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# imports
import typing
# bsfs imports
from bsfs import schema
from bsfs.namespace import ns
from bsfs.query import ast
from bsfs.utils import URI
# inner-module imports
from . import base
# exports
__all__: typing.Sequence[str] = (
'NullAC',
)
## code ##
class NullAC(base.AccessControlBase):
"""The NULL access control implements a dummy policy that allows any action to any user."""
def is_protected_predicate(self, pred: schema.Predicate) -> bool:
"""Return True if a predicate cannot be modified manually."""
return pred.uri == ns.bsn.t_created
def create(self, node_type: schema.Node, guids: typing.Iterable[URI]):
"""Perform post-creation operations on nodes, e.g. ownership information."""
def link_from_node(self, node_type: schema.Node, guids: typing.Iterable[URI]) -> typing.Iterable[URI]:
"""Return nodes for which outbound links can be written."""
return guids
def link_to_node(self, node_type: schema.Node, guids: typing.Iterable[URI]) -> typing.Iterable[URI]:
"""Return nodes for which inbound links can be written."""
return guids
def write_literal(self, node_type: schema.Node, guids: typing.Iterable[URI]) -> typing.Iterable[URI]:
"""Return nodes to which literals can be attached."""
return guids
def createable(self, node_type: schema.Node, guids: typing.Iterable[URI]) -> typing.Iterable[URI]:
"""Return nodes that are allowed to be created."""
return guids
def filter_read(
self,
node_type: schema.Node,
query: typing.Optional[ast.filter.FilterExpression]
) -> typing.Optional[ast.filter.FilterExpression]:
"""Re-write a filter *query* to get (i.e., read) *node_type* nodes."""
return query
def fetch_read(self, node_type: schema.Node, query: ast.fetch.FetchExpression) -> ast.fetch.FetchExpression:
"""Re-write a fetch *query* to get (i.e, read) values for *node_type* nodes."""
return query
## EOF ##
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