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"""
Part of the BlackStar filesystem (bsfs) module.
A copy of the license is provided with the project.
Author: Matthias Baumgartner, 2022
"""
# imports
import abc
import typing
# bsfs imports
from bsfs import schema
from bsfs.triple_store import TripleStoreBase
from bsfs.utils import URI
# exports
__all__: typing.Sequence[str] = (
'AccessControlBase',
)
## code ##
class AccessControlBase(abc.ABC):
"""Defines the interface for access control policies.
An access control policy governs which actions a user may take to query
or to manipulate a graph.
"""
# The triple store backend.
_backend: TripleStoreBase
# The current user.
_user: URI
def __init__(
self,
backend: TripleStoreBase,
user: URI,
):
self._backend = backend
self._user = URI(user)
@abc.abstractmethod
def is_protected_predicate(self, pred: schema.Predicate) -> bool:
"""Return True if a predicate cannot be modified manually."""
@abc.abstractmethod
def create(self, node_type: schema.Node, guids: typing.Iterable[URI]):
"""Perform post-creation operations on nodes, e.g. ownership information."""
@abc.abstractmethod
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."""
@abc.abstractmethod
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."""
@abc.abstractmethod
def write_literal(self, node_type: schema.Node, guids: typing.Iterable[URI]) -> typing.Iterable[URI]:
"""Return nodes to which literals can be attached."""
@abc.abstractmethod
def createable(self, node_type: schema.Node, guids: typing.Iterable[URI]) -> typing.Iterable[URI]:
"""Return nodes that are allowed to be created."""
## EOF ##
|
