adding spotify integration

Kasbot.APP/Services/Internal/UrlResolver.cs

@@ -0,0 +1,93 @@
+using System.Web;
+
+namespace Kasbot.App.Services.Internal
+{
+    public static class UrlResolver
+    {
+        private const string SpotifyUrl = "open.spotify.com";
+
+        public static SearchType GetSearchType(string query)
+        {
+            if (string.IsNullOrEmpty(query))
+                return SearchType.None;
+
+            if (IsURL(query))
+            {
+                if (IsSpotifyUrl(query))
+                {
+                    if (query.Contains("/track/"))
+                        return SearchType.SpotifyTrack;
+
+                    if (query.Contains("/album/"))
+                        return SearchType.SpotifyAlbum;
+
+                    if (query.Contains("/playlist/"))
+                        return SearchType.SpotifyPlaylist;
+
+                    if (query.Contains("/artist/"))
+                        return SearchType.SpotifyArtist;
+                }
+
+                if (query.Contains("playlist?list="))
+                    return SearchType.YoutubePlaylist;
+
+                if (query.Contains("list="))
+                    return SearchType.VideoPlaylistURL;
+
+                return SearchType.VideoURL;
+            }
+
+            return SearchType.StringSearch;
+        }
+
+        public static string GetVideoId(string url)
+        {
+            if (url.Contains("v="))
+            {
+                var uri = new Uri(url);
+                var query = HttpUtility.ParseQueryString(uri.Query);
+                return query["v"] ?? string.Empty;
+            }
+
+            if (url.Contains("youtu.be/"))
+            {
+                var uri = new Uri(url);
+                return uri.Segments[1];
+            }
+
+            return url;
+        }
+
+        public static string GetSpotifyResourceId(string url)
+        {
+            if (string.IsNullOrEmpty(url))
+                return string.Empty;
+
+            var uri = new Uri(url);
+            return uri.Segments[uri.Segments.Length - 1];
+        }
+
+        private static bool IsURL(string url)
+        {
+            return url.StartsWith("http://") || url.StartsWith("https://");
+        }
+
+        private static bool IsSpotifyUrl(string url)
+        {
+            return url.Contains(SpotifyUrl);
+        }
+    }
+
+    public enum SearchType
+    {
+        None,
+        StringSearch,
+        VideoURL,
+        VideoPlaylistURL,
+        YoutubePlaylist,
+        SpotifyTrack,
+        SpotifyAlbum,
+        SpotifyPlaylist,
+        SpotifyArtist
+    }
+}