modifying user model to match what is wanted in 15.9, plus trashing foray into using new-style db: tasks to do awesomeness (sigh)

cookbook/015/hodgepodge/app/models/user.rb

@@ -1,10 +1,32 @@
+require 'sha1'
+
+
 class User < ActiveRecord::Base
+  attr_accessor :password
+  attr_protected :hashed_password
   validates_uniqueness_of :username
-  validates_confirmation_of :password, :on => :create
-  validates_length_of :password, :within => 5..40
+  validates_confirmation_of :password, :if => lambda { |user|
+    user.new_record? or not user.password.blank? }
+  validates_length_of :password, :within => 5..40, :if => lambda { |user|
+    user.new_record? or not user.password.blank? }
+
+  def self.hashed(str)
+    SHA1.new(str).to_s
+  end
 
   def self.authenticate(user_info)
-    find_by_username_and_password(user_info[:username],
-                                  user_info[:password])
+    user = find_by_username(user_info[:username])
+    if user && user.hashed_password == hashed(user_info[:password])
+      return user
+    end
+  end
+
+  private
+  before_save :update_password
+
+  def update_password
+    if not password.blank?
+      self.hashed_password = self.class.hashed(password)
+    end
   end
 end