164 lines
6.5 KiB
Python
164 lines
6.5 KiB
Python
# Copyright 2019 AT&T Intellectual Property. All other rights reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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from glob import glob
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import logging
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import os
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from jsonschema import Draft7Validator
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import yaml
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from spyglass import exceptions
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from spyglass.validators.validator import BaseDocumentValidator
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LOG = logging.getLogger(__name__)
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LOG_FORMAT = '%(asctime)s %(levelname)-8s %(name)s:' \
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'%(funcName)s [%(lineno)3d] %(message)s'
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class JSONSchemaValidator(BaseDocumentValidator):
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"""Validator for validating documents using jsonschema"""
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def __init__(
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self,
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document_path,
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schema_path,
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document_extension='.yaml',
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schema_extension='.yaml',
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document_loader=yaml.safe_load,
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schema_loader=yaml.safe_load):
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super().__init__()
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# Check that given paths are valid
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if not os.path.exists(document_path):
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raise exceptions.PathDoesNotExistError(
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file_type='Document', path=document_path)
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if not os.path.exists(schema_path):
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raise exceptions.PathDoesNotExistError(
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file_type='Schema', path=schema_path)
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# Extract list of document file paths from path
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if os.path.isdir(document_path):
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# Create match string and use glob to generate list of file paths
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match = os.path.join(document_path, '**', '*' + document_extension)
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self.documents = glob(match, recursive=True)
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# Directory should not be empty
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if not self.documents:
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raise exceptions.DirectoryEmptyError(
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ext=document_extension, path=document_path)
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elif os.path.splitext(document_path) == document_extension:
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# Single files can just be appended to the list to process the same
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# so long as the extension matches
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self.documents.append(document_path)
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else:
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# Throw error if unexpected file type given
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raise exceptions.UnexpectedFileType(
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found_ext=os.path.splitext(document_path),
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expected_ext=document_extension)
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# Extract list of schema file paths from path
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if os.path.isdir(schema_path):
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# Create match string and use glob to generate list of file paths
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match = os.path.join(schema_path, '**', '*' + schema_extension)
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self.schemas = glob(match, recursive=True)
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# Directory should not be empty
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if not self.schemas:
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raise exceptions.DirectoryEmptyError(
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ext=schema_extension, path=schema_path)
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elif os.path.splitext(schema_path) == schema_extension:
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# Single files can just be appended to the list to process the same
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self.schemas.append(schema_path)
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else:
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# Throw error if unexpected file type given
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raise exceptions.UnexpectedFileType(
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found_ext=os.path.splitext(schema_path),
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expected_ext=schema_extension)
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# Initialize pairs list for next step
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self.document_schema_pairs = []
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self.document_loader = document_loader
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self.schema_loader = schema_loader
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self._match_documents_to_schemas()
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def _match_documents_to_schemas(self):
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"""Pairs documents to their schemas for easier processing
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Loops through all documents and finds its associated schema using the
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"schema" key from documents and the "metadata:name" key from schemas.
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Matching document/schema pairs are added to document_schema_pairs. Any
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unmatched documents will display a warning.
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"""
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if not self.documents:
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LOG.warning('No documents found.')
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if not self.schemas:
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LOG.warning('No schemas found.')
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for document in self.documents:
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pair_found = False
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with open(document, 'r') as f_doc:
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loaded_doc = self.document_loader(f_doc)
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if 'schema' in loaded_doc:
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schema_name = loaded_doc['schema']
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for schema in self.schemas:
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with open(schema, 'r') as f_schema:
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loaded_schema = self.schema_loader(f_schema)
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if schema_name == loaded_schema['metadata']['name']:
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self.document_schema_pairs.append((document, schema))
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pair_found = True
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break
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else:
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LOG.warning('No schema entry found for file %s', document)
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if not pair_found:
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LOG.warning(
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'No matching schema found for file %s, '
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'data will not be validated.', document)
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def _validate_file(self, document, schema):
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"""Validate a document against a schema using JSON Schema Draft 7
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:param document: File path to the document to validate
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:param schema: File path to the schema used to validate document
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:return: A list of errors from the validator
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"""
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with open(document, 'r') as f_doc:
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loaded_doc = self.document_loader(f_doc)
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with open(schema, 'r') as f_schema:
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loaded_schema = self.schema_loader(f_schema)
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validator = Draft7Validator(loaded_schema)
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return sorted(validator.iter_errors(loaded_doc), key=lambda e: e.path)
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def validate(self):
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"""Validates document against its schema
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Loops through document_schema_pairs list and validates each pair. Any
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errors are logged and returned in a dictionary by file.
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:return: A dictionary of filenames and their list of validation errors
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"""
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error_list = {}
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for document, schema in self.document_schema_pairs:
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LOG.info(
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'Validating document %s using schema %s', document, schema)
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errors = self._validate_file(document, schema)
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if errors:
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for error in errors:
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LOG.error(error.message)
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error_list[document] = errors
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return error_list
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