Update Secure Pay AU to meet spec document for MessageInfo element

git-svn-id: https://activemerchant.googlecode.com/svn/trunk/active_merchant@635 6513ea26-6c20-0410-8a68-89cd7235086d

CHANGELOG

@@ -1,5 +1,6 @@
 = ActiveMerchant CHANGELOG
 
+* Update Secure Pay Au to meet specs for MessageInfo elements [cody]
 * Add support for the Australian Secure Pay payment gateway [cody]
 * Allow LinkPoint cancellations for recurring billing. [yanagimoto.shin]
 * Add support for Åland Islands to the country list [cody]

lib/active_merchant/billing/gateways/secure_pay_au.rb

@@ -69,8 +69,8 @@ def build_request(action, body)
         xml.instruct!
         xml.tag! 'SecurePayMessage' do
           xml.tag! 'MessageInfo' do
-            xml.tag! 'messageID', Utils.generate_unique_id
-            xml.tag! 'messageTimestamp', ''
+            xml.tag! 'messageID', Utils.generate_unique_id.slice(0, 30)
+            xml.tag! 'messageTimestamp', generate_timestamp
             xml.tag! 'timeoutValue', request_timeout
             xml.tag! 'apiVersion', API_VERSION
           end
@@ -138,7 +138,13 @@ def parse_element(response, node)
         else
           response[node.name.underscore.to_sym] = node.text
         end
-      end     
+      end
+
+      # YYYYDDMMHHNNSSKKK000sOOO
+      def generate_timestamp
+        time = Time.now.utc
+        time.strftime("%Y%d%m%H%M%S#{time.usec}+000")
+      end  
     end
   end
 end