Local API (#982)

* Introduce API scelleton

* Raw impl for session

* Simple state endpoint

* Apply _body naming

* Finalize session testing and comment out tons of useless code

* Clean and refactor part1

* Clean and refactor part2

* Clean and refactor part2

* Clean and refactor part2

* Clean and refactor part2

* Refactor middleware

* Refactor middleware

* Clean and refactor part3

* TDD and 2 beers

* TDD and 2 beers

* Complete state endpoints

* You can only set what is already present

* Use only JSON as response

* Use default logger

* Improve auth extraction

* Extend api command with more args

* Adjust API messages

tests/test_session_manager.py

@@ -0,0 +1,45 @@
+import secrets
+from datetime import timedelta
+
+from facefusion.session_manager import clear_session, create_session, get_session, set_session, validate_session
+
+
+def test_get_and_set_session() -> None:
+	session = create_session()
+	access_token = secrets.token_urlsafe(128)
+
+	set_session(access_token, session)
+
+	assert get_session(access_token) == session
+
+
+def test_validate_session() -> None:
+	session = create_session()
+	access_token = secrets.token_urlsafe(128)
+
+	set_session(access_token, session)
+
+	assert validate_session(access_token) is True
+
+	set_session(access_token,
+	{
+		'access_token': session.get('access_token'),
+		'refresh_token': session.get('refresh_token'),
+		'created_at': session.get('created_at'),
+		'expires_at': session.get('expires_at') - timedelta(hours = 1)
+	})
+
+	assert validate_session(access_token) is False
+
+
+def test_clear_session() -> None:
+	session = create_session()
+	access_token = secrets.token_urlsafe(128)
+
+	set_session(access_token, session)
+
+	assert validate_session(access_token) is True
+
+	clear_session(access_token)
+
+	assert validate_session(access_token) is None