Config for separate primary domain Nostr pubkey

Allow to configure a separate key for the NIP-05 address of the primary
domain vs the accounts domain.

app/controllers/well_known_controller.rb

@@ -10,8 +10,14 @@ class WellKnownController < ApplicationController
     relay_url = Setting.nostr_relay_url.presence
 
     if params[:name] == "_"
-      # pubkey for the primary domain without a username (e.g. kosmos.org)
-      res = { names: { "_": Setting.nostr_public_key } }
+      if domain == Setting.primary_domain
+        # pubkey for the primary domain without a username (e.g. kosmos.org)
+        res = { names: { "_": Setting.nostr_public_key_primary_domain || Setting.nostr_public_key } }
+      else
+        # pubkey for the akkounts domain without a username (e.g. accounts.kosmos.org)
+        res = { names: { "_": Setting.nostr_public_key } }
+      end
+
       res[:relays] = { "_" => [ relay_url ] } if relay_url
     else
       @user = User.where(cn: params[:name], ou: domain).first

app/models/concerns/settings/nostr_settings.rb

@@ -12,6 +12,9 @@ module Settings
       field :nostr_public_key, type: :string,
         default: ENV["NOSTR_PUBLIC_KEY"].presence
 
+      field :nostr_public_key_primary_domain, type: :string,
+        default: nil
+
       field :nostr_relay_url, type: :string,
         default: ENV["NOSTR_RELAY_URL"].presence
 

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

@@ -19,6 +19,11 @@
         title: "Public key",
         description: "The corresponding public key of the accounts service"
       ) %>
+  <%= render FormElements::FieldsetResettableSettingComponent.new(
+        key: :nostr_public_key_primary_domain,
+        title: "Public key for primary domain (NIP-05)",
+        description: "(optional) A different pubkey to announce for the _@#{Setting.primary_domain} Nostr address"
+      ) %>
   <%= render FormElements::FieldsetResettableSettingComponent.new(
         key: :nostr_relay_url,
         title: "Relay URL",