リベンジ：Rails 2.3RC1で”Restful Authentication with all the bells and whistles”をやってみる

チュートリアルの実施環境

元のチュートリアルはMySQLを使っているけど、私はSQLite3を使った。

% uname -a
Linux pi 2.6.30-2-686 #1 SMP Fri Dec 4 00:53:20 UTC 2009 i686 GNU/Linux

% more /proc/version
Linux version 2.6.30-2-686 (Debian 2.6.30-8squeeze1) (dannf@debian.org) (gcc ver
sion 4.3.4 (Debian 4.3.4-6) ) #1 SMP Fri Dec 4 00:53:20 UTC 2009

% ruby -v
ruby 1.8.7 (2009-06-12 patchlevel 174) [i486-linux]

% gem1.8 --version
1.3.5

% rails -v
Rails 2.3.5

% sqlite3 --version
3.6.21

restful authenticationのインストール

まず、新しいプロジェクトを作成し、restful authenticationをインストールする。

% rails myproject
% cd myproject
% ruby script/plugin install http://svn.techno-weenie.net/projects/plugins/restful_authentication/

Pageリソースを生成する。その後、restful_authenticationプラグインで使うファイルを生成する。

% ruby script/generate scaffold Page title:string body:text
% ruby script/generate authenticated user sessions --include-activation

上記コマンドでセッション用のコントローラーとビューができているはず。その後、application_controller.rbに"include AuthenticatedSystem"が付け加えられているかをチェックする。チェックすると付け加えられていないので付け加える。

メール送信設定

次にconfig/initalizersにmail.rbを作成する。以下はチュートリアルの例。

mail.rb:

# Email settings
ActionMailer::Base.delivery_method = :smtp
ActionMailer::Base.smtp_settings = {
  :address => "mail.yourapplication.com",
  :port => 25,
  :domain => "yourapplication.com",
  :authentication => :login,
  :user_name => "mail@yourapplication.com",
  :password => "yourapplicationpassword"  
}

mail.rb（localhostのメールサーバーをポート番号25で使う場合）

# Email settings
ActionMailer::Base.delivery_method = :smtp
ActionMailer::Base.smtp_settings = {
  :address => "localhost",
  :port => 25
}

sendmailを使ってもメールを送ることができる。その場合は、以下のようになる。

mail.rb:

# Email settings
ActionMailer::Base.delivery_method = :sendmail 
ActionMailer::Base.sendmail_settings = {
  :location => "/usr/sbin/sendmail -t"
}

次に、config/environment.rbの"Rails::Initializer.run do |config|"の後ろに以下の行を追加する。そうすると、このアプリケーションは、レジストレーションやアクティベーションなどの後にユーザーにメールを送るようになる（user_observer.rbとuser_mailer.rbはrestfulauthenticationによって、app/models以下に作られている）。

config.active_record.observers = :user_observer

次に、app/models以下にあるuser_mailer.rbを開き、思うように変更する。設定例は以下のとおり。

user_mailer.rb:

class UserMailer < ActionMailer::Base
  def signup_notification(user)
    setup_email(user)
    @subject    += 'Please activate your new account'  
    @body[:url]  = "http://localhost:3000/activate/#{user.activation_code}"  
  end
  
  def activation(user)
    setup_email(user)
    @subject    += 'Your account has been activated!'
    @body[:url]  = "http://localhost:3000/"
  end
  
  def forgot_password(user)
    setup_email(user)
    @subject    += 'You have requested to change your password'
    @body[:url]  = "http://localhost:3000/reset_password/#{user.password_reset_code}" 
  end

  def reset_password(user)
    setup_email(user)
    @subject    += 'Your password has been reset.'
  end
 
  protected
    def setup_email(user)
      @recipients  = "#{user.email}"
      @from        = "mail@yourapplication.com"
      @subject     = "YourApplication - "
      @sent_on     = Time.now
      @body[:user] = user
    end
end

チュートリアルでは上のようになっているが、モデル内に直接URLを書くのは便利ではないので、定数として定義しそれを使うようにした方が良い。
そうする場合は、config/environment.rbに定数を定義するか、config/environments/development.rb（開発用設定ファイル）かconfig/environments/development.rb（公開用設定ファイル）に書く。

• 開発環境でも実行環境でも同じ定数を使う→config/environment.rb
• 開発環境のみでその定数を使う→config/environments/production.rb
• 実行環境のみでその定数を使う→config/environments/production.rb

