added user test, basic user methods

app/models/user.rb

@@ -0,0 +1,47 @@
+require 'digest/sha1'
+
+class User < ActiveRecord::Base
+  attr_accessor :password
+  
+  validates_length_of :name, :within => 2..20, :on => :create
+  validates_format_of :name, :with => /\A[^\s;,]+\Z/, :on => :create, :message => "cannot have whitespace, commas, or semicolons"
+  validates_uniqueness_of :name, :case_sensitive => false, :on => :create
+  validates_uniqueness_of :email, :case_sensitive => false, :on => :create, :if => lambda {|rec| !rec.email.blank?}
+  validates_confirmation_of :password
+
+  before_save :encrypt_password
+  after_save {|rec| Cache.put("user_name:#{rec.id}", rec.name)}
+
+  scope :named, lambda {|name| where(["lower(name) = ?", name])}
+
+  def self.authenticate(name, pass)
+    authenticate_hash(name, sha1(pass))
+  end
+
+  def self.authenticate_hash(name, pass)
+    where(["lower(name) = ? AND password_hash = ?", name.downcase, pass]).first != nil
+  end
+
+  def self.sha1(pass)
+    Digest::SHA1.hexdigest("#{Danbooru.config.password_salt}--#{pass}--")
+  end
+  
+  def self.find_name(user_id)
+    Cache.get("user_name:#{user_id}") do
+      select_value_sql("SELECT name FROM users WHERE id = ?", user_id) || Danbooru.config.default_guest_name
+    end
+  end
+  
+  def can_update?(object, foreign_key = :user_id)
+    is_moderator? || is_admin? || object.__send__(foreign_key) == id
+  end
+  
+  def pretty_name
+    name.tr("_", " ")
+  end
+  
+  def encrypt_password
+    self.password_hash = self.class.sha1(password) if password
+  end
+end
+