Add sign and verify to etablissement

app/models/etablissement.rb

@@ -2,6 +2,7 @@ class Etablissement < ApplicationRecord
   belongs_to :dossier
   belongs_to :entreprise, dependent: :destroy
 
+  has_one :champ, class_name: 'Champs::SiretChamp'
   has_many :exercices, dependent: :destroy
 
   accepts_nested_attributes_for :exercices
@@ -17,4 +18,19 @@ class Etablissement < ApplicationRecord
     # squeeze needed because of space in excess in the data
     "#{numero_voie} #{type_voie} #{nom_voie}, #{complement_adresse}, #{code_postal} #{localite}".squeeze(' ')
   end
+  def verify
+    SignatureService.verify(signature, message_for_signature)
+  end
+
+  def sign
+    SignatureService.sign(message_for_signature)
+  end
+
+  attr_accessor :signature
+
+  def message_for_signature
+    JSON.pretty_generate(as_json(include: {
+      exercices: { only: [:ca, :date_fin_exercice, :date_fin_exercice_timestamp] }
+    }).delete_if { |k,v| v.blank? })
+  end
 end

spec/models/etablissement_spec.rb

@@ -14,4 +14,24 @@ describe Etablissement do
 
     it { expect(etablissement.inline_adresse).to eq '6 RUE green moon, IMMEUBLE BORA, 92270 BOIS COLOMBES' }
   end
+
+  describe '#verify' do
+    let(:etablissement) { create(:etablissement) }
+    let(:etablissement2) { create(:etablissement) }
+
+    it 'should verify signed etablissement' do
+      etablissement.signature = etablissement.sign
+      expect(etablissement.verify).to eq(true)
+    end
+
+    it 'should reject etablissement with other etablissement signature' do
+      etablissement.signature = etablissement2.sign
+      expect(etablissement.verify).to eq(false)
+    end
+
+    it 'should reject etablissement with wrong signature' do
+      etablissement.signature = "fd7687fdsgdf6gd7f8g"
+      expect(etablissement.verify).to eq(false)
+    end
+  end
 end