具体的には、以下を追加する。

## For my application
RootURL = 'http://localhost:3000/'
MyMailAddress = 'mail@yourapplication.com'

そして、user_mailer.rbを以下のように変更する。

user_mailer.rb:

class UserMailer < ActionMailer::Base
  def signup_notification(user)
    setup_email(user)
    @subject    += 'Please activate your new account'  
    @body[:url]  = "#{RootURL}activate/#{user.activation_code}"  
  end
  
  def activation(user)
    setup_email(user)
    @subject    += 'Your account has been activated!'
    @body[:url]  = "#{RootURL}"
  end
  
  def forgot_password(user)
    setup_email(user)
    @subject    += 'You have requested to change your password'
    @body[:url]  = "#{RootURL}reset_password/#{user.password_reset_code}" 
  end

  def reset_password(user)
    setup_email(user)
    @subject    += 'Your password has been reset.'
  end
 
  protected
    def setup_email(user)
      @recipients  = "#{user.email}"
      @from        = "#{MyMailAddress}"
      @subject     = "YourApplication - "
      @sent_on     = Time.now
      @body[:user] = user
    end
end

そして、user_observer.rbにパスワードのリセットとパスワード忘れ機能を組み込む。

user_observer.rb:

class UserObserver < ActiveRecord::Observer
  def after_create(user)
    UserMailer.deliver_signup_notification(user)
  end

  def after_save(user) 
    UserMailer.deliver_activation(user) if user.pending?
    UserMailer.deliver_forgot_password(user) if user.recently_forgot_password?
    UserMailer.deliver_reset_password(user) if user.recently_reset_password?
  end

end

RolesとPermissionsの設定

rolesとpermissionsを設定する。

% ruby script/generate scaffold Role rolename:string
% ruby script/generate model Permission

db/migrate以下にあるXXX_create_permissions.rbを編集する。

class CreatePermissions < ActiveRecord::Migration
  def self.up
    create_table :permissions do |t|
      t.integer :role_id, :user_id, :null => false
      t.timestamps
    end
  end

  def self.down
      drop_table :permissions
  end
end

元のチュートリアルでは、XXX_create_permissions.rbファイルの中で初期データをセットしていたが、Rails 2.3.4からそれをやめるようになったらしい（情報元：ひげろぐ：Rails 2.3.4で追加されたseeds.rbについて）

db/seeds.rbを以下のように書く。

    #Make sure the role migration file was generated first    
    Role.create(:rolename => 'administrator')
    #Then, add default admin user 
    #Be sure change the password later or in this migration file
    user = User.new
    user.login = "admin"
    user.email = "info@yourapplication.com"
    user.password = "admin"
    user.password_confirmation = "admin"
    user.save(false)
    user.send(:activate!)
    role = Role.find_by_rolename('administrator')
    user = User.find_by_login('admin')
    permission = Permission.new
    permission.role = role
    permission.user = user
    permission.save(false)

controllerを編集し始める前に、db/migrate以下にあるXXX_create_users.rbにenabledとpassword_reset_code を付け加える。

class CreateUsers < ActiveRecord::Migration
  def self.up
    create_table "users", :force => true do |t|
      t.column :login,                     :string
      t.column :email,                     :string
      t.column :crypted_password,          :string, :limit => 40
      t.column :salt,                      :string, :limit => 40
      t.column :created_at,                :datetime
      t.column :updated_at,                :datetime
      t.column :remember_token,            :string
      t.column :remember_token_expires_at, :datetime
      t.column :activation_code, :string, :limit => 40
      t.column :activated_at, :datetime
      t.column :password_reset_code, :string, :limit => 40
      t.column :enabled, :boolean, :default => true      
    end
  end

  def self.down
    drop_table "users"
  end
end

次に、app/models以下のファイルをいくつか変更しなければならない。はじめに、rolesとusersの間の関係を定義する。rolesとusersは多対多の関係なので、has_many :through宣言で関係を示す。

role.rb:

class Role < ActiveRecord::Base
  has_many :permissions
  has_many :users, :through => :permissions
end

permission.rb

class Permission < ActiveRecord::Base
  belongs_to :user
  belongs_to :role
end

Userモデルの修正

続いて、以下の変更をuser.rbに行なう。

• メールアドレスの長さチェックに関する変更
• userとrolesの間の関係
• あるユーザーがある役割をもっているかどうかを調べるチェック
• パスワード忘れに関する記述
• ユーザーアクティベートに関するいくつかの変更。

require 'digest/sha1'
class User < ActiveRecord::Base
  # Virtual attribute for the unencrypted password
  attr_accessor :password  

  validates_presence_of     :login, :email
  validates_presence_of     :password,                   :if => :password_required?
  validates_presence_of     :password_confirmation,      :if => :password_required?
  validates_length_of       :password, :within => 4..40, :if => :password_required?
  validates_confirmation_of :password,                   :if => :password_required?
  validates_length_of       :login,    :within => 3..40
  validates_length_of       :email,    :within => 6..100
  validates_uniqueness_of   :login, :email, :case_sensitive => false
  validates_format_of       :email, :with => /(^([^@\s]+)@((?:[-_a-z0-9]+\.)+[a-z]{2,})$)|(^$)/i

