Added NodeJS Server files

code/web/incoming_request_handlers.js

@@ -8,4 +8,69 @@
 // die een `app` parameter en een `pool` parameter accepteert.
 // Deze moet dan geëxporteerd worden om deze te kunnen gebruiken in `server.js`.
 // Dit is een voorbeeld van hoe je dat zou kunnen doen:
-// module.exports = function(app, pool) { ... }
+// module.exports = function(app, pool) { ... }
+
+/**
+ *
+ * @param {Request} request The incoming request
+ * @param {Response} response The response to send back
+ * @param {Express} app Express app instance
+ * @param {Pool} pool MariaDB pool instance
+ */
+function handleIncoming(request, response, app, pool)
+{
+    if (!request.hasOwnProperty('uid') || typeof request.uid !== 'number')
+    {
+        response
+            .status(400)
+            .send(JSON.stringify({error: 'Missing valid UID in request'}));
+        return;
+    }
+
+    // Acquire database connection
+    pool.getConnection()
+        .then(conn => {
+            conn.query('SELECT * FROM Exercise WHERE ExerciseID = ?', [request.uid])
+                .then(rows => {
+                    if (rows.length === 0)
+                    {
+                        response
+                            .status(404)
+                            .send(JSON.stringify({error: 'Exercise not found'}));
+                    }
+                    else
+                    {
+                        // Send back the data in the right format
+                        let firstRow = rows[0];
+                        response
+                            .status(200)
+                            .send(JSON.stringify({
+                                name: firstRow.Name,
+                                description: firstRow.Description,
+                                muscleGroup: firstRow.MuscleGroup,
+                                imageUrl: firstRow.ImageURL,
+                                videoUrl: firstRow.VideoURL
+                            }));
+                    }
+                })
+                .catch(_ => {
+                    response
+                        .status(500)
+                        .send(JSON.stringify({error: 'Internal server error'}));
+                })
+                .finally(() => {
+                    conn.end();
+                });
+        })
+        .catch(_ => {
+            response
+                .status(500)
+                .send(JSON.stringify({error: 'Internal server error'}));
+        });
+
+}
+
+// Export the function that registers the incoming request handlers
+module.exports = function(app, pool) {
+    app.get('/', (req, res) => handleIncoming(req, res, app, pool));
+};

code/web/server.js

@@ -1,7 +1,9 @@
 const mariadb = require('mariadb');
 const express = require('express');
 const app = express();
+const bodyParser = require('body-parser');
 
+app.use(bodyParser.json());
 const serverPort = 3000;
 
 const databaseCredentials = {
@@ -11,7 +13,7 @@ const databaseCredentials = {
     database: 'fitbot',
     connectionLimit: 5,
     allowUnauthorized: true
-}
+};
 
 // Create connection pool
 const pool = mariadb.createPool(databaseCredentials);
@@ -20,6 +22,6 @@ const pool = mariadb.createPool(databaseCredentials);
 require('incoming_request_handlers')(app, pool);
 
 // Start server
-app.listen(port, () => {
+app.listen(serverPort, () => {
     console.log(`Server running on port ${serverPort}`);
-})
+});