added express endpoints, a settings service and a media info service

src/scripts/express.js

@@ -0,0 +1,36 @@
+const express = require("express");
+const { mediaInfo } = require("./mediaInfo");
+const settingsModule = require("./settings");
+const globalEvents = require("./../constants/globalEvents");
+const expressModule = {};
+var fs = require("fs");
+
+expressModule.run = function(mainWindow) {
+  function handleGlobalEvent(res, action) {
+    mainWindow.webContents.send("globalEvent", action);
+    res.sendStatus(200);
+  }
+
+  const expressApp = express();
+  expressApp.get("/", (req, res) => res.send("Hello World!"));
+  expressApp.get("/current", (req, res) => res.json(mediaInfo));
+  expressApp.get("/play", (req, res) => handleGlobalEvent(res, globalEvents.play));
+  expressApp.get("/pause", (req, res) => handleGlobalEvent(res, globalEvents.pause));
+  expressApp.get("/next", (req, res) => handleGlobalEvent(res, globalEvents.next));
+  expressApp.get("/previous", (req, res) => handleGlobalEvent(res, globalEvents.previous));
+  expressApp.get("/image", (req, res) => {
+    var stream = fs.createReadStream(mediaInfo.icon);
+    stream.on("open", function() {
+      res.set("Content-Type", "image/png");
+      stream.pipe(res);
+    });
+    stream.on("error", function() {
+      res.set("Content-Type", "text/plain");
+      res.status(404).end("Not found");
+    });
+  });
+
+  expressApp.listen(settingsModule.settings.apiSettings.port, () => {});
+};
+
+module.exports = expressModule;