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LoadWalletViewModel.cs
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LoadWalletViewModel.cs
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using Avalonia;
using Avalonia.Controls;
using Avalonia.Threading;
using AvalonStudio.Extensibility;
using AvalonStudio.Shell;
using NBitcoin;
using Newtonsoft.Json;
using Newtonsoft.Json.Linq;
using Nito.AsyncEx;
using ReactiveUI;
using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.IO;
using System.Linq;
using System.Reactive;
using System.Runtime.InteropServices;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using WalletWasabi.Gui.Controls.WalletExplorer;
using WalletWasabi.Gui.Dialogs;
using WalletWasabi.Gui.Models;
using WalletWasabi.Gui.ViewModels;
using WalletWasabi.Helpers;
using WalletWasabi.Hwi;
using WalletWasabi.Hwi.Models;
using WalletWasabi.KeyManagement;
using WalletWasabi.Logging;
namespace WalletWasabi.Gui.Tabs.WalletManager
{
internal class LoadWalletViewModel : CategoryViewModel
{
private ObservableCollection<LoadWalletEntry> _wallets;
private string _password;
private LoadWalletEntry _selectedWallet;
private bool _isWalletSelected;
private bool _isWalletOpened;
private bool _canLoadWallet;
private bool _canTestPassword;
private string _warningMessage;
private string _validationMessage;
private string _successMessage;
private bool _isBusy;
private bool _isHardwareBusy;
private string _loadButtonText;
private bool _isHwWalletSearchTextVisible;
public bool IsLinux => RuntimeInformation.IsOSPlatform(OSPlatform.Linux);
private WalletManagerViewModel Owner { get; }
public Global Global => Owner.Global;
public LoadWalletType LoadWalletType { get; }
public bool IsPasswordRequired => LoadWalletType == LoadWalletType.Password;
public bool IsHardwareWallet => LoadWalletType == LoadWalletType.Hardware;
public bool IsDesktopWallet => LoadWalletType == LoadWalletType.Desktop;
private object WalletLock { get; }
public LoadWalletViewModel(WalletManagerViewModel owner, LoadWalletType loadWalletType) : base(loadWalletType == LoadWalletType.Password ? "Test Password" : (loadWalletType == LoadWalletType.Desktop ? "Load Wallet" : "Hardware Wallet"))
{
Owner = owner;
Password = "";
LoadWalletType = loadWalletType;
Wallets = new ObservableCollection<LoadWalletEntry>();
WalletLock = new object();
this.WhenAnyValue(x => x.SelectedWallet)
.Subscribe(selectedWallet => TrySetWalletStates());
this.WhenAnyValue(x => x.IsWalletOpened)
.Subscribe(isWalletOpened => TrySetWalletStates());
this.WhenAnyValue(x => x.IsBusy)
.Subscribe(x => TrySetWalletStates());
this.WhenAnyValue(x => x.Password).Subscribe(async x =>
{
try
{
if (x.NotNullAndNotEmpty())
{
char lastChar = x.Last();
if (lastChar == '\r' || lastChar == '\n') // If the last character is cr or lf then act like it'd be a sign to do the job.
{
Password = x.TrimEnd('\r', '\n');
await LoadKeyManagerAsync(requirePassword: true, isHardwareWallet: false);
}
}
}
catch (Exception ex)
{
Logger.LogTrace(ex);
}
});
LoadCommand = ReactiveCommand.CreateFromTask(async () => await LoadWalletAsync(), this.WhenAnyValue(x => x.CanLoadWallet));
TestPasswordCommand = ReactiveCommand.CreateFromTask(async () => await LoadKeyManagerAsync(requirePassword: true, isHardwareWallet: false), this.WhenAnyValue(x => x.CanTestPassword));
OpenFolderCommand = ReactiveCommand.Create(OpenWalletsFolder);
ImportColdcardCommand = ReactiveCommand.CreateFromTask(async () =>
{
try
{
var ofd = new OpenFileDialog
{
AllowMultiple = false,
Title = "Import Coldcard"
};
var selected = await ofd.ShowAsync(Application.Current.MainWindow, fallBack: true);
if (selected != null && selected.Any())
{
var path = selected.First();
var jsonString = await File.ReadAllTextAsync(path);
var json = JObject.Parse(jsonString);
var xpubString = json["ExtPubKey"].ToString();
var mfpString = json["MasterFingerprint"].ToString();
// https://github.com/zkSNACKs/WalletWasabi/pull/1663#issuecomment-508073066
// Coldcard 2.1.0 improperly implemented Wasabi skeleton fingerpring at first, so we must reverse byte order.
