manage conflict (generic way) use toast to show error (#588)

* manage conflict (generic way) use toast to show error

* fix httpservice after merge conflict, adapt to use new repository

src/ApplicationCore/Exceptions/DuplicateCatalogItemNameException.cs

@@ -1,14 +0,0 @@
-using System;
-
-namespace Microsoft.eShopWeb.ApplicationCore.Exceptions
-{
-    public class DuplicateCatalogItemNameException : Exception
-    {
-        public DuplicateCatalogItemNameException(string message, int duplicateItemId) : base(message)
-        {
-            DuplicateItemId = duplicateItemId;
-        }
-
-        public int DuplicateItemId { get; }
-    }
-}

src/ApplicationCore/Exceptions/DuplicateException.cs

@@ -0,0 +1,14 @@
+using System;
+
+namespace Microsoft.eShopWeb.ApplicationCore.Exceptions
+{
+
+    public class DuplicateException : Exception
+    {
+        public DuplicateException(string message) : base(message)
+        {
+            
+        }
+       
+    }
+}

src/ApplicationCore/Specifications/CatalogItemNameSpecification.cs

@@ -0,0 +1,13 @@
+using Ardalis.Specification;
+using Microsoft.eShopWeb.ApplicationCore.Entities;
+
+namespace Microsoft.eShopWeb.ApplicationCore.Specifications
+{
+    public class CatalogItemNameSpecification : Specification<CatalogItem>
+    {
+        public CatalogItemNameSpecification(string catalogItemName)
+        {
+            Query.Where(item => string.Compare(catalogItemName, item.Name, true) == 0);
+        }
+    }
+}

src/BlazorAdmin/Helpers/ToastComponent.cs

@@ -0,0 +1,88 @@
+using BlazorAdmin.Services;
+using Microsoft.AspNetCore.Components;
+using System;
+
+namespace BlazorAdmin.Helpers
+{
+    public class ToastComponent : ComponentBase, IDisposable
+    {
+        [Inject]
+        ToastService ToastService
+        {
+            get;
+            set;
+        }
+        protected string Heading
+        {
+            get;
+            set;
+        }
+        protected string Message
+        {
+            get;
+            set;
+        }
+        protected bool IsVisible
+        {
+            get;
+            set;
+        }
+        protected string BackgroundCssClass
+        {
+            get;
+            set;
+        }
+        protected string IconCssClass
+        {
+            get;
+            set;
+        }
+        protected override void OnInitialized()
+        {
+            ToastService.OnShow += ShowToast;
+            ToastService.OnHide += HideToast;
+        }
+        private void ShowToast(string message, ToastLevel level)
+        {
+            BuildToastSettings(level, message);
+            IsVisible = true;
+            StateHasChanged();
+        }
+        private void HideToast()
+        {
+            IsVisible = false;
+            StateHasChanged();
+        }
+        private void BuildToastSettings(ToastLevel level, string message)
+        {
+            switch (level)
+            {
+                case ToastLevel.Info:
+                    BackgroundCssClass = "bg-info";
+                    IconCssClass = "info";
+                    Heading = "Info";
+                    break;
+                case ToastLevel.Success:
+                    BackgroundCssClass = "bg-success";
+                    IconCssClass = "check";
+                    Heading = "Success";
+                    break;
+                case ToastLevel.Warning:
+                    BackgroundCssClass = "bg-warning";
+                    IconCssClass = "exclamation";
+                    Heading = "Warning";
+                    break;
+                case ToastLevel.Error:
+                    BackgroundCssClass = "bg-danger";
+                    IconCssClass = "times";
+                    Heading = "Error";
+                    break;
+            }
+            Message = message;
+        }
+        public void Dispose()
+        {
+            ToastService.OnShow -= ShowToast;
+        }
+    }
+}

src/BlazorAdmin/Pages/CatalogItemPage/Create.razor

@@ -106,13 +106,13 @@
 
 @code {
 
-    [Parameter]
-    public IEnumerable<CatalogBrand> Brands { get; set; }
-    [Parameter]
-    public IEnumerable<CatalogType> Types { get; set; }
+        [Parameter]
+        public IEnumerable<CatalogBrand> Brands { get; set; }
+        [Parameter]
+        public IEnumerable<CatalogType> Types { get; set; }
 
