public async Task <ActionResult> ShortenURL(string originalUrl)
{
if (string.IsNullOrEmpty(originalUrl))
{
return(Json(new { status = false, message = "Please provide URL." }));
}
else
{
if (!UrlRepository.HasHTTPProtocol(originalUrl))
{
originalUrl = "http://" + originalUrl;
}
// check whether the URL entered exists
if (!await UrlRepository.IsExistOriginalUrl(originalUrl))
{
return(Json(new { status = false, message = "Could not reach the URL. Please ensure you have enter a valid URL." }));
}
// Check if original URL already exists in the database
Url existingURL = repository.Urls.Where(u => u.OriginalUrl.Equals(originalUrl, StringComparison.OrdinalIgnoreCase)).FirstOrDefault();
string urlPrefix = Request.Scheme + "://" + Request.Host + "/";
if (existingURL == null)
{
// Check if original URL is existing shorten URL
Url processedURL = repository.Urls
.Where(u => (urlPrefix + u.ShortUrl).Equals(originalUrl, StringComparison.OrdinalIgnoreCase))
.FirstOrDefault();
if (processedURL == null)
{
Url newUrl = new Url()
{
OriginalUrl = originalUrl,
GeneratedDate = DateTime.UtcNow
};
string randomUrl = "";
do // make sure the random short URL does not exist in db
{
randomUrl = UrlRepository.GenerateRandomShortUrl(appSettings.UrlLength);
} while (repository.Urls.Where(u => u.ShortUrl.Equals(randomUrl, StringComparison.OrdinalIgnoreCase)).Count() > 0);
newUrl.ShortUrl = randomUrl;
try
{
repository.SaveUrl(newUrl);
newUrl.ShortUrl = urlPrefix + newUrl.ShortUrl;
return(Json(new { status = true, url = newUrl }));
}
catch (Exception exc)
{
return(Json(new { status = false, message = exc.Message }));
}
}
else
{
processedURL.ShortUrl = originalUrl;
return(Json(new { status = true, url = processedURL }));
}
}
else
{
existingURL.ShortUrl = urlPrefix + existingURL.ShortUrl;
return(Json(new { status = true, url = existingURL }));
}
}
}