Added support for invalid registration ids

lib/gcm.rb

@@ -133,6 +133,7 @@ def build_response(response, registration_ids = [])
       body = JSON.parse(body) unless body.empty?
       response_hash[:canonical_ids] = build_canonical_ids(body, registration_ids) unless registration_ids.empty?
       response_hash[:not_registered_ids] = build_not_registered_ids(body, registration_ids) unless registration_ids.empty?
+      response_hash[:invalid_registration_ids] = build_invalid_registration_ids(body, registration_ids) unless registration_ids.empty?
     when 400
       response_hash[:response] = 'Only applies for JSON requests. Indicates that the request could not be parsed as JSON, or it contained invalid fields.'
     when 401
@@ -169,11 +170,27 @@ def build_not_registered_ids(body, registration_id)
     not_registered_ids
   end
 
+  def build_invalid_registration_ids(body, registration_id)
+    invalid_registration_ids = []
+    unless body.empty?
+      if body['failure'] > 0
+        body['results'].each_with_index do |result, index|
+          invalid_registration_ids << registration_id[index] if is_invalid_registration?(result)
+        end
+      end
+    end
+    invalid_registration_ids
+  end
+
   def has_canonical_id?(result)
     !result['registration_id'].nil?
   end
 
   def is_not_registered?(result)
     result['error'] == 'NotRegistered'
   end
+
+  def is_invalid_registration?(result)
+    result['error'] == 'InvalidRegistration'
+  end
 end