Maintain the locale in the subpath when a redirect occurs

[vgolemis]

Your question
How to maintain the locale intact using NextAuth.js and Sub-path Routing?

What are you trying to do
Next.js v10 introduced built-in support for internalization. I use this functionality for my application and specifically the Sub-path Routing. To give you an example, the default locale is English and does not have a prefix (https://www.example.com/blog) and the Greek locale has the el prefix (https://www.example.com/el/blog). When I change the route to e.g. /support The Next Router will keep the prefix intact and redirect the user to https://www.example.com/el/support. I have integrated NextAuth in my application and I have created a custom login page and also a page where new users land to setup their profile for the first time. For that, I used the following pages options:

  pages: {
    signIn: '/auth/signin',
    newUser: '/account/setup'
  }

Let's assume that the user is in the Greek locale. When he selects to login, I use the singin api and NextAuth will redirect the user to https://www.example.com/auth/signin instead of https://www.example.com/el/auth/signin. This, of course, results in a change of the locale and the user will land in a page that is in English instead of Greek. I bypassed this issue by using the Next Router to redirect to /auth/signin and the callbackURL option of the signin api (thus I am not letting NextAuth do the routing). What I cannot resolve is the newUser redirect that occurs only for newly created users. As you can imagine I faced the same issue and the user ends up in https://www.example.com/account/setup instead of https://www.example.com/el/account/setup. I tried using callbacks but I couldn't make it work properly. Is there anything I can do to resolve this localization issue?

Feedback
Documentation refers to searching through online documentation, code comments and issue history. The example project refers to next-auth-example.

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