Question

我一直在玩 blazor 和 .net 5.0。我遇到了一个简单但烦人的问题：我正在尝试从 API 加载数据，但对 Server blazor 的每次调用都希望用户登录。

我知道如果我们从 API 控制器中取出 [Authorize] 标签并且剃刀页面中没有 @attribute [Authorize]，那就是了。但是我很难理解为什么我的 API 调用仍然期望 protected override async Task OnInitializedAsync() 中的 AccessToken 错误消息并没有说明为什么。

Microsoft.AspNetCore.Components.WebAssembly.Authentication.AccessTokenNotAvailableException: ''
at Microsoft.AspNetCore.Components.WebAssembly.Authentication.AuthorizationMessageHandler.SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
at Microsoft.Extensions.Http.Logging.LoggingScopeHttpMessageHandler.SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
at System.Net.Http.HttpClient.SendAsyncCore(HttpRequestMessage request, HttpCompletionOption completionOption, Boolean async, Boolean emitTelemetryStartStop, CancellationToken cancellationToken)

我还没有接触过应用程序。 web程序集的.cs文件..

有人可以帮忙吗。

<CascadingAuthenticationState>
    <Router AppAssembly="@typeof(Program).Assembly" PreferExactMatches="@true">
        <Found Context="routeData">
            <AuthorizeRouteView RouteData="@routeData" DefaultLayout="@typeof(MainLayout)">
                <NotAuthorized>
                    @if (!context.User.Identity.IsAuthenticated)
                    {
                        <RedirectToLogin />
                    }
                    else
                    {
                        <p>You are not authorized to access this resource.</p>
                    }
                </NotAuthorized>
                <Authorizing>
                    <h4>Authentication in progress...</h4>
                </Authorizing>                
            </AuthorizeRouteView>
        </Found>
        <NotFound>
            <LayoutView Layout="@typeof(MainLayout)">
                <p>Sorry, there's nothing at this address.</p>
            </LayoutView>
        </NotFound>
    </Router>
</CascadingAuthenticationState>

Answer 1

我认为这是因为您有 CascadingAuthenticationState 封装了 Foundcontext 和 NotFound，因为它的作用是将授权信息传递给其他组件。因此，将其包裹在所有组件中可以防止未经授权的用户访问。试试这个

<Router AppAssembly="@typeof(Program).Assembly" PreferExactMatches="@true">
    <Found Context="routeData">
        <AuthorizeRouteView RouteData="@routeData" DefaultLayout="@typeof(MainLayout)">
            <NotAuthorized>
                @if (!context.User.Identity.IsAuthenticated)
                {
                    <RedirectToLogin />
                }
                else
                {
                    <p>You are not authorized to access this resource.</p>
                }
            </NotAuthorized>
            <Authorizing>
                <h4>Authentication in progress...</h4>
            </Authorizing>                
        </AuthorizeRouteView>
    </Found>
    <NotFound>
        <CascadingAuthenticationState>
            <LayoutView Layout="@typeof(MainLayout)">
                <p>Sorry, there's nothing at this address.</p>
            </LayoutView>
        <CascadingAuthenticationState>
    </NotFound>
</Router>

Answer 2

我认为解决方案......应该先看看它。

它实际上是客户项目中的 App.CS 填写。 Http 端点在那里启动，默认情况下，代码生成将 BaseAddressAuthorizationMessageHandler 添加到 httpclient。

builder.Services.AddHttpClient("private", client => client.BaseAddress = new Uri(builder.HostEnvironment.BaseAddress))
       .AddHttpMessageHandler<BaseAddressAuthorizationMessageHandler>();

我的解决方法是使用命名客户端，一个用于私人，另一个用于公共

builder.Services.AddHttpClient("private", client => client.BaseAddress = new Uri(builder.HostEnvironment.BaseAddress))
    .AddHttpMessageHandler<BaseAddressAuthorizationMessageHandler>();

builder.Services.AddHttpClient("public", client => client.BaseAddress = new Uri(builder.HostEnvironment.BaseAddress));

并在页面中注入 IHttpClientFactory

@inject IHttpClientFactory ClientFactory

并从工厂创建一个命名客户端。

var client = ClientFactory.CreateClient("public");

这奏效了。

Blazor 身份验证 - Http 调用确实适用于匿名

2 个答案: