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

cmd/signer/README.md

@@ -386,6 +386,8 @@ A UI should conform to the following rules.
 * A UI MUST NOT load any external resources that were not embedded/part of the UI package.
   * For example, not load icons, stylesheets from the internet
   * Not load files from the filesystem, unless they reside in the same local directory (e.g. config files)
+* A Graphical UI MUST show the blocky-identicon for ethereum addresses.
+* A UI MUST warn display approproate warning if the destination-account is formatted with invalid checksum.
 * A UI MUST NOT open any ports or services
   * The signer opens the public port
 * A UI SHOULD verify the permissions on the signer binary, and refuse to execute or warn if permissions allow non-user write.
@@ -400,15 +402,8 @@ along with the UI.
 
 Some snags and todos
 
-* Currently, the API does not make it possible for the signer to forward data about the
-checksum, since the addresses are common.Address, and not String. This should be changed upstream,
-so that they are some more complex form with both common.Address and the original string (?)
-
-
 * The audit-log perhaps leave some things to be desired. I have not found a perfect way to save an audit log of events.
 
-* Some more fields should be added to calldata, e.g http-header `Origin`.
-
 * The signer should take a startup param "--no-change", for UI:s that do not contain the capability
    to perform changes to things, only approve/deny. Such a UI should be able to start the signer in
    a more secure mode by telling it that it only wants approve/deny capabilities.
@@ -434,6 +429,11 @@ put together is a bit of a hack into the http server. This could probably be gre
 
 * Geth relay
     - Geth should be started in `geth --external_signer localhost:8550`.
+* Geth checksum
+  - Currently, the Geth API:s use `common.Address` in the arguments to transaction submission (e.g `to` field). This
+  type is 20 `bytes`, and is incapable of carrying checksum information. The signer uses `common.MixedcaseAddress`, which
+  retains the original input.
+  - The Geth api should switch to use the same type, and relay `to`-account verbatim to the external api.
 
 * Wallets / accounts. Add API methods for wallets.
 

cmd/signer/abihelper.go

@@ -20,11 +20,12 @@ import (
 	"bytes"
 	"encoding/json"
 	"fmt"
-	"github.com/ethereum/go-ethereum/accounts/abi"
-	"github.com/ethereum/go-ethereum/common"
 	"io/ioutil"
 	"strings"
 
+	"github.com/ethereum/go-ethereum/accounts/abi"
+	"github.com/ethereum/go-ethereum/common"
+
 	"regexp"
 )
 

cmd/signer/abihelper_test.go

@@ -18,10 +18,11 @@ package main
 
 import (
 	"fmt"
-	"github.com/ethereum/go-ethereum/accounts/abi"
-	"github.com/ethereum/go-ethereum/common"
 	"strings"
 	"testing"
+
+	"github.com/ethereum/go-ethereum/accounts/abi"
+	"github.com/ethereum/go-ethereum/common"
 )
 
 func TestCalldataDecoding(t *testing.T) {

cmd/signer/api.go

@@ -25,6 +25,7 @@ import (
 	"math/big"
 
 	"bytes"
+
 	"github.com/ethereum/go-ethereum/accounts"
 	"github.com/ethereum/go-ethereum/accounts/keystore"
 	"github.com/ethereum/go-ethereum/accounts/usbwallet"
@@ -55,7 +56,7 @@ type (
 	// SignTxRequest contains info about a Transaction to sign
 	SignTxRequest struct {
 		Transaction TransactionArg          `json:"transaction"`
-		From        common.Address `json:"fromaccount"`
+		From        common.MixedcaseAddress `json:"fromaccount"`
 		Callinfo    string                  `json:"call_info"`
 		Meta        Metadata                `json:"meta"`
 	}
@@ -63,7 +64,7 @@ type (
 	SignTxResponse struct {
 		//The UI may make changes to the TX
 		Transaction TransactionArg          `json:"transaction"`
-		From        common.Address `json:"fromaccount"`
+		From        common.MixedcaseAddress `json:"fromaccount"`
 		Approved    bool                    `json:"approved"`
 		Password    string                  `json:"password"`
 	}
@@ -86,7 +87,7 @@ type (
 		NewPassword string `json:"new_password"`
 	}
 	SignDataRequest struct {
-		Address common.Address `json:"address"`
+		Address common.MixedcaseAddress `json:"address"`
 		Rawdata hexutil.Bytes           `json:"raw_data"`
 		Message string                  `json:"message"`
 		Hash    hexutil.Bytes           `json:"hash"`
@@ -111,7 +112,7 @@ type (
 		Accounts []Account `json:"accounts"`
 	}
 	Message struct {
-		Message string `json:"message"`
+		Text string `json:"text"`
 	}
 )
 
