+// bignumber.js
+// DO NOT EDIT!
+
+package deps
+
+import (
+	"bytes"
+	"compress/gzip"
+	"fmt"
+	"io"
+	"io/ioutil"
+	"os"
+	"path/filepath"
+	"strings"
+	"time"
+)
+
+func bindataRead(data []byte, name string) ([]byte, error) {
+	gz, err := gzip.NewReader(bytes.NewBuffer(data))
+	if err != nil {
+		return nil, fmt.Errorf("Read %q: %v", name, err)
+	}
+
+	var buf bytes.Buffer
+	_, err = io.Copy(&buf, gz)
+	clErr := gz.Close()
+
+	if err != nil {
+		return nil, fmt.Errorf("Read %q: %v", name, err)
+	}
+	if clErr != nil {
+		return nil, err
+	}
+
+	return buf.Bytes(), nil
+}
+
+type asset struct {
+	bytes []byte
+	info  os.FileInfo
+}
+
+type bindataFileInfo struct {
+	name    string
+	size    int64
+	mode    os.FileMode
+	modTime time.Time
+}
+
+func (fi bindataFileInfo) Name() string {
+	return fi.name
+}
+func (fi bindataFileInfo) Size() int64 {
+	return fi.size
+}
+func (fi bindataFileInfo) Mode() os.FileMode {
+	return fi.mode
+}
+func (fi bindataFileInfo) ModTime() time.Time {
+	return fi.modTime
+}
+func (fi bindataFileInfo) IsDir() bool {
+	return false
+}
+func (fi bindataFileInfo) Sys() interface{} {
+	return nil
+}
+
+var _bignumberJs = 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+
+func bignumberJsBytes() ([]byte, error) {
+	return bindataRead(
+		_bignumberJs,
+		"bignumber.js",
+	)
+}
+
+func bignumberJs() (*asset, error) {
+	bytes, err := bignumberJsBytes()
+	if err != nil {
+		return nil, err
+	}
+
+	info := bindataFileInfo{name: "bignumber.js", size: 0, mode: os.FileMode(0), modTime: time.Unix(0, 0)}
+	a := &asset{bytes: bytes, info: info}
+	return a, nil
+}
+
+// Asset loads and returns the asset for the given name.
+// It returns an error if the asset could not be found or
+// could not be loaded.
+func Asset(name string) ([]byte, error) {
+	cannonicalName := strings.Replace(name, "\\", "/", -1)
+	if f, ok := _bindata[cannonicalName]; ok {
+		a, err := f()
+		if err != nil {
+			return nil, fmt.Errorf("Asset %s can't read by error: %v", name, err)
+		}
+		return a.bytes, nil
+	}
+	return nil, fmt.Errorf("Asset %s not found", name)
+}
+
+// MustAsset is like Asset but panics when Asset would return an error.
+// It simplifies safe initialization of global variables.
+func MustAsset(name string) []byte {
+	a, err := Asset(name)
+	if err != nil {
+		panic("asset: Asset(" + name + "): " + err.Error())
+	}
+
+	return a
+}
+
+// AssetInfo loads and returns the asset info for the given name.
+// It returns an error if the asset could not be found or
+// could not be loaded.
+func AssetInfo(name string) (os.FileInfo, error) {
+	cannonicalName := strings.Replace(name, "\\", "/", -1)
+	if f, ok := _bindata[cannonicalName]; ok {
+		a, err := f()
+		if err != nil {
+			return nil, fmt.Errorf("AssetInfo %s can't read by error: %v", name, err)
+		}
+		return a.info, nil
+	}
+	return nil, fmt.Errorf("AssetInfo %s not found", name)
+}
+
+// AssetNames returns the names of the assets.
+func AssetNames() []string {
+	names := make([]string, 0, len(_bindata))
+	for name := range _bindata {
+		names = append(names, name)
+	}
+	return names
+}
+
+// _bindata is a table, holding each asset generator, mapped to its name.
+var _bindata = map[string]func() (*asset, error){
+	"bignumber.js": bignumberJs,
+}
+
+// AssetDir returns the file names below a certain
+// directory embedded in the file by go-bindata.
