Why my Authentication State Provider not work?

问题

I use blazor with server side render and I want to do my own AuthenticationStateProvider, but it's not work and I do not know why.

My ovveride method in public class LocalAuthenticationStateProvider : AuthenticationStateProvider:

    public async override Task<AuthenticationState> GetAuthenticationStateAsync()
    {
        if (await _storageService.ContainKeyAsync("User"))
        {
            var userInfo = await _storageService.GetItemAsync<LocalUserInfo>("User");

            var claims = new[]
            {
                new Claim("Email", userInfo.Email),
                new Claim("FirstName", userInfo.FirstName),
                new Claim("LastName", userInfo.LastName),
                new Claim("AccessToken", userInfo.AccessToken),
                new Claim(ClaimTypes.NameIdentifier, userInfo.Id),
            };

            var identity = new ClaimsIdentity(claims, "BearerToken");
            var user = new ClaimsPrincipal(identity);
            var state = new AuthenticationState(user);
            NotifyAuthenticationStateChanged(Task.FromResult(state));
            return state;
        }

        return new AuthenticationState(new ClaimsPrincipal());
    }

My Login Page:

@inject AuthenticationStateProvider authenticationStateProvider

await storageService.SetItemAsync("User", userInfo);
await authenticationStateProvider.GetAuthenticationStateAsync();

navigationManager.NavigateTo("/");

My Startup.cs

        services.AddAuthentication();
        services.AddAuthorization();
        services.AddAuthorizationCore();
        services.AddScoped<AuthenticationStateProvider, LocalAuthenticationStateProvider>();

My Index.razor for check auth. This always NotAuthorized

<AuthorizeView>
<Authorized>
    <h1>Hi! @context.User.FindFirst("FirstName").Value</h1>
</Authorized>
<NotAuthorized>
    <RadzenButton Text="login" Click="GoToRegister"></RadzenButton>
</NotAuthorized>
<Authorizing>
    <h1>Authentication in progress</h1>
    <p>Only visible while authentication is in progress.</p>
</Authorizing>

What's wrong with that?

回答1:

In your Login page you should inject LocalAuthenticationStateProvider

@inject LocalAuthenticationStateProvider LocalAuthStateProvider

After doing:

await storageService.SetItemAsync("User", userInfo);

which I guess, storing the user's information, let subscribers, such as the CascadingAuthenticationState, know that the Authentication state has been changed. This is done so:

LocalAuthStateProvider.NotifyAuthenticationStateChanged();

Your custom AuthenticationStateProvider should be like the following:

public async override Task<AuthenticationState> GetAuthenticationStateAsync()
{
    ClaimsIdentity identity;

    if (await _storageService.ContainKeyAsync("User"))
    {
        var userInfo = await _storageService.GetItemAsync<LocalUserInfo> 
                                                                ("User");

        var claims = new[]
        {
            new Claim("Email", userInfo.Email),
            new Claim("FirstName", userInfo.FirstName),
            new Claim("LastName", userInfo.LastName),
            new Claim("AccessToken", userInfo.AccessToken),
            new Claim(ClaimTypes.NameIdentifier, userInfo.Id),
        };

        identity = new ClaimsIdentity(claims );


    }
    else
    {
          identity = new ClaimsIdentity();
    }
    return await Task.FromResult(new AuthenticationState(new 
                                             ClaimsPrincipal(identity)));

}

public void NotifyAuthenticationStateChanged()
{
        NotifyAuthenticationStateChanged(GetAuthenticationStateAsync());
 }

And your Startup class should be like this:

public void ConfigureServices(IServiceCollection services)
    {
        services.AddAuthentication();
        services.AddAuthorization();
       // services.AddAuthorizationCore();

        services.AddScoped<LocalAuthenticationStateProvider>();
        services.AddScoped<AuthenticationStateProvider>(provider => provider.GetRequiredService<LocalAuthenticationStateProvider>());

    }

Hope this helps...

来源：https://stackoverflow.com/questions/62332754/why-my-authentication-state-provider-not-work