@@ -246,7 +247,7 @@ func toTransaction(args *TransactionArg) *types.Transaction {
 	if args.To == nil {
 		return types.NewContractCreation(uint64(*args.Nonce), (*big.Int)(args.Value), (*big.Int)(args.Gas), (*big.Int)(args.GasPrice), args.Data)
 	} else {
-		return types.NewTransaction(uint64(*args.Nonce), *args.To, (*big.Int)(args.Value), (*big.Int)(args.Gas), (*big.Int)(args.GasPrice), args.Data)
+		return types.NewTransaction(uint64(*args.Nonce), args.To.Address(), (*big.Int)(args.Value), (*big.Int)(args.Gas), (*big.Int)(args.GasPrice), args.Data)
 	}
 }
 
@@ -260,11 +261,9 @@ func logDiff(original *SignTxRequest, new *SignTxResponse) bool {
 		log.Info("Sender-account changed by UI", "was", f0, "is", f1)
 	}
 	if t0, t1 := original.Transaction.To, new.Transaction.To; t0 != t1 {
-		if t0 == nil || t1 == nil || !bytes.Equal(t0.Bytes(), t1.Bytes()) {
 		log.Info("Recipient-account changed by UI", "was", t0, "is", t1)
 		modified = true
 	}
-	}
 	if g0, g1 := (*big.Int)(original.Transaction.Gas), (*big.Int)(new.Transaction.Gas); g0 != g1 {
 		if g0 == nil || g1 == nil || g0.Cmp(g1) != 0 {
 			modified = true
@@ -299,7 +298,7 @@ func logDiff(original *SignTxRequest, new *SignTxResponse) bool {
 
 // SignTransaction signs the given Transaction and returns it in an RLP encoded form
 // that can be posted to `eth_sendRawTransaction`.
-func (api *SignerAPI) SignTransaction(ctx context.Context, from common.Address, args TransactionArg, methodSelector *string) (hexutil.Bytes, error) {
+func (api *SignerAPI) SignTransaction(ctx context.Context, from common.MixedcaseAddress, args TransactionArg, methodSelector *string) (hexutil.Bytes, error) {
 
 	var (
 		err    error
@@ -350,7 +349,7 @@ func (api *SignerAPI) SignTransaction(ctx context.Context, from common.Address,
 		acc    accounts.Account
 		wallet accounts.Wallet
 	)
-	acc = accounts.Account{Address: result.From}
+	acc = accounts.Account{Address: result.From.Address()}
 	wallet, err = api.am.Find(acc)
 	if err != nil {
 		return nil, err
@@ -376,7 +375,7 @@ func (api *SignerAPI) SignTransaction(ctx context.Context, from common.Address,
 // The key used to calculate the signature is decrypted with the given password.
 //
 // https://github.com/ethereum/go-ethereum/wiki/Management-APIs#personal_sign
-func (api *SignerAPI) Sign(ctx context.Context, addr common.Address, data hexutil.Bytes) (hexutil.Bytes, error) {
+func (api *SignerAPI) Sign(ctx context.Context, addr common.MixedcaseAddress, data hexutil.Bytes) (hexutil.Bytes, error) {
 
 	sighash, msg := signHash(data)
 
@@ -393,7 +392,7 @@ func (api *SignerAPI) Sign(ctx context.Context, addr common.Address, data hexuti
 	}
 
 	// Look up the wallet containing the requested signer
-	account := accounts.Account{Address: addr}
+	account := accounts.Account{Address: addr.Address()}
 	wallet, err := api.am.Find(account)
 	if err != nil {
 		return nil, err

cmd/signer/api_test.go

@@ -4,18 +4,19 @@ import (
 	"bytes"
 	"context"
 	"fmt"
-	"github.com/ethereum/go-ethereum/accounts/keystore"
-	"github.com/ethereum/go-ethereum/cmd/utils"
-	"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/rlp"
 	"io/ioutil"
 	"math/big"
 	"os"
 	"path/filepath"
 	"testing"
 	"time"
+
+	"github.com/ethereum/go-ethereum/accounts/keystore"
+	"github.com/ethereum/go-ethereum/cmd/utils"
+	"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/rlp"
 )
 
