Implement - REST-Services (7c213ebe) · Commits · Dennis Willers / Voting

events.js

0 → 100644

+200 −0

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			const express = require('express');

			function createRouter(db) {
			const router = express.Router();

			function isMapIdAndNameNotNull(req) {
			const mapId = req.body.mapId;
			const name = req.body.name;
			return mapId != null && name != null;
			}

			function isVoteRequestValid(req) {
			const userId = req.body.userId;
			const vote = req.body.vote;
			return userId != null && vote != null && isMapIdAndNameNotNull(req);
			}

			function isgetMapInfoValid(req) {
			const userId = req.body.userId;
			return userId != null && isMapIdAndNameNotNull(req);
			}

			const hasMap = function hasMap(req, res, next) {
			const mapId = req.body.mapId;
			if (isMapIdAndNameNotNull(req)) {
			const sql = 'SELECT count(*) as Maps From Map WHERE mapId = \"'+mapId+'\";';
			console.log('Map Select: ', sql);
			db.query(
			sql,
			(error, results) => {
			if (error) {
			console.log(error);
			res.header('Access-Control-Allow-Origin', "*").status(500).json({status: 'error in hasMap'});
			} else {
			numberResults = results[0].Maps;
			console.log(numberResults);
			if (numberResults === 1) next();
			else if (numberResults === 0) addMap(req, res, next);
			else res.header('Access-Control-Allow-Origin', "*").status(500).json({status: 'There are multiple maps with the same id'});
			}
			});
			} else {
			res.header('Access-Control-Allow-Origin', "*").status(500).json({status: 'JSON-Parameter are not valid'});
			}
			};

			const addMap = function addMap(req, res, next) {
			const mapId = req.body.mapId;
			const name = req.body.name;
			const sql = 'INSERT INTO Map (mapId, name) VALUES (\"'+mapId+'\", \"'+name+'\");';
			console.log('Map Insert: ', sql);
			db.query(
			sql,
			(error, results) => {
			if (error) {
			console.log(error);
			res.header('Access-Control-Allow-Origin', "*").status(500).json({status: 'error in addMap'});
			} else {
			if (results.affectedRows === 1) next();
			else res.header('Access-Control-Allow-Origin', "*").status(500).json({status: 'error in insertMap'});
			}
			});
			};

			const hasVote = function hasVote(req, res, next) {
			if (isVoteRequestValid(req)) {
			const userId = req.body.userId;
			const sql = 'SELECT userId FROM Vote WHERE userId = \"'+ userId + '\";';
			console.log('Map Insert: ', sql);
			db.query(
			sql,
			(error, results) => {
			if (error) {
			console.log(error);
			res.header('Access-Control-Allow-Origin', "*").status(500).json({status: 'error in hasVote'});
			} else {
			if (results.length === 0) insertVote(req, res, next);
			else if (results.length === 1) updateVote(req, res, next);
			else res.header('Access-Control-Allow-Origin', "*").status(500).json({status: 'too many votes by user'});
			}
			});
			} else {
			res.header('Access-Control-Allow-Origin', "*").status(500).json({status: 'Vote Request is not valid'});
			}
			};

			const insertVote = function insertVote(req, res, next) {
			if (isVoteRequestValid(req)) {
			const userId = req.body.userId;
			const mapId = req.body.mapId;
			const vote = req.body.vote;
			const sql = 'INSERT INTO Vote (userId, mapId, vote) VALUES (\"'+ userId + '\", \"'+ mapId + '\", \"' + vote +'\");';
			console.log('Insert Vote: ', sql);
			db.query(
			sql,
			(error, results) => {
			if (error) {
			console.log(error);
			res.header('Access-Control-Allow-Origin', "*").status(500).json({status: 'error in insertVote'});
			} else {
			if (results.affectedRows === 1) next();
			else res.header('Access-Control-Allow-Origin', "*").status(500).json({status: 'error in insertVote'});
			}
			});
			} else {
			res.header('Access-Control-Allow-Origin', "*").status(500).json({status: 'Vote Request is not valid'});
			}
			};

