Add top campaign clients endpoint

backend/routes/campaignRoutes.js

@@ -1,14 +1,24 @@
 const express = require('express');
-const { verifyToken } = require('../auth');
+const { authenticateAPIKey, verifyToken } = require('../auth');
 const {
     getCampaignPreview,
     getCampaignQueueSummary,
+    getTopClientsForCampaign,
     processPendingStockCampaigns,
     retryCampaignItems
 } = require('../services/campaignService');
 
 const router = express.Router();
 
+const verifyCampaignExportAccess = (req, res, next) => {
+    if (req.headers['x-api-key']) {
+        authenticateAPIKey(req, res, next);
+        return;
+    }
+
+    verifyToken(req, res, next);
+};
+
 router.get('/campaigns', verifyToken, async (req, res) => {
     try {
         res.json(await getCampaignQueueSummary());
@@ -27,6 +37,15 @@ router.get('/campaigns/preview', verifyToken, async (req, res) => {
     }
 });
 
+router.get('/campaigns/top-clients', verifyCampaignExportAccess, async (req, res) => {
+    try {
+        res.json(await getTopClientsForCampaign(req.query || {}));
+    } catch (error) {
+        console.error('Error fetching top campaign clients:', error);
+        res.status(500).json({ error: 'Internal Server Error' });
+    }
+});
+
 router.post('/campaigns/process', verifyToken, async (req, res) => {
     try {
         res.json(await processPendingStockCampaigns());