feat: basic initial implementation of spotify client link validator and song submission form refs: NOISSUE

song_of_the_day/SongValidators/ISongValidator.cs

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+public interface ISongValidator
+{
+    Task<Song> ValidateAsync(Uri songUri);
+
+    bool CanValidateUri(Uri songUri);
+
+    Task<bool> CanExtractSongMetadataAsync(Uri songUri);
+}

song_of_the_day/SongValidators/SongResolver.cs

@@ -0,0 +1,66 @@
+using Microsoft.Extensions.Logging;
+
+public class SongResolver
+{
+    private readonly IEnumerable<ISongValidator> _songValidators;
+
+    private readonly ILogger logger;
+
+    public SongResolver()
+    {
+        using ILoggerFactory factory = LoggerFactory.Create(builder => builder.AddConsole().SetMinimumLevel(LogLevel.Information));
+        this.logger = factory.CreateLogger("SongResolver");
+        
+        this._songValidators = new List<ISongValidator>();
+
+        foreach (Type mytype in System.Reflection.Assembly.GetExecutingAssembly().GetTypes()
+                 .Where(mytype => mytype.GetInterfaces().Contains(typeof(ISongValidator)) && !(mytype.Name.EndsWith("Base")))) {
+            if (Activator.CreateInstance(mytype) is ISongValidator validator)
+            {
+                logger.LogDebug("Registering song validator: {ValidatorType}", mytype.Name);
+                this._songValidators = this._songValidators.Append(validator);
+            }
+        }
+    }
+
+    public async Task<Song> ResolveSongAsync(Uri songUri)
+    {
+        foreach (var validator in _songValidators)
+        {
+            if (validator.CanValidateUri(songUri))
+            {
+                if (!await validator.CanExtractSongMetadataAsync(songUri))
+                {
+                    this.logger.LogWarning("Cannot extract metadata for song URI: {SongUri}", songUri);
+                    return new Song {
+                                    Artist = "Unknown Artist",
+                                    Name = "Unknown Title",
+                                    Url = songUri.ToString(),
+                                    Provider = SongProvider.PlainHttp,
+                                };
+                }
+                return await validator.ValidateAsync(songUri);
+            }
+        }
+
+        return new Song {
+                        Artist = "Unknown Artist",
+                        Name = "Unknown Title",
+                        Url = songUri.ToString(),
+                        Provider = SongProvider.PlainHttp,
+                    };
+    }
+
+    public bool CanValidate(Uri songUri)
+    {
+        foreach (var validator in _songValidators)
+        {
+            if (validator.CanValidateUri(songUri))
+            {
+                return true;
+            }
+        }
+
+        return false;
+    }
+}

song_of_the_day/SongValidators/SongValidatorBase.cs

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+using System.Text.RegularExpressions;
+
+public abstract class SongValidatorBase : ISongValidator
+{
+    public abstract Task<Song> ValidateAsync(Uri songUri);
+
+    public abstract Task<bool> CanExtractSongMetadataAsync(Uri songUri);
+
+    public abstract bool CanValidateUri(Uri songUri);
+
+    protected string LookupSpotifyId(string songName, string songArtist)
+    {
+        // TODO: Implement Spotify ID lookup logic
+        return songName + " by " + songArtist;
+    }
+}

song_of_the_day/SongValidators/SpotifyValidator.cs

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+using System.Text.RegularExpressions;
+using AngleSharp;
+using AngleSharp.Dom;
+using AngleSharp.Html.Dom;
+
+public class SpotifyValidator : UriBasedSongValidatorBase
+{
+    public override string UriValidatorRegex => @"^(https?://)?open.spotify.com/track/([a-zA-Z0-9_-]{22})(\?si=[a-zA-Z0-9_-]+)?$";
+
+    private SpotifyApiClient spotifyApiClient;
+
+    public SpotifyValidator()
+    {
+        spotifyApiClient = new SpotifyApiClient();
+    }
+
+    public override async Task<bool> CanExtractSongMetadataAsync(Uri songUri)
+    {
+        return this.CanValidateUri(songUri);
+    }
+
+    public override async Task<Song> ValidateAsync(Uri songUri)
+    {
+        var regexp = new Regex(UriValidatorRegex, RegexOptions.IgnoreCase);
+        var trackIdMatch = regexp.Match(songUri.ToString()).Groups[2].Value;
+
+        var track = await spotifyApiClient.GetTrackByIdAsync(trackIdMatch);
+        
+        var song = new Song
+        {
+            Name = track.Name,
+            Artist = track.Artists.FirstOrDefault()?.Name ?? "Unknown Artist",
+            Url = songUri.ToString(),
+            Provider = SongProvider.Spotify,
+            SpotifyId = trackIdMatch
+        };
+
+        return song;
+    }
+}

