Done

Gemfile.lock

@@ -0,0 +1,242 @@
+GEM
+  remote: https://rubygems.org/
+  specs:
+    actioncable (5.2.5)
+      actionpack (= 5.2.5)
+      nio4r (~> 2.0)
+      websocket-driver (>= 0.6.1)
+    actionmailer (5.2.5)
+      actionpack (= 5.2.5)
+      actionview (= 5.2.5)
+      activejob (= 5.2.5)
+      mail (~> 2.5, >= 2.5.4)
+      rails-dom-testing (~> 2.0)
+    actionpack (5.2.5)
+      actionview (= 5.2.5)
+      activesupport (= 5.2.5)
+      rack (~> 2.0, >= 2.0.8)
+      rack-test (>= 0.6.3)
+      rails-dom-testing (~> 2.0)
+      rails-html-sanitizer (~> 1.0, >= 1.0.2)
+    actionview (5.2.5)
+      activesupport (= 5.2.5)
+      builder (~> 3.1)
+      erubi (~> 1.4)
+      rails-dom-testing (~> 2.0)
+      rails-html-sanitizer (~> 1.0, >= 1.0.3)
+    activejob (5.2.5)
+      activesupport (= 5.2.5)
+      globalid (>= 0.3.6)
+    activemodel (5.2.5)
+      activesupport (= 5.2.5)
+    activerecord (5.2.5)
+      activemodel (= 5.2.5)
+      activesupport (= 5.2.5)
+      arel (>= 9.0)
+    activestorage (5.2.5)
+      actionpack (= 5.2.5)
+      activerecord (= 5.2.5)
+      marcel (~> 1.0.0)
+    activesupport (5.2.5)
+      concurrent-ruby (~> 1.0, >= 1.0.2)
+      i18n (>= 0.7, < 2)
+      minitest (~> 5.1)
+      tzinfo (~> 1.1)
+    addressable (2.7.0)
+      public_suffix (>= 2.0.2, < 5.0)
+    arel (9.0.0)
+    autoprefixer-rails (10.2.4.0)
+      execjs
+    bcrypt (3.1.16)
+    bindex (0.8.1)
+    bootsnap (1.7.4)
+      msgpack (~> 1.0)
+    bootstrap-sass (3.3.7)
+      autoprefixer-rails (>= 5.2.1)
+      sass (>= 3.3.4)
+    builder (3.2.4)
+    byebug (11.1.3)
+    capybara (2.18.0)
+      addressable
+      mini_mime (>= 0.1.3)
+      nokogiri (>= 1.3.3)
+      rack (>= 1.0.0)
+      rack-test (>= 0.5.4)
+      xpath (>= 2.0, < 4.0)
+    childprocess (3.0.0)
+    coffee-rails (4.2.2)
+      coffee-script (>= 2.2.0)
+      railties (>= 4.0.0)
+    coffee-script (2.4.1)
+      coffee-script-source
+      execjs
+    coffee-script-source (1.12.2)
+    concurrent-ruby (1.1.8)
+    crass (1.0.6)
+    database_cleaner (2.0.1)
+      database_cleaner-active_record (~> 2.0.0)
+    database_cleaner-active_record (2.0.0)
+      activerecord (>= 5.a)
+      database_cleaner-core (~> 2.0.0)
+    database_cleaner-core (2.0.1)
+    diff-lcs (1.4.4)
+    erubi (1.10.0)
+    execjs (2.7.0)
+    ffi (1.15.0)
+    globalid (0.4.2)
+      activesupport (>= 4.2.0)
+    i18n (1.8.10)
+      concurrent-ruby (~> 1.0)
+    jbuilder (2.11.2)
+      activesupport (>= 5.0.0)
+    listen (3.1.5)
+      rb-fsevent (~> 0.9, >= 0.9.4)
+      rb-inotify (~> 0.9, >= 0.9.7)
+      ruby_dep (~> 1.2)
+    loofah (2.9.1)
+      crass (~> 1.0.2)
+      nokogiri (>= 1.5.9)
+    mail (2.7.1)
+      mini_mime (>= 0.1.1)
+    marcel (1.0.1)
+    method_source (1.0.0)
+    mini_mime (1.1.0)
+    mini_portile2 (2.5.0)
+    minitest (5.14.4)
+    msgpack (1.4.2)
+    nio4r (2.5.7)
+    nokogiri (1.11.3)
+      mini_portile2 (~> 2.5.0)
+      racc (~> 1.4)
+    public_suffix (4.0.6)
+    puma (3.12.6)
+    racc (1.5.2)
+    rack (2.2.3)
+    rack-test (1.1.0)
+      rack (>= 1.0, < 3)
+    rack_session_access (0.2.0)
