Merge pull request #5 from mappum/develop

Fix hex string handling

client/http_client.go

@@ -4,10 +4,12 @@ import (
 	"bytes"
 	"encoding/json"
 	"errors"
+	"fmt"
 	"io/ioutil"
 	"net"
 	"net/http"
 	"net/url"
+	"reflect"
 	"strings"
 
 	. "github.com/tendermint/go-common"
@@ -119,7 +121,7 @@ func (c *ClientURI) call(method string, params map[string]interface{}, result in
 	if err != nil {
 		return nil, err
 	}
-	//log.Info(Fmt("URI request to %v (%v): %v", c.address, method, values))
+	// log.Info(Fmt("URI request to %v (%v): %v", c.address, method, values))
 	resp, err := c.client.PostForm(c.address+"/"+method, values)
 	if err != nil {
 		return nil, err
@@ -176,6 +178,14 @@ func argsToJson(args map[string]interface{}) error {
 	var n int
 	var err error
 	for k, v := range args {
+		// Convert byte slices to "0x"-prefixed hex
+		byteSlice, isByteSlice := reflect.ValueOf(v).Interface().([]byte)
+		if isByteSlice {
+			args[k] = fmt.Sprintf("0x%X", byteSlice)
+			continue
+		}
+
+		// Pass everything else to go-wire
 		buf := new(bytes.Buffer)
 		wire.WriteJSON(v, buf, &n, &err)
 		if err != nil {

rpc_test.go

@@ -164,3 +164,39 @@ func TestWS_UNIX(t *testing.T) {
 	}
 	testWS(t, cl)
 }
+
+func TestHexStringArg(t *testing.T) {
+	cl := rpcclient.NewClientURI(tcpAddr)
+	// should NOT be handled as hex
+	val := "0xabc"
+	params := map[string]interface{}{
+		"arg": val,
+	}
+	var result Result
+	_, err := cl.Call("status", params, &result)
+	if err != nil {
+		t.Fatal(err)
+	}
+	got := result.(*ResultStatus).Value
+	if got != val {
+		t.Fatalf("Got: %v   ....   Expected: %v \n", got, val)
+	}
+}
+
+func TestQuotedStringArg(t *testing.T) {
+	cl := rpcclient.NewClientURI(tcpAddr)
+	// should NOT be unquoted
+	val := "\"abc\""
+	params := map[string]interface{}{
+		"arg": val,
+	}
+	var result Result
+	_, err := cl.Call("status", params, &result)
+	if err != nil {
+		t.Fatal(err)
+	}
+	got := result.(*ResultStatus).Value
+	if got != val {
+		t.Fatalf("Got: %v   ....   Expected: %v \n", got, val)
+	}
+}

server/handlers.go

@@ -2,6 +2,7 @@ package rpcserver
 
 import (
 	"bytes"
+	"encoding/hex"
 	"encoding/json"
 	"errors"
 	"fmt"
@@ -224,12 +225,22 @@ func httpParamsToArgs(rpcFunc *RPCFunc, r *http.Request) ([]reflect.Value, error
 	argTypes := rpcFunc.args
 	argNames := rpcFunc.argNames
 
-	var err error
 	values := make([]reflect.Value, len(argNames))
 	for i, name := range argNames {
 		ty := argTypes[i]
 		arg := GetParam(r, name)
-		//log.Notice("param to arg", "ty", ty, "name", name, "arg", arg)
+		// log.Notice("param to arg", "ty", ty, "name", name, "arg", arg)
+
+		v, err, ok := nonJsonToArg(ty, arg)
+		if err != nil {
+			return nil, err
+		}
+		if ok {
+			values[i] = v
+			continue
+		}
+
+		// Pass values to go-wire
 		values[i], err = _jsonStringToArg(ty, arg)
 		if err != nil {
 			return nil, err
@@ -249,6 +260,44 @@ func _jsonStringToArg(ty reflect.Type, arg string) (reflect.Value, error) {
 	return v, nil
 }
 
