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tuf.api: instantiate objects from the JSON

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Signed-off-by: Joshua Lock <jlock@vmware.com>
This commit is contained in:
Joshua Lock 2020-07-02 23:06:13 +01:00
parent 3cc98ae2d5
commit 1daefa456b
1 changed files with 47 additions and 23 deletions
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70
tuf/api/metadata.py
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@ -43,24 +43,37 @@ def __init__(self, consistent_snapshot: bool = True, expiration: relativedelta =
assert version >= 1, f'{version} < 1'
self.version = version
self._signed = {}
self._signatures = []
# And you would use this method to populate it from a file.
def read_from_json(self, filename: str, storage_backend: StorageBackendInterface = None) -> None:
self._signable = load_json_file(filename, storage_backend)
@classmethod
def read_from_json(cls, filename: str, storage_backend: StorageBackendInterface = None) -> None:
signable = load_json_file(filename, storage_backend)
tuf.formats.SIGNABLE_SCHEMA.check_match(signable)
self._signatures = signable['signatures']
self._signed = signable['signed']
signatures = signable['signatures']
signed = signable['signed']
# TODO: replace with dateutil.parser.parse?
self.expiration = iso8601.parse_date(self._signed['expires'])
self.version = self._signed['version']
expiration = iso8601.parse_date(signed['expires'])
version = signed['version']
fn, fn_ver = _strip_version_number(filename, True)
if fn_ver:
assert fn_ver == self.version, f'{fn_ver} != {self.version}'
self.consistent_snapshot = True
consistent_snapshot = True
else:
self.consistent_snapshot = False
consistent_snapshot = False
metadata = cls(consistent_snapshot=consistent_snapshot,
expiration=expiration,
version=version)
metadata._signatures = signatures
metadata._signed = signed
return metadata
@property
def signable(self) -> JsonDict:
@ -100,7 +113,7 @@ def update_signature(signatures, keyid, signature):
signatures.append(keyid_signature)
signed = self.signed
signatures = self.signatures
signatures = self._signatures
for key in self.keyring.keys:
signature = key.sign(signed)
@ -140,10 +153,14 @@ def __init__(self, consistent_snapshot: bool = True, expiration: relativedelta =
super().__init__(consistent_snapshot, expiration, keyring, version)
self.snapshot_fileinfo = {}
def read_from_json(self, filename: str) -> None:
super().read_from_json(filename)
self.snapshot_fileinfo = self._signed['meta']
tuf.formats.TIMESTAMP_SCHEMA.check_match(self.signed)
@classmethod
def read_from_json(cls, filename: str) -> None:
md = Metadata.read_from_json(filename)
timestamp = cls(md.consistent_snapshot, md.expiration, md.keyring, md.version)
timestamp.snapshot_fileinfo = md._signed['meta']
tuf.formats.TIMESTAMP_SCHEMA.check_match(timestamp.signed)
timestamp._signatures = md._signatures
return timestamp
@property
def signable(self) -> JsonDict:
@ -164,15 +181,19 @@ def __init__(self, consistent_snapshot: bool = True, expiration: relativedelta =
super().__init__(consistent_snapshot, expiration, keyring, version)
self.targets_fileinfo = {}
def read_from_json(self, filename: str) -> None:
super().read_from_json(filename)
meta = self._signed['meta']
@classmethod
def read_from_json(cls, filename: str) -> None:
md = Metadata.read_from_json(filename)
snapshot = cls(md.consistent_snapshot, md.expiration, md.keyring, md.version)
meta = md._signed['meta']
for target_role in meta:
version = meta[target_role]['version']
length = meta[target_role].get('length')
hashes = meta[target_role].get('hashes')
self.targets_fileinfo[target_role] = tuf.formats.make_metadata_fileinfo(version, length, hashes)
tuf.formats.SNAPSHOT_SCHEMA.check_match(self.signed)
snapshot.targets_fileinfo[target_role] = tuf.formats.make_metadata_fileinfo(version, length, hashes)
tuf.formats.SNAPSHOT_SCHEMA.check_match(snapshot.signed)
snapshot._signatures = md._signatures
return snapshot
@property
def signable(self):
@ -190,11 +211,14 @@ def __init__(self, consistent_snapshot: bool = True, expiration: relativedelta =
self.targets = {}
self.delegations = {}
def read_from_json(self, filename: str) -> None:
super().read_from_json(filename)
self.targets = self._signed['targets']
self.delegations = self._signed.get('delegations', {})
tuf.formats.TARGETS_SCHEMA.check_match(self.signed)
@classmethod
def read_from_json(cls, filename: str) -> None:
targets = Metadata.read_from_json(filename)
targets.targets = self._signed['targets']
targets.delegations = self._signed.get('delegations', {})
tuf.formats.TARGETS_SCHEMA.check_match(targets.signed)
targets._signatures = md._signatures
return targets
@property
def signable(self):