/// <summary>
/// Sanitizes a URL.
/// </summary>
/// <param name="url">The URL.</param>
/// <param name="baseUrl">The base URL relative URLs are resolved against (empty or null for no resolution).</param>
/// <returns>The sanitized URL or null if no safe URL can be created.</returns>
protected virtual string SanitizeUrl(string url, string baseUrl)
{
var iri = GetSafeIri(url);
if (iri != null && !iri.IsAbsolute && !string.IsNullOrEmpty(baseUrl))
{
// resolve relative uri
if (Uri.TryCreate(baseUrl, UriKind.Absolute, out Uri baseUri))
{
try
{
return(new Uri(baseUri, iri.Value).AbsoluteUri);
}
catch (UriFormatException)
{
iri = null;
}
}
else
{
iri = null;
}
}
var e = new FilterUrlEventArgs {
OriginalUrl = url, SanitizedUrl = iri?.Value
};
OnFilteringUrl(e);
return(e.SanitizedUrl);
}
/// <summary>
/// Raises the <see cref="E:RemovingUrl" /> event.
/// </summary>
/// <param name="e">The <see cref="FilterUrlEventArgs"/> instance containing the event data.</param>
protected virtual void OnFilteringUrl(FilterUrlEventArgs e)
{
FilterUrl?.Invoke(this, e);
}