add the current user to a group when the payment is successful

app/controllers/discourse_donations/charges_controller.rb

@@ -14,11 +14,24 @@ module DiscourseDonations
         response = {}
       end
 
+      if reward_user?(payment)
+        reward = DiscourseDonations::Rewards.new(current_user)
+        reward.add_to_group(SiteSetting.discourse_donations_reward_group) if add_to_group?
+      end
+
       render :json => response
     end
 
     private
 
+    def reward_user?(payment)
+      payment.present? && payment.successful? && current_user.present?
+    end
+
+    def add_to_group?
+      SiteSetting.discourse_donations_reward_group.present?
+    end
+
     def secret_key
       SiteSetting.discourse_donations_secret_key
     end

app/services/discourse_donations/rewards.rb

@@ -0,0 +1,14 @@
+
+
+module DiscourseDonations
+  class Rewards
+    def initialize(user)
+      @user = user
+    end
+
+    def add_to_group(name)
+      group = ::Group.find_by_name(name)
+      group.add(@user) if group.present?
+    end
+  end
+end

config/locales/server.en.yml

@@ -5,5 +5,5 @@ en:
     discourse_donations_public_key: Stripe Public Key
     discourse_donations_currency: Currency Code
     discourse_donations_hide_zip_code: Hide Zip Code
-    discourse_donations_grant_badge: Grant this badge to user when a payment is successful
-    discourse_donations_add_to_group: Add the user to this group when a payment is successful
+    discourse_donations_reward_badge: Grant this badge to user when a payment is successful
+    discourse_donations_reward_group: Add the user to this group when a payment is successful

config/settings.yml

@@ -15,9 +15,9 @@ plugins:
   discourse_donations_hide_zip_code:
     default: true
     client: true
-  discourse_donations_grant_badge:
+  discourse_donations_reward_badge:
     client: false
     default: 'Donation'
-  discourse_donations_add_to_group:
+  discourse_donations_reward_group:
     client: false
     default: 'Donation'

spec/services/discourse_donations/rewards_spec.rb

@@ -0,0 +1,17 @@
+require 'rails_helper'
+
+module DiscourseDonations
+  RSpec.describe DiscourseDonations::Rewards do
+    let(:grp) { Fabricate(:group, name: 'w00t') }
+    let(:user) { Fabricate(:user) }
+    subject { described_class.new(user) }
+
+    it 'adds the user to a group' do
+      Group.expects(:find_by_name).with(grp.name).returns(grp)
+      grp.expects(:add).with(user)
+      subject.add_to_group(grp.name)
+    end
+
+    it 'grants the user a badge'
+  end
+end