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import dataclasses
import re
import urllib.parse
from collections.abc import Mapping
from typing import TYPE_CHECKING, Any, Protocol, TypeVar
if TYPE_CHECKING: # pragma: no cover
import sys
from collections.abc import Collection
if sys.version_info >= (3, 11):
from typing import Self
else:
from typing_extensions import Self
__all__ = [
"ArchiveInfo",
"DirInfo",
"DirectUrl",
"DirectUrlValidationError",
"VcsInfo",
]
def __dir__() -> list[str]:
return __all__
_T = TypeVar("_T")
class _FromMappingProtocol(Protocol): # pragma: no cover
@classmethod
def _from_dict(cls, d: Mapping[str, Any]) -> Self: ...
_FromMappingProtocolT = TypeVar("_FromMappingProtocolT", bound=_FromMappingProtocol)
def _json_dict_factory(data: list[tuple[str, Any]]) -> dict[str, Any]:
return {key: value for key, value in data if value is not None}
def _get(d: Mapping[str, Any], expected_type: type[_T], key: str) -> _T | None:
"""Get a value from the dictionary and verify it's the expected type."""
if (value := d.get(key)) is None:
return None
if not isinstance(value, expected_type):
raise DirectUrlValidationError(
f"Unexpected type {type(value).__name__} "
f"(expected {expected_type.__name__})",
context=key,
)
return value
def _get_required(d: Mapping[str, Any], expected_type: type[_T], key: str) -> _T:
"""Get a required value from the dictionary and verify it's the expected type."""
if (value := _get(d, expected_type, key)) is None:
raise _DirectUrlRequiredKeyError(key)
return value
def _get_object(
d: Mapping[str, Any], target_type: type[_FromMappingProtocolT], key: str
) -> _FromMappingProtocolT | None:
"""Get a dictionary value from the dictionary and convert it to a dataclass."""
if (value := _get(d, Mapping, key)) is None: # type: ignore[type-abstract]
return None
try:
return target_type._from_dict(value)
except Exception as e:
raise DirectUrlValidationError(e, context=key) from e
_PEP610_USER_PASS_ENV_VARS_REGEX = re.compile(
r"^\$\{[A-Za-z0-9-_]+\}(:\$\{[A-Za-z0-9-_]+\})?$"
)
def _strip_auth_from_netloc(netloc: str, safe_user_passwords: Collection[str]) -> str:
if "@" not in netloc:
return netloc
user_pass, netloc_no_user_pass = netloc.split("@", 1)
if user_pass in safe_user_passwords:
return netloc
if _PEP610_USER_PASS_ENV_VARS_REGEX.match(user_pass):
return netloc
return netloc_no_user_pass
def _strip_url(url: str, safe_user_passwords: Collection[str]) -> str:
"""url with user:password part removed unless it is formed with
environment variables as specified in PEP 610, or it is a safe user:password
such as `git`.
"""
parsed_url = urllib.parse.urlsplit(url)
netloc = _strip_auth_from_netloc(parsed_url.netloc, safe_user_passwords)
return urllib.parse.urlunsplit(
(
parsed_url.scheme,
netloc,
parsed_url.path,
parsed_url.query,
parsed_url.fragment,
)
)
class DirectUrlValidationError(Exception):
"""Raised when when input data is not spec-compliant."""
context: str | None = None
message: str
def __init__(
self,
cause: str | Exception,
*,
context: str | None = None,
) -> None:
if isinstance(cause, DirectUrlValidationError):
if cause.context:
self.context = (
f"{context}.{cause.context}" if context else cause.context
)
else:
self.context = context # pragma: no cover
self.message = cause.message
else:
self.context = context
self.message = str(cause)
def __str__(self) -> str:
if self.context:
return f"{self.message} in {self.context!r}"
return self.message
class _DirectUrlRequiredKeyError(DirectUrlValidationError):
def __init__(self, key: str) -> None:
super().__init__("Missing required value", context=key)
@dataclasses.dataclass(frozen=True, init=False)
class VcsInfo:
vcs: str
commit_id: str
requested_revision: str | None = None
def __init__(
self,
*,
vcs: str,
commit_id: str,
requested_revision: str | None = None,
) -> None:
object.__setattr__(self, "vcs", vcs)
object.__setattr__(self, "commit_id", commit_id)
object.__setattr__(self, "requested_revision", requested_revision)
@classmethod
def _from_dict(cls, d: Mapping[str, Any]) -> Self:
