add standalone test for web uploading - https://github.com/emsesp/EMS-ESP32/issues/1564

mock-api/upload_server.ts

@@ -0,0 +1,57 @@
+import express from 'express';
+import multer from 'multer';
+
+const rest_server = express();
+const port = 3082;
+const upload = multer({ dest: './uploads' });
+
+const UPLOAD_FILE_ENDPOINT = '/rest/uploadFile';
+
+// delay functions, 2 different types
+const delay = (ms) => new Promise((res) => setTimeout(res, ms));
+
+function delay_blocking(milliseconds) {
+  var start = new Date().getTime();
+  // for (var i = 0; i < 1e7; i++) {
+  while (true) {
+    if (new Date().getTime() - start > milliseconds) {
+      break;
+    }
+  }
+}
+
+function progress_middleware(req, res, next) {
+  let progress = 0;
+  const file_size = req.headers['content-length'];
+  console.log('Uploading file. Size ' + file_size + ' bytes');
+
+  // set event listener
+  req.on('data', async (chunk) => {
+    progress += chunk.length;
+    const percentage = (progress / file_size) * 100;
+    console.log(`Progress: ${Math.round(percentage)}%`);
+    // await delay(1000); // slow it down
+    delay_blocking(1000); // slow it down
+  });
+  next(); // invoke next middleware which is multer
+}
+
+rest_server.post(UPLOAD_FILE_ENDPOINT, progress_middleware, upload.single('file'), (req, res) => {
+  if (req.file) {
+    const filename = req.file.originalname;
+    const ext = filename.substring(filename.lastIndexOf('.') + 1);
+    console.log(req.file);
+
+    if (ext === 'bin' || ext === 'json') {
+      console.log('Received firmware or json file, extension: ' + ext);
+      return res.sendStatus(200);
+    } else if (ext === 'md5') {
+      return res.json({ md5: 'ef4304fc4d9025a58dcf25d71c882d2c' });
+    }
+  }
+  console.log('Invalid file extension');
+  return res.sendStatus(400);
+});
+
+// start server
+rest_server.listen(port, () => console.log(`EMS-ESP File Upload mock server running on http://localhost:${port}/`));