Confirm User API v2 endpoint

app/controllers/spree/api/v2/storefront/account_confirmations_controller.rb

@@ -0,0 +1,20 @@
+module Spree
+  module Api
+    module V2
+      module Storefront
+        class AccountConfirmationsController < ::Spree::Api::V2::BaseController
+
+          def show
+            user = Spree.user_class.confirm_by_token(params[:id])
+
+            if user.errors.empty?
+              render json: { data: { state: user.respond_to?(:state) ? user.state : '' } }, status: :ok
+            else
+              render json: { error: user.errors.full_messages.to_sentence }, status: :unprocessable_entity
+            end
+          end
+        end
+      end
+    end
+  end
+end

config/routes.rb

@@ -49,6 +49,7 @@
     namespace :v2 do
       namespace :storefront do
         resource :account, controller: :account, only: %i[show create update]
+        resources :account_confirmations, only: %i[show]
         resources :passwords, controller: :passwords, only: %i[create update]
       end
     end

spec/requests/spree/api/v2/storefront/account_confirmation_spec.rb

@@ -0,0 +1,44 @@
+require 'spec_helper'
+
+describe 'Storefront API v2 Account Confirmation spec', type: :request do
+  describe 'account_confirmations#show' do
+
+    before do
+      set_confirmable_option(true)
+      get "/api/v2/storefront/account_confirmations/#{confirmation_token}"
+    end
+
+    after(:each) { set_confirmable_option(false) }
+
+    context 'valid confirmation_token param' do
+      let(:user) { create(:user, confirmation_token: '12345') }
+      let(:confirmation_token) { user.confirmation_token }
+
+      it_behaves_like 'returns 200 HTTP status'
+
+      it 'returns user state' do
+        expect(JSON.parse(response.body)['data']['state']).to eq('')
+      end
+    end
+
+    context 'invalid confirmation_token param' do
+      let(:confirmation_token) { 'dummy_token' }
+
+      it 'return 422 status' do
+        expect(response.code).to eq('422')
+      end
+
+      it 'return JSON API payload of error' do
+        expect(JSON.parse(response.body)['error']).to eq("Confirmation token is invalid")
+      end
+    end
+
+    context 'blank confirmation_token param' do
+      let(:confirmation_token) { '' }
+
+      it 'return 301 status' do
+        expect(response.code).to eq('301')
+      end
+    end
+  end
+end