def _aux_filter(cls, model: Type['CremeEntity'],
sc_sequence: Sequence['SetCredentials'], user,
queryset: QuerySet, perm: int) -> QuerySet:
allowed_ctype_ids = {None, ContentType.objects.get_for_model(model).id}
ESET_ALL = cls.ESET_ALL
ESET_OWN = cls.ESET_OWN
forbidden, allowed = split_filter(
lambda sc: sc.forbidden,
sorted(
(sc for sc in sc_sequence
if sc.ctype_id in allowed_ctype_ids and sc.value & perm),
# NB: we sort to get ESET_ALL creds before ESET_OWN ones, then ESET_FILTER ones.
key=lambda sc: sc.set_type,
))
if not allowed:
return queryset.none()
if any(f.set_type == ESET_ALL for f in forbidden):
return queryset.none()
def user_filtering_kwargs(): # TODO: cache/lazy
teams = user.teams
return {'user__in': [user, *teams]} if teams else {'user': user}
filtered_qs = queryset
q = Q()
for cred in allowed:
set_type = cred.set_type
if set_type == ESET_ALL:
break
if set_type == ESET_OWN:
q |= Q(**user_filtering_kwargs())
else: # SetCredentials.ESET_FILTER
# TODO: distinct ? (see EntityFilter.filter())
q |= cred.efilter.get_q(user=user)
else:
filtered_qs = filtered_qs.filter(q)
for cred in forbidden:
if cred.set_type == ESET_OWN:
filtered_qs = filtered_qs.exclude(**user_filtering_kwargs())
else: # SetCredentials.ESET_FILTER
filtered_qs = filtered_qs.exclude(
cred.efilter.get_q(user=user))
return filtered_qs
def filter(self, _source: QuerySet, ids=None, **kwargs) -> QuerySet:
if not self.Meta.is_public and not self.ctx.user.is_authenticated:
_source = _source.none()
if ids is not None:
_source = _source.filter(id__in=ids)
return _source
def retry_qs(qs: QuerySet, **kwargs):
for delay in (0.5, 1, 2, 4, None):
result = qs.filter(**kwargs)
if result.exists():
return result
else:
if delay:
time.sleep(delay)
else:
return qs.none()
def filter_queryset(self, request: Request, queryset: QuerySet, view: View) -> QuerySet:
if request.user.role == RoleEnum.USER:
return queryset.filter(id=request.user.id)
elif request.user.role == RoleEnum.MANAGER:
return queryset.filter(Q(role=int(RoleEnum.USER)) | Q(role=int(RoleEnum.MANAGER)))
elif request.user.role == RoleEnum.ADMIN:
return queryset
else:
self._logger.error(f'Unknown role {request.user.role}')
return queryset.none()
def list_resolver(django_object_type, resolver, root, info, **args):
queryset = maybe_queryset(resolver(root, info, **args))
if queryset is None:
queryset = QuerySet.none() # FIXME: This will throw error
if isinstance(queryset, QuerySet):
if hasattr(django_object_type, 'get_queryset'):
# Pass queryset to the DjangoObjectType get_queryset method
queryset = maybe_queryset(
django_object_type.get_queryset(queryset, info))
return queryset
def filter(self, user, queryset: QuerySet, perm: int) -> QuerySet:
"""Filter a QuerySet of CremeEntities by the credentials related to this role.
Beware, the model class must be a child class of CremeEntity,
but cannot be CremeEntity itself.
@param user: A <django.contrib.auth.get_user_model()> instance (eg: CremeUser) ;
should be related to the UserRole instance.
@param queryset: A Queryset on a child class of CremeEntity.
@param perm: A value in (EntityCredentials.VIEW, EntityCredentials.CHANGE etc...).
@return: A new (filtered) queryset on the same model.
"""
model = queryset.model
assert issubclass(model, CremeEntity)
assert model is not CremeEntity
if self.is_app_allowed_or_administrable(model._meta.app_label):
queryset = SetCredentials.filter(self._get_setcredentials(), user,
queryset, perm)
else:
queryset = queryset.none()
return queryset
def search_escaped_and_unescaped(super_obj: admin.ModelAdmin, request,
input_queryset: QuerySet, search_term: str):
"""
Can be called from the ``get_search_results()`` method of ``ModelAdmin`` classes, to search using both escaped and unescaped characters.
