public static string GetSrcSet(
string url,
IEnumerable <ImageSizeParameters> srcSet,
ImageSizeParameters imageParams = null)
{
var srcSetParameters = srcSet.Select(parameters =>
{
var newParams = new ImageSizeParameters(imageParams)
{
W = parameters.W,
H = parameters.H,
Mw = parameters.Mw,
Mh = parameters.Mh,
Iar = parameters.Iar,
As = parameters.As,
Sc = parameters.Sc
};
var imageWidth = newParams.W ?? newParams.Mw;
if (imageWidth == null)
{
return(null);
}
return($"{UpdateImageUrl(url, newParams)} {imageWidth}w");
}).Where(p => p != null);
return(string.Join(", ", srcSetParameters));
}
public static string UpdateImageUrl(
string url,
ImageSizeParameters parameters = null)
{
var parsedUrl = new Uri(url, UriKind.RelativeOrAbsolute);
var uriBuilder = parsedUrl.IsAbsoluteUri ?
new UriBuilder(parsedUrl) :
new UriBuilder("http://www.tempuri.org" + parsedUrl);
var imageParameters = parameters?.ToString();
if (!string.IsNullOrWhiteSpace(imageParameters))
{
uriBuilder.Query = imageParameters;
}
var match = MediaUrlPrefixRegex.Match(uriBuilder.Path);
if (match.Length > 1)
{
// regex will provide us with /-/ or /~/ type
uriBuilder.Path = MediaUrlPrefixRegex.Replace(uriBuilder.Path, $"/{match.Groups[1].Value}/jssmedia/");
}
return(parsedUrl.IsAbsoluteUri ?
uriBuilder.Uri.GetComponents(UriComponents.AbsoluteUri, UriFormat.SafeUnescaped) :
uriBuilder.Uri.GetComponents(UriComponents.PathAndQuery, UriFormat.SafeUnescaped));
}
