Add kredits API with wallet balance endpoint

.env.test

@@ -1,3 +1,4 @@
 EJABBERD_API_URL='http://xmpp.example.com/api'
+BTCPAY_API_URL='http://btcpay.example.com'
 LNDHUB_API_URL='http://localhost:3023'
 LNDHUB_PUBLIC_URL='https://lndhub.kosmos.org'

app/controllers/api/base_controller.rb

@@ -0,0 +1,5 @@
+class Api::BaseController < ApplicationController
+
+  layout false
+
+end

app/controllers/api/kredits_controller.rb

@@ -0,0 +1,12 @@
+class Api::KreditsController < Api::BaseController
+
+  def onchain_btc_balance
+    btcpay = BtcPay.new
+    balance = btcpay.onchain_wallet_balance
+    render json: balance
+  rescue
+    render json: { error: 'Failed to fetch wallet balance' },
+           status: 500
+  end
+
+end

app/services/btc_pay.rb

@@ -9,12 +9,12 @@ class BtcPay
   end
 
   def onchain_wallet_balance
-    wallet_info = get "stores/#{@store_id}/payment-methods/onchain/BTC/wallet"
+    res = get "stores/#{@store_id}/payment-methods/onchain/BTC/wallet"
 
     {
-      balance: wallet_info["balance"].to_f,
-      unconfirmed_balance: wallet_info["unconfirmedBalance"].to_f,
-      confirmed_balance: wallet_info["confirmedBalance"].to_f
+      balance: res["balance"].to_f,
+      unconfirmed_balance: res["unconfirmedBalance"].to_f,
+      confirmed_balance: res["confirmedBalance"].to_f
     }
   end
 

config/credentials/test.yml.enc

@@ -1 +1 @@
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+IIjYiPSeZeMFhH8i8v8akXN4JrtGU+OsMQ8GAao/gVdesggriCBAQ8z+Vd0cmTf1SKYeT3OQDgygEekupr325P4eD9fZ+yi56EA/UMXQXMDVZAvZw7iwvKaOXpqisbWdJnomr1GXrHyR415Ce/Fxft3fgXDwMHJW2u+dDJgpE09uORnB9GXycFwHQmoIdXo=--iQ/Vcm0VcwHgUkwQ--tKHQW/45gM/s/NplqGPaxw==

config/routes.rb

@@ -25,6 +25,10 @@ Rails.application.routes.draw do
   get 'lnurlpay/:address', to: 'lnurlpay#index', constraints: { address: /[^\/]+/}
   get 'lnurlpay/:address/invoice', to: 'lnurlpay#invoice', constraints: { address: /[^\/]+/}
 
+  namespace :api do
+    get 'kredits/onchain_btc_balance', to: 'kredits#onchain_btc_balance'
+  end
+
   namespace :admin do
     root to: 'dashboard#index'
     get 'invitations', to: 'invitations#index'

spec/requests/api/kredits_spec.rb

@@ -0,0 +1,43 @@
+require 'rails_helper'
+require 'webmock/rspec'
+
+RSpec.describe "/api/kredits", type: :request do
+
+  describe "GET /onchain_btc_balance" do
+    before do
+      stub_request(:get, "http://btcpay.example.com/api/v1/stores/123456/payment-methods/onchain/BTC/wallet")
+        .to_return(status: 200, headers: {}, body: {
+          balance: 0.91108606,
+          unconfirmedBalance: 0,
+          confirmedBalance: 0.91108606
+        }.to_json)
+    end
+
+    it "returns a formatted result for the onchain wallet balance" do
+      get api_kredits_onchain_btc_balance_path
+
+      expect(response).to have_http_status(:ok)
+
+      res = JSON.parse(response.body)
+      expect(res["balance"]).to eq(0.91108606)
+      expect(res["unconfirmed_balance"]).to eq(0)
+      expect(res["confirmed_balance"]).to eq(0.91108606)
+    end
+
+    context "upstream request error" do
+      before do
+        stub_request(:get, "http://btcpay.example.com/api/v1/stores/123456/payment-methods/onchain/BTC/wallet")
+          .to_return(status: 500, headers: {}, body: "")
+      end
+
+      it "returns a formatted error" do
+        get api_kredits_onchain_btc_balance_path
+
+        expect(response).to have_http_status(:server_error)
+
+        res = JSON.parse(response.body)
+        expect(res["error"]).not_to be_nil
+      end
+    end
+  end
+end