Validação de nome de usuário Unicode (Russo) falha aleatoriamente

[Alex_P]

Nomes de usuário com caracteres em russo, como фыв (não tenho certeza se depende de caracteres específicos), às vezes falham na validação.

Testado no Chrome e Firefox mais recentes no Ubuntu 19.10. A versão do Discourse é 2.4.0.beta8 (16de46f8d4).

Parece que a solicitação HTTP é sempre a mesma para esses 3 caracteres, reproduzida repetidamente várias vezes no Console do DevTools:

fetch('/u/check_username?username=%D1%84%D1%8B%D0%B2&email=', {headers: {'X-Requested-With': 'XMLHttpRequest'}}).then(r => r.json()).then(console.log)

Tentei definir a lista branca de Unicode [йцукенгшщзхъфывапролджэячсмитьбюЙЦУКЕНГШЩЗХЪФЫВАПРОЛДЖЭЯЧСМИТЬБЮёЁ], sem efeito.

[sam (Sam Saffron)]

@gerhard any idea what is going on here? Is our Russian regex incorrect?

[gerhard (Gerhard Schlager)]

I can’t reproduce the issue. Any chance that you entered some kind of invisible whitespace or something like that when it showed you the “must only include numbers, letters, dashes, dots, and underscores” error message?

The username check runs on the server, so if there was a problem with the regex, it should always generate the same results for the same input.

[Alex_P]

@gerhard

The username check runs on the server, so if there was a problem with the regex, it should always generate the same results for the same input.

Yes, that’s why it’s strange.

I thought that it could be related to some kind of rate limiting, but now I got the error even after a long pause (2 minutes) on the first request, and then success on the third request in several seconds.

@gerhard

Any chance that you entered some kind of invisible whitespace or something like that when it showed you the “must only include numbers, letters, dashes, dots, and underscores” error message?

I can reproduce it executing the code above in DevTools.

[gerhard (Gerhard Schlager)]

I’m still not able to reproduce the issue. Could you please try to disable and reenable the unicode usernames site setting? Maybe a unicorn worker didn’t get the memo that the setting changed. That would explain why only some of the requests result in an error. If that doesn’t help, try rebuilding the app container.

[Alex_P]

@gerhard

Could you please try to disable and reenable the unicode usernames site setting?

It didn’t help, but yes, I cannot reproduce it too in my local Docker instance and looks like it disappeared after restart when upgrading Discourse.

btw if anyone is looking for a simpler way to whitelist Russian letters, looks like this regex works: [\p{Cyrillic}]