added additional globus methods

        return token_response.by_resource_server

    def _get_transfer_client(self,client_id,tokens):

        """

        returns an authenticated Globus transfer client

        """

        transfer_tokens = tokens['transfer.api.globus.org']

        auth_client = globus_sdk.NativeAppAuthClient(client_id=client_id)

    def upload_resource(self):

        pass

    def download_resource(self,package,resource,dest_endpoint,dest_path):

    def download_resource(self,package,resource,dest_endpoint=olcfatlas,

                          dest_path='\~\'):

        '''

        use globus to download the resource to a destination endpoint

        parameters:

          - package: string

            name of package

          - resource: string

            name of resource

          - dest_endpoint: string (default: olcf - 'ef1a9560-7ca1-11e5-992c-22000b96db58')

            globus endpoint id of destination endpoint 

          - dest_path: string (default: "/~/")

            directory on endpoint to download resource into

        '''

        #check dest_path format

        if dest_path[-1] != '/':

            dest_path = dest_path + '/'

        return transfer_result["task_id"]

    def delete_resource(self):

    def delete_resource(self,package,resource):

        '''

        delete a resource from a package (Note: your api key must belong to a 

        sysadmin or the owner of the resource to delete a resource)

        parameters:

          - package: string

            name of package

          - resource: string

            name of resource

          - delete_from_nfs: boolean (default: False)

            if True, also delete the resource file from NFS

        '''

        pkg_metadata = self.ckan.action.package_show(id=package)

        resource_id = [metadata['id'] for metadata in pkg_metadata['resources'] \

                       if metadata['name']==resource][0]

        #delete from ckan

        self.ckan.action.resource_delete(id=resource_id)

        #delete file using globus

        resource_path = [metadata['url'] for metadata in pkg_metadata['resources'] \

                         if metadata['name']==resource][0]

        resource_path = resource_path.replace("file://CROSSBOW_NFS/", '/data/cades-crossbow/')

        ddata = globus_sdk.DeleteData(self.transfer, self.cadesdtn)

        ddata.add_item("/file/to/delete/file.txt")

        ddata.add_item(resource_path)

        delete_result = self.transfer.submit_delete(ddata)

        print("task_id =", delete_result["task_id"])

    def check_task_status(self):

        pass

        return delete_result["task_id"]

    def check_task_status(self,task_id):

        '''

        check on the status of a globus task

        parameters:

          - task_id: string

            id of task to check

        '''

        r = self.transfer.get_task(submit_result[task_id])

        print ("Label:", r["label"])

        print ("Status:", r["status"])

        print ("Transfer: {} -> {}".format(r["source_endpoint_display_name"],

                                           r["destination_endpoint_display_name"]))

        if r.data["status"] == "SUCCEEDED":

            print ("Bytes transferred:", r["bytes_transferred"])

            print ("Files transferred:", r["files_transferred"])

            print ("Transfer rate:", r["effective_bytes_per_second"], "bps")

#add model api later

#add scheduling api later (for both filters and models)