## user.rb

require 'digest/sha1'
class User < ActiveRecord::Base
  has_many :location
  has_one :default_location, :foreign_key => :user_id, :class_name => 'Location'

  # Virtual attribute for the unencrypted password
  attr_accessor :password

  validates_presence_of     :login, :email
  validates_presence_of     :password
  validates_presence_of     :password_confirmation
  validates_length_of       :password, :within => 4..40,  :if => :password_present?
  validates_confirmation_of :password,			  :if => :password_present?
  validates_length_of       :login,    :within => 3..40,  :if => :login_present?
  validates_length_of       :email,    :within => 3..100, :if => :email_present?
  validates_uniqueness_of   :login, :email, :case_sensitive => false

  validates_each :birthdate do |record, attr, value|
    record.errors.add.attr("You're not old enough.") if value > Date.new((Date.today.year - 21),(Date.today.month),(Date.today.day))
  end

  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

  acts_as_state_machine :initial => :pending
  state :passive
  state :pending, :enter => :make_activation_code
  state :active,  :enter => :do_activate
  state :suspended
  state :deleted, :enter => :do_delete

  event :register do
    transitions :from => :passive, :to => :pending, :guard => Proc.new {|u| !(u.crypted_password.blank? && u.password.blank?) }
  end

  event :activate do
    transitions :from => :pending, :to => :active
  end

  event :suspend do
    transitions :from => [:passive, :pending, :active], :to => :suspended
  end

  event :delete do
    transitions :from => [:passive, :pending, :active, :suspended], :to => :deleted
  end

  event :unsuspend do
    transitions :from => :suspended, :to => :active,  :guard => Proc.new {|u| !u.activated_at.blank? }
    transitions :from => :suspended, :to => :pending, :guard => Proc.new {|u| !u.activation_code.blank? }
    transitions :from => :suspended, :to => :passive
  end

  # Authenticates a user by their login name and unencrypted password.  Returns the user or nil.
  def self.authenticate(login, password)
    u = find_in_state :first, :active, :conditions => {: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

  def forgot_password
    @forgotten_password = true
    self.make_password_reset_code
  end

  def reset_password
    # First update the password_reset_code before setting the
    # reset_password flag to avoid duplicate email notifications.
    update_attribute(:password_reset_code, nil)
    @reset_password = true
  end

  #used in user_observer
  def recently_forgot_password?
    @forgotten_password
  end

  def recently_reset_password?
    @reset_password
  end

  def self.find_for_forget(email)
    find_in_state :first, :active, :conditions => {:email => email}
  end

  # Returns true if the user has just been activated.
  def recently_activated?
    @activated
  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_present?
      !password.blank?
    end

    def login_present?
      !login.blank?
    end

    def email_present?
      !email.blank?
    end

    def make_activation_code
      self.deleted_at = nil
      self.activation_code = Digest::SHA1.hexdigest( Time.now.to_s.split(//).sort_by {rand}.join )
    end

    def make_password_reset_code
      self.password_reset_code = Digest::SHA1.hexdigest( Time.now.to_s.split(//).sort_by {rand}.join )
    end

    def make_email_update_code
      self.email_update_code = Digest::SHA1.hexdigest( Time.now.to_s.split(//).sort_by {rand}.join )
    end

    def do_delete
      self.deleted_at = Time.now.utc
    end

    def do_activate
      @activated = true
      self.activated_at = Time.now.utc
      self.deleted_at = self.activation_code = nil
    end
end

## users_controller.rb

class UsersController < ApplicationController
  # Protect these actions behind an admin login
  # before_filter :admin_required, :only => [:suspend, :unsuspend, :destroy, :purge]
  before_filter :login_required, :only => [:suspend, :unsuspend, :destroy, :purge]
  before_filter :find_user, :only => [:show, :suspend, :unsuspend, :destroy, :purge]

  def index
    @users = User.find(:all)
  end

  # 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.register! if @user.valid?
    params[:location][:name] = "Default"
    @location = Location.new(params[:location])
    @user.default_location = @location
    if @user.errors.empty?
      #self.current_user = @user
      #redirect_back_or_default('/')
      if @user.default_location.errors.empty?
        flash[:notice] = "Thanks for signing up! Please check your email to activate your account before logging in."
        redirect_to login_path
      else
        @user.destroy
	#@user.errors.add_to_base("There was a problem creating your account because of your default location.")
	render :action => 'new'
      end
    else
      #@user.errors.add_to_base("There was a problem creating your account.")
      render :action => 'new'
    end
  end

  def activate
    self.current_user = params[:activation_code].blank? ? false : User.find_by_activation_code(params[:activation_code])
    if logged_in? && !current_user.active?
      current_user.activate!
      flash[:notice] = "Signup complete!"
    end
    redirect_back_or_default('/')
  end

  def show
  end

  def suspend
    @user.suspend!
    redirect_to users_path
  end

  def unsuspend
    @user.unsuspend!
    redirect_to users_path
  end

  def destroy
    @user.delete!
    redirect_to users_path
  end

  def purge
    @user.destroy
    redirect_to users_path
  end

protected
  def find_user
    @user = User.find(params[:id])
  end

end


## new.html.erb

<%= error_messages_for @user, @location %>
<% form_for :user, :url => users_path do |f| -%>
  <% fields_for :user do |u| %>
<p><label for="login">Login</label><br/>
<%= u.text_field :login %></p>

<p><label for="email">Email</label><br/>
<%= u.text_field :email %></p>

<p><label for="password">Password</label><br/>
<%= u.password_field :password %></p>

<p><label for="password_confirmation">Confirm Password</label><br/>
<%= u.password_field :password_confirmation %></p>

<p><label for="birthdate">Birthdate</label><br/>
<%= date_select( :user, :birthdate,  :start_year => 1900 )%></p>

  <% end %>

  <% fields_for :location do |l| %>
<p><label for="zipcode">Zipcode</label><br/>
<%= l.text_field :zipcode %></p>
  <% end %>
<p><%= submit_tag 'Sign up' %></p>
<% end -%>