fix referrer logic to work with lnauth/nostr auth

pages/api/auth/[...nextauth].js

@@ -51,6 +51,17 @@ function getCallbacks (req) {
         // token won't have an id on it for new logins, we add it
         // note: token is what's kept in the jwt
         token.id = Number(user.id)
+
+        // if referrer exists, set on user
+        // isNewUser doesn't work for nostr/lightning auth because we create the user before nextauth can
+        // this means users can update their referrer if they don't have one, which is fine
+        if (req.cookies.sn_referrer && user?.id) {
+          const referrer = await prisma.user.findUnique({ where: { name: req.cookies.sn_referrer } })
+          if (referrer) {
+            await prisma.user.updateMany({ where: { id: user.id, referrerId: null }, data: { referrerId: referrer.id } })
+            notifyReferral(referrer.id)
+          }
+        }
       }
 
       if (token?.id) {
@@ -60,18 +71,8 @@ function getCallbacks (req) {
         token.sub = Number(token.id)
       }
 
-      if (isNewUser) {
-        // if referrer exists, set on user
-        if (req.cookies.sn_referrer && user?.id) {
-          const referrer = await prisma.user.findUnique({ where: { name: req.cookies.sn_referrer } })
-          if (referrer) {
-            await prisma.user.update({ where: { id: user.id }, data: { referrerId: referrer.id } })
-            notifyReferral(referrer.id)
-          }
-        }
-
       // sign them up for the newsletter
-        if (user?.email && process.env.LIST_MONK_URL && process.env.LIST_MONK_AUTH) {
+      if (isNewUser && user?.email && process.env.LIST_MONK_URL && process.env.LIST_MONK_AUTH) {
         fetch(process.env.LIST_MONK_URL + '/api/subscribers', {
           method: 'POST',
           headers: {
@@ -87,7 +88,6 @@ function getCallbacks (req) {
           })
         }).then(async r => console.log(await r.json())).catch(console.log)
       }
-      }
 
       return token
     },