+func nonJsonToArg(ty reflect.Type, arg string) (reflect.Value, error, bool) {
+	isQuotedString := strings.HasPrefix(arg, `"`) && strings.HasSuffix(arg, `"`)
+	isHexString := strings.HasPrefix(strings.ToLower(arg), "0x")
+	expectingString := ty.Kind() == reflect.String
+	expectingByteSlice := ty.Kind() == reflect.Slice && ty.Elem().Kind() == reflect.Uint8
+
+	if isHexString {
+		if !expectingString && !expectingByteSlice {
+			err := fmt.Errorf("Got a hex string arg, but expected '%s'",
+				ty.Kind().String())
+			return reflect.ValueOf(nil), err, false
+		}
+
+		var value []byte
+		value, err := hex.DecodeString(arg[2:])
+		if err != nil {
+			return reflect.ValueOf(nil), err, false
+		}
+		if ty.Kind() == reflect.String {
+			return reflect.ValueOf(string(value)), nil, true
+		}
+		return reflect.ValueOf([]byte(value)), nil, true
+	}
+
+	if isQuotedString && expectingByteSlice {
+		var err error
+		v := reflect.New(reflect.TypeOf(""))
+		wire.ReadJSONPtr(v.Interface(), []byte(arg), &err)
+		if err != nil {
+			return reflect.ValueOf(nil), err, false
+		}
+		v = v.Elem()
+		return reflect.ValueOf([]byte(v.String())), nil, true
+	}
+
+	return reflect.ValueOf(nil), nil, false
+}
+
 // rpc.http
 //-----------------------------------------------------------------------------
 // rpc.websocket

test/test.sh

@@ -6,18 +6,52 @@ go build -o server main.go
 PID=$!
 sleep 2
 
-
+# simple request
 R1=`curl -s 'http://localhost:8008/hello_world?name="my_world"&num=5'`
-
-
 R2=`curl -s --data @data.json http://localhost:8008`
-
-kill -9 $PID
-
 if [[ "$R1" != "$R2" ]]; then
 	echo "responses are not identical:"
 	echo "R1: $R1"
 	echo "R2: $R2"
 	exit 1
+else
+	echo "Success"
 fi
-echo "Success"
+
+# request with 0x-prefixed hex string arg
+R1=`curl -s 'http://localhost:8008/hello_world?name=0x41424344&num=123'`
+R2='{"jsonrpc":"2.0","id":"","result":{"Result":"hi ABCD 123"},"error":""}'
+if [[ "$R1" != "$R2" ]]; then
+	echo "responses are not identical:"
+	echo "R1: $R1"
+	echo "R2: $R2"
+	exit 1
+else
+	echo "Success"
+fi
+
+# request with unquoted string arg
+R1=`curl -s 'http://localhost:8008/hello_world?name=abcd&num=123'`
+R2="{\"jsonrpc\":\"2.0\",\"id\":\"\",\"result\":null,\"error\":\"Error converting http params to args: invalid character 'a' looking for beginning of value\"}"
+if [[ "$R1" != "$R2" ]]; then
+	echo "responses are not identical:"
+	echo "R1: $R1"
+	echo "R2: $R2"
+	exit 1
+else
+	echo "Success"
+fi
+
+# request with string type when expecting number arg
+R1=`curl -s 'http://localhost:8008/hello_world?name="abcd"&num=0xabcd'`
+R2="{\"jsonrpc\":\"2.0\",\"id\":\"\",\"result\":null,\"error\":\"Error converting http params to args: Got a 'hex string' arg, but expected 'int'\"}"
+if [[ "$R1" != "$R2" ]]; then
+	echo "responses are not identical:"
+	echo "R1: $R1"
+	echo "R2: $R2"
+	exit 1
+else
+	echo "Success"
+fi
+
+kill -9 $PID || exit 0