Feature/access token magic 2

[pekasen]

Adds an AccessToken class that automatically gets and refreshes the bearer token from the OAuth endpoint.

Tests are updated as well. However, in tests for get_liked_videos and get_user_followers is an assertion error. I suggest retaining the tests as they are and fixing them, when merging with the refactored social graph implementations.

[tomasruizt]

I personally think that simple caching with a time expiration does the job:

@ttl_cache(ttl=7200 - 1)  # to be safe
def get_access_token_cached() -> str:
    client_key = os.environ["TIKTOK_CLIENT_KEY"]
    client_secret = os.environ["TIKTOK_CLIENT_SECRET"]
    logger.info("Getting access token...")
    data: dict = get_access_token(
        client_key=client_key, client_secret=client_secret
    )
    return data["access_token"]

but if you like this class-based solution, fine with me :)

[pekasen]

I personally think that simple caching with a time expiration does the job:

@ttl_cache(ttl=7200 - 1)  # to be safe
def get_access_token_cached() -> str:
    client_key = os.environ["TIKTOK_CLIENT_KEY"]
    client_secret = os.environ["TIKTOK_CLIENT_SECRET"]
    logger.info("Getting access token...")
    data: dict = get_access_token(
        client_key=client_key, client_secret=client_secret
    )
    return data["access_token"]

but if you like this class-based solution, fine with me :)

See your point, there's definitely elegance to it. However, I'd like a solution where the API is in control of the expiration time. I'll check whether I can provide a simpler solution.