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# Copyright ETSI Contributors and Others. |
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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 |
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# 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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import os |
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import yaml |
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import hashlib |
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|
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class SOLPackageException(Exception): |
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pass |
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|
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class SOLPackage: |
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_METADATA_FILE_PATH = "TOSCA-Metadata/TOSCA.meta" |
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_METADATA_DESCRIPTOR_FIELD = "Entry-Definitions" |
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_METADATA_MANIFEST_FIELD = "ETSI-Entry-Manifest" |
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_METADATA_CHANGELOG_FIELD = "ETSI-Entry-Change-Log" |
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_METADATA_LICENSES_FIELD = "ETSI-Entry-Licenses" |
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_METADATA_DEFAULT_CHANGELOG_PATH = "ChangeLog.txt" |
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_METADATA_DEFAULT_LICENSES_PATH = "Licenses" |
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_MANIFEST_FILE_PATH_FIELD = "Source" |
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_MANIFEST_FILE_HASH_ALGORITHM_FIELD = "Algorithm" |
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_MANIFEST_FILE_HASH_DIGEST_FIELD = "Hash" |
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_MANIFEST_ALL_FIELDS = [] |
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|
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def __init__(self, package_path=""): |
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self._package_path = package_path |
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|
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self._package_metadata = self._parse_package_metadata() |
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|
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try: |
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self._manifest_data = self._parse_manifest_data() |
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except Exception: |
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self._manifest_data = None |
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|
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try: |
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self._manifest_metadata = self._parse_manifest_metadata() |
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except Exception: |
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self._manifest_metadata = None |
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|
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def _parse_package_metadata(self): |
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try: |
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return self._parse_package_metadata_with_metadata_dir() |
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except FileNotFoundError: |
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return self._parse_package_metadata_without_metadata_dir() |
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|
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def _parse_package_metadata_with_metadata_dir(self): |
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try: |
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return self._parse_file_in_blocks(self._METADATA_FILE_PATH) |
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except FileNotFoundError as e: |
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raise e |
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except (Exception, OSError) as e: |
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raise SOLPackageException( |
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"Error parsing {}: {}".format(self._METADATA_FILE_PATH, e) |
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) |
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def _parse_package_metadata_without_metadata_dir(self): |
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package_root_files = {f for f in os.listdir(self._package_path)} |
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package_root_yamls = [ |
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f for f in package_root_files if f.endswith(".yml") or f.endswith(".yaml") |
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] |
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if len(package_root_yamls) != 1: |
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error_msg = "Error parsing package metadata: there should be exactly 1 descriptor YAML, found {}" |
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raise SOLPackageException(error_msg.format(len(package_root_yamls))) |
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base_manifest = [ |
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{ |
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SOLPackage._METADATA_DESCRIPTOR_FIELD: package_root_yamls[0], |
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SOLPackage._METADATA_MANIFEST_FIELD: "{}.mf".format( |
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os.path.splitext(package_root_yamls[0])[0] |
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), |
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SOLPackage._METADATA_CHANGELOG_FIELD: SOLPackage._METADATA_DEFAULT_CHANGELOG_PATH, |
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SOLPackage._METADATA_LICENSES_FIELD: SOLPackage._METADATA_DEFAULT_LICENSES_PATH, |
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} |
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] |
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return base_manifest |
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|
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def _parse_manifest_data(self): |
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manifest_path = None |
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for tosca_meta in self._package_metadata: |
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if SOLPackage._METADATA_MANIFEST_FIELD in tosca_meta: |
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manifest_path = tosca_meta[SOLPackage._METADATA_MANIFEST_FIELD] |
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break |
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else: |
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error_msg = "Error parsing {}: no {} field on path".format( |
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self._METADATA_FILE_PATH, self._METADATA_MANIFEST_FIELD |
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) |
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raise SOLPackageException(error_msg) |
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try: |
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return self._parse_file_in_blocks(manifest_path) |
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except (Exception, OSError) as e: |
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raise SOLPackageException("Error parsing {}: {}".format(manifest_path, e)) |
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def _parse_manifest_metadata(self): |
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try: |
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base_manifest = {} |
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manifest_file = os.open( |
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os.path.join( |
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self._package_path, |
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base_manifest[SOLPackage._METADATA_MANIFEST_FIELD], |
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), |
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"rw", |
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) |
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for line in manifest_file: |
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fields_in_line = line.split(":", maxsplit=1) |
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fields_in_line[0] = fields_in_line[0].strip() |
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fields_in_line[1] = fields_in_line[1].strip() |
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if fields_in_line[0] in self._MANIFEST_ALL_FIELDS: |
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base_manifest[fields_in_line[0]] = fields_in_line[1] |
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return base_manifest |
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except (Exception, OSError) as e: |
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raise SOLPackageException( |
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"Error parsing {}: {}".format( |
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base_manifest[SOLPackage._METADATA_MANIFEST_FIELD], e |
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) |
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) |
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def _get_package_file_full_path(self, file_relative_path): |
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return os.path.join(self._package_path, file_relative_path) |
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def _parse_file_in_blocks(self, file_relative_path): |
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file_path = self._get_package_file_full_path(file_relative_path) |
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with open(file_path) as f: |
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blocks = f.read().split("\n\n") |
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parsed_blocks = map(yaml.safe_load, blocks) |
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return [block for block in parsed_blocks if block is not None] |
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def _get_package_file_manifest_data(self, file_relative_path): |
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for file_data in self._manifest_data: |
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if ( |
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file_data.get(SOLPackage._MANIFEST_FILE_PATH_FIELD, "") |
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== file_relative_path |
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): |
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return file_data |
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error_msg = ( |
