WIP Check for zaps, send zap receipt on incoming zap tx

app/controllers/webhooks_controller.rb

@@ -7,6 +7,12 @@ class WebhooksController < ApplicationController
   def lndhub
     @user = User.find_by!(ln_account: @payload[:user_login])
 
+    if @zap_request = fetch_nostr_event_from_description
+      NostrManager::PublishZapReceipt.call(
+        user: @user, zap_request: @zap_request
+      )
+    end
+
     send_notifications
 
     head :ok
@@ -21,12 +27,17 @@ class WebhooksController < ApplicationController
   end
 
   def process_payload
-    begin
     @payload = JSON.parse(request.body.read, symbolize_names: true)
     head :no_content and return unless @payload[:type] == "incoming"
   rescue
     head :unprocessable_entity and return
   end
+
+  def fetch_nostr_event_from_description
+    memo_json = JSON.parse(@payload[:memo])
+    Nostr::Event.new(**memo_json.to_h.symbolize_keys)
+  rescue
+    nil
   end
 
   def send_notifications

app/services/nostr_manager/publish_zap_receipt.rb

@@ -0,0 +1,10 @@
+module NostrManager
+  class PublishZapReceipt < NostrManagerService
+    def initialize(user:, zap_request:)
+      @user, @zap_request = user, zap_request
+    end
+
+    def call
+    end
+  end
+end

spec/fixtures/lndhub/incoming-zap.json

@@ -0,0 +1,19 @@
+{
+  "id": 58,
+  "type": "incoming",
+  "user_login": "123456abcdef",
+  "amount": 21000,
+  "fee": 0,
+  "memo": "{\"id\":\"3cf02d7f0ccd9711c25098fc50b3a7ab880326e4e51cc8c7a7b59f147cff4fff\",\"sig\":\"e9e9bb2bac4267a107ab5c3368f504b4f11b8e3b5ae875a1d63c74d6934138d2521dc35815b6f534fc5d803cbf633736d871886368bb8f92c4ad3837a68a06f2\",\"pubkey\":\"730b43e6f62c2ab22710b046e481802c8ac1108ed2cb9c21dff808d57ba24b6c\",\"created_at\":1712487443,\"kind\":9734,\"tags\":[[\"relays\",\"wss://nostr.kosmos.org\",\"wss://relay.example.com\"],[\"p\",\"07e188a1ff87ce171d517b8ed2bb7a31b1d3453a0db3b15379ec07b724d232f3\"]],\"content\":\"\"}",
+  "description_hash": "b1a9910724bc9c1b03b4eba2e2d78ac69a8ac7b244e6ff6d4e7391bf6893f26a",
+  "payment_request": "lnbc1u1p3mull3pp5qw4x46ew6kjknudypyjsg8maw935tr5kkuz7t6h7pugp3pt4msyqhp5zp40yd97a028sgr9x4yxq5d57gft6vwja58e8cl0eea4uasr6apscqzpgxqyz5vqsp53m2n8h6yeflgukv5fhwm802kur6un9w8nvycl7auk67w5g2u008q9qyyssqml8rfmxyvp32qd5939qx7uu0w6ppjuujlpwsrz28m9u0dzp799hz5j72w0xm8pg97hd4hdvwh9zxaw2hewnnmzewvc550f9y3qsfaegphmk0mu",
+  "destination_pubkey_hex": "024cd3be18617f39cf645851e3ba63f51fc13f0bb09e3bb25e6fd4de556486d946",
+  "r_hash": "03aa6aeb2ed5a569f1a40925041f7d7163458e96b705e5eafe0f10188575dc08",
+  "preimage": "3539663535656537343331663432653165396430623966633664656664646563",
+  "keysend": false,
+  "state": "settled",
+  "created_at": "2023-01-11T09:22:57.546364Z",
+  "expires_at": "2023-01-12T09:22:57.547209Z",
+  "updated_at": "2023-01-11T09:22:58.046236131Z",
+  "settled_at": "2023-01-11T09:22:58.046232174Z"
+}

spec/requests/webhooks_spec.rb

@@ -53,9 +53,7 @@ RSpec.describe "Webhooks", type: :request do
       let(:user) { create :user, ln_account: "123456abcdef" }
       let(:payload) { JSON.parse(File.read(File.expand_path("../fixtures/lndhub/incoming.json", File.dirname(__FILE__)))) }
 
-      before do
-        user.save! #FIXME this should not be necessary
-      end
+      before { user.save! } #FIXME this should not be necessary
 
       it "returns a 200 status" do
         post "/webhooks/lndhub", params: payload.to_json
@@ -63,9 +61,15 @@ RSpec.describe "Webhooks", type: :request do
       end
 
       it "does not send notifications by default" do
+        post "/webhooks/lndhub", params: payload.to_json
         expect(enqueued_jobs.size).to eq(0)
       end
 
+      it "does not send a zap receipt" do
+        expect(NostrManager::PublishZapReceipt).not_to receive(:call)
+        post "/webhooks/lndhub", params: payload.to_json
+      end
+
       context "notification preference set to 'xmpp'" do
         before do
           Setting.xmpp_notifications_from_address = "botka@kosmos.org"
@@ -103,5 +107,22 @@ RSpec.describe "Webhooks", type: :request do
         end
       end
     end
+
+    describe "Valid payload for zap transaction" do
+      let(:user) { create :user, ln_account: "123456abcdef" }
+      let(:payload) { JSON.parse(File.read(File.expand_path("../fixtures/lndhub/incoming-zap.json", File.dirname(__FILE__)))) }
+
+      before { user.save! } #FIXME this should not be necessary
+
+      it "returns a 200 status" do
+        post "/webhooks/lndhub", params: payload.to_json
+        expect(response).to have_http_status(:ok)
+      end
+
+      it "sends a zap receipt" do
+        expect(NostrManager::PublishZapReceipt).to receive(:call)
+        post "/webhooks/lndhub", params: payload.to_json
+      end
+    end
   end
 end