Mongodb数据存储的asp.net核心中基于令牌的简单身份验证/授权

Question

我需要实现非常简单的auth mechanizm,基本上有2个角色:Owners和Users.而且我认为拥有Enum就足够了.应用程序本身是SPA,通过Asp.net核心实现webapi.我看到了文章 - 如何使用EF Identity实现它,但是他们的模型看起来比我实际需要的复杂得多,并且EF面向SQL db,我使用mongo.所以我的用户看起来像:

class UserModel{
    Id, 
    Token, 
    Roles: ["Owners", "Users"],
    ...
}

那么我需要实现哪些接口并添加到DI才能使用 [Authorize]和[Authorize(Roles="Users")]属性,并且它们根据我在标头中发送的令牌正常工作？

Answer 1

让我澄清一点@Adem的答案.您需要以特定方式实现自定义中间件.有三个抽象类需要实现来实现这个(答案对于asp.net core rc2btw来说是正确的):

Microsoft.AspNetCore.Builder.AuthenticationOptions Microsoft.AspNetCore.Authentication.AuthenticationMiddleware<TOptions> Microsoft.AspNetCore.Authentication.AuthenticationHandler<TOptions>

然后将此中间件添加到您的启动类.

代码示例:

public class TokenOptions : AuthenticationOptions
    {
        public TokenOptions() : base()
        {
            AuthenticationScheme = "Bearer";
            AutomaticAuthenticate = true;
        }
    }

public class AuthMiddleware : AuthenticationMiddleware<TokenOptions>
{
    protected override AuthenticationHandler<TokenOptions> CreateHandler()
    {
       return new AuthHandler(new TokenService());
    }

    public AuthMiddleware(RequestDelegate next, IOptions<TokenOptions> options, ILoggerFactory loggerFactory, UrlEncoder encoder) : base(next, options, loggerFactory, encoder)
    {
    }
}

public class AuthHandler : AuthenticationHandler<TokenOptions>
{
    private ITokenService _tokenService;

    public AuthHandler(ITokenService tokenService)
    {
        _tokenService = tokenService;
    }

    protected override async Task<AuthenticateResult> HandleAuthenticateAsync()
    {
        string token = null;
        AuthenticateResult result = null;
        string token = Helper.GetTokenFromHEader(Request.Headers["Authorization"]);
        // If no token found, no further work possible
        if (string.IsNullOrEmpty(token))
        {
            result = AuthenticateResult.Skip();
        }
        else
        {
            bool isValid = await _tokenService.IsValidAsync(token);
            if (isValid)
            {
                //assigning fake identity, just for illustration
                ClaimsIdentity claimsIdentity = new ClaimsIdentity("Custom");
                var claims = new List<Claim>();
                claims.Add(new Claim(ClaimTypes.Name, "admin"));
                claims.Add(new Claim(ClaimTypes.NameIdentifier, "admin"));
                claims.Add(new Claim(ClaimTypes.Role, "admin"));
                ClaimsPrincipal claimsPrincipal = new ClaimsPrincipal(claimsIdentity);
                result =
                    AuthenticateResult.Success(new AuthenticationTicket(claimsPrincipal,
                        new AuthenticationProperties(), Options.AuthenticationScheme));
            }
            else
            {
                result = AuthenticateResult.Skip();
            }
        }

        return result;
    }
}`

ps代码只是为了说明想法.当然,您需要实现自己的处理程序.

Answer 2

您可以使用自定义middleware来验证用户和设置claims(名称,角色等).

我会尝试写一个简单的middleware:

首先创建一个middlware class:

public class CustomMiddleware
{
    private readonly RequestDelegate _next;
    private readonly UserRepository _userRepository;

    public CustomMiddleware(RequestDelegate next, UserRepository userRepository)
    {
        _next = next;
        _userRepository = userRepository; 
    }

    public async Task Invoke(HttpContext context)
    {
        string token = context.Request.Headers["Token"];
        var user = _userRepository.Get(token);
        ClaimsIdentity claimsIdentity = new ClaimsIdentity("Custom");
        var claims = new List<Claim>();
        claims.Add(new Claim(ClaimTypes.Name, "admin"));
        claims.Add(new Claim(ClaimTypes.NameIdentifier, "admin"));
        foreach(var role in user.Roles)
        {
            claims.Add(ClaimTypes.Role, role);
        }
        ClaimsPrincipal claimsPrincipal = new ClaimsPrincipal(claimsIdentity);
        context.User = claimsPrincipal;
        await _next(context);
    }
}

然后使用middleware在Startup.cs这样的:

   public void Configure(IApplicationBuilder app)
    {
        app.UseMiddleware<CustomMiddleware>();
        ...
    }

最后使用Authorize属性:

[Authorize(Roles = "Users")]
public IActionResult Index()
{
}