+// For example if you run go-bindata on data/... and data contains the
+// following hierarchy:
+//     data/
+//       foo.txt
+//       img/
+//         a.png
+//         b.png
+// then AssetDir("data") would return []string{"foo.txt", "img"}
+// AssetDir("data/img") would return []string{"a.png", "b.png"}
+// AssetDir("foo.txt") and AssetDir("notexist") would return an error
+// AssetDir("") will return []string{"data"}.
+func AssetDir(name string) ([]string, error) {
+	node := _bintree
+	if len(name) != 0 {
+		cannonicalName := strings.Replace(name, "\\", "/", -1)
+		pathList := strings.Split(cannonicalName, "/")
+		for _, p := range pathList {
+			node = node.Children[p]
+			if node == nil {
+				return nil, fmt.Errorf("Asset %s not found", name)
+			}
+		}
+	}
+	if node.Func != nil {
+		return nil, fmt.Errorf("Asset %s not found", name)
+	}
+	rv := make([]string, 0, len(node.Children))
+	for childName := range node.Children {
+		rv = append(rv, childName)
+	}
+	return rv, nil
+}
+
+type bintree struct {
+	Func     func() (*asset, error)
+	Children map[string]*bintree
+}
+
+var _bintree = &bintree{nil, map[string]*bintree{
+	"bignumber.js": {bignumberJs, map[string]*bintree{}},
+}}
+
+// RestoreAsset restores an asset under the given directory
+func RestoreAsset(dir, name string) error {
+	data, err := Asset(name)
+	if err != nil {
+		return err
+	}
+	info, err := AssetInfo(name)
+	if err != nil {
+		return err
+	}
+	err = os.MkdirAll(_filePath(dir, filepath.Dir(name)), os.FileMode(0755))
+	if err != nil {
+		return err
+	}
+	err = ioutil.WriteFile(_filePath(dir, name), data, info.Mode())
+	if err != nil {
+		return err
+	}
+	err = os.Chtimes(_filePath(dir, name), info.ModTime(), info.ModTime())
+	if err != nil {
+		return err
+	}
+	return nil
+}
+
+// RestoreAssets restores an asset under the given directory recursively
+func RestoreAssets(dir, name string) error {
+	children, err := AssetDir(name)
+	// File
+	if err != nil {
+		return RestoreAsset(dir, name)
+	}
+	// Dir
+	for _, child := range children {
+		err = RestoreAssets(dir, filepath.Join(name, child))
+		if err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+func _filePath(dir, name string) string {
+	cannonicalName := strings.Replace(name, "\\", "/", -1)
+	return filepath.Join(append([]string{dir}, strings.Split(cannonicalName, "/")...)...)
+}
diff --git a/signer/rules/deps/deps.go b/signer/rules/deps/deps.go
new file mode 100644
index 000000000..5ee00b900
--- /dev/null
+++ b/signer/rules/deps/deps.go
@@ -0,0 +1,21 @@
+// 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 deps contains the console JavaScript dependencies Go embedded.
+package deps
+
+//go:generate go-bindata -nometadata -pkg deps -o bindata.go bignumber.js
+//go:generate gofmt -w -s bindata.go
diff --git a/signer/rules/rules.go b/signer/rules/rules.go
new file mode 100644
index 000000000..fa270436d
--- /dev/null
+++ b/signer/rules/rules.go
@@ -0,0 +1,248 @@
+// Copyright 2018 The go-ethereum Authors
+// This file is part of go-ethereum.
+//
+// go-ethereum is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// go-ethereum 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 General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with go-ethereum. If not, see <http://www.gnu.org/licenses/>.
