Support FastAPI Web Applications

[bliutech]

Besides Flask, another popular framework for build Python web applications is FastAPI. While Flask is WSGI and FastAPI is ASGI, they support similar TestClient interfaces which can be used as the executor for TaintMonkey. This task involves adding support for FastAPI by implementing a TaintClient and TaintRequest equivalent to integrate the FastAPI TestClient.

https://fastapi.tiangolo.com/tutorial/testing/#using-testclient

[bliutech]

We also need to introduce an interface to distinguish between instantiating a FlaskTestClient and a FastAPITestClient. One idea is to have a factory design pattern for each of these classes. We may just need a factory method rather than a class. This can also help abstract some of the specific constructor logic we might need to require.

Resources:

• Explanation of the Factory Design Pattern: https://refactoring.guru/design-patterns/factory-method
• Factory Design Pattern in Python Example: https://refactoring.guru/design-patterns/factory-method/python/example