+      builder (>= 2.0.0)
+      rack (>= 1.0.0)
+    rails (5.2.5)
+      actioncable (= 5.2.5)
+      actionmailer (= 5.2.5)
+      actionpack (= 5.2.5)
+      actionview (= 5.2.5)
+      activejob (= 5.2.5)
+      activemodel (= 5.2.5)
+      activerecord (= 5.2.5)
+      activestorage (= 5.2.5)
+      activesupport (= 5.2.5)
+      bundler (>= 1.3.0)
+      railties (= 5.2.5)
+      sprockets-rails (>= 2.0.0)
+    rails-dom-testing (2.0.3)
+      activesupport (>= 4.2.0)
+      nokogiri (>= 1.6)
+    rails-html-sanitizer (1.3.0)
+      loofah (~> 2.3)
+    railties (5.2.5)
+      actionpack (= 5.2.5)
+      activesupport (= 5.2.5)
+      method_source
+      rake (>= 0.8.7)
+      thor (>= 0.19.0, < 2.0)
+    rake (13.0.3)
+    rb-fsevent (0.10.4)
+    rb-inotify (0.10.1)
+      ffi (~> 1.0)
+    rspec-core (3.10.1)
+      rspec-support (~> 3.10.0)
+    rspec-expectations (3.10.1)
+      diff-lcs (>= 1.2.0, < 2.0)
+      rspec-support (~> 3.10.0)
+    rspec-mocks (3.10.2)
+      diff-lcs (>= 1.2.0, < 2.0)
+      rspec-support (~> 3.10.0)
+    rspec-rails (5.0.1)
+      actionpack (>= 5.2)
+      activesupport (>= 5.2)
+      railties (>= 5.2)
+      rspec-core (~> 3.10)
+      rspec-expectations (~> 3.10)
+      rspec-mocks (~> 3.10)
+      rspec-support (~> 3.10)
+    rspec-support (3.10.2)
+    ruby_dep (1.5.0)
+    rubyzip (2.3.0)
+    sass (3.7.4)
+      sass-listen (~> 4.0.0)
+    sass-listen (4.0.0)
+      rb-fsevent (~> 0.9, >= 0.9.4)
+      rb-inotify (~> 0.9, >= 0.9.7)
+    sass-rails (5.1.0)
+      railties (>= 5.2.0)
+      sass (~> 3.1)
+      sprockets (>= 2.8, < 4.0)
+      sprockets-rails (>= 2.0, < 4.0)
+      tilt (>= 1.1, < 3)
+    selenium-webdriver (3.142.7)
+      childprocess (>= 0.5, < 4.0)
+      rubyzip (>= 1.2.2)
+    spring (2.1.1)
+    spring-watcher-listen (2.0.1)
+      listen (>= 2.7, < 4.0)
+      spring (>= 1.2, < 3.0)
+    sprockets (3.7.2)
+      concurrent-ruby (~> 1.0)
+      rack (> 1, < 3)
+    sprockets-rails (3.2.2)
+      actionpack (>= 4.0)
+      activesupport (>= 4.0)
+      sprockets (>= 3.0.0)
+    sqlite3 (1.3.13)
+    thor (1.1.0)
+    thread_safe (0.3.6)
+    tilt (2.0.10)
+    turbolinks (5.2.1)
+      turbolinks-source (~> 5.2)
+    turbolinks-source (5.2.0)
+    tzinfo (1.2.9)
+      thread_safe (~> 0.1)
+    uglifier (4.2.0)
+      execjs (>= 0.3.0, < 3)
+    web-console (3.7.0)
+      actionview (>= 5.0)
+      activemodel (>= 5.0)
+      bindex (>= 0.4.0)
+      railties (>= 5.0)
+    websocket-driver (0.7.3)
+      websocket-extensions (>= 0.1.0)
+    websocket-extensions (0.1.5)
+    xpath (3.2.0)
+      nokogiri (~> 1.8)
+
+PLATFORMS
+  ruby
+
+DEPENDENCIES
+  bcrypt (~> 3.1.7)
+  bootsnap
+  bootstrap-sass (= 3.3.7)
+  byebug
+  capybara (~> 2.13)
+  coffee-rails (~> 4.2)
+  database_cleaner
+  jbuilder (~> 2.5)
+  listen (>= 3.0.5, < 3.2)
+  puma (~> 3.7)
+  rack_session_access
+  rails (~> 5.1)
+  rspec-rails
+  sass-rails (~> 5.0)
+  selenium-webdriver
+  spring
+  spring-watcher-listen (~> 2.0.0)
+  sqlite3 (~> 1.3.6)
+  turbolinks (~> 5)
+  tzinfo-data
+  uglifier (>= 1.3.0)
+  web-console (>= 3.3.0)
+
+BUNDLED WITH
+   2.1.4

