auth: Check for authentication and fix errors

* gn3/auth/authorisation/groups.py: base `MembershipError` on new
  `AuthorisationError` base exception. Use new authentication checking
  decorator.
* gn3/auth/authorisation/privileges.py: Change argument to User object rather
  than UUID object
* gn3/auth/authorisation/roles.py: Use new authentication checking decorator.
* tests/unit/auth/test_groups.py: use `conftest.TEST_USER`
* tests/unit/auth/test_privileges.py: use `conftest.TEST_USER`
* tests/unit/auth/test_roles.py: use `conftest.TEST_USER`

3 files changed, 9 insertions, 3 deletions

diff --git a/gn3/auth/authorisation/groups.py b/gn3/auth/authorisation/groups.py
index ac80089..6496e87 100644
--- a/gn3/auth/authorisation/groups.py
+++ b/gn3/auth/authorisation/groups.py
@@ -12,6 +12,7 @@ from gn3.auth.authentication.checks import authenticated_p
 from .checks import authorised_p
 from .privileges import Privilege
 from .roles import Role, create_role
+from .exceptions import AuthorisationError
 
 class Group(NamedTuple):
     """Class representing a group."""
@@ -23,7 +24,7 @@ class GroupRole(NamedTuple):
     group_role_id: UUID
     role: Role
 
-class MembershipError(Exception):
+class MembershipError(AuthorisationError):
     """Raised when there is an error with a user's membership to a group."""
 
     def __init__(self, user: User, groups: Sequence[Group]):
@@ -46,6 +47,7 @@ def user_membership(conn: db.DbConnection, user: User) -> Sequence[Group]:
 
     return groups
 
+@authenticated_p
 @authorised_p(("create-group",), error_message="Failed to create group.")
 def create_group(conn: db.DbConnection, group_name: str,
                  group_leader: User) -> Group:
@@ -65,6 +67,7 @@ def create_group(conn: db.DbConnection, group_name: str,
 
     return group
 
+@authenticated_p
 @authorised_p(("create-role",), error_message="Could not create the group role")
 def create_group_role(
         conn: db.DbConnection, group: Group, role_name: str,
diff --git a/gn3/auth/authorisation/privileges.py b/gn3/auth/authorisation/privileges.py
index 09439ad..9e66bda 100644
--- a/gn3/auth/authorisation/privileges.py
+++ b/gn3/auth/authorisation/privileges.py
@@ -3,13 +3,14 @@ from uuid import UUID
 from typing import Iterable, NamedTuple
 
 from gn3.auth import db
+from gn3.auth.authentication.users import User
 
 class Privilege(NamedTuple):
     """Class representing a privilege: creates immutable objects."""
     privilege_id: UUID
     privilege_name: str
 
-def user_privileges(conn: db.DbConnection, user_id: UUID) -> Iterable[Privilege]:
+def user_privileges(conn: db.DbConnection, user: User) -> Iterable[Privilege]:
     """Fetch the user's privileges from the database."""
     with db.cursor(conn) as cursor:
         cursor.execute(
@@ -18,7 +19,7 @@ def user_privileges(conn: db.DbConnection, user_id: UUID) -> Iterable[Privilege]
              "INNER JOIN role_privileges AS rp ON ur.role_id=rp.role_id "
              "INNER JOIN privileges AS p ON rp.privilege_id=p.privilege_id "
              "WHERE ur.user_id=?"),
-            (str(user_id),))
+            (str(user.user_id),))
         results = cursor.fetchall()
 
     return (Privilege(UUID(row[0]), row[1]) for row in results)
diff --git a/gn3/auth/authorisation/roles.py b/gn3/auth/authorisation/roles.py
index 8435c40..397ad80 100644
--- a/gn3/auth/authorisation/roles.py
+++ b/gn3/auth/authorisation/roles.py
@@ -3,6 +3,7 @@ from uuid import UUID, uuid4
 from typing import Iterable, NamedTuple
 
 from gn3.auth import db
+from gn3.auth.authentication.checks import authenticated_p
 
 from .checks import authorised_p
 from .privileges import Privilege
@@ -13,6 +14,7 @@ class Role(NamedTuple):
     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,