[Fix #196] AttestionTemplate: add preview

app/controllers/admin/attestation_templates_controller.rb

@@ -39,6 +39,21 @@ class Admin::AttestationTemplatesController < AdminController
     redirect_to edit_admin_procedure_attestation_template_path(@procedure)
   end
 
+  def preview
+    @title      = activated_attestation_params[:title]
+    @body       = activated_attestation_params[:body]
+    @footer     = activated_attestation_params[:footer]
+    @created_at = DateTime.now
+
+    # In a case of a preview, when the user does not change its images,
+    # the images are not uploaded and thus should be retrieved from previous
+    # attestation_template
+    @logo = activated_attestation_params[:logo] || @procedure.attestation_template&.logo
+    @signature = activated_attestation_params[:signature] || @procedure.attestation_template&.signature
+
+    render 'admin/attestation_templates/show', formats: [:pdf]
+  end
+
   private
 
   def activated_attestation_params

app/views/admin/attestation_templates/edit.html.haml

@@ -61,6 +61,8 @@
       ~ f.text_area :footer, class: 'form-control', rows: 2,
         placeholder: "Direction interministérielle du numérique et du système d'information et de communication de l'Etat (DINSIC)"
 
+    %button.btn.btn-primary{ formaction: admin_procedure_attestation_template_preview_path, formtarget: '_blank' } Prévisualiser
+
     .pull-right
       - if @attestation_template.activated
         %button.btn.btn-warning{ formaction: admin_procedure_attestation_template_disactivate_path } désactiver l'attestation

app/views/admin/attestation_templates/show.pdf.prawn

@@ -0,0 +1,38 @@
+require 'prawn/measurement_extensions'
+
+prawn_document(margin: [50, 100, 20, 100]) do |pdf|
+  pdf.font_families.update( 'open sans' => { normal: './lib/prawn/fonts/OpenSans-Regular.ttf' })
+  pdf.font 'open sans'
+
+  grey = '555555'
+  black = '333333'
+  max_logo_size = 40.mm
+  max_signature_size = 40.mm
+
+  pdf.bounding_box([0, pdf.cursor], width: 400, height: 650) do
+    if @logo.present?
+      pdf.image StringIO.new(@logo.read), fit: [max_logo_size , max_logo_size], position: :center
+    end
+
+    pdf.fill_color grey
+    pdf.pad_top(40) { pdf.text "le #{l(@created_at, format: '%e %B %Y')}", size: 10, align: :right, character_spacing: -0.5 }
+
+    pdf.fill_color black
+    pdf.pad_top(40) { pdf.text @title, size: 18, character_spacing: -0.2 }
+
+    pdf.fill_color grey
+    pdf.pad_top(30) { pdf.text @body, size: 10, character_spacing: -0.2 }
+
+    if @signature.present?
+      pdf.pad_top(40) do
+        pdf.image StringIO.new(@signature.read), fit: [max_signature_size , max_signature_size], position: :right
+      end
+    end
+  end
+
+  pdf.repeat(:all) do
+    pdf.move_cursor_to 20
+    pdf.fill_color grey
+    pdf.text @footer, align: :center, size: 8
+  end
+end

config/routes.rb

@@ -148,6 +148,9 @@ Rails.application.routes.draw do
 
       post 'attestation_template/disactivate' => 'attestation_templates#disactivate'
       patch 'attestation_template/disactivate' => 'attestation_templates#disactivate'
+
+      post 'attestation_template/preview' => 'attestation_templates#preview'
+      patch 'attestation_template/preview' => 'attestation_templates#preview'
     end
 
     namespace :accompagnateurs do

spec/controllers/admin/attestation_templates_controller_spec.rb

@@ -7,6 +7,38 @@ describe Admin::AttestationTemplatesController, type: :controller do
 
   before do
     sign_in admin
+    Timecop.freeze(Time.now)
+  end
+
+  describe 'POST #preview' do
+    let(:upload_params) { { title: 't', body: 'b', footer: 'f' } }
+
+    before do
+      post :preview,
+           params: { procedure_id: procedure.id,
+                     attestation_template: upload_params }
+    end
+
+    context 'if an attestation template does not exist on the procedure' do
+      let(:attestation_template) { nil }
+      it { expect(subject.status).to eq(200) }
+      it { expect(assigns).to include(upload_params.stringify_keys) }
+    end
+
+    context 'if an attestation template exists on the procedure' do
+      context 'with logos' do
+        let!(:attestation_template) do
+          create(:attestation_template, logo: logo, signature: signature)
+        end
+
+        it { expect(subject.status).to eq(200) }
+        it { expect(assigns).to include(upload_params.stringify_keys) }
+        it { expect(assigns[:created_at]).to eq(DateTime.now) }
+        it { expect(assigns(:logo).read).to eq(logo.read) }
+        it { expect(assigns(:signature).read).to eq(signature.read) }
+        after { procedure.attestation_template.destroy }
+      end
+    end
   end
 
   describe 'GET #edit' do