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# Copyright (C) 2018-2020 The Software Heritage developers
# See the AUTHORS file at the top-level directory of this distribution
# License: GNU General Public License version 3, or any later version
# See top-level LICENSE file for more information
from abc import ABCMeta, abstractmethod
from enum import Enum
from typing import Any, Dict, Iterable, Optional, Tuple, TypeVar, Union
import attr
from attrs_strict import type_validator
import dateutil.parser
import iso8601
from .collections import ImmutableDict
from .hashutil import DEFAULT_ALGORITHMS, MultiHash, hash_to_bytes
from .identifiers import (
normalize_timestamp,
parse_swhid,

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class MissingData(Exception):
"""Raised by `Content.with_data` when it has no way of fetching the
data (but not when fetching the data fails)."""

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pass
KeyType = Union[Dict[str, str], Dict[str, bytes], bytes]
"""The type returned by BaseModel.unique_key()."""
# TODO: Limit this to 20 bytes
Sha1Git = bytes
KT = TypeVar("KT")
VT = TypeVar("VT")
def freeze_optional_dict(
d: Union[None, Dict[KT, VT], ImmutableDict[KT, VT]] # type: ignore
) -> Optional[ImmutableDict[KT, VT]]:
if isinstance(d, dict):
return ImmutableDict(d)
else:
return d
def dictify(value):
"Helper function used by BaseModel.to_dict()"
if isinstance(value, BaseModel):
return value.to_dict()
elif isinstance(value, SWHID):
return str(value)
elif isinstance(value, Enum):
return value.value
elif isinstance(value, (dict, ImmutableDict)):
return {k: dictify(v) for k, v in value.items()}
elif isinstance(value, tuple):
return tuple(dictify(v) for v in value)
else:
return value
ModelType = TypeVar("ModelType", bound="BaseModel")
class BaseModel:
"""Base class for SWH model classes.
Provides serialization/deserialization to/from Python dictionaries,
that are suitable for JSON/msgpack-like formats."""
def to_dict(self):
"""Wrapper of `attr.asdict` that can be overridden by subclasses
that have special handling of some of the fields."""
return dictify(attr.asdict(self, recurse=False))
@classmethod
def from_dict(cls, d):
"""Takes a dictionary representing a tree of SWH objects, and
recursively builds the corresponding objects."""
return cls(**d)
def anonymize(self: ModelType) -> Optional[ModelType]:
"""Returns an anonymized version of the object, if needed.
If the object model does not need/support anonymization, returns None.
"""
return None
def unique_key(self) -> KeyType:
"""Returns a unique key for this object, that can be used for
deduplication."""
raise NotImplementedError(f"unique_key for {self}")
class HashableObject(metaclass=ABCMeta):
"""Mixin to automatically compute object identifier hash when
the associated model is instantiated."""
@abstractmethod
def compute_hash(self) -> bytes:
"""Derived model classes must implement this to compute
the object hash.
This method is called by the object initialization if the `id`
attribute is set to an empty value.
"""
pass
def __attrs_post_init__(self):
if not self.id:
obj_id = self.compute_hash()
def unique_key(self) -> KeyType:
return self.id # type: ignore
class Person(BaseModel):
"""Represents the author/committer of a revision or release."""
object_type: Final = "person"
fullname = attr.ib(type=bytes, validator=type_validator())
name = attr.ib(type=Optional[bytes], validator=type_validator())
email = attr.ib(type=Optional[bytes], validator=type_validator())
@classmethod
def from_fullname(cls, fullname: bytes):
"""Returns a Person object, by guessing the name and email from the
fullname, in the `name <email>` format.
The fullname is left unchanged."""
if fullname is None:
name: Optional[bytes]
email: Optional[bytes]
try:
except ValueError:
name = fullname
email = None
else:
raw_name = fullname[:open_bracket]
if not raw_name:
name = None
else:
name = raw_name.strip()
try:
except ValueError:
email = raw_email
else:
email = raw_email[:close_bracket]
return Person(name=name or None, email=email or None, fullname=fullname,)
def anonymize(self) -> "Person":
"""Returns an anonymized version of the Person object.
Anonymization is simply a Person which fullname is the hashed, with unset name
or email.