app/assets/javascripts/sessions.coffee

@@ -0,0 +1,3 @@
+# Place all the behaviors and hooks related to the matching controller here.
+# All this logic will automatically be available in application.js.
+# You can use CoffeeScript in this file: http://coffeescript.org/

app/assets/stylesheets/scaffolds.scss

@@ -0,0 +1,84 @@
+body {
+  background-color: #fff;
+  color: #333;
+  margin: 33px;
+  font-family: verdana, arial, helvetica, sans-serif;
+  font-size: 13px;
+  line-height: 18px;
+}
+
+p, ol, ul, td {
+  font-family: verdana, arial, helvetica, sans-serif;
+  font-size: 13px;
+  line-height: 18px;
+}
+
+pre {
+  background-color: #eee;
+  padding: 10px;
+  font-size: 11px;
+}
+
+a {
+  color: #000;
+
+  &:visited {
+    color: #666;
+  }
+
+  &:hover {
+    color: #fff;
+    background-color: #000;
+  }
+}
+
+th {
+  padding-bottom: 5px;
+}
+
+td {
+  padding: 0 5px 7px;
+}
+
+div {
+  &.field, &.actions {
+    margin-bottom: 10px;
+  }
+}
+
+#notice {
+  color: green;
+}
+
+.field_with_errors {
+  padding: 2px;
+  background-color: red;
+  display: table;
+}
+
+#error_explanation {
+  width: 450px;
+  border: 2px solid red;
+  padding: 7px 7px 0;
+  margin-bottom: 20px;
+  background-color: #f0f0f0;
+
+  h2 {
+    text-align: left;
+    font-weight: bold;
+    padding: 5px 5px 5px 15px;
+    font-size: 12px;
+    margin: -7px -7px 0;
+    background-color: #c00;
+    color: #fff;
+  }
+
+  ul li {
+    font-size: 12px;
+    list-style: square;
+  }
+}
+
+label {
+  display: block;
+}

app/assets/stylesheets/sessions.scss

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+// Place all the styles related to the Sessions controller here.
+// They will automatically be included in application.css.
+// You can use Sass (SCSS) here: http://sass-lang.com/

app/controllers/application_controller.rb

@@ -1,3 +1,23 @@
 class ApplicationController < ActionController::Base
   protect_from_forgery with: :exception
+  helper_method :set_user, :logged_in, :current_user, :admin
+
+  def home
+  end
+
+  def set_user
+    redirect_to '/' unless logged_in
+  end
+
+  def logged_in
+    !!session[:user_id]
+  end
+
+  def current_user
+    @user ||= User.find_by(id: session[:user_id])
+  end
+
+  def admin
+    current_user.admin
+  end
 end