Bugfix: Extract visitor data from sw.js_data API instead of randomly…

[sheepmax]

In #1262, visitor data was randomly generated for the iOS client, but this has recently broken. This PR tries to extract this data from https://www.youtube.com/sw.js_data as suggested by @gechoto in TeamNewPipe/NewPipe#11980. Works on NewPipe, with the expected behaviour of videos properly loading. Also took it for a spin with a bike ride :)

The solution doesn't feel very robust, but further work on parsing the all the data coming from this endpoint is not something I'm knowledgeable about.

• I carefully read the contribution guidelines and agree to them.
• I have tested the API against NewPipe.
• I agree to create a pull request for NewPipe as soon as possible to make it compatible with the changed API.

[AudricV]

Thanks for your PR.

I used a different approach which has the benefit of getting a visitorData with a specific InnerTube client from two InnerTube endpoints in #1272, so I'm closing this PR in favor of the one I linked.

Once again, I thank you for your pull request and I am sorry to have to close it :(

[sheepmax]

No worries, @AudricV. I mostly wanted a quick fix for myself, your solution looks much more robust of course. If I may ask, I'm very new to this and confused about where to learn about inner API details. How do you do it yourself?

[Atemu]

@AudricV given that there hasn't been any significant movement on #1272 in the past few days and that it does quite a bit more than just apply a quick fix to make things work again, could we have this merged first and then simply reverted whenever #1272 is ready to roll?

[AudricV]

No, that's not something we plan to do.