45 lines
1.5 KiB
TypeScript
45 lines
1.5 KiB
TypeScript
import { parse } from "accept-language-parser";
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import type { GetTokenParams } from "next-auth/jwt";
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import { getToken } from "next-auth/jwt";
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/**
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* This is a slimmed down version of the `getServerSession` function from
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* `next-auth`.
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*
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* Instead of requiring the entire options object for NextAuth, we create
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* a compatible session using information from the incoming token.
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*
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* The downside to this is that we won't refresh sessions if the users
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* token has expired (30 days). This should be fine as we call `/auth/session`
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* frequently enough on the client-side to keep the session alive.
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*/
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export const getLocale = async (req: GetTokenParams["req"]): Promise<string> => {
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const token = await getToken({
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req,
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});
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const tokenLocale = token?.["locale"];
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if (tokenLocale) {
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return tokenLocale;
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}
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const acceptLanguage =
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req.headers instanceof Headers ? req.headers.get("accept-language") : req.headers["accept-language"];
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const languages = acceptLanguage ? parse(acceptLanguage) : [];
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const code: string = languages[0]?.code ?? "";
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const region: string = languages[0]?.region ?? "";
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// the code should consist of 2 or 3 lowercase letters
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// the regex underneath is more permissive
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const testedCode = /^[a-zA-Z]+$/.test(code) ? code : "en";
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// the code should consist of either 2 uppercase letters or 3 digits
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// the regex underneath is more permissive
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const testedRegion = /^[a-zA-Z0-9]+$/.test(region) ? region : "";
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return `${testedCode}${testedRegion !== "" ? "-" : ""}${testedRegion}`;
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};
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