El uso del método "addr" de la biblioteca web3swift en el desarrollo de iOS de la cadena de bloques Ethereum

Debido a que la biblioteca web3swift no es perfecta, falta el método "addr" en la prueba unitaria, y necesito usarlo en el proceso de desarrollo, es decir: convertir el nombre de dominio ENS en una dirección hexadecimal; entonces escribí un artículo como registro, espero lo mismo Se pueden usar los mismos zapatos que se requieran.

Primero, debemos presentar la biblioteca web3swift, dirección: https://github.com/BANKEX/web3swift

//MARK:将ENS域名转成16进制地址字符串
    func keccakHexStringFromENSString (inputName: String) -> String {
        
        var node = ""
        for _ in 0..<32 {
            node += "00"
        }

        let name = normalize(name: inputName)
    
        if name.count > 0 {
            //将字符串用“.”分割成数组并将数组倒序
            var labels = name.split(separator: ".")
            labels.reverse()
            

            //递归
            for subLabels in labels {

                let str = String(subLabels)
                var labbelSha = str.sha3(.keccak256)
                labbelSha = "0x" + node + labbelSha
                let data = convertToData(labbelSha as AnyObject)
                node = (data?.sha3(.keccak256).toHexString())!
                print("0x" + node)
            }
        }
        return infuratestResolver(encodeStr: "0x" + node)
    }

    //将某类型转成Data
    func convertToData(_ value: AnyObject) -> Data? {
        switch value {
        case let d as Data:
            return d
        case let d as String:
            if d.hasHexPrefix() {
                let hex = Data.fromHex(d)
                if hex != nil {
                    return hex
                }
            }
            let str = d.data(using: .utf8)
            if str != nil {
                return str
            }
        case let d as [UInt8]:
            return Data(d)
        case let d as EthereumAddress:
            return d.addressData
        case let d as [IntegerLiteralType]:
            var bytesArray = [UInt8]()
            for el in d {
                guard el >= 0, el <= 255 else {return nil}
                bytesArray.append(UInt8(el))
            }
            return Data(bytesArray)
        default:
            return nil
        }
        return nil
    }
    
    func normalize(name: String) -> String {
        var lastName = name.trimmingCharacters(in: .whitespaces)
        //判断表情的正则表达式，并把表情替换为空
        let pattern = "[\\ud83c\\udc00-\\ud83c\\udfff]|[\\ud83d\\udc00-\\ud83d\\udfff]|[\\u2600-\\u27ff]"
        lastName = lastName.pregReplace(pattern: pattern, with: "")
        return lastName
    }
    