"""
return Person(fullname=sha256(self.fullname).digest(), name=None, email=None,)
class Timestamp(BaseModel):
"""Represents a naive timestamp from a VCS."""
object_type: Final = "timestamp"
seconds = attr.ib(type=int, validator=type_validator())
microseconds = attr.ib(type=int, validator=type_validator())
@seconds.validator
def check_seconds(self, attribute, value):
"""Check that seconds fit in a 64-bits signed integer."""
if not (-(2 ** 63) <= value < 2 ** 63):
raise ValueError("Seconds must be a signed 64-bits integer.")
@microseconds.validator
def check_microseconds(self, attribute, value):
"""Checks that microseconds are positive and < 1000000."""
if not (0 <= value < 10 ** 6):
raise ValueError("Microseconds must be in [0, 1000000[.")
class TimestampWithTimezone(BaseModel):
"""Represents a TZ-aware timestamp from a VCS."""
object_type: Final = "timestamp_with_timezone"
timestamp = attr.ib(type=Timestamp, validator=type_validator())
offset = attr.ib(type=int, validator=type_validator())
negative_utc = attr.ib(type=bool, validator=type_validator())
@offset.validator
def check_offset(self, attribute, value):
"""Checks the offset is a 16-bits signed integer (in theory, it
should always be between -14 and +14 hours)."""
# max 14 hours offset in theory, but you never know what
# you'll find in the wild...
@negative_utc.validator
def check_negative_utc(self, attribute, value):
if self.offset and value:
raise ValueError("negative_utc can only be True is offset=0")
@classmethod
def from_dict(cls, obj: Union[Dict, datetime.datetime, int]):
"""Builds a TimestampWithTimezone from any of the formats
accepted by :func:`swh.model.normalize_timestamp`."""
# TODO: this accept way more types than just dicts; find a better
# name
d = normalize_timestamp(obj)
return cls(
timestamp=Timestamp.from_dict(d["timestamp"]),
offset=d["offset"],
negative_utc=d["negative_utc"],
)
@classmethod
def from_datetime(cls, dt: datetime.datetime):
return cls.from_dict(dt)
@classmethod
def from_iso8601(cls, s):
"""Builds a TimestampWithTimezone from an ISO8601-formatted string.
"""
dt = iso8601.parse_date(s)
tstz = cls.from_datetime(dt)
tstz = attr.evolve(tstz, negative_utc=True)
return tstz
class Origin(BaseModel):
"""Represents a software source: a VCS and an URL."""
object_type: Final = "origin"
def unique_key(self) -> KeyType:
return {"url": self.url}
class OriginVisit(BaseModel):
"""Represents an origin visit with a given type at a given point in time, by a
SWH loader."""
object_type: Final = "origin_visit"
origin = attr.ib(type=str, validator=type_validator())
date = attr.ib(type=datetime.datetime, validator=type_validator())
type = attr.ib(type=str, validator=type_validator())
"""Should not be set before calling 'origin_visit_add()'."""
visit = attr.ib(type=Optional[int], validator=type_validator(), default=None)
@date.validator
def check_date(self, attribute, value):
"""Checks the date has a timezone."""
if value is not None and value.tzinfo is None:
raise ValueError("date must be a timezone-aware datetime.")
def to_dict(self):
"""Serializes the date as a string and omits the visit id if it is
`None`."""
ov = super().to_dict()
return ov
def unique_key(self) -> KeyType:
return {"origin": self.origin, "date": str(self.date)}
class OriginVisitStatus(BaseModel):
"""Represents a visit update of an origin at a given point in time.
"""
object_type: Final = "origin_visit_status"
origin = attr.ib(type=str, validator=type_validator())
visit = attr.ib(type=int, validator=type_validator())
date = attr.ib(type=datetime.datetime, validator=type_validator())
status = attr.ib(
type=str,
validator=attr.validators.in_(["created", "ongoing", "full", "partial"]),
)
snapshot = attr.ib(type=Optional[Sha1Git], validator=type_validator())
# Type is optional be to able to use it before adding it to the database model
type = attr.ib(type=Optional[str], validator=type_validator(), default=None)
metadata = attr.ib(
type=Optional[ImmutableDict[str, object]],
validator=type_validator(),
converter=freeze_optional_dict,
default=None,
@date.validator
def check_date(self, attribute, value):
"""Checks the date has a timezone."""
if value is not None and value.tzinfo is None:
raise ValueError("date must be a timezone-aware datetime.")
def unique_key(self) -> KeyType:
return {"origin": self.origin, "visit": str(self.visit), "date": str(self.date)}
class TargetType(Enum):
"""The type of content pointed to by a snapshot branch. Usually a
revision or an alias."""