  has_many :permissions
  has_many :roles, :through => :permissions

  before_save :encrypt_password
  before_create :make_activation_code
 
  # prevents a user from submitting a crafted form that bypasses activation
  # anything else you want your user to change should be added here.
  attr_accessible :login, :email, :password, :password_confirmation

  class ActivationCodeNotFound < StandardError; end
  class AlreadyActivated < StandardError
    attr_reader :user, :message;
    def initialize(user, message=nil)
      @message, @user = message, user
    end
  end
 
  # Finds the user with the corresponding activation code, activates their account and returns the user.
  #
  # Raises:
  #  +User::ActivationCodeNotFound+ if there is no user with the corresponding activation code
  #  +User::AlreadyActivated+ if the user with the corresponding activation code has already activated their account
  def self.find_and_activate!(activation_code)
    raise ArgumentError if activation_code.nil?
    user = find_by_activation_code(activation_code)
    raise ActivationCodeNotFound if !user
    raise AlreadyActivated.new(user) if user.active?
    user.send(:activate!)
    user
  end

  def active?
    # the presence of an activation date means they have activated
    !activated_at.nil?
  end

  # Returns true if the user has just been activated.
  def pending?
    @activated
  end

  # Authenticates a user by their login name and unencrypted password.  Returns the user or nil.
  # Updated 2/20/08
  def self.authenticate(login, password)   
    u = find :first, :conditions => ['login = ?', login] # need to get the salt
    u && u.authenticated?(password) ? u : nil 
  end

  # Encrypts some data with the salt.
  def self.encrypt(password, salt)
    Digest::SHA1.hexdigest("--#{salt}--#{password}--")
  end

  # Encrypts the password with the user salt
  def encrypt(password)
    self.class.encrypt(password, salt)
  end

  def authenticated?(password)
    crypted_password == encrypt(password)
  end

  def remember_token?
    remember_token_expires_at && Time.now.utc < remember_token_expires_at
  end

  # These create and unset the fields required for remembering users between browser closes
  def remember_me
    remember_me_for 2.weeks
  end

  def remember_me_for(time)
    remember_me_until time.from_now.utc
  end

  def remember_me_until(time)
    self.remember_token_expires_at = time
    self.remember_token            = encrypt("#{email}--#{remember_token_expires_at}")
    save(false)
  end

  def forget_me
    self.remember_token_expires_at = nil
    self.remember_token            = nil
    save(false)
  end
 
  def forgot_password
    @forgotten_password = true
    self.make_password_reset_code
  end

  def reset_password
    # First update the password_reset_code before setting the
    # reset_password flag to avoid duplicate email notifications.
    update_attribute(:password_reset_code, nil)
    @reset_password = true
  end 

  #used in user_observer
  def recently_forgot_password?
    @forgotten_password
  end

  def recently_reset_password?
    @reset_password
  end
 
  def self.find_for_forget(email)
    find :first, :conditions => ['email = ? and activated_at IS NOT NULL', email]
  end
 
  def has_role?(rolename)
    self.roles.find_by_rolename(rolename) ? true : false
  end

  protected
 
  # before filter
  def encrypt_password
    return if password.blank?
    self.salt = Digest::SHA1.hexdigest("--#{Time.now.to_s}--#{login}--") if new_record?
    self.crypted_password = encrypt(password)
  end
     
  def password_required?
    crypted_password.blank? || !password.blank?
  end
   
  def make_activation_code
    self.activation_code = Digest::SHA1.hexdigest( Time.now.to_s.split(//).sort_by {rand}.join )
  end
   
  def make_password_reset_code
    self.password_reset_code = Digest::SHA1.hexdigest( Time.now.to_s.split(//).sort_by {rand}.join )
  end
   
  private
 
  def activate!
    @activated = true
    self.update_attribute(:activated_at, Time.now.utc)
  end   
       
end

authenticated_system.rbの編集

チュートリアルでは、lib以下にあるauthenticated_system.rbの変更を勧めている。チュートリアルでは、not_logged_in_required, check_role, check_administrator_roleと permission_denied が付け加えられている。

module AuthenticatedSystem
  protected
    # Returns true or false if the user is logged in.
    # Preloads @current_user with the user model if they're logged in.
    def logged_in?
      current_user != :false
    end

    # Accesses the current user from the session.  Set it to :false if login fails
    # so that future calls do not hit the database.
    def current_user
      @current_user ||= (login_from_session || login_from_basic_auth || login_from_cookie || :false)
    end

