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Copy pathsolidity.go
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94 lines (84 loc) · 2.44 KB
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// Copyright © 2017 - 2023 Weald Technology Trading.
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package util
import (
"encoding/hex"
"encoding/json"
"fmt"
"os"
"strings"
"github.com/ethereum/go-ethereum/accounts/abi"
"github.com/pkg/errors"
)
// Contract contains some basic information about a contract.
type Contract struct {
Name string
Abi abi.ABI
Binary []byte
}
// ParseCombinedJSON parses a combined JSON output of solc for a specific contract.
func ParseCombinedJSON(input string, name string) (*Contract, error) {
var err error
var data []byte
if strings.HasPrefix(input, "{") {
data = []byte(input)
} else {
// Input is a filename.
data, err = os.ReadFile(input)
if err != nil {
return nil, err
}
}
var contractsJSON map[string]any
err = json.Unmarshal(data, &contractsJSON)
if err != nil {
return nil, err
}
contracts, exists := contractsJSON["contracts"]
if !exists {
return nil, errors.New("JSON does not contain contracts element")
}
contractsMap := contracts.(map[string]any)
// See if this is our name.
for contractKey, contractValue := range contractsMap {
if strings.HasSuffix(contractKey, fmt.Sprintf(":%s", name)) {
// Found our contract.
contract := &Contract{Name: name}
contractJSON := contractValue.(map[string]any)
// Obtain ABI.
abiJSON, exists := contractJSON["abi"]
if exists {
bytes, err := json.Marshal(abiJSON)
if err != nil {
return nil, err
}
var abi abi.ABI
if err := json.Unmarshal(bytes, &abi); err != nil {
return nil, errors.Wrap(err, "failed to decode json")
}
contract.Abi = abi
}
// Obtain binary.
binStr, exists := contractJSON["bin"]
if exists {
bin, err := hex.DecodeString(binStr.(string))
if err != nil {
return nil, err
}
contract.Binary = bin
}
return contract, nil
}
}
return nil, fmt.Errorf("no contract \"%s\" in JSON; use --name to provide the name of the contract", name)
}