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Diffstat (limited to 'gn_auth/auth/authorisation/roles/models.py')
| -rw-r--r-- | gn_auth/auth/authorisation/roles/models.py | 161 |
1 files changed, 161 insertions, 0 deletions
diff --git a/gn_auth/auth/authorisation/roles/models.py b/gn_auth/auth/authorisation/roles/models.py new file mode 100644 index 0000000..97e11af --- /dev/null +++ b/gn_auth/auth/authorisation/roles/models.py @@ -0,0 +1,161 @@ +"""Handle management of roles""" +from uuid import UUID, uuid4 +from functools import reduce +from typing import Any, Sequence, Iterable, NamedTuple + +from pymonad.either import Left, Right, Either + +from gn3.auth import db +from gn3.auth.dictify import dictify +from gn3.auth.authentication.users import User +from gn3.auth.authorisation.errors import AuthorisationError + +from ..checks import authorised_p +from ..privileges import Privilege +from ..errors import NotFoundError + +class Role(NamedTuple): + """Class representing a role: creates immutable objects.""" + role_id: UUID + role_name: str + user_editable: bool + privileges: tuple[Privilege, ...] + + def dictify(self) -> dict[str, Any]: + """Return a dict representation of `Role` objects.""" + return { + "role_id": self.role_id, "role_name": self.role_name, + "user_editable": self.user_editable, + "privileges": tuple(dictify(priv) for priv in self.privileges) + } + +def check_user_editable(role: Role): + """Raise an exception if `role` is not user editable.""" + if not role.user_editable: + raise AuthorisationError( + f"The role `{role.role_name}` is not user editable.") + +@authorised_p( + privileges = ("group:role:create-role",), + error_description="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, True, tuple(privileges)) + + cursor.execute( + "INSERT INTO roles(role_id, role_name, user_editable) VALUES (?, ?, ?)", + (str(role.role_id), role.role_name, (1 if role.user_editable else 0))) + 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"], + bool(int(privilege_row["user_editable"])), + roles_dict[role_id_str].privileges + ( + Privilege(privilege_row["privilege_id"], + privilege_row["privilege_description"]),)) + } + + return { + **roles_dict, + role_id_str: Role( + UUID(role_id_str), + privilege_row["role_name"], + bool(int(privilege_row["user_editable"])), + (Privilege(privilege_row["privilege_id"], + privilege_row["privilege_description"]),)) + } + +def user_roles(conn: db.DbConnection, user: User) -> Sequence[Role]: + """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),)) + + return tuple( + reduce(__organise_privileges__, cursor.fetchall(), {}).values()) + return tuple() + +def user_role(conn: db.DbConnection, user: User, role_id: UUID) -> Either: + """Retrieve a specific non-resource role 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=? AND ur.role_id=?", + (str(user.user_id), str(role_id))) + + results = cursor.fetchall() + if results: + return Right(tuple( + reduce(__organise_privileges__, results, {}).values())[0]) + return Left(NotFoundError( + f"Could not find role with id '{role_id}'",)) + +def assign_default_roles(cursor: db.DbCursor, user: User): + """Assign `user` some default roles.""" + cursor.execute( + 'SELECT role_id FROM roles WHERE role_name IN ' + '("group-creator")') + role_ids = cursor.fetchall() + str_user_id = str(user.user_id) + params = tuple( + {"user_id": str_user_id, "role_id": row["role_id"]} for row in role_ids) + cursor.executemany( + ("INSERT INTO user_roles VALUES (:user_id, :role_id)"), + params) + +def revoke_user_role_by_name(cursor: db.DbCursor, user: User, role_name: str): + """Revoke a role from `user` by the role's name""" + cursor.execute( + "SELECT role_id FROM roles WHERE role_name=:role_name", + {"role_name": role_name}) + role = cursor.fetchone() + if role: + cursor.execute( + ("DELETE FROM user_roles " + "WHERE user_id=:user_id AND role_id=:role_id"), + {"user_id": str(user.user_id), "role_id": role["role_id"]}) + +def assign_user_role_by_name(cursor: db.DbCursor, user: User, role_name: str): + """Revoke a role from `user` by the role's name""" + cursor.execute( + "SELECT role_id FROM roles WHERE role_name=:role_name", + {"role_name": role_name}) + role = cursor.fetchone() + + if role: + cursor.execute( + ("INSERT INTO user_roles VALUES(:user_id, :role_id) " + "ON CONFLICT DO NOTHING"), + {"user_id": str(user.user_id), "role_id": role["role_id"]}) |