#Arpa
Arpa is an authorization library for Ruby or Ruby on Rails which restricts the accesses in controller and actions. Arpa will help you to customize all permissions you need dynamically.
Add this line to your application's Gemfile:
gem 'arpa'And then execute:
$ bundle
Or install it yourself as:
$ gem install arpa
After you install Arpa and add it to your Gemfile, you need to run the generator:
$ rails generate arpa:install
This command will create some files that are needed to run the Gem.
| File | Purpose |
|---|---|
| db/migrate/20140120201010_create_arpa_tables.rb | Migration to create the all Arpa tables in your database (your name will include a different timestamp) |
| config/locales/arpa.en.yml | Locales to use in Arpa classes |
Obs.: The migration file will create a associate table between Arpa::Profile and SomeModel. By default the model is User as users table. The model to associate must exist in your Application before run that generate.
If you want a different Model to associate with Arpa::Profile you can pass some arguments:
$ rails generate arpa:install [ASSOCIATE_TABLE] [ASSOCIATE_PRIMARY_KEY]
####Eg. 1:
$ rails generate arpa:install admins
That command will create the association with admins table with admin_id as foreign key.
####Eg. 2:
$ rails generate arpa:install admins admin_custom_id
That command will create the association with admins table with admin_custom_id as foreign key.
After run the generate command, you need to run the migration to create all Arpa tables:
$ rake db:migrate
Arpa can generate the Controllers, Views, Stylesheet and Routes to a basic CRUD for resources, roles and profiles. To do that you can run:
$ rails generate arpa:controllers
This command will create some files.
| File | Purpose |
|---|---|
| app/assets/stylesheets/arpa/arpa_accordion.scss | Basic stylesheet to use with Arpa views |
| app/controllers/arpa/resources_controller.rb app/controllers/arpa/roles_controller.rb app/controllers/arpa/profiles_controller.rb | Controllers to use the CRUD actions for each one |
| app/views/arpa/resources/ app/controllers/arpa/roles/ app/controllers/arpa/profiles/ | All views to use the CRUD actions for each controller above |
| config/routes.rb | Will add all routes into this file with all resources of Arpa |
First of all you must create the Resources, Roles and Profiles (each is avaliable in the paths listed in a section bellow). After that you need associate Arpa::Profile with SomeModel (to do this, you need create by your own the associate form view, saving some profiles in some model). Done that you can use some Helpers generated by Arpa.
You just need have a method called :profile_ids inside the SomeModel model. This method should return a list of ids from profiles associated in the model.
You just add a HBTM association in SomeModel model:
class User < ActiveRecord::Base
has_and_belongs_to_many :profiles, class_name: 'Arpa::Repositories::Profiles::RepositoryProfile'
endWith this you will be able to use the :profile_ids method.
If the Model name is different on database you need add the foreign_key option:
class User < ActiveRecord::Base
self.table_name = 'admins'
has_and_belongs_to_many :profiles, class_name: 'Arpa::Repositories::Profiles::RepositoryProfile', foreign_key: 'admin_id'
endArpa will create some helpers to use inside your controllers and views.
To verify if a user has access to some :controler and :action, use the following helper:
has_access?('users', 'index')Obs.: To that helper method works. You must have :current_user attribute or method.
If you want use that methods inside another object you should use the Arpa::Services::Verifier class;
You just need pass as arguments the :session and :current_user:
verifier = Arpa::Services::Verifier.new(current_user)
verifier.has_access?('users', 'index')If you want create a filter to verify if the current_user has access and if not redirect to another route you can do this:
Create a method in ApplicationController and add as a before_filter callback from rails:
class ApplicationController < ActionController::Base
before_filter :authorize_user
def authorize_user
controller = params[:controller]
action = params[:action]
redirect_to some_url unless has_access?(controller, action)
end
end Obs. 1: The has_access? method come from Controller Helper method which Arpa gem has been created.
Obs. 2: When you create the before_filter you probably wanna skip that callback in somes controllers (like login or devise controllers). To do this you need set the skip_before_action passing as parameter the name of before_filter method as you can see bellow:
skip_before_action :authorize_userArpa will use on description method from Arpa::Entities::Action a specific Locale.
You should create a locale file to print correctly the descriptions of the actions.
####Eg.:
en:
entities:
resources:
users: #Here is the name of controller
actions:
description:
#Here is each action of the controller
index: 'List of Users'
show: 'Show of User'
new: 'Access to registration form of User'
edit: 'Access to change form of User'
create: 'Perform action registering of User'
update: 'Perform action update of User'
destroy: 'Perform action destroy of User'Arpa will add a new column called is_arpa_admin as boolean in the associate table with value false as default. You must set some user (creating a migration for example), with is_arpa_admin as true to navigate between the views without be catched by the filter verification.
If you want a action of some Controller pass without permission on before_filter callback. You just need start the name of action with underscode ('_'). For example:
def _some_free_action_which_not_need_permission
endThe routes created by arpa:controllers generator will be able to access some paths for each Controller created:
generate_resources_and_actions_resources GET /resources/generate_resources_and_actions(.:format) arpa/resources#generate_resources_and_actions
resources GET /resources(.:format) arpa/resources#index
POST /resources(.:format) arpa/resources#create
new_resource GET /resources/new(.:format) arpa/resources#new
edit_resource GET /resources/:id/edit(.:format) arpa/resources#edit
resource GET /resources/:id(.:format) arpa/resources#show
PATCH /resources/:id(.:format) arpa/resources#update
PUT /resources/:id(.:format) arpa/resources#update
DELETE /resources/:id(.:format) arpa/resources#destroy
DELETE /roles/:id(.:format) arpa/roles#remove
roles GET /roles(.:format) arpa/roles#index
POST /roles(.:format) arpa/roles#create
new_role GET /roles/new(.:format) arpa/roles#new
edit_role GET /roles/:id/edit(.:format) arpa/roles#edit
role GET /roles/:id(.:format) arpa/roles#show
PATCH /roles/:id(.:format) arpa/roles#update
PUT /roles/:id(.:format) arpa/roles#update
DELETE /roles/:id(.:format) arpa/roles#destroy
DELETE /profiles/:id(.:format) arpa/profiles#remove
profiles GET /profiles(.:format) arpa/profiles#index
POST /profiles(.:format) arpa/profiles#create
new_profile GET /profiles/new(.:format) arpa/profiles#new
edit_profile GET /profiles/:id/edit(.:format) arpa/profiles#edit
profile GET /profiles/:id(.:format) arpa/profiles#show
PATCH /profiles/:id(.:format) arpa/profiles#update
PUT /profiles/:id(.:format) arpa/profiles#update
DELETE /profiles/:id(.:format) arpa/profiles#destroyMIT License. Copyright Rachid Calazans.
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