user.rb

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

  #validates_presence_of     :login, :email, :first_name, :last_name
  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       :first_name,	   :within => 3..40
	validates_length_of       :last_name,	   :within => 1..40
	validates_length_of       :login,    :within => 3..40
  validates_length_of       :email,    :within => 6..120
  validates_uniqueness_of   :login, :email, :case_sensitive => false
  validates_format_of       :email, :with => /(^([^@\s]+)@((?:[-_a-z0-9]+\.)+[a-z]{2,})$)|(^$)/i

  has_many :permissions
  has_many :roles, :through => :permissions
	has_many :posts
	has_many :comments

	before_save :encrypt_password
  before_create :make_activation_code

  # 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 :first_name, :last_name, :login, :email, :password, :password_confirmation

  #------------- Activates the user in the database.
#  def activate
#    @activated = true
#    self.activated_at = Time.now.utc
#    self.activation_code = nil
#    save(false)
#  end

# Finds the user with the corresponding activation code, activates their account and returns the user.
#
# Raises:
#  +User::ActivationCodeNotFound+ if there is no user with the corresponding activation code
#  +User::AlreadyActivated+ if the user with the corresponding activation code has already activated their account
   def self.find_and_activate!(activation_code)
     raise ArgumentError if activation_code.nil?
     user = find_by_activation_code(activation_code)
     raise ActivationCodeNotFound if !user
     raise AlreadyActivated.new(user) if user.active?
     user.send(:activate!)
    user
   end

def full_name
	"#{first_name} #{last_name}"
end

  def active?
    # the existence of an activation code means they have not activated yet
    activation_code.nil?
  end

  # Returns true if the user has just been activated.
  def pending?
    @activated
  end

  # Authenticates a user by their login name and unencrypted password.  Returns the user or nil.
  def self.authenticate(login, password)
    u = find :first, :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 :first, :conditions => ['email = ? and activated_at IS NOT NULL', email]
  end

  def has_role?(rolename)
    self.roles.find_by_rolename(rolename) ? true : 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

    def make_activation_code
      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

 private

   def activate!
     @activated = true
     self.update_attribute(:activated_at, Time.now.utc)
   end

 end