init commit

app.js

@@ -1,36 +1,47 @@
-require('dotenv').config();
-
-var createError = require('http-errors');
-var express = require('express');
-var path = require('path');
-var cookieParser = require('cookie-parser');
-var logger = require('morgan');
-
-var indexRouter = require('./routes/index');
-
-var app = express();
-
-app.locals.pluralize = require('pluralize');
+require('dotenv').config(); //Loads environment variables from an env file. 
+var createError = require('http-errors');  //Module which helps create http error objects 
+var express = require('express'); //core express framework. used to create web servers and handling http requests. 
+var path = require('path'); //provides utilities for working with file and directory paths 
+var cookieParser = require('cookie-parser'); //middleware which parses cookies attached to incoming http requests, making them accessible to the app 
+var logger = require('morgan'); //middleware which logs http requests to the console, used for debugging
+var passport = require('passport') //authentication middleware 
+var session = require('express-session') //adds session support to app, allowing you to store user data across multiple requests. 
+
+var SQLiteStore = require('connect-sqlite3')(session); //configures the session middleware to use SQLite to store session data in a file 
+var indexRouter = require('./routes/index'); //imports route definitions for the main part of the app
+var authRouter = require("./routes/auth") //imports route definitions for auth related functionality 
+var app = express(); //creates instance of the express app 
+
+app.locals.pluralize = require('pluralize'); //adds pluralize library for ejs 
 
 // view engine setup
-app.set('views', path.join(__dirname, 'views'));
-app.set('view engine', 'ejs');
-
-app.use(logger('dev'));
-app.use(express.json());
-app.use(express.urlencoded({ extended: false }));
-app.use(cookieParser());
-app.use(express.static(path.join(__dirname, 'public')));
-
-app.use('/', indexRouter);
+app.set('views', path.join(__dirname, 'views')); //looks for template ejs files in the views directory 
+app.set('view engine', 'ejs'); //sets ejs as the templating engine for the app 
+
+app.use(logger('dev')); //enables morgan logger in development mode 
+app.use(express.json()); //parses incoming JSON data from requests 
+app.use(express.urlencoded({ extended: false })); //parses incoming url encoded data from forms 
+app.use(cookieParser());  //enables cookie parsing 
+app.use(express.static(path.join(__dirname, 'public')));  //Serves static files (images, css, js) from public directory 
+app.use(session({ ////configures session handling using SQLite for storage 
+  secret: 'keyboard cat',
+  resave: false,
+  saveUninitialized: false,
+  store: new SQLiteStore({ db: 'sessions.db', dir: './var/db' })
+}))
+app.use(passport.authenticate('session')) //initializes passport and uses sessions for authentication 
+
+
+app.use('/', indexRouter);  //mounts indexRouter to handle requests to the rootpath 
+app.use('/', authRouter); //mounts authRouter to handle authentication related requests. 
 
 // catch 404 and forward to error handler
-app.use(function(req, res, next) {
+app.use(function (req, res, next) {
   next(createError(404));
 });
 
 // error handler
-app.use(function(err, req, res, next) {
+app.use(function (err, req, res, next) {
   // set locals, only providing error in development
   res.locals.message = err.message;
   res.locals.error = req.app.get('env') === 'development' ? err : {};
@@ -40,4 +51,4 @@ app.use(function(err, req, res, next) {
   res.render('error');
 });
 
-module.exports = app;
+module.exports = app;