Chnage password

src/SafeMessageStorage/SafeMessageStorage/SafeMessageStorage/Pages/AuthorizationPage.xaml

@@ -14,7 +14,7 @@
             <Label x:Name="ErrorMessageLabel"
                    TextColor="#d22"
                    Margin="0,10" HorizontalOptions="Center"/>
-            <Button Text="AuthorizeAsync" Command="{Binding AuthorizeCommand}"/>
+            <Button Text="Authorize" Command="{Binding AuthorizeCommand}"/>
         </StackLayout>
     </ContentPage.Content>
 </ContentPage>

src/SafeMessageStorage/SafeMessageStorage/SafeMessageStorage/Pages/AuthorizationPage.xaml.cs

@@ -41,7 +41,7 @@ namespace SafeMessageStorage.Pages
 
         private async void _viewModel_AuthorizationSucceeded(object sender, EventArgs e)
         {
-            await Navigation.PushAsync(new MessagesListPage(_messageStorage));
+            await Navigation.PushAsync(new MessagesListPage(_messageStorage, _authorizationService));
         }
 
         private async void _viewModel_AuthorizationFailed(object sender, string e)

src/SafeMessageStorage/SafeMessageStorage/SafeMessageStorage/Pages/ChangePasswordPage.xaml

@@ -0,0 +1,23 @@
+<?xml version="1.0" encoding="utf-8" ?>
+<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
+             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
+             xmlns:d="http://xamarin.com/schemas/2014/forms/design"
+             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+             mc:Ignorable="d"
+             x:Class="SafeMessageStorage.Pages.ChangePasswordPage"
+             Title="Change password">
+    <ContentPage.Content>
+        <StackLayout VerticalOptions="CenterAndExpand" Padding="40">
+            <Label Text="Current password"/>
+            <Entry IsPassword="True" Text="{Binding CurrentPassword}"/>
+            <Label Text="New password"/>
+            <Entry IsPassword="True" Text="{Binding NewPassword}"/>
+            <Label Text="Repeat password"/>
+            <Entry IsPassword="True" Text="{Binding RepeatPassword}"/>
+            <Label x:Name="ErrorMessageLabel"
+                   TextColor="#d22"
+                   Margin="0,10" HorizontalOptions="Center"/>
+            <Button Text="Set password" Command="{Binding SetPasswordCommand}"/>
+        </StackLayout>
+    </ContentPage.Content>
+</ContentPage>

src/SafeMessageStorage/SafeMessageStorage/SafeMessageStorage/Pages/ChangePasswordPage.xaml.cs

@@ -0,0 +1,44 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using SafeMessageStorage.Services.AuthorizationService;
+using SafeMessageStorage.Services.MessageStorageService;
+using SafeMessageStorage.ViewModels;
+using Xamarin.Forms;
+using Xamarin.Forms.Xaml;
+
+namespace SafeMessageStorage.Pages
+{
+    [XamlCompilation(XamlCompilationOptions.Compile)]
+    public partial class ChangePasswordPage : ContentPage
+    {
+        private ChangePasswordViewModel _viewModel => this.BindingContext as ChangePasswordViewModel;
+        private IMessageStorageService _messageStorage;
+        public ChangePasswordPage(IAuthorizationService authorizationService, IMessageStorageService messageStorage)
+        {
+            InitializeComponent();
+            BindingContext = new ChangePasswordViewModel(authorizationService);
+            _messageStorage = messageStorage;
+
+            _viewModel.PasswordSetFailed += _viewModel_PasswordSetFailed;
+            _viewModel.PasswordSetSucceeded += _viewModel_PasswordSetSucceeded;
+
+        }
+
+        private async void _viewModel_PasswordSetSucceeded(object sender, EventArgs e)
+        {
+            await _messageStorage.DeleteAllMessagesAsync();
+            await Navigation.PopAsync();
+        }
+
+        private async void _viewModel_PasswordSetFailed(object sender, string e)
+        {
+            ErrorMessageLabel.Text = e;
+            await ErrorMessageLabel.FadeTo(1);
+            await Task.Delay(1000);
+            await ErrorMessageLabel.FadeTo(0);
+        }
+    }
+}

src/SafeMessageStorage/SafeMessageStorage/SafeMessageStorage/Pages/MessagesListPage.xaml

@@ -17,24 +17,6 @@
                   <TextCell Text="{Binding Title}" />
               </DataTemplate>
           </ListView.ItemTemplate>
-
-          <!--Custom View Cells-->
-          <!--
-    <ListView.ItemTemplate>
-      <DataTemplate>
-        <ViewCell>
-          <StackLayout>
-            <Label Text="{Binding Text}" 
-                   d:Text="{Binding .}"
-                   Style="{DynamicResource ListItemTextStyle}" />
-            <Label Text="{Binding Detail}" 
-                   d:Text="Detail"
-                   Style="{DynamicResource ListItemDetailTextStyle}"/>
-          </StackLayout>
-        </ViewCell>
-      </DataTemplate>
-    </ListView.ItemTemplate>
-    -->
       </ListView>
       <Button Text="AddMessage" Clicked="Button_OnClicked"></Button>
     </StackLayout>

src/SafeMessageStorage/SafeMessageStorage/SafeMessageStorage/Pages/MessagesListPage.xaml.cs