+
+package rules
+
+import (
+	"encoding/json"
+	"fmt"
+	"os"
+	"strings"
+
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/internal/ethapi"
+	"github.com/ethereum/go-ethereum/log"
+	"github.com/ethereum/go-ethereum/signer/core"
+	"github.com/ethereum/go-ethereum/signer/rules/deps"
+	"github.com/ethereum/go-ethereum/signer/storage"
+	"github.com/robertkrimen/otto"
+)
+
+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 otto.FunctionCall) otto.Value {
+	output := []string{"JS:> "}
+	for _, argument := range call.ArgumentList {
+		output = append(output, fmt.Sprintf("%v", argument))
+	}
+	fmt.Fprintln(os.Stdout, strings.Join(output, " "))
+	return otto.Value{}
+}
+
+// rulesetUi provides an implementation of SignerUI that evaluates a javascript
+// file for each defined UI-method
+type rulesetUi struct {
+	next        core.SignerUI // The next handler, for manual processing
+	storage     storage.Storage
+	credentials storage.Storage
+	jsRules     string // The rules to use
+}
+
+func NewRuleEvaluator(next core.SignerUI, jsbackend, credentialsBackend storage.Storage) (*rulesetUi, error) {
+	c := &rulesetUi{
+		next:        next,
+		storage:     jsbackend,
+		credentials: credentialsBackend,
+		jsRules:     "",
+	}
+
+	return c, nil
+}
+
+func (r *rulesetUi) Init(javascriptRules string) error {
+	r.jsRules = javascriptRules
+	return nil
+}
+func (r *rulesetUi) execute(jsfunc string, jsarg interface{}) (otto.Value, error) {
+
+	// Instantiate a fresh vm engine every time
+	vm := otto.New()
+	// Set the native callbacks
+	consoleObj, _ := vm.Get("console")
+	consoleObj.Object().Set("log", consoleOutput)
+	consoleObj.Object().Set("error", consoleOutput)
+	vm.Set("storage", r.storage)
+
+	// Load bootstrap libraries
+	script, err := vm.Compile("bignumber.js", BigNumber_JS)
+	if err != nil {
+		log.Warn("Failed loading libraries", "err", err)
+		return otto.UndefinedValue(), err
+	}
+	vm.Run(script)
+
+	// Run the actual rule implementation
+	_, err = vm.Run(r.jsRules)
+	if err != nil {
+		log.Warn("Execution failed", "err", err)
+		return otto.UndefinedValue(), 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 otto.UndefinedValue(), 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.Run(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, err := v.ToString()
+	if err != nil {
+		log.Info("error occurred during response unmarshalling", "error", err)
+		return false, err
+	}
+	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,
+				Password:    r.lookupPassword(request.Transaction.From.Address()),
+			},
+			nil
+	}
+	return core.SignTxResponse{Approved: false}, err
+}
+
+func (r *rulesetUi) lookupPassword(address common.Address) string {
+	return r.credentials.Get(strings.ToLower(address.String()))
+}
+
+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, Password: r.lookupPassword(request.Address.Address())}, nil
+	}
+	return core.SignDataResponse{Approved: false, Password: ""}, err
+}
+
+func (r *rulesetUi) ApproveExport(request *core.ExportRequest) (core.ExportResponse, error) {
+	jsonreq, err := json.Marshal(request)
+	approved, err := r.checkApproval("ApproveExport", jsonreq, err)
+	if err != nil {
+		log.Info("Rule-based approval error, going to manual", "error", err)
+		return r.next.ApproveExport(request)
+	}
+	if approved {
+		return core.ExportResponse{Approved: true}, nil
+	}
+	return core.ExportResponse{Approved: false}, err
+}
+
+func (r *rulesetUi) ApproveImport(request *core.ImportRequest) (core.ImportResponse, error) {
+	// This cannot be handled by rules, requires setting a password
+	// dispatch to next
+	return r.next.ApproveImport(request)
+}
+
+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)
+	}
+}
diff --git a/signer/rules/rules_test.go b/signer/rules/rules_test.go
new file mode 100644
index 000000000..6a0403500
--- /dev/null
+++ b/signer/rules/rules_test.go
@@ -0,0 +1,631 @@
+// Copyright 2018 The go-ethereum Authors
+// This file is part of go-ethereum.
+//
+// go-ethereum is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// go-ethereum 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 General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with go-ethereum. If not, see <http://www.gnu.org/licenses/>.
+//
+package rules
+
+import (
+	"fmt"
+	"math/big"
+	"strings"
+	"testing"
+
+	"github.com/ethereum/go-ethereum/accounts"
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/common/hexutil"
+	"github.com/ethereum/go-ethereum/core/types"
+	"github.com/ethereum/go-ethereum/internal/ethapi"
+	"github.com/ethereum/go-ethereum/signer/core"
+	"github.com/ethereum/go-ethereum/signer/storage"
+)
+
+const JS = `
+/**
+This is an example implementation of a Javascript rule file. 
+
+When the signer receives a request over the external API, the corresponding method is evaluated. 
+Three things can happen: 
+
+1. The method returns "Approve". This means the operation is permitted. 
+2. The method returns "Reject". This means the operation is rejected. 
