SpfExpression.cs

using System;
using System.Collections.Generic;
using System.Text;
 
namespace Waher.Security.SPF
{
    public class SpfExpression
    {
        private readonly string domain;
        private readonly string domainSuffix;
        private readonly string spf;
        private readonly bool includeSubdomains;
 
        public SpfExpression(string Domain, bool IncludeSubdomains, string Spf)
        {
            this.domain = Domain;
            this.domainSuffix = "+" + Domain;
            this.includeSubdomains = IncludeSubdomains;
            this.spf = Spf;
        }
 
        public string Domain => this.domain;
 
        public string Spf => this.spf;
 
        public bool IncludeSubdomains => this.includeSubdomains;
 
        public bool IsApplicable(string Domain)
        {
            if (string.Compare(Domain, this.domain, true) == 0)
                return true;
 
            if (this.includeSubdomains && Domain.EndsWith(this.domainSuffix, StringComparison.CurrentCultureIgnoreCase))
                return true;
 
            return false;
        }
    }
}