Install script should lowercase all domain names

[ocdtrekkie]

A new user submitted the following error to the mailing list today when trying to set up Google login on a new Sandcats install:

{"line":"405","file":"oauth_server.js","message":"Error in OAuth Server: redirectUrl (https://example.sandcats.io/setup/user) is not on the same host as the app (https://EXample.sandcats.io/)","time":{"$date":1657666882313},"level":"warn"} Exception while invoking method 'login' Error: Failed to complete OAuth handshake with Google. failed [400] { "error": "redirect_uri_mismatch", "error_description": "Bad Request" } at getTokens (packages/google-oauth/google_server.js:105:7) at Object.getServiceData [as handleOauthRequest] (packages/google-oauth/google_server.js:80:58) at OAuth._requestHandlers.<computed> (packages/oauth2/oauth2_server.js:10:33) at middleware (packages/oauth/oauth_server.js:170:5) at /programs/server/npm/node_modules/meteor/promise/node_modules/meteor-promise/fiber_pool.js:43:40

The user had registered EXample as his subdomain instead of example, and Google OAuth failed to match that. Attempting to use capital letters with Google OAuth in any way seemed to throw it off. The user ended up reinstalling with the lowercase version of his subdomain.

Note that I do not know if Sandcats deduplicates capitalized and lowercase subdomains in registrations, so I am unsure if the user had to recover the subdomain or if it allowed re-registration, or if it kept the existing keys during the uninstall and reinstall process.

But I think we should adjust the install script to lowercase all domain names and Sandcats subdomains automatically.

[xet7]

@ocdtrekkie

So I presume it's also OK for non-ascii domain names because they use punycode?

[ocdtrekkie]

I am not sure about non-ASCII domains, but my understanding is browsers (and most other things that handle DNS) will lowercase capital ASCII characters to lowercase ASCII characters, aka, Alpha.SaNdStOrM.io will automagically always navigate to alpha.sandstorm.io

[zenhack]

Assuming we do lowercasing after punycode encoding it should be fine, yeah.

And yes, DNS is case-insensitive (for ascii; in general different languages don't even always agree on what characters are different cases of the same letter. E.g. in turkish a captial i is İ and a lower case I is ı).