// The solution was to add a ColdCardFirmwareVersion json field from 2.1.1 and correct the one generated by 2.1.0.
var coldCardVersionString = json["ColdCardFirmwareVersion"]?.ToString();
var reverseByteOrder = false;
if (coldCardVersionString is null)
{
reverseByteOrder = true;
}
else
{
Version coldCardVersion = new Version(coldCardVersionString);
if (coldCardVersion == new Version("2.1.0")) // Should never happen though.
{
reverseByteOrder = true;
}
}
HDFingerprint mfp = NBitcoinHelpers.BetterParseHDFingerprint(mfpString, reverseByteOrder: reverseByteOrder);
ExtPubKey extPubKey = NBitcoinHelpers.BetterParseExtPubKey(xpubString);
Logger.LogInfo<LoadWalletViewModel>("Creating new wallet file.");
var walletName = Global.GetNextHardwareWalletName(customPrefix: "Coldcard");
var walletFullPath = Global.GetWalletFullPath(walletName);
KeyManager.CreateNewHardwareWalletWatchOnly(mfp, extPubKey, walletFullPath);
owner.SelectLoadWallet();
}
}
catch (Exception ex)
{
SetWarningMessage(ex.ToTypeMessageString());
Logger.LogError<LoadWalletViewModel>(ex);
}
}, outputScheduler: RxApp.MainThreadScheduler);
LoadCommand.ThrownExceptions.Subscribe(Logger.LogWarning<LoadWalletViewModel>);
TestPasswordCommand.ThrownExceptions.Subscribe(Logger.LogWarning<LoadWalletViewModel>);
OpenFolderCommand.ThrownExceptions.Subscribe(Logger.LogWarning<LoadWalletViewModel>);
ImportColdcardCommand.ThrownExceptions.Subscribe(Logger.LogWarning<LoadWalletViewModel>);
SetLoadButtonText();
IsHwWalletSearchTextVisible = LoadWalletType == LoadWalletType.Hardware;
}
public bool IsHwWalletSearchTextVisible
{
get => _isHwWalletSearchTextVisible;
set => this.RaiseAndSetIfChanged(ref _isHwWalletSearchTextVisible, value);
}
public ObservableCollection<LoadWalletEntry> Wallets
{
get => _wallets;
set => this.RaiseAndSetIfChanged(ref _wallets, value);
}
public string Password
{
get => _password;
set => this.RaiseAndSetIfChanged(ref _password, value);
}
public LoadWalletEntry SelectedWallet
{
get => _selectedWallet;
set => this.RaiseAndSetIfChanged(ref _selectedWallet, value);
}
public bool IsWalletSelected
{
get => _isWalletSelected;
set => this.RaiseAndSetIfChanged(ref _isWalletSelected, value);
}
public bool IsWalletOpened
{
get => _isWalletOpened;
set => this.RaiseAndSetIfChanged(ref _isWalletOpened, value);
}
public string WarningMessage
{
get => _warningMessage;
set => this.RaiseAndSetIfChanged(ref _warningMessage, value);
}
public string ValidationMessage
{
get => _validationMessage;
set => this.RaiseAndSetIfChanged(ref _validationMessage, value);
}
public string SuccessMessage
{
get => _successMessage;
set => this.RaiseAndSetIfChanged(ref _successMessage, value);
}
public void SetWarningMessage(string message)
{
WarningMessage = message;
ValidationMessage = "";
SuccessMessage = "";
}
public void SetValidationMessage(string message)
{
WarningMessage = "";
ValidationMessage = message;
SuccessMessage = "";
}
private void SetSuccessMessage(string message)
{
WarningMessage = "";
ValidationMessage = "";
SuccessMessage = message;
}
public void SetLoadButtonText()
{
if (IsHardwareBusy)
{
LoadButtonText = "Waiting for Hardware Wallet...";
}
else if (IsBusy)
{
LoadButtonText = "Loading...";
}
else
{
// If the hardware wallet was not initialized, then make the button say Setup, not Load.
