Add DataExport file_url and filename methods

file_url creates a link with expiration time

filename is based in the creation date, resource type and format of the
export

app/mailers/data_export_mailer.rb

@@ -1,8 +1,6 @@
 class DataExportMailer < ApplicationMailer
   def completed
     @data_export = params[:data_export]
-    @download_url = "https://google.com"
-    @export_filename = "filename"
     user = @data_export.user
 
     return if @data_export.file.blank?

app/models/data_export.rb

@@ -21,4 +21,22 @@ def expired?
 
     expires_at < Time.zone.now
   end
+
+  def filename
+    return if file.blank?
+
+    "#{created_at.strftime('%Y%m%d%H%M%S')}_#{resource_type}.#{format}"
+  end
+
+  def file_url
+    return if file.blank?
+
+    blob_path = Rails.application.routes.url_helpers.rails_blob_path(
+      file,
+      host: 'void',
+      expires_in: 7.days
+    )
+
+    File.join(ENV['LAGO_API_URL'], blob_path)
+  end
 end

app/views/data_export_mailer/completed.slim

@@ -27,16 +27,11 @@ table style='margin-bottom: 32px' width="100%" cellspacing="0" cellpadding="0"
       table cellspacing="0" cellpadding="0"
         tr
           td style="border-radius: 12px;" bgcolor="#006CFA"
-            a href="#{@download_url}" download="#{@export_filename}" style="padding: 10px 16px;font-size: 16px; color: #ffffff;text-decoration: none;font-weight:bold;display: inline-block;font-weight: 400;font-style: normal;line-height: 24px;"
+            a href="#{@data_export.file_url}" download="#{@data_export.filename}" style="padding: 10px 16px;font-size: 16px; color: #ffffff;text-decoration: none;font-weight:bold;display: inline-block;font-weight: 400;font-style: normal;line-height: 24px;"
               = I18n.t('email.data_export.main_cta_label')
 div style='margin-bottom: 32px;font-style: normal;font-weight: 400;font-size: 16px;line-height: 24px;color: #19212E;'
   = I18n.t('email.data_export.fallback_text')
-  a href="#{@forgot_url}" target="_blank" style="color: #006CFA;text-decoration: none;"
-    = @forgot_url
 div style='font-style: normal;font-weight: 400;font-size: 16px;line-height: 24px;'
   = I18n.t('email.data_export.thanks')
 div style='margin-bottom: 32px;font-style: normal;font-weight: 400;font-size: 16px;line-height: 24px;color: #19212E;'
   = I18n.t('email.data_export.lago_team')
-div style='width: 100%;height: 1px;background-color: #D9DEE7;margin-bottom: 32px;'
-div style="color: #66758F;font-style: normal;font-weight: 400;font-size: 14px;line-height: 20px;"
-  = I18n.t('email.data_export.email_info')

spec/fixtures/export.csv

@@ -0,0 +1,3 @@
+invoice.lago_id,invoice.sequential_id,invoice.issuing_date,invoice.customer.customer_lago_id,invoice.customer.external_id,invoice.customer.country,invoice.customer.tax_identification_number,invoice.number,invoice.total_amount_cents,invoice.currency,invoice.invoice_type,invoice.payment_status,invoice.status,invoice.file_url,invoice.taxes_amount_cents,invoice.credit_notes_amount_cents,invoice.prepaid_credit_amount_cents,invoice.coupons_amount_cents,invoice.payment_due_date,invoice.payment_dispute_lost_at,invoice.payment_overdue
+292ef60b-9e0c-42e7-9f50-44d5af4162ec,1,2024-06-06,80ebcc26-3703-4577-b13e-765591255df4,hooli_1,US,US12345,TWI-2B86-170-001,1000,USD,subscription,pending,finalized,https://file1.com,100,0,1000,0,2024-06-06,,true
+7d430962-02cb-4183-b255-de3bb75af798,2,2024-06-07,80ebcc26-3703-4577-b13e-765591255df4,hooli_1,US,US12345,TWI-2B86-170-002,2000,USD,subscription,failed,draft,https://file2.com,200,100,0,0,2024-07-20,2024-06-06,false

spec/mailers/data_export_mailer_spec.rb

@@ -23,15 +23,15 @@
     context 'when data export is not completed' do
       let(:data_export) { create(:data_export, :processing) }
 
-      it 'does something' do
+      it 'returns a mailer with nil values' do
         expect(mailer.to).to be_nil
       end
     end
 
     context 'when data export has no attached file' do
       let(:data_export) { create(:data_export, :completed, file: nil) }
 
-      it 'does something' do
+      it 'returns a mailer with nil values' do
         expect(mailer.to).to be_nil
       end
     end

spec/models/data_export_spec.rb

@@ -28,4 +28,40 @@
       it { is_expected.to eq true }
     end
   end
+
+  describe '.filename' do
+    subject(:filename) { data_export.filename }
+
+    let(:data_export) { create :data_export, :completed }
+
+    it 'returns the file name' do
+      freeze_time do
+        timestamp = Time.zone.now.strftime('%Y%m%d%H%M%S')
+        expect(filename).to eq("#{timestamp}_invoices.csv")
+      end
+    end
+
+    context 'when data export does not have a file' do
+      let(:data_export) { create :data_export }
+
+      it { is_expected.to be_nil }
+    end
+  end
+
+  describe '.file_url' do
+    subject(:file_url) { data_export.file_url }
+
+    let(:data_export) { create :data_export, :completed }
+
+    it 'returns the file url' do
+      expect(file_url).to be_present
+      expect(file_url).to include(ENV['LAGO_API_URL'])
+    end
+
+    context 'when data export does not have a file' do
+      let(:data_export) { create :data_export }
+
+      it { is_expected.to be_nil }
+    end
+  end
 end