Devise 给项目添加权限验证系统

在我们之前的文章中我们已经介绍了一些登录和验证授权的解决方案，现在我们来介绍另外一个。最近，在ruby社区Devise越来越广泛的被采用来解决维护权限和验证。Devise源于Warden，而warden是一个基于Rack的验证权限gem，不过，使用devise实际并不需要任何关于warden的知识。 

如果你之前有一些其他类似的维护验证权限功能的gem的使用经验的话，你会发现Devise的和他们的不同之处在于，提供了从页面到model的实现。相比而言，例如Authlogic就只实现了丢与model层的实现，这时你就要自己去处理view层实现。而Devise是基于Rails 引擎开发的所以就可以同时提供controllers和view的实现。从功能角度来看，Devise提供了11个方面的在维护和验证权限过程的功能模块，这些模块都是可配置的。例如，其中Rememberable模块是使用cookie保存用户的登录信息，Recoverable是用来处理用户重置口令的。可定制的模块使用可以很容易的根据自己的业务需求配置对应的相应功能模块。 

Devise : 简单引用

引用：

gem 'devise'
rails generate devise:install
rails generate devise MODEL

我们可以用的变量：

before_filter :authenticate_member!

member_signed_in?

current_member

member_session

例如：

class HomesController < ApplicationController
  before_filter :authenticate_user!, :except => [:show, :index] 

  def index
    if !user_signed_in?
      return redirect_to '/account/sign_in'
    end
    return redirect_to "/admin/index" if current_user.admin
  end

  def show
    
  end
end

创建view模型：

rails generate devise:views users

下面开始：

1.gem

gem 'devise'

2.routes 

0> 运行 

rails generate devise MODEL

  devise_for :users,:path => 'account', 
                    :controllers => {
                      :registrations => :account,
                      :sessions => :sessions
                    }

1>db/migrate/......._devise_cretate_module

class DeviseCreateUsers < ActiveRecord::Migration
  def change
    create_table(:users) do |t|
      ## Database authenticatable
      t.string :email,              :null => false, :default => ""
      t.string :encrypted_password, :null => false, :default => ""

      ## Recoverable
      t.string   :reset_password_token
      ## Rememberable
      t.datetime :reset_password_sent_at

      ## Rememberable
      t.datetime :remember_created_at

      ## Trackable
      t.integer  :sign_in_count, :default => 0
      t.datetime :current_sign_in_at
      t.datetime :last_sign_in_at
      t.string   :current_sign_in_ip
      t.string   :last_sign_in_ip

      t.string :name, comment:"姓名"
      t.string :phone, comment:"电话"
      t.text :bio,comment:"用户介绍"
      t.boolean :receive_announcements,comment:"是否接收网店邮件信息",default: true
      t.references :shop
      t.string :avatar_image_uid

      #增加用户权限
      t.boolean :admin, default: true

      ## Confirmable
      # t.string   :confirmation_token
      # t.datetime :confirmed_at
      # t.datetime :confirmation_sent_at
      # t.string   :unconfirmed_email # Only if using reconfirmable

      ## Lockable
      # t.integer  :failed_attempts, :default => 0 # Only if lock strategy is :failed_attempts
      # t.string   :unlock_token # Only if unlock strategy is :email or :both
      # t.datetime :locked_at

      ## Token authenticatable
      t.string :authentication_token


      t.timestamps
    end

    add_index :users, :shop_id
    add_index :users, [:shop_id            , :email]        , :unique => true
    add_index :users, :reset_password_token, :unique => true
    # add_index :users, :confirmation_token,   :unique => true
    # add_index :users, :unlock_token,         :unique => true
    add_index :users, :authentication_token, :unique => true
  end
end

2>app/models/module.rb

class User < ActiveRecord::Base

  belongs_to   :shop
  has_many     :articles
  has_many     :permissions    , dependent: :destroy

  # Include default devise modules. Others available are:
  # :token_authenticatable, :confirmable,
  # :lockable, :timeoutable and :omniauthable
  devise :database_authenticatable, :registerable,
         :recoverable, :rememberable, :trackable, :validatable

  # Setup accessible (or protected) attributes for your model
  attr_accessible :id, :email, :password, :password_confirmation, :remember_me, :admin, :name, :shop_attributes, :phone ,:bio, :receive_announcements, :avatar_image_
  # attr_accessible :title, :body

  validates_presence_of :email
  validates :email, uniqueness: {scope: :shop_id}, format: {with: /\A[^@]+@([^@\.]+\.)+[^@\.]+\z/ }, if: :email_changed?
  validates_presence_of :password, if: :password_required?
  validates_confirmation_of :password, if: :password_required?

  validates_length_of :password, within: 6..20, allow_blank: true
  # before_create :ensure_authentication_token # 生成login token，只使用一次

  def is_admin?
    admin
  end

  def has_right?(resource_code)
    #暂时不需要校验首页权限，目前没有很多数据内容
    return true if self.is_admin?
    
    no_check_controller_array = ['account','users','kindeditor','photos','sessions',' ','oauth']     #不需要校验权限的控制器
    permissions = [all_resources.map(&:code) << no_check_controller_array].flatten
    resource_code.in?(permissions)
  end

  def all_resources
    Rails.cache.fetch("all_resources_for_user_#{id}") do
      all_resources = self.permissions.all.map(&:resource)
    end
  end

  def after_token_authentication # 登录后取消token
    self.authentication_token = nil
  end

  def password_required? # copy from devise
    !persisted? || !password.nil? || !password_confirmation.nil?
  end

end

3.在controller中使用 

class HomesController < ApplicationController
  before_filter :authenticate_user!, :except => [:show, :index] 

  def index
    if !user_signed_in?
      return redirect_to '/account/sign_in'
    end
    return redirect_to "/admin/index" if current_user.admin
  end

  def show
    
  end
end

4.生成 Devise view

rails generate devise:views users

5.rails s 运行试试

6. 重写 sessions 

class SessionsController < Devise::SessionsController
  # layout Proc.new { |controller|
  #   if controller.request.headers['X-PJAX']
  #     return false
  #   end


  #   case controller.action_name
  #   when 'new'
  #     return 'auth'
  #   end
  # }


  def new
    super
    # 在这里添加其他逻辑
  end


  def create
    return super
  end
end

7. 重写 registrations

class AccountController < Devise::RegistrationsController
  def new
    super
  end

   def create
    super
    # email = UserMailer.create_confirm("[e-mail]")
    # UserMailer.deliver(email)
    # UserMailer.confirm("[e-mail]").deliver
    # UserMailer.welcome_email(params[:user]).deliver
    UserMailer.send_mail(nil).deliver
   end

   def edit
    super
   end
end

8. 其他的View 其他的就要慢慢来了

其他定制 看文档：  https://github.com/plataformatec/devise