Navmenu related to current authorized user's role

SchengenVisaApi/BlazorWebAssemblyVisaApiClient/Components/Auth/AuthComponent.razor

@@ -26,6 +26,7 @@
             var token = await Client.LoginAsync(authData.Email, authData.Password);
             Client.AuthToken = token;
             AuthData = authData;
+            UserDataProvider.UpdateCurrentRole();
 
             Status?.SetSuccess("Logged in successfully.");
         }

SchengenVisaApi/BlazorWebAssemblyVisaApiClient/Infrastructure/Services/UserDataProvider/IUserDataProvider.cs

@@ -4,9 +4,12 @@ namespace BlazorWebAssemblyVisaApiClient.Infrastructure.Services.UserDataProvide
 {
     public interface IUserDataProvider
     {
+        public string? CurrentRole { get; }
+
+        public Action? OnRoleChanged { get; set; }
 
         public Task<ApplicantModel> GetApplicant();
 
-        public string? GetCurrentRole();
+        public void UpdateCurrentRole();
     }
 }

SchengenVisaApi/BlazorWebAssemblyVisaApiClient/Infrastructure/Services/UserDataProvider/UserDataProvider.cs

@@ -9,16 +9,21 @@ namespace BlazorWebAssemblyVisaApiClient.Infrastructure.Services.UserDataProvide
     {
         private readonly static JwtSecurityTokenHandler tokenHandler = new();
 
+        public string? CurrentRole { get; private set; }
+
+        public Action? OnRoleChanged { get; set; }
+
         public async Task<ApplicantModel> GetApplicant()
         {
             return await client.GetApplicantAsync();
         }
 
-        public string? GetCurrentRole()
+        public void UpdateCurrentRole()
         {
             if (client.AuthToken is null)
             {
-                return null;
+                CurrentRole = null;
+                return;
             }
 
             var token = tokenHandler.ReadJwtToken(client.AuthToken.Token);
@@ -32,7 +37,11 @@ namespace BlazorWebAssemblyVisaApiClient.Infrastructure.Services.UserDataProvide
                 default: throw new UnknownRoleException();
             }
 
-            return role;
+            if (CurrentRole != role)
+            {
+                CurrentRole = role;
+                OnRoleChanged?.Invoke();
+            }
         }
     }
 }

SchengenVisaApi/BlazorWebAssemblyVisaApiClient/Layout/NavMenu.razor

@@ -1,4 +1,5 @@
-<div class="top-row ps-3 navbar navbar-dark">
+@using BlazorWebAssemblyVisaApiClient.Infrastructure.Services.UserDataProvider
+<div class="top-row ps-3 navbar navbar-dark">
     <div class="container-fluid">
         <a class="navbar-brand" href="">Schengen Visa</a>
         <button title="Navigation menu" class="navbar-toggler" @onclick="ToggleNavMenu">
@@ -15,13 +16,18 @@
             </NavLink>
         </div>
     </nav>
-    <nav class="flex-column">
-        <div class="nav-item px-3">
-            <NavLink class="nav-link" href="applications" Match="NavLinkMatch.All">
-                <span class="bi bi-list-nested-nav-menu" aria-hidden="true"></span> Applications
-            </NavLink>
-        </div>
-    </nav>
+    @if (UserDataProvider.CurrentRole is Constants.ApplicantRole or Constants.ApprovingAuthorityRole)
+    {
+        <nav class="flex-column">
+            <div class="nav-item px-3">
+                <NavLink class="nav-link" href="applications" Match="NavLinkMatch.All">
+                    <span class="bi bi-list-nested-nav-menu" aria-hidden="true"></span> Applications
+                </NavLink>
+            </div>
+        </nav>
+    }
+    @if(UserDataProvider.CurrentRole is Constants.ApplicantRole)
+    {
     <nav class="flex-column">
         <div class="nav-item px-3">
             <NavLink class="nav-link" href="applications/new" Match="NavLinkMatch.All">
@@ -29,13 +35,22 @@
             </NavLink>
         </div>
     </nav>
+    }
 </div>
 
 @code {
     private bool collapseNavMenu = true;
+    private string? currentRole = null!;
 
     private string? NavMenuCssClass => collapseNavMenu ? "collapse" : null;
 
+    [Inject] private IUserDataProvider UserDataProvider { get; set; } = null!;
+
+    protected override void OnInitialized()
+    {
+        UserDataProvider.OnRoleChanged += StateHasChanged;
+    }
+
     private void ToggleNavMenu()
     {
         collapseNavMenu = !collapseNavMenu;

SchengenVisaApi/BlazorWebAssemblyVisaApiClient/Pages/Application.razor

@@ -199,7 +199,7 @@
         try
         {
             var applicationId = Guid.Parse(ApplicationId);
-            currentRole = UserDataProvider.GetCurrentRole() ?? throw new NotLoggedInException();
+            currentRole = UserDataProvider.CurrentRole ?? throw new NotLoggedInException();
 
                 application = currentRole switch
                 {

SchengenVisaApi/BlazorWebAssemblyVisaApiClient/Pages/Applications.razor

@@ -60,7 +60,14 @@
 
     protected override async Task OnInitializedAsync()
     {
-        currentRole = UserDataProvider.GetCurrentRole()!;
+        try
+        {
+            currentRole = UserDataProvider.CurrentRole ?? throw new NotLoggedInException();
+        }
+        catch (Exception e)
+        {
+            ErrorHandler.Handle(e);
+        }
         await Fetch();
     }
 

SchengenVisaApi/BlazorWebAssemblyVisaApiClient/Pages/CreateApplication.razor

@@ -178,7 +178,7 @@
 
         @if (isNonResident)
         {
-            requestModel.ReentryPermit = NewReentryPermit();
+            requestModel.ReentryPermit ??= NewReentryPermit();
             <div class="form-block">
                 <h5>Re-entry permission@(Constants.RequiredFieldMarkup)</h5>
                 <ReentryPermitInput ReentryPermit="requestModel.ReentryPermit"/>