Add logo to email header block

app/helpers/mail_digest_helper.rb

@@ -49,6 +49,11 @@ module MailDigestHelper
     timestamp_text(user, journal, extended_text)
   end
 
+  def email_image_tag(image, **options)
+    attachments[image] = File.read(Rails.root.join("app/assets/images/#{image}"))
+    image_tag attachments[image].url, **options
+  end
+
   def unique_reasons_of_notifications(notifications)
     notifications
       .map(&:reason_mail_digest)

app/views/digest_mailer/work_packages.html.erb

@@ -1,21 +1,30 @@
 <table width="100%" border="0" cellpadding="0" cellspacing="0" style="border-bottom: 1px solid #cccccc; margin-bottom: 30px;">
   <tr>
-    <td style="font-size: 24px; color: #333333; padding-bottom: 10px;">
-      <%= I18n.t(:'mail.digests.salutation', user: @user.firstname) %>
+    <td style="width: 82px; height: 82px; vertical-align: top;">
+      <%= email_image_tag("logo_openproject_narrow.svg", alt: I18n.t(:'mail.logo_alt_text')) %>
     </td>
-  </tr>
-  <tr>
-    <td style="font-size:14px; color: #1A67A3; font-weight: bold; padding-bottom: 10px;">
-      <%= digest_timespan_text(@notification_ids.length, @aggregated_notifications.length) %>
-    </td>
-  </tr>
-  <tr>
-    <td style="padding: 10px 0 25px 0;">
-      <a href="<%= notifications_center_url %>"
-         target="_blank"
-         style="background: #D1E5F5; padding: 8px 12px; color: #1A67A3; border: 1px solid #1A67A3; border-radius: 16px; text-decoration: none;">
-        <%= I18n.t(:'mail.digests.center') %>
-      </a>
+    <td width="100%" style="padding-top: 8px;">
+      <table>
+        <tr>
+          <td style="font-size: 24px; color: #333333; padding-bottom: 5px;">
+            <%= I18n.t(:'mail.digests.salutation', user: @user.firstname) %>
+          </td>
+        </tr>
+        <tr>
+          <td style="font-size:14px; color: #1A67A3; font-weight: bold; padding-bottom: 10px;">
+            <%= digest_timespan_text(@notification_ids.length, @aggregated_notifications.length) %>
+          </td>
+        </tr>
+        <tr>
+          <td style="padding: 10px 0 25px 0;">
+            <a href="<%= notifications_center_url %>"
+               target="_blank"
+               style="background: #D1E5F5; padding: 8px 12px; color: #1A67A3; border: 1px solid #1A67A3; border-radius: 16px; text-decoration: none;">
+              <%= I18n.t(:'mail.digests.center') %>
+            </a>
+          </td>
+        </tr>
+      </table>
     </td>
   </tr>
 </table>

config/locales/en.yml

@@ -1988,6 +1988,7 @@ en:
         subject: 'Daily project summary for %{date} - %{number} updates'
         updated: 'Updated'
         updated_at: '%{timestamp} ago by %{user}'
+    logo_alt_text: 'OpenProject Logo'
 
   mail_body_account_activation_request: "A new user (%{value}) has registered. The account is pending your approval:"
   mail_body_account_information: "Your account information"