 //Used for testing
@@ -198,7 +199,7 @@ func TestSignData(t *testing.T) {
 	if err != nil {
 		t.Fatal(err)
 	}
-	a := list[0].Address
+	a := common.NewMixedcaseAddress(list[0].Address)
 
 	control <- "Y"
 	control <- "wrongpassword"
@@ -231,7 +232,7 @@ func TestSignData(t *testing.T) {
 	}
 }
 func mkTestTx() TransactionArg {
-	to := common.HexToAddress("0x1337")
+	to := common.NewMixedcaseAddress(common.HexToAddress("0x1337"))
 	gas := (*hexutil.Big)(big.NewInt(21000))
 	gasPrice := (*hexutil.Big)(big.NewInt(2000000000))
 	value := (*hexutil.Big)(big.NewInt(1e18))
@@ -262,7 +263,7 @@ func TestSignTx(t *testing.T) {
 	if err != nil {
 		t.Fatal(err)
 	}
-	a := list[0].Address
+	a := common.NewMixedcaseAddress(list[0].Address)
 
 	methodSig := "test(uint)"
 	tx := mkTestTx()

cmd/signer/auditlog.go

@@ -3,9 +3,10 @@ package main
 import (
 	"bufio"
 	"fmt"
-	"github.com/ethereum/go-ethereum/rpc"
 	"io"
 	"time"
+
+	"github.com/ethereum/go-ethereum/rpc"
 )
 
 type AuditLogger struct {

cmd/signer/cliui.go

@@ -21,10 +21,11 @@ import (
 	"os"
 	"strings"
 
+	"sync"
+
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/log"
 	"golang.org/x/crypto/ssh/terminal"
-	"sync"
 )
 
 type CommandlineUI struct {
@@ -98,13 +99,16 @@ func (ui *CommandlineUI) ApproveTx(request *SignTxRequest) (SignTxResponse, erro
 	ui.mu.Lock()
 	defer ui.mu.Unlock()
 	weival := request.Transaction.Value.ToInt()
-	toval := ""
-	if request.Transaction.To != nil {
-		toval = request.Transaction.To.Hex()
-	}
 	fmt.Printf("--------- Transaction request-------------\n")
-	fmt.Printf("to:    %v\n", toval)
+	if to := request.Transaction.To; to != nil {
-	fmt.Printf("from:  %v\n", request.From.Hex())
+		fmt.Printf("to:    %v\n", to.Original())
+		if !to.ValidChecksum() {
+			fmt.Printf("\nWARNING: Invalid checksum on to-address!\n\n")
+		}
+	} else {
+		fmt.Printf("to:    <contact creation>\n")
+	}
+	fmt.Printf("from:  %v\n", request.From.String())
 	fmt.Printf("value: %v wei\n", weival)
 	if len(request.Transaction.Data) > 0 {
 		fmt.Printf("data:  %v\n", common.Bytes2Hex(request.Transaction.Data))

cmd/signer/main.go

@@ -26,6 +26,7 @@ import (
 
 	"context"
 	"encoding/json"
+
 	"github.com/ethereum/go-ethereum/cmd/utils"
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/log"
@@ -33,7 +34,6 @@ import (
 	"github.com/ethereum/go-ethereum/params"
 	"github.com/ethereum/go-ethereum/rpc"
 	"gopkg.in/urfave/cli.v1"
-	"io"
 )
 
 func main() {
@@ -97,18 +97,19 @@ func main() {
 
 		var (
 			ui SignerUI
-			logOutput io.Writer
 		)
-
+		// Set up the logger to print everything
+		logOutput := os.Stdout
 		if c.Bool("stdio-ui") {
 			logOutput = os.Stderr
+		}
+		log.Root().SetHandler(log.LvlFilterHandler(log.Lvl(c.Int("loglevel")), log.StreamHandler(logOutput, log.TerminalFormat(true))))
+
+		if c.Bool("stdio-ui") {
 			ui = NewStdIOUI()
 		} else {
 			ui = NewCommandlineUI()
-			logOutput = os.Stdout
 		}
-		// Set up the logger to print everything
-		log.Root().SetHandler(log.LvlFilterHandler(log.Lvl(c.Int("loglevel")), log.StreamHandler(logOutput, log.TerminalFormat(true))))
 		if c.Bool("stdio-ui") {
 			log.Info("Using stdin/stdout as UI-channel")
 		}
@@ -190,9 +191,9 @@ func testExternalUI(api *SignerAPI) {
 	}
 	var err error
 
