System.IdentityModel.Tokens.JwtSecurityToken custom properties

System.IdentityModel.Tokens.JwtSecurityToken custom properties

You can add custom properties to a JwtSecurityToken in the claims section of the token payload. The JwtSecurityToken class inherits from the SecurityToken class, which has a Claims property that contains the claims associated with the token.

To add a custom property to a JwtSecurityToken, you can create a new Claim object and add it to the Claims collection of the token. Here's an example:

var customClaim = new Claim("myCustomProperty", "myCustomValue"); var claims = new List<Claim> { customClaim }; var jwt = new JwtSecurityToken( issuer: "myIssuer", audience: "myAudience", claims: claims, expires: DateTime.UtcNow.AddHours(1), signingCredentials: signingCredentials); var encodedJwt = new JwtSecurityTokenHandler().WriteToken(jwt);

In this example, we're creating a Claim object with the name "myCustomProperty" and the value "myCustomValue". We're then creating a list of claims containing the custom claim and passing it to the JwtSecurityToken constructor. Finally, we're using a JwtSecurityTokenHandler object to encode the token as a string.

When you decode the token on the receiving end, you can retrieve the custom property by searching for the corresponding claim:

var handler = new JwtSecurityTokenHandler(); var jwtToken = handler.ReadJwtToken(encodedJwt); var customClaim = jwtToken.Claims.FirstOrDefault(c => c.Type == "myCustomProperty"); if (customClaim != null) { var customValue = customClaim.Value; }

In this example, we're using a JwtSecurityTokenHandler object to decode the token and retrieve the claims. We're then searching the Claims collection for a claim with the name "myCustomProperty". If the claim is found, we retrieve its value and store it in the customValue variable.

Examples

  1. "Add custom properties to JwtSecurityToken C#"

    • Description: Learn how to include custom properties in a JWT using System.IdentityModel.Tokens.JwtSecurityToken in C#.
    • Code:
      // Code to create a JwtSecurityToken with custom properties var claims = new List<Claim> { new Claim("customClaimKey", "customClaimValue"), // Add other standard claims as needed }; var token = new JwtSecurityToken(claims: claims);

  2. "Read custom properties from JwtSecurityToken C#"

    • Description: Understand how to extract and use custom properties from a JwtSecurityToken in C#.
    • Code:
      // Code to read custom properties from JwtSecurityToken var customClaim = ((JwtSecurityToken)jwtToken).Claims.FirstOrDefault(c => c.Type == "customClaimKey"); string customClaimValue = customClaim?.Value;

  3. "JwtSecurityToken custom property validation"

    • Description: Implement validation for custom properties in JwtSecurityToken to enhance security and integrity.
    • Code:
      // Code to validate custom properties during JwtSecurityToken validation var validationParameters = new TokenValidationParameters { ValidateIssuerSigningKey = true, IssuerSigningKey = securityKey, ValidateIssuer = true, ValidIssuer = "validIssuer", // Add other validation parameters as needed }; var handler = new JwtSecurityTokenHandler(); handler.ValidateToken(jwtToken, validationParameters, out var validatedToken);

  4. "C# JwtSecurityToken custom property encryption"

    • Description: Explore methods to encrypt and secure custom properties within a JwtSecurityToken.
    • Code:
      // Code to encrypt custom properties before adding them to JwtSecurityToken var encryptedValue = EncryptCustomValue("customClaimValue"); var claims = new List<Claim> { new Claim("customClaimKey", encryptedValue), // Add other standard claims as needed }; var token = new JwtSecurityToken(claims: claims);

  5. "JwtSecurityToken custom property expiration"

    • Description: Set expiration and lifetime for custom properties within a JwtSecurityToken.
    • Code:
      // Code to set expiration for custom properties in JwtSecurityToken var claims = new List<Claim> { new Claim("customClaimKey", "customClaimValue"), // Add other standard claims as needed }; var token = new JwtSecurityToken(claims: claims, expires: DateTime.UtcNow.AddHours(1));

  6. "JwtSecurityToken custom property signing"

    • Description: Sign custom properties in JwtSecurityToken for data integrity and authenticity.
    • Code:
      // Code to sign JwtSecurityToken including custom properties var credentials = new SigningCredentials(securityKey, SecurityAlgorithms.HmacSha256); var token = new JwtSecurityToken(claims: claims, signingCredentials: credentials);

  7. "Handle JwtSecurityToken custom properties in ASP.NET Core"

    • Description: Learn how to work with custom properties in JwtSecurityToken within an ASP.NET Core application.
    • Code:
      // Code in ASP.NET Core to read custom properties from JwtSecurityToken var customClaim = HttpContext.User.Claims.FirstOrDefault(c => c.Type == "customClaimKey"); string customClaimValue = customClaim?.Value;

  8. "JwtSecurityToken custom property decoding"

    • Description: Decode and inspect the contents of custom properties within a JwtSecurityToken.
    • Code:
      // Code to decode JwtSecurityToken and inspect custom properties var handler = new JwtSecurityTokenHandler(); var jsonToken = handler.ReadToken(jwtToken) as JwtSecurityToken; var customClaimValue = jsonToken?.Payload["customClaimKey"];

  9. "Extend JwtSecurityToken with custom claims"

    • Description: Extend JwtSecurityToken with additional custom claims to carry more information.
    • Code:
      // Code to create a JwtSecurityToken with custom claims and standard claims var claims = new List<Claim> { new Claim("customClaimKey", "customClaimValue"), // Add other custom claims or standard claims as needed }; var token = new JwtSecurityToken(claims: claims);

  10. "JwtSecurityToken custom property audience validation"

    • Description: Validate custom property audience within JwtSecurityToken to ensure proper authorization.
    • Code:
      // Code to validate custom property audience during JwtSecurityToken validation var validationParameters = new TokenValidationParameters { ValidateIssuerSigningKey = true, IssuerSigningKey = securityKey, ValidateIssuer = true, ValidIssuer = "validIssuer", ValidateAudience = true, ValidAudience = "validAudience", // Add other validation parameters as needed }; var handler = new JwtSecurityTokenHandler(); handler.ValidateToken(jwtToken, validationParameters, out var validatedToken);

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