Fix login bug

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

@@ -50,12 +50,14 @@ const options = {
   },
 
   callbacks: {
-    session: async (session) => {
-      const { email } = session.user;
-      const url = `${process.env.SITE}/api/user/${email}`;
+    session: async (session, token) => {
+      const { id } = token.user;
+      const url = `${process.env.SITE}/api/user/${id}`;
       const res = await fetch(url, {
         method: 'GET',
-        headers: { 'Content-Type': 'application/json' },
+        headers: {
+          'Content-Type': 'application/json',
+        },
       });
       if (res.status === 200) {
         const user = await res.json();

src/pages/api/user/[id].js

@@ -0,0 +1,30 @@
+import nc from 'next-connect';
+import { ObjectID } from 'mongodb';
+import middleware from '../../../middlewares/middleware';
+
+const handler = nc()
+  .use(middleware)
+  .get(
+    async (req, res) => {
+      await req.db
+        .collection('users')
+        .findOne(
+          { _id: ObjectID(req.query.id) },
+          (err, doc) => {
+            if (doc) {
+              const {
+                name, firstName, lastName, affiliation,
+              } = doc;
+              if (err) throw err;
+              res.status(200).json({
+                name, firstName, lastName, affiliation,
+              });
+            } else {
+              res.status(404).json({ error: '404 Not Found' });
+            }
+          },
+        );
+    },
+  );
+
+export default handler;