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electron.js

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+const electron = require("electron");
+const { app, BrowserWindow } = electron;
+const express = require("express");
+const body = require("body-parser");
+const fs = require("fs");
+const backend = express();
+
+let win = null;
+
+backend.use(express.static(__dirname + "/dist"));
+backend.use(body.json());
+
+backend.post("/settings", (req, res) => {
+  var config = JSON.parse(
+    fs.readFileSync(__dirname + "/dist/config.json", "utf8")
+  );
+  config.backend = req.body.backend;
+  fs.writeFile(__dirname + "/dist/config.json", JSON.stringify(config), err => {
+    if (err) throw err;
+  });
+  res.end();
+});
+
+let server = backend.listen(0, () => {
+  console.log("LISTEN")
+  app.whenReady().then(() => {
+    createWindow()
+    app.on('activate', () => {
+      if (BrowserWindow.getAllWindows().length === 0) createWindow()
+    })
+  });
+
+});
+
+app.on("window-all-closed", () => {
+  if (process.platform != "darwin") {
+    app.quit();
+  }
+});
+
+function createWindow() {
+  console.log("CREATE WINDOW")
+  const WINDOW_WIDTH = 1200;
+  const WINDOW_HEIGHT = 680;
+
+  let bounds = electron.screen.getPrimaryDisplay().bounds;
+  let x = bounds.x + (bounds.width - WINDOW_WIDTH) / 2;
+  let y = bounds.y + (bounds.height - WINDOW_HEIGHT) / 2;
+
+  win = new BrowserWindow({
+    width: WINDOW_WIDTH,
+    height: WINDOW_HEIGHT,
+    x: x,
+    y: y,
+    icon: __dirname + "/dist/static/icon_48.png"
+  });
+
+  win.setMenuBarVisibility(false);
+
+  let session = win.webContents.session;
+  /* session.clearCache(() => {
+     let url = "http://localhost:" + server.address().port;
+     console.log(url)
+     win.loadURL(url);
+   });
+ */
+
+  let url = "http://localhost:" + server.address().port;
+  console.log(url)
+  win.loadURL(url);
+
+  win.on("closed", () => {
+    win = null;
+  });
+}