279 lines
8.8 KiB
Go
279 lines
8.8 KiB
Go
package ethtransferhelper
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import (
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"context"
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"crypto/ecdsa"
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"errors"
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"fmt"
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"math/big"
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"regexp"
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"strings"
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"github.com/ethereum/go-ethereum"
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"github.com/ethereum/go-ethereum/common"
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"github.com/ethereum/go-ethereum/core/types"
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"github.com/ethereum/go-ethereum/crypto"
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"github.com/ethereum/go-ethereum/ethclient"
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"github.com/shopspring/decimal"
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"golang.org/x/crypto/sha3"
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)
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// TransferErc20 发送 ERC-20 代币交易。
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// tokenaddress: ERC-20 代币的合约地址。 如果为空则转移ETH
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func TransferErc20(
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client *ethclient.Client,
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fromPrivateKey string,
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tokenAddress string,
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toAddress string,
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tokenAmount decimal.Decimal,
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tokenDecimals uint8) (*types.Transaction, error) {
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switch tokenAddress {
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case "":
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return TransferEth(client, fromPrivateKey, toAddress, tokenAmount)
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default:
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return TransferErc20Token(client, fromPrivateKey, tokenAddress, toAddress, tokenAmount, tokenDecimals)
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}
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}
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// TransferEth 发送 ETH 交易。
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func TransferEth(client *ethclient.Client, fromPrivateKey string, toAddress string, tokenAmount decimal.Decimal) (*types.Transaction, error) {
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// 1. 解析私钥
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privateKey, fromAddressCommon, err := GetAddressFromPrivateKey(fromPrivateKey)
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if err != nil {
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return nil, err
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}
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// 3. 获取发送者的 nonce（交易序号）
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nonce, err := client.PendingNonceAt(context.Background(), fromAddressCommon)
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if err != nil {
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return nil, fmt.Errorf("获取 nonce 失败: %w", err)
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}
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// 4. 设置交易的 value (对于代币转账，value 是 0)
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value, _ := convertDecimalToBigInt(tokenAmount, 18)
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// 5. 获取 Gas 价格
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gasPrice, err := client.SuggestGasPrice(context.Background())
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if err != nil {
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return nil, fmt.Errorf("获取 Gas 价格失败: %w", err)
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}
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// 6. 将地址字符串转换为 common.Address 类型
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toAddressCommon := common.HexToAddress(toAddress)
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// 7. 构造 ERC-20 transfer 函数的调用数据
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// 7.1 函数签名：transfer(address,uint256)
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transferFnSignature := "transfer(address,uint256)" // 已经是标准化的
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hash := sha3.NewLegacyKeccak256() // 或 sha3.NewLegacyKeccak256()
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hash.Write([]byte(transferFnSignature))
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// 7.4 拼接调用数据
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var data []byte
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// 8. 估算 Gas 消耗
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gasLimit, err := client.EstimateGas(context.Background(), ethereum.CallMsg{
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From: fromAddressCommon,
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To: &toAddressCommon,
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Data: data,
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})
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if err != nil {
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return nil, fmt.Errorf("估算 Gas 消耗失败: %w", err)
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}
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// 9. (预估gas+基础费用)*1.1 作为 GasLimit
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gasLimit = (gasLimit + 21000) * 12 / 10 // 增加 20%
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if gasLimit < 23000 {
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gasLimit = 23000 // 最小 Gas 限制
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}
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// 10. 创建交易
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tx := types.NewTransaction(nonce, toAddressCommon, value, gasLimit, gasPrice, data)
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// 11. 获取链 ID
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chainID, err := client.NetworkID(context.Background())
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if err != nil {
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return nil, fmt.Errorf("获取链 ID 失败: %w", err)
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}
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// 12. 签名交易
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signedTx, err := types.SignTx(tx, types.NewEIP155Signer(chainID), privateKey)
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if err != nil {
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return nil, fmt.Errorf("签名交易失败: %w", err)
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}
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// 13. 发送交易
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err = client.SendTransaction(context.Background(), signedTx)
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if err != nil {
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return nil, fmt.Errorf("发送交易失败: %w", err)
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}
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return signedTx, nil
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}
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// transferErc20Token 发送 ERC-20 代币交易。
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// tokenAmount: 要发送的代币数量 (例如，1.0 代表 1 个代币)。
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// fromPrivateKey: 发送者的私钥。
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// tokenAddress: ERC-20 代币的合约地址。
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// toAddress: 接收者的地址。
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// tokenDecimals: 代币的小数位数 (例如，USDC 是 6，很多其他代币是 18)。
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func TransferErc20Token(
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client *ethclient.Client,
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fromPrivateKey string,
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tokenAddress string,
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toAddress string,
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tokenAmount decimal.Decimal,
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tokenDecimals uint8,
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) (*types.Transaction, error) {
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// 1. 解析私钥
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privateKey, fromAddressCommon, err := GetAddressFromPrivateKey(fromPrivateKey)
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if err != nil {
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return nil, err
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}
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// 3. 获取发送者的 nonce（交易序号）
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nonce, err := client.PendingNonceAt(context.Background(), fromAddressCommon)
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if err != nil {
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return nil, fmt.Errorf("获取 nonce 失败: %w", err)
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}
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// 4. 设置交易的 value (对于代币转账，value 是 0)
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value := big.NewInt(0) // 不发送 ETH
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// 5. 获取 Gas 价格
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gasPrice, err := client.SuggestGasPrice(context.Background())
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if err != nil {
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return nil, fmt.Errorf("获取 Gas 价格失败: %w", err)
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}
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// 6. 将地址字符串转换为 common.Address 类型
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toAddressCommon := common.HexToAddress(toAddress)
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tokenAddressCommon := common.HexToAddress(tokenAddress)
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// 7. 构造 ERC-20 transfer 函数的调用数据
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// 7.1 函数签名：transfer(address,uint256)
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transferFnSignature := "transfer(address,uint256)" // 已经是标准化的
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hash := sha3.NewLegacyKeccak256() // 或 sha3.NewLegacyKeccak256()
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hash.Write([]byte(transferFnSignature))
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methodID := hash.Sum(nil)[:4]
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// 7.2 填充接收者地址和转账金额
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paddedAddress := common.LeftPadBytes(toAddressCommon.Bytes(), 32)
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// 7.3 将代币数量转换为最小单位
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amountBigInt, err := convertDecimalToBigInt(tokenAmount, tokenDecimals)
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if err != nil {
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return nil, fmt.Errorf("转换代币数量失败: %w", err)
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}
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paddedAmount := common.LeftPadBytes(amountBigInt.Bytes(), 32)
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// 7.4 拼接调用数据
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var data []byte
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data = append(data, methodID...)
