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How to Get Claim Values from JWT Token

28.06.2018 (👁8489)

Query JWT Token Claim

 

How can one query the user of an Jwt token in the web server?

 

The Java WebToken contains so-called claims. This claim information can be requested during the exchange.

The user of a claim can be determined by a request in Asp Controller with Claims / Name

var user_in_token = HttpContext.User.Claims.Where(c => c.Type == ClaimsIdentity.DefaultNameClaimType).FirstOrDefault();

 

Result in this case:

Identity user name is: myUser

 

 

The jwtToken was created in the TokenController

public string create_UserToken(string sUsername)

{

    //-------------< create_UserToken() >-------------

    Claim[] claims = new Claim[] {

        new Claim(ClaimTypes.Name, sUsername), //*->User.Identity.Name or "Raimund Popp"

        new Claim(JwtRegisteredClaimNames.Email, "raimund.popp@codedocu.de")

    };

 

 

    //--< Create a Token >--

    JwtSecurityToken jwtToken = new JwtSecurityToken(

        issuer: "website_freelancer",    //ASP.NET Core web application

        audience: "webclients_freelancer"//client app

        claims: claims,

        notBefore: DateTime.Now,

        expires: DateTime.Now.AddDays(1),

        signingCredentials: new SigningCredentials(_secretKey, SecurityAlgorithms.HmacSha256)

    );

    //--</ Create a Token >--

 

 

    string stringToken = new JwtSecurityTokenHandler().WriteToken(jwtToken);

 

    return stringToken;

    //-------------</ create_UserToken() >-------------

}

 

 

 

 

Among the claims you can include many predefined information

 

Claim[] claims = new Claim[] {

    new Claim(ClaimTypes.Name, sUsername), //*->User.Identity.Name or "Raimund Popp"

    new Claim(ClaimTypes.UserData, "ID=123"),

    new Claim(JwtRegisteredClaimNames.Email, "raimund.popp@codedocu.de")

 

};

 

 

A list of the ClaimTypes can be found at

[Lnk "https://msdn.microsoft.com/de-de/library/system.security.claims.claimtypes(v=vs.110).aspx" /]

 

the most important claim types would be (namespace: System.Security.Claims)

Email

Name

NameIdentifier [lnk: "" /]

UserData

 

Asp.Net Core 2 MVC

Asp Web Api Api

JWT Java Web Token