14.5 Playtime 14.3 Iteration I3: Limiting Access
Add admin links and a button to Logout
edit app/views/layouts/application.html.erb
<!DOCTYPE html>
<html>
<head>
<title>Pragprog Books Online Store</title>
<%= stylesheet_link_tag "depot" %>
<%= javascript_include_tag "depot" %>
<%= csrf_meta_tag %>
</head>
<body class="<%= controller.controller_name %>">
<div id="banner">
<%= image_tag("logo.png") %>
<%= @page_title || "Pragmatic Bookshelf" %>
</div>
<div id="columns">
<div id="side">
<% if @cart %>
<%= hidden_div_if(@cart.line_items.empty?, :id => 'cart') do %>
<%= render @cart %>
<% end %>
<% end %>
<ul>
<li><a href="http://www....">Home</a></li>
<li><a href="http://www..../faq">Questions</a></li>
<li><a href="http://www..../news">News</a></li>
<li><a href="http://www..../contact">Contact</a></li>
</ul>
<% if session[:user_id] %>
<ul>
<li><%= link_to 'Orders', orders_path %></li>
<li><%= link_to 'Products', products_path %></li>
<li><%= link_to 'Users', users_path %></li>
</ul>
<%= button_to 'Logout', logout_path, :method => :delete %>
<% end %>
</div>
<div id="main">
<%= yield %>
</div>
</div>
</body>
</html>
Log out
get /admin
Pragmatic Bookshelf
post /logout
get http://localhost:3000/
Pragmatic Bookshelf
Logged out
CoffeeScript is JavaScript done right. It provides all of JavaScript's functionality wrapped in a cleaner, more succinct syntax. In the first book on this exciting new language, CoffeeScript guru Trevor Burnham shows you how to hold onto all the power and flexibility of JavaScript while writing clearer, cleaner, and safer code.
Ruby is the fastest growing and most exciting dynamic language out there. If you need to get working programs delivered fast, you should add Ruby to your toolbox.
Rails Test Prescriptions is a comprehensive guide to testing Rails applications, covering Test-Driven Development from both a theoretical perspective (why to test) and from a practical perspective (how to test effectively). It covers the core Rails testing tools and procedures for Rails 2 and Rails 3, and introduces popular add-ons, including Cucumber, Shoulda, Machinist, Mocha, and Rcov.
Demonstrate that everybody can get to the store
get /
Pragmatic Bookshelf
CoffeeScript is JavaScript done right. It provides all of JavaScript's functionality wrapped in a cleaner, more succinct syntax. In the first book on this exciting new language, CoffeeScript guru Trevor Burnham shows you how to hold onto all the power and flexibility of JavaScript while writing clearer, cleaner, and safer code.
Ruby is the fastest growing and most exciting dynamic language out there. If you need to get working programs delivered fast, you should add Ruby to your toolbox.
Rails Test Prescriptions is a comprehensive guide to testing Rails applications, covering Test-Driven Development from both a theoretical perspective (why to test) and from a practical perspective (how to test effectively). It covers the core Rails testing tools and procedures for Rails 2 and Rails 3, and introduces popular add-ons, including Cucumber, Shoulda, Machinist, Mocha, and Rcov.
Demonstrate that login is required to see the products
get /products
get http://localhost:3000/login
Log in
get /login
post /login
get http://localhost:3000/admin
Pragmatic Bookshelf
Demonstrate logged in users can see the products
get /products
Pragmatic Bookshelf
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Show Edit Destroy |
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Show Edit Destroy |
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Show Edit Destroy |
Demonstrate logged in users can see the users
get /users
Pragmatic Bookshelf
Show that the tests fail (good!)
rake test
Loaded suite /home/rubys/.rvm/gems/ruby-1.8.7-p352/gems/rake-0.9.2.2/lib/rake/rake_test_loader
Started
..........
Finished in 0.410954 seconds.
10 tests, 31 assertions, 0 failures, 0 errors
Loaded suite /home/rubys/.rvm/gems/ruby-1.8.7-p352/gems/rake-0.9.2.2/lib/rake/rake_test_loader
Started
...............................................
Finished in 1.8517 seconds.
47 tests, 79 assertions, 0 failures, 0 errors
Loaded suite /home/rubys/.rvm/gems/ruby-1.8.7-p352/gems/rake-0.9.2.2/lib/rake/rake_test_loader
Started
...
Finished in 1.248134 seconds.
3 tests, 75 assertions, 0 failures, 0 errors
edit app/models/user.rb
require 'digest/sha2'
class User < ActiveRecord::Base
validates :name, :presence => true, :uniqueness => true
validates :password, :confirmation => true
attr_accessor :password_confirmation
attr_reader :password
validate :password_must_be_present
def User.authenticate(name, password)
if user = find_by_name(name)
if user.hashed_password == encrypt_password(password, user.salt)
user
end
end
end
def User.encrypt_password(password, salt)
Digest::SHA2.hexdigest(password + "wibble" + salt)
end
# 'password' is a virtual attribute
def password=(password)
@password = password
if password.present?
generate_salt
self.hashed_password = self.class.encrypt_password(password, salt)
end
end
private
def password_must_be_present
errors.add(:password, "Missing password") unless hashed_password.present?
end
def generate_salt
self.salt = self.object_id.to_s + rand.to_s
end
after_destroy :ensure_an_admin_remains
private
def ensure_an_admin_remains
if User.count.zero?
raise "Can't delete last user"
end
end
end
edit app/controllers/users_controller.rb
class UsersController < ApplicationController
# GET /users
# GET /users.xml
def index
@users = User.order(:name)
respond_to do |format|
format.html # index.html.erb
format.xml { render :xml => @users }
end
end
# GET /users/1
# GET /users/1.xml
def show
@user = User.find(params[:id])
respond_to do |format|
format.html # show.html.erb
format.xml { render :xml => @user }
end
end
# GET /users/new
# GET /users/new.xml
def new
@user = User.new
respond_to do |format|
format.html # new.html.erb
format.xml { render :xml => @user }
end
end
# GET /users/1/edit
def edit
@user = User.find(params[:id])
end
# POST /users
# POST /users.xml
def create
@user = User.new(params[:user])
respond_to do |format|
if @user.save
format.html { redirect_to(users_url,
:notice => "User #{@user.name} was successfully created.") }
format.xml { render :xml => @user,
:status => :created, :location => @user }
else
format.html { render :action => "new" }
format.xml { render :xml => @user.errors,
:status => :unprocessable_entity }
end
end
end
# PUT /users/1
# PUT /users/1.xml
def update
@user = User.find(params[:id])
respond_to do |format|
if @user.update_attributes(params[:user])
format.html { redirect_to(users_url,
:notice => "User #{@user.name} was successfully updated.") }
format.xml { head :ok }
else
format.html { render :action => "edit" }
format.xml { render :xml => @user.errors,
:status => :unprocessable_entity }
end
end
end
# DELETE /users/1
# DELETE /users/1.xml
def destroy
@user = User.find(params[:id])
begin
@user.destroy
flash[:notice] = "User #{@user.name} deleted"
rescue Exception => e
flash[:notice] = e.message
end
respond_to do |format|
format.html { redirect_to(users_url) }
format.xml { head :ok }
end
end
end