song_of_the_day/SongValidators/UriBasedSongValidatorBase.cs

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+using System.Text.RegularExpressions;
+
+public abstract class UriBasedSongValidatorBase : SongValidatorBase
+{
+    public abstract string UriValidatorRegex { get; }
+
+    public override bool CanValidateUri(Uri songUri)
+    {
+        var regexp = new Regex(UriValidatorRegex, RegexOptions.IgnoreCase);
+        return regexp.Match(songUri.ToString()).Success;
+    }
+}

song_of_the_day/SongValidators/YoutubeMusicValidator.cs

@@ -0,0 +1,43 @@
+using AngleSharp;
+using AngleSharp.Dom;
+
+public class YoutubeMusicValidator : UriBasedSongValidatorBase
+{
+    public override string UriValidatorRegex => @"^(https?://)?(music\.youtube\.com/watch\?v=|youtu\.be/)([a-zA-Z0-9_-]{11})";
+
+    public override async Task<bool> CanExtractSongMetadataAsync(Uri songUri)
+    {
+        return this.CanValidateUri(songUri);
+    }
+
+    public override async Task<Song> ValidateAsync(Uri songUri)
+    {
+        var title = string.Empty;
+        var artist = string.Empty;
+
+        using(HttpClient httpClient = new HttpClient())
+        {
+            var response = await httpClient.GetAsync(songUri);
+            var config = Configuration.Default.WithDefaultLoader();
+            var context = BrowsingContext.New(config);
+            using(var document = await context.OpenAsync(async req => req.Content(await response.Content.ReadAsStringAsync())))
+            {
+                // document.getElementsByTagName("ytmusic-player-queue-item")[0].getElementsByClassName("song-title")[0].innerHTML
+                title = document.QuerySelector(".ytmusic-player-queue-item")?.QuerySelector(".song-title")?.InnerHtml;
+                // document.getElementsByTagName("ytmusic-player-queue-item")[0].getElementsByClassName("byline")[0].innerHTML
+                artist = document.QuerySelector(".ytmusic-player-queue-item")?.QuerySelector(".byline")?.InnerHtml;
+            }
+        }
+        
+        var song = new Song
+        {
+            Name = title,
+            Artist = artist,
+            Url = songUri.ToString(),
+            Provider = SongProvider.YouTube,
+            SpotifyId = this.LookupSpotifyId(title, artist)
+        };
+
+        return song;
+    }
+}

song_of_the_day/SongValidators/YoutubeValidator.cs

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+using AngleSharp;
+using AngleSharp.Dom;
+using AngleSharp.Html.Dom;
+
+public class YoutubeValidator : UriBasedSongValidatorBase
+{
+    public override string UriValidatorRegex => @"^(https?://)?(www\.)?(youtube\.com/watch\?v=|youtu\.be/)([a-zA-Z0-9_-]{11})";
+
+    public override async Task<bool> CanExtractSongMetadataAsync(Uri songUri)
+    {
+        using(HttpClient httpClient = new HttpClient())
+        {
+            var response = await httpClient.GetAsync(songUri);
+            var config = Configuration.Default.WithDefaultLoader();
+            var context = BrowsingContext.New(config);
+            using(var document = await context.OpenAsync(async req => req.Content(await response.Content.ReadAsStringAsync())))
+            {
+                var documentContents = (document.ChildNodes[1] as HtmlElement).InnerHtml;
+                var titleElement = document.QuerySelectorAll(".yt-video-attribute-view-model__title")[0];
+                var artistParentElement = document.QuerySelectorAll(".yt-video-attribute-view-model__secondary-subtitle")[0];
+
+                return titleElement != null && artistParentElement != null && artistParentElement.Children.Length > 0;
+            }
+        }
+    }
+
+    public override async Task<Song> ValidateAsync(Uri songUri)
+    {
+        var title = string.Empty;
+        var artist = string.Empty;
+
+        using(HttpClient httpClient = new HttpClient())
+        {
+            var response = await httpClient.GetAsync(songUri);
+            var config = Configuration.Default.WithDefaultLoader();
+            var context = BrowsingContext.New(config);
+            using(var document = await context.OpenAsync(async req => req.Content(await response.Content.ReadAsStringAsync())))
+            {
+                title = document.QuerySelectorAll(".yt-video-attribute-view-model__title")[0]?.InnerHtml;
+                artist = document.QuerySelectorAll(".yt-video-attribute-view-model__secondary-subtitle")[0]?.Children[0]?.InnerHtml;
+            }
+        }
+        
+        var song = new Song
+        {
+            Name = title,
+            Artist = artist,
+            Url = songUri.ToString(),
+            Provider = SongProvider.YouTube,
+            SpotifyId = this.LookupSpotifyId(title, artist)
+        };
+
+        return song;
+    }
+}