Differential D5118 Diff 18341 swh/model/identifiers.py

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swh/model/identifiers.py

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from .collections import ImmutableDict		from .collections import ImmutableDict
from .exceptions import ValidationError		from .exceptions import ValidationError
from .fields.hashes import validate_sha1		from .fields.hashes import validate_sha1
from .hashutil import MultiHash, hash_git_data, hash_to_bytes, hash_to_hex		from .hashutil import MultiHash, hash_git_data, hash_to_bytes, hash_to_hex


class ObjectType(enum.Enum):		class ObjectType(enum.Enum):
"""Possible object types of a QualifiedSWHID.		"""Possible object types of a QualifiedSWHID or CoreSWHID.

The values of each variant is what is used in the SWHID's string representation."""		The values of each variant is what is used in the SWHID's string representation."""

ORIGIN = "ori"
SNAPSHOT = "snp"		SNAPSHOT = "snp"
REVISION = "rev"		REVISION = "rev"
RELEASE = "rel"		RELEASE = "rel"
DIRECTORY = "dir"		DIRECTORY = "dir"
CONTENT = "cnt"		CONTENT = "cnt"


		class ExtendedObjectType(enum.Enum):
		"""Possible object types of an ExtendedSWHID.

		The variants are a superset of :cls:`ObjectType`'s"""

		SNAPSHOT = "snp"
		REVISION = "rev"
		RELEASE = "rel"
		DIRECTORY = "dir"
		CONTENT = "cnt"
		ORIGIN = "ori"
		zackUnsubmitted Not Done Inline Actions "RAW_EXTRINSIC_METADATA" is a horribly long mouthful. (But I don't have better suggestions at the moment...) zack: "RAW_EXTRINSIC_METADATA" is a horribly long mouthful. (But I don't have better suggestions at…
		vlorentzAuthorUnsubmitted Done Inline Actions I agree, but we don't have a better name; and that one is already used in various places vlorentz: I agree, but we don't have a better name; and that one is already used in various places
		RAW_EXTRINSIC_METADATA = "emd"


# The following are deprecated aliases of the variants defined in ObjectType		# The following are deprecated aliases of the variants defined in ObjectType
# while transitioning from SWHID to QualifiedSWHID		# while transitioning from SWHID to QualifiedSWHID
ORIGIN = "origin"		ORIGIN = "origin"
SNAPSHOT = "snapshot"		SNAPSHOT = "snapshot"
REVISION = "revision"		REVISION = "revision"
RELEASE = "release"		RELEASE = "release"
DIRECTORY = "directory"		DIRECTORY = "directory"
CONTENT = "content"		CONTENT = "content"
		RAW_EXTRINSIC_METADATA = "raw_extrinsic_metadata"

SWHID_NAMESPACE = "swh"		SWHID_NAMESPACE = "swh"
SWHID_VERSION = 1		SWHID_VERSION = 1
SWHID_TYPES = ["ori", "snp", "rel", "rev", "dir", "cnt"]		SWHID_TYPES = ["snp", "rel", "rev", "dir", "cnt"]
		EXTENDED_SWHID_TYPES = SWHID_TYPES + ["ori", "emd"]
SWHID_SEP = ":"		SWHID_SEP = ":"
		olasdUnsubmitted Not Done Inline Actions Could we use the enum values instead of duplicating these vars? olasd: Could we use the enum values instead of duplicating these vars?
SWHID_CTXT_SEP = ";"		SWHID_CTXT_SEP = ";"
SWHID_QUALIFIERS = {"origin", "anchor", "visit", "path", "lines"}		SWHID_QUALIFIERS = {"origin", "anchor", "visit", "path", "lines"}

SWHID_RE_RAW = (		SWHID_RE_RAW = (
f"(?P<namespace>{SWHID_NAMESPACE})"		f"(?P<namespace>{SWHID_NAMESPACE})"
f"{SWHID_SEP}(?P<scheme_version>{SWHID_VERSION})"		f"{SWHID_SEP}(?P<scheme_version>{SWHID_VERSION})"
f"{SWHID_SEP}(?P<object_type>{'\|'.join(SWHID_TYPES)})"		f"{SWHID_SEP}(?P<object_type>{'\|'.join(EXTENDED_SWHID_TYPES)})"
f"{SWHID_SEP}(?P<object_id>[0-9a-f]{{40}})"		f"{SWHID_SEP}(?P<object_id>[0-9a-f]{{40}})"
f"({SWHID_CTXT_SEP}(?P<qualifiers>\\S+))?"		f"({SWHID_CTXT_SEP}(?P<qualifiers>\\S+))?"
)		)
SWHID_RE = re.compile(SWHID_RE_RAW)		SWHID_RE = re.compile(SWHID_RE_RAW)


@lru_cache()		@lru_cache()
def identifier_to_bytes(identifier):		def identifier_to_bytes(identifier):
▲ Show 20 Lines • Show All 627 Lines • ▼ Show 20 Lines	def origin_identifier(origin):
"""Return the intrinsic identifier for an origin.		"""Return the intrinsic identifier for an origin.

