PassportJs

What we’ll be building:

We will build an application that will have:

# Local account logins and signups (using passport-local)
# Facebook logins and registration (using passport-facebook)
# Twitter logins and registration (using passport-twitter)
# Google+ logins and registration (using oauth with passport-google-oauth)
# Require login for certain routes/sections of your application
# Creating a password hash for local accounts (using bcrypt-nodejs)
# Displaying error messages (using flash with connect-flash. required since express 3.x)
# Linking all social accounts under one user account
# Allowing a user to unlink a specific social account

Application Structure

- app
------ models
---------- user.js  <!-- our user model -->
------ routes.js    <!-- all the routes for our application -->
- config
------ auth.js      <!-- will hold all our client secret keys (facebook, twitter, google) -->
------ database.js  <!-- will hold our database connection settings -->
------ passport.js  <!-- configuring the strategies for passport -->
- views
------ index.ejs    <!-- show our home page with login links -->
------ login.ejs    <!-- show our login form -->
------ signup.ejs   <!-- show our signup form -->
------ profile.ejs  <!-- after a user logs in, they will see their profile -->
- package.json      <!-- handle our npm packages -->
- server.js         <!-- setup our application -->

Module dependency

# Express - is the framework.
# Ejs - is the templating engine.
# Mongoose is object modeling for our MongoDB database.
# Passport - stuff will help us authenticating with different methods.
# Connect-flash - allows for passing session flashdata messages.
# Bcrypt-nodejs - gives us the ability to hash the password.
# Morgan - is another HTTP request logger middleware for Node.js.
# body-parser - is create a middleware and all middleware with populate the req.body property with the parsed body for json, row, text, URL-encode body parser
# cookie-parser - parse cookie header