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$ ./script/generate migration rename_password_to_hashed_password
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Next, fill in the migration as shown in Listing 5-28.
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CHAPTER 5 ADVANCED ACTIVE RECORD: ENHANCING YOUR MODELS
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Listing 5-28. Migration to Rename password to hashed_password in db/migrate/ 007_ rename_ password_to_hashed_password.rb
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class RenamePasswordToHashedPassword < ActiveRecord::Migration def self.up rename_column :users, :password, :hashed_password end def self.down rename_column :users, :hashed_password, :password end end
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Run the migration using the rake db:migrate command as follows:
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$ rake db:migrate
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Next, update your User model so that it looks like Listing 5-29. In Listing 5-29, we ve programmed all the user authentication methods we ll need for allowing users to log in. Let s take a look at the code first, and then we ll describe in detail what we ve done.
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Listing 5-29. Current User Model, in app/models/user.rb
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require 'digest/sha1' class User < ActiveRecord::Base attr_accessor :password has_many :events, :dependent => :destroy has_many :registrations, :dependent => :destroy has_many :activities, :through => :registrations, :source => :event validates_presence_of validates_length_of validates_uniqueness_of validates_format_of validates_presence_of validates_format_of validates_presence_of validates_length_of :login :login, :within => 3..40 :login, :case_sensitive => false :login, :with => /^[\w\.-]+$/i :email :email, :with => /^[^@][\w.-]+@[\w.-]+[.][a-z]{2,4}$/i :password, :if => :password_required :password, :within => 4..40, :if => :password_required
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CHAPTER 5 ADVANCED ACTIVE RECORD: ENHANCING YOUR MODELS
validates_confirmation_of :password, before_save :encrypt_new_password def self.authenticate(login, password) user = find_by_login(login) return user if user && user.authenticated (password) end def authenticated (password) hashed_password == encrypt(password) end protected def encrypt_new_password return if password.blank self.hashed_password = encrypt(password) end def password_required hashed_password.blank || !password.blank end def encrypt(string) Digest::SHA1.hexdigest(string) end end
:if => :password_required
Whenever you re storing something sensitive, like a password, you want to encrypt it. To encrypt the password in our User model, we use a simple algorithm called a hash that will create a random-looking string from the provided input. This hashed output cannot be turned back into the original string easily, so even if someone steals your database, he will have a prohibitively difficult time discovering your users passwords. Ruby has a built-in library called Digest, which includes many hashing algorithms. Let s go through the additions to our User model: require 'digest/sha1': We start by requiring the Digest library we will use for encrypting the passwords. This loads the needed library and makes it available to work with in our class.
CHAPTER 5 ADVANCED ACTIVE RECORD: ENHANCING YOUR MODELS
attr_accessor :password: This defines an accessor attribute, password, at the top of the class body. This tells Ruby to create reader and writer methods for password. Since the password column doesn t actually exist in our table anymore, a password method won t be created automatically by Active Record. Still, we need a way to set the password before it s encrypted, so we make our own attribute to use. This will work just like any model attribute, except that it won t be persisted to the database when the model is saved. before_save :encrypt_new_password: This before_save callback tells Active Record to run the encrypt_new_password method before it saves a record. That means it will apply to all operations that trigger a save, including create and update. encrypt_new_password: This method should perform encryption only if the password attribute contains a value, since we wouldn t want it to happen unless a user is changing her password. So, if the password attribute is blank, we return from the method and the hash_password value is never set. If the password value is not blank, we have some work to do. We set the hashed_password attribute to the encrypted version of the password by laundering it through the encrypt method. encrypt: This method is fairly simple. It leverages Ruby s Digest library that we included on the first line to create an SHA1 digest of whatever we pass it. Since methods in Ruby always return the last thing evaluated, encrypt will return the encrypted string. password_required : When we re performing our validations, we want to make sure we re validating the presence, length, and confirmation of the password only if validation is required. And it s required only if this is a new record (the hashed_ password attribute is blank) or if the password accessor we created has been used to set a new password (!password.blank ). To make this easy, we ve created the password_required predicate method, which returns true if a password is required, or false if it s not. We then apply this method as an :if condition on all our password validators. self.authenticate: You can tell this is a class method because it s prefixed with self (it s defined on the class itself). That means you don t access it via an instance; you access it directly off the class, just as you would with find, new, or create (User.authenticate, not @user = User.new; @user.authenticate). The authenticate method accepts a login and an unencrypted password. It uses a dynamic finder (find_by_login) to fetch the user with a matching login. If the user was found, the user variable will contain a User object; if not, it will be nil. Knowing this, we can return the value of user if, and only if, it is not nil and the authenticated method returns true for the given password (user && user.authenticated (password)).
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