How can I manually check the JWT Asp.Net Core?

Question

There are millions of travel guides, and none of them seem to be doing what I need. I am creating an authentication server that just needs to issue and verify / reissue tokens. Therefore, I cannot create a middleware class for the "VALIDATE" cookie or header. I just get the POST line, and I need to check the token this way, and not the Authorizemiddleware that the .net core provides.

My Startup Consists of the only Token Emer Example in which I could work.

public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory loggerFactory)
        {
            loggerFactory.AddConsole(Configuration.GetSection("Logging"));
            loggerFactory.AddDebug();

            app.UseExceptionHandler("/Home/Error");

            app.UseStaticFiles();
            var secretKey = "mysupersecret_secretkey!123";
            var signingKey = new SymmetricSecurityKey(Encoding.ASCII.GetBytes(secretKey));

            var options = new TokenProviderOptions
            {

                // The signing key must match!
                Audience = "AllApplications",
                SigningCredentials = new SigningCredentials(signingKey, SecurityAlgorithms.HmacSha256),

                Issuer = "Authentication"
            };
            app.UseMiddleware<TokenProviderMiddleware>(Microsoft.Extensions.Options.Options.Create(options));

, . Startup.cs, , .

private async Task GenerateToken(HttpContext context)
{
    CredentialUser usr = new CredentialUser();

    using (var bodyReader = new StreamReader(context.Request.Body))
    {
        string body = await bodyReader.ReadToEndAsync();
        usr = JsonConvert.DeserializeObject<CredentialUser>(body);
    }

    ///get user from Credentials put it in user variable. If null send bad request

    var now = DateTime.UtcNow;

    // Specifically add the jti (random nonce), iat (issued timestamp), and sub (subject/user) claims.
    // You can add other claims here, if you want:
    var claims = new Claim[]
    {
        new Claim(JwtRegisteredClaimNames.Sub, JsonConvert.SerializeObject(user)),
        new Claim(JwtRegisteredClaimNames.Jti, Guid.NewGuid().ToString()),
        new Claim(JwtRegisteredClaimNames.Iat, now.ToString(), ClaimValueTypes.Integer64)
    };

    // Create the JWT and write it to a string
    var jwt = new JwtSecurityToken(
        issuer: _options.Issuer,
        audience: _options.Audience,
        claims: claims,
        notBefore: now,
        expires: now.Add(_options.Expiration),
        signingCredentials: _options.SigningCredentials);
    var encodedJwt = new JwtSecurityTokenHandler().WriteToken(jwt);

    ///fill response with jwt
}

Deserialize CredentialUser json, , . .

jwt, -, jwt.io, , , , ,

    {
         "sub": " {User_Object_Here} ",
         "jti": "96914b3b-74e2-4a68-a248-989f7d126bb1",
         "iat": "6/28/2017 4:48:15 PM",
         "nbf": 1498668495,
         "exp": 1498668795,
         "iss": "Authentication",
         "aud": "AllApplications"
    }

, , , . , . Authorize , . .

[Route("api/[controller]")]
public class ValidateController : Controller
{

    [HttpPost]
    [ValidateAntiForgeryToken]
    public async Task<IActionResult> Validate(string token)
    {
        var validationParameters = new TokenProviderOptions()
        {
            Audience = "AllKSDEApplications",
            SigningCredentials = new 
            SigningCredentials("mysupersecret_secretkey!123", 
            SecurityAlgorithms.HmacSha256),

            Issuer = "Authentication"
        };
        var decodedJwt = new JwtSecurityTokenHandler().ReadJwtToken(token);
        var valid = new JwtSecurityTokenHandler().ValidateToken(token, //The problem is here
        /// I need to be able to pass in the .net TokenValidParameters, even though
        /// I have a unique jwt that is TokenProviderOptions. I also don't know how to get my user object out of my claims
    }
}