class Account < ActiveRecord::Base
  validates_length_of     :username, :within => 3..64
  validates_presence_of   :username, :password_salt, :password_hash
  validates_uniqueness_of :username

  def password=(password)
    self.password_salt = MD5.hexdigest(rand.to_s)
    self.password_hash = MD5.hexdigest(password + password_salt)

    return nil
  end

  def self.authenticate(username, password)
    account = find(:first, :conditions => {:username => username})

    if account.password_hash != MD5.hexdigest(password + account.password_salt)
      account = nil
    end

    return account
  end
end