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Plugins/BTCPayServer.Plugins.NIP05/LnurlFilter.cs

@@ -0,0 +1,45 @@
+using System.Linq;
+using System.Threading.Tasks;
+using BTCPayServer.Abstractions.Services;
+using LNURL;
+
+namespace BTCPayServer.Plugins.NIP05;
+
+public class LnurlFilter : PluginHookFilter<LNURLPayRequest>
+{
+    private readonly Nip5Controller _nip5Controller;
+    private readonly LightningAddressService _lightningAddressService;
+    public override string Hook => "modify-lnurlp-request";
+
+    public LnurlFilter(Nip5Controller nip5Controller, LightningAddressService lightningAddressService)
+    {
+        _nip5Controller = nip5Controller;
+        _lightningAddressService = lightningAddressService;
+    }
+
+    public override async Task<LNURLPayRequest> Execute(LNURLPayRequest arg)
+    {
+        var name = arg.ParsedMetadata.FirstOrDefault(pair => pair.Key == "text/identifier").Value
+            ?.ToLowerInvariant().Split("@")[0];
+        if (string.IsNullOrEmpty(name))
+        {
+            return arg;
+        }
+
+        var lnAddress = await _lightningAddressService.ResolveByAddress(name);
+        if (lnAddress is null)
+        {
+            return arg;
+        }
+
+        var nip5 = await _nip5Controller.Get(name);
+        if (nip5.storeId != lnAddress.StoreDataId)
+        {
+            return arg;
+        }
+
+        arg.NostrPubkey = nip5.settings.PubKey;
+        arg.AllowsNostr = true;
+        return arg;
+    }
+}