Support onchain for prism

Plugins/BTCPayServer.Plugins.Prism/LNURLPrismClaimCreate.cs

@@ -0,0 +1,49 @@
+using System;
+using System.Threading.Tasks;
+using BTCPayServer.Abstractions.Contracts;
+using BTCPayServer.Data.Payouts.LightningLike;
+using BTCPayServer.HostedServices;
+
+namespace BTCPayServer.Plugins.Prism;
+
+public class LNURLPrismClaimCreate : IPluginHookFilter
+{
+    private readonly BTCPayNetworkProvider _networkProvider;
+    public string Hook => "prism-claim-create";
+
+    public LNURLPrismClaimCreate(BTCPayNetworkProvider networkProvider)
+    {
+        _networkProvider = networkProvider;
+    }
+    public async Task<object> Execute(object args)
+    {
+        var network = _networkProvider.GetNetwork<BTCPayNetwork>("BTC");
+        if (args is not ClaimRequest claimRequest || network is null)
+        {
+            return args;
+        }
+        
+        if (claimRequest.Destination?.ToString() is not { } potentialLnurl) return args;
+       
+        try
+        {
+            LNURL.LNURL.ExtractUriFromInternetIdentifier(potentialLnurl);
+            claimRequest.Destination = new LNURLPayClaimDestinaton(potentialLnurl);
+            return claimRequest;
+        }
+        catch (Exception e)
+        {
+            try
+            {
+                LNURL.LNURL.Parse(potentialLnurl, out _);
+                claimRequest.Destination = new LNURLPayClaimDestinaton(potentialLnurl);
+                return claimRequest;
+            }
+            catch (Exception)
+            {
+            }
+        }
+
+        return args;
+    }
+}