Umbraco CdnMediaUrlProvider

CdnMediaUrlProvider.cs

public class CdnMediaUrlProvider : IMediaUrlProvider
    {
        public virtual UrlInfo GetMediaUrl(
            UmbracoContext umbracoContext,
            IPublishedContent content,
            string propertyAlias,
            UrlMode mode,
            string culture,
            Uri current)
        {
            var prop = content.GetProperty(propertyAlias);
            var value = prop?.GetValue(culture);
            if (value == null)
            {
                return null;
            }

            var propType = prop.PropertyType;
            string path = null;

            switch (propType.EditorAlias)
            {
                case Constants.PropertyEditors.Aliases.UploadField:
                    path = value.ToString();
                    break;
                case Constants.PropertyEditors.Aliases.ImageCropper:
                    //get the url from the json format
                    path = value is ImageCropperValue stronglyTyped ? stronglyTyped.Src : value.ToString();
                    break;
            }

            var url = AssembleUrl(path, current);
            return url == null ? null : UrlInfo.Url(url.ToString(), culture);
        }

        private Uri AssembleUrl(string path, Uri current)
        {
            var mode = UrlMode.Auto;

            if (string.IsNullOrEmpty(path))
            {
                return null;
            }

            // the stored path is absolute so we just return it as is
            if (Uri.IsWellFormedUriString(path, UriKind.Absolute))
            {
                return new Uri(path);
            }

            Uri uri;

            if (current == null)
            {
                mode = UrlMode.Relative; // best we can do
            }

            switch (mode)
            {
                case UrlMode.Absolute:
                    uri = new Uri(current?.GetLeftPart(UriPartial.Authority) + path);
                    break;
                case UrlMode.Relative:
                    uri = new Uri(path, UriKind.Relative);
                    break;
                case UrlMode.Auto:
                    var cdnUrl = ConfigurationManager.AppSettings["CmsCdnUrl"];
                    uri = !string.IsNullOrWhiteSpace(cdnUrl)
                        ? new Uri(cdnUrl + path)
                        : new Uri(current?.GetLeftPart(UriPartial.Authority) + path);
                    break;
                default:
                    throw new ArgumentOutOfRangeException(nameof(mode));
            }

            return UriUtility.MediaUriFromUmbraco(uri);
        }
    }