Add electron build script

client/.gitignore

@@ -10,6 +10,7 @@
 
 # production
 /build
+/bin
 /dist
 
 # misc

client/main.js

@@ -0,0 +1,71 @@
+const electron = require("electron");
+const fs = require("fs");
+const http = require("http");
+const path = require("path");
+const url = require("url");
+
+const map = {
+  ".css": "text/css",
+  ".html": "text/html",
+  ".ico": "image/x-icon",
+  ".jpg": "image/jpeg",
+  ".js": "text/javascript",
+  ".json": "application/json",
+  ".png": "image/png",
+  ".svg": "image/svg+xml",
+};
+
+const server = http.createServer((req, res) => {
+  // extract URL path
+  let pathname = `./${
+    url.parse(
+      path.join(
+        electron.app.isPackaged ? "resources/app/dist" : "dist",
+        req.url
+      )
+    ).pathname
+  }`;
+  // based on the URL path, extract the file extension. e.g. .js, .doc, ...
+  const ext = path.parse(pathname).ext;
+
+  if (fs.existsSync(pathname)) {
+    // if is a directory search for index file matching the extension
+    if (fs.statSync(pathname).isDirectory()) pathname += "/index" + ext;
+    try {
+      const data = fs.readFileSync(pathname);
+      // if the file is found, set Content-type and send data
+      res.setHeader("Content-type", map[ext] || "text/plain");
+      res.end(data);
+    } catch (e) {
+      res.statusCode = 500;
+      res.end(`Error getting the file: ${e}.`);
+    }
+  } else {
+    // if the file is not found, return 404
+    res.statusCode = 404;
+    res.end(`File ${pathname} not found!`);
+  }
+});
+server.listen(0, () => {
+  const port = server.address().port;
+  console.log("Listening on port:", port);
+  const createWindow = () => {
+    const win = new electron.BrowserWindow({
+      autoHideMenuBar: true,
+      center: true,
+      show: false,
+    });
+    win.loadURL(`http://localhost:${port}/index.html`);
+    win.maximize();
+    win.show();
+    win.webContents.on("did-finish-load", () => {
+      win.webContents.setZoomFactor(0.9);
+    });
+  };
+  electron.app.whenReady().then(() => {
+    createWindow();
+  });
+  electron.app.on("window-all-closed", () => {
+    electron.app.quit();
+  });
+});