added the route

lib/api/verifyByCredentials.ts

@@ -0,0 +1,63 @@
+import { prisma } from "./db";
+import { User } from "@prisma/client";
+import verifySubscription from "./verifySubscription";
+import bcrypt from "bcrypt";
+
+type Props = {
+  username: string;
+  password: string;
+};
+
+const STRIPE_SECRET_KEY = process.env.STRIPE_SECRET_KEY;
+const emailEnabled =
+  process.env.EMAIL_FROM && process.env.EMAIL_SERVER ? true : false;
+
+export default async function verifyByCredentials({
+  username,
+  password,
+}: Props): Promise<User | null> {
+  const user = await prisma.user.findFirst({
+    where: emailEnabled
+      ? {
+          OR: [
+            {
+              username: username.toLowerCase(),
+            },
+            {
+              email: username?.toLowerCase(),
+            },
+          ],
+        }
+      : {
+          username: username.toLowerCase(),
+        },
+    include: {
+      subscriptions: true,
+    },
+  });
+
+  if (!user) {
+    return null;
+  }
+
+  let passwordMatches: boolean = false;
+
+  if (user?.password) {
+    passwordMatches = bcrypt.compareSync(password, user.password);
+
+    if (!passwordMatches) {
+      return null;
+    } else {
+      if (STRIPE_SECRET_KEY) {
+        const subscribedUser = await verifySubscription(user);
+
+        if (!subscribedUser) {
+          return null;
+        }
+      }
+      return user;
+    }
+  } else {
+    return null;
+  }
+}