@@ -4,6 +4,7 @@ using System.ComponentModel;
 using System.Linq;
 using System.Threading.Tasks;
 using SafeMessageStorage.Models;
+using SafeMessageStorage.Services.AuthorizationService;
 using SafeMessageStorage.Services.MessageStorageService;
 using Xamarin.Forms;
 using Xamarin.Forms.Xaml;
@@ -14,16 +15,25 @@ namespace SafeMessageStorage.Pages
     public partial class MessagesListPage : ContentPage
     {
         private IMessageStorageService _messageStorage;
+        private IAuthorizationService _authorizationService;
         private bool _initialized;
         public ObservableCollection<Message> Messages { get; set; }
         
-        public MessagesListPage(IMessageStorageService messageStorage)
+        public MessagesListPage(IMessageStorageService messageStorage, IAuthorizationService authorizationService)
         {
             InitializeComponent();
             _messageStorage = messageStorage;
+            _authorizationService = authorizationService;
             Messages = new ObservableCollection<Message>();
 
             BindingContext = this;
+
+            ToolbarItems.Add(new ToolbarItem("Change password", "",  () => ChangePassword()));
+        }
+
+        private async void ChangePassword()
+        {
+            await Navigation.PushAsync(new ChangePasswordPage(_authorizationService, _messageStorage));
         }
 
         protected override async void OnAppearing()

src/SafeMessageStorage/SafeMessageStorage/SafeMessageStorage/SafeMessageStorage.csproj

@@ -22,6 +22,9 @@
     <EmbeddedResource Update="Pages\AuthorizationPage.xaml">
       <Generator>MSBuild:UpdateDesignTimeXaml</Generator>
     </EmbeddedResource>
+    <EmbeddedResource Update="Pages\ChangePasswordPage.xaml">
+      <Generator>MSBuild:UpdateDesignTimeXaml</Generator>
+    </EmbeddedResource>
     <EmbeddedResource Update="Pages\MessageDetailPage.xaml">
       <Generator>MSBuild:UpdateDesignTimeXaml</Generator>
     </EmbeddedResource>

src/SafeMessageStorage/SafeMessageStorage/SafeMessageStorage/Services/AuthorizationService/AuthorizationService.cs

@@ -49,7 +49,9 @@ namespace SafeMessageStorage.Services.AuthorizationService
             if (!passwordMatch)
                 return false;
 
-            await Xamarin.Essentials.SecureStorage.SetAsync(_passwordKey, _hashProvider.GetHashString(newPassword));
+            var passwordHash = _hashProvider.GetHashString(newPassword);
+            AuthorizedUserHash = passwordHash;
+            await Xamarin.Essentials.SecureStorage.SetAsync(_passwordKey, passwordHash);
             return true;
         }
     }

src/SafeMessageStorage/SafeMessageStorage/SafeMessageStorage/ViewModels/ChangePasswordViewModel.cs

@@ -0,0 +1,62 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+using System.Windows.Input;
+using SafeMessageStorage.Services.AuthorizationService;
+using Xamarin.Forms;
+
+namespace SafeMessageStorage.ViewModels
+{
+    public class ChangePasswordViewModel : ViewModelBase
+    {
+        private IAuthorizationService _authorizationService;
+
+        public ChangePasswordViewModel(IAuthorizationService authorizationService)
+        {
+            _authorizationService = authorizationService;
+        }
+
+        private string _currentPassword;
+        public string CurrentPassword
+        {
+            get { return _currentPassword; }
+            set { _currentPassword = value; OnPropertyChanged(); }
+        }
+
+
+        private string _newPassword;
+        public string NewPassword
+        {
+            get { return _newPassword; }
+            set { _newPassword = value; OnPropertyChanged(); }
+        }
+
+        private string _repeatPassword;
+        public string RepeatPassword
+        {
+            get { return _repeatPassword; }
+            set { _repeatPassword = value; OnPropertyChanged(); }
+        }
+
+        public event EventHandler<string> PasswordSetFailed;
+        public event EventHandler PasswordSetSucceeded;
+
+        public ICommand SetPasswordCommand => new Command(() => SetPassword(_currentPassword,_newPassword, _repeatPassword));
+
+        private async void SetPassword(string currentPassword, string password, string repeatPassword)
+        {
+            if(!await _authorizationService.AuthorizeAsync(currentPassword))
+                PasswordSetFailed?.Invoke(this, "Current password doesn't match");
+
+            if (!password.Equals(repeatPassword))
+            {
+                PasswordSetFailed?.Invoke(this, "Passwords are not equal");
+            }
+            else
+            {
+                if (await _authorizationService.ChangePasswordAsync(currentPassword, password))
+                    PasswordSetSucceeded?.Invoke(this, EventArgs.Empty);
+            }
+        }
+    }
+}