## app/views/products/edit.html.erb

<h1>Editing product</h1>

<%= error_messages_for :product %>

<% form_for(@product) do |f| %>
  <p>
    <b>Title</b><br />
    <%= f.text_field :title %>
  </p>

  <p>
    <b>Description</b><br />
    <%= f.text_area :description %>
  </p>

  <p>
    <b>Price</b><br />
    <%= f.text_field :price %>
  </p>

  <p>
    <%= f.submit "Update" %>
  </p>
<% end %>

<%= link_to 'Show', @product %> |
<%= link_to 'Back', products_path %>

## app/views/home/index.html.erb

<%= flash[:notice] %>

<h1>Listando Productos</h1>

<% for product in @products %>
  <p>
  Titulo: <%=h product.title %><br/>
  Descripcion: <%=h product.description %><br/>
  Precio: <%=h product.price %><br/>
  <%= link_to image_tag(product.photo.public_filename(:thumb)), product.photo.public_filename unless product.photo.nil? %><br/>
  </p>
<% end %>

<%= will_paginate @products %>


## app/views/products/new.html.erb

<h1>New product</h1>

<%= error_messages_for :product %>

<% form_for(:product, :url => products_path, :html => { :multipart => true }) do |f| %>

  <p>
    <b>Title</b><br />
    <%= f.text_field :title %>
  </p>

  <p>
    <b>Description</b><br />
    <%= f.text_area :description %>
  </p>

  <p>
    <b>Price</b><br />
    <%= f.text_field :price %>
    </p>

      <p>
    <b>Photo</b><br />
    <%= file_field :photo, :uploaded_data %>
  </p>

  <p>
    <%= f.submit "Create" %>
  </p>
<% end %>

<%= link_to 'Back', products_path %>


## app/views/products/show.html.erb

<p>
  <b>Title:</b>
  <%=h @product.title %>
</p>

<p>
  <b>Description:</b>
  <%=h @product.description %>
</p>

<p>
  <b>Price:</b>
  <%=h @product.price %>
</p>


<%= link_to 'Edit', edit_product_path(@product) %> |
<%= link_to 'Back', products_path %>

## app/views/products/edit.html.erb

<h1>Editing product</h1>

<%= error_messages_for :product %>

<% form_for(@product) do |f| %>
  <p>
    <b>Title</b><br />
    <%= f.text_field :title %>
  </p>

  <p>
    <b>Description</b><br />
    <%= f.text_area :description %>
  </p>

  <p>
    <b>Price</b><br />
    <%= f.text_field :price %>
  </p>

  <p>
    <%= f.submit "Update" %>
  </p>
<% end %>

<%= link_to 'Show', @product %> |
<%= link_to 'Back', products_path %>

## app/controllers/application.rb

# Filters added to this controller apply to all controllers in the application.
# Likewise, all the methods added will be available for all controllers.

class ApplicationController < ActionController::Base
  helper :all # include all helpers, all the time

  # See ActionController::RequestForgeryProtection for details
  # Uncomment the :secret if you're not using the cookie session store
  protect_from_forgery # :secret => 'bc304e5a67ce85a5c309c1249002e99b'
end

## app/controllers/home_controller.rb

class HomeController < ApplicationController

  def index
    @products = Product.paginate(:page => params[:page], :per_page => 15, :order => 'id DESC')
  end
end

## app/controllers/products_controller.rb

class ProductsController < ApplicationController
  include AuthenticatedSystem
  before_filter :login_required, :only => [:index, :show, :new, :edit, :create, :update, :destroy]

  # GET /products
  # GET /products.xml
  def index
    @products = Product.find(:all)

    respond_to do |format|
      format.html # index.html.erb
      format.xml  { render :xml => @products }
    end
  end

  # GET /products/1
  # GET /products/1.xml
  def show
    @product = Product.find(params[:id])

    respond_to do |format|
      format.html # show.html.erb
      format.xml  { render :xml => @product }
    end
  end

  # GET /products/new
  # GET /products/new.xml
  def new
    @product = Product.new

    respond_to do |format|
      format.html # new.html.erb
      format.xml  { render :xml => @product }
    end
  end

  # GET /products/1/edit
  def edit
    @product = Product.find(params[:id])
  end

  # POST /products
  # POST /products.xml
  def create
    @product = Product.new(params[:product])
    @product.photo = Photo.new(params[:photo])

    respond_to do |format|
      if @product.save
        flash[:notice] = 'Product was successfully created.'
        format.html { redirect_to(@product) }
        format.xml  { render :xml => @product, :status => :created, :location => @product }
      else
        format.html { render :action => "new" }
        format.xml  { render :xml => @product.errors, :status => :unprocessable_entity }
      end
    end
  end