LoadButtonText = SelectedWallet?.HardwareWalletInfo != null && !SelectedWallet.HardwareWalletInfo.Initialized
? "Setup Wallet"
: "Load Wallet";
}
}
public string LoadButtonText
{
get => _loadButtonText;
set => this.RaiseAndSetIfChanged(ref _loadButtonText, value);
}
public bool CanLoadWallet
{
get => _canLoadWallet;
set => this.RaiseAndSetIfChanged(ref _canLoadWallet, value);
}
public bool CanTestPassword
{
get => _canTestPassword;
set => this.RaiseAndSetIfChanged(ref _canTestPassword, value);
}
public bool IsBusy
{
get => _isBusy;
set => this.RaiseAndSetIfChanged(ref _isBusy, value);
}
public bool IsHardwareBusy
{
get => _isHardwareBusy;
set
{
this.RaiseAndSetIfChanged(ref _isHardwareBusy, value);
try
{
TrySetWalletStates();
}
catch (Exception ex)
{
Logger.LogInfo<LoadWalletViewModel>(ex);
}
}
}
public override void OnCategorySelected()
{
if (IsHardwareWallet)
{
return;
}
lock (WalletLock)
{
Wallets.Clear();
Password = "";
SetValidationMessage("");
var directoryInfo = new DirectoryInfo(Global.WalletsDir);
var walletFiles = directoryInfo.GetFiles("*.json", SearchOption.TopDirectoryOnly).OrderByDescending(t => t.LastAccessTimeUtc);
foreach (var file in walletFiles)
{
var wallet = new LoadWalletEntry(Path.GetFileNameWithoutExtension(file.FullName));
if (IsPasswordRequired)
{
if (KeyManager.TryGetEncryptedSecretFromFile(file.FullName, out _))
{
Wallets.Add(wallet);
}
}
else
{
Wallets.Add(wallet);
}
}
SelectedWallet = Wallets.FirstOrDefault();
TrySetWalletStates();
}
}
private bool TrySetWalletStates()
{
try
{
IsWalletSelected = SelectedWallet != null;
CanTestPassword = IsWalletSelected;
if (Global.WalletService is null)
{
IsWalletOpened = false;
// If not busy loading.
// And wallet is selected.
// And no wallet is opened.
CanLoadWallet = !IsBusy && IsWalletSelected;
}
else
{
IsWalletOpened = true;
CanLoadWallet = false;
SetWarningMessage("There is already an open wallet. Restart the application in order to open a different one.");
}
SetLoadButtonText();
return true;
}
catch (Exception ex)
{
Logger.LogWarning<LoadWalletViewModel>(ex);
}
return false;
}
public ReactiveCommand<Unit, Unit> LoadCommand { get; }
public ReactiveCommand<Unit, KeyManager> TestPasswordCommand { get; }
public ReactiveCommand<Unit, Unit> ImportColdcardCommand { get; set; }
public void TryRefreshHardwareWallets(IEnumerable<HardwareWalletInfo> hwis)
{
lock (WalletLock)
{
var changed = false;
var toRemove = new List<LoadWalletEntry>();
foreach (var hwi in hwis)
{
LoadWalletEntry found = Wallets?.FirstOrDefault(x => x.HardwareWalletInfo.Path == hwi.Path);
// If something changed then update.
if (found?.HardwareWalletInfo != null &&
(found.HardwareWalletInfo.Initialized != hwi.Initialized || found.HardwareWalletInfo.Ready != hwi.Ready || found.HardwareWalletInfo.MasterFingerprint != hwi.MasterFingerprint || found.HardwareWalletInfo.Error != hwi.Error))
{
toRemove.Add(found);
changed = true;
}
}
foreach (var wallet in Wallets)
{
if (hwis.All(x => x.Path != wallet.HardwareWalletInfo.Path)) // If it's not in the list anymore, then remove.
{
toRemove.Add(wallet);
changed = true;
}
}
foreach (var wallet in toRemove)
{
Wallets.Remove(wallet);
}
foreach (var hwi in hwis)
{
if (Wallets.All(x => x.HardwareWalletInfo.Path != hwi.Path)) // If it's not already in the list, then add.
{
Wallets.Add(new LoadWalletEntry(hwi));
changed = true;
}
}
if (changed)
{
TrySetWalletStates();
}
if (hwis.Any())
{
IsHwWalletSearchTextVisible = false;
SelectedWallet = Wallets.FirstOrDefault();
}
else
{
IsHwWalletSearchTextVisible = true;
}
}
}
public async Task<KeyManager> LoadKeyManagerAsync(bool requirePassword, bool isHardwareWallet)
{
try
{
SetValidationMessage("");
CanTestPassword = false;
var password = Guard.Correct(Password); // Do not let whitespaces to the beginning and to the end.