CONTENT = "content"
DIRECTORY = "directory"
REVISION = "revision"
RELEASE = "release"
SNAPSHOT = "snapshot"
ALIAS = "alias"
class ObjectType(Enum):
"""The type of content pointed to by a release. Usually a revision"""
CONTENT = "content"
DIRECTORY = "directory"
REVISION = "revision"
RELEASE = "release"
SNAPSHOT = "snapshot"
class SnapshotBranch(BaseModel):
"""Represents one of the branches of a snapshot."""
object_type: Final = "snapshot_branch"
target = attr.ib(type=bytes, validator=type_validator())
target_type = attr.ib(type=TargetType, validator=type_validator())
@target.validator
def check_target(self, attribute, value):
"""Checks the target type is not an alias, checks the target is a
valid sha1_git."""
if self.target_type != TargetType.ALIAS and self.target is not None:
if len(value) != 20:
raise ValueError("Wrong length for bytes identifier: %d" % len(value))
@classmethod
def from_dict(cls, d):
return cls(target=d["target"], target_type=TargetType(d["target_type"]))
class Snapshot(HashableObject, BaseModel):
"""Represents the full state of an origin at a given point in time."""
object_type: Final = "snapshot"
branches = attr.ib(
type=ImmutableDict[bytes, Optional[SnapshotBranch]],
validator=type_validator(),
converter=freeze_optional_dict,
)
id = attr.ib(type=Sha1Git, validator=type_validator(), default=b"")
def compute_hash(self) -> bytes:
return hash_to_bytes(snapshot_identifier(self.to_dict()))
@classmethod
def from_dict(cls, d):
d = d.copy()
return cls(
branches=ImmutableDict(
(name, SnapshotBranch.from_dict(branch) if branch else None)
class Release(HashableObject, BaseModel):
object_type: Final = "release"
name = attr.ib(type=bytes, validator=type_validator())
message = attr.ib(type=Optional[bytes], validator=type_validator())
target = attr.ib(type=Optional[Sha1Git], validator=type_validator())
target_type = attr.ib(type=ObjectType, validator=type_validator())
synthetic = attr.ib(type=bool, validator=type_validator())
author = attr.ib(type=Optional[Person], validator=type_validator(), default=None)
date = attr.ib(
type=Optional[TimestampWithTimezone], validator=type_validator(), default=None
)
metadata = attr.ib(
type=Optional[ImmutableDict[str, object]],
validator=type_validator(),
converter=freeze_optional_dict,
default=None,
)
id = attr.ib(type=Sha1Git, validator=type_validator(), default=b"")
def compute_hash(self) -> bytes:
return hash_to_bytes(release_identifier(self.to_dict()))
@author.validator
def check_author(self, attribute, value):
"""If the author is `None`, checks the date is `None` too."""
if self.author is None and self.date is not None:
raise ValueError("release date must be None if author is None.")
def to_dict(self):
return rel
@classmethod
def from_dict(cls, d):
d = d.copy()
if d.get("author"):
d["author"] = Person.from_dict(d["author"])
if d.get("date"):
d["date"] = TimestampWithTimezone.from_dict(d["date"])
return cls(target_type=ObjectType(d.pop("target_type")), **d)
def anonymize(self) -> "Release":
"""Returns an anonymized version of the Release object.
Anonymization consists in replacing the author with an anonymized Person object.