# We can't validate vcs value because is not closed.
return cls(
vcs=_get_required(d, str, "vcs"),
requested_revision=_get(d, str, "requested_revision"),
commit_id=_get_required(d, str, "commit_id"),
)
@dataclasses.dataclass(frozen=True, init=False)
class ArchiveInfo:
hashes: Mapping[str, str] | None = None
def __init__(
self,
*,
hashes: Mapping[str, str] | None = None,
) -> None:
object.__setattr__(self, "hashes", hashes)
@classmethod
def _from_dict(cls, d: Mapping[str, Any]) -> Self:
hashes = _get(d, Mapping, "hashes") # type: ignore[type-abstract]
if hashes is not None and not all(isinstance(h, str) for h in hashes.values()):
raise DirectUrlValidationError(
"Hash values must be strings", context="hashes"
)
legacy_hash = _get(d, str, "hash")
if legacy_hash is not None:
if "=" not in legacy_hash:
raise DirectUrlValidationError(
"Invalid hash format (expected '<algorithm>=<hash>')",
context="hash",
)
hash_algorithm, hash_value = legacy_hash.split("=", 1)
if hashes is None:
# if `hashes` are not present, we can derive it from the legacy `hash`
hashes = {hash_algorithm: hash_value}
else:
# if `hashes` are present, the legacy `hash` must match one of them
if hash_algorithm not in hashes:
raise DirectUrlValidationError(
f"Algorithm {hash_algorithm!r} used in hash field "
f"is not present in hashes field",
context="hashes",
)
if hashes[hash_algorithm] != hash_value:
raise DirectUrlValidationError(
f"Algorithm {hash_algorithm!r} used in hash field "
f"has different value in hashes field",
context="hash",
)
return cls(hashes=hashes)
@dataclasses.dataclass(frozen=True, init=False)
class DirInfo:
editable: bool | None = None
def __init__(
self,
*,
editable: bool | None = None,
) -> None:
object.__setattr__(self, "editable", editable)
@classmethod
def _from_dict(cls, d: Mapping[str, Any]) -> Self:
return cls(
editable=_get(d, bool, "editable"),
)
@dataclasses.dataclass(frozen=True, init=False)
class DirectUrl:
"""A class representing a direct URL."""
url: str
archive_info: ArchiveInfo | None = None
vcs_info: VcsInfo | None = None
dir_info: DirInfo | None = None
subdirectory: str | None = None # XXX Path or str?
def __init__(
self,
*,
url: str,
archive_info: ArchiveInfo | None = None,
vcs_info: VcsInfo | None = None,
dir_info: DirInfo | None = None,
subdirectory: str | None = None,
) -> None:
object.__setattr__(self, "url", url)
object.__setattr__(self, "archive_info", archive_info)
object.__setattr__(self, "vcs_info", vcs_info)
object.__setattr__(self, "dir_info", dir_info)
object.__setattr__(self, "subdirectory", subdirectory)
@classmethod
def _from_dict(cls, d: Mapping[str, Any]) -> Self:
direct_url = cls(
url=_get_required(d, str, "url"),
archive_info=_get_object(d, ArchiveInfo, "archive_info"),
vcs_info=_get_object(d, VcsInfo, "vcs_info"),
dir_info=_get_object(d, DirInfo, "dir_info"),
subdirectory=_get(d, str, "subdirectory"),
)
if (
bool(direct_url.vcs_info)
+ bool(direct_url.archive_info)
+ bool(direct_url.dir_info)
) != 1:
raise DirectUrlValidationError(
"Exactly one of vcs_info, archive_info, dir_info must be present"
)
if direct_url.dir_info is not None and not direct_url.url.startswith("file://"):
raise DirectUrlValidationError(
"URL scheme must be file:// when dir_info is present",
context="url",
)
# XXX subdirectory must be relative, can we, should we validate that here?
return direct_url
@classmethod
def from_dict(cls, d: Mapping[str, Any], /) -> Self:
"""Create and validate a DirectUrl instance from a JSON dictionary."""
return cls._from_dict(d)
def to_dict(
self,
*,
generate_legacy_hash: bool = False,
strip_user_password: bool = True,
safe_user_passwords: Collection[str] = ("git",),
) -> Mapping[str, Any]:
"""Convert the DirectUrl instance to a JSON dictionary.
:param generate_legacy_hash: If True, include a legacy `hash` field in
`archive_info` for backward compatibility with tools that don't
support the `hashes` field.
:param strip_user_password: If True, strip user:password from the URL
unless it is formed with environment variables as specified in PEP
610, or it is a safe user:password such as `git`.
:param safe_user_passwords: A collection of user:password strings that
should not be stripped from the URL even if `strip_user_password` is
True.
"""
res = dataclasses.asdict(self, dict_factory=_json_dict_factory)
if generate_legacy_hash and self.archive_info and self.archive_info.hashes:
hash_algorithm, hash_value = next(iter(self.archive_info.hashes.items()))
res["archive_info"]["hash"] = f"{hash_algorithm}={hash_value}"
if strip_user_password:
res["url"] = _strip_url(self.url, safe_user_passwords)
return res
def validate(self) -> None:
"""Validate the DirectUrl instance against the specification.
Raises :class:`DirectUrlValidationError` if invalid.
"""
self.from_dict(self.to_dict())
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