    //执行"addr"方法
    func infuratestResolver(encodeStr: String) -> String {
        let jsonString = "[{\"constant\":true,\"inputs\":[{\"name\":\"interfaceID\",\"type\":\"bytes4\"}],\"name\":\"supportsInterface\",\"outputs\":[{\"name\":\"\",\"type\":\"bool\"}],\"payable\":false,\"type\":\"function\"},{\"constant\":true,\"inputs\":[{\"name\":\"node\",\"type\":\"bytes32\"},{\"name\":\"contentTypes\",\"type\":\"uint256\"}],\"name\":\"ABI\",\"outputs\":[{\"name\":\"contentType\",\"type\":\"uint256\"},{\"name\":\"data\",\"type\":\"bytes\"}],\"payable\":false,\"type\":\"function\"},{\"constant\":false,\"inputs\":[{\"name\":\"node\",\"type\":\"bytes32\"},{\"name\":\"x\",\"type\":\"bytes32\"},{\"name\":\"y\",\"type\":\"bytes32\"}],\"name\":\"setPubkey\",\"outputs\":[],\"payable\":false,\"type\":\"function\"},{\"constant\":true,\"inputs\":[{\"name\":\"node\",\"type\":\"bytes32\"}],\"name\":\"content\",\"outputs\":[{\"name\":\"ret\",\"type\":\"bytes32\"}],\"payable\":false,\"type\":\"function\"},{\"constant\":true,\"inputs\":[{\"name\":\"node\",\"type\":\"bytes32\"}],\"name\":\"addr\",\"outputs\":[{\"name\":\"ret\",\"type\":\"address\"}],\"payable\":false,\"type\":\"function\"},{\"constant\":false,\"inputs\":[{\"name\":\"node\",\"type\":\"bytes32\"},{\"name\":\"contentType\",\"type\":\"uint256\"},{\"name\":\"data\",\"type\":\"bytes\"}],\"name\":\"setABI\",\"outputs\":[],\"payable\":false,\"type\":\"function\"},{\"constant\":true,\"inputs\":[{\"name\":\"node\",\"type\":\"bytes32\"}],\"name\":\"name\",\"outputs\":[{\"name\":\"ret\",\"type\":\"string\"}],\"payable\":false,\"type\":\"function\"},{\"constant\":false,\"inputs\":[{\"name\":\"node\",\"type\":\"bytes32\"},{\"name\":\"name\",\"type\":\"string\"}],\"name\":\"setName\",\"outputs\":[],\"payable\":false,\"type\":\"function\"},{\"constant\":false,\"inputs\":[{\"name\":\"node\",\"type\":\"bytes32\"},{\"name\":\"hash\",\"type\":\"bytes32\"}],\"name\":\"setContent\",\"outputs\":[],\"payable\":false,\"type\":\"function\"},{\"constant\":true,\"inputs\":[{\"name\":\"node\",\"type\":\"bytes32\"}],\"name\":\"pubkey\",\"outputs\":[{\"name\":\"x\",\"type\":\"bytes32\"},{\"name\":\"y\",\"type\":\"bytes32\"}],\"payable\":false,\"type\":\"function\"},{\"constant\":false,\"inputs\":[{\"name\":\"node\",\"type\":\"bytes32\"},{\"name\":\"addr\",\"type\":\"address\"}],\"name\":\"setAddr\",\"outputs\":[],\"payable\":false,\"type\":\"function\"},{\"inputs\":[{\"name\":\"ensAddr\",\"type\":\"address\"}],\"payable\":false,\"type\":\"constructor\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":true,\"name\":\"node\",\"type\":\"bytes32\"},{\"indexed\":false,\"name\":\"a\",\"type\":\"address\"}],\"name\":\"AddrChanged\",\"type\":\"event\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":true,\"name\":\"node\",\"type\":\"bytes32\"},{\"indexed\":false,\"name\":\"hash\",\"type\":\"bytes32\"}],\"name\":\"ContentChanged\",\"type\":\"event\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":true,\"name\":\"node\",\"type\":\"bytes32\"},{\"indexed\":false,\"name\":\"name\",\"type\":\"string\"}],\"name\":\"NameChanged\",\"type\":\"event\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":true,\"name\":\"node\",\"type\":\"bytes32\"},{\"indexed\":true,\"name\":\"contentType\",\"type\":\"uint256\"}],\"name\":\"ABIChanged\",\"type\":\"event\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":true,\"name\":\"node\",\"type\":\"bytes32\"},{\"indexed\":false,\"name\":\"x\",\"type\":\"bytes32\"},{\"indexed\":false,\"name\":\"y\",\"type\":\"bytes32\"}],\"name\":\"PubkeyChanged\",\"type\":\"event\"}]"
        do {
            
            let web3 = Web3.InfuraMainnetWeb3()
            let constractAddress = EthereumAddress("0x1da022710dF5002339274AaDEe8D58218e9D6AB5")
            var options = Web3Options.defaultOptions()
            options.to = constractAddress
            options.from = constractAddress
            let parametersCall = [encodeStr] as [AnyObject]
            let contract = web3.contract(jsonString, at: constractAddress, abiVersion: 2)!
            let transaction = contract.method("addr", parameters:parametersCall,  options: options)
            guard let tokenNameRes = transaction?.call(options: options) else {return ""}
            guard case .success(let result) = tokenNameRes else {return ""}
            if result.isEmpty {
                return ""
            }else {
                let dictValuesArray = [Any](result.values)
                if dictValuesArray.count > 0 {
                    let addr: EthereumAddress = dictValuesArray[0] as! EthereumAddress
                    return addr.address
                }else {
                    return ""
                }
            }
        } catch {
            XCTFail()
            print(error)
            return ""
        }
    }
    
    //测试
    func testABI() {
        let ENSString = keccakHexStringFromENSString(inputName: "linktime.eth")
        print(ENSString)
    }