osm_im/validation.py

   1 # -*- coding: utf-8 -*-
   2
   3 # Licensed under the Apache License, Version 2.0 (the "License");
   4 # you may not use this file except in compliance with the License.
   5 # You may obtain a copy of the License at
   6 #
   7 #    http://www.apache.org/licenses/LICENSE-2.0
   8 #
   9 # Unless required by applicable law or agreed to in writing, software
  10 # distributed under the License is distributed on an "AS IS" BASIS,
  11 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
  12 # implied.
  13 # See the License for the specific language governing permissions and
  14 # limitations under the License.
  15
  16 import yaml
  17 import json
  18 # import logging
  19 from osm_im.vnfd import vnfd as vnfd_im
  20 from osm_im.nsd import nsd as nsd_im
  21 from osm_im.nst import nst as nst_im
  22 from pyangbind.lib.serialise import pybindJSONDecoder
  23 import pyangbind.lib.pybindJSON as pybindJSON
  24
  25 class ValidationException(Exception):
  26     pass
  27
  28 class Validation:
  29
  30     def pyangbind_validation(self, item, data, force=False):
  31         '''
  32         item: vnfd, nst, nsd
  33         data: dict object loaded from the descriptor file
  34         force: True to skip unknown fields in the descriptor
  35         '''
  36         if item == "vnfd":
  37             myobj = vnfd_im()
  38         elif item == "nsd":
  39             myobj = nsd_im()
  40         elif item == "nst":
  41             myobj = nst_im()
  42         else:
  43             raise ValidationException("Not possible to validate '{}' item".format(item))
  44
  45         try:
  46             pybindJSONDecoder.load_ietf_json(data, None, None, obj=myobj,
  47                                              path_helper=True, skip_unknown=force)
  48             out = pybindJSON.dumps(myobj, mode="ietf")
  49             desc_out = yaml.safe_load(out)
  50             return desc_out
  51         except Exception as e:
  52             raise ValidationException("Error in pyangbind validation: {}".format(str(e)))
  53
  54     def yaml_validation(self, descriptor):
  55         try:
  56             data = yaml.safe_load(descriptor)
  57         except Exception as e:
  58             raise ValidationException("Error in YAML validation. Not a proper YAML file: {}".format(e))
  59         if 'vnfd:vnfd-catalog' in data or 'vnfd-catalog' in data:
  60             item = "vnfd"
  61         elif 'nsd:nsd-catalog' in data or 'nsd-catalog' in data:
  62             item = "nsd"
  63         elif 'nst' in data:
  64             item = "nst"
  65         else:
  66             raise ValidationException("Error in YAML validation. Not possible to determine the type of descriptor in the first line. Expected values: vnfd:vnfd-catalog, vnfd-catalog, nsd:nsd-catalog, nsd-catalog, nst")
  67
  68         return item, data
  69
  70     def descriptor_validation(self, descriptor):
  71         item, data = self.yaml_validation(descriptor)
  72         self.pyangbind_validation(item, data)
  73