server.js

const { Client } = require("tplink-smarthome-api");
const express = require("express");
const app = express();
const multer = require("multer");
const upload = multer({ dest: "/tmp/" });
const smartHome = new Client();
const settings = require("./settings.js");

const clientList = {};
smartHome.startDiscovery().on("device-new", (device) => {
  device.getSysInfo().then((data) => (clientList[data.alias] = device));
});

function dimLights(brightness) {
  try {
    if (clientList[settings.DEVICE_NAME]._sysInfo.relay_state === 1) {
      clientList[settings.DEVICE_NAME].send({
        "smartlife.iot.dimmer": {
          set_dimmer_transition: {
            brightness: brightness,
            mode: settings.DIM_MODE,
            duration: settings.DURATION,
          },
        },
      });
    }
  } catch (e) {
    console.log(e);
  }
}

function powerOn() {
  console.log("Powering back on switch");
  clientList[settings.DEVICE_NAME].send({
    "smartlife.iot.dimmer": {
      set_switch_state: { state: 1 },
    },
  });
}

function hasErrors(data) {
  try {
    const isCorrectPlayer =
      (settings.PLAYER_UUID.length > 0 && data.Player.uuid == settings.PLAYER_UUID) ||
      settings.PLAYER_UUID.length == 0;

    if (!clientList[settings.DEVICE_NAME]) {
      console.log(`${settings.DEVICE_NAME} not found!`);
      return true;
    }

    if (!isCorrectPlayer || !data.Player.local) return true;

    if (clientList[settings.DEVICE_NAME]._sysInfo.relay_state === 0 && brightness !== 0) powerOn();

    return false;
  } catch (e) {
    console.log(e);
    return true;
  }
}

function handleRequest(req) {
  try {
    const data = JSON.parse(req.body?.payload);

    if (!hasErrors(data)) {
      const event = {
        "media.play": { dim: settings.DIM, alias: "Played" },
        "media.resume": { dim: settings.DIM, alias: "Resumed" },
        "media.pause": { dim: settings.BRIGHTEN, alias: "Paused" },
        "media.stop": { dim: settings.BRIGHTEN, alias: "Stopped" },
      };

      dimLights(event[data.event].dim);

      console.log(
        `Media ${event[data.event].alias}\nMedia Title: ${data.Metadata.title}\nPlayer UUID: ${
          data.Player.uuid
        }\nSettings lights to ${event[data.event].dim}%\n`
      );
    }
  } catch (e) {
    console.log(e);
  }
}

app.post("/plex", upload.single("thumb"), (req, res) => {
  handleRequest(req);
  res.sendStatus(200);
});

app.listen(44010, () => console.log("Listening for Plex events"));