added mail service

lib/tokens.ts

@@ -0,0 +1,32 @@
+import { v4 as uuid } from 'uuid'
+import {
+  VERIFICATION_TOKEN_EXPIRATION_DURATION,
+} from '@/config/auth'
+import { db } from '@/lib/db'
+import { getVerificationTokenByEmail } from '@/data/verification-token'
+
+export const generateVerificationToken = async (email: string) => {
+  const token = uuid()
+  const expires = new Date(
+    new Date().getTime() + VERIFICATION_TOKEN_EXPIRATION_DURATION)
+
+  const existingToken = await getVerificationTokenByEmail(email)
+
+  if (existingToken) {
+    await db.verificationToken.delete({
+      where: {
+        id: existingToken.id,
+      },
+    })
+  }
+
+  const verificationToken = await db.verificationToken.create({
+    data: {
+      email,
+      token,
+      expires,
+    },
+  })
+
+  return verificationToken
+}