Emphasise ways to get help in user emails

We had a very prominent footer showing how to get in contact with the
local instance people but most users need to get in contact with the
enterprise they are buying from. So removing all those details and
replacing them by a simple "powered by" line will hopefully direct
attention to the shop's contact details.

app/assets/stylesheets/mail/email.scss

@@ -63,6 +63,12 @@ p.notice {
   margin-top: 20px;
 }
 
+.powered-by-ofn {
+  background-color: #ebebeb;
+  padding: .5em;
+  text-align: center;
+}
+
 table.social {
   background-color: #ebebeb;
 

app/helpers/mailer_helper.rb

@@ -0,0 +1,13 @@
+# frozen_string_literal: true
+
+module MailerHelper
+  def footer_ofn_link
+    ofn = I18n.t("shared.mailers.powered_by.open_food_network")
+
+    if ContentConfig.footer_email.present?
+      mail_to ContentConfig.footer_email, ofn
+    else
+      link_to ofn, "https://www.openfoodnetwork.org"
+    end
+  end
+end

app/mailers/spree/order_mailer.rb

@@ -6,6 +6,7 @@ module Spree
     helper SpreeCurrencyHelper
     helper Spree::Admin::PaymentsHelper
     helper OrderHelper
+    helper MailerHelper
     include I18nHelper
 
     def cancel_email(order_or_order_id, resend = false)

app/mailers/subscription_mailer.rb

@@ -1,5 +1,6 @@
 class SubscriptionMailer < Spree::BaseMailer
   helper CheckoutHelper
+  helper MailerHelper
   helper ShopMailHelper
   helper OrderHelper
   helper Spree::Admin::PaymentsHelper

app/views/shared/mailers/_powered_by.html.haml

@@ -0,0 +1,2 @@
+%p.powered-by-ofn
+  = t(".powered_html", open_food_network: footer_ofn_link)

app/views/spree/order_mailer/cancel_email.html.haml

@@ -26,4 +26,4 @@
     = t(".unpaid_order")
 
 = render 'signoff'
-= render 'shared/mailers/social_and_contact'
+= render 'shared/mailers/powered_by'

app/views/spree/order_mailer/confirm_email_for_customer.html.haml

@@ -25,4 +25,4 @@
 = render 'shipping'
 = render 'special_instructions'
 = render 'signoff'
-= render 'shared/mailers/social_and_contact'
+= render 'shared/mailers/powered_by'

app/views/spree/user_mailer/confirmation_instructions.html.haml

@@ -12,7 +12,7 @@
 
 = render 'shared/mailers/signoff'
 
-= render 'shared/mailers/social_and_contact'
+= render 'shared/mailers/powered_by'
 
 %p.notice
   = t :email_confirmation_notice_unexpected, sitename: @instance, contact: @contact

app/views/subscription_mailer/confirmation_summary_email.html.haml

@@ -19,4 +19,4 @@
 
 %p  
 = render 'shared/mailers/signoff'
-= render 'shared/mailers/social_and_contact'
+= render 'shared/mailers/powered_by'

app/views/subscription_mailer/placement_summary_email.html.haml

@@ -19,4 +19,4 @@
 
 %p  
 = render 'shared/mailers/signoff'
-= render 'shared/mailers/social_and_contact'
+= render 'shared/mailers/powered_by'

config/locales/en.yml

@@ -1252,6 +1252,10 @@ en:
       hide_closed_shops: "Hide closed shops"
       show_on_map: "Show all on the map"
   shared:
+    mailers:
+      powered_by:
+        open_food_network: "Open Food Network"
+        powered_html: "Your shopping experience is powered by the %{open_food_network}."
     menu:
       cart:
         cart: "Cart"

spec/mailers/order_mailer_spec.rb

@@ -132,6 +132,19 @@ describe Spree::OrderMailer do
         Spree::OrderMailer.confirm_email_for_customer(order.id).deliver_now
         expect(ActionMailer::Base.deliveries.first.reply_to).to eq([distributor.contact.email])
       end
+
+      it "includes a link to the configured instance email address" do
+        mail = Spree::OrderMailer.confirm_email_for_customer(order.id)
+
+        expect(mail.body.encoded).to include "mailto:hello@openfoodnetwork.org"
+      end
+
+      it "includes a link to the OFN global website if no email address is available" do
+        expect(ContentConfig).to receive(:footer_email).and_return("")
+        mail = Spree::OrderMailer.confirm_email_for_customer(order.id)
+
+        expect(mail.body.encoded).to include "https://www.openfoodnetwork.org"
+      end
     end
 
     describe "for shops" do