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data = append(data, paddedAddress...)
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data = append(data, paddedAmount...)
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// 8. 估算 Gas 消耗
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gasLimit, err := client.EstimateGas(context.Background(), ethereum.CallMsg{
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From: fromAddressCommon,
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To: &toAddressCommon,
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Data: data,
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})
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if err != nil {
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return nil, fmt.Errorf("估算 Gas 消耗失败: %w", err)
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}
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// 9. (预估gas+基础费用)*1.1 作为 GasLimit
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gasLimit = (gasLimit + 21000) * 12 / 10 // 增加 20%
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if gasLimit < 23000 {
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gasLimit = 23000 // 最小 Gas 限制
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}
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// 10. 创建交易
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tx := types.NewTransaction(nonce, tokenAddressCommon, value, gasLimit, gasPrice, data)
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// 11. 获取链 ID
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chainID, err := client.NetworkID(context.Background())
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if err != nil {
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return nil, fmt.Errorf("获取链 ID 失败: %w", err)
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}
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// 12. 签名交易
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signedTx, err := types.SignTx(tx, types.NewEIP155Signer(chainID), privateKey)
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if err != nil {
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return nil, fmt.Errorf("签名交易失败: %w", err)
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}
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// 13. 发送交易
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err = client.SendTransaction(context.Background(), signedTx)
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if err != nil {
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return nil, fmt.Errorf("发送交易失败: %w", err)
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}
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return signedTx, nil
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}
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// getAddressFromPrivateKey 从私钥获取公钥和地址。
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func GetAddressFromPrivateKey(fromPrivateKey string) (*ecdsa.PrivateKey, common.Address, error) {
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// 1. 移除 "0x" 前缀（如果存在）
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if strings.HasPrefix(fromPrivateKey, "0x") {
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fromPrivateKey = fromPrivateKey[2:]
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}
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privateKey, err := crypto.HexToECDSA(fromPrivateKey)
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if err != nil {
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return nil, common.Address{}, fmt.Errorf("解析私钥失败: %w", err)
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}
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// 2. 从私钥获取公钥和发送者地址
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publicKey := privateKey.Public()
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publicKeyECDSA, ok := publicKey.(*ecdsa.PublicKey)
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if !ok {
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return nil, common.Address{}, errors.New("无法将公钥转换为 ECDSA 类型")
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}
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fromAddressCommon := crypto.PubkeyToAddress(*publicKeyECDSA)
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return privateKey, fromAddressCommon, nil
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}
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// convertTokenAmountToBigInt 将代币数量 (例如，1.0) 转换为最小单位的整数表示 (例如，USDC 的 1000000)。
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func convertDecimalToBigInt(amountDecimal decimal.Decimal, tokenDecimals uint8) (*big.Int, error) {
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// 1. 创建一个与 token decimals 精度相同的 10 的幂
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exponent := new(big.Int).Exp(big.NewInt(10), big.NewInt(int64(tokenDecimals)), nil)
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// 2. 将 decimal 乘以该 10 的幂
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amountScaled := amountDecimal.Mul(decimal.NewFromBigInt(exponent, 0))
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// 3. 将 scaled decimal 转换为 big.Int
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amountBigInt := amountScaled.BigInt()
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return amountBigInt, nil
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}
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// GetTransactionByHash 获取交易的状态。
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// status 0:失败 1-成功
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// error: 交易未确认或不存在
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func GetTransactionByHash(client *ethclient.Client, hash string) (int, error) {
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txHash := common.HexToHash(hash)
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// 获取交易收据（包含状态）
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receipt, err := client.TransactionReceipt(context.Background(), txHash)
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if err != nil {
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return 0, errors.New("交易未确认或不存在")
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}
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return int(receipt.Status), nil
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}
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// 校验钱包地址是否合法
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func IsValidAddress(address string) bool {
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if !strings.HasPrefix(address, "0x") {
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address = "0x" + address
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}
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if len(address) != 42 {
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return false
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}
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if !regexp.MustCompile(`^0x[0-9a-fA-F]{40}$`).MatchString(address) {
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return false
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}
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checksumAddress := common.HexToAddress(address).String()
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return address == checksumAddress
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}
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