地址验证 · 区块链之以太坊钱包

--- 概述: 用Go检查地址是智能合约或账户的教程。 --- # 地址检查本节将介绍如何确认一个地址并确定其是否为智能合约地址。 ## 检查地址是否有效我们可以使用简单的正则表达式来检查以太坊地址是否有效： We can use a simple regular expression to check if the ethereum address is valid: ```go re := regexp.MustCompile("^0x[0-9a-fA-F]{40}$") fmt.Printf("is valid: %v\n", re.MatchString("0x323b5d4c32345ced77393b3530b1eed0f346429d")) // is valid: true fmt.Printf("is valid: %v\n", re.MatchString("0xZYXb5d4c32345ced77393b3530b1eed0f346429d")) // is valid: false ``` ## 检查地址是否为账户或智能合约我们可以确定，若在该地址存储了字节码，该地址是智能合约。这是一个示例，在例子中，我们获取一个代币智能合约的字节码并检查其长度以验证它是一个智能合约： ```go // 0x Protocol Token (ZRX) smart contract address address := common.HexToAddress("0xe41d2489571d322189246dafa5ebde1f4699f498") bytecode, err := client.CodeAt(context.Background(), address, nil) // nil is latest block if err != nil { log.Fatal(err) } isContract := len(bytecode) > 0 fmt.Printf("is contract: %v\n", isContract) // is contract: true ``` 当地址上没有字节码时，我们知道它不是一个智能合约，它是一个标准的以太坊账户。 ```go // a random user account address address := common.HexToAddress("0x8e215d06ea7ec1fdb4fc5fd21768f4b34ee92ef4") bytecode, err := client.CodeAt(context.Background(), address, nil) // nil is latest block if err != nil { log.Fatal(err) } isContract = len(bytecode) > 0 fmt.Printf("is contract: %v\n", isContract) // is contract: false ``` --- ### 完整代码 ```go package main import ( "context" "fmt" "log" "regexp" "github.com/ethereum/go-ethereum/common" "github.com/ethereum/go-ethereum/ethclient" ) func main() { re := regexp.MustCompile("^0x[0-9a-fA-F]{40}$") fmt.Printf("is valid: %v\n", re.MatchString("0x323b5d4c32345ced77393b3530b1eed0f346429d")) // is valid: true fmt.Printf("is valid: %v\n", re.MatchString("0xZYXb5d4c32345ced77393b3530b1eed0f346429d")) // is valid: false client, err := ethclient.Dial("https://mainnet.infura.io") if err != nil { log.Fatal(err) } // 0x Protocol Token (ZRX) smart contract address address := common.HexToAddress("0xe41d2489571d322189246dafa5ebde1f4699f498") bytecode, err := client.CodeAt(context.Background(), address, nil) // nil is latest block if err != nil { log.Fatal(err) } isContract := len(bytecode) > 0 fmt.Printf("is contract: %v\n", isContract) // is contract: true // a random user account address address = common.HexToAddress("0x8e215d06ea7ec1fdb4fc5fd21768f4b34ee92ef4") bytecode, err = client.CodeAt(context.Background(), address, nil) // nil is latest block if err != nil { log.Fatal(err) } isContract = len(bytecode) > 0 fmt.Printf("is contract: %v\n", isContract) // is contract: false } ```