-	_, err = api.SignTransaction(ctx, common.Address{}, TransactionArg{}, nil)
+	_, err = api.SignTransaction(ctx, common.MixedcaseAddress{}, TransactionArg{}, nil)
 	checkErr("SignTransaction", err)
-	_, err = api.Sign(ctx, common.Address{}, common.Hex2Bytes("01020304"))
+	_, err = api.Sign(ctx, common.MixedcaseAddress{}, common.Hex2Bytes("01020304"))
 	checkErr("Sign", err)
 	_, err = api.List(ctx)
 	checkErr("List", err)

cmd/signer/pythonsigner.py

@@ -1,7 +1,7 @@
 import os,sys, subprocess
 from tinyrpc.transports import ServerTransport
 from tinyrpc.protocols.jsonrpc import JSONRPCProtocol
-from tinyrpc.dispatch import RPCDispatcher
+from tinyrpc.dispatch import public,RPCDispatcher
 from tinyrpc.server import RPCServer
 
 """ This is a POC example of how to write a custom UI for the signer. The UI starts the 
@@ -34,22 +34,25 @@ class PipeTransport(ServerTransport):
 
     def receive_message(self):
         data = self.input.readline()
-        #print(">> {}".format( data))
+        print(">> {}".format( data))
         return None, urlparse.unquote(data)
 
     def send_reply(self, context, reply):
-        #print("<< {}".format( reply))
+        print("<< {}".format( reply))
         self.output.write(reply)
         self.output.write("\n")
 
-dispatcher = RPCDispatcher()
+class StdIOHandler():
 
-@dispatcher.public
+    def __init__(self):
-def ApproveTx(transaction = None, fromaccount = None, call_info = None, meta = None):
+        pass
+
+    @public
+    def ApproveTx(self,transaction = None, fromaccount = None, call_info = None, meta = None):
         """
         Example request:
         
-    {"jsonrpc":"2.0","method":"ApproveTx","params":{"transaction":{"to":null,"gas":null,"gasPrice":null,"value":null,"data":"0x","nonce":null},"fromaccount":"0x0000000000000000000000000000000000000000","call_info":null,"meta":{"remote":"signer binary","local":"main","scheme":"in-proc"}},"id":2}
+        {"jsonrpc":"2.0","method":"ApproveTx","params":{"transaction":{"to":null,"gas":null,"gasPrice":null,"value":null,"data":"0x","nonce":null},"from":"0x0000000000000000000000000000000000000000","call_info":null,"meta":{"remote":"signer binary","local":"main","scheme":"in-proc"}},"id":2}
 
         :param transaction: transaction info
         :param call_info: info abou the call, e.g. if ABI info could not be
@@ -59,12 +62,12 @@ def ApproveTx(transaction = None, fromaccount = None, call_info = None, meta = N
         return {
             "approved" : False,
             "transaction" : None,
-#        "fromaccount" : fromaccount,
+            #"fromaccount" : fromaccount,
             "password" : None,
         }
 
-@dispatcher.public
+    @public
-def ApproveSignData(address=None, raw_data = None, message = None, hash = None, meta = None):
+    def ApproveSignData(self,address=None, raw_data = None, message = None, hash = None, meta = None):
         """ Example request
 
         {"jsonrpc":"2.0","method":"ApproveSignData","params":{"address":"0x0000000000000000000000000000000000000000","raw_data":"0x01020304","message":"\u0019Ethereum Signed Message:\n4\u0001\u0002\u0003\u0004","hash":"0x7e3a4e7a9d1744bc5c675c25e1234ca8ed9162bd17f78b9085e48047c15ac310","meta":{"remote":"signer binary","local":"main","scheme":"in-proc"}},"id":3}
@@ -74,8 +77,8 @@ def ApproveSignData(address=None, raw_data = None, message = None, hash = None,
         return {"approved": False,
                 "password" : None}
 
-@dispatcher.public
+    @public
-def ApproveExport(address = None, meta = None):
+    def ApproveExport(self,address = None, meta = None):
         """ Example request
 
