auth: implement OAuth2 flow.oauth2_auth_flow

Add code to implement the OAuth2 flow.

* Add test fixtures for setting up users and OAuth2 clients
* Add tests for token generation with the "Password Grant" flow
* Fix some issues with test due to changes in the database connection's
  row_factory

3 files changed, 68 insertions, 0 deletions

diff --git a/tests/unit/auth/fixtures/__init__.py b/tests/unit/auth/fixtures/__init__.py
index 7adae3f..a675fc7 100644
--- a/tests/unit/auth/fixtures/__init__.py
+++ b/tests/unit/auth/fixtures/__init__.py
@@ -5,3 +5,4 @@ from .group_fixtures import *
 from .resource_fixtures import *
 # from .privilege_fixtures import *
 from .migration_fixtures import *
+from .oauth2_client_fixtures import *
diff --git a/tests/unit/auth/fixtures/oauth2_client_fixtures.py b/tests/unit/auth/fixtures/oauth2_client_fixtures.py
new file mode 100644
index 0000000..751eadd
--- /dev/null
+++ b/tests/unit/auth/fixtures/oauth2_client_fixtures.py
@@ -0,0 +1,44 @@
+"""Fixtures for OAuth2 clients"""
+import uuid
+import json
+import datetime
+
+import pytest
+
+from gn3.auth import db
+from gn3.auth.authentication.oauth2.models.oauth2client import OAuth2Client
+
+@pytest.fixture
+def fixture_oauth2_clients(fixture_users_with_passwords):
+    """Fixture: Create the OAuth2 clients for use with tests."""
+    conn, users = fixture_users_with_passwords
+    now = datetime.datetime.now()
+
+    clients = tuple(
+        OAuth2Client(str(uuid.uuid4()), f"yabadabadoo_{idx:03}", now,
+         now + datetime.timedelta(hours = 2),
+         {
+             "client_name": f"test_client_{idx:03}",
+             "scope": ["user", "profile"],
+             "redirect_uri": "/test_oauth2",
+             "token_endpoint_auth_method": [
+                 "client_secret_post", "client_secret_basic"],
+             "grant_types": ["password"]
+         }, user)
+        for idx, user  in enumerate(users, start=1))
+
+    with db.cursor(conn) as cursor:
+        cursor.executemany(
+            "INSERT INTO oauth2_clients VALUES (?, ?, ?, ?, ?, ?)",
+            ((str(client.client_id), client.client_secret,
+              int(client.client_id_issued_at.timestamp()),
+              int(client.client_secret_expires_at.timestamp()),
+              json.dumps(client.client_metadata), str(client.user.user_id))
+            for client in clients))
+
+    yield conn, clients
+
+    with db.cursor(conn) as cursor:
+        cursor.executemany(
+            "DELETE FROM oauth2_clients WHERE client_id=?",
+            ((str(client.client_id),) for client in clients))
diff --git a/tests/unit/auth/fixtures/user_fixtures.py b/tests/unit/auth/fixtures/user_fixtures.py
index cc43a74..843d575 100644
--- a/tests/unit/auth/fixtures/user_fixtures.py
+++ b/tests/unit/auth/fixtures/user_fixtures.py
@@ -2,6 +2,7 @@
 import uuid
 
 import pytest
+import bcrypt
 
 from gn3.auth import db
 from gn3.auth.authentication.users import User
@@ -41,3 +42,25 @@ def test_users(conn_after_auth_migrations):# pylint: disable=[redefined-outer-na
              ("21351b66-8aad-475b-84ac-53ce528451e3",),
              ("ae9c6245-0966-41a5-9a5e-20885a96bea7",),
              ("9a0c7ce5-2f40-4e78-979e-bf3527a59579",)))
+
+@pytest.fixture(scope="function")
+def fixture_users_with_passwords(test_users): # pylint: disable=[redefined-outer-name]
+    """Fixture: add passwords to the users"""
+    conn, users = test_users
+    user_passwords_params = tuple(
+        (str(user.user_id), bcrypt.hashpw(
+            f"password_for_user_{idx:03}".encode("utf8"),
+            bcrypt.gensalt()))
+        for idx, user in enumerate(users, start=1))
+
+    with db.cursor(conn) as cursor:
+        cursor.executemany(
+            "INSERT INTO user_credentials VALUES (?, ?)",
+            user_passwords_params)
+
+    yield conn, users
+
+    with db.cursor(conn) as cursor:
+        cursor.executemany(
+            "DELETE FROM user_credentials WHERE user_id=?",
+            ((item[0],) for item in user_passwords_params))