JWT和Web API（JWTAUTHFORWebAPI？）--寻找榜样

Question

我相信我已经确定了JwtAuthForWebAPI，因此使用它的示例将非常棒。

我假设任何未用[Authorize]修饰的方法都将一如既往地工作，并且如果客户端传递的令牌不匹配，任何用[Authorize]修饰的方法都将401。

我还不知道如何在初始身份验证时将令牌发送回客户端。

RegisterRoutes(GlobalConfiguration.Configuration.Routes);
var builder = new SecurityTokenBuilder();
var jwtHandler = new JwtAuthenticationMessageHandler
{
    AllowedAudience = "http://xxxx.com",
    Issuer = "corp",
    SigningToken = builder.CreateFromKey(Convert.ToBase64String(new byte[]{4,2,2,6}))
};

GlobalConfiguration.Configuration.MessageHandlers.Add(jwtHandler);

Answer 1

最后，我不得不从几个不同的地方获取信息，以创建一个适合我的解决方案（实际上，是一个可行的生产解决方案的开始--但它起作用了！）

我摆脱了JwtAuthForWebAPI（尽管我确实从它借用了一部分，允许没有授权头的请求流经不受[Authorize]保护的WebAPI控制器方法）。

相反，我使用的是Microsoft的JWT库（用于Microsoft.NET Framework的JSON Web令牌处理程序-来自NuGet）。

方法如下：

[HttpPost]
public LoginResult PostSignIn([FromBody] Credentials credentials)
{
    var auth = new LoginResult() { Authenticated = false };

    if (TryLogon(credentials.UserName, credentials.Password))
    {
        var tokenDescriptor = new SecurityTokenDescriptor
        {
            Subject = new ClaimsIdentity(new[]
            {
                new Claim(ClaimTypes.Name, credentials.UserName), 
                new Claim(ClaimTypes.Role, "Admin")
            }),

            AppliesToAddress = ConfigurationManager.AppSettings["JwtAllowedAudience"],
            TokenIssuerName = ConfigurationManager.AppSettings["JwtValidIssuer"],
            SigningCredentials = new SigningCredentials(new 
                InMemorySymmetricSecurityKey(JwtTokenValidationHandler.SymmetricKey),
                "http://www.w3.org/2001/04/xmldsig-more#hmac-sha256",
                "http://www.w3.org/2001/04/xmlenc#sha256")
            };

            var tokenHandler = new JwtSecurityTokenHandler();
            var token = tokenHandler.CreateToken(tokenDescriptor);
            var tokenString = tokenHandler.WriteToken(token);

            auth.Token = tokenString;
            auth.Authenticated = true;
        }

    return auth;
}

更新

有一个关于在后续请求中处理令牌的问题。我所做的是创建一个DelegatingHandler来尝试读取/解码令牌，然后创建一个主体并将其设置为Thread.CurrentPrincipal和HttpContext.Current.User（您需要将其设置为两者）。最后，我用适当的访问限制来修饰控制器方法。

private static bool TryRetrieveToken(HttpRequestMessage request, out string token)
{
    token = null;
    IEnumerable<string> authzHeaders;
    if (!request.Headers.TryGetValues("Authorization", out authzHeaders) || authzHeaders.Count() > 1)
    {
        return false;
    }
    var bearerToken = authzHeaders.ElementAt(0);
    token = bearerToken.StartsWith("Bearer ") ? bearerToken.Substring(7) : bearerToken;
    return true;
}


protected override Task<HttpResponseMessage> SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
{
    HttpStatusCode statusCode;
    string token;

    var authHeader = request.Headers.Authorization;
    if (authHeader == null)
    {
        // missing authorization header
        return base.SendAsync(request, cancellationToken);
    }

    if (!TryRetrieveToken(request, out token))
    {
        statusCode = HttpStatusCode.Unauthorized;
        return Task<HttpResponseMessage>.Factory.StartNew(() => new HttpResponseMessage(statusCode));
    }

    try
    {
        JwtSecurityTokenHandler tokenHandler = new JwtSecurityTokenHandler();
        TokenValidationParameters validationParameters =
            new TokenValidationParameters()
            {
                AllowedAudience = ConfigurationManager.AppSettings["JwtAllowedAudience"],
                ValidIssuer = ConfigurationManager.AppSettings["JwtValidIssuer"],
                SigningToken = new BinarySecretSecurityToken(SymmetricKey)
            };

        IPrincipal principal = tokenHandler.ValidateToken(token, validationParameters);
        Thread.CurrentPrincipal = principal;
        HttpContext.Current.User = principal;

        return base.SendAsync(request, cancellationToken);
    }
    catch (SecurityTokenValidationException e)
    {
        statusCode = HttpStatusCode.Unauthorized;
    }
    catch (Exception)
    {
        statusCode = HttpStatusCode.InternalServerError;
    }

    return Task<HttpResponseMessage>.Factory.StartNew(() => new HttpResponseMessage(statusCode));
}

public static void Start()
{
    GlobalConfiguration.Configuration.MessageHandlers.Add(new JwtTokenValidationHandler());
}

[Authorize(Roles = "OneRoleHere")]
[GET("/api/admin/settings/product/allorgs")]
[HttpGet]
public List<Org> GetAllOrganizations()
{
    return QueryableDependencies.GetMergedOrganizations().ToList();
}

[Authorize(Roles = "ADifferentRoleHere")]
[GET("/api/admin/settings/product/allorgswithapproval")]
[HttpGet]
public List<ApprovableOrg> GetAllOrganizationsWithApproval()
{
    return QueryableDependencies.GetMergedOrganizationsWithApproval().ToList();
}