jsx
      response = await fetch("/api/auth/wallet", {
        method: "POST",
        headers: {
          "Content-Type": "application/json",
          Accept: "application/json",
        },
        body: JSON.stringify({
          walletAddr,
          nonce,
          signature,
        }),
      });

      const { user, token } = await response.json();
      supabase.auth.setAuth(token);

jsx

const walletApi = async (req: any, res: any) => {
    try {
        ...
        // variables stuff above
        let { data: user, error }: any = await supabase
            .from("users")
            .select("*")
            .eq('walletAddr', signerAddr)
            .eq('nonce', nonce)
        
        const token = jwt.sign(
            {
                aud: "authenticated",
                exp: Math.floor(Date.now() / 1000) + (60 * 60 * 24 * 7),
                sub: user.id,
                user_metadata: {
                    id: user.id,
                },
                role: "authenticated"
            },
            jwtSecret as string
        );

        res.status(200).json({ user, token })
    } catch (err: any) {
        res.status(400).json({ error: err.message });
    }
}

export default walletApi

jsx
 useEffect(() => {
    supabase.auth.onAuthStateChange(async (event, session) => {
      console.log("Running an auth state change");
      let newUser = supabase.auth.user();
      if (newUser) {
        await fetch("/api/auth/set", {
          method: "POST",
          headers: new Headers({ "Content-Type": "application/json" }),
          credentials: "same-origin",
          body: JSON.stringify({ event, session }),
        });
      }
      setUser(supabase.auth.user() || undefined);
    });
  });

/api/auth/set

ts
import { NextApiRequest, NextApiResponse } from "next";
import supabase from "lib/pSupabase";

export default async function handler(
  req: NextApiRequest,
  res: NextApiResponse
) {
  await supabase.auth.api.setAuthCookie(req, res);
}

if (data.length > 0) {
    console.log("Updating nonce");
    let data = await supabase
      .from("users")
      .update({ nonce })
      .match({ walletAddr });
    console.log(data);
  } else if (data.length === 0) {
    console.log("Inserting nonce");
    let data = await supabase.from("users").insert({ walletAddr, nonce });
  }

  res.status(200).json({ nonce });