"""
author = self.author and self.author.anonymize()
return attr.evolve(self, author=author)
class RevisionType(Enum):
GIT = "git"
TAR = "tar"
DSC = "dsc"
SUBVERSION = "svn"
MERCURIAL = "hg"
def tuplify_extra_headers(value: Iterable):
return tuple((k, v) for k, v in value)
class Revision(HashableObject, BaseModel):
object_type: Final = "revision"
message = attr.ib(type=Optional[bytes], validator=type_validator())
author = attr.ib(type=Person, validator=type_validator())
committer = attr.ib(type=Person, validator=type_validator())
date = attr.ib(type=Optional[TimestampWithTimezone], validator=type_validator())
committer_date = attr.ib(
type=Optional[TimestampWithTimezone], validator=type_validator()
)
type = attr.ib(type=RevisionType, validator=type_validator())
directory = attr.ib(type=Sha1Git, validator=type_validator())
synthetic = attr.ib(type=bool, validator=type_validator())
metadata = attr.ib(
type=Optional[ImmutableDict[str, object]],
validator=type_validator(),
converter=freeze_optional_dict,
default=None,
parents = attr.ib(type=Tuple[Sha1Git, ...], validator=type_validator(), default=())
id = attr.ib(type=Sha1Git, validator=type_validator(), default=b"")
extra_headers = attr.ib(
type=Tuple[Tuple[bytes, bytes], ...],
validator=type_validator(),
converter=tuplify_extra_headers,
default=(),
)
def __attrs_post_init__(self):
super().__attrs_post_init__()
# ensure metadata is a deep copy of whatever was given, and if needed
# extract extra_headers from there
if self.metadata:
metadata = self.metadata
if not self.extra_headers and "extra_headers" in metadata:
(extra_headers, metadata) = metadata.copy_pop("extra_headers")
object.__setattr__(
self, "extra_headers", tuplify_extra_headers(extra_headers),
)
attr.validate(self)
object.__setattr__(self, "metadata", metadata)
def compute_hash(self) -> bytes:
return hash_to_bytes(revision_identifier(self.to_dict()))
@classmethod
def from_dict(cls, d):
if date:
date = TimestampWithTimezone.from_dict(date)
committer_date = TimestampWithTimezone.from_dict(committer_date)
return cls(
author=Person.from_dict(d.pop("author")),
committer=Person.from_dict(d.pop("committer")),
date=date,
committer_date=committer_date,
parents=tuple(d.pop("parents")), # for BW compat
def anonymize(self) -> "Revision":
"""Returns an anonymized version of the Revision object.
Anonymization consists in replacing the author and committer with an anonymized
Person object.
"""
return attr.evolve(
self, author=self.author.anonymize(), committer=self.committer.anonymize()
)
class DirectoryEntry(BaseModel):
object_type: Final = "directory_entry"
name = attr.ib(type=bytes, validator=type_validator())
type = attr.ib(type=str, validator=attr.validators.in_(["file", "dir", "rev"]))
target = attr.ib(type=Sha1Git, validator=type_validator())
perms = attr.ib(type=int, validator=type_validator())
"""Usually one of the values of `swh.model.from_disk.DentryPerms`."""
class Directory(HashableObject, BaseModel):
object_type: Final = "directory"
entries = attr.ib(type=Tuple[DirectoryEntry, ...], validator=type_validator())
id = attr.ib(type=Sha1Git, validator=type_validator(), default=b"")
def compute_hash(self) -> bytes:
return hash_to_bytes(directory_identifier(self.to_dict()))
@classmethod
def from_dict(cls, d):
d = d.copy()
return cls(
entries=tuple(
DirectoryEntry.from_dict(entry) for entry in d.pop("entries")
),
**d,
class BaseContent(BaseModel):

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status = attr.ib(
type=str, validator=attr.validators.in_(["visible", "hidden", "absent"])
)

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@staticmethod
def _hash_data(data: bytes):
"""Hash some data, returning most of the fields of a content object"""
d = MultiHash.from_data(data).digest()
return d
@classmethod
def from_dict(cls, d, use_subclass=True):
if use_subclass:
# Chooses a subclass to instantiate instead.
return SkippedContent.from_dict(d)
else:
return Content.from_dict(d)
else:
return super().from_dict(d)
def get_hash(self, hash_name):
if hash_name not in DEFAULT_ALGORITHMS:
raise ValueError("{} is not a valid hash name.".format(hash_name))
return getattr(self, hash_name)
def hashes(self) -> Dict[str, bytes]:
"""Returns a dictionary {hash_name: hash_value}"""
return {algo: getattr(self, algo) for algo in DEFAULT_ALGORITHMS}
class Content(BaseContent):
object_type: Final = "content"
sha1 = attr.ib(type=bytes, validator=type_validator())
sha1_git = attr.ib(type=Sha1Git, validator=type_validator())
sha256 = attr.ib(type=bytes, validator=type_validator())
blake2s256 = attr.ib(type=bytes, validator=type_validator())
length = attr.ib(type=int, validator=type_validator())
status = attr.ib(
type=str,
validator=attr.validators.in_(["visible", "hidden"]),
default="visible",
)

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data = attr.ib(type=Optional[bytes], validator=type_validator(), default=None)
ctime = attr.ib(
type=Optional[datetime.datetime],
validator=type_validator(),
default=None,
eq=False,
@length.validator
def check_length(self, attribute, value):
"""Checks the length is positive."""
