Rename Payments to PaymentOrders

app/models/payment_orders/every_pay.rb

@@ -0,0 +1,84 @@
+module PaymentOrders
+  class EveryPay < Base
+    USER       = ENV['payments_every_pay_api_user'].freeze
+    KEY        = ENV['payments_every_pay_api_key'].freeze
+    ACCOUNT_ID = ENV['payments_every_pay_seller_account'].freeze
+    SUCCESSFUL_PAYMENT = %w(settled authorized).freeze
+
+    def form_fields
+      base_json = base_params
+      base_json[:nonce] = SecureRandom.hex(15)
+      hmac_fields = (base_json.keys + ['hmac_fields']).sort.uniq!
+
+      base_json[:hmac_fields] = hmac_fields.join(',')
+      hmac_string = hmac_fields.map { |key, _v| "#{key}=#{base_json[key]}" }.join('&')
+      hmac = OpenSSL::HMAC.hexdigest('sha1', KEY, hmac_string)
+      base_json[:hmac] = hmac
+
+      base_json
+    end
+
+    def valid_response_from_intermediary?
+      return false unless response
+      valid_hmac? && valid_amount? && valid_account?
+    end
+
+    def settled_payment?
+      SUCCESSFUL_PAYMENT.include?(response[:payment_state])
+    end
+
+    def complete_transaction
+      return unless valid_response_from_intermediary? && settled_payment?
+
+      transaction = BankTransaction.find_by(
+        description: invoice.order,
+        currency:    invoice.currency,
+        iban:        invoice.seller_iban
+      )
+
+      transaction.sum = response[:amount]
+      transaction.paid_at = Date.strptime(response[:timestamp], '%s')
+      transaction.buyer_name = response[:cc_holder_name]
+
+      transaction.save!
+      transaction.autobind_invoice
+    end
+
+    private
+
+    def base_params
+      {
+        api_username: USER,
+        account_id: ACCOUNT_ID,
+        timestamp: Time.now.to_i.to_s,
+        callback_url: response_url,
+        customer_url: return_url,
+        amount: number_with_precision(invoice.total, precision: 2),
+        order_reference: SecureRandom.hex(15),
+        transaction_type: 'charge',
+        hmac_fields: ''
+      }.with_indifferent_access
+    end
+
+    def valid_hmac?
+      hmac_fields = response[:hmac_fields].split(',')
+      hmac_hash = {}
+      hmac_fields.map do |field|
+        symbol = field.to_sym
+        hmac_hash[symbol] = response[symbol]
+      end
+
+      hmac_string = hmac_hash.map { |key, _v| "#{key}=#{hmac_hash[key]}" }.join('&')
+      expected_hmac = OpenSSL::HMAC.hexdigest('sha1', KEY, hmac_string)
+      expected_hmac == response[:hmac]
+    end
+
+    def valid_amount?
+      invoice.total == BigDecimal.new(response[:amount])
+    end
+
+    def valid_account?
+      response[:account_id] == ACCOUNT_ID
+    end
+  end
+end