auth: assign default role. separate group creation from group admin

A newly registered user will have the ability to create a group.

Once a user is a member of a group, either by creating a new group, or being
added to a group, they should not be able to create any more groups, i.e. they
lose the 'create-group' (and/or equivalent) privileges.

This means that the group-administration privileges should be separated from
the group-creation privilege.

* gn3/auth/authorisation/roles.py: assign default roles to user on
  registration
* gn3/auth/authorisation/views.py: assign default roles to user on
  registration
* migrations/auth/20230111_01_Wd6IZ-remove-create-group-privilege-from-group-leader.py:
  separate group-creation role from group-administration role.
* tests/unit/auth/fixtures/user_fixtures.py: Add group-creation role to test
  user
* tests/unit/auth/test_roles.py: Add the group-creation role explicitly in the
  expected results for the test

1 files changed, 40 insertions, 0 deletions

diff --git a/migrations/auth/20230111_01_Wd6IZ-remove-create-group-privilege-from-group-leader.py b/migrations/auth/20230111_01_Wd6IZ-remove-create-group-privilege-from-group-leader.py
new file mode 100644
index 0000000..7e7fda2
--- /dev/null
+++ b/migrations/auth/20230111_01_Wd6IZ-remove-create-group-privilege-from-group-leader.py
@@ -0,0 +1,40 @@
+"""
+remove 'create-group' privilege from group-leader.
+"""
+
+from yoyo import step
+
+__depends__ = {'20221219_03_PcTrb-create-authorisation-code-table'}
+
+steps = [
+    step(
+        """
+        DELETE FROM role_privileges
+        WHERE role_id='a0e67630-d502-4b9f-b23f-6805d0f30e30'
+        AND privilege_id='4842e2aa-38b9-4349-805e-0a99a9cf8bff'
+        """,
+        """
+        INSERT INTO role_privileges VALUES
+        ('a0e67630-d502-4b9f-b23f-6805d0f30e30',
+        '4842e2aa-38b9-4349-805e-0a99a9cf8bff')
+        """),
+    step(
+        """
+        INSERT INTO roles(role_id, role_name, user_editable) VALUES
+          ('ade7e6b0-ba9c-4b51-87d0-2af7fe39a347', 'group-creator', '0')
+        """,
+        """
+        DELETE FROM roles WHERE role_id='ade7e6b0-ba9c-4b51-87d0-2af7fe39a347'
+        """),
+    step(
+        """
+        INSERT INTO role_privileges VALUES
+          ('ade7e6b0-ba9c-4b51-87d0-2af7fe39a347',
+           '4842e2aa-38b9-4349-805e-0a99a9cf8bff')
+        """,
+        """
+        DELETE FROM role_privileges
+        WHERE role_id='ade7e6b0-ba9c-4b51-87d0-2af7fe39a347'
+        AND privilege_id='4842e2aa-38b9-4349-805e-0a99a9cf8bff'
+        """)
+]