@ctime.validator
def check_ctime(self, attribute, value):
"""Checks the ctime has a timezone."""
if value is not None and value.tzinfo is None:
raise ValueError("ctime must be a timezone-aware datetime.")
def to_dict(self):
content = super().to_dict()
if content["ctime"] is None:
del content["ctime"]
return content
@classmethod
def from_data(cls, data, status="visible", ctime=None) -> "Content":
"""Generate a Content from a given `data` byte string.
This populates the Content with the hashes and length for the data
passed as argument, as well as the data itself.
"""
d = cls._hash_data(data)
return cls(**d)
@classmethod
def from_dict(cls, d):
d = d.copy()
return super().from_dict(d, use_subclass=False)

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"""Loads the `data` attribute; meaning that it is guaranteed not to
be None after this call.
This call is almost a no-op, but subclasses may overload this method
to lazy-load data (eg. from disk or objstorage)."""
if self.data is None:

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return self
def unique_key(self) -> KeyType:
return self.sha1 # TODO: use a dict of hashes
class SkippedContent(BaseContent):
object_type: Final = "skipped_content"
sha1 = attr.ib(type=Optional[bytes], validator=type_validator())
sha1_git = attr.ib(type=Optional[Sha1Git], validator=type_validator())
sha256 = attr.ib(type=Optional[bytes], validator=type_validator())
blake2s256 = attr.ib(type=Optional[bytes], validator=type_validator())
length = attr.ib(type=Optional[int], validator=type_validator())
status = attr.ib(type=str, validator=attr.validators.in_(["absent"]))
reason = attr.ib(type=Optional[str], validator=type_validator(), default=None)
origin = attr.ib(type=Optional[str], validator=type_validator(), default=None)
ctime = attr.ib(
type=Optional[datetime.datetime],
validator=type_validator(),
default=None,
eq=False,
@reason.validator
def check_reason(self, attribute, value):
"""Checks the reason is full if status != absent."""
assert self.reason == value
if value is None:
raise ValueError("Must provide a reason if content is absent.")
@length.validator
def check_length(self, attribute, value):
"""Checks the length is positive or -1."""
@ctime.validator
def check_ctime(self, attribute, value):
"""Checks the ctime has a timezone."""
if value is not None and value.tzinfo is None:
raise ValueError("ctime must be a timezone-aware datetime.")
def to_dict(self):
content = super().to_dict()
if content["ctime"] is None:
del content["ctime"]
return content
@classmethod
def from_data(
cls, data: bytes, reason: str, ctime: Optional[datetime.datetime] = None
) -> "SkippedContent":
"""Generate a SkippedContent from a given `data` byte string.
This populates the SkippedContent with the hashes and length for the
data passed as argument.
You can use `attr.evolve` on such a generated content to nullify some
of its attributes, e.g. for tests.
"""
d = cls._hash_data(data)
del d["data"]
d["status"] = "absent"
d["reason"] = reason
d["ctime"] = ctime
return cls(**d)
@classmethod
def from_dict(cls, d):
raise ValueError('SkippedContent has no "data" attribute %r' % d)
return super().from_dict(d2, use_subclass=False)
def unique_key(self) -> KeyType:
return self.hashes()
DEPOSIT_CLIENT = "deposit_client"
FORGE = "forge"
REGISTRY = "registry"
class MetadataAuthority(BaseModel):
"""Represents an entity that provides metadata about an origin or
software artifact."""
object_type: Final = "metadata_authority"
type = attr.ib(type=MetadataAuthorityType, validator=type_validator())
url = attr.ib(type=str, validator=type_validator())
metadata = attr.ib(
type=Optional[ImmutableDict[str, Any]],
default=None,
validator=type_validator(),
converter=freeze_optional_dict,
def to_dict(self):
d = super().to_dict()
if d["metadata"] is None:
del d["metadata"]
return d
@classmethod
def from_dict(cls, d):
d["type"] = MetadataAuthorityType(d["type"])
return super().from_dict(d)
def unique_key(self) -> KeyType:
return {"type": self.type.value, "url": self.url}
class MetadataFetcher(BaseModel):
"""Represents a software component used to fetch metadata from a metadata
authority, and ingest them into the Software Heritage archive."""
object_type: Final = "metadata_fetcher"
name = attr.ib(type=str, validator=type_validator())
version = attr.ib(type=str, validator=type_validator())
metadata = attr.ib(
type=Optional[ImmutableDict[str, Any]],
default=None,
validator=type_validator(),
converter=freeze_optional_dict,
def to_dict(self):
d = super().to_dict()
if d["metadata"] is None:
del d["metadata"]
return d
def unique_key(self) -> KeyType:
return {"name": self.name, "version": self.version}
class MetadataTargetType(Enum):
"""The type of object extrinsic metadata refer to."""