         {"jsonrpc":"2.0","method":"ApproveExport","params":{"address":"0x0000000000000000000000000000000000000000","meta":{"remote":"signer binary","local":"main","scheme":"in-proc"}},"id":5}
@@ -83,8 +86,8 @@ def ApproveExport(address = None, meta = None):
         """
         return {"approved" : False}
 
-@dispatcher.public
+    @public
-def ApproveImport(meta = None):
+    def ApproveImport(self,meta = None):
         """ Example request
 
         {"jsonrpc":"2.0","method":"ApproveImport","params":{"Meta":{}},"id":4}
@@ -92,16 +95,16 @@ def ApproveImport(meta = None):
         """
         return {"approved" : False, "old_password": "", "new_password": ""}
 
-@dispatcher.public
+    @public
-def ApproveListing(accounts=None, meta = None):
+    def ApproveListing(self,accounts=None, meta = None):
         """ Example request
 
         {"jsonrpc":"2.0","method":"ApproveListing","params":{"accounts":[{"type":"Account","url":"keystore:///home/user/ethereum/keystore/file","address":"0x010101010101010010101010101abcdef0001337"}],"Meta":{}},"id":2}
         """
         return {'accounts': []}
 
-@dispatcher.public
+    @public
-def ApproveNewAccount(meta = None):
+    def ApproveNewAccount(self,meta = None):
         """
         Example request
 
@@ -111,43 +114,46 @@ def ApproveNewAccount(meta = None):
         """
         return {"approved": False, "password": ""}
 
-@dispatcher.public
+    @public
-def ShowError(message = ""):
+    def ShowError(self,message = {}):
         """
         Example request:
 
         {"jsonrpc":"2.0","method":"ShowInfo","params":{"message":"Testing 'ShowError'"},"id":1}
 
-    :param text: to show
+        :param message: to show
         :return: nothing
         """
-    sys.stderr.write("Error: {}\n".format( message))
+        if 'text' in message.keys():
+            sys.stderr.write("Error: {}\n".format( message['text']))
         return
 
-@dispatcher.public
+    @public
-def ShowInfo(message = ""):
+    def ShowInfo(self,message = {}):
         """
         Example request
         {"jsonrpc":"2.0","method":"ShowInfo","params":{"message":"Testing 'ShowInfo'"},"id":0}
 
-    :param text: to display
+        :param message: to display
         :return:nothing
         """
-    sys.stdout.write("Info: {}\n".format( message))
+        if 'text' in message.keys():
+            sys.stdout.write("Error: {}\n".format( message['text']))
         return
 
-
 def main(args):
 
     cmd = ["./signer", "--stdio-ui"]
     if len(args) > 0 and args[0] == "test":
         cmd.extend(["--stdio-ui-test"])
     print("cmd: {}".format(" ".join(cmd)))
+    dispatcher = RPCDispatcher()
+    dispatcher.register_instance(StdIOHandler(), '')
     # line buffered
     p = subprocess.Popen(cmd, bufsize=1, universal_newlines=True, stdin=subprocess.PIPE, stdout=subprocess.PIPE)
-    transport = PipeTransport(p.stdout, p.stdin)
+
     rpc_server = RPCServer(
-        transport,
+        PipeTransport(p.stdout, p.stdin),
         JSONRPCProtocol(),
         dispatcher
     )

cmd/signer/stdioui.go

@@ -20,11 +20,10 @@ package main
 import (
 	"github.com/ethereum/go-ethereum/log"
 
-	"github.com/ethereum/go-ethereum/rpc"
-	"io"
-	"os"
 	"sync"
 
+	"github.com/ethereum/go-ethereum/rpc"
+
 	"context"
 )
 
@@ -36,47 +35,33 @@ type StdIOUI struct {
 }
 
 func NewStdIOUI() *StdIOUI {
+	log.Info("NewStdIOUI")
 	//	in, out := bufio.NewReader(os.Stdin), os.Stdout
 	client, err := rpc.DialContext(context.Background(), "stdio://")
 	if err != nil {
 		log.Crit("Could not create stdio client", "err", err)
 	}
 	return &StdIOUI{client: *client}
-	//return &StdIOUI{client: jsonrpc2.NewClient(&rwc{in, out})}
-
 }
 
