check domain configuration before starting Invidious

[Fijxu]

Closes #5351

[SamantazFox]

domain can be empty on local instances.

[SamantazFox]

Suggested change

	puts "Config: 'domain' is invalid.
	puts "Config: 'domain' is invalid."

[SamantazFox]

By the way you can use String.presence instead of a separate nil/empty check

Suggested change

	if (domain = config.domain).nil? || domain.empty?
	if !config.domain.presence

[unixfox]

@Fijxu could you check @SamantazFox reviews :)?

[Fijxu]

I did something more complicated while testing but this seems to be enough.

$ INVIDIOUS_DOMAIN=https://inv.nadeko.net:8080/meow/asd/meow ./invidious
Config (Hint): Remove the path from your domain: '/meow/asd/meow'
$ INVIDIOUS_DOMAIN=https://inv.nadeko.net:8080 ./invidious
Config (Hint): Remove the scheme from your domain: 'https://'
$ INVIDIOUS_DOMAIN=inv.nadeko.net:8080 ./invidious
Config (Hint): Remove the port from your domain: ':8080'
$ INVIDIOUS_DOMAIN=inv.nadeko.net/asd/asd/asd ./invidious
Config (Hint): Remove the path from your domain: '/asd/asd/asd'
$ INVIDIOUS_DOMAIN=https://inv.nadeko.net ./invidious
Config (Hint): Remove the scheme from your domain: 'https://'
$ INVIDIOUS_DOMAIN=tcp://inv.nadeko.net ./invidious
Config (Hint): Remove the scheme from your domain: 'tcp://'
$ INVIDIOUS_DOMAIN=meow ./invidious
[development] Invidious is ready to lead at http://0.0.0.0:30001

$ INVIDIOUS_DOMAIN=meow.localhost ./invidious
[development] Invidious is ready to lead at http://0.0.0.0:30001

$ INVIDIOUS_DOMAIN=meow.localhost.lol ./invidious
[development] Invidious is ready to lead at http://0.0.0.0:30001

[unixfox]

Thanks @Fijxu and with empty domain?

[Fijxu]

Thanks @Fijxu and with empty domain?

INVIDIOUS_DOMAIN="" ./invidious
[development] Invidious is ready to lead at http://0.0.0.0:30001

The Set-Cookie header has no domain property when trying to log in since INVIDIOUS_DOMAIN is empty, as it should be: SID=<some_sid>; expires=Wed, 16 Feb 2028 17:11:37 GMT; HttpOnly; SameSite=Lax, so works fine ;)