1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
|
"""Handle management of roles"""
from uuid import UUID, uuid4
from functools import reduce
from dataclasses import dataclass
from typing import Sequence, Iterable
from pymonad.either import Left, Right, Either
from gn_auth.auth.errors import NotFoundError, AuthorisationError
from ...db import sqlite3 as db
from ...authentication.users import User
from ..checks import authorised_p
from ..privileges import Privilege
@dataclass(frozen=True)
class Role:
"""Class representing a role: creates immutable objects."""
role_id: UUID
role_name: str
user_editable: bool
privileges: tuple[Privilege, ...]
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__(resources, row) -> dict:
resource_id = UUID(row["resource_id"])
role_id = UUID(row["role_id"])
roles = resources.get(resource_id, {}).get("roles", {})
role = roles.get(role_id, Role(
role_id,
row["role_name"],
bool(int(row["user_editable"])),
tuple()))
return {
**resources,
resource_id: {
"resource_id": resource_id,
"user_id": UUID(row["user_id"]),
"roles": {
**roles,
role_id: Role(
role.role_id,
role.role_name,
role.user_editable,
role.privileges + (Privilege(
row["privilege_id"],
row["privilege_description"]),)
)
}
}
}
def user_roles(conn: db.DbConnection, user: User) -> Sequence[dict]:
"""Retrieve all roles (organised by resource) assigned to the user."""
with db.cursor(conn) as cursor:
cursor.execute("SELECT * FROM user_roles")
cursor.execute(
"SELECT ur.resource_id, ur.user_id, 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({# type: ignore[var-annotated]
**row, "roles": tuple(row["roles"].values())
} for row in 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 res.resource_id, ur.user_id, r.*, p.* "
"FROM resources AS res INNER JOIN user_roles AS ur "
"ON res.resource_id=ur.resource_id 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:
res_role_obj = tuple(# type: ignore[var-annotated]
reduce(__organise_privileges__, results, {}).values())[0]
resource_id = res_role_obj["resource_id"]
role = tuple(res_role_obj["roles"].values())[0]
return Right((role, resource_id))
return Left(NotFoundError(
f"Could not find role with id '{role_id}'",))
def __assign_group_creator_role__(cursor: db.DbCursor, user: User):
cursor.execute(
'SELECT role_id FROM roles WHERE role_name IN '
'("group-creator")')
role_id = cursor.fetchone()["role_id"]
cursor.execute(
"SELECT resource_id FROM resources AS r "
"INNER JOIN resource_categories AS rc "
"ON r.resource_category_id=rc.resource_category_id "
"WHERE rc.resource_category_key='system'")
resource_id = cursor.fetchone()["resource_id"]
cursor.execute(
("INSERT INTO user_roles VALUES (:user_id, :role_id, :resource_id)"),
{"user_id": str(user.user_id), "role_id": role_id,
"resource_id": resource_id})
def __assign_public_view_role__(cursor: db.DbCursor, user: User):
cursor.execute("SELECT resource_id FROM resources WHERE public=1")
public_resources = tuple(row["resource_id"] for row in cursor.fetchall())
cursor.execute("SELECT role_id FROM roles WHERE role_name='public-view'")
role_id = cursor.fetchone()["role_id"]
cursor.executemany(
"INSERT INTO user_roles(user_id, role_id, resource_id) "
"VALUES(:user_id, :role_id, :resource_id)",
tuple({
"user_id": str(user.user_id),
"role_id": role_id,
"resource_id": resource_id
} for resource_id in public_resources))
def assign_default_roles(cursor: db.DbCursor, user: User):
"""Assign `user` some default roles."""
__assign_group_creator_role__(cursor, user)
__assign_public_view_role__(cursor, user)
def revoke_user_role_by_name(cursor: db.DbCursor, user: User, role_name: str):
"""Revoke a role from `user` by the role's name"""
# TODO: Pass in the resource_id - this works somewhat correctly, but it's
# only because it is used in for revoking the "group-creator" role so
# far
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, resource_id: UUID, 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, :resource_id) "
"ON CONFLICT DO NOTHING"),
{
"user_id": str(user.user_id),
"role_id": role["role_id"],
"resource_id": str(resource_id)
})
|
