Implement basic login

Author: khin-alu

Gemfile

@@ -4,6 +4,7 @@ git_source(:github) { |repo| "https://github.com/#{repo}.git" }
 ruby "3.4.3"
 
 gem "rails", "8.0.2"
+gem "jsbundling-rails", "1.3.1"
 gem "bcrypt", "3.1.13"
 gem "cssbundling-rails", "1.4.3"
 gem "propshaft", "1.2.1"

Gemfile.lock

@@ -147,6 +147,8 @@ GEM
     jbuilder (2.13.0)
       actionview (>= 5.0.0)
       activesupport (>= 5.0.0)
+    jsbundling-rails (1.3.1)
+      railties (>= 6.0.0)
     kamal (2.7.0)
       activesupport (>= 7.0)
       base64 (~> 0.2)
@@ -357,6 +359,7 @@ DEPENDENCIES
   guard-minitest (= 2.4.6)
   importmap-rails (= 2.1.0)
   jbuilder (= 2.13.0)
+  jsbundling-rails (= 1.3.1)
   kamal (= 2.7.0)
   minitest (= 5.25.5)
   minitest-reporters (= 1.7.1)

Procfile.dev

@@ -1,2 +1,3 @@
 web: env RUBY_DEBUG_OPEN=true bin/rails server
 css: yarn watch:css
+js: yarn build --watch

app/assets/stylesheets/application.bootstrap.scss

@@ -173,3 +173,21 @@ input {
     color: $danger;
   }
 }
+
+@media (max-width: 800px) {
+  footer {
+    small {
+      display: block;
+      float: none;
+      margin-bottom: 1em;
+    }
+    ul {
+      float: none;
+      padding: 0;
+      li {
+        float: none;
+        margin-left: 0;
+      }
+    }
+  }
+}

app/controllers/application_controller.rb

@@ -1,4 +1,5 @@
 class ApplicationController < ActionController::Base
+  include SessionsHelper
   # Only allow modern browsers supporting webp images, web push, badges, import maps, CSS nesting, and CSS :has.
   allow_browser versions: :modern
 

app/controllers/sessions_controller.rb

@@ -0,0 +1,21 @@
+class SessionsController < ApplicationController
+  def new
+  end
+
+  def create
+    user = User.find_by(email: params[:session][:email].downcase)
+    if user && user.authenticate(params[:session][:password])
+      reset_session
+      log_in user
+      redirect_to user
+    else
+      flash.now[:danger] = "Invalid email/password combination"
+      render "new", status: :unprocessable_entity
+    end
+  end
+
+  def destroy
+    log_out
+    redirect_to root_url, status: :see_other
+  end
+end

app/controllers/users_controller.rb

@@ -10,9 +10,10 @@ def new
   def create
     @user = User.new(user_params)
     if @user.save
+      reset_session
+      log_in @user
       flash[:success] = "Welcome to the Sample App!"
       redirect_to @user
-      # Handle a successful save.
     else
       render "new", status: :unprocessable_entity
     end

app/helpers/sessions_helper.rb

@@ -0,0 +1,24 @@
+module SessionsHelper
+  # Logs in the given user.
+  def log_in(user)
+    session[:user_id] = user.id
+  end
+
+  # Returns the current logged-in user (if any).
+  def current_user
+    if session[:user_id]
+      @current_user ||= User.find_by(id: session[:user_id])
+    end
+  end
+
+  # Returns true if the user is logged in, false otherwise.
+  def logged_in?
+    !current_user.nil?
+  end
+
+  # Logs out the current user.
+  def log_out
+    reset_session
+    @current_user = nil
+  end
+end

app/javascript/application.js

@@ -0,0 +1,3 @@
+// Entry point for the build script in your package.json
+import * as bootstrap from "bootstrap";
+

app/models/user.rb

@@ -7,4 +7,10 @@ class User < ApplicationRecord
                     uniqueness: { case_sensitive: false }
   has_secure_password
   validates :password, presence: true, length: { minimum: 6 }
+
+  # Returns the hash digest of the given string.
+  def User.digest(string)
+    cost = ActiveModel::SecurePassword.min_cost ? BCrypt::Engine::MIN_COST : BCrypt::Engine.cost
+    BCrypt::Password.create(string, cost: cost)
+  end
 end