public IActionResult LinkShortener(string longURL = null)
{
string shortURL = longURL;
ViewData["Title"] = "Link Shortener";
//If string from post was null, then this field isn't displayed
if (longURL != null)
{
//Randomly choose and int... This will actually be the PK value in the DB
Random rnd = new Random();
int value = rnd.Next(0, 100);
//Algorithm for shortended link
string encoding = Shortener.GetShortEncoding(value);
int decoding = Shortener.GetLongDecoding(encoding);
string urlHost = Request.Host.ToString();
shortURL = urlHost + "/Home/Go/" + encoding;
}
ViewData["shortURL"] = shortURL;
return(View());
}
//Defualt action of home controller is linkshortener rather than index (changed in route config)
//Action takes an optional parameter (longURL) - The url to be shortened
public ActionResult LinkShortener(string longURL = null)
{
//Save the short url as the long url (currently)
string shortURL = longURL;
//Add the current title to the view bag (for display in the tab on a web broswer)
ViewBag.Title = "Link Shortener";
//If string from post was null, then this if statement is never entered
if (longURL != null)
{
//Get the DB instance (and if necessary the DB itself)
var dbInstance = LinkDatabase.getInstance();
dbInstance.createDB();
//Save the longurl in the db and save the return as primary key
string pk = dbInstance.saveLongURL(longURL);
//Encode the PK
string encoding = Shortener.GetShortEncoding(Int32.Parse(pk));
//Get the host and port parts of our website url
string urlHost = HttpContext.Request.Url.Host;
int urlPort = HttpContext.Request.Url.Port;
//If no port, ignore adding it to the shortened url
if (urlPort == 80)
{
//Short url looks like: <website name>:<port>/Home/Go/<encoded pk>
shortURL = urlHost + "/Home/Go/" + encoding;
}
else
{
//Short url looks like: <website name>/Home/Go/<encoded pk>
shortURL = urlHost + ":" + urlPort.ToString() + "/Home/Go/" + encoding;
}
}
//Return the shortened (or null) short url to the view
ViewBag.shortURL = shortURL;
//Render the view
return(View());
}