public static UrlModel From(UrlMap urlMap)
{
if (urlMap == null) return new UrlModel();
return new UrlModel
{
OriginalUrl = urlMap.OriginalUrl,
ShortUrl = urlMap.ShortUrl,
ShortUrlCode = urlMap.ShortUrlCode,
IsActive = urlMap.IsActive,
Clicks=urlMap.Clicks,
DateCreated = urlMap.DateCreated
};
}
public void AddUrlMap(UrlMap url, String userName = null)
{
url.UserName = userName;
_UrlRepository.Add(url);
}
public void RemoveUrlMap(UrlMap url, String userName = null)
{
_UrlRepository.Delete(url);
}
public void UpdateMap(UrlMap url)
{
_UrlRepository.Update(url);
}
public ActionResult Generate(String longurl)
{
var jsonResp = new UrlShortenResponse{
Success = true
};
/*
* +--------------------------------------------------------------------------------+
* | Step 1: Check if the URL is valid. We will issue a web request and see the |
* | status code. |
* | Step 2: Check if this URL is already in the system. If exists, return |
* | We will check for the current user, since we will generate a unique |
* | URL for each user for a given original URL |
* | Step 3: Generate short URL. (May be check again if we generated a duplicate?) |
* | Step 4: Generate a QR code for the URL |
* | Step 5: Save generated short url and also save the QR image. |
* | Step 6: Send Json response back to the user. |
* +--------------------------------------------------------------------------------+
*/
#region Step 1 - Check for a valid URL
bool bValidUrl = true;
try
{
HttpWebRequest request = WebRequest.Create(longurl) as HttpWebRequest;
request.Method = "GET";
request.CachePolicy = new RequestCachePolicy(RequestCacheLevel.NoCacheNoStore);
var response = request.GetResponse();
bValidUrl = response.Headers.Count > 0;
}
catch
{
bValidUrl = false;
}
if (!bValidUrl)
{
return Json(new UrlShortenResponse
{
Success = false,
Message = "Please check if the URL is correct and try again."
}, "text/html");
}
String protoPrefix = "http://";
String webUrl = longurl;
if (longurl.Contains("://"))
{
int iIndex = longurl.IndexOf("://");
protoPrefix = longurl.Substring(0, iIndex + 3);
webUrl = longurl.Substring(iIndex + 3);
}
#endregion
#region Step 2-5 - Generate URL and save
UrlMap url = _UrlMapDataSource.FindSingleUrlByUserName(longurl, User.Identity.Name);
if (url == null)
{
url = new UrlMap();
url.OriginalUrl = longurl;
url.DateCreated = DateTime.UtcNow;
url.IsActive = true;
//Step 3:
//Now generate hash for the longUrl;
uint hash = FNVHash.fnv_32a_str(webUrl + User.Identity.Name);
//Convert hash to base36
url.ShortUrlCode = Base36Converter.Encode(hash);
url.ShortUrl = String.Format("{0}{1}", _URLShortenerHost, url.ShortUrlCode);
//Step 4:
QrEncoder qrEncoder = new QrEncoder(ErrorCorrectionLevel.H);
QrCode qrCode = new QrCode();
qrEncoder.TryEncode(url.ShortUrl, out qrCode);
Renderer renderer = new Renderer(5, Brushes.Black, Brushes.White);
String fileName = String.Format("{0}{1}.qr", AppDomain.CurrentDomain.BaseDirectory, url.ShortUrlCode);
renderer.CreateImageFile(qrCode.Matrix, fileName, ImageFormat.Png);
jsonResp.QRCodeUrl = String.Format("{0}Home/QRImage/{1}.qr", _URLShortenerHost, url.ShortUrlCode);
//Save Url Map
_UrlMapDataSource.AddUrlMap(url, User.Identity.Name);
//Save method appends the .qr extension
_UrlMapDataSource.SaveQRCode(fileName, url.ShortUrlCode);
}
#endregion
// Step 6
jsonResp.Url = url.ShortUrl;
jsonResp.QRCodeUrl = String.Format("{0}Home/QRImage/{1}.qr", _URLShortenerHost, url.ShortUrlCode);
return Json(jsonResp, "text/html");
}