-    [Parameter]
-    public EventCallback<string> OnSaveClick { get; set; }
+        [Parameter]
+        public EventCallback<string> OnSaveClick { get; set; }
 
     private string LoadPicture => string.IsNullOrEmpty(_item.PictureBase64) ? string.Empty : $"data:image/png;base64, {_item.PictureBase64}";
     private bool HasPicture => !string.IsNullOrEmpty(_item.PictureBase64);
@@ -124,13 +124,17 @@
 
     private async Task CreateClick()
     {
-        await CatalogItemService.Create(_item);
-        await OnSaveClick.InvokeAsync(null);
-        await Close();
+        var result = await CatalogItemService.Create(_item);
+        if (result != null)
+        {
+            await OnSaveClick.InvokeAsync(null);
+            await Close();
+        }
     }
 
     public async Task Open()
     {
+    
         Logger.LogInformation("Now loading... /Catalog/Create");
 
         await new Css(JSRuntime).HideBodyOverflow();

src/BlazorAdmin/Program.cs

@@ -25,8 +25,10 @@ namespace BlazorAdmin
 
             builder.Services.AddScoped(sp => new HttpClient() { BaseAddress = new Uri(builder.HostEnvironment.BaseAddress) });
 
+            builder.Services.AddScoped<ToastService>();
             builder.Services.AddScoped<HttpService>();
            
+
             builder.Services.AddScoped<ILocalStorageService, LocalStorageService>();
 
             builder.Services.AddAuthorizationCore();

src/BlazorAdmin/Services/CatalogItemService.cs

@@ -33,7 +33,8 @@ namespace BlazorAdmin.Services
 
         public async Task<CatalogItem> Create(CreateCatalogItemRequest catalogItem)
         {
-            return (await _httpService.HttpPost<CreateCatalogItemResponse>("catalog-items", catalogItem)).CatalogItem;
+            var response = await _httpService.HttpPost<CreateCatalogItemResponse>("catalog-items", catalogItem);
+            return response?.CatalogItem;
         }
 
         public async Task<CatalogItem> Edit(CatalogItem catalogItem)

src/BlazorAdmin/Services/HttpService.cs

@@ -1,4 +1,5 @@
 using BlazorShared;
+using BlazorShared.Models;
 using System.Net.Http;
 using System.Text;
 using System.Text.Json;
@@ -9,11 +10,14 @@ namespace BlazorAdmin.Services
     public class HttpService
     {
         private readonly HttpClient _httpClient;
+        private readonly ToastService _toastService;
         private readonly string _apiUrl;
 
-        public HttpService(HttpClient httpClient, BaseUrlConfiguration baseUrlConfiguration)
+
+        public HttpService(HttpClient httpClient, BaseUrlConfiguration baseUrlConfiguration, ToastService toastService)
         {
             _httpClient = httpClient;
+            _toastService = toastService;
             _apiUrl = baseUrlConfiguration.ApiBase;
         }
 
@@ -49,6 +53,12 @@ namespace BlazorAdmin.Services
             var result = await _httpClient.PostAsync($"{_apiUrl}{uri}", content);
             if (!result.IsSuccessStatusCode)
             {
+                var exception = JsonSerializer.Deserialize<ErrorDetails>(await result.Content.ReadAsStringAsync(), new JsonSerializerOptions
+                {
+                    PropertyNameCaseInsensitive = true
+                });
+                _toastService.ShowToast($"Error : {exception.Message}", ToastLevel.Error);
+
                 return null;
             }
 
