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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,10 @@ | ||
| namespace BlazorApp.Client.BFF; | ||
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| public class AntiforgeryHandler : DelegatingHandler | ||
| { | ||
| protected override Task<HttpResponseMessage> SendAsync(HttpRequestMessage request, CancellationToken cancellationToken) | ||
| { | ||
| request.Headers.Add("X-CSRF", "1"); | ||
| return base.SendAsync(request, cancellationToken); | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,103 @@ | ||
| using System.Net; | ||
| using System.Net.Http.Json; | ||
| using System.Security.Claims; | ||
| using Microsoft.AspNetCore.Components.Authorization; | ||
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| namespace BlazorApp.Client.BFF; | ||
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| public class BffAuthenticationStateProvider : AuthenticationStateProvider | ||
| { | ||
| private static readonly TimeSpan UserCacheRefreshInterval = TimeSpan.FromSeconds(60); | ||
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| private readonly HttpClient _client; | ||
| private readonly ILogger<BffAuthenticationStateProvider> _logger; | ||
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| private DateTimeOffset _userLastCheck = DateTimeOffset.FromUnixTimeSeconds(0); | ||
| private ClaimsPrincipal _cachedUser = new(new ClaimsIdentity()); | ||
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| public BffAuthenticationStateProvider( | ||
| HttpClient client, | ||
| ILogger<BffAuthenticationStateProvider> logger) | ||
| { | ||
| _client = client; | ||
| _logger = logger; | ||
| } | ||
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| public override async Task<AuthenticationState> GetAuthenticationStateAsync() | ||
| { | ||
| var user = await GetUser(); | ||
| var state = new AuthenticationState(user); | ||
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| // checks periodically for a session state change and fires event | ||
| // this causes a round trip to the server | ||
| // adjust the period accordingly if that feature is needed | ||
| if (user.Identity.IsAuthenticated) | ||
| { | ||
| _logger.LogInformation("starting background check.."); | ||
| Timer? timer = null; | ||
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| timer = new Timer(async _ => | ||
| { | ||
| var currentUser = await GetUser(false); | ||
| if (currentUser.Identity.IsAuthenticated == false) | ||
| { | ||
| _logger.LogInformation("user logged out"); | ||
| NotifyAuthenticationStateChanged(Task.FromResult(new AuthenticationState(currentUser))); | ||
| await timer.DisposeAsync(); | ||
| } | ||
| }, null, 1000, 5000); | ||
| } | ||
|
|
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| return state; | ||
| } | ||
|
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| private async ValueTask<ClaimsPrincipal> GetUser(bool useCache = true) | ||
| { | ||
| var now = DateTimeOffset.Now; | ||
| if (useCache && now < _userLastCheck + UserCacheRefreshInterval) | ||
| { | ||
| _logger.LogDebug("Taking user from cache"); | ||
| return _cachedUser; | ||
| } | ||
|
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| _logger.LogDebug("Fetching user"); | ||
| _cachedUser = await FetchUser(); | ||
| _userLastCheck = now; | ||
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| return _cachedUser; | ||
| } | ||
|
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| public record ClaimRecord(string Type, object Value); | ||
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| private async Task<ClaimsPrincipal> FetchUser() | ||
| { | ||
| try | ||
| { | ||
| _logger.LogInformation("Fetching user information."); | ||
| var response = await _client.GetAsync("bff/user?slide=false"); | ||
|
|
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| if (response.StatusCode == HttpStatusCode.OK) | ||
| { | ||
| var claims = await response.Content.ReadFromJsonAsync<List<ClaimRecord>>(); | ||
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| var identity = new ClaimsIdentity( | ||