-func (ui StdIOUI) dispatch(serviceMethod string, args interface{}, reply interface{}) error {
+// dispatch sends a request over the stdio
-
+func (ui *StdIOUI) dispatch(serviceMethod string, args interface{}, reply interface{}) error {
-	//	ui.mu.Lock()
-	//	defer ui.mu.Unlock()
-	//This is not synchronized, which should not be necssary. Ideally, the UI should be able
-	// to get requests and send responses out-of-order -- thus the rpc has an ID.
-
-	//	in, out := bufio.NewReader(os.Stdin), os.Stdout
-	//	codec := jsonrpc.NewClientCodec(&rwc{in, out})
-
-	// c := rpc.NewClientWithCodec(codec)
-	//	return c.Call(serviceMethod, args, &reply)
-	log.Info("Writing to client")
 	err := ui.client.Call(&reply, serviceMethod, args)
-	log.Info("Writing to client done")
-	//	err := ui.client.Call(serviceMethod, args, &reply)
 	if err != nil {
 		log.Info("Error", "exc", err.Error())
 	}
 	return err
 }
 
-func (ui StdIOUI) ApproveTx(request *SignTxRequest) (SignTxResponse, error) {
+func (ui *StdIOUI) ApproveTx(request *SignTxRequest) (SignTxResponse, error) {
-	result := SignTxResponse{}
+	var result SignTxResponse
 	if err := ui.dispatch("ApproveTx", request, &result); err != nil {
 		return result, err
 	}
 	return result, nil
 }
 
-func (ui StdIOUI) ApproveSignData(request *SignDataRequest) (SignDataResponse, error) {
+func (ui *StdIOUI) ApproveSignData(request *SignDataRequest) (SignDataResponse, error) {
 	var result SignDataResponse
 	if err := ui.dispatch("ApproveSignData", request, &result); err != nil {
 		return result, err
@@ -84,7 +69,7 @@ func (ui StdIOUI) ApproveSignData(request *SignDataRequest) (SignDataResponse, e
 	return result, nil
 }
 
-func (ui StdIOUI) ApproveExport(request *ExportRequest) (ExportResponse, error) {
+func (ui *StdIOUI) ApproveExport(request *ExportRequest) (ExportResponse, error) {
 	var result ExportResponse
 	if err := ui.dispatch("ApproveExport", request, &result); err != nil {
 		return result, err
@@ -92,7 +77,7 @@ func (ui StdIOUI) ApproveExport(request *ExportRequest) (ExportResponse, error)
 	return result, nil
 }
 
-func (ui StdIOUI) ApproveImport(request *ImportRequest) (ImportResponse, error) {
+func (ui *StdIOUI) ApproveImport(request *ImportRequest) (ImportResponse, error) {
 	var result ImportResponse
 	if err := ui.dispatch("ApproveImport", request, &result); err != nil {
 		return result, err
@@ -100,7 +85,7 @@ func (ui StdIOUI) ApproveImport(request *ImportRequest) (ImportResponse, error)
 	return result, nil
 }
 
-func (ui StdIOUI) ApproveListing(request *ListRequest) (ListResponse, error) {
+func (ui *StdIOUI) ApproveListing(request *ListRequest) (ListResponse, error) {
 	var result ListResponse
 	if err := ui.dispatch("ApproveListing", request, &result); err != nil {
 		return result, err
@@ -108,7 +93,7 @@ func (ui StdIOUI) ApproveListing(request *ListRequest) (ListResponse, error) {
 	return result, nil
 }
 
-func (ui StdIOUI) ApproveNewAccount(request *NewAccountRequest) (NewAccountResponse, error) {
+func (ui *StdIOUI) ApproveNewAccount(request *NewAccountRequest) (NewAccountResponse, error) {
 	var result NewAccountResponse
 	if err := ui.dispatch("ApproveNewAccount", request, &result); err != nil {
 		return result, err
@@ -116,29 +101,16 @@ func (ui StdIOUI) ApproveNewAccount(request *NewAccountRequest) (NewAccountRespo
 	return result, nil
 }
 
-func (ui StdIOUI) ShowError(message string) {
+func (ui *StdIOUI) ShowError(message string) {
 	err := ui.dispatch("ShowError", &Message{message}, nil)
 	if err != nil {
 		log.Info("Error calling 'ShowError'", "exc", err.Error(), "msg", message)
 	}
 }
 
