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 importlib
  18 from osm_im.vnfd import vnfd as vnfd_im
  19 from osm_im.nsd import nsd as nsd_im
  20 from osm_im.nst import nst as nst_im
  21 etsi_nfv_vnfd = importlib.import_module("osm_im.etsi-nfv-vnfd")
  22 etsi_nfv_nsd = importlib.import_module("osm_im.etsi-nfv-nsd")
  23 from pyangbind.lib.serialise import pybindJSONDecoder
  24 import pyangbind.lib.pybindJSON as pybindJSON
  25
  26 class ValidationException(Exception):
  27     pass
  28
  29 class Validation:
  30
  31     def pyangbind_validation(self, item, data, force=False):
  32         '''
  33         item: vnfd, nst, nsd
  34         data: dict object loaded from the descriptor file
  35         force: True to skip unknown fields in the descriptor
  36         '''
  37         if item == "vnfd":
  38             myobj = vnfd_im()
  39         elif item == "nsd":
  40             myobj = nsd_im()
  41         elif item == "nst":
  42             myobj = nst_im()
  43         elif item == "etsi_nfv_vnfd":
  44             myobj = etsi_nfv_vnfd.etsi_nfv_vnfd()
  45         elif item == "etsi_nfv_nsd":
  46             myobj = etsi_nfv_nsd.etsi_nfv_nsd()
  47         else:
  48             raise ValidationException("Not possible to validate '{}' item".format(item))
  49
  50         try:
  51             pybindJSONDecoder.load_ietf_json(data, None, None, obj=myobj,
  52                                              path_helper=True, skip_unknown=force)
  53             out = pybindJSON.dumps(myobj, mode="ietf")
  54             desc_out = yaml.safe_load(out)
  55             return desc_out
  56         except Exception as e:
  57             raise ValidationException("Error in pyangbind validation: {}".format(str(e)))
  58
  59     def yaml_validation(self, descriptor):
  60         try:
  61             data = yaml.safe_load(descriptor)
  62         except Exception as e:
  63             raise ValidationException("Error in YAML validation. Not a proper YAML file: {}".format(e))
  64         if 'vnfd:vnfd-catalog' in data or 'vnfd-catalog' in data:
  65             item = "vnfd"
  66         elif 'nsd:nsd-catalog' in data or 'nsd-catalog' in data:
  67             item = "nsd"
  68         elif 'nst' in data:
  69             item = "nst"
  70         elif 'vnfd' in data:
  71             item = "etsi_nfv_vnfd"
  72         elif 'nsd' in data:
  73             item = "etsi_nfv_nsd"
  74         else:
  75             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")
  76
  77         return item, data
  78
  79     def descriptor_validation(self, descriptor):
  80         item, data = self.yaml_validation(descriptor)
  81         self.pyangbind_validation(item, data)
  82