WIP Persist zaps, create and send zap receipts

app/controllers/lnurlpay_controller.rb

@@ -52,7 +52,7 @@ class LnurlpayController < ApplicationController
       return
     end
 
-    if params[:nostr].present?
+    if params[:nostr].present?# TODO && Setting.nostr_enabled?
       handle_zap_request amount, params[:nostr], params[:lnurl]
     else
       handle_pay_request address, amount, comment
@@ -131,6 +131,9 @@ class LnurlpayController < ApplicationController
         return
       end
 
+      # TODO might want to use the existing invoice and zap record if there are
+      # multiple calls with the same zap request
+
       desc = "Zap for #{@user.address}"
       desc = "#{desc}: \"#{event.content}\"" if event.content.present?
 
@@ -142,6 +145,10 @@ class LnurlpayController < ApplicationController
         }
       )
 
+      @user.zaps.create! request: event,
+                         payment_request: invoice["payment_request"],
+                         amount: amount
+
       render json: { status: "OK", pr: invoice["payment_request"] }
     end
 end

app/controllers/webhooks_controller.rb

@@ -7,10 +7,14 @@ 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
+    if zap = @user.zaps.find_by(payment_request: @payload[:payment_request])
+      zap_receipt = NostrManager::CreateZapReceipt.call(
+        zap: zap,
+        paid_at: Time.parse(@payload[:settled_at]).to_i,
+        preimage: @payload[:preimage]
       )
+      zap.update! receipt: zap_receipt.to_h
+      NostrManager::PublishZapReceipt.call(zap: zap)
     end
 
     send_notifications
@@ -28,21 +32,16 @@ class WebhooksController < ApplicationController
 
   def process_payload
     @payload = JSON.parse(request.body.read, symbolize_names: true)
-    head :no_content and return unless @payload[:type] == "incoming"
+    unless @payload[:type] == "incoming" &&
+           @payload[:state] == "settled"
+      head :no_content and return
+    end
   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
-    notify = @user.preferences[:lightning_notify_sats_received]
-    case notify
+    case @user.preferences[:lightning_notify_sats_received]
     when "xmpp"
       notify_xmpp
     when "email"

app/jobs/nostr_publish_event_job.rb

@@ -0,0 +1,7 @@
+class NostrPublishEventJob < ApplicationJob
+  queue_as :nostr
+
+  def perform(event:, relay:)
+    NostrManager::PublishEvent.call(event: event, relay: relay)
+  end
+end

app/models/zap.rb

@@ -1,3 +1,17 @@
 class Zap < ApplicationRecord
   belongs_to :user
+
+  def request_event
+    nostr_event_from_hash(request)
+  end
+
+  def receipt_event
+    nostr_event_from_hash(receipt)
+  end
+
+  private
+
+    def nostr_event_from_hash(hash)
+      Nostr::Event.new(**hash.symbolize_keys)
+    end
 end

app/services/nostr_manager/create_zap_receipt.rb

@@ -0,0 +1,25 @@
+module NostrManager
+  class CreateZapReceipt < NostrManagerService
+    def initialize(zap:, paid_at:, preimage:)
+      @zap, @paid_at, @preimage = zap, paid_at, preimage
+    end
+
+    def call
+      request_tags = parse_tags(@zap.request_event.tags)
+
+      site_user.create_event(
+        kind: 9735,
+        created_at: @paid_at,
+        content: "",
+        tags: [
+          ["p", request_tags[:p].first],
+          ["e", request_tags[:e]&.first],
+          ["a", request_tags[:a]&.first],
+          ["bolt11", @zap.payment_request],
+          ["preimage", @preimage],
+          ["description", @zap.request_event.to_json]
+        ].reject { |t| t[1].nil? }
+      )
+    end
+  end
+end

app/services/nostr_manager/publish_event.rb

@@ -1,17 +1,17 @@
 module NostrManager
   class PublishEvent < NostrManagerService
-    def initialize(event: nil, relay: nil)
-      # @relay = relay
-      @relay = Nostr::Relay.new(url: 'ws://nostr-relay:7777', name: 'strfry')
-      keypair = Nostr::KeyPair.new(
-        private_key: Nostr::PrivateKey.new(Setting.nostr_private_key),
-        public_key: Nostr::PublicKey.new(Setting.nostr_public_key)
-      )
-      @user = Nostr::User.new(keypair: keypair)
-      @event = @user.create_event(
-        kind: Nostr::EventKind::TEXT_NOTE,
-        content: "The time is #{Time.now.strftime('%H:%M:%S')}"
-      )
+    def initialize(event: nil, relay_url: nil)
+      relay_name = relay_url.gsub(/^ws(s):\/\//, "")
+      @relay = Nostr::Relay.new(url: relay_url, name: relay_name)
+      @event = case event.class
+               when Nostr::Event
+                 event
+               when Hash
+                 Nostr::Event.new(**event.symbolize_keys)
+               # else
+                 # TODO
+                 # raise NotImplementedError
+               end
       @client = Nostr::Client.new
     end
 
@@ -25,6 +25,7 @@ module NostrManager
       end
 
       client.on :error do |e|
+        # TODO log relay URL/name
         puts "Error: #{e}"
         puts "Closing thread..."
         Thread.exit
@@ -36,6 +37,7 @@ module NostrManager
         if msg[0] == "OK" && msg[1] == event.id
           puts "Event published. Closing thread..."
         else
+          # TODO log relay URL/name
           puts "Unexpected message from relay. Closing thread..."
         end
         Thread.exit

app/services/nostr_manager/publish_zap_receipt.rb

@@ -1,10 +1,20 @@
 module NostrManager
   class PublishZapReceipt < NostrManagerService
-    def initialize(user:, zap_request:)
-      @user, @zap_request = user, zap_request
+    def initialize(zap:, delayed: true)
+      @zap, @delayed = zap, delayed
     end
 
     def call
+      tags = parse_tags(@zap.request_event.tags)
+
+      # TODO limit to 15 or so relays
+      tags[:relays].each do |relay_url|
+        if @delayed
+          NostrPublishEventJob.perform_later(event: @zap.receipt, relay: relay_url)
+        else
+          NostrManager::PublishEvent.call(event: @zap.receipt_event, relay: relay_url)
+        end
+      end
     end
   end
 end

app/services/nostr_manager_service.rb

@@ -8,4 +8,15 @@ class NostrManagerService < ApplicationService
     end
     out
   end
+
+  def site_keypair
+    Nostr::KeyPair.new(
+      private_key: Nostr::PrivateKey.new(Setting.nostr_private_key),
+      public_key: Nostr::PublicKey.new(Setting.nostr_public_key)
+    )
+  end
+
+  def site_user
+    Nostr::User.new(keypair: site_keypair)
+  end
 end