implemented login

auth.ts

@@ -0,0 +1,67 @@
+/**
+ * @module auth
+ * @description verifies user credentials during the log-in action (i.e. against a database)
+ * @exports exports `auth`, `signIn`, `signOut` actions
+ */
+import NextAuth from 'next-auth';
+import { authConfig } from './auth.config';
+import Credentials from 'next-auth/providers/credentials';
+import { z } from 'zod';
+// import bcrypt from 'bcrypt';
+import { User } from '@/app/lib/types/User';
+
+const dummyUser:User = {
+  id: "1",
+  email: "nikola.derezic@gmail.com",
+  password: "123456",
+  name: "Nikola Derezic"
+};
+
+async function getUser(email: string): Promise<User | undefined> {
+  // temporary use dummyUser instead of db
+  if(email === dummyUser.email) {
+    return dummyUser;
+  }
+
+  return undefined;
+
+    // try {
+    //   const user = await sql<User>`SELECT * FROM users WHERE email=${email}`;
+    //   return user.rows[0];
+    // } catch (error) {
+    //   console.error('Failed to fetch user:', error);
+    //   throw new Error('Failed to fetch user.');
+    // }
+  }
+
+export const { auth, signIn, signOut } = NextAuth({
+  ...authConfig,
+
+  providers: [
+        Credentials({
+            async authorize(credentials) {
+                const parsedCredentials = z.object({
+                    email: z.string().email(),
+                    password: z.string().min(6)
+                }).safeParse(credentials);
+
+                if (!parsedCredentials.success) {
+                    return null;
+                }
+
+                const { email, password } = parsedCredentials.data;
+
+                const user = await getUser(email);
+
+               if (!user) return null;
+
+                // const passwordsMatch = await bcrypt.compare(password, user.password);
+                const passwordsMatch = password === user.password;
+
+                if (!passwordsMatch) return null;
+
+                return user;
+            }
+        })
+    ],
+});