Publish zap receipts to own relay in addition to requested ones

.env.example

@@ -29,6 +29,7 @@
 
 #
 # Service Integrations
+# (sorted alphabetically by service name)
 #
 
 # BTCPAY_PUBLIC_URL='https://btcpay.example.com'
@@ -62,5 +63,9 @@
 
 # MEDIAWIKI_PUBLIC_URL='https://wiki.kosmos.org'
 
+# NOSTR_PRIVATE_KEY='123456abcdef...'
+# NOSTR_PUBLIC_KEY='123456abcdef...'
+# NOSTR_RELAY_URL='wss://nostr.kosmos.org'
+
 # RS_STORAGE_URL='https://storage.kosmos.org'
 # RS_REDIS_URL='redis://localhost:6379/2'

app/controllers/well_known_controller.rb

@@ -5,11 +5,19 @@ class WellKnownController < ApplicationController
     @user = User.where(cn: params[:name], ou: domain).first
     http_status :not_found and return if @user.nil? || @user.nostr_pubkey.blank?
 
+    res = {
+      names: { "#{@user.cn}": @user.nostr_pubkey }
+    }
+
+    if Setting.nostr_relay_url
+      res[:relays] = {
+        @user.nostr_pubkey => [ Setting.nostr_relay_url ]
+      }
+    end
+
     respond_to do |format|
       format.json do
-        render json: {
-          names: { "#{@user.cn}": @user.nostr_pubkey }
-        }.to_json
+        render json: res.to_json
       end
     end
   end

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_relay_url, type: :string,
+    default: ENV["NOSTR_RELAY_URL"].presence
+
   field :nostr_zaps_relay_limit, type: :integer,
     default: 12
 

app/services/nostr_manager/publish_zap_receipt.rb

@@ -6,8 +6,13 @@ module NostrManager
 
     def call
       tags = parse_tags(@zap.request_event.tags)
+      relays = tags[:relays].take(Setting.nostr_zaps_relay_limit)
 
-      tags[:relays].take(Setting.nostr_zaps_relay_limit).each do |relay_url|
+      if Setting.nostr_relay_url.present?
+        relays << Setting.nostr_relay_url
+      end
+
+      relays.uniq.each do |relay_url|
         if @delayed
           NostrPublishEventJob.perform_later(event: @zap.receipt, relay_url: relay_url)
         else

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_relay_url,
+        title: "Relay URL",
+        description: "Websockets URL of a relay associated with #{Setting.primary_domain}"
+      ) %>
 </ul>
 </section>
 <section>

spec/requests/well_known_spec.rb

@@ -45,6 +45,27 @@ RSpec.describe "Well-known URLs", type: :request do
         expect(res["names"].keys.size).to eq(1)
         expect(res["names"]["bobdylan"]).to eq(user.nostr_pubkey)
       end
+
+      context "without relay configured" do
+        it "does not include a recommended relay" do
+          get "/.well-known/nostr.json?name=bobdylan"
+          res = JSON.parse(response.body)
+          expect(res["relays"]).to be_nil
+        end
+      end
+
+      context "with relay configured" do
+        before do
+          Setting.nostr_relay_url = "wss://nostr.kosmos.org"
+        end
+
+        it "includes a recommended relay" do
+          get "/.well-known/nostr.json?name=bobdylan"
+          res = JSON.parse(response.body)
+          expect(res["relays"][user.nostr_pubkey].length).to eq(1)
+          expect(res["relays"][user.nostr_pubkey].first).to eq("wss://nostr.kosmos.org")
+        end
+      end
     end
   end
 end

spec/services/nostr_manager/publish_zap_receipt_spec.rb

@@ -35,6 +35,19 @@ RSpec.describe NostrManager::PublishZapReceipt, type: :model do
 
         described_class.call(zap: zap)
       end
+
+      context "with own relay configured" do
+        before do
+          Setting.nostr_relay_url = "wss://foobar.kosmos.org"
+        end
+
+        it "also publishes the receipt to our own relay" do
+          expect(NostrPublishEventJob).to receive(:perform_later)
+            .exactly(13).times.and_return(true)
+
+          described_class.call(zap: zap)
+        end
+      end
     end
   end
 end