dd4t-publication-resolver

    public class PublicationResolver : IPublicationResolver
    {
        private readonly DynamicMappingsRetriever _mappingsRetriever;

        public PublicationResolver()
        {
            _mappingsRetriever = new DynamicMappingsRetriever();
        }

        public int ResolvePublicationId()
        {
            return this.Resolve().PublicationId;
        }
        private int Resolve()
        {
            var url = HttpContext.Current.Request.Url.GetLeftPart(UriPartial.Path);
            int espaceIndex = url.IndexOf("%");
            if (espaceIndex > 0)
            {
               url = url.Substring(0, espaceIndex);
            }

            try
            {
                var mapping = _mappingsRetriever.GetPublicationMapping(url);

                if (mapping == null || (!mapping.Port.IsNullOrEmpty() && mapping.Port != uri.Port.ToString()))
                {
                    throw new Exception("publicationId not found");
                }
                return mapping.PublicationId;
            }
            catch (Exception ex)
            {
               throw new Exception("publicationId not found", ex);
            }
        }
    }