			const updateVote = function updateVote(req, res, next) {
			if (isVoteRequestValid(req)) {
			const userId = req.body.userId;
			const mapId = req.body.mapId;
			const vote = req.body.vote;
			const sql = 'UPDATE Vote SET userId = \"'+ userId + '\", mapId = \"'+ mapId + '\", vote = \"' + vote +'\" WHERE userID = \"'+ userId +'\";';
			console.log('Update Vote: ', sql);
			db.query(
			sql,
			(error, results) => {
			if (error) {
			console.log(error);
			res.header('Access-Control-Allow-Origin', "*").status(500).json({status: 'error in updateVote'});
			} else {
			if (results.affectedRows === 1) next();
			else res.header('Access-Control-Allow-Origin', "*").status(500).json({status: 'error in updateVote'});
			}
			});
			} else {
			res.header('Access-Control-Allow-Origin', "*").status(500).json({status: 'Vote Request is not valid'});
			}
			};

			const getMapInfo = function getMapInfo(req, res) {
			if (isVoteRequestValid(req)) {
			const mapId = req.body.mapId;
			const vote = req.body.vote;
			const sql = 'SELECT count(userId) as votes, round(avg(vote)) as average FROM Vote WHERE mapId LIKE \"'+ mapId + '\";';
			console.log('getMapInfo: ', sql);
			db.query(
			sql,
			(error, results) => {
			if (error) {
			console.log(error);
			res.header('Access-Control-Allow-Origin', "*").status(500).json({status: 'error in getMapInfo'});
			} else {
			if (results.length === 1) {
			const average = results[0].average;
			const votes = results[0].votes;
			if (average !== null && votes !== null) {
			res.header('Access-Control-Allow-Origin', "*").status(500).json({votes: votes, average: average, vote: vote});
			return;
			}
			}
			res.header('Access-Control-Allow-Origin', "*").status(500).json({status: 'error in getMapInfo'});
			}
			});
			} else {
			res.header('Access-Control-Allow-Origin', "*").status(500).json({status: 'Vote Request is not valid'});
			}
			};

			const getVote = function getVote(req, res) {
			if (isgetMapInfoValid(req)) {
			const mapId = req.body.mapId;
			const userId = req.body.userId;
			const sql = 'SELECT vote FROM Vote v2 WHERE mapId LIKE \"'+ mapId + '\" AND userId LIKE \"' + userId + '\";';
			console.log('Update Vote: ', sql);
			db.query(
			sql,
			(error, results) => {
			if (error) {
			console.log(error);
			res.header('Access-Control-Allow-Origin', "*").status(500).json({status: 'error in getVote'});
			} else {
			if (results.length === 1) {
			const vote = results[0].vote;
			if (vote !== null) {
			req.body.vote = vote;
			getMapInfo(req, res);
			return;
			}
			}
			res.header('Access-Control-Allow-Origin', "*").status(500).json({status: 'error in getVote'});
			}
			});
			} else {
			res.header('Access-Control-Allow-Origin', "*").status(500).json({status: 'Vote Request is not valid'});
			}
			};

			// the routes are defined here

			//Return all Sessions (Not neccesary)
			router.post('/addMap', [hasMap, hasVote, getMapInfo]);
			router.post('/getMapInfo', [getVote]);

			return router;
			}

			module.exports = createRouter;

index.js

+6 −6

Original line number	Original line	Diff line number	Diff line
	@@ -3,14 +3,14 @@ const express = require('express');
	const cors = require('cors');		const cors = require('cors');
	const bodyParser = require('body-parser');		const bodyParser = require('body-parser');
	const mysql = require('mysql');		const mysql = require('mysql');
	//const events = require('./events');		const events = require('./events');

	/*const connection = mysql.createConnection({		const connection = mysql.createConnection({
	host : '192.168.0.50',		host : '192.168.0.50',
	port : '3307',		port : '3307',
	user : '--',		user : 'votingApp',
	password : '--',		password : 'R0b0TecDev!',
	database : '--',		database : 'Voting',
	multipleStatements: true,		multipleStatements: true,
	});		});

	@@ -25,4 +25,4 @@ const app = express()

	app.listen(port, () => {		app.listen(port, () => {
	console.log(`Express server listening on port ${port}`);		console.log(`Express server listening on port ${port}`);
	});*/		});