.env.example

@@ -11,6 +11,7 @@ BTCPAY_API_URL='http://localhost:23001/api/v1'
 
 LNDHUB_API_URL='http://localhost:3023'
 LNDHUB_PUBLIC_URL='https://lndhub.kosmos.org'
+LNDHUB_PUBLIC_KEY='0123d3be18617f39cf645851e3ba63f51fc13f0bb09e3bb25e6fd4de556486d946'
 LNDHUB_ADMIN_UI=true
 LNDHUB_PG_HOST=localhost
 LNDHUB_PG_PORT=5432

.env.test

@@ -4,5 +4,6 @@ BTCPAY_API_URL='http://btcpay.example.com/api/v1'
 
 LNDHUB_API_URL='http://localhost:3026'
 LNDHUB_PUBLIC_URL='https://lndhub.kosmos.org'
+LNDHUB_PUBLIC_KEY='024cd3be18617f39cf645851e3ba63f51fc13f0bb09e3bb25e6fd4de556486d946'
 
 WEBHOOKS_ALLOWED_IPS='10.1.1.23'

app/controllers/lnurlpay_controller.rb

@@ -1,4 +1,5 @@
 class LnurlpayController < ApplicationController
+  before_action :check_feature_enabled
   before_action :find_user_by_address
 
   MIN_SATS = 10
@@ -17,6 +18,20 @@ class LnurlpayController < ApplicationController
     }
   end
 
+  def keysend
+    http_status :not_found and return unless Setting.lndhub_keysend_enabled?
+
+    render json: {
+      status: "OK",
+      tag: "keysend",
+      pubkey: Setting.lndhub_public_key,
+      customData: [{
+        customKey: "696969",
+        customValue: @user.ln_account
+      }]
+    }
+  end
+
   def invoice
     amount = params[:amount].to_i / 1000 # msats
     address = params[:address]
@@ -72,4 +87,9 @@ class LnurlpayController < ApplicationController
     comment.length <= MAX_COMMENT_CHARS
   end
 
+  private
+
+  def check_feature_enabled
+    http_status :not_found unless Setting.lndhub_enabled?
+  end
 end

app/models/setting.rb

@@ -2,10 +2,27 @@
 class Setting < RailsSettings::Base
   cache_prefix { "v1" }
 
+  #
+  # Registrations
+  #
+
   field :reserved_usernames, type: :array, default: %w[
     account accounts donations mail webmaster support
   ]
 
-  field :lndhub_enabled, default: (ENV["LNDHUB_API_URL"].present?.to_s || "false"), type: :boolean
+  #
-  field :lndhub_admin_enabled, default: (ENV["LNDHUB_ADMIN_UI"] || "false"), type: :boolean
+  # Lightning Network
+  #
+
+  field :lndhub_enabled, type: :boolean,
+    default: (ENV["LNDHUB_API_URL"].present?.to_s || false)
+
+  field :lndhub_admin_enabled, type: :boolean,
+    default: (ENV["LNDHUB_ADMIN_UI"] || false)
+
+  field :lndhub_public_key, type: :string,
+    default: (ENV["LNDHUB_PUBLIC_KEY"] || "")
+
+  field :lndhub_keysend_enabled, type: :boolean,
+    default: -> { self.lndhub_public_key.present?.to_s || false }
 end

config/routes.rb

@@ -28,8 +28,12 @@ Rails.application.routes.draw do
   get 'wallet', to: 'wallet#index'
   get 'wallet/transactions', to: 'wallet#transactions'
 
-  get 'lnurlpay/:address', to: 'lnurlpay#index', constraints: { address: /[^\/]+/}
+  get 'lnurlpay/:address', to: 'lnurlpay#index',
-  get 'lnurlpay/:address/invoice', to: 'lnurlpay#invoice', constraints: { address: /[^\/]+/}
+    as: 'lightning_address', constraints: { address: /[^\/]+/}
+  get 'lnurlpay/:address/invoice', to: 'lnurlpay#invoice',
+    as: 'lnurlpay_invoice', constraints: { address: /[^\/]+/}
+  get 'keysend/:address', to: 'lnurlpay#keysend',
+    as: 'lightning_address_keysend', constraints: { address: /[^\/]+/}
 
   post 'webhooks/lndhub', to: 'webhooks#lndhub'
 

