public async Task<IValidationContext> UrlValid(string url)
{
string text = url;
return await Task.Run(() =>
{
ValidationContext context = new ValidationContext();
if (string.IsNullOrEmpty(text))
{
context.ErrorMessages.Add("Please enter a URL.");
text = string.Empty;
}
//load url with parsed model url for further testing.
text = HttpUtility.HtmlEncode(text.Trim());
//Max supported length of IE: https://support.microsoft.com/en-us/kb/208427 (Other browsers support more however, this targets the most restrictive.)
if (text.Length > 2048) context.ErrorMessages.Add("Please ensure URL is less than 2048 characters.");
if (!Regex.IsMatch(text,
@"^(?:http|https|ftp)://[a-zA-Z0-9\.\-]+(?:\:\d{1,5})?(?:[\\_\-\#\*\(\)A-Za-z0-9\.\;\:\@\&\=\+\$\,\?/]|%u[0-9A-Fa-f]{4}|%[0-9A-Fa-f]{2})*$")) context.ErrorMessages.Add("Please enter a valid URL.");
if (context.ErrorMessages.Count == 0) context.IsValid = true;
return context;
});
}
public async Task<IValidationContext> ShortUrlValid(IHomeModel model)
{
string text = model.Url;
return await Task.Run(() =>
{
ValidationContext context = new ValidationContext();
if (string.IsNullOrEmpty(text))
{
context.ErrorMessages.Add("Please enter a URL.");
text = string.Empty;
}
//load url with parsed model url for further testing.
text = HttpUtility.HtmlEncode(text.Trim());
if (!Regex.IsMatch(text, String.Format("(http://)({0})(/)(\\w*)(?!\\W)$", model.Host))) context.ErrorMessages.Add("Please enter a valid URL.");
if (context.ErrorMessages.Count == 0) context.IsValid = true;
return context;
});
}