old_contents: from sfa.util.faults import *
  from sfa.util.xrn import urn_to_hrn
  from sfa.util.method import Method
  from sfa.util.parameter import Parameter
  from sfa.trust.credential import Credential
  from sfa.util.sfatime import utcparse
  import datetime
  
  class RenewSliver(Method):
      """
      Renews the resources in a sliver, extending the lifetime of the slice.    
      @param slice_urn (string) URN of slice to renew
      @param credentials ([string]) of credentials
      @param expiration_time (string) requested time of expiration
      
      """
      interfaces = ['aggregate', 'slicemgr']
      accepts = [
          Parameter(str, "Slice URN"),
          Parameter(type([str]), "List of credentials"),
          Parameter(str, "Expiration time in RFC 3339 format"),
          Parameter(str, "call_id"),
          ]
      returns = Parameter(bool, "Success or Failure")
  
      def call(self, slice_xrn, creds, expiration_time, call_id=""):
  
          (hrn, type) = urn_to_hrn(slice_xrn)
  
          self.api.logger.info("interface: %s\ttarget-hrn: %s\tcaller-creds: %s\tmethod-name: %s"%(self.api.interface, hrn, creds, self.name))
  
          # Find the valid credentials
          valid_creds = self.api.auth.checkCredentials(creds, 'renewsliver', hrn)
  
          # Validate that the time does not go beyond the credential's expiration time
          requested_time = utcparse(expiration_time)
          max_renew_days = int(api.config.SFA_MAX_SLICE_RENEW)
          if requested_time > Credential(string=valid_creds[0]).get_expiration():
              raise InsufficientRights('Renewsliver: Credential expires before requested expiration time')
          if requested_time > datetime.datetime.utcnow() + datetime.timedelta(days=max_renew_days):
              raise Exception('Cannot renew > %s days from now' % max_renew_days)
          manager = self.api.get_interface_manager()
          return manager.RenewSliver(self.api, slice_xrn, valid_creds, expiration_time, call_id)    
      
  
new_contents: from sfa.util.faults import *
  from sfa.util.xrn import urn_to_hrn
  from sfa.util.method import Method
  from sfa.util.parameter import Parameter
  from sfa.trust.credential import Credential
  from sfa.util.sfatime import utcparse
  import datetime
  
  class RenewSliver(Method):
      """
      Renews the resources in a sliver, extending the lifetime of the slice.    
      @param slice_urn (string) URN of slice to renew
      @param credentials ([string]) of credentials
      @param expiration_time (string) requested time of expiration
      
      """
      interfaces = ['aggregate', 'slicemgr']
      accepts = [
          Parameter(str, "Slice URN"),
          Parameter(type([str]), "List of credentials"),
          Parameter(str, "Expiration time in RFC 3339 format"),
          Parameter(str, "call_id"),
          ]
      returns = Parameter(bool, "Success or Failure")
  
      def call(self, slice_xrn, creds, expiration_time, call_id=""):
  
          (hrn, type) = urn_to_hrn(slice_xrn)
  
          self.api.logger.info("interface: %s\ttarget-hrn: %s\tcaller-creds: %s\tmethod-name: %s"%(self.api.interface, hrn, creds, self.name))
  
          # Find the valid credentials
          valid_creds = self.api.auth.checkCredentials(creds, 'renewsliver', hrn)
  
          # Validate that the time does not go beyond the credential's expiration time
          requested_time = utcparse(expiration_time)
          max_renew_days = int(self.api.config.SFA_MAX_SLICE_RENEW)
          if requested_time > Credential(string=valid_creds[0]).get_expiration():
              raise InsufficientRights('Renewsliver: Credential expires before requested expiration time')
          if requested_time > datetime.datetime.utcnow() + datetime.timedelta(days=max_renew_days):
              raise Exception('Cannot renew > %s days from now' % max_renew_days)
          manager = self.api.get_interface_manager()
          return manager.RenewSliver(self.api, slice_xrn, valid_creds, expiration_time, call_id)    
      
  
subject: fix NameError