55 lines
2.2 KiB
C#
55 lines
2.2 KiB
C#
using System.Text;
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using Nethereum.Signer;
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using Nethereum.Util;
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using UnityEngine;
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using UnityEngine.SceneManagement;
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using UnityEngine.UI;
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using Web3Unity.Scripts.Library.Web3Wallet;
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public class WalletLogin : MonoBehaviour
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{
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public Toggle rememberMe;
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private void Start()
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{
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// if remember me is checked, set the account to the saved account
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if (PlayerPrefs.HasKey("RememberMe") && PlayerPrefs.HasKey("Account"))
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if (PlayerPrefs.GetInt("RememberMe") == 1 && PlayerPrefs.GetString("Account") != "")
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// move to next scene
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SceneManager.LoadScene(SceneManager.GetActiveScene().buildIndex + 1);
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}
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public async void OnLogin()
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{
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// get current timestamp
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var timestamp = (int)System.DateTime.UtcNow.Subtract(new System.DateTime(1970, 1, 1)).TotalSeconds;
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// set expiration time
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var expirationTime = timestamp + 60;
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// set message
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var message = expirationTime.ToString();
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// sign message
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var signature = await Web3Wallet.Sign(message);
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// verify account
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var account = SignVerifySignature(signature, message);
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var now = (int)System.DateTime.UtcNow.Subtract(new System.DateTime(1970, 1, 1)).TotalSeconds;
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// validate
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if (account.Length == 42 && expirationTime >= now)
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{
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// save account
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PlayerPrefs.SetString("Account", account);
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if (rememberMe.isOn)
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PlayerPrefs.SetInt("RememberMe", 1);
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else
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PlayerPrefs.SetInt("RememberMe", 0);
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print("Account: " + account);
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// load next scene
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SceneManager.LoadScene(SceneManager.GetActiveScene().buildIndex + 1);
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}
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}
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public string SignVerifySignature(string signatureString, string originalMessage)
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{
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var msg = "\x19" + "Ethereum Signed Message:\n" + originalMessage.Length + originalMessage;
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var msgHash = new Sha3Keccack().CalculateHash(Encoding.UTF8.GetBytes(msg));
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var signature = MessageSigner.ExtractEcdsaSignature(signatureString);
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var key = EthECKey.RecoverFromSignature(signature, msgHash);
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return key.GetPublicAddress();
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}
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} |