Finish admin dashboard and update sql

utils/helper.js

@@ -0,0 +1,48 @@
+const { generateEmailTransporter } = require("./mail");
+
+// Helper function to send email
+async function sendVerificationEmail(email, verificationCode) {
+  const transporter = generateEmailTransporter();
+
+  // Send the email with Zoho
+  await transporter.sendMail({
+    from: "campusplug@zohomailcloud.ca",
+    to: email,
+    subject: "Campus Plug: Signup Verification Code",
+    text: `Your verification code is: ${verificationCode}. This code will expire in 15 minutes.`,
+    html: `<p>Your verification code is: <strong>${verificationCode}</strong></p><p>This code will expire in 15 minutes.</p>`,
+  });
+
+  console.log(`Verification code sent to ${email}`);
+}
+
+// Clean up expired verification codes (run this periodically)
+function cleanupExpiredCodes() {
+  db_con.query(
+    "DELETE FROM AuthVerification WHERE Date < DATE_SUB(NOW(), INTERVAL 15 MINUTE) AND Authenticated = 0",
+    (err, result) => {
+      if (err) {
+        console.error("Error cleaning up expired codes:", err);
+      } else {
+        console.log(`Cleaned up ${result} expired verification codes`);
+      }
+    }
+  );
+}
+
+const checkDatabaseConnection = async (db) => {
+  try {
+    const connection = await db.getConnection();
+    //If no error, release the connection
+    console.log("Connect to database successfully!");
+    connection.release();
+  } catch (error) {
+    console.log("Cannot connect to database: ", error.sqlMessage);
+  }
+};
+
+module.exports = {
+  sendVerificationEmail,
+  cleanupExpiredCodes,
+  checkDatabaseConnection,
+};