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88 lines
2.7 KiB
88 lines
2.7 KiB
"""Role service for Corvus."""
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from collections import defaultdict
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from enum import Enum
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from typing import Optional, List, Set, Dict
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class Role(Enum):
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"""User role definitions."""
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ADMIN = 'ADMIN'
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AUDITOR = 'AUDITOR'
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MODERATOR = 'MODERATOR'
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USER = 'USER'
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ANONYMOUS = 'ANONYMOUS'
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NONE = 'NONE'
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class RoleTree(defaultdict):
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"""Simple tree structure to handle hierarchy."""
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def __call__(self, data: Role) -> 'RoleTree':
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"""Handle direct calls to the tree."""
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return RoleTree(self, data)
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# def __hash__(self):
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def __init__(
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self,
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parent: Optional['RoleTree'],
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data: Role,
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**kwargs: dict) -> None:
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"""Configure a RoleTree."""
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super().__init__(**kwargs)
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self.parent: Optional[RoleTree] = parent
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self.data: Role = data
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self.default_factory = self # type: ignore
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self.roles: Dict[Role, List[RoleTree]] = {data: [self]}
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def populate(
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self, children: Dict[Role, Optional[dict]]) -> List['RoleTree']:
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"""Populate a RoleTree from a dictionary of a Role hierarchy."""
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role_list: List[RoleTree] = []
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for child_role in children.keys():
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element = children[child_role]
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new_node = self(child_role)
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if isinstance(element, dict) and element:
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role_list += new_node.populate(element)
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self[child_role] = new_node
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role_list.append(new_node)
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for role_tree in role_list:
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if role_tree.data not in self.roles.keys():
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self.roles[role_tree.data] = []
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self.roles[role_tree.data].append(role_tree)
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return role_list
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def find_role(self, request_role: Role) -> List['RoleTree']:
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"""Identify all instances of a role."""
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try:
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return [role_tree for role_tree in self.roles[request_role]]
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except KeyError:
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return []
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def get_parent_roles(self) -> List[Role]:
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"""Return all the roles from self to the highest parent."""
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if self.parent is not None:
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return [self.data] + self.parent.get_parent_roles()
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return [self.data]
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def find_roles_in_hierarchy(self, request_role: Role) -> Set[Role]:
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"""Find a set of all roles that fall within the hierarchy."""
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roles: List[Role] = []
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role_trees = self.find_role(request_role)
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for role_tree in role_trees:
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roles.extend(role_tree.get_parent_roles())
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return set(role for role in roles)
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ROLES = RoleTree(None, Role.ADMIN)
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ROLES.populate({
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Role.MODERATOR: {
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Role.USER: {
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Role.ANONYMOUS: None
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}
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},
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Role.AUDITOR: {
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Role.USER: None
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}
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})
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