For example, passing in "grøt" as ``search_term``, will search for both "grøt" and "grøt".
"""
# `use_distinct` starts as `False` in Django's `get_search_results()`
combined_searched_querysets, use_distinct_result = input_queryset.none(
), False
# Try both with and without escaping:
for search_term_repr in (search_term,
escape_to_named_characters(search_term)):
searched_queryset, use_distinct = super_obj.get_search_results(
request, input_queryset, search_term_repr)
combined_searched_querysets = combined_searched_querysets.union(
searched_queryset.order_by()) # clear ordering
use_distinct_result |= use_distinct
result_queryset = input_queryset.filter(
pk__in={cb.pk
for cb in combined_searched_querysets})
return result_queryset, use_distinct_result
def filter_node(self, queryset: QuerySet):
is_query_all = self.get_query_param('all', True)
node_id = self.get_query_param('node_id')
node_name = self.get_query_param('node')
if node_id:
_nodes = Node.objects.filter(pk=node_id)
elif node_name:
_nodes = Node.objects.filter(value=node_name)
else:
return queryset
if not _nodes:
return queryset.none()
node = _nodes.first()
if not is_query_all:
queryset = queryset.filter(nodes=node)
return queryset
nodeids = node.get_ancestors(with_self=True).values_list('id', flat=True)
nodeids = list(nodeids)
queryset = queryset.filter(nodes__in=nodeids)
return queryset
def filter_queryset(
self, queryset: QuerySet, feature_type: FeatureType
) -> QuerySet:
"""Apply the filters and lookups to the queryset.
:param queryset: The queryset to filter.
:param feature_type: The feature type that the queryset originated from.
"""
if self.is_empty:
return queryset.none()
if self.extra_lookups:
# Each time an expression node calls add_extra_lookup(),
# the parent should have used apply_extra_lookups()
raise RuntimeError("apply_extra_lookups() was not called")
# All are applied at once.
if self.annotations:
queryset = queryset.annotate(**self.annotations)
lookups = self.lookups
try:
lookups += self.typed_lookups[feature_type.name]
except KeyError:
pass
if lookups:
queryset = queryset.filter(*lookups)
if self.ordering:
queryset = queryset.order_by(*self.ordering)
if self.distinct:
queryset = queryset.distinct()
return queryset
def filter_entities(cls,
sc_sequence: Sequence['SetCredentials'],
user,
queryset: QuerySet,
perm: int,
models: Iterable[Type['CremeEntity']],
as_model=None) -> QuerySet:
"""Filter a queryset of entities with the given credentials.
Beware, model class must be CremeEntity ; it cannot be a child class
of CremeEntity.
@param sc_sequence: A sequence of SetCredentials instances.
@param user: A django.contrib.auth.get_user_model() instance (eg: CremeUser).e.
@param queryset: Queryset with model=CremeEntity.
@param perm: A value in (EntityCredentials.VIEW, EntityCredentials.CHANGE etc...).
@param models: An iterable of CremeEntity-child-classes, corresponding
to allowed models.
@param as_model: A model inheriting CremeEntity, or None. If a model is
given, all the entities in the queryset are filtered with the
credentials for this model.
BEWARE: you should probably use this feature only if the queryset
if already filtered by its field 'entity_type' (to keep only
entities of the right model, & so do not make mistakes with credentials).
@return: A new queryset on CremeEntity.
@raise: EntityCredentials.FilteringError if an EntityFilter which cannot
be used on CremeEntity is found in <sc_sequence>.