+3. Anything else; other return values [*], method not implemented or exception occurred during processing. This means
+that the operation will continue to manual processing, via the regular UI method chosen by the user. 
+
+[*] Note: Future version of the ruleset may use more complex json-based returnvalues, making it possible to not 
+only respond Approve/Reject/Manual, but also modify responses. For example, choose to list only one, but not all 
+accounts in a list-request. The points above will continue to hold for non-json based responses ("Approve"/"Reject").
+
+**/
+
+function ApproveListing(request){
+	console.log("In js approve listing");
+	console.log(request.accounts[3].Address)
+	console.log(request.meta.Remote)
+	return "Approve"
+}
+
+function ApproveTx(request){
+	console.log("test");
+	console.log("from");
+	return "Reject";
+}
+
+function test(thing){
+	console.log(thing.String())
+}
+
+`
+
+func mixAddr(a string) (*common.MixedcaseAddress, error) {
+	return common.NewMixedcaseAddressFromString(a)
+}
+
+type alwaysDenyUi struct{}
+
+func (alwaysDenyUi) OnSignerStartup(info core.StartupInfo) {
+}
+
+func (alwaysDenyUi) ApproveTx(request *core.SignTxRequest) (core.SignTxResponse, error) {
+	return core.SignTxResponse{Transaction: request.Transaction, Approved: false, Password: ""}, nil
+}
+
+func (alwaysDenyUi) ApproveSignData(request *core.SignDataRequest) (core.SignDataResponse, error) {
+	return core.SignDataResponse{Approved: false, Password: ""}, nil
+}
+
+func (alwaysDenyUi) ApproveExport(request *core.ExportRequest) (core.ExportResponse, error) {
+	return core.ExportResponse{Approved: false}, nil
+}
+
+func (alwaysDenyUi) ApproveImport(request *core.ImportRequest) (core.ImportResponse, error) {
+	return core.ImportResponse{Approved: false, OldPassword: "", NewPassword: ""}, nil
+}
+
+func (alwaysDenyUi) ApproveListing(request *core.ListRequest) (core.ListResponse, error) {
+	return core.ListResponse{Accounts: nil}, nil
+}
+
+func (alwaysDenyUi) ApproveNewAccount(request *core.NewAccountRequest) (core.NewAccountResponse, error) {
+	return core.NewAccountResponse{Approved: false, Password: ""}, nil
+}
+
+func (alwaysDenyUi) ShowError(message string) {
+	panic("implement me")
+}
+
+func (alwaysDenyUi) ShowInfo(message string) {
+	panic("implement me")
+}
+
+func (alwaysDenyUi) OnApprovedTx(tx ethapi.SignTransactionResult) {
+	panic("implement me")
+}
+
+func initRuleEngine(js string) (*rulesetUi, error) {
+	r, err := NewRuleEvaluator(&alwaysDenyUi{}, storage.NewEphemeralStorage(), storage.NewEphemeralStorage())
+	if err != nil {
+		return nil, fmt.Errorf("failed to create js engine: %v", err)
+	}
+	if err = r.Init(js); err != nil {
+		return nil, fmt.Errorf("failed to load bootstrap js: %v", err)
+	}
+	return r, nil
+}
+
+func TestListRequest(t *testing.T) {
+	accs := make([]core.Account, 5)
+
+	for i := range accs {
+		addr := fmt.Sprintf("000000000000000000000000000000000000000%x", i)
+		acc := core.Account{
+			Address: common.BytesToAddress(common.Hex2Bytes(addr)),
+			URL:     accounts.URL{Scheme: "test", Path: fmt.Sprintf("acc-%d", i)},
+		}
+		accs[i] = acc
+	}
+
+	js := `function ApproveListing(){ return "Approve" }`
+
+	r, err := initRuleEngine(js)
+	if err != nil {
+		t.Errorf("Couldn't create evaluator %v", err)
+		return
+	}
+	resp, err := r.ApproveListing(&core.ListRequest{
+		Accounts: accs,
+		Meta:     core.Metadata{Remote: "remoteip", Local: "localip", Scheme: "inproc"},
+	})
+	if len(resp.Accounts) != len(accs) {
+		t.Errorf("Expected check to resolve to 'Approve'")
