- valid siren on create file

app/controllers/users/dossiers_controller.rb

@@ -1,5 +1,6 @@
 class Users::DossiersController < UsersController
   before_action :authenticate_user!
+  before_action :check_siret, only: :create
 
   def index
     order = 'DESC'
@@ -74,8 +75,7 @@ class Users::DossiersController < UsersController
     redirect_to url_for(controller: :dossiers, action: :show, id: @dossier.id)
 
   rescue RestClient::ResourceNotFound
-    flash.alert = t('errors.messages.invalid_siret')
+    errors_valid_siret
-    redirect_to url_for new_users_dossiers_path(procedure_id: create_params[:procedure_id])
 
   rescue ActiveRecord::RecordNotFound
     flash.alert = t('errors.messages.dossier_not_found')
@@ -115,6 +115,15 @@ class Users::DossiersController < UsersController
 
   private
 
+  def check_siret
+    errors_valid_siret unless Siret.new(siret: siret).valid?
+  end
+
+  def errors_valid_siret
+    flash.alert = t('errors.messages.invalid_siret')
+    redirect_to url_for new_users_dossiers_path(procedure_id: create_params[:procedure_id])
+  end
+
   def update_params
     params.require(:dossier).permit(:autorisation_donnees)
   end

app/models/siret.rb

@@ -0,0 +1,7 @@
+class Siret
+  include ActiveModel::Model
+  attr_accessor :siret
+
+  validates_presence_of :siret
+  validates :siret, siret_format: true
+end

app/validators/siret_format_validator.rb

@@ -0,0 +1,21 @@
+class SiretFormatValidator < ActiveModel::EachValidator
+  def validate_each(record,attribute,value)
+    unless value =~ /^\d{14}$/
+      record.errors.add(attribute, :format)
+    end
+    unless value!= nil && (luhn_checksum(value) % 10 == 0)
+      record.errors.add(attribute, :checksum)
+    end
+  end
+
+  private
+  def luhn_checksum(value)
+    accum = 0
+    value.reverse.each_char.map(&:to_i).each_with_index do |digit, index|
+      t = index.even? ? digit : digit * 2
+      t = t - 9 if t >= 10
+      accum += t
+    end
+    accum
+  end
+end

config/application.rb

@@ -21,7 +21,7 @@ module TPS
     config.i18n.default_locale = :fr
     config.i18n.load_path += Dir[Rails.root.join('config', 'locales', '**', '*.{rb,yml}')]
 
-    config.autoload_paths += %W(#{config.root}/lib)
+    config.autoload_paths += %W(#{config.root}/lib #{config.root}/app/validators)
     config.assets.paths << Rails.root.join('app', 'assets', 'javascript')
     config.assets.paths << Rails.root.join('app', 'assets', 'javascript', 'api_carto')
     config.assets.paths << Rails.root.join('app', 'assets', 'javascript', 'api_carto', 'lib')

spec/models/siret_spec.rb

@@ -0,0 +1,27 @@
+require 'spec_helper'
+
+describe Siret, type: :model do
+
+  let(:valid_siret) { '41816609600051' }
+  let(:invalid_siret) { '111111111' }
+
+  context 'with no siret provided' do
+    it { is_expected.to validate_presence_of(:siret) }
+  end
+
+  context 'init with valid siret' do
+    it { is_expected.to allow_value(valid_siret).for(:siret) }
+  end
+
+  context 'init with invalid siret' do
+    it { is_expected.not_to allow_value(invalid_siret).for(:siret) }
+  end
+
+  context 'init with bullshit siret' do
+    it { is_expected.not_to allow_value('bullshit').for(:siret) }
+  end
+
+  context 'init with a siret that is too long' do
+    it { is_expected.not_to allow_value('9' * 15).for(:siret) }
+  end
+end