"""
assert queryset.model is CremeEntity
get_for_model = ContentType.objects.get_for_model
def _check_efilters(sc_seq):
if any(sc.efilter_id and not sc.efilter.applicable_on_entity_base
for sc in sc_seq):
raise EntityCredentials.FilteringError(
"An EntityFilter (not targeting CremeEntity) is used by a "
"{cls} instance so it's not possible to use "
"{cls}.filter_entities().".format(cls=cls.__name__))
if as_model is not None:
assert issubclass(as_model, CremeEntity)
narrowed_ct_ids = {None, get_for_model(as_model).id}
narrowed_sc = [
sc for sc in sc_sequence if sc.ctype_id in narrowed_ct_ids
]
_check_efilters(narrowed_sc)
return cls._aux_filter(
model=as_model,
sc_sequence=narrowed_sc,
user=user,
queryset=queryset,
perm=perm,
)
all_ct_ids = {
None,
*(get_for_model(model).id for model in models),
}
sorted_sc = sorted(
(sc for sc in sc_sequence if sc.ctype_id in all_ct_ids),
# NB: we sort to get ESET_ALL creds before ESET_OWN/ESET_FILTER ones.
key=lambda sc: sc.set_type,
)
_check_efilters(sorted_sc)
# NB: some explanations on the algorithm :
# we try to regroup ContentTypes (corresponding to CremeEntity sub_classes)
# which have the same filtering rules ; so we can generate a Query which looks like
# entity_type__in=[...] OR (entity_type__in=[...] AND user__exact=current-user) OR
# (entity_type__in=[...] AND field1__startswith='foo')
OWN_FILTER_ID = 0 # Fake EntityFilter ID corresponding to ESET_OWN.
ESET_ALL = cls.ESET_ALL
ESET_OWN = cls.ESET_OWN
ESET_FILTER = cls.ESET_FILTER
def _extract_filter_ids(set_creds):
for sc in set_creds:
if sc.set_type == ESET_OWN:
yield OWN_FILTER_ID
break # Avoid several OWN_FILTER_ID (should not happen)
for sc in set_creds:
if sc.set_type == ESET_FILTER:
yield sc.efilter_id
# Map of EntityFilters to apply on ContentTypes groups
# key = tuple containing 2 tuples of filter IDs: forbidden rules & allowed ones.
# value = list of ContentType IDs.
# Note: special values for EntityFilter ID:
# None: means ESET_ALL (no filtering)
# OWN_FILTER_ID: means ESET_OWN (a virtual EntityFilter on "user" field).
ctypes_filtering: DefaultDict[tuple, List[int]] = defaultdict(list)
efilters_per_id = {sc.efilter_id: sc.efilter for sc in sc_sequence}
for model in models:
ct_id = get_for_model(model).id
model_ct_ids = {None, ct_id} # <None> means <CremeEntity>
forbidden, allowed = split_filter(
lambda sc: sc.forbidden,
(sc for sc in sorted_sc
if sc.ctype_id in model_ct_ids and sc.value & perm))
if allowed:
if forbidden and forbidden[0].set_type == ESET_ALL:
continue
allowed_filter_ids = [None] if allowed[0].set_type == ESET_ALL else \
[*_extract_filter_ids(allowed)]
forbidden_filter_ids = [*_extract_filter_ids(forbidden)]
ctypes_filtering[(
tuple(forbidden_filter_ids),
tuple(allowed_filter_ids),
)].append(ct_id)
if not ctypes_filtering:
queryset = queryset.none()
else:
def _user_filtering_q(): # TODO: cached/lazy ?
teams = user.teams
return Q(
**
{'user__in': [user, *teams]} if teams else {'user': user})
def _efilter_ids_to_Q(efilter_ids):
filters_q = Q()
for filter_id in efilter_ids:
# TODO: condexpr
if filter_id is not None: # None == ESET_ALL
if filter_id == OWN_FILTER_ID:
filter_q = _user_filtering_q()
else:
# TODO: distinct ??
filter_q = efilters_per_id[filter_id].get_q(
user=user)
filters_q |= filter_q
return filters_q
q = Q()
for (forbidden_filter_ids,
allowed_filter_ids), ct_ids in ctypes_filtering.items():
q |= ((Q(entity_type_id=ct_ids[0]) if len(ct_ids) == 1 else Q(
entity_type_id__in=ct_ids))
& _efilter_ids_to_Q(allowed_filter_ids)
& ~_efilter_ids_to_Q(forbidden_filter_ids))
queryset = queryset.filter(q)
return queryset
def filter_queryset(self, request: Request, queryset: QuerySet,
view: View) -> QuerySet:
if request.user.is_authenticated:
return queryset.filter(author=request.user)
else:
return queryset.none()