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Voting
Voting
Commit 7c213ebe authored by Dennis Willers's avatar Dennis Willers 🏀
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Implement - REST-Services

parent 86ddf602
Pipeline #409 passed with stages
        in 2 minutes and 42 seconds
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        Showing with 206 additions and 6 deletions
        events.js 0 → 100644
        View file @ 7c213ebe
        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
        View file @ 7c213ebe
        ...@@ -3,14 +3,14 @@ const express = require('express'); ...@@ -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() ...@@ -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}`);
        });*/ });
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