Allow for self-solved anti-captcha

With the changes they appear to have recently made that now requires solving a captcha even for logging in (see info in #169), the script doesn’t even allow for downloading books you already own without setting up anti-captcha.

I have no interest in setting up or subscribing to an anti-captcha service, but I’m happy to solve the captcha myself manually, I just need a way to do so and provide that to the script so I can download my owned content (packt-cli -da).

[supachris28]

The Recaptcha on login is only enabled sometimes.

There are other endpoints that can be used with the access token and refresh token that a successful login grants, to get new valid tokens, following the OAuth2 model. I.e. once you have successfully authenticated, you can reauthenticate using your tokens at least every 30 days without using the username and password.

This would mean the Recaptcha does not affect your ability to download titles.

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Please note this is not an endorsement of any activity.

[mjenczmyk]

I see it may be quite easy using browser-cookie3, I’ll try to do it in spare time (I cannot promise any particular deadline though, I just promise I’ll have that in my mind).