Capture request details for each new session

When logged into the application I want to be able to view all my active sessions so that I can determine if my account has been compromised based on the session data, user agent, and IP address.

Issues
------
- Closes #69

README.md

@@ -1398,3 +1398,88 @@ end
 > **What's Going On Here?**
 >
 > - We force SSL in production to prevent [session hijacking](https://guides.rubyonrails.org/security.html#session-hijacking). Even though the session is encrypted we want to prevent the cookie from being exposed through an insecure network. If it were exposed, a bad actor could sign in as the victim.
+
+## Step 19: Capture Request Details for Each New Session
+
+1. Add new columns to the active_sessions table.
+
+```bash
+rails g migration add_request_columns_to_active_sessions user_agent:string ip_address:string
+rails db:migrate
+```
+
+2. Update login method to capture request details.
+
+```ruby
+# app/controllers/concerns/authentication.rb
+module Authentication
+  ...
+  def login(user)
+    reset_session
+    active_session = user.active_sessions.create!(user_agent: request.user_agent, ip_address: request.ip)
+    session[:current_active_session_id] = active_session.id
+  end
+  ...
+end
+```
+
+> **What's Going On Here?**
+>
+> - We add columns to the `active_sessions` table to store data about when and where these sessions are being created. We are able to do this by tapping into the [request object](https://api.rubyonrails.org/classes/ActionDispatch/Request.html) and returning the [ip](https://api.rubyonrails.org/classes/ActionDispatch/Request.html#method-i-ip) and user agent. The user agent is simply the browser and device.
+ 
+
+4. Update Users Controller.
+
+```ruby
+# app/controllers/users_controller.rb
+class UsersController < ApplicationController
+  ...
+  def edit
+    @user = current_user
+    @active_sessions = @user.active_sessions.order(created_at: :desc)
+  end
+  ...
+  def update
+    @user = current_user
+    @active_sessions = @user.active_sessions.order(created_at: :desc)
+    ...
+  end
+end
+```
+
+5. Create active session partial.
+
+```html+ruby
+<!-- app/views/active_sessions/_active_session.html.erb -->
+<td><%= active_session.user_agent %></td>
+<td><%= active_session.ip_address %></td>
+<td><%= active_session.created_at %></td>
+```
+
+6. Update account page.
+
+```html+ruby
+<!--  app/views/users/edit.html.erb -->
+...
+<h2>Current Logins</h2>
+<% if @active_sessions.any? %>
+  <table>
+    <thead>
+      <tr>
+        <th>User Agent</th>
+        <th>IP Address</th>
+        <th>Signed In At</th>
+      </tr>
+    </thead>
+    <tbody>
+      <%= render @active_sessions %>
+    </tbody>
+  </table>
+<% end %>
+```
+
+> **What's Going On Here?**
+>
+> - We're simply showing any `active_session` associated with the `current_user`. By rendering the `user_agent`, `ip_address`, and `created_at` values we're giving the `current_user` all the information they need to know if there's any suspicious activity happening with their account. For example, if there's an `active_session` with a unfamiliar IP address or browser, this could indicate that the user's account has been compromised.
+> - Note that we also instantiate `@active_sessions` in the `update` method. This is because the `update` method renders the `edit` method during failure cases.
+

app/controllers/concerns/authentication.rb

@@ -14,7 +14,7 @@ def authenticate_user!
 
   def login(user)
     reset_session
-    active_session = user.active_sessions.create!
+    active_session = user.active_sessions.create!(user_agent: request.user_agent, ip_address: request.ip)
     session[:current_active_session_id] = active_session.id
   end
 

app/controllers/users_controller.rb

@@ -20,6 +20,7 @@ def destroy
 
   def edit
     @user = current_user
+    @active_sessions = @user.active_sessions.order(created_at: :desc)
   end
 
   def new
@@ -28,6 +29,7 @@ def new
 
   def update
     @user = current_user
+    @active_sessions = @user.active_sessions.order(created_at: :desc)
     if @user.authenticate(params[:user][:current_password])
       if @user.update(update_user_params)
         if params[:user][:unconfirmed_email].present?

app/views/active_sessions/_active_session.html.erb

@@ -0,0 +1,3 @@
+<td><%= active_session.user_agent %></td>
+<td><%= active_session.ip_address %></td>
+<td><%= active_session.created_at %></td>

app/views/users/edit.html.erb

@@ -22,4 +22,21 @@
     <%= form.password_field :current_password, required: true %>
   </div>
   <%= form.submit "Update Account" %>
+<% end %>
+<h2>Current Logins</h2>
+<% if @active_sessions.any? %>
+  <table>
+    <thead>
+      <tr>
+        <th>User Agent</th>
+        <th>IP Address</th>
+        <th>Signed In At</th>
+      </tr>
+    </thead>
+    <tbody>
+      <tr>
+        <%= render @active_sessions %>
+      </tr>
+    </tbody>
+  </table>
 <% end %>

db/migrate/20220201102359_add_request_columns_to_active_sessions.rb

@@ -0,0 +1,6 @@
+class AddRequestColumnsToActiveSessions < ActiveRecord::Migration[6.1]
+  def change
+    add_column :active_sessions, :user_agent, :string
+    add_column :active_sessions, :ip_address, :string
+  end
+end

test/integration/user_interface_test.rb

@@ -0,0 +1,17 @@
+require "test_helper"
+
+class UserInterfaceTest < ActionDispatch::IntegrationTest
+  setup do
+    @confirmed_user = User.create!(email: "confirmed_user@example.com", password: "password", password_confirmation: "password", confirmed_at: Time.current)
+  end
+
+  test "should render active sessions on account page" do
+    login @confirmed_user
+    @confirmed_user.active_sessions.last.update!(user_agent: "Mozilla", ip_address: "123.457.789")
+
+    get account_path
+
+    assert_match "Mozilla", @response.body
+    assert_match "123.457.789", @response.body
+  end
+end

test/system/logins_test.rb

@@ -0,0 +1,18 @@
+require "application_system_test_case"
+
+class LoginsTest < ApplicationSystemTestCase
+  setup do
+    @confirmed_user = User.create!(email: "confirmed_user@example.com", password: "password", password_confirmation: "password", confirmed_at: Time.current)
+  end
+
+  test "should login and create active session if confirmed" do
+    visit login_path
+
+    fill_in "Email", with: @confirmed_user.email
+    fill_in "Password", with: @confirmed_user.password
+    click_on "Sign In"
+
+    assert_not_nil @confirmed_user.active_sessions.last.user_agent
+    assert_not_nil @confirmed_user.active_sessions.last.ip_address
+  end
+end