bind: Static byte arrays should be right-padded

Per https://solidity.readthedocs.io/en/v0.5.3/abi-spec.html:

"bytes<M>: enc(X) is the sequence of bytes in X padded with trailing zero-bytes to a length of 32 bytes"
This commit is contained in:
Jeremy McNevin 2019-01-28 12:47:24 -06:00 committed by Péter Szilágyi
parent 6c312a24b6
commit 7640c9c933
No known key found for this signature in database
GPG Key ID: E9AE538CEDF8293D
2 changed files with 109 additions and 2 deletions

View File

@ -83,8 +83,10 @@ func makeTopics(query ...[]interface{}) ([][]common.Hash, error) {
val := reflect.ValueOf(rule)
switch {
// static byte array
case val.Kind() == reflect.Array && reflect.TypeOf(rule).Elem().Kind() == reflect.Uint8:
reflect.Copy(reflect.ValueOf(topic[common.HashLength-val.Len():]), val)
reflect.Copy(reflect.ValueOf(topic[:val.Len()]), val)
default:
return nil, fmt.Errorf("unsupported indexed type: %T", rule)
@ -175,8 +177,10 @@ func parseTopics(out interface{}, fields abi.Arguments, topics []common.Hash) er
default:
// Ran out of custom types, try the crazies
switch {
// static byte array
case arg.Type.T == abi.FixedBytesTy:
reflect.Copy(field, reflect.ValueOf(topics[0][common.HashLength-arg.Type.Size:]))
reflect.Copy(field, reflect.ValueOf(topics[0][:arg.Type.Size]))
default:
return fmt.Errorf("unsupported indexed type: %v", arg.Type)

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@ -0,0 +1,103 @@
// 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 bind
import (
"reflect"
"testing"
"github.com/ethereum/go-ethereum/accounts/abi"
"github.com/ethereum/go-ethereum/common"
)
func Test_makeTopics(t *testing.T) {
type args struct {
query [][]interface{}
}
tests := []struct {
name string
args args
want [][]common.Hash
wantErr bool
}{
{
"support fixed byte types, right padded to 32 bytes",
args{[][]interface{}{{[5]byte{1, 2, 3, 4, 5}}}},
[][]common.Hash{{common.Hash{1, 2, 3, 4, 5}}},
false,
},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
got, err := makeTopics(tt.args.query...)
if (err != nil) != tt.wantErr {
t.Errorf("makeTopics() error = %v, wantErr %v", err, tt.wantErr)
return
}
if !reflect.DeepEqual(got, tt.want) {
t.Errorf("makeTopics() = %v, want %v", got, tt.want)
}
})
}
}
func Test_parseTopics(t *testing.T) {
type bytesStruct struct {
StaticBytes [5]byte
}
bytesType, _ := abi.NewType("bytes5", nil)
type args struct {
createObj func() interface{}
resultObj func() interface{}
fields abi.Arguments
topics []common.Hash
}
tests := []struct {
name string
args args
wantErr bool
}{
{
name: "support fixed byte types, right padded to 32 bytes",
args: args{
createObj: func() interface{} { return &bytesStruct{} },
resultObj: func() interface{} { return &bytesStruct{StaticBytes: [5]byte{1, 2, 3, 4, 5}} },
fields: abi.Arguments{abi.Argument{
Name: "staticBytes",
Type: bytesType,
Indexed: true,
}},
topics: []common.Hash{
{1, 2, 3, 4, 5},
},
},
wantErr: false,
},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
createObj := tt.args.createObj()
if err := parseTopics(createObj, tt.args.fields, tt.args.topics); (err != nil) != tt.wantErr {
t.Errorf("parseTopics() error = %v, wantErr %v", err, tt.wantErr)
}
resultObj := tt.args.resultObj()
if !reflect.DeepEqual(createObj, resultObj) {
t.Errorf("parseTopics() = %v, want %v", createObj, resultObj)
}
})
}
}