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"""Handle management of roles"""
from uuid import UUID, uuid4
from functools import reduce
from typing import Iterable, NamedTuple
from gn3.auth import db
from gn3.auth.authentication.users import User
from gn3.auth.authentication.checks import authenticated_p
from .checks import authorised_p
from .privileges import Privilege
class Role(NamedTuple):
"""Class representing a role: creates immutable objects."""
role_id: UUID
role_name: str
privileges: Iterable[Privilege]
@authenticated_p
@authorised_p(("create-role",), error_message="Could not create role")
def create_role(
cursor: db.DbCursor, role_name: str,
privileges: Iterable[Privilege]) -> Role:
"""
Create a new generic role.
PARAMS:
* cursor: A database cursor object - This function could be used as part of
a transaction, hence the use of a cursor rather than a connection
object.
* role_name: The name of the role
* privileges: A 'list' of privileges to assign the new role
RETURNS: An immutable `gn3.auth.authorisation.roles.Role` object
"""
role = Role(uuid4(), role_name, privileges)
cursor.execute(
"INSERT INTO roles(role_id, role_name) VALUES (?, ?)",
(str(role.role_id), role.role_name))
cursor.executemany(
"INSERT INTO role_privileges(role_id, privilege_id) VALUES (?, ?)",
tuple((str(role.role_id), str(priv.privilege_id))
for priv in privileges))
return role
def __organise_privileges__(roles_dict, privilege_row):
"""Organise the privileges into their roles."""
role_id_str = privilege_row["role_id"]
if role_id_str in roles_dict:
return {
**roles_dict,
role_id_str: Role(
UUID(role_id_str),
privilege_row["role_name"],
roles_dict[role_id_str].privileges + (
Privilege(UUID(privilege_row["privilege_id"]),
privilege_row["privilege_name"]),))
}
return {
**roles_dict,
role_id_str: Role(
UUID(role_id_str),
privilege_row["role_name"],
(Privilege(UUID(privilege_row["privilege_id"]),
privilege_row["privilege_name"]),))
}
def user_roles(conn: db.DbConnection, user: User):
"""Retrieve non-resource roles assigned to the user."""
with db.cursor(conn) as cursor:
cursor.execute(
"SELECT r.*, p.* FROM user_roles AS ur INNER JOIN roles AS r "
"ON ur.role_id=r.role_id INNER JOIN role_privileges AS rp "
"ON r.role_id=rp.role_id INNER JOIN privileges AS p "
"ON rp.privilege_id=p.privilege_id WHERE ur.user_id=?",
(str(user.user_id),))
results = cursor.fetchall()
if results:
return tuple(
reduce(__organise_privileges__, results, {}).values())
return tuple()
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