+	}
+}
+
+func TestSignTxRequest(t *testing.T) {
+
+	js := `
+	function ApproveTx(r){
+		console.log("transaction.from", r.transaction.from);
+		console.log("transaction.to", r.transaction.to);
+		console.log("transaction.value", r.transaction.value);
+		console.log("transaction.nonce", r.transaction.nonce);
+		if(r.transaction.from.toLowerCase()=="0x0000000000000000000000000000000000001337"){ return "Approve"}
+		if(r.transaction.from.toLowerCase()=="0x000000000000000000000000000000000000dead"){ return "Reject"}
+	}`
+
+	r, err := initRuleEngine(js)
+	if err != nil {
+		t.Errorf("Couldn't create evaluator %v", err)
+		return
+	}
+	to, err := mixAddr("000000000000000000000000000000000000dead")
+	if err != nil {
+		t.Error(err)
+		return
+	}
+	from, err := mixAddr("0000000000000000000000000000000000001337")
+
+	if err != nil {
+		t.Error(err)
+		return
+	}
+	fmt.Printf("to %v", to.Address().String())
+	resp, err := r.ApproveTx(&core.SignTxRequest{
+		Transaction: core.SendTxArgs{
+			From: *from,
+			To:   to},
+		Callinfo: nil,
+		Meta:     core.Metadata{Remote: "remoteip", Local: "localip", Scheme: "inproc"},
+	})
+	if err != nil {
+		t.Errorf("Unexpected error %v", err)
+	}
+	if !resp.Approved {
+		t.Errorf("Expected check to resolve to 'Approve'")
+	}
+}
+
+type dummyUi struct {
+	calls []string
+}
+
+func (d *dummyUi) ApproveTx(request *core.SignTxRequest) (core.SignTxResponse, error) {
+	d.calls = append(d.calls, "ApproveTx")
+	return core.SignTxResponse{}, core.ErrRequestDenied
+}
+
+func (d *dummyUi) ApproveSignData(request *core.SignDataRequest) (core.SignDataResponse, error) {
+	d.calls = append(d.calls, "ApproveSignData")
+	return core.SignDataResponse{}, core.ErrRequestDenied
+}
+
+func (d *dummyUi) ApproveExport(request *core.ExportRequest) (core.ExportResponse, error) {
+	d.calls = append(d.calls, "ApproveExport")
+	return core.ExportResponse{}, core.ErrRequestDenied
+}
+
+func (d *dummyUi) ApproveImport(request *core.ImportRequest) (core.ImportResponse, error) {
+	d.calls = append(d.calls, "ApproveImport")
+	return core.ImportResponse{}, core.ErrRequestDenied
+}
+
+func (d *dummyUi) ApproveListing(request *core.ListRequest) (core.ListResponse, error) {
+	d.calls = append(d.calls, "ApproveListing")
+	return core.ListResponse{}, core.ErrRequestDenied
+}
+
+func (d *dummyUi) ApproveNewAccount(request *core.NewAccountRequest) (core.NewAccountResponse, error) {
+	d.calls = append(d.calls, "ApproveNewAccount")
+	return core.NewAccountResponse{}, core.ErrRequestDenied
+}
+
+func (d *dummyUi) ShowError(message string) {
+	d.calls = append(d.calls, "ShowError")
+}
+
+func (d *dummyUi) ShowInfo(message string) {
+	d.calls = append(d.calls, "ShowInfo")
+}
+
+func (d *dummyUi) OnApprovedTx(tx ethapi.SignTransactionResult) {
+	d.calls = append(d.calls, "OnApprovedTx")
+}
+func (d *dummyUi) OnSignerStartup(info core.StartupInfo) {
+}
+
+//TestForwarding tests that the rule-engine correctly dispatches requests to the next caller
+func TestForwarding(t *testing.T) {
+
+	js := ""
+	ui := &dummyUi{make([]string, 0)}
+	jsBackend := storage.NewEphemeralStorage()
+	credBackend := storage.NewEphemeralStorage()
+	r, err := NewRuleEvaluator(ui, jsBackend, credBackend)
+	if err != nil {
+		t.Fatalf("Failed to create js engine: %v", err)
+	}
+	if err = r.Init(js); err != nil {
+		t.Fatalf("Failed to load bootstrap js: %v", err)
+	}
+	r.ApproveSignData(nil)
+	r.ApproveTx(nil)
+	r.ApproveImport(nil)
+	r.ApproveNewAccount(nil)
+	r.ApproveListing(nil)
+	r.ApproveExport(nil)
