initial commit

App.razor

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+<CascadingAuthenticationState>
+    <Router AppAssembly="typeof(Program).Assembly">
+        <NotFoundContent>
+            <p>Sorry, there's nothing at this address.</p>
+        </NotFoundContent>
+    </Router>
+</CascadingAuthenticationState>

BlazorAuth.csproj

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+<Project Sdk="Microsoft.NET.Sdk.Web">
+
+  <PropertyGroup>
+    <TargetFramework>netstandard2.0</TargetFramework>
+    <LangVersion>7.3</LangVersion>
+    <RazorLangVersion>3.0</RazorLangVersion>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.AspNetCore.Blazor" Version="3.0.0-preview6.19307.2" />
+    <PackageReference Include="Microsoft.AspNetCore.Blazor.Build" Version="3.0.0-preview6.19307.2" PrivateAssets="all" />
+    <PackageReference Include="Microsoft.AspNetCore.Blazor.DevServer" Version="3.0.0-preview6.19307.2" PrivateAssets="all" />
+  </ItemGroup>
+
+</Project>

Pages/Counter.razor

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+@page "/counter"
+
+<h1>Counter</h1>
+
+<p>Current count: @currentCount</p>
+
+<button class="btn btn-primary" @onclick="@IncrementCount">Click me</button>
+
+@code {
+    int currentCount = 0;
+
+    void IncrementCount()
+    {
+        currentCount++;
+    }
+}

Pages/FetchData.razor

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+@page "/fetchdata"
+@inject HttpClient Http
+
+<h1>Weather forecast</h1>
+
+<p>This component demonstrates fetching data from the server.</p>
+
+@if (forecasts == null)
+{
+    <p><em>Loading...</em></p>
+}
+else
+{
+    <table class="table">
+        <thead>
+            <tr>
+                <th>Date</th>
+                <th>Temp. (C)</th>
+                <th>Temp. (F)</th>
+                <th>Summary</th>
+            </tr>
+        </thead>
+        <tbody>
+            @foreach (var forecast in forecasts)
+            {
+                <tr>
+                    <td>@forecast.Date.ToShortDateString()</td>
+                    <td>@forecast.TemperatureC</td>
+                    <td>@forecast.TemperatureF</td>
+                    <td>@forecast.Summary</td>
+                </tr>
+            }
+        </tbody>
+    </table>
+}
+
+@code {
+    WeatherForecast[] forecasts;
+
+    protected override async Task OnInitAsync()
+    {
+        forecasts = await Http.GetJsonAsync<WeatherForecast[]>("sample-data/weather.json");
+    }
+
+    class WeatherForecast
+    {
+        public DateTime Date { get; set; }
+
+        public int TemperatureC { get; set; }
+
+        public int TemperatureF { get; set; }
+
+        public string Summary { get; set; }
+    }
+}

Pages/Index.razor

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+@page "/"
+@using Services.Auth
+@inject CustomAuthStateProvider CustomAuthStateProvider
+<h1>Hello, world!</h1>
+
+Welcome to your new app.
+
+<SurveyPrompt Title="How is Blazor working for you?" />
+
+ <Microsoft.AspNetCore.Components.AuthorizeView>
+    <NotAuthorized>
+        Not Authorized
+    </NotAuthorized>
+    <Authorizing>
+        Authorizing
+    </Authorizing>
+    <Authorized>
+        Authorized
+        @context.User.Identity.Name
+    </Authorized>
+</Microsoft.AspNetCore.Components.AuthorizeView>
+<button onclick="@(() => UpdateAuthentication(true))">
+    Set Auth True
+</button>
+<button onclick="@(() => UpdateAuthentication(false))">
+    Set Auth False
+</button>
+
+@code 
+{
+    [CascadingParameter]
+    private Task<AuthenticationState> AuthenticationStateTask { get; set; }
+
+    private async Task UpdateAuthentication(bool isAuthenticated)
+    {
+       CustomAuthStateProvider.Authenticated = isAuthenticated;
+       CustomAuthStateProvider.NotifyStateChange();
+    }
+}

Pages/_Imports.razor

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+@layout MainLayout

Program.cs

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+using Microsoft.AspNetCore.Blazor.Hosting;
+
+namespace BlazorAuth
+{
+    public class Program
+    {
+        public static void Main(string[] args)
+        {
+            CreateHostBuilder(args).Build().Run();
+        }
+
+        public static IWebAssemblyHostBuilder CreateHostBuilder(string[] args) =>
+            BlazorWebAssemblyHost.CreateDefaultBuilder()
+                .UseBlazorStartup<Startup>();
+    }
+}

Services/Auth/CustomAuthStateProvider.cs

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+using System;
+using System.Collections.Generic;
+using System.Security.Claims;
+using System.Threading.Tasks;
+using Microsoft.AspNetCore.Components;
+
+namespace BlazorAuth.Services.Auth
+{
+    public class CustomAuthStateProvider : AuthenticationStateProvider
+    {
+        public static bool Authenticated { get; set ;} = true;
+        public override async Task<AuthenticationState> GetAuthenticationStateAsync()
+        {
+            var claimsIdentity = Authenticated ? new ClaimsIdentity(new List<Claim>
+            {
+                new Claim(ClaimTypes.Name, "test_user")
+            }, "server_auth")
+            :
+            new ClaimsIdentity();
+            return new AuthenticationState(new ClaimsPrincipal(claimsIdentity));
+        }
+
+        public async Task NotifyStateChange()
+        {
+            Console.WriteLine($"Calling NotifyStateChange... with Auth={Authenticated}");
+            NotifyAuthenticationStateChanged(GetAuthenticationStateAsync());
+        }
+
+    }
+}