Password = ""; // Clear password field.
var selectedWallet = SelectedWallet;
if (selectedWallet is null)
{
SetValidationMessage("No wallet selected.");
return null;
}
var walletName = selectedWallet.WalletName;
if (isHardwareWallet)
{
if (selectedWallet.HardwareWalletInfo is null)
{
SetValidationMessage("No hardware wallets detected.");
return null;
}
if (!selectedWallet.HardwareWalletInfo.Initialized)
{
IEnumerable<HardwareWalletInfo> hwis;
try
{
IsHardwareBusy = true;
MainWindowViewModel.Instance.StatusBar.TryAddStatus(StatusBarStatus.SettingUpHardwareWallet);
if (!await HwiProcessManager.SetupAsync(selectedWallet.HardwareWalletInfo))
{
throw new Exception("Setup failed.");
}
MainWindowViewModel.Instance.StatusBar.TryAddStatus(StatusBarStatus.ConnectingToHardwareWallet);
hwis = await HwiProcessManager.EnumerateAsync();
}
finally
{
IsHardwareBusy = false;
MainWindowViewModel.Instance.StatusBar.TryRemoveStatus(StatusBarStatus.SettingUpHardwareWallet, StatusBarStatus.ConnectingToHardwareWallet);
}
TryRefreshHardwareWallets(hwis);
return await LoadKeyManagerAsync(requirePassword, isHardwareWallet);
}
else if (selectedWallet.HardwareWalletInfo.NeedPin)
{
if (!await HwiProcessManager.PromptPinAsync(selectedWallet.HardwareWalletInfo))
{
throw new IOException("promptpin request failed.");
}
PinPadViewModel pinpad = IoC.Get<IShell>().Documents.OfType<PinPadViewModel>().FirstOrDefault();
if (pinpad is null)
{
pinpad = new PinPadViewModel(Global);
IoC.Get<IShell>().AddOrSelectDocument(pinpad);
}
var result = await pinpad.ShowDialogAsync();
if (!(result is true))
{
SetValidationMessage("PIN was not provided.");
return null;
}
var maskedPin = pinpad.MaskedPin;
if (!await HwiProcessManager.SendPinAsync(selectedWallet.HardwareWalletInfo, maskedPin))
{
SetValidationMessage("Wrong PIN.");
return null;
}
var p = selectedWallet.HardwareWalletInfo.Path;
var t = selectedWallet.HardwareWalletInfo.Type;
var enumRes = await HwiProcessManager.EnumerateAsync();
TryRefreshHardwareWallets(enumRes);
selectedWallet = Wallets.FirstOrDefault(x => x.HardwareWalletInfo.Type == t && x.HardwareWalletInfo.Path == p);
if (selectedWallet is null)
{
SetValidationMessage("Could not find the hardware wallet you are working with. Did you disconnect it?");
return null;
}
else
{
SelectedWallet = selectedWallet;
}
if (!selectedWallet.HardwareWalletInfo.Initialized)
{
SetValidationMessage("Hardware wallet is not initialized.");
return null;
}
if (!selectedWallet.HardwareWalletInfo.Ready)
{
SetValidationMessage("Hardware wallet is not ready.");
return null;
}
if (selectedWallet.HardwareWalletInfo.NeedPin)
{
SetValidationMessage("Hardware wallet still needs a PIN.");
return null;
}
}
if (selectedWallet.HardwareWalletInfo.MasterFingerprint is null)
{
throw new InvalidOperationException("Hardware wallet did not provide a master fingerprint.");
}
ExtPubKey extPubKey;
try
{
MainWindowViewModel.Instance.StatusBar.TryAddStatus(StatusBarStatus.AcquiringXpubFromHardwareWallet);
extPubKey = await HwiProcessManager.GetXpubAsync(selectedWallet.HardwareWalletInfo);
}
finally
{
MainWindowViewModel.Instance.StatusBar.TryRemoveStatus(StatusBarStatus.AcquiringXpubFromHardwareWallet);
}
Logger.LogInfo<LoadWalletViewModel>("Hardware wallet was not used previously on this computer. Creating new wallet file.");
if (TryFindWalletByExtPubKey(extPubKey, out string wn))
{
walletName = wn;
}
else
{
walletName = Global.GetNextHardwareWalletName(selectedWallet.HardwareWalletInfo);
var path = Global.GetWalletFullPath(walletName);
KeyManager.CreateNewHardwareWalletWatchOnly(selectedWallet.HardwareWalletInfo.MasterFingerprint.Value, extPubKey, path);
}
}
var walletFullPath = Global.GetWalletFullPath(walletName);
var walletBackupFullPath = Global.GetWalletBackupFullPath(walletName);
if (!File.Exists(walletFullPath) && !File.Exists(walletBackupFullPath))
{
// The selected wallet is not available any more (someone deleted it?).