@@ -63,13 +73,13 @@ namespace BlazorAdmin.Services
             var result = await _httpClient.PutAsync($"{_apiUrl}{uri}", content);
             if (!result.IsSuccessStatusCode)
             {
+                _toastService.ShowToast("Error", ToastLevel.Error);
                 return null;
             }
 
             return await FromHttpResponseMessage<T>(result);
         }
 
-
         private StringContent ToJson(object obj)
         {
             return new StringContent(JsonSerializer.Serialize(obj), Encoding.UTF8, "application/json");

src/BlazorAdmin/Services/ToastService.cs

@@ -0,0 +1,55 @@
+using System;
+using System.Timers;
+
+namespace BlazorAdmin.Services
+{
+    public enum ToastLevel
+    {
+        Info,
+        Success,
+        Warning,
+        Error
+    }
+
+    public class ToastService : IDisposable
+    {
+        public event Action<string, ToastLevel> OnShow;
+        public event Action OnHide;
+        private Timer Countdown;
+        public void ShowToast(string message, ToastLevel level)
+        {
+            OnShow?.Invoke(message, level);
+            StartCountdown();
+        }
+        private void StartCountdown()
+        {
+            SetCountdown();
+            if (Countdown.Enabled)
+            {
+                Countdown.Stop();
+                Countdown.Start();
+            }
+            else
+            {
+                Countdown.Start();
+            }
+        }
+        private void SetCountdown()
+        {
+            if (Countdown == null)
+            {
+                Countdown = new Timer(3000);
+                Countdown.Elapsed += HideToast;
+                Countdown.AutoReset = false;
+            }
+        }
+        private void HideToast(object source, ElapsedEventArgs args)
+        {
+            OnHide?.Invoke();
+        }
+        public void Dispose()
+        {
+            Countdown?.Dispose();
+        }
+    }
+}

src/BlazorAdmin/Shared/MainLayout.razor

@@ -3,6 +3,7 @@
 
 @inherits BlazorAdmin.Helpers.BlazorLayoutComponent
 
+
 <AuthorizeView Roles=@BlazorShared.Authorization.Constants.Roles.ADMINISTRATORS>
     <div class="sidebar">
         <NavMenu />
@@ -10,11 +11,13 @@
 </AuthorizeView>
 
 <div class="main">
+   
     <div class="top-row px-4">
         <a href="https://github.com/dotnet-architecture/eShopOnWeb" target="_blank" class="ml-md-auto">About eShopOnWeb</a>
     </div>
 
     <div class="content px-4">
+        <Toast></Toast>
         @Body
     </div>
 </div>

src/BlazorAdmin/Shared/Toast.razor

@@ -0,0 +1,13 @@
+@inherits BlazorAdmin.Helpers.ToastComponent
+
+@namespace BlazorAdmin.Shared
+
+<div class="toast @(IsVisible ? "toast-visible" : null) @BackgroundCssClass">
+    <div class="toast-icon">
+        <i class="fa fa-@IconCssClass" aria-hidden="true"></i>
+    </div>
+    <div class="toast-body">
+        <h5>@Heading</h5>
+        <p>@Message</p>
+    </div>
+</div>

src/BlazorAdmin/wwwroot/css/admin.css

@@ -153,6 +153,53 @@ a, .btn-link {
     overflow: hidden !important;
 }
 
+.toast {
+    display: none;
+    padding: 1.5rem;
+    color: #fff;
+    z-index: 99999;
+    position: absolute;
+    width: 25rem;
+    top: 2rem;
+    border-radius: 1rem;
+    left: 50%;
+}
+
+.toast-icon {
+    display: flex;
+    flex-direction: column;
+    justify-content: center;
+    padding: 01rem;
+    font-size: 2.5rem;
+}
+
+.toast-body {
+    display: flex;
+    flex-direction: column;
+    flex: 1;
+    padding-left: 1rem;
+}
+
+.toast-body p {
+    margin-bottom: 0;
+}
+
+.toast-visible {
+    display: flex;
+    flex-direction: row;
+    animation: fadein 1.5s;
+}
+
+@keyframes fadein {
+    from {
+        opacity: 0;
+    }
+
+    to {
+        opacity: 1;
+    }
+}
+
 @media (max-width: 767.98px) {
     .main .top-row:not(.auth) {
         display: none;

src/BlazorShared/Models/ErrorDetails.cs

@@ -0,0 +1,14 @@
+using System.Text.Json;
+
+namespace BlazorShared.Models
+{
+    public class ErrorDetails
+    {
+        public int StatusCode { get; set; }
+        public string Message { get; set; }
+        public override string ToString()
+        {
+            return JsonSerializer.Serialize(this);
+        }
+    }
+}

