Authentication - which cookies?

[skirk-mpr]

When reviewing Developer tools, it seems that there are a lot of cookies set for YouTube - I'd be happy to PR some documentation updates to the Authentication section if someone could tell me which cookies are required?

I did find some response to other questions which listed some but it may be outdated (e.g. it references VISITOR_INFO but I only see VISITOR_INFO1_LIVE in Developer tools).

#376 (comment)

	var cookies = new List<Cookie>()
	{
		new("YSC","**VALUE**", "/", ".youtube.com"),
		new("PREF","**VALUE**", "/", ".youtube.com"),
		new("VISITOR_INFO1_LIVE","**VALUE**", "/", ".youtube.com"),
		new("SID","**VALUE**", "/", ".youtube.com"),
		new("HSID","**VALUE**", "/", ".youtube.com"),
		new("SSID","**VALUE**", "/", ".youtube.com"),
		new("APISID","**VALUE**", "/", ".youtube.com"),
		new("SAPISID","**VALUE**", "/", ".youtube.com"),
		new("LOGIN_INFO","**VALUE**", "/", ".youtube.com"),
	}.AsReadOnly();

	var client = new YoutubeClient(cookies);

When trying the above (but with the actual cookie values ) to access one of my private playlists with
Playlists.GetVideosAsync("XXXX") I get a PlaylistUnavailableException which I assuming means, I'm not authenticated with the client to reach the non-public playlist.

[Tyrrrz]

I know for a fact that APISID/SAPISID are required, but not sure if the others are not. You can see here how they're used:

YoutubeExplode/YoutubeExplode/YoutubeHttpHandler.cs

Lines 46 to 70 in 3118f02

	private string? TryGenerateAuthHeaderValue(Uri uri)
	{
	var cookies = _cookieContainer.GetCookies(uri).Cast<Cookie>().ToArray();
	var sessionId =
	cookies
	.FirstOrDefault(
	c => string.Equals(c.Name, "__Secure-3PAPISID", StringComparison.Ordinal)
	)
	?.Value
	?? cookies
	.FirstOrDefault(c => string.Equals(c.Name, "SAPISID", StringComparison.Ordinal))
	?.Value;
	if (string.IsNullOrWhiteSpace(sessionId))
	return null;
	var timestamp = DateTimeOffset.UtcNow.ToUnixTimeSeconds();
	var domain = uri.GetDomain();
	var token = $"{timestamp} {sessionId} {domain}";
	var tokenHash = Hash.Compute(SHA1.Create(), Encoding.UTF8.GetBytes(token)).ToHex();
	return $"SAPISIDHASH {timestamp}_{tokenHash}";
	}