    # Store the given user id in the session.
    def current_user=(new_user)
      session[:user_id] = (new_user.nil? || new_user.is_a?(Symbol)) ? nil : new_user.id
      @current_user = new_user || :false
    end

    # Check if the user is authorized
    #
    # Override this method in your controllers if you want to restrict access
    # to only a few actions or if you want to check if the user
    # has the correct rights.
    #
    # Example:
    #
    #  # only allow nonbobs
    #  def authorized?
    #    current_user.login != "bob"
    #  end
    def authorized?
      logged_in?
    end

    # Filter method to enforce a login requirement.
    #
    # To require logins for all actions, use this in your controllers:
    #
    #   before_filter :login_required
    #
    # To require logins for specific actions, use this in your controllers:
    #
    #   before_filter :login_required, :only => [ :edit, :update ]
    #
    # To skip this in a subclassed controller:
    #
    #   skip_before_filter :login_required
    #
    def login_required
      authorized? || access_denied
    end
   
    def not_logged_in_required
      !logged_in? || permission_denied
    end
   
    def check_role(role)
      unless logged_in? && @current_user.has_role?(role)
        if logged_in?
          permission_denied
        else
          store_referer
          access_denied
        end
      end
    end

    def check_administrator_role
      check_role('administrator')
    end   

    # Redirect as appropriate when an access request fails.
    #
    # The default action is to redirect to the login screen.
    #
    # Override this method in your controllers if you want to have special
    # behavior in case the user is not authorized
    # to access the requested action.  For example, a popup window might
    # simply close itself.
    def access_denied
      respond_to do |format|
        format.html do
          store_location
          flash[:error] = "You must be logged in to access this feature."
          redirect_to :controller => '/session', :action => 'new'
        end
        format.xml do
          request_http_basic_authentication 'Web Password'
        end
      end
    end
   
    def permission_denied     
      respond_to do |format|
        format.html do
          #Put your domain name here ex. http://www.example.com
          domain_name = RootURL
          http_referer = session[:refer_to]
          if http_referer.nil?
            store_referer
            http_referer = ( session[:refer_to] || domain_name )
          end
          flash[:error] = "You don't have permission to complete that action."
          #The [0..20] represents the 21 characters in http://localhost:3000
          #You have to set that to the number of characters in your domain name
          if http_referer[0..20] != domain_name   
            session[:refer_to] = nil
            redirect_to root_path
          else
            redirect_to_referer_or_default(root_path)   
          end
        end
        format.xml do
          headers["Status"]           = "Unauthorized"
          headers["WWW-Authenticate"] = %(Basic realm="Web Password")
          render :text => "You don't have permission to complete this action.", :status => '401 Unauthorized'
        end
      end
    end

    # Store the URI of the current request in the session.
    #
    # We can return to this location by calling #redirect_back_or_default.
    def store_location
      session[:return_to] = request.request_uri
    end

    def store_referer
      session[:refer_to] = request.env["HTTP_REFERER"]
    end

    # Redirect to the URI stored by the most recent store_location call or
    # to the passed default.
    def redirect_back_or_default(default)
      redirect_to(session[:return_to] || default)
      session[:return_to] = nil
    end

    def redirect_to_referer_or_default(default)
      redirect_to(session[:refer_to] || default)
      session[:refer_to] = nil
    end

    # Inclusion hook to make #current_user and #logged_in?
    # available as ActionView helper methods.
    def self.included(base)
      base.send :helper_method, :current_user, :logged_in?
    end

    # Called from #current_user.  First attempt to login by the user id stored in the session.
    def login_from_session
      self.current_user = User.find(session[:user_id]) if session[:user_id]
    end

    # Called from #current_user.  Now, attempt to login by basic authentication information.
    def login_from_basic_auth
      authenticate_with_http_basic do |username, password|
        self.current_user = User.authenticate(username, password)
      end
    end

    # Called from #current_user.  Finaly, attempt to login by an expiring token in the cookie.
    def login_from_cookie
      user = cookies[:auth_token] && User.find_by_remember_token(cookies[:auth_token])
      if user && user.remember_token?
        user.remember_me
        cookies[:auth_token] = { :value => user.remember_token, :expires => user.remember_token_expires_at }
        self.current_user = user
      end
    end
end

チュートリアルの作者曰く。permission_deniedメソッドは改良の余地があるとのこと。このメソッドの働きは、あるリソースへのアクセス権限がない場合、一つ前に見ていたページに戻るというもの（ただし、自ドメインでない場合は、自ドメインのトップに戻る）。以下、チュートリアルの原文。

The permission_denied method is definitly an area I feel needs improvement. Its just something I threw together so that users would be redirected properly if they tried to access a resource they didn't have permission for. Its designed to redirect back to the last page they were on, unless that page is on another site or has the same address as the resource they're trying to access. Please let me know if you have any suggested improvements for that method.