src/PublicApi/CatalogItemEndpoints/Create.cs

@@ -3,9 +3,10 @@ using Microsoft.AspNetCore.Authentication.JwtBearer;
 using Microsoft.AspNetCore.Authorization;
 using Microsoft.AspNetCore.Mvc;
 using Microsoft.eShopWeb.ApplicationCore.Entities;
+using Microsoft.eShopWeb.ApplicationCore.Exceptions;
 using Microsoft.eShopWeb.ApplicationCore.Interfaces;
+using Microsoft.eShopWeb.ApplicationCore.Specifications;
 using Swashbuckle.AspNetCore.Annotations;
-using System.IO;
 using System.Threading;
 using System.Threading.Tasks;
 
@@ -38,8 +39,14 @@ namespace Microsoft.eShopWeb.PublicApi.CatalogItemEndpoints
         {
             var response = new CreateCatalogItemResponse(request.CorrelationId());
 
-            var newItem = new CatalogItem(request.CatalogTypeId, request.CatalogBrandId, request.Description, request.Name, request.Price, request.PictureUri);
+            var catalogItemNameSpecification = new CatalogItemNameSpecification(request.Name);
+            var existingCataloogItem = await _itemRepository.CountAsync(catalogItemNameSpecification, cancellationToken);
+            if (existingCataloogItem > 0)
+            {
+                throw new DuplicateException($"A catalogItem with name {request.Name} already exists");
+            }
 
+            var newItem = new CatalogItem(request.CatalogTypeId, request.CatalogBrandId, request.Description, request.Name, request.Price, request.PictureUri);
             newItem = await _itemRepository.AddAsync(newItem, cancellationToken);
 
             if (newItem.Id != 0)

src/PublicApi/MiddleWares/ExceptionMiddleware.cs

@@ -0,0 +1,46 @@
+using BlazorShared.Models;
+using Microsoft.AspNetCore.Http;
+using Microsoft.eShopWeb.ApplicationCore.Exceptions;
+using System;
+using System.Net;
+using System.Threading.Tasks;
+
+namespace Microsoft.eShopWeb.PublicApi.MiddleWares
+{
+    public class ExceptionMiddleware
+    {
+        private readonly RequestDelegate _next;
+
+        public ExceptionMiddleware(RequestDelegate next)
+        {
+            _next = next;
+        }
+
+        public async Task InvokeAsync(HttpContext httpContext)
+        {
+            try
+            {
+                await _next(httpContext);
+            }
+            catch (Exception ex)
+            {
+                await HandleExceptionAsync(httpContext, ex);
+            }
+        }
+
+        private async Task HandleExceptionAsync(HttpContext context, Exception exception)
+        {
+            context.Response.ContentType = "application/json";
+
+            if (exception is DuplicateException duplicationException)
+            {
+                context.Response.StatusCode = (int)HttpStatusCode.Conflict;
+                await context.Response.WriteAsync(new ErrorDetails()
+                {
+                    StatusCode = context.Response.StatusCode,
+                    Message = duplicationException.Message
+                }.ToString());
+            }
+        }
+    }
+}

src/PublicApi/Startup.cs

@@ -14,6 +14,7 @@ using Microsoft.eShopWeb.Infrastructure.Data;
 using Microsoft.eShopWeb.Infrastructure.Identity;
 using Microsoft.eShopWeb.Infrastructure.Logging;
 using Microsoft.eShopWeb.Infrastructure.Services;
+using Microsoft.eShopWeb.PublicApi.MiddleWares;
 using Microsoft.Extensions.Configuration;
 using Microsoft.Extensions.DependencyInjection;
 using Microsoft.Extensions.Hosting;
@@ -178,6 +179,8 @@ namespace Microsoft.eShopWeb.PublicApi
                 app.UseDeveloperExceptionPage();
             }
 
+            app.UseMiddleware<ExceptionMiddleware>();
+
             app.UseHttpsRedirection();
 
             app.UseRouting();

src/Web/Startup.cs

@@ -158,6 +158,8 @@ namespace Microsoft.eShopWeb.Web
             services.AddBlazoredLocalStorage();
             services.AddServerSideBlazor();
 
+
+            services.AddScoped<ToastService>();
             services.AddScoped<HttpService>();
             services.AddBlazorServices();