Added filename source decoding

1 files changed, 20 insertions, 0 deletions

diff --git a/Services/SourceService.cs b/Services/SourceService.cs
new file mode 100644
index 0000000..d145346
--- /dev/null
+++ b/Services/SourceService.cs
@@ -0,0 +1,20 @@
+using System.Text.RegularExpressions;
+
+namespace HyperBooru.Services;
+
+public interface ISourceService {
+    public string? GetUrlFromFilename(string filename);
+}
+
+public class SourceService : ISourceService {
+    private Regex PixivRegex =
+        new(@"^([0-9]+)_p[0-9]+(_master1200)?\.[^.]+$", RegexOptions.Compiled);
+
+    public string? GetUrlFromFilename(string filename) {
+        var pixivMatch = PixivRegex.Match(filename);
+        if(pixivMatch.Success)
+            return $"https://pixiv.net/en/artworks/{pixivMatch.Groups[1].Value}";
+
+        return null;
+    }
+}