1 files changed, 66 insertions, 0 deletions
diff --git a/activemodel/lib/active_model/secure_password.rb b/activemodel/lib/active_model/secure_password.rb
new file mode 100644
index 0000000000..957d0ddaaa
--- /dev/null
+++ b/activemodel/lib/active_model/secure_password.rb
@@ -0,0 +1,66 @@
+require 'bcrypt'
+
+module ActiveModel
+  module SecurePassword
+    extend ActiveSupport::Concern
+
+    module ClassMethods
+      # Adds methods to set and authenticate against a BCrypt password.
+      # This mechanism requires you to have a password_digest attribute.
+      #
+      # Validations for presence of password, confirmation of password (using
+      # a "password_confirmation" attribute) are automatically added.
+      # You can add more validations by hand if need be.
+      #
+      # Example using Active Record (which automatically includes ActiveModel::SecurePassword):
+      #
+      #   # Schema: User(name:string, password_digest:string)
+      #   class User < ActiveRecord::Base
+      #     has_secure_password
+      #   end
+      #
+      #   user = User.new(:name => "david", :password => "", :password_confirmation => "nomatch")
+      #   user.save                                                      # => false, password required
+      #   user.password = "mUc3m00RsqyRe"
+      #   user.save                                                      # => false, confirmation doesn't match
+      #   user.password_confirmation = "mUc3m00RsqyRe"
+      #   user.save                                                      # => true
+      #   user.authenticate("notright")                                  # => false
+      #   user.authenticate("mUc3m00RsqyRe")                             # => user
+      #   User.find_by_name("david").try(:authenticate, "notright")      # => nil
+      #   User.find_by_name("david").try(:authenticate, "mUc3m00RsqyRe") # => user
+      def has_secure_password
+        attr_reader   :password
+        attr_accessor :password_confirmation
+
+        validates_confirmation_of :password
+        validates_presence_of     :password_digest
+        
+        include InstanceMethodsOnActivation
+
+        if respond_to?(:attributes_protected_by_default)
+          def self.attributes_protected_by_default
+            super + ['password_digest']
+          end
+        end
+      end
+    end
+
+    module InstanceMethodsOnActivation
+      # Returns self if the password is correct, otherwise false.
+      def authenticate(unencrypted_password)
+        if BCrypt::Password.new(password_digest) == unencrypted_password
+          self
+        else
+          false
+        end
+      end
+
+      # Encrypts the password into the password_digest attribute.
+      def password=(unencrypted_password)
+        @password = unencrypted_password
+        self.password_digest = BCrypt::Password.create(unencrypted_password)
+      end
+    end
+  end
+end