+	r.ShowError("test")
+	r.ShowInfo("test")
+
+	//This one is not forwarded
+	r.OnApprovedTx(ethapi.SignTransactionResult{})
+
+	expCalls := 8
+	if len(ui.calls) != expCalls {
+
+		t.Errorf("Expected %d forwarded calls, got %d: %s", expCalls, len(ui.calls), strings.Join(ui.calls, ","))
+
+	}
+
+}
+
+func TestMissingFunc(t *testing.T) {
+	r, err := initRuleEngine(JS)
+	if err != nil {
+		t.Errorf("Couldn't create evaluator %v", err)
+		return
+	}
+
+	_, err = r.execute("MissingMethod", "test")
+
+	if err == nil {
+		t.Error("Expected error")
+	}
+
+	approved, err := r.checkApproval("MissingMethod", nil, nil)
+	if err == nil {
+		t.Errorf("Expected missing method to yield error'")
+	}
+	if approved {
+		t.Errorf("Expected missing method to cause non-approval")
+	}
+	fmt.Printf("Err %v", err)
+
+}
+func TestStorage(t *testing.T) {
+
+	js := `
+	function testStorage(){
+		storage.Put("mykey", "myvalue")
+		a = storage.Get("mykey")
+		
+		storage.Put("mykey", ["a", "list"])  	// Should result in "a,list"
+		a += storage.Get("mykey")
+
+		
+		storage.Put("mykey", {"an": "object"}) 	// Should result in "[object Object]"
+		a += storage.Get("mykey")
+
+		
+		storage.Put("mykey", JSON.stringify({"an": "object"})) // Should result in '{"an":"object"}'
+		a += storage.Get("mykey")
+
+		a += storage.Get("missingkey")		//Missing keys should result in empty string
+		storage.Put("","missing key==noop") // Can't store with 0-length key
+		a += storage.Get("")				// Should result in ''
+		
+		var b = new BigNumber(2)
+		var c = new BigNumber(16)//"0xf0",16)
+		var d = b.plus(c)
+		console.log(d)
+		return a
+	}
+`
+	r, err := initRuleEngine(js)
+	if err != nil {
+		t.Errorf("Couldn't create evaluator %v", err)
+		return
+	}
+
+	v, err := r.execute("testStorage", nil)
+
+	if err != nil {
+		t.Errorf("Unexpected error %v", err)
+	}
+
+	retval, err := v.ToString()
+
+	if err != nil {
+		t.Errorf("Unexpected error %v", err)
+	}
+	exp := `myvaluea,list[object Object]{"an":"object"}`
+	if retval != exp {
+		t.Errorf("Unexpected data, expected '%v', got '%v'", exp, retval)
+	}
+	fmt.Printf("Err %v", err)
+
+}
+
+const ExampleTxWindow = `
+	function big(str){
+		if(str.slice(0,2) == "0x"){ return new BigNumber(str.slice(2),16)}
+		return new BigNumber(str)
+	}
+	
+	// Time window: 1 week
+	var window = 1000* 3600*24*7;
+
+	// Limit : 1 ether
+	var limit = new BigNumber("1e18");
+
+	function isLimitOk(transaction){
+		var value = big(transaction.value)
+		// Start of our window function		
+		var windowstart = new Date().getTime() - window;
+
+		var txs = [];
+		var stored = storage.Get('txs');
+
+		if(stored != ""){
+			txs = JSON.parse(stored)
+		}
+		// First, remove all that have passed out of the time-window
+		var newtxs = txs.filter(function(tx){return tx.tstamp > windowstart});
+		console.log(txs, newtxs.length);
+	
+		// Secondly, aggregate the current sum
+		sum = new BigNumber(0)
+
+		sum = newtxs.reduce(function(agg, tx){ return big(tx.value).plus(agg)}, sum);
+		console.log("ApproveTx > Sum so far", sum);
+		console.log("ApproveTx > Requested", value.toNumber());
+		
+		// Would we exceed weekly limit ?
+		return sum.plus(value).lt(limit)
+		
+	}
+	function ApproveTx(r){
+		console.log(r)
+		console.log(typeof(r))
+		if (isLimitOk(r.transaction)){
+			return "Approve"
+		}
+		return "Nope"
+	}
+
+	/**
+	* OnApprovedTx(str) is called when a transaction has been approved and signed. The parameter
+ 	* 'response_str' contains the return value that will be sent to the external caller. 
