Use CR-unblocker service to obtain session cookies for crunchyroll geo-bypass

[ratchetfreak]

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CR-unblocker uses a US-based server that logs into crunchyroll and returns cookies to let the session pretend it started in the US which lets users elsewhere access geo-locked content.

I propose to add this as an opt-in to youtube-dl.

1. download page from crunchyroll with current cookies

2. if page contains the following tag in the footer

   <img id="footer_country_flag" src="http://static.ak.crunchyroll.com/i/country_flags/us.gif" alt="United States of America" title="Your detected location is United States of America.">

   then continue as normal.

3. otherwise make request to cr-unblocker server (either default or user specified if running their own) with any log-in information passed.

4. adjust the current cookies using the response (in particular set sess_id and session_id to the response's session_id) and restart from 1 or fail out if trying too many times/ran out of log-in servers to try.

The code that runs in the browser extension can be found in their repo: https://github.com/onestay/CR-Unblocker/blob/master/src/background_script.js (licensed under MIT)

current maintainer of cr-unblocker doesn't mind the server being used by youtube-dl: https://github.com/onestay/CR-Unblocker/issues/12 but punted it over to someone else to maintain it.