OnCategorySelected();
SetValidationMessage("The selected wallet and its backup do not exist, did you delete them?");
return null;
}
KeyManager keyManager = Global.LoadKeyManager(walletFullPath, walletBackupFullPath);
keyManager.HardwareWalletInfo = selectedWallet.HardwareWalletInfo;
// Only check requirepassword here, because the above checks are applicable to loadwallet, too and we are using this function from load wallet.
if (requirePassword)
{
if (keyManager.TestPassword(password))
{
SetSuccessMessage("Correct password.");
keyManager.SetPasswordVerified();
}
else
{
SetValidationMessage("Wrong password.");
return null;
}
}
else
{
if (keyManager.PasswordVerified == false)
{
Owner.SelectTestPassword();
return null;
}
}
return keyManager;
}
catch (Exception ex)
{
if (ex is IOException && ex.Message.Contains("promptpin", StringComparison.Ordinal))
{
// This happens for example when the PIN is cleared (timeout, disconnect) after the enumeration and the xpub was not yet acquired at all, so we reenumerate.
// This will still show up the error, but at least this'll make sure that the new hardware wallet state is shown in the GUI, so they can click Load again.
var enumRes = await HwiProcessManager.EnumerateAsync();
TryRefreshHardwareWallets(enumRes);
}
// Initialization failed.
SetValidationMessage(ex.ToTypeMessageString());
Logger.LogError<LoadWalletViewModel>(ex);
return null;
}
finally
{
CanTestPassword = IsWalletSelected;
}
}
private bool TryFindWalletByExtPubKey(ExtPubKey extPubKey, out string walletName)
{
// Start searching for the real wallet name.
walletName = null;
var walletFiles = new DirectoryInfo(Global.WalletsDir);
var walletBackupFiles = new DirectoryInfo(Global.WalletBackupsDir);
List<FileInfo> walletFileNames = new List<FileInfo>();
if (walletFiles.Exists)
{
walletFileNames.AddRange(walletFiles.EnumerateFiles());
}
if (walletBackupFiles.Exists)
{
walletFileNames.AddRange(walletFiles.EnumerateFiles());
}
walletFileNames = walletFileNames.OrderByDescending(x => x.LastAccessTimeUtc).ToList();
foreach (FileInfo walletFile in walletFileNames)
{
if (walletFile?.Extension?.Equals(".json", StringComparison.OrdinalIgnoreCase) is true
&& KeyManager.TryGetExtPubKeyFromFile(walletFile.FullName, out ExtPubKey epk))
{
if (epk == extPubKey) // We already had it.
{
walletName = walletFile.Name;
return true;
}
}
}
return false;
}
public async Task LoadWalletAsync()
{
try
{
IsBusy = true;
SetValidationMessage("");
MainWindowViewModel.Instance.StatusBar.TryAddStatus(StatusBarStatus.Loading);
var keyManager = await LoadKeyManagerAsync(IsPasswordRequired, IsHardwareWallet);
if (keyManager is null)
{
return;
}
try
{
await Task.Run(async () =>
{
await Global.InitializeWalletServiceAsync(keyManager);
});
// Successffully initialized.
Owner.OnClose();
// Open Wallet Explorer tabs
if (Global.WalletService.Coins.Any())
{
// If already have coins then open with History tab first.
IoC.Get<WalletExplorerViewModel>().OpenWallet(Global.WalletService, receiveDominant: false);
}
else // Else open with Receive tab first.
{
IoC.Get<WalletExplorerViewModel>().OpenWallet(Global.WalletService, receiveDominant: true);
}
}
catch (Exception ex)
{
// Initialization failed.
SetValidationMessage(ex.ToTypeMessageString());
if (!(ex is OperationCanceledException))
{
Logger.LogError<LoadWalletViewModel>(ex);
}
await Global.DisposeInWalletDependentServicesAsync();
}
}
finally
{
MainWindowViewModel.Instance.StatusBar.TryRemoveStatus(StatusBarStatus.Loading);
IsBusy = false;
}
}
public ReactiveCommand<Unit, Unit> OpenFolderCommand { get; }
public void OpenWalletsFolder()
{
var path = Global.WalletsDir;
IoHelpers.OpenFolderInFileExplorer(path);
}
}
}