コントローラーの編集

続いてcontrollerを編集する。チュートリアルでは、restful_authenticationによって生成された多くのactionをそれら自身のコントローラーに移している。目的は、restfulの振る舞いにできる限りそうようにするため。また、将来の拡張しやすいようにしておくため。

まず、users_controller.rbを編集する。

class UsersController < ApplicationController
  layout 'application'
  before_filter :not_logged_in_required, :only => [:new, :create]    
  before_filter :login_required, :only => [:show, :edit, :update]
  before_filter :check_administrator_role, :only => [:index, :destroy, :enable]
  
  def index
      @users = User.find(:all)
  end
  
  #This show action only allows users to view their own profile
  def show
      @user = current_user
  end
    
  # render new.rhtml
  def new
    @user = User.new
  end

  def create
    cookies.delete :auth_token
    @user = User.new(params[:user])
    @user.save!
    #Uncomment to have the user logged in after creating an account - Not Recommended
    #self.current_user = @user
    flash[:notice] = "Thanks for signing up! Please check your email to activate your account before logging in."
    redirect_to login_path   
  rescue ActiveRecord::RecordInvalid
    flash[:error] = "There was a problem creating your account."
    render :action => 'new'
  end
 
  def edit
    @user = current_user
  end
 
  def update
    @user = User.find(current_user)
    if @user.update_attributes(params[:user])
      flash[:notice] = "User updated"
      redirect_to :action => 'show', :id => current_user
    else
      render :action => 'edit'
    end
  end
 
  def destroy
    @user = User.find(params[:id])
    if @user.update_attribute(:enabled, false)
      flash[:notice] = "User disabled"
    else
      flash[:error] = "There was a problem disabling this user."
    end
    redirect_to :action => 'index'
  end

  def enable
    @user = User.find(params[:id])
    if @user.update_attribute(:enabled, true)
      flash[:notice] = "User enabled"
    else
      flash[:error] = "There was a problem enabling this user."
    end
      redirect_to :action => 'index'
  end

end

次にsessions_controller.rbを編集する。
（この方法で設定すると、openid authenticationとの統合が簡単にできる）

# This controller handles the login/logout function of the site.  
class SessionsController < ApplicationController
  layout 'application'
  before_filter :login_required, :only => :destroy
  before_filter :not_logged_in_required, :only => [:new, :create]
  
  # render new.rhtml
  def new
  end

  def create
    password_authentication(params[:login], params[:password])
  end

  def destroy
    self.current_user.forget_me if logged_in?
    cookies.delete :auth_token
    reset_session
    flash[:notice] = "You have been logged out."
    redirect_to login_path   
  end
 
  protected
 
  # Updated 2/20/08
  def password_authentication(login, password)
    user = User.authenticate(login, password)
    if user == nil
      failed_login("Your username or password is incorrect.")
    elsif user.activated_at.blank?   
      failed_login("Your account is not active, please check your email for the activation code.")
    elsif user.enabled == false
      failed_login("Your account has been disabled.")
    else
      self.current_user = user
      successful_login
    end
  end
 
  private
 
  def failed_login(message)
    flash.now[:error] = message
    render :action => 'new'
  end
 
  def successful_login
    if params[:remember_me] == "1"
      self.current_user.remember_me
      cookies[:auth_token] = { :value => self.current_user.remember_token , :expires => self.current_user.remember_token_expires_at }
    end
      flash[:notice] = "Logged in successfully"
      return_to = session[:return_to]
      if return_to.nil?
        redirect_to user_path(self.current_user)
      else
          redirect_to return_to
      end
  end

end

次にさらに二つのcontrollerを生成する。

% ruby script/generate controller Passwords edit new
% ruby script/generate controller Accounts edit

passwords_controller.rbを編集する。

class PasswordsController < ApplicationController
  layout 'application'
  before_filter :not_logged_in_required, :only => [:new, :create]
  
  # Enter email address to recover password    
  def new
  end
    
  # Forgot password action
  def create    
    return unless request.post?
    if @user = User.find_for_forget(params[:email])
      @user.forgot_password
      @user.save      
      flash[:notice] = "A password reset link has been sent to your email address." 
      redirect_to login_path
    else
      flash[:notice] = "Could not find a user with that email address." 
      render :action => 'new'
    end        
  end
  