-func (ui StdIOUI) ShowInfo(message string) {
+func (ui *StdIOUI) ShowInfo(message string) {
 	err := ui.dispatch("ShowInfo", Message{message}, nil)
 	if err != nil {
 		log.Info("Error calling 'ShowInfo'", "exc", err.Error(), "msg", message)
 	}
 }
-
-type rwc struct {
-	io.Reader
-	io.Writer
-}
-
-func (r *rwc) Close() error {
-	if err := os.Stdin.Close(); err != nil {
-		return err
-	}
-	return os.Stdout.Close()
-	//return nil
-}

cmd/signer/types.go

@@ -18,10 +18,11 @@ package main
 
 import (
 	"encoding/json"
+	"strings"
+
 	"github.com/ethereum/go-ethereum/accounts"
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/common/hexutil"
-	"strings"
 )
 
 type Accounts []Account
@@ -50,7 +51,7 @@ func (a Account) String() string {
 
 // TransactionArg represents a Transaction for the signer.
 type TransactionArg struct {
-	To       *common.Address `json:"to"`
+	To       *common.MixedcaseAddress `json:"to"`
 	Gas      *hexutil.Big             `json:"gas"`
 	GasPrice *hexutil.Big             `json:"gasPrice"`
 	Value    *hexutil.Big             `json:"value"`

common/types.go

@@ -23,6 +23,7 @@ import (
 	"math/rand"
 	"reflect"
 
+	"encoding/json"
 	"github.com/ethereum/go-ethereum/common/hexutil"
 	"github.com/ethereum/go-ethereum/crypto/sha3"
 )
@@ -240,3 +241,56 @@ func (a *UnprefixedAddress) UnmarshalText(input []byte) error {
 func (a UnprefixedAddress) MarshalText() ([]byte, error) {
 	return []byte(hex.EncodeToString(a[:])), nil
 }
+
+// MixedcaseAddress retains the original string, which may or may not be
+// correctly checksummed
+//
+// TODO! Should we really keep both addr and original, or _only_ original, and
+// always calculate addr on the fly? That would reduce the possibilities for errors
+// if some caller modifies the original at some point. NB: If we do so, we should still
+// parse the addr in UnmarshalJSON to ensure that the format is correct, e.g. correct size and
+// hex-encoded and such
+type MixedcaseAddress struct {
+	addr     Address
+	original string
+}
+// NewMixedcaseAddress constructor (mainly for testing)
+func NewMixedcaseAddress(addr Address) MixedcaseAddress {
+	return MixedcaseAddress{addr: addr, original: addr.Hex()}
+}
+
+// UnmarshalJSON parses MixedcaseAddress
+func (ma *MixedcaseAddress) UnmarshalJSON(input []byte) error {
+	if err := hexutil.UnmarshalFixedJSON(addressT, input, ma.addr[:]); err != nil {
+		return err
+	}
+	return json.Unmarshal(input, &ma.original)
+}
+
+// MarshalJSON marshals the original value
+func (ma *MixedcaseAddress) MarshalJSON() ([]byte, error) {
+	return json.Marshal(ma.original)
+}
+
+// Address returns the address
+func (ma *MixedcaseAddress) Address() Address {
+	return ma.addr
+}
+
+// String implements fmt.Stringer
+func (ma *MixedcaseAddress) String() string {
+	if ma.ValidChecksum() {
+		return fmt.Sprintf("%s [chksum ok]", ma.original)
+	}
+	return fmt.Sprintf("%s [chksum INVALID]", ma.original)
+}
+
+// ValidChecksum returns true if the address has valid checksum
+func (ma *MixedcaseAddress) ValidChecksum() bool {
+	return ma.original == ma.addr.Hex()
+}
+
+// Original returns the mixed-case input string
+func (ma *MixedcaseAddress) Original() string {
+	return ma.original
+}

