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That will allow interaction between client and authentication attempts. It also shows how cumbersome it is to deal with all these generics ... but hey, you gotta do what you gotta do. If boxes of pointers would be used, it would be easier to handle, but enforces a certain memory model. That, of course, is not desired.
Youtube is a library written in Rust to help interacting with your youtube account. For now, all functionality is geared towards allowing interruptible video uploads and adjustments of video meta-data.
The library works using the builder pattern. If builders are instantiated, you will need to provide the minimal information right off the bat. Further calls to the builder allow to configure it. Some configuration will be in the form of callbacks, which allows you to control internal loops or behaviour.
It's the goal of each builder to maximize the chances of a successful result, and it will provide enough callbacks to be resilient against network errors, and authorization failures which require the token to be refreshed.
You will need authorization to perform most of the operations implemented here - it can be obtained and handled using the yup-oauth2 library.