Limit number of relays to publish zap receipts to

app/models/setting.rb

@@ -169,6 +169,9 @@ class Setting < RailsSettings::Base
   field :nostr_public_key, type: :string,
     default: ENV["NOSTR_PUBLIC_KEY"].presence
 
+  field :nostr_zaps_relay_limit, type: :integer,
+    default: 12
+
   #
   # OpenCollective
   #

app/services/nostr_manager/publish_zap_receipt.rb

@@ -7,8 +7,7 @@ module NostrManager
     def call
       tags = parse_tags(@zap.request_event.tags)
 
-      # TODO limit to 15 or so relays
-      tags[:relays].each do |relay_url|
+      tags[:relays].take(Setting.nostr_zaps_relay_limit).each do |relay_url|
         if @delayed
           NostrPublishEventJob.perform_later(event: @zap.receipt, relay: relay_url)
         else

app/views/admin/settings/services/_nostr.html.erb

@@ -19,5 +19,15 @@
         title: "Public key",
         description: "The corresponding public key of the accounts service"
       ) %>
-<% end %>
 </ul>
+</section>
+<section>
+<h3>Zaps</h3>
+<ul role="list">
+  <%= render FormElements::FieldsetResettableSettingComponent.new(
+        key: :nostr_zaps_relay_limit,
+        title: "Relay limit",
+        description: "The maximum number of relays to publish zap receipts to"
+      ) %>
+</ul>
+<% end %>