public static MvcHtmlString GetAlternateLinks(this ContentReference contentReference)
{
if (!ProcessRequest)
{
return(MvcHtmlString.Create(""));
}
var alternates = new List <AlternativePageLink>();
var languages = ServiceLocator.Current.GetInstance <ILanguageBranchRepository>().ListEnabled();
GetAlternativePageLink(contentReference, languages, alternates);
var masterLanguage = languages.FirstOrDefault(l => l.ID == 1) ?? languages.FirstOrDefault();
var xDefault =
alternates.FirstOrDefault(a => string.Equals(a.Culture.ToLower(), masterLanguage?.LanguageID.ToLower()));
var siteLanguageList = languages.Select(language => language.LanguageID).ToList();
#region For fallback language page links
foreach (var link in alternates)
{
if (siteLanguageList.Contains(link.Culture))
{
siteLanguageList.Remove(link.Culture);
}
}
foreach (var language in siteLanguageList)
{
if (xDefault != null && language != null)
{
var fallbackLanguages =
ContentLanguageSettingsHandler.Instance.GetFallbackLanguages(contentReference, language);
if (fallbackLanguages.Any() && fallbackLanguages.Contains(masterLanguage?.LanguageID))
{
var url = xDefault.Url.Replace("/" + masterLanguage?.LanguageID.ToLower() + "/",
"/" + language + "/");
var alternate = new AlternativePageLink(url, language);
alternates.Add(alternate);
}
}
}
#endregion
var model = new AlternativeLinkViewModel(alternates);
if (!string.IsNullOrEmpty(xDefault?.Url))
{
model.XDefaultUrl = xDefault.Url;
}
var htmlString = CreateHtmlString(model);
return(htmlString);
}
private static MvcHtmlString CreateHtmlString(AlternativeLinkViewModel model)
{
var sb = new StringBuilder();
foreach (var alternate in model.Alternates)
{
sb.AppendLine("<link rel=\"alternate\" href=\"" + alternate.Url + "\" hreflang=\"" + alternate.Culture.ToLower() +
"\" />");
}
if (!string.IsNullOrEmpty(model.XDefaultUrl))
{
sb.AppendLine(" <link rel=\"alternate\" href=\"" + model.XDefaultUrl + "\" hreflang=\"x-default\" />");
}
return(MvcHtmlString.Create(sb.ToString()));
}
