Add file upload functionality

backend/src/index.ts

@@ -1,6 +1,8 @@
 import cors from 'cors';
 import dotenv from 'dotenv';
 import express from 'express';
+import formidable from 'formidable';
+import { mkdir, rename } from 'fs/promises';
 const app = express();
 
 dotenv.config();
@@ -15,8 +17,33 @@ app.listen(+process.env.API_PORT, () => console.log(`Server running on: ${proces
 app.use(express.json());
 app.use(cors({ origin: process.env.CORS_HOST }));
 
-// Register post route
-// app.post('/api/register', () => { });
+// File upload post route
+app.post('/api/upload', (req, res) => {
+  const form = new formidable.IncomingForm();
+  form.parse(req, (err, fields, files) => {
+    if (!('filepath' in files.filetoupload) || !files.filetoupload?.filepath) {
+      res.write('Ups! Missing property "filetoupload" file');
+      res.end();
+      return;
+    }
+    const filename =  files.filetoupload.originalFilename
+    const oldpath = files.filetoupload.filepath
+    const newdir = process.cwd() + '/upload/'
+    const newpath = newdir + filename
+    mkdir(newdir, { recursive: true })
+      .then(() => {
+        return rename(oldpath, newpath)
+      })
+      .then(() => {
+        console.log('New Upload: ' + filename)
+        res.write('File uploaded and moved!');
+        res.end();
+      })
+      .catch((err) => {
+        if (err) throw err;
+      })
+  });
+});
 
 
 // - - - - -
@@ -49,6 +76,6 @@ io.on("connection", (socket) => {
     console.log("Got test:", payload)
     // ...
   });
-  
+
   socket.emit('test2', 'lol')
 });