Add ability to delete files uploaded for settings in admin UI (#13192)

* Allow deleting site uploads

* Refactor and move links into hints

* Fix i18n tests

* Fix HTML output of site_upload_delete_hint

4 files changed, 39 insertions, 3 deletions

diff --git a/app/controllers/admin/site_uploads_controller.rb b/app/controllers/admin/site_uploads_controller.rb
new file mode 100644
index 000000000..cacecedb0
--- /dev/null
+++ b/app/controllers/admin/site_uploads_controller.rb
@@ -0,0 +1,21 @@
+# frozen_string_literal: true
+
+module Admin
+  class SiteUploadsController < BaseController
+    before_action :set_site_upload
+
+    def destroy
+      authorize :settings, :destroy?
+
+      @site_upload.destroy!
+
+      redirect_to edit_admin_settings_path, notice: I18n.t('admin.site_uploads.destroyed_msg')
+    end
+
+    private
+
+    def set_site_upload
+      @site_upload = SiteUpload.find(params[:id])
+    end
+  end
+end
diff --git a/app/helpers/admin/settings_helper.rb b/app/helpers/admin/settings_helper.rb
new file mode 100644
index 000000000..baf14ab25
--- /dev/null
+++ b/app/helpers/admin/settings_helper.rb
@@ -0,0 +1,11 @@
+# frozen_string_literal: true
+
+module Admin::SettingsHelper
+  def site_upload_delete_hint(hint, var)
+    upload = SiteUpload.find_by(var: var.to_s)
+    return hint unless upload
+
+    link = link_to t('admin.site_uploads.delete'), admin_site_upload_path(upload), data: { method: :delete }
+    safe_join([hint, link], '<br/>'.html_safe)
+  end
+end
diff --git a/app/policies/settings_policy.rb b/app/policies/settings_policy.rb
index 2dcb79f51..874f97bab 100644
--- a/app/policies/settings_policy.rb
+++ b/app/policies/settings_policy.rb
@@ -8,4 +8,8 @@ class SettingsPolicy < ApplicationPolicy
   def show?
     admin?
   end
+
+  def destroy?
+    admin?
+  end
 end
diff --git a/app/views/admin/settings/edit.html.haml b/app/views/admin/settings/edit.html.haml
index d7b493051..dc08f0141 100644
--- a/app/views/admin/settings/edit.html.haml
+++ b/app/views/admin/settings/edit.html.haml
@@ -30,13 +30,13 @@
 
   .fields-row
     .fields-row__column.fields-row__column-6.fields-group
-      = f.input :thumbnail, as: :file, wrapper: :with_block_label, label: t('admin.settings.thumbnail.title'), hint: t('admin.settings.thumbnail.desc_html')
+      = f.input :thumbnail, as: :file, wrapper: :with_block_label, label: t('admin.settings.thumbnail.title'), hint: site_upload_delete_hint(t('admin.settings.thumbnail.desc_html'), :thumbnail)
     .fields-row__column.fields-row__column-6.fields-group
-      = f.input :hero, as: :file, wrapper: :with_block_label, label: t('admin.settings.hero.title'), hint: t('admin.settings.hero.desc_html')
+      = f.input :hero, as: :file, wrapper: :with_block_label, label: t('admin.settings.hero.title'), hint: site_upload_delete_hint(t('admin.settings.hero.desc_html'), :hero)
 
   .fields-row
     .fields-row__column.fields-row__column-6.fields-group
-      = f.input :mascot, as: :file, wrapper: :with_block_label, label: t('admin.settings.mascot.title'), hint: t('admin.settings.mascot.desc_html')
+      = f.input :mascot, as: :file, wrapper: :with_block_label, label: t('admin.settings.mascot.title'), hint: site_upload_delete_hint(t('admin.settings.mascot.desc_html'), :mascot)
 
   %hr.spacer/