Verification token-based authorization identityserver4

problem:

　　aspnetcore services injected into a shuttle, why is there such a demand?

　　Because some programs are not aspnetcore, asp.net web api also want to access.

achieve:

　　// need to refer to the package, the minimum support 4.5

　　System.IdentityModel.Tokens.Jwt 5.6.0

　　The main code

　　// obtain the public key

 　   var json = httpclient acquired jwks;

　　var = Ctte Microsoft.IdentityModel.Tokens.JsonWebKeySet.Create (json);

　　// build parameter

       var parameters = new Microsoft.IdentityModel.Tokens.TokenValidationParameters ();
       parameter.IssuerSigningKeys jwk.GetSigningKeys = ();

　　// Verify enacted by
       parameter.ValidIssuer = "http: // localhost: 5000";

　　// verify that the resource
       parameter.ValidAudience = "api1";

       // verification token

　　var claimsPrincipal = new System.IdentityModel.Tokens.Jwt.JwtSecurityTokenHandler().ValidateToken(tokenString, parameter, out Microsoft.IdentityModel.Tokens.SecurityToken token);