public async Task <bool> IsValidLinkAsync(string link)
{
var match = linkValidationExpression.Match(link);
if (!match.Success)
{
return(false);
}
var domain = match.Groups[1].Value;
return(linkValidationExpression.IsMatch(link) &&
await domainNameResolver.IsValidDomainAsync(domain));
}
public async Task <bool> IsValidLinkAsync(string link)
{
if (link.Length > 1024)
{
return(false);
}
if (link.StartsWith("."))
{
return(false);
}
if (link.Count(x => x == '.') == 0)
{
return(false);
}
if (link.Contains(".."))
{
return(false);
}
var domain = link;
if (domain.StartsWith("http://"))
{
domain = domain.Substring("http://".Length);
}
if (domain.StartsWith("https://"))
{
domain = domain.Substring("https://".Length);
}
var pathOrQueryIndex = domain.IndexOfAny(new[] { '?', '&', '/' });
if (pathOrQueryIndex != -1)
{
domain = domain.Substring(0, pathOrQueryIndex);
}
return(await domainNameResolver.IsValidDomainAsync(domain));
}
