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JWT不能用Blazor存储在ASP.NET内核中

blazor jwt asp.net-core c#

4

Westerlund.io · 技术社区 · 6 年前

我遵循了以下教程: https://medium.com/@st.mas29/microsoft-blazor-web-api-with-jwt-authentication-part-1-f33a44abab9d

我下载了示例: https://github.com/StuwiiDev/DotnetCoreJwtAuthentication/tree/Part2

SampleDataController ,具有 Authorize 标记,则返回401。

当使用Postman调用和添加令牌时,它可以工作。

Microsoft.AspNetCore.Authentication.JwtBearer 处理客户端部分(存储令牌)?

3 回复 | 直到 6 年前

1

12

itminus 5 年前

对我的用户进行身份验证缺少什么?Microsoft.AspNetCore.Authentication.JwtBearer不处理客户端部分(存储令牌)吗?

JwtBearer 在服务器端运行,只验证请求的授权头,即 Authorization: Bearer your_access_token ,并且不关心WebAssembly代码如何运行。所以您需要使用jwt accessToken发送请求。因为教程建议您使用 localStorage ,让我们存储 accessToken .

WebAssembly 无法访问 BOM helper.js 在 JwtAuthentication.Client/wwwroot/js/ :

var wasmHelper = {};

wasmHelper.ACCESS_TOKEN_KEY ="__access_token__";

wasmHelper.saveAccessToken = function (tokenStr) {
    localStorage.setItem(wasmHelper.ACCESS_TOKEN_KEY,tokenStr);
};

wasmHelper.getAccessToken = function () {
    return localStorage.getItem(wasmHelper.ACCESS_TOKEN_KEY);
};

在你的书里引用剧本 JwtAuthentication.Client/wwwroot/index.html

<body>
    <app>Loading...</app>
    <script src="js/helper.js"></script>
    <script src="_framework/blazor.webassembly.js"></script>
</body>

现在,让我们将javascript代码包装到C#。创建新文件 Client/Services/TokenService.cs :

public class TokenService
{
    public Task SaveAccessToken(string accessToken) {
        return JSRuntime.Current.InvokeAsync<object>("wasmHelper.saveAccessToken",accessToken);
    }
    public Task<string> GetAccessToken() {
        return JSRuntime.Current.InvokeAsync<string>("wasmHelper.getAccessToken");
    }
}

// file: Startup.cs 
services.AddSingleton<TokenService>(myTokenService);

现在我们可以注射 TokenService Login.cshtml

@using JwtAuthentication.Client.Services
// ...
@page "/login"
// ...
@inject TokenService tokenService

// ...

@functions {
    public string Email { get; set; } = "";
    public string Password { get; set; } = "";
    public string Token { get; set; } = "";


    /// <summary>
    /// response from server
    /// </summary>
    private class TokenResponse{
        public string Token;
    }

    private async Task SubmitForm()
    {
        var vm = new TokenViewModel
        {
            Email = Email,
            Password = Password
        };

        var response = await Http.PostJsonAsync<TokenResponse>("http://localhost:57778/api/Token", vm);
        await tokenService.SaveAccessToken(response.Token);
    }
}

假设您希望在 FetchData.cshtml

@functions {
    WeatherForecast[] forecasts;


    protected override async Task OnInitAsync()
    {
        var token = await tokenService.GetAccessToken();
        Http.DefaultRequestHeaders.Add("Authorization",String.Format("Bearer {0} ",token));
        forecasts = await Http.GetJsonAsync<WeatherForecast[]>("api/SampleData/WeatherForecasts");
    }
}

结果是:

2

3

Oliver 6 年前

如果它能帮助其他同样在Blazor应用程序中寻找JWT解决方案的人,我发现@itminus answer非常有用,但它也为我指明了另一个方向。

我发现的一个问题是 FetchData.cshtml Authorization 第二次头球。

SubmitForm 在里面 Login.cshtml

    protected async Task SubmitForm()
    {
        // Remove any existing Authorization headers
        Http.DefaultRequestHeaders.Remove("Authorization");

        TokenViewModel vm = new TokenViewModel()
        {
            Email = Email,
            Password = Password
        };

        TokenResponse response = await Http.PostJsonAsync<TokenResponse>("api/Token/Login", vm);

        // Now add the token to the Http singleton
        Http.DefaultRequestHeaders.Add("Authorization", string.Format("Bearer {0} ", response.Token));
    }

然后我意识到,我正在构建一个SPA,所以我根本不需要在请求之间持久化令牌—它只是连接到HttpClient。

3

2

enet 6 年前

下面的类处理客户机上的登录过程,将JWT令牌存储在 local 储存。注意:开发人员负责存储JWT令牌,并将其传递给服务器。客户机(Blazor、Angular等)不会自动为他这样做。

public class SignInManager
    {
        // Receive 'http' instance from DI
        private readonly HttpClient http;
        public SignInManager(HttpClient http)
        {
            this.http = http;
        }

        [Inject]
        protected LocalStorage localStorage;


        public bool IsAuthenticated()
        {
            var token = localStorage.GetItem<string>("token");

            return (token != null); 
        }

        public string getToken()
        {
            return localStorage.GetItem<string>("token");
        }

        public void Clear()
        {
            localStorage.Clear();
        }


        // model.Email, model.Password, model.RememberMe, lockoutOnFailure: false
        public async Task<bool> PasswordSignInAsync(LoginViewModel model)
        {
            SearchInProgress = true;
            NotifyStateChanged();

            var result = await http.PostJsonAsync<Object>("/api/Account", model);

            if (result)// result.Succeeded
           {
              _logger.LogInformation("User logged in.");

              // Save the JWT token in the LocalStorage
              // https://github.com/BlazorExtensions/Storage
              await localStorage.SetItem<Object>("token", result);


              // Returns true to indicate the user has been logged in and the JWT token 
              // is saved on the user browser
             return true;

           }

        }
    }

public async Task<IList<Profile>> GetProfiles()
        {   
            SearchInProgress = true;
            NotifyStateChanged();

            var token = signInManager.getToken();
            if (token == null) {
                throw new ArgumentNullException(nameof(AppState)); //"No token";
            }

            this.http.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer", token);

            // .set('Content-Type', 'application/json')
            // this.http.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer", token);

            Profiles = await this.http.GetJsonAsync<Profile[]>("/api/Profiles");


            SearchInProgress = false;
            NotifyStateChanged();
        }

//您还必须在客户机上设置Startup类,如下所示:

public void ConfigureServices(IServiceCollection services)
    {
        // Add Blazor.Extensions.Storage
       // Both SessionStorage and LocalStorage are registered
       // https://github.com/BlazorExtensions/Storage
       **services.AddStorage();**

      ...
    }

//一般来说,这是你必须对客户做的事在服务器上,您必须有一个方法,比如在Account controller中,它的功能是生成JWT令牌,您必须配置JWT中间件,用必要的属性注释控制器,例如:

[Authorize(AuthenticationSchemes = JwtBearerDefaults.AuthenticationScheme)]

等等。。。

希望这有帮助。。。