spec/requests/lnurlpay_spec.rb

@@ -0,0 +1,110 @@
+require 'rails_helper'
+
+RSpec.describe "/lnurlpay", type: :request do
+
+  context "Non-existent user/address" do
+    describe "GET /lnurlpay/:address" do
+      it "returns a 404" do
+        get lightning_address_path(address: "csw@kosmos.org")
+        expect(response).to have_http_status(:not_found)
+      end
+    end
+
+    describe "GET /lnurlpay/:address/invoice" do
+      it "returns a 404" do
+        get lnurlpay_invoice_path(address: "csw@kosmos.org", params: { amount: 5000 })
+        expect(response).to have_http_status(:not_found)
+      end
+    end
+
+    describe "GET /keysend/:address/" do
+      it "returns a 404" do
+        get lightning_address_keysend_path(address: "csw@kosmos.org")
+        expect(response).to have_http_status(:not_found)
+      end
+    end
+  end
+
+  context "Valid user/address" do
+    let(:user) { create :user, cn: 'satoshi', ou: 'kosmos.org', ln_account: 'abcdefg123456' }
+
+    before do
+      login_as user, :scope => :user
+    end
+
+    describe "GET /lnurlpay/:address" do
+      it "returns a formatted Lightning Address response" do
+        get lightning_address_path(address: "satoshi@kosmos.org")
+
+        expect(response).to have_http_status(:ok)
+
+        res = JSON.parse(response.body)
+        expect(res["status"]).to eq('OK')
+        expect(res["tag"]).to eq('payRequest')
+        expect(res["callback"]).to match(lnurlpay_invoice_path('satoshi@kosmos.org'))
+        expect(res["minSendable"]).to be_a(Integer)
+        expect(res["maxSendable"]).to be_a(Integer)
+        expect(res["commentAllowed"]).to be_a(Integer)
+      end
+    end
+
+    describe "GET /lnurlpay/:address/invoice" do
+      before do
+        allow_any_instance_of(User).to receive(:ln_create_invoice).and_return("lnbc50u1p3lwgknpp52g78gqya5euvzjc53fc6hkmlm2rfjhcd305tcmc0g9gaestav48sdq4gdhkven9v5sx6mmwv4ujzcqzpgxqyz5vqsp5skkz4jlqr6tkvv2g9739ygrjupc4rkqd94mc7dfpj3pgx3f6w7qs9qyyssq7mf3fzcuxlmkr9nqatcch3u8uf4gjyawe052tejz8e9fqxu4pncqk3qklt8g6ylpshg09xyjquyrgtc72vcw5cp0dzcf406apyua7dgpnfn7an")
+      end
+
+      it "returns a formatted lnurlpay response" do
+        get lnurlpay_invoice_path(address: "satoshi@kosmos.org", params: {
+          amount: 50000, comment: "Coffee time!"
+        })
+
+        expect(response).to have_http_status(:ok)
+
+        res = JSON.parse(response.body)
+        expect(res["status"]).to eq('OK')
+        expect(res["successAction"]["tag"]).to eq('message')
+        expect(res["successAction"]["message"]).to match('Thank you')
+        expect(res["pr"]).to eq("lnbc50u1p3lwgknpp52g78gqya5euvzjc53fc6hkmlm2rfjhcd305tcmc0g9gaestav48sdq4gdhkven9v5sx6mmwv4ujzcqzpgxqyz5vqsp5skkz4jlqr6tkvv2g9739ygrjupc4rkqd94mc7dfpj3pgx3f6w7qs9qyyssq7mf3fzcuxlmkr9nqatcch3u8uf4gjyawe052tejz8e9fqxu4pncqk3qklt8g6ylpshg09xyjquyrgtc72vcw5cp0dzcf406apyua7dgpnfn7an")
+      end
+
+      context "amount too low" do
+        it "returns an error" do
+          get lnurlpay_invoice_path(address: "satoshi@kosmos.org", params: {
+            amount: 5000, comment: "Coffee time!"
+          })
+          expect(response).to have_http_status(:ok)
+          res = JSON.parse(response.body)
+          expect(res["status"]).to eq('ERROR')
+          expect(res["reason"]).to eq('Invalid amount')
+        end
+      end
+
+      context "comment too long" do
+        it "returns an error" do
+          get lnurlpay_invoice_path(address: "satoshi@kosmos.org", params: {
+            amount: 5000000, comment: "Coffee time is the best time, so here's some money for you to get some. May I suggest to sample some Pacamara beans from El Salvador?"
+          })
+          expect(response).to have_http_status(:ok)
+          res = JSON.parse(response.body)
+          expect(res["status"]).to eq('ERROR')
+          expect(res["reason"]).to eq('Comment too long')
+        end
+      end
+    end
+
+    describe "GET /keysend/:address/" do
+      it "returns a formatted Lightning Address keysend response" do
+        get lightning_address_keysend_path(address: "satoshi@kosmos.org")
+
+        expect(response).to have_http_status(:ok)
+
+        res = JSON.parse(response.body)
+        expect(res["status"]).to eq('OK')
+        expect(res["tag"]).to eq('keysend')
+        expect(res["pubkey"]).to eq(Setting.lndhub_public_key)
+        expect(res["customData"][0]["customKey"]).to eq('696969')
+        expect(res["customData"][0]["customValue"]).to eq('abcdefg123456')
+      end
+    end
+  end
+end