CONTENT = "content"
DIRECTORY = "directory"
REVISION = "revision"
RELEASE = "release"
SNAPSHOT = "snapshot"
ORIGIN = "origin"
class RawExtrinsicMetadata(BaseModel):
object_type: Final = "raw_extrinsic_metadata"
# target object
type = attr.ib(type=MetadataTargetType, validator=type_validator())
target = attr.ib(type=Union[str, SWHID], validator=type_validator())
"""URL if type=MetadataTargetType.ORIGIN, else core SWHID"""
# source
discovery_date = attr.ib(type=datetime.datetime, validator=type_validator())
authority = attr.ib(type=MetadataAuthority, validator=type_validator())
fetcher = attr.ib(type=MetadataFetcher, validator=type_validator())
# the metadata itself
format = attr.ib(type=str, validator=type_validator())
metadata = attr.ib(type=bytes, validator=type_validator())
# context
origin = attr.ib(type=Optional[str], default=None, validator=type_validator())
visit = attr.ib(type=Optional[int], default=None, validator=type_validator())
snapshot = attr.ib(type=Optional[SWHID], default=None, validator=type_validator())
release = attr.ib(type=Optional[SWHID], default=None, validator=type_validator())
revision = attr.ib(type=Optional[SWHID], default=None, validator=type_validator())
path = attr.ib(type=Optional[bytes], default=None, validator=type_validator())
directory = attr.ib(type=Optional[SWHID], default=None, validator=type_validator())
@target.validator
def check_target(self, attribute, value):
if self.type == MetadataTargetType.ORIGIN:
if isinstance(value, SWHID) or value.startswith("swh:"):
raise ValueError(
"Got SWHID as target for origin metadata (expected an URL)."
self._check_swhid(self.type.value, value)
@discovery_date.validator
def check_discovery_date(self, attribute, value):
"""Checks the discovery_date has a timezone."""
if value is not None and value.tzinfo is None:
raise ValueError("discovery_date must be a timezone-aware datetime.")
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@origin.validator
def check_origin(self, attribute, value):
if value is None:
return
if self.type not in (
MetadataTargetType.SNAPSHOT,
MetadataTargetType.RELEASE,
MetadataTargetType.REVISION,
MetadataTargetType.DIRECTORY,
MetadataTargetType.CONTENT,
):
raise ValueError(
f"Unexpected 'origin' context for {self.type.value} object: {value}"
)
if value.startswith("swh:"):
# Technically this is valid; but:
# 1. SWHIDs are URIs, not URLs
# 2. if a SWHID gets here, it's very likely to be a mistake
# (and we can remove this check if it turns out there is a
# legitimate use for it).
raise ValueError(f"SWHID used as context origin URL: {value}")
@visit.validator
def check_visit(self, attribute, value):
if value is None:
return
if self.type not in (
MetadataTargetType.SNAPSHOT,
MetadataTargetType.RELEASE,
MetadataTargetType.REVISION,
MetadataTargetType.DIRECTORY,
MetadataTargetType.CONTENT,
):
raise ValueError(
f"Unexpected 'visit' context for {self.type.value} object: {value}"
)
if self.origin is None:
raise ValueError("'origin' context must be set if 'visit' is.")
if value <= 0:
raise ValueError("Nonpositive visit id")
@snapshot.validator
def check_snapshot(self, attribute, value):
if value is None:
return
if self.type not in (
MetadataTargetType.RELEASE,
MetadataTargetType.REVISION,
MetadataTargetType.DIRECTORY,
MetadataTargetType.CONTENT,
):
raise ValueError(
f"Unexpected 'snapshot' context for {self.type.value} object: {value}"
)
self._check_swhid("snapshot", value)
@release.validator
def check_release(self, attribute, value):
if value is None:
return
if self.type not in (
MetadataTargetType.REVISION,
MetadataTargetType.DIRECTORY,
MetadataTargetType.CONTENT,
):
raise ValueError(
f"Unexpected 'release' context for {self.type.value} object: {value}"
)
self._check_swhid("release", value)
@revision.validator
def check_revision(self, attribute, value):
if value is None:
return
if self.type not in (MetadataTargetType.DIRECTORY, MetadataTargetType.CONTENT,):
raise ValueError(
f"Unexpected 'revision' context for {self.type.value} object: {value}"
)
self._check_swhid("revision", value)