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import functools
from typing import TYPE_CHECKING, Optional, TypeVar, cast
from django.core.exceptions import FieldDoesNotExist
from django.db.models import Exists, F, Model, Q, QuerySet
from django.db.models.functions import Cast
from strawberry.utils.inspect import in_async_context
from .typing import TypeOrIterable, UserType
if TYPE_CHECKING:
from django.contrib.auth.models import AbstractUser
from django.contrib.contenttypes.models import ContentType
from guardian.managers import (
GroupObjectPermissionManager,
UserObjectPermissionManager,
)
_Q = TypeVar("_Q", bound=QuerySet)
def _filter(
qs: _Q,
perms: list[str],
*,
lookup: str = "",
model: type[Model],
any_perm: bool = True,
ctype: Optional["ContentType"] = None,
) -> _Q:
lookup = lookup and f"{lookup}__"
ctype_attr = f"{lookup}content_type"
if ctype is not None:
q = Q(**{ctype_attr: ctype})
else:
meta = model._meta
q = Q(
**{
f"{ctype_attr}__app_label": meta.app_label,
f"{ctype_attr}__model": meta.model_name,
},
)
if len(perms) == 1:
q &= Q(**{f"{lookup}codename": perms[0]})
elif any_perm:
q &= Q(**{f"{lookup}codename__in": perms})
else:
q = functools.reduce(
lambda acu, p: acu & Q(**{f"{lookup}codename": p}),
perms,
q,
)
return qs.filter(q)
def filter_for_user_q(
qs: QuerySet,
user: UserType,
perms: TypeOrIterable[str],
*,
any_perm: bool = True,
with_groups: bool = True,
with_superuser: bool = False,
):
if with_superuser and user.is_active and getattr(user, "is_superuser", False):
return qs
if user.is_anonymous:
return qs.none()
groups_field = None
try:
groups_field = cast("AbstractUser", user)._meta.get_field("groups")
except FieldDoesNotExist:
with_groups = False
if isinstance(perms, str):
perms = [perms]
model = cast("type[Model]", qs.model)
if model._meta.concrete_model:
model = model._meta.concrete_model
try:
from django.contrib.contenttypes.models import ContentType
except (ImportError, RuntimeError): # pragma: no cover
ctype = None
else:
try:
# We don't want to query the database here because this might not be async
# safe. Try to retrieve the ContentType from cache. If it is not there, we
# will query it through the queryset
meta = model._meta
ctype = cast(
"ContentType",
ContentType.objects._get_from_cache(meta), # type: ignore
)
except KeyError: # pragma:nocover
# If we are not running async, retrieve it
ctype = (
ContentType.objects.get_for_model(model, for_concrete_model=False)
if not in_async_context()
else None
)
app_labels = set()
perms_list = []
for p in perms:
parts = p.split(".")
if len(parts) > 1:
app_labels.add(parts[0])
perms_list.append(parts[-1])
if len(app_labels) == 1 and ctype is not None:
app_label = app_labels.pop()
if app_label != ctype.app_label: # pragma:nocover
raise ValueError(
f"Given perms must have same app label ({app_label!r} !="
f" {ctype.app_label!r})",
)
elif len(app_labels) > 1: # pragma:nocover
raise ValueError(f"Cannot mix app_labels ({app_labels!r})")
# Small optimization if the user's permissions are cached
perm_cache: Optional[set[str]] = getattr(user, "_perm_cache", None)
if perm_cache is not None:
f = any if any_perm else all
if f(p in perm_cache for p in perms_list):
return qs
q = Q()
if hasattr(user, "user_permissions"):
q |= Q(
Exists(
_filter(
cast("AbstractUser", user).user_permissions,
perms_list,
model=model,
ctype=ctype,
),
),
)
if with_groups:
q |= Q(
Exists(
_filter(
cast("AbstractUser", user).groups,
perms_list,
lookup="permissions",
model=model,
ctype=ctype,
),
),
)
try:
from strawberry_django.integrations.guardian import (
get_object_permission_models,
)
except (ImportError, RuntimeError): # pragma: no cover
pass
else:
perm_models = get_object_permission_models(qs.model)
user_model = perm_models.user
user_qs = _filter(
user_model.objects.filter(user=user),
perms_list,
lookup="permission",
model=model,
ctype=ctype,
)
if cast("UserObjectPermissionManager", user_model.objects).is_generic():
user_qs = user_qs.filter(content_type=F("permission__content_type"))
else:
user_qs = user_qs.annotate(object_pk=F("content_object"))
obj_qs = user_qs.values_list(
Cast("object_pk", cast("str", model._meta.pk)),
flat=True,
).distinct()
if with_groups:
assert groups_field is not None
group_model = perm_models.group
user_key = f"group__{groups_field.related_query_name()}" # type: ignore
group_qs = _filter(
group_model.objects.filter(**{user_key: user}),
perms_list,
lookup="permission",
model=model,
ctype=ctype,
)
if cast("GroupObjectPermissionManager", group_model.objects).is_generic():
group_qs = group_qs.filter(content_type=F("permission__content_type"))
else:
group_qs = group_qs.annotate(object_pk=F("content_object"))
obj_qs = obj_qs.union(
group_qs.values_list(
Cast("object_pk", cast("str", model._meta.pk)),
flat=True,
).distinct(),
)
q |= Q(pk__in=obj_qs)
return q
def filter_for_user(
qs: QuerySet,
user: UserType,
perms: TypeOrIterable[str],
*,
any_perm: bool = True,
with_groups: bool = True,
with_superuser: bool = False,
):
return qs & qs.filter(
filter_for_user_q(
qs,
user,
perms,
any_perm=any_perm,
with_groups=with_groups,
with_superuser=with_superuser,
),
)
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