An origin's identifier is the sha1 checksum of the entire origin URL		An origin's identifier is the sha1 checksum of the entire origin URL

"""		"""
return hashlib.sha1(origin["url"].encode("utf-8")).hexdigest()		return hashlib.sha1(origin["url"].encode("utf-8")).hexdigest()


_object_type_map = {		_object_type_map = {
ORIGIN: {"short_name": "ori", "key_id": "id"},		ORIGIN: {"short_name": "ori", "key_id": "id"},
SNAPSHOT: {"short_name": "snp", "key_id": "id"},		SNAPSHOT: {"short_name": "snp", "key_id": "id"},
RELEASE: {"short_name": "rel", "key_id": "id"},		RELEASE: {"short_name": "rel", "key_id": "id"},
REVISION: {"short_name": "rev", "key_id": "id"},		REVISION: {"short_name": "rev", "key_id": "id"},
DIRECTORY: {"short_name": "dir", "key_id": "id"},		DIRECTORY: {"short_name": "dir", "key_id": "id"},
CONTENT: {"short_name": "cnt", "key_id": "sha1_git"},		CONTENT: {"short_name": "cnt", "key_id": "sha1_git"},
		RAW_EXTRINSIC_METADATA: {"short_name": "emd", "key_id": "id"},
}		}

_swhid_type_map = {		_swhid_type_map = {
"ori": ORIGIN,		"ori": ORIGIN,
"snp": SNAPSHOT,		"snp": SNAPSHOT,
"rel": RELEASE,		"rel": RELEASE,
"rev": REVISION,		"rev": REVISION,
"dir": DIRECTORY,		"dir": DIRECTORY,
"cnt": CONTENT,		"cnt": CONTENT,
		"emd": RAW_EXTRINSIC_METADATA,
}		}
		olasdUnsubmitted Not Done Inline Actions These two dicts look like fairly easy candidates for deletion (in a further diff)? olasd: These two dicts look like fairly easy candidates for deletion (in a further diff)?


@attr.s(frozen=True, kw_only=True)		@attr.s(frozen=True, kw_only=True)
class CoreSWHID:		class CoreSWHID:
"""		"""
Dataclass holding the relevant info associated to a SoftWare Heritage		Dataclass holding the relevant info associated to a SoftWare Heritage
persistent IDentifier (SWHID).		persistent IDentifier (SWHID).

▲ Show 20 Lines • Show All 256 Lines • ▼ Show 20 Lines	def from_string(cls, s: str) -> QualifiedSWHID:
"Invalid qualifier(s): {', '.join(invalid_qualifiers)}"		"Invalid qualifier(s): {', '.join(invalid_qualifiers)}"
)		)
try:		try:
return QualifiedSWHID(parts, qualifiers)		return QualifiedSWHID(parts, qualifiers)
except ValueError as e:		except ValueError as e:
raise ValidationError(*e.args) from None		raise ValidationError(*e.args) from None


		@attr.s(frozen=True, kw_only=True)
		class ExtendedSWHID:
		"""
		Dataclass holding the relevant info associated to a SoftWare Heritage
		persistent IDentifier (SWHID).

		It extends `CoreSWHID`, by allowing non-standard object types; and should
		only be used internally to Software Heritage.

		Raises:
		swh.model.exceptions.ValidationError: In case of invalid object type or id

		To get the raw SWHID string from an instance of this class,
		use the :func:`str` function:

		>>> swhid = ExtendedSWHID(
		... object_type=ExtendedObjectType.CONTENT,
		... object_id=bytes.fromhex('8ff44f081d43176474b267de5451f2c2e88089d0'),
		... )
		>>> str(swhid)
		'swh:1:cnt:8ff44f081d43176474b267de5451f2c2e88089d0'

		And vice-versa with :meth:`CoreSWHID.from_string`:

		>>> swhid == ExtendedSWHID.from_string(
		... "swh:1:cnt:8ff44f081d43176474b267de5451f2c2e88089d0"
		... )
		True
		"""

		namespace = attr.ib(type=str, default=SWHID_NAMESPACE)
		"""the namespace of the identifier, defaults to ``swh``"""

		scheme_version = attr.ib(type=int, default=SWHID_VERSION)
		"""the scheme version of the identifier, defaults to 1"""

		object_type = attr.ib(
		type=ExtendedObjectType,
		validator=type_validator(),
		converter=ExtendedObjectType,
		)
		"""the type of object the identifier points to"""

		object_id = attr.ib(type=bytes, validator=type_validator())
		"""object's identifier"""

		@namespace.validator
		def check_namespace(self, attribute, value):
		if value != SWHID_NAMESPACE:
		raise ValidationError(
		"Invalid SWHID: invalid namespace: %(namespace)s",
		params={"namespace": value},
		)

		@scheme_version.validator
		def check_scheme_version(self, attribute, value):
		if value != SWHID_VERSION:
		raise ValidationError(
		"Invalid SWHID: invalid version: %(version)s", params={"version": value}
		)

		@object_id.validator
		def check_object_id(self, attribute, value):
		if len(value) != 20:
		raise ValidationError(
		"Invalid SWHID: invalid checksum: %(object_id)s",
		params={"object_id": hash_to_hex(value)},
		)

		def __str__(self) -> str:
		return SWHID_SEP.join(
		[
		self.namespace,
		str(self.scheme_version),
		self.object_type.value,
		hash_to_hex(self.object_id),
		]
		)

		@classmethod
		def from_string(cls, s: str) -> ExtendedSWHID:
		parts = _parse_swhid(s)
		if parts.pop("qualifiers"):
		raise ValidationError("ExtendedSWHID does not support qualifiers.")
		return ExtendedSWHID(**parts)


@attr.s(frozen=True)		@attr.s(frozen=True)
class SWHID:		class SWHID:
"""		"""
Deprecated alternative to QualifiedSWHID.		Deprecated alternative to QualifiedSWHID.

Args:		Args:
namespace (str): the namespace of the identifier, defaults to ``swh``		namespace (str): the namespace of the identifier, defaults to ``swh``
scheme_version (int): the scheme version of the identifier,		scheme_version (int): the scheme version of the identifier,
▲ Show 20 Lines • Show All 195 Lines • Show Last 20 Lines