common/types_test.go

@@ -18,6 +18,7 @@ package common
 
 import (
 	"encoding/json"
+
 	"math/big"
 	"strings"
 	"testing"
@@ -149,3 +150,46 @@ func BenchmarkAddressHex(b *testing.B) {
 		testAddr.Hex()
 	}
 }
+
+func TestMixedcaseAccount_Address(t *testing.T) {
+
+	// https://github.com/ethereum/EIPs/blob/master/EIPS/eip-55.md
+	// Note: 0X{checksum_addr} is not valid according to spec above
+
+	var res []struct {
+		A     MixedcaseAddress
+		Valid bool
+	}
+	if err := json.Unmarshal([]byte(`[
+		{"A" : "0xae967917c465db8578ca9024c205720b1a3651A9", "Valid": false},
+		{"A" : "0xAe967917c465db8578ca9024c205720b1a3651A9", "Valid": true},
+		{"A" : "0XAe967917c465db8578ca9024c205720b1a3651A9", "Valid": false},
+		{"A" : "0x1111111111111111111112222222222223333323", "Valid": true}
+		]`), &res); err != nil {
+		t.Fatal(err)
+	}
+
+	for _, r := range res {
+		if got := r.A.ValidChecksum(); got != r.Valid {
+			t.Errorf("Expected checksum %v, got checksum %v, input %v", r.Valid, got, r.A.String())
+		}
+	}
+
+	//These should throw exceptions:
+	var r2 []MixedcaseAddress
+	for _, r := range []string{
+		`["0x11111111111111111111122222222222233333"]`,     // Too short
+		`["0x111111111111111111111222222222222333332"]`,    // Too short
+		`["0x11111111111111111111122222222222233333234"]`,  // Too long
+		`["0x111111111111111111111222222222222333332344"]`, // Too long
+		`["1111111111111111111112222222222223333323"]`,     // Missing 0x
+		`["x1111111111111111111112222222222223333323"]`,    // Missing 0
+		`["0xG111111111111111111112222222222223333323"]`,   //Non-hex
+	} {
+		if err := json.Unmarshal([]byte(r), &r2); err == nil {
+			t.Errorf("Expected failure, input %v", r)
+		}
+
+	}
+
+}

rpc/client.go

@@ -215,7 +215,6 @@ func (io StdIOConn) SetWriteDeadline(t time.Time) error {
 	return &net.OpError{Op: "set", Net: "stdio", Source: nil, Addr: nil, Err: errors.New("deadline not supported")}
 }
 func DialStdIO(ctx context.Context) (*Client, error) {
-
 	return newClient(ctx, func(_ context.Context) (net.Conn, error) {
 		return StdIOConn{}, nil
 	})
@@ -227,7 +226,6 @@ func newClient(initctx context.Context, connectFunc func(context.Context) (net.C
 		return nil, err
 	}
 	_, isHTTP := conn.(*httpConn)
-
 	c := &Client{
 		writeConn:   conn,
 		isHTTP:      isHTTP,
@@ -567,13 +565,13 @@ func (c *Client) dispatch(conn net.Conn) {
 			}
 
 		case err := <-c.readErr:
-			log.Debug(fmt.Sprintf("<-readErr: %v", err))
+			log.Debug("<-readErr", "err", err)
 			c.closeRequestOps(err)
 			conn.Close()
 			reading = false
 
 		case newconn := <-c.reconnected:
-			log.Debug(fmt.Sprintf("<-reconnected: (reading=%t) %v", reading, conn.RemoteAddr()))
+			log.Debug("<-reconnected", "reading", reading, "remote", conn.RemoteAddr())
 			if reading {
 				// Wait for the previous read loop to exit. This is a rare case.
 				conn.Close()
@@ -630,7 +628,7 @@ func (c *Client) closeRequestOps(err error) {
 
 func (c *Client) handleNotification(msg *jsonrpcMessage) {
 	if !strings.HasSuffix(msg.Method, notificationMethodSuffix) {
-		log.Debug(fmt.Sprint("dropping non-subscription message: ", msg))
+		log.Debug("dropping non-subscription message", "msg", msg)
 		return
 	}
 	var subResult struct {
@@ -638,7 +636,7 @@ func (c *Client) handleNotification(msg *jsonrpcMessage) {
 		Result json.RawMessage `json:"result"`
 	}
 	if err := json.Unmarshal(msg.Params, &subResult); err != nil {
-		log.Debug(fmt.Sprint("dropping invalid subscription message: ", msg))
+		log.Debug("dropping invalid subscription message", "msg", msg)
 		return
 	}
 	if c.subs[subResult.ID] != nil {
@@ -649,7 +647,7 @@ func (c *Client) handleNotification(msg *jsonrpcMessage) {
 func (c *Client) handleResponse(msg *jsonrpcMessage) {
 	op := c.respWait[string(msg.ID)]
 	if op == nil {
-		log.Debug(fmt.Sprintf("unsolicited response %v", msg))
+		log.Debug("unsolicited response", "msg", msg)
 		return
 	}
 	delete(c.respWait, string(msg.ID))