app.js

const createError = require('http-errors');
const express = require('express');
const path = require('path');
const cookieParser = require('cookie-parser');
const logger = require('morgan');
const sassMiddleware = require('node-sass-middleware');
const firebase = require('firebase');
require('firebase/auth');

// Firebase configuration
const firebaseConfig = {
  apiKey: process.env.FIREBASE_APIKEY,
  authDomain: process.env.FIREBASE_AUTHDOMAIN,
  databaseUrl: process.env.FIREBASE_DATABASEURL,
  storageBucket: process.env.FIREBASE_STORAGEBUCKET,
  messagingSenderId: process.env.FIREBASE_SENDERID,
};

// Initialized firebase
firebase.initializeApp(firebaseConfig);

const indexRouter = require('./routes/index');
const ApiUsersRouter = require('./routes/api/v1/user');
const ApiDogsRouter = require('./routes/api/v1/dog');

const app = express();

// view engine setup
app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'pug');

app.use(logger('dev'));
app.use(express.json());
app.use(express.urlencoded({ extended: false }));
app.use(cookieParser());
app.use(sassMiddleware({
  src: path.join(__dirname, 'public'),
  dest: path.join(__dirname, 'public'),
  indentedSyntax: false, // true = .sass and false = .scss
  sourceMap: true
}));
app.use(express.static(path.join(__dirname, 'public')));

app.use('/', indexRouter);

// API V1
app.use('/api/v1/user', ApiUsersRouter);
app.use('/api/v1/dog', ApiDogsRouter);

// catch 404 and forward to error handler
app.use((req, res, next) => {
  next(createError(404));
});

// error handler
app.use((err, req, res, next) => {
  const { message } = res // Destructuring ES6
  const { status } = err // Destructuring ES6

  // set locals, only providing error in development
  res.locals.message = message;
  res.locals.error = req.app.get('env') === 'development' ? err : {};

  // render the error page
  res.status(status || 500);
  res.render('error');
});

module.exports = app;