Error refreshing token

[micahdlamb]

I noticed there is an error in the token refreshing code.

You are using the "Authorization": "Bearer " + access_token header but spotify wants you to use the "Authorization": f"Basic {token.decode()}" like is used your HttpClient.get_bearer_info function.

I worked around the problem by overloading User._refreshing_token with this code:

    async def _refreshing_token(self, expires: int, token: str):
        while True:
            import asyncio
            await asyncio.sleep(expires-1)
            REFRESH_TOKEN_URL = "https://accounts.spotify.com/api/token?grant_type=refresh_token&refresh_token={refresh_token}"
            route = ("POST", REFRESH_TOKEN_URL.format(refresh_token=token))
            from base64 import b64encode
            auth = b64encode(":".join((os.environ['SPOTIFY_CLIENT_ID'], os.environ['SPOTIFY_CLIENT_SECRET'])).encode())
            try:
                data = await self.client.http.request(
                    route,
                    headers={"Content-Type": "application/x-www-form-urlencoded",
                             "Authorization": f"Basic {auth.decode()}"}
                )

                expires = data["expires_in"]
                self.http.token = data["access_token"]
                print('token refreshed', data["access_token"])
            except:
                import traceback
                traceback.print_exc()

Also in I believe you want to change:
"Content-Type": kwargs.get("content_type", "application/json"),

to

"Content-Type": kwargs.pop("content_type", "application/json"),

in HTTPClient.request otherwise it errors when the content_type kwd is passed on.

I could do a pull request if you'd like. I really like your library, its very pythonic and much easier to use than the other spotify libraries I tried.

[mental32]

Damn nice catch, yeah if you can submit a pr I can merge it immediately.

I don't have access to my machine atm so I won't be able to fix this for a couple of hours

[mental32]

Keep in mind, If I merge, the changes will still have to wait until I can release them to pypi

[micahdlamb]

Great, I'll take a stab at a pull request. I've never done one before. It will probably take me a day or two.

I was also thinking about the way you are implementing this... If I had lots of users connect to my app then I believe this would keep refreshing all their tokens indefinitely. Is there a way to stop the refreshing if I'm done with the user? I was thinking another way this could be done is to detect when an api call fails and do the refreshing then. I'm curious how other oauth applications handle this.

[mental32]

User objects have a refresh attribute that is a read only reference to the task handling the session refreshing, you can stop refreshing a user's token by cancelling the task with User.refresh.cancel()

Currently there is no mechanism in place to deal with a refresh task failing part way, I'd recommend just creating a new user oauth http session and discarding the old user object in this case.

I haven't looked into how other apps handle this situation but if you can find alternatives I'm happy to consider them :)

[micahdlamb]

Oh awesome, I didn't realize user.refresh was an _asyncio.Task and I can call cancel on it. In any case I think its a mistake for me to be holding onto the User objects for so long. I'm gonna think about it more next weekend.