| nameof(BffAuthenticationStateProvider), | ||
| "name", | ||
| "role"); | ||
|
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| foreach (var claim in claims!) | ||
| { | ||
| identity.AddClaim(new Claim(claim.Type, claim.Value.ToString())); | ||
| } | ||
|
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| return new ClaimsPrincipal(identity); | ||
| } | ||
| } | ||
| catch (Exception ex) | ||
| { | ||
| _logger.LogWarning(ex, "Fetching user failed."); | ||
| } | ||
|
|
||
| return new ClaimsPrincipal(new ClaimsIdentity()); | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,16 +1,21 @@ | ||
| <Project Sdk="Microsoft.NET.Sdk.BlazorWebAssembly"> | ||
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| <PropertyGroup> | ||
| <TargetFramework>net7.0</TargetFramework> | ||
| <Nullable>enable</Nullable> | ||
| <ImplicitUsings>enable</ImplicitUsings> | ||
| </PropertyGroup> | ||
| <PropertyGroup> | ||
| <TargetFramework>net7.0</TargetFramework> | ||
| <Nullable>enable</Nullable> | ||
| <ImplicitUsings>enable</ImplicitUsings> | ||
| </PropertyGroup> | ||
|
|
||
| <ItemGroup> | ||
| <PackageReference Include="Microsoft.AspNetCore.Components.WebAssembly" Version="7.0.12" /> | ||
| <PackageReference Include="Microsoft.AspNetCore.Components.WebAssembly.Authentication" Version="7.0.12" /> | ||
| <PackageReference Include="Microsoft.AspNetCore.Components.WebAssembly.DevServer" Version="7.0.12" PrivateAssets="all" /> | ||
| <PackageReference Include="Microsoft.Extensions.Http" Version="7.0.0" /> | ||
| </ItemGroup> | ||
| <ItemGroup> | ||
| <PackageReference Include="Microsoft.AspNetCore.Components.WebAssembly" Version="7.0.12" /> | ||
| <PackageReference Include="Microsoft.AspNetCore.Components.WebAssembly.DevServer" Version="7.0.12" PrivateAssets="all" /> | ||
| <PackageReference Include="Microsoft.Extensions.Http" Version="7.0.0" /> | ||
| <PackageReference Include="Microsoft.AspNetCore.Components.WebAssembly.Authentication" Version="7.0.12" /> | ||
|
|
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| </ItemGroup> | ||
|
|
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| <ItemGroup> | ||
| <ProjectReference Include="..\BlazorShared\BlazorShared.csproj" /> | ||
| </ItemGroup> | ||
|
|
||
| </Project> |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,40 +1,5 @@ | ||
| @page "/" | ||
|
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| @using Microsoft.AspNetCore.Components.Authorization | ||
| @using Microsoft.AspNetCore.Components.WebAssembly.Authentication | ||
| @using System.Security.Claims | ||
|
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| @inject AuthenticationStateProvider AuthenticationStateProvider | ||
| @page "/" | ||
|
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| <PageTitle>Index</PageTitle> | ||
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| <h1>BlazorWASM Keycloak Authentication</h1> | ||
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| This application demonstrates how to integrate with Keycloak from BlazorWASM application. | ||
|
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| @if (claims.Count() > 0) | ||
| { | ||
| <h2>User Claims:</h2> | ||
| <ul> | ||
| @foreach (var claim in claims) | ||
| { | ||
| <li>@claim.Type: @claim.Value</li> | ||
| } | ||
| </ul> | ||
| } | ||
|
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| @code { | ||
| private IEnumerable<Claim> claims = Enumerable.Empty<Claim>(); | ||
|
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| protected override Task OnInitializedAsync() => GetClaimsPrincipalData(); | ||
|
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| private async Task GetClaimsPrincipalData() | ||
| { | ||
| var authState = await AuthenticationStateProvider.GetAuthenticationStateAsync(); | ||
| var user = authState.User; | ||
| if (user.Identity?.IsAuthenticated ?? false) | ||
| { | ||
| claims = user.Claims; | ||
| } | ||
| } | ||
| } | ||
| <CurrentSession /> |
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