  # Action triggered by clicking on the /reset_password/:id link recieved via email
  # Makes sure the id code is included
  # Checks that the id code matches a user in the database
  # Then if everything checks out, shows the password reset fields
  def edit
    if params[:id].nil? 
      render :action => 'new'
      return
    end
    @user = User.find_by_password_reset_code(params[:id]) if params[:id]
    raise if @user.nil?
  rescue
    logger.error "Invalid Reset Code entered." 
    flash[:notice] = "Sorry - That is an invalid password reset code. Please check your code and try again. (Perhaps your email client inserted a carriage return?)" 
    #redirect_back_or_default('/')
    redirect_to new_user_path
  end
    
  # Reset password action /reset_password/:id
  # Checks once again that an id is included and makes sure that the password field isn't blank
  def update
    if params[:id].nil? 
      render :action => 'new'
      return
    end
    if params[:password].blank? 
      flash[:notice] = "Password field cannot be blank."
      render :action => 'edit', :id => params[:id]
      return
    end
    @user = User.find_by_password_reset_code(params[:id]) if params[:id]
    raise if @user.nil?
    return if @user unless params[:password]
      if (params[:password] == params[:password_confirmation])
        #Uncomment and comment lines with @user to have the user logged in after reset - not recommended
        #self.current_user = @user #for the next two lines to work
        #current_user.password_confirmation = params[:password_confirmation]
        #current_user.password = params[:password]
        #@user.reset_password
        #flash[:notice] = current_user.save ? "Password reset" : "Password not reset" 
        @user.password_confirmation = params[:password_confirmation]
        @user.password = params[:password]
        @user.reset_password        
        flash[:notice] = @user.save ? "Password reset." : "Password not reset."
      else
        flash[:notice] = "Password mismatch." 
        render :action => 'edit', :id => params[:id]
        return
      end  
      redirect_to login_path 
  rescue
    logger.error "Invalid Reset Code entered" 
    flash[:notice] = "Sorry - That is an invalid password reset code. Please check your code and try again. (Perhaps your email client inserted a carriage return?)" 
    redirect_to new_user_path
  end
    
end

accounts_controller.rbを編集。

class AccountsController < ApplicationController
  layout 'application'
  before_filter :login_required, :except => :show
  before_filter :not_logged_in_required, :only => :show

  # Activate action
  def show
    # Uncomment and change paths to have user logged in after activation - not recommended
    #self.current_user = User.find_and_activate!(params[:id])
    User.find_and_activate!(params[:id])
    flash[:notice] = "Your account has been activated! You can now login."
    redirect_to login_path
  rescue User::ArgumentError
    flash[:notice] = 'Activation code not found. Please try creating a new account.'
    redirect_to new_user_path   
  rescue User::ActivationCodeNotFound
    flash[:notice] = 'Activation code not found. Please try creating a new account.'
    redirect_to new_user_path
  rescue User::AlreadyActivated
    flash[:notice] = 'Your account has already been activated. You can log in below.'
    redirect_to login_path
  end
   
  def edit
  end
 
  # Change password action 
  def update
    return unless request.post?
    if User.authenticate(current_user.login, params[:old_password])
      if ((params[:password] == params[:password_confirmation]) && !params[:password_confirmation].blank?)
        current_user.password_confirmation = params[:password_confirmation]
        current_user.password = params[:password]       
        if current_user.save
          flash[:notice] = "Password successfully updated."
          redirect_to root_path #profile_url(current_user.login)
        else
          flash[:error] = "An error occured, your password was not changed."
          render :action => 'edit'
        end
      else
        flash[:error] = "New password does not match the password confirmation."
        @old_password = params[:old_password]
        render :action => 'edit'     
      end
    else
      flash[:error] = "Your old password is incorrect."
      render :action => 'edit'
    end   
  end
 
end

roles_controller.rbを編集。

class RolesController < ApplicationController
  layout 'application'
  before_filter :check_administrator_role

  def index
    @user = User.find(params[:user_id])
    @all_roles = Role.find(:all)
  end

  def update
    @user = User.find(params[:user_id])
    @role = Role.find(params[:id])
    unless @user.has_role?(@role.rolename)
      @user.roles << @role
    end
    redirect_to :action => 'index'
  end
 
  def destroy
    @user = User.find(params[:user_id])
    @role = Role.find(params[:id])
    if @user.has_role?(@role.rolename)
      @user.roles.delete(@role)
    end
    redirect_to :action => 'index'
  end

end

ビューの編集

次はビューの編集。まず、最初にこのアプリケーションのレイアウトを作成する。このレイアウトは少なくとも以下を含むこと。

app/view/layout/application.html.erb

<ul>
    <% if logged_in? %>
      <li>Logged in as:</li> 
      <li><%= link_to h(current_user.login.capitalize), user_path(current_user) %></li>
      <ul>
      <li><%= link_to 'Edit Profile', edit_user_path(current_user) %></li>
      <li><%= link_to 'Change Password', change_password_path %></li>
      <li><%= link_to 'Log Out', logout_url %></li>
      </ul>
      <% if current_user.has_role?('administrator') %>
        <li><%= link_to 'Administer Users', users_path %></li>
      <% end %>
    <% else %> 
      <li><%= link_to 'Log In', new_session_path %></li>
      <li><%= link_to 'Sign Up', new_user_path %></li>      
      <li><%= link_to 'Forgot Password?', forgot_password_path %></li>     
    <% end %>         
</ul>

