Lock by master password page.

src/App/Pages/Lock/LockPasswordPage.cs

@@ -0,0 +1,116 @@
+using System;
+using System.Threading.Tasks;
+using Acr.UserDialogs;
+using Bit.App.Abstractions;
+using Bit.App.Resources;
+using Xamarin.Forms;
+using XLabs.Ioc;
+using Plugin.Settings.Abstractions;
+using Bit.App.Models.Page;
+using Bit.App.Controls;
+using System.Linq;
+
+namespace Bit.App.Pages
+{
+    public class LockPasswordPage : ExtendedContentPage
+    {
+        private readonly IAuthService _authService;
+        private readonly IUserDialogs _userDialogs;
+        private readonly ISettings _settings;
+        private readonly ICryptoService _cryptoService;
+
+        public LockPasswordPage()
+            : base(false)
+        {
+            _authService = Resolver.Resolve<IAuthService>();
+            _userDialogs = Resolver.Resolve<IUserDialogs>();
+            _settings = Resolver.Resolve<ISettings>();
+            _cryptoService = Resolver.Resolve<ICryptoService>();
+
+            Init();
+        }
+
+        public Entry Password { get; private set; }
+
+        public void Init()
+        {
+            Password = new ExtendedEntry
+            {
+                HasBorder = false,
+                IsPassword = true,
+                Placeholder = AppResources.MasterPassword,
+                ReturnType = Enums.ReturnType.Go
+            };
+
+            var logoutButton = new Button
+            {
+                Text = AppResources.LogOut,
+                Command = new Command(async () => await LogoutAsync()),
+                VerticalOptions = LayoutOptions.End,
+                Style = (Style)Application.Current.Resources["btn-primaryAccent"]
+            };
+
+            var stackLayout = new StackLayout
+            {
+                Padding = new Thickness(30, 40),
+                Spacing = 10,
+                Children = { Password, logoutButton }
+            };
+
+            var loginToolbarItem = new ToolbarItem("Submit", null, async () =>
+            {
+                await CheckPasswordAsync();
+            }, ToolbarItemOrder.Default, 0);
+
+            ToolbarItems.Add(loginToolbarItem);
+            Title = "Verify Master Password";
+            Content = stackLayout;
+        }
+
+        protected override bool OnBackButtonPressed()
+        {
+            return false;
+        }
+
+        protected override void OnAppearing()
+        {
+            base.OnAppearing();
+            Password.Focus();
+        }
+
+        protected async Task CheckPasswordAsync()
+        {
+            if(string.IsNullOrWhiteSpace(Password.Text))
+            {
+                await DisplayAlert(AppResources.AnErrorHasOccurred, string.Format(AppResources.ValidationFieldRequired, AppResources.MasterPassword), AppResources.Ok);
+                return;
+            }
+
+            var key = _cryptoService.MakeKeyFromPassword(Password.Text, _authService.Email);
+            if(key.SequenceEqual(_cryptoService.Key))
+            {
+                await Navigation.PopModalAsync();
+            }
+            else
+            {
+                // TODO: keep track of invalid attempts and logout?
+
+                _userDialogs.Alert("Invalid Master Password. Try again.");
+                Password.Text = string.Empty;
+                Password.Focus();
+            }
+        }
+
+        private async Task LogoutAsync()
+        {
+            if(!await _userDialogs.ConfirmAsync("Are you sure you want to log out?", null, AppResources.Yes, AppResources.Cancel))
+            {
+                return;
+            }
+
+            _authService.LogOut();
+            await Navigation.PopModalAsync();
+            Application.Current.MainPage = new HomePage();
+        }
+    }
+}