Wino-Mail/Wino.Core.UWP/Services/ThumbnailService.cs

using System;
using System.Linq;
using System.Net.Mail;

namespace Wino.Core.UWP.Services
{
    public static class ThumbnailService
    {
        private static string[] knownCompanies = new string[]
        {
            "microsoft.com", "apple.com", "google.com", "steampowered.com", "airbnb.com", "youtube.com", "uber.com"
        };

        public static bool IsKnown(string mailHost) => !string.IsNullOrEmpty(mailHost) && knownCompanies.Contains(mailHost);

        public static string GetHost(string address)
        {
            if (string.IsNullOrEmpty(address))
                return string.Empty;

            if (address.Contains('@'))
            {
                var splitted = address.Split('@');

                if (splitted.Length >= 2 && !string.IsNullOrEmpty(splitted[1]))
                {
                    try
                    {
                        return new MailAddress(address).Host;
                    }
                    catch (Exception)
                    {
                        // TODO: Exceptions are ignored for now.
                    }
                }
            }

            return string.Empty;
        }

        public static Tuple<bool, string> CheckIsKnown(string host)
        {
            // Check known hosts.
            // Apply company logo if available.

            try
            {
                var last = host.Split('.');

                if (last.Length > 2)
                    host = $"{last[last.Length - 2]}.{last[last.Length - 1]}";
            }
            catch (Exception)
            {
                return new Tuple<bool, string>(false, host);
            }

            return new Tuple<bool, string>(IsKnown(host), host);
        }

        public static string GetKnownHostImage(string host)
            => $"ms-appx:///Assets/Thumbnails/{host}.png";
    }
}