Authentication .NET Core gRpc service with JWT - sample3.cs

public class JwtTokenValidator : ISecurityTokenValidator
{
    public bool CanReadToken(string securityToken) => true;
    
    public ClaimsPrincipal ValidateToken(string securityToken, TokenValidationParameters validationParameters, out SecurityToken validatedToken)
    {
        var handler = new JwtSecurityTokenHandler();
        var tokenValidationParameters = new TokenValidationParameters
        {
            ValidateIssuer = true,
            ValidateAudience = true,
            ValidateLifetime = true,
            ValidateIssuerSigningKey = true,
            ValidIssuer = "your string",
            ValidAudience = "your string",
            IssuerSigningKey = new SymmetricSecurityKey(Encoding.UTF8.GetBytes("your secrete code"))
        };
        
        var claimsPrincipal = handler.ValidateToken(token, tokenValidationParameters, out validatedToken);
        return claimsPrincipal;
    }
    
    public bool CanValidateToken { get; } = true;
    public int MaximumTokenSizeInBytes { get; set; } = int.MaxValue;
}