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  • Node.js authentication with passport local

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    In node.js authentication and login could be a difficult task but there are some modules available in node that makes it easier for a node developer. One of them is Passport.
    Passport is a middleware that allows us to authenticate using username and password called as local strategy. Apart from local strategy, passport has a set of strategies for authentication like facebook, twitter and so on, based on our requirement we can use any of them.
    In this particular blog i am going to use local authentication.
    First of all i am going to create an application using express generator:

    express passportAuthApp
    cd passportAuthApp
    npm install

    Now we will install passport and passport-local Node modules using the below commands:

    npm install passport
    npm install passport-local

    Once installation is done we create a login form, so create a file view/login.html:

    <html>
      <body>
        <form action="/login" method="post">
          <div>
            <label>Username:</label>
            <input type="text" name="username" />
            <br/>
          </div>
          <div>
            <label>Password:</label>
            <input type="password" name="password" />
          </div>
          <div>
            <input type="submit" value="Submit" />
          </div>
        </form>
      </body>
    </html>


    Inside app.js, add the following route:

    app.get('/', function(req, res) {
      res.render('login');
    });

    Now open the browser and type http://localhost:3000, you will see a login page.
    To handle authentication we need to include passport in our app.js:

    var passport = require('passport');
    var localStrategy = require('passport-local').Strategy;
    app.use(passport.initialize());
    app.use(passport.session());

    Now we need to add routes for login page that we have created.

    app.post('/login',
      passport.authenticate('local', {
        successRedirect: '/home',
        failureRedirect: '/'
      })
    );
    
    app.get('/home', function(req, res, next) {
      res.send('Successfull authentication');
    });
    
    


    We also needs to serialize and deserialize the user instance:

    passport.serializeUser(function(user, done) {
      done(null, user);
    });

    passport.deserializeUser(function(user, done) {
      done(null, user);
    });

    As we are going to use local database for authentication, we have to connect to Mongo:
    for that first we install mongoose with the command below:
     

    npm install mongoose

    Now add Mongoose to app.js using the following code.

    var mongoose = require('mongoose');
    
    mongoose.connect('mongodb://localhost/authDatabase');

    In order to access data in mongo, we need to have schema and model.

    var schema = mongoose.Schema;
    var userSchema = new schema({
          username: String,
          password: String
        });
    
    var User = mongoose.model('User', userSchema);

    Finally we include our logic to authenticate the user using User model.
     

    passport.use(new localStrategy(function(username, password, done) {    
        process.nextTick(function() {
        User.findOne({
          'username': username,
        }, function(err, user) {
          if (err) {
              return done(err);
          }
    
          if (!user) {
              return done(null, false);
          }
    
          if (user.password != password) {
              return done(null, false);
          }
        
          return done(null, user);
        });
      });
    }));

    Now fill the username and password and submit the login form.User will be authenticated and redirected to the corresponding page.

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