+	* The return value from this method is ignore - the reason for having this callback is to allow the 
+	* ruleset to keep track of approved transactions. 
+	*
+	* When implementing rate-limited rules, this callback should be used. 
+	* If a rule responds with neither 'Approve' nor 'Reject' - the tx goes to manual processing. If the user
+	* then accepts the transaction, this method will be called.
+	* 
+	* TLDR; Use this method to keep track of signed transactions, instead of using the data in ApproveTx.
+	*/
+ 	function OnApprovedTx(resp){
+		var value = big(resp.tx.value)
+		var txs = []
+		// Load stored transactions
+		var stored = storage.Get('txs');
+		if(stored != ""){
+			txs = JSON.parse(stored)
+		}
+		// Add this to the storage
+		txs.push({tstamp: new Date().getTime(), value: value});
+		storage.Put("txs", JSON.stringify(txs));
+	}
+
+`
+
+func dummyTx(value hexutil.Big) *core.SignTxRequest {
+
+	to, _ := mixAddr("000000000000000000000000000000000000dead")
+	from, _ := mixAddr("000000000000000000000000000000000000dead")
+	n := hexutil.Uint64(3)
+	gas := hexutil.Uint64(21000)
+	gasPrice := hexutil.Big(*big.NewInt(2000000))
+
+	return &core.SignTxRequest{
+		Transaction: core.SendTxArgs{
+			From:     *from,
+			To:       to,
+			Value:    value,
+			Nonce:    n,
+			GasPrice: gasPrice,
+			Gas:      gas,
+		},
+		Callinfo: []core.ValidationInfo{
+			{Typ: "Warning", Message: "All your base are bellong to us"},
+		},
+		Meta: core.Metadata{Remote: "remoteip", Local: "localip", Scheme: "inproc"},
+	}
+}
+func dummyTxWithV(value uint64) *core.SignTxRequest {
+
+	v := big.NewInt(0).SetUint64(value)
+	h := hexutil.Big(*v)
+	return dummyTx(h)
+}
+func dummySigned(value *big.Int) *types.Transaction {
+	to := common.HexToAddress("000000000000000000000000000000000000dead")
+	gas := uint64(21000)
+	gasPrice := big.NewInt(2000000)
+	data := make([]byte, 0)
+	return types.NewTransaction(3, to, value, gas, gasPrice, data)
+
+}
+func TestLimitWindow(t *testing.T) {
+
+	r, err := initRuleEngine(ExampleTxWindow)
+	if err != nil {
+		t.Errorf("Couldn't create evaluator %v", err)
+		return
+	}
+
+	// 0.3 ether: 429D069189E0000 wei
+	v := big.NewInt(0).SetBytes(common.Hex2Bytes("0429D069189E0000"))
+	h := hexutil.Big(*v)
+	// The first three should succeed
+	for i := 0; i < 3; i++ {
+		unsigned := dummyTx(h)
+		resp, err := r.ApproveTx(unsigned)
+		if err != nil {
+			t.Errorf("Unexpected error %v", err)
+		}
+		if !resp.Approved {
+			t.Errorf("Expected check to resolve to 'Approve'")
+		}
+		// Create a dummy signed transaction
+
+		response := ethapi.SignTransactionResult{
+			Tx:  dummySigned(v),
+			Raw: common.Hex2Bytes("deadbeef"),
+		}
+		r.OnApprovedTx(response)
+	}
+	// Fourth should fail
+	resp, err := r.ApproveTx(dummyTx(h))
+	if resp.Approved {
+		t.Errorf("Expected check to resolve to 'Reject'")
+	}
+
+}
+
+// dontCallMe is used as a next-handler that does not want to be called - it invokes test failure
+type dontCallMe struct {
+	t *testing.T
+}
+
+func (d *dontCallMe) OnSignerStartup(info core.StartupInfo) {
+}
+
+func (d *dontCallMe) ApproveTx(request *core.SignTxRequest) (core.SignTxResponse, error) {
+	d.t.Fatalf("Did not expect next-handler to be called")
+	return core.SignTxResponse{}, core.ErrRequestDenied
+}
+
+func (d *dontCallMe) ApproveSignData(request *core.SignDataRequest) (core.SignDataResponse, error) {