私は以下のようにファイルを用意した。

<html>
<head>
<meta http-equiv="content-type" content="text/html;charset=UTF-8" />
<title><%= h @title -%></title>
<%= stylesheet_link_tag 'main' %>
</head>
<body>
<ul>
    <% if logged_in? %>
      <li>Logged in as:</li> 
      <li><%= link_to h(current_user.login.capitalize), user_path(current_user) %></li>
      <ul>
      <li><%= link_to 'Edit Profile', edit_user_path(current_user) %></li>
      <li><%= link_to 'Change Password', change_password_path %></li>
      <li><%= link_to 'Log Out', logout_url %></li>
      </ul>
      <% if current_user.has_role?('administrator') %>
        <li><%= link_to 'Administer Users', users_path %></li>
      <% end %>
    <% else %> 
      <li><%= link_to 'Log In', new_session_path %></li>
      <li><%= link_to 'Sign Up', new_user_path %></li>      
      <li><%= link_to 'Forgot Password?', forgot_password_path %></li>     
    <% end %>         
</ul>
<hr>
<h1><%= h @title -%></h1>
<p><%=h flash[:notice] -%></p>
<%= yield %>
</body>
</html>

app/views/passwords/edit.html.erbの編集。

<% form_tag url_for(:action => "update", :id => params[:id]) do %>
    Password:<br />
    <%= password_field_tag :password %><br />
    Confirm Password:<br />
    <%= password_field_tag :password_confirmation %><br />
    <%= submit_tag "Reset Your Password" %>
<% end %>

app/views/passwords/new.html.erbの編集。

<h2>Forgot Password</h2>
<% form_tag url_for(:action => 'create') do %>
    What is the email address used to create your account?<br />
    <%= text_field_tag :email, "", :size => 50 %><br />
    <%= submit_tag 'Reset Password' %>
<% end %>

app/views/accounts/edit.html.erbの編集。

<% form_tag url_for(:action => "update") do %>
  <p><label for="old_password" class="block">Old Password</label><br />
  <%= password_field_tag 'old_password', @old_password, :size => 45 %></p>

  <p><label for="password" class="block">New Password</label><br />
  <%= password_field_tag 'password', {}, :size => 45 %><br />
  <small>Between 4 and 40 characters</small></p>

  <p><label for="password_confirmation"  class="block">Confirm new password</label><br />
  <%= password_field_tag 'password_confirmation', {}, :size => 45 %></p>

  <%= submit_tag 'Change password' %>

<% end %>

app/views/roles/_role.html.erbの編集。

<li>
  <%= role.rolename %>
    <% if @user.has_role?(role.rolename) %>
      <%= link_to 'remove role', user_role_url(:id => role.id, :user_id => @user.id), :method => :delete %>
    <% else %>
      <%= link_to 'assign role', user_role_url(:id => role.id, :user_id => @user.id), :method => :put %>
    <% end %>
</li>

app/views/roles/index.html.erb:

<h2>Roles for <%=h @user.login.capitalize %></h2>

<h3>Roles assigned:</h3>
<ul><%= render :partial => 'role', :collection => @user.roles %></ul>

<h3>Roles available:</h3>
<ul><%= render :partial => 'role', :collection => (@all_roles - @user.roles) %></ul>

他のapp/views/rolesのビューに関しては削除しても良いし、拡張してもよい。

app/views/sessions/new.html.erbの編集。

<h2>Login with User ID and Password:</h2>
<% form_tag session_path do %>
<p><label for="login">Login</label><br/>
<%= text_field_tag 'login' %></p>

<p><label for="password">Password</label><br />
<%= password_field_tag 'password' %></p>

<p><label for="remember_me">Remember me:</label>
<%= check_box_tag 'remember_me' %></p>

<p><%= submit_tag 'Log in' %><%= link_to "Sign Up", new_user_path %></p>
<% end %>

app/views/user_mailer/activation.html.erbの編集。

<%=h @user.login %>, your account has been activated.  To visit the site, follow the link below:

  <%= @url %>

app/views/user_mailer/forgot_password.html.erbの編集

<%=h @user.login %>, to reset your password, please visit

  <%= @url %>

app/views/user_mailer/reset_password.html.erbの編集

<%=h @user.login %>, Your password has been reset

app/views/user_mailer/signup_notification.html.erbの編集。

Your account has been created.

