vizwall_screensaver/server.js

const express = require('express');
const http = require('http');
const fs = require('fs');
const fetch = require('isomorphic-fetch');
const path = require('path');
require('dotenv').config();


const msGraphHelper = require('./msGraphHelper');
const settings = require('./settings');

const HTTP_PORT = process.env.HTTP_PORT || 8080;

const app = express();
const slideshowDir = './slideshow';

app.use(express.static(path.join(__dirname, 'public')));

app.use(express.json());
app.use(express.static('public'));

msGraphHelper.initializeGraphForAppOnlyAuth(settings);
const data = fs.readFileSync('./resourceUPNs.json', 'utf8');
const resourceUPNs = JSON.parse(data);

app.get('/api/events', async (req, res) => {

  try {
    let now = new Date();
    let startDateTime = new Date(now);
    // startDateTime.setHours(8, 0, 0, 0);
    let endDateTime = new Date(now);
    endDateTime.setHours(20, 0, 0, 0);

    if (startDateTime > endDateTime) {
      // Exit early since there are no relevant events to display
      return res.json({});
    }

    let events = {};
    for (const resource of resourceUPNs) {
      try {
        const data =
          await msGraphHelper.getCalendarView(resource, startDateTime.toISOString(), endDateTime.toISOString());
        const resourceEvents = data;
        events[resource] = resourceEvents;
      } catch (error) {
        console.error(error);
      }
    }
    res.json(events);
  } catch (err) {
    res.status(500).json({ message: err.message });
  }

});

app.get('/api/weather', async (req, res) => {
  try {
    const lat = 45.49;
    const lon = -73.58;
    const appId = process.env.OPENWEATHER_APPID;
    const url = `https://api.openweathermap.org/data/2.5/weather?units=metric&lat=${lat}&lon=${lon}&appid=${appId}`;

    const response = await fetch(url);

    if (response.ok) {
      const json = await response.json();
      res.json(json);
    } else {
      res.status(500).json({ message: 'Error in /weather' });
    }
  } catch (err) {
    res.status(500).json({ message: err.message });
  }
});

app.get('/api/quotes', async (req, res) => {
  try {
    const url = `https://api.quotable.io/quotes?limit=150&tags=urban|city|technology|future`
    const response = await fetch(url);

    if (response.ok) {
      const json = await response.json();
      res.json(json);
    } else {
      res.status(500).json({ message: 'Error in /quotes' });
    }
  } catch (err) {
    res.status(500).json({ message: err.message });
  }
});

app.use('/slideshow', express.static(slideshowDir));
app.get('/api/slideshow', (req, res) => {
  fs.readdir(slideshowDir, (err, files) => {
    if (err) {
      console.error('Failed to list slideshow images: ', err.message);
      res.status(500).json({ message: err.message });
      return;
    } else {
      const imagePaths = files
        .filter(file => /\.(jpg|jpeg|png|gif)$/i.test(file))
        .map(file => `/slideshow/${file}`);

      res.json(imagePaths);
    }
  });
});


const httpServer = http.createServer(app);

httpServer.listen(HTTP_PORT, () => console.log(`HTTP Server listening on http://localhost:${HTTP_PORT}`));