[Backend] Limiting the Number of upvotes/downvotes a particular user can do Fixed

backend/app.js

@@ -4,6 +4,7 @@
 const responseTime = require('response-time');
 const routes = require('./app/routes');
 const { errorHandler } = require('./helpers/error');
+const cookieParser = require('cookie-parser');
 require('colors');
 require('./helpers/dbConnection');
 
@@ -24,6 +25,9 @@
 // Response time
 app.use(responseTime({ suffix: false }));
 
+// cookie
+app.use(cookieParser());
+
 // Use routes
 app.use('/', routes);
 

backend/app/routes/Q&A/question/downvoteQuestion.js

@@ -2,6 +2,7 @@ const to = require('await-to-js').default;
 const question = require('../../../models/question');
 const { ErrorHandler } = require('../../../../helpers/error');
 const constants = require('../../../../constants');
+const { getVoteCookieName } = require('../../../../helpers/middlewares/cookie');
 
 module.exports = async (req, res, next) => {
   const { questionId } = req.body;
@@ -35,6 +36,7 @@ module.exports = async (req, res, next) => {
     return next(error);
   }
 
+  res.cookie(getVoteCookieName('question', questionId), true, { maxAge: 20 * 365 * 24 * 60 * 60 * 1000 });
   res.status(200).send({
     message: 'Question has been down voted',
   });

backend/app/routes/Q&A/question/index.js

@@ -9,6 +9,7 @@ const downvoteQuestion = require('./downvoteQuestion');
 const updateQuestionStatus = require('./updateQuestionStatus');
 const { authMiddleware } = require('../../../../helpers/middlewares/auth');
 const deleteQuestion = require('./deleteQuestion');
+const { checkVoteCookie } = require('../../../../helpers/middlewares/cookie');
 
 router.post('/', validation(QuestionValidationSchema), postQuestion);
 
@@ -19,10 +20,10 @@ router.get('/getallquestions', getAllQuestion);
 router.get('/getQuestionById/:questionId', getQuestionById);
 
 // This route will increase upvote by one.
-router.patch('/upvote', upvoteQuestion);
+router.patch('/upvote',checkVoteCookie, upvoteQuestion);
 
 // This route will decrease upvote by one.
-router.patch('/downvote', downvoteQuestion);
+router.patch('/downvote',checkVoteCookie, downvoteQuestion);
 
 // route for updating the question status
 router.patch('/updateStatus', validation(updateQuestionStatusSchema), updateQuestionStatus);

backend/app/routes/Q&A/question/upvoteQuestion.js

@@ -2,6 +2,7 @@ const to = require('await-to-js').default;
 const question = require('../../../models/question');
 const { ErrorHandler } = require('../../../../helpers/error');
 const constants = require('../../../../constants');
+const { getVoteCookieName } = require('../../../../helpers/middlewares/cookie');
 
 module.exports = async (req, res, next) => {
   const { questionId } = req.body;
@@ -12,10 +13,11 @@ module.exports = async (req, res, next) => {
       message: 'Database Error',
       errStack: err,
     });
-
     return next(error);
   }
 
+  res.cookie(getVoteCookieName('question', questionId), true, { maxAge: 20 * 365 * 24 * 60 * 60 * 1000 });
+
   res.status(200).send({
     message: 'Question has been upvoted',
   });

backend/helpers/middlewares/cookie.js

@@ -0,0 +1,16 @@
+const getVoteCookieName = (type, id) => `${type}_voted_${id}`;
+
+const checkVoteCookie = (req, res, next) => {
+  const { questionId, answerId } = req.body;
+  const voteType = questionId ? 'question' : 'answer';
+  const voteId = questionId || answerId;
+  const voteCookieName = getVoteCookieName(voteType, voteId);
+
+  if (req.cookies[voteCookieName]) {
+    return res.status(400).json({ error: 'You have already voted' });
+  }
+
+  next();
+};
+
+module.exports = { checkVoteCookie, getVoteCookieName }

backend/package.json

@@ -28,6 +28,7 @@
     "chai-http": "^4.3.0",
     "colors": "^1.4.0",
     "config": "^3.3.3",
+    "cookie-parser": "^1.4.6",
     "cors": "^2.8.5",
     "dotenv": "^8.2.0",
     "ejs": "^3.1.6",

frontend/.env

@@ -1 +1 @@
-REACT_APP_API="https://community-website-backend.onrender.com"
+REACT_APP_API="https://community-website-backend.onrender.com"