  Username: <%=h @user.login %>

Visit this url to activate your account:

  <%= @url %>

app/views/users/_user.html.erbの編集。

<tr class="<%= cycle('odd', 'even') %>">
  <td><%=h user.login %></td>
  <td><%=h user.email %></td>
  <td><%= user.enabled ? 'yes' : 'no' %>
    <% unless user == current_user %>
      <% if user.enabled %>
        <%= link_to('disable', user_path(user.id), :method => :delete) %>
      <% else %>
        <%= link_to('enable', enable_user_path(user.id), :method => :put) %>
      <% end %>
    <% end %>
  </td>
  <td><%= link_to 'edit roles', user_roles_path(user) %>]</td>
</tr>

app/views/users/edit.html.erbの編集。

<h2>Edit Your Account</h2>
<p><%= link_to 'Show Profile', user_path(@user) %> | <%= link_to 'Change Password', change_password_path %></p>
<%= error_messages_for :user %>

<% form_for :user, :url => user_url(@user), :html => { :method => :put } do |f| %>
  <p>Email:<br /><%= f.text_field :email, :size => 60 %></p>
 
<%= submit_tag 'Save' %>
<% end %>

app/views/users/index.html.erbの編集。

<h2>All Users</h2>
<table>
  <tr>
    <th>Username</th>
    <th>Email</th>
    <th>Enabled?</th>
    <th>Roles</th>
  </tr>
    <%= render :partial => 'user', :collection => @users %>
</table>

app/views/users/new.html.erbの編集。

<%= error_messages_for :user %>
<% form_for :user, :url => users_path do |f| %>
<p><label for="login">Login</label><br/>
<%= f.text_field :login %></p>

<p><label for="email">Email</label><br/>
<%= f.text_field :email %></p>

<p><label for="password">Password</label><br/>
<%= f.password_field :password %></p>

<p><label for="password_confirmation">Confirm Password</label><br/>
<%= f.password_field :password_confirmation %></p>

<p><%= submit_tag 'Sign up' %></p>
<% end %>

app/views/users/show.html.erbの編集。

<h2>User: <%=h @user.login %></h2>
<p>Joined on: <%= @user.created_at.to_s(:long) %></p>

routes.rbの編集

最後にconfig/routes.rbを編集する。

ActionController::Routing::Routes.draw do |map|
  map.root :controller => "pages", :action => "index"
  map.signup '/signup', :controller => 'users', :action => 'new'
  map.login '/login', :controller => 'sessions', :action => 'new'
  map.logout '/logout', :controller => 'sessions', :action => 'destroy'
  map.activate '/activate/:id', :controller => 'accounts', :action => 'show'
  map.forgot_password '/forgot_password', :controller => 'passwords', :action => 'new'
  map.reset_password '/reset_password/:id', :controller => 'passwords', :action => 'edit'
  map.change_password '/change_password', :controller => 'accounts', :action => 'edit'
  
  # See how all your routes lay out with "rake routes"
  map.resources :pages

  map.resources :users, :member => { :enable => :put } do |users|
      users.resource :account
      users.resources :roles
  end
 
  map.resource :session
  map.resource :password
 
  # Install the default routes as the lowest priority.
  map.connect ':controller/:action/:id'
  map.connect ':controller/:action/:id.:format'
end

public/index.htmlを削除するのをお忘れなく。

データベースマイグレーション

サイトを立ち上げるために、データベースを作る必要があるので、マイグレーションを実行する。

% rake db:reset
% rake db:seed

fixturesを使う方は上記コマンドののちに

% rake db:fixtures:load

認証まわりがうまく追加できて、ログイン後のもろもろを追加したいときに毎回Sign upするのは面倒。そういう場合は、fixturesを使う。

% rake db:fixtures:extract

これで、データベースの中身がtest/fixtures以下に吐き出される。

認証機能の利用法

サーバーを立ち上げると、あなたはユーザ認証システムを使えます。

app/controllers/pages_controller.rbにbofore_filterを付け加えるのを忘れないこと。具体的には、:login_required, :check_administrator_roleや:not_logged_in_required。

新しい、フィルターを付け加えるのも簡単。例えば、:check_moderator_roleというフィルターを付け加えたいときには、authenticated_system.rbに以下を付け加える。もちろん、moderatorという役割をテーブルに付け加えるのを忘れずに。

def check_moderator_role
  check_role('moderator')
end

公開するときは？

いろいろと方法があるけれども、Apache + Passengerで公開するならこちらをどうぞ。

• Apache + Passenger