  # PUT /products/1
  # PUT /products/1.xml
  def update
    @product = Product.find(params[:id])

    respond_to do |format|
      if @product.update_attributes(params[:product])
        flash[:notice] = 'Product was successfully updated.'
        format.html { redirect_to(@product) }
        format.xml  { head :ok }
      else
        format.html { render :action => "edit" }
        format.xml  { render :xml => @product.errors, :status => :unprocessable_entity }
      end
    end
  end

  # DELETE /products/1
  # DELETE /products/1.xml
  def destroy
    @product = Product.find(params[:id])
    @product.destroy

    respond_to do |format|
      format.html { redirect_to(products_url) }
      format.xml  { head :ok }
    end
  end
end

## app/controllers/sessions_controller.rb

# This controller handles the login/logout function of the site.
class SessionsController < ApplicationController
  # Be sure to include AuthenticationSystem in Application Controller instead
  include AuthenticatedSystem

  # render new.rhtml
  def new
  end

  def create
    self.current_user = User.authenticate(params[:login], params[:password])
    if logged_in?
      if params[:remember_me] == "1"
        self.current_user.remember_me
        cookies[:auth_token] = { :value => self.current_user.remember_token , :expires => self.current_user.remember_token_expires_at }
      end
      redirect_back_or_default('/products')
      #redirect_back_or_default('/')
      flash[:notice] = "Logged in successfully"
    else
      render :action => 'new'
    end
  end

  def destroy
    self.current_user.forget_me if logged_in?
    cookies.delete :auth_token
    reset_session
    flash[:notice] = "You have been logged out."
    redirect_back_or_default('/')
  end
end

## app/controllers/users_controller.rb

class UsersController < ApplicationController
  # Be sure to include AuthenticationSystem in Application Controller instead
  include AuthenticatedSystem


  # render new.rhtml
  def new
  end

  def create
    cookies.delete :auth_token
    # protects against session fixation attacks, wreaks havoc with
    # request forgery protection.
    # uncomment at your own risk
    # reset_session
    @user = User.new(params[:user])
    @user.save
    if @user.errors.empty?
      self.current_user = @user
      redirect_back_or_default('/')
      flash[:notice] = "Thanks for signing up!"
    else
      render :action => 'new'
    end
  end

end

## app/models/photo.rb

class Photo < ActiveRecord::Base
  belongs_to :product

    has_attachment :content_type => :image,
                 :storage => :file_system,
                 :max_size => 500.kilobytes,
                 :resize_to => '320x200>',
                 :thumbnails => { :thumb => '100x100>' }

  validates_as_attachment

end

## app/models/product.rb

class Product < ActiveRecord::Base
  has_one :photo
  validates_presence_of :title, :description
  validates_numericality_of :price
end

## app/models/user.rb

require 'digest/sha1'
class User < ActiveRecord::Base
  # Virtual attribute for the unencrypted password
  attr_accessor :password

  validates_presence_of     :login, :email
  validates_presence_of     :password,                   :if => :password_required?
  validates_presence_of     :password_confirmation,      :if => :password_required?
  validates_length_of       :password, :within => 4..40, :if => :password_required?
  validates_confirmation_of :password,                   :if => :password_required?
  validates_length_of       :login,    :within => 3..40
  validates_length_of       :email,    :within => 3..100
  validates_uniqueness_of   :login, :email, :case_sensitive => false
  before_save :encrypt_password

  # prevents a user from submitting a crafted form that bypasses activation
  # anything else you want your user to change should be added here.
  attr_accessible :login, :email, :password, :password_confirmation

  # Authenticates a user by their login name and unencrypted password.  Returns the user or nil.
  def self.authenticate(login, password)
    u = find_by_login(login) # need to get the salt
    u && u.authenticated?(password) ? u : nil
  end

  # Encrypts some data with the salt.
  def self.encrypt(password, salt)
    Digest::SHA1.hexdigest("--#{salt}--#{password}--")
  end

  # Encrypts the password with the user salt
  def encrypt(password)
    self.class.encrypt(password, salt)
  end

  def authenticated?(password)
    crypted_password == encrypt(password)
  end

  def remember_token?
    remember_token_expires_at && Time.now.utc < remember_token_expires_at
  end

  # These create and unset the fields required for remembering users between browser closes
  def remember_me
    remember_me_for 2.weeks
  end

  def remember_me_for(time)
    remember_me_until time.from_now.utc
  end

  def remember_me_until(time)
    self.remember_token_expires_at = time
    self.remember_token            = encrypt("#{email}--#{remember_token_expires_at}")
    save(false)
  end

  def forget_me
    self.remember_token_expires_at = nil
    self.remember_token            = nil
    save(false)
  end

  protected
    # before filter
    def encrypt_password
      return if password.blank?
      self.salt = Digest::SHA1.hexdigest("--#{Time.now.to_s}--#{login}--") if new_record?
      self.crypted_password = encrypt(password)
    end

    def password_required?
      crypted_password.blank? || !password.blank?
    end


end