verify human when Login (ex: reCAPTCHA)

[EasonC13]

Hi I have a jupyter lab service that can be login remotely by password.

However, Jupyter's remote login feature was easy to abuse. For example, hackers might get the password via brute-force approaches.

Thus, I think that if jupyter has a reCAPTCHA add-on, it might ease the problem mentioned above. like file browser.

I want to know what do you think. Thank you. (This might can be the final project of my current course.)

For example, it will be like:

1. User create a reCAPTCHA key from reCAPTCHA service.
2. User add reCAPTCHA key to jupyter_notebook_config.py and enable reCAPTCHA feature
3. When users login from https://server/login, aside from entering the password, they also need to click 'I am a human' at reCAPTCHA and the backend will verify both password and reCAPTCHA token for authentication.

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