+	d.t.Fatalf("Did not expect next-handler to be called")
+	return core.SignDataResponse{}, core.ErrRequestDenied
+}
+
+func (d *dontCallMe) ApproveExport(request *core.ExportRequest) (core.ExportResponse, error) {
+	d.t.Fatalf("Did not expect next-handler to be called")
+	return core.ExportResponse{}, core.ErrRequestDenied
+}
+
+func (d *dontCallMe) ApproveImport(request *core.ImportRequest) (core.ImportResponse, error) {
+	d.t.Fatalf("Did not expect next-handler to be called")
+	return core.ImportResponse{}, core.ErrRequestDenied
+}
+
+func (d *dontCallMe) ApproveListing(request *core.ListRequest) (core.ListResponse, error) {
+	d.t.Fatalf("Did not expect next-handler to be called")
+	return core.ListResponse{}, core.ErrRequestDenied
+}
+
+func (d *dontCallMe) ApproveNewAccount(request *core.NewAccountRequest) (core.NewAccountResponse, error) {
+	d.t.Fatalf("Did not expect next-handler to be called")
+	return core.NewAccountResponse{}, core.ErrRequestDenied
+}
+
+func (d *dontCallMe) ShowError(message string) {
+	d.t.Fatalf("Did not expect next-handler to be called")
+}
+
+func (d *dontCallMe) ShowInfo(message string) {
+	d.t.Fatalf("Did not expect next-handler to be called")
+}
+
+func (d *dontCallMe) OnApprovedTx(tx ethapi.SignTransactionResult) {
+	d.t.Fatalf("Did not expect next-handler to be called")
+}
+
+//TestContextIsCleared tests that the rule-engine does not retain variables over several requests.
+// if it does, that would be bad since developers may rely on that to store data,
+// instead of using the disk-based data storage
+func TestContextIsCleared(t *testing.T) {
+
+	js := `
+	function ApproveTx(){
+		if (typeof foobar == 'undefined') {
+			foobar = "Approve"
+ 		}
+		console.log(foobar)
+		if (foobar == "Approve"){
+			foobar = "Reject"
+		}else{
+			foobar = "Approve"
+		}
+		return foobar
+	}
+	`
+	ui := &dontCallMe{t}
+	r, err := NewRuleEvaluator(ui, storage.NewEphemeralStorage(), storage.NewEphemeralStorage())
+	if err != nil {
+		t.Fatalf("Failed to create js engine: %v", err)
+	}
+	if err = r.Init(js); err != nil {
+		t.Fatalf("Failed to load bootstrap js: %v", err)
+	}
+	tx := dummyTxWithV(0)
+	r1, err := r.ApproveTx(tx)
+	r2, err := r.ApproveTx(tx)
+	if r1.Approved != r2.Approved {
+		t.Errorf("Expected execution context to be cleared between executions")
+	}
+}
+
+func TestSignData(t *testing.T) {
+
+	js := `function ApproveListing(){
+    return "Approve"
+}
+function ApproveSignData(r){
+    if( r.address.toLowerCase() == "0x694267f14675d7e1b9494fd8d72fefe1755710fa")
+    {
+        if(r.message.indexOf("bazonk") >= 0){
+            return "Approve"
+        }
+        return "Reject"
+    }
+    // Otherwise goes to manual processing
+}`
+	r, err := initRuleEngine(js)
+	if err != nil {
+		t.Errorf("Couldn't create evaluator %v", err)
+		return
+	}
+	message := []byte("baz bazonk foo")
+	hash, msg := core.SignHash(message)
+	raw := hexutil.Bytes(message)
+	addr, _ := mixAddr("0x694267f14675d7e1b9494fd8d72fefe1755710fa")
+
+	fmt.Printf("address %v %v\n", addr.String(), addr.Original())
+	resp, err := r.ApproveSignData(&core.SignDataRequest{
+		Address: *addr,
+		Message: msg,
+		Hash:    hash,
+		Meta:    core.Metadata{Remote: "remoteip", Local: "localip", Scheme: "inproc"},
+		Rawdata: raw,
+	})
+	if err != nil {
+		t.Fatalf("Unexpected error %v", err)
+	}
+	if !resp.Approved {
+		t.Fatalf("Expected approved")
+	}
+}