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"Error parsing {} manifest data: file not found on manifest file".format( |
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file_relative_path |
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) |
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) |
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raise SOLPackageException(error_msg) |
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def get_package_file_hash_digest_from_manifest(self, file_relative_path): |
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"""Returns the hash digest of a file inside this package as specified on the manifest file.""" |
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file_manifest_data = self._get_package_file_manifest_data(file_relative_path) |
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try: |
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return file_manifest_data[SOLPackage._MANIFEST_FILE_HASH_DIGEST_FIELD] |
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except Exception as e: |
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raise SOLPackageException( |
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"Error parsing {} hash digest: {}".format(file_relative_path, e) |
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) |
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def get_package_file_hash_algorithm_from_manifest(self, file_relative_path): |
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"""Returns the hash algorithm of a file inside this package as specified on the manifest file.""" |
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file_manifest_data = self._get_package_file_manifest_data(file_relative_path) |
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try: |
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return file_manifest_data[SOLPackage._MANIFEST_FILE_HASH_ALGORITHM_FIELD] |
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except Exception as e: |
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raise SOLPackageException( |
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"Error parsing {} hash digest: {}".format(file_relative_path, e) |
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) |
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@staticmethod |
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def _get_hash_function_from_hash_algorithm(hash_algorithm): |
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function_to_algorithm = {"SHA-256": hashlib.sha256, "SHA-512": hashlib.sha512} |
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if hash_algorithm not in function_to_algorithm: |
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error_msg = ( |
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"Error checking hash function: hash algorithm {} not supported".format( |
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hash_algorithm |
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) |
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) |
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raise SOLPackageException(error_msg) |
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return function_to_algorithm[hash_algorithm] |
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def _calculate_file_hash(self, file_relative_path, hash_algorithm): |
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file_path = self._get_package_file_full_path(file_relative_path) |
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hash_function = self._get_hash_function_from_hash_algorithm(hash_algorithm) |
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try: |
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with open(file_path, "rb") as f: |
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return hash_function(f.read()).hexdigest() |
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except Exception as e: |
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raise SOLPackageException( |
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"Error hashing {}: {}".format(file_relative_path, e) |
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) |
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def validate_package_file_hash(self, file_relative_path): |
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"""Validates the integrity of a file using the hash algorithm and digest on the package manifest.""" |
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hash_algorithm = self.get_package_file_hash_algorithm_from_manifest( |
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file_relative_path |
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) |
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file_hash = self._calculate_file_hash(file_relative_path, hash_algorithm) |
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expected_file_hash = self.get_package_file_hash_digest_from_manifest( |
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file_relative_path |
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) |
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if file_hash != expected_file_hash: |
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error_msg = "Error validating {} hash: calculated hash {} is different than manifest hash {}" |
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raise SOLPackageException( |
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error_msg.format(file_relative_path, file_hash, expected_file_hash) |
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) |
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def validate_package_hashes(self): |
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"""Validates the integrity of all files listed on the package manifest.""" |
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for file_data in self._manifest_data: |
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if SOLPackage._MANIFEST_FILE_PATH_FIELD in file_data: |
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file_relative_path = file_data[SOLPackage._MANIFEST_FILE_PATH_FIELD] |
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self.validate_package_file_hash(file_relative_path) |
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def create_or_update_metadata_file(self): |
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""" |
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Creates or updates the metadata file with the hashes calculated for each one of the package's files |
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""" |
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if not self._manifest_metadata: |
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self.generate_manifest_data_from_descriptor() |
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self.write_manifest_data_into_file() |
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def generate_manifest_data_from_descriptor(self): |
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pass |
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def write_manifest_data_into_file(self): |
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with open(self.get_manifest_location(), "w") as metadata_file: |
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# Write manifest metadata |
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for metadata_entry in self._manifest_metadata: |
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metadata_file.write( |
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"{}: {}\n".format( |
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metadata_entry, self._manifest_metadata[metadata_entry] |
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) |
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) |
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|
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# Write package's files hashes |
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file_hashes = {} |
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for root, dirs, files in os.walk(self._package_path): |
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for a_file in files: |
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file_path = os.path.join(root, a_file) |
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file_relative_path = file_path[len(self._package_path) :] |
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if file_relative_path.startswith("/"): |
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file_relative_path = file_relative_path[1:] |
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file_hashes[file_relative_path] = self._calculate_file_hash( |
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file_relative_path, "SHA-512" |
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) |
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|
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for file, hash in file_hashes.items(): |
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file_block = "Source: {}\nAlgorithm: SHA-512\nHash: {}\n\n".format( |
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file, hash |
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) |
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metadata_file.write(file_block) |
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def get_descriptor_location(self): |
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"""Returns this package descriptor location as a relative path from the package root.""" |
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for tosca_meta in self._package_metadata: |
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if SOLPackage._METADATA_DESCRIPTOR_FIELD in tosca_meta: |
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return tosca_meta[SOLPackage._METADATA_DESCRIPTOR_FIELD] |
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|
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error_msg = "Error: no {} entry found on {}".format( |
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SOLPackage._METADATA_DESCRIPTOR_FIELD, SOLPackage._METADATA_FILE_PATH |
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) |
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raise SOLPackageException(error_msg) |
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def get_manifest_location(self): |
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"""Return the VNF/NS manifest location as a relative path from the package root.""" |
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for tosca_meta in self._package_metadata: |
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if SOLPackage._METADATA_MANIFEST_FIELD in tosca_meta: |
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return tosca_meta[SOLPackage._METADATA_MANIFEST_FIELD] |
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|
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raise SOLPackageException("No manifest file defined for this package") |
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