btcpayserver/BTCPayServer/Validations/ExtPubKeyValidator.cs

using NBitcoin;
using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.Text;

namespace BTCPayServer.Validations
{
    public class ExtPubKeyValidatorAttribute :  ValidationAttribute
	{
		protected override ValidationResult IsValid(object value, ValidationContext validationContext)
		{
			if(value == null)
			{
				return ValidationResult.Success;
			}
			var network = (Network)validationContext.GetService(typeof(Network));
			if(network == null)
				return new ValidationResult("No Network specified");
			try
			{
				new BitcoinExtPubKey((string)value, network);
				return ValidationResult.Success;
			}
			catch(Exception ex)
			{
				return new ValidationResult(ex.Message);
			}
		}
	}
}