public static Response HandleShortenUrl(HttpContext context, string requestedUrl)
{
var response = new Response();
// Perform basic validation
if (String.IsNullOrEmpty(requestedUrl))
{
response.isError = true;
response.errorMessage = "Url cannot be empty";
return(response);
}
// Test our URL
if (!Uri.TryCreate(requestedUrl, UriKind.Absolute, out Uri result))
{
response.isError = true;
response.errorMessage = "Could not understand URL.";
return(response);
}
var url = result.ToString();
// Ask for LiteDB and persist a short link
var db = context.RequestServices.GetService(typeof(ILiteDatabase)) as ILiteDatabase;
var links = db.GetCollection <ShortLink>(BsonAutoId.Int32);
// Temporary short link
var entry = new ShortLink
{
Url = url
};
// Insert our short-link
links.Insert(entry);
var urlChunk = entry.GetUrlChunk();
var responseUri = $"{context.Request.Scheme}://{context.Request.Host}/test/{urlChunk}";
response.isError = false;
response.shortenUrl = responseUri;
return(response);
}
public static Task HandleRedirect(HttpContext context)
{
var db = context.RequestServices.GetService(typeof(ILiteDatabase)) as ILiteDatabase;
var collection = db.GetCollection <ShortLink>(BsonAutoId.Int32);
var path = context.Request.Path.ToUriComponent().Replace("/test", "").Trim('/');
var id = ShortLink.GetId(path);
var entry = collection.Find(p => p.Id == id).FirstOrDefault();
if (entry != null)
{
context.Response.Redirect(entry.Url);
}
else
{
context.Response.Redirect("/");
}
return(Task.CompletedTask);
}