AO3-7397 Make skin preview page configurable

Author: nicolacleary

app/controllers/skins_controller.rb

@@ -134,8 +134,7 @@ def preview
     flash[:notice] << t(".preview.remove_skin")
     flash[:notice] << t(".preview.tip")
     flash[:notice] << ("<a href='#{skin_path(@skin)}' class='action' role='button'>".html_safe + t(".preview.return_to_skin") + "</a>".html_safe)
-    tag = FilterCount.where("public_works_count BETWEEN 10 AND 20").random_order.first.filter
-    redirect_to tag_works_path(tag, site_skin: @skin.id)
+    redirect_to "#{ArchiveConfig.SKIN_PREVIEW_URL}?site_skin=#{@skin.id}"
   end
 
   def set

config/config.yml

@@ -802,3 +802,9 @@ PSEUD_SHARDS: 5
 TAG_SHARDS: 5
 USER_SHARDS: 5
 WORKS_SHARDS: 5
+
+# The relative URL to redirect to when previewing a skin
+# e.g. /works -> http://test.archiveofourown.org/works?site_skin=[skin_id]
+# Production should pick something more suitable with roughly 1-20 works and
+# predictable content such as /users/OTW_Translation/works
+SKIN_PREVIEW_URL: '/works'

config/locales/controllers/en.yml

@@ -310,7 +310,7 @@ en:
       public_site_page_title: Public Site Skins
       public_work_page_title: Public Work Skins
     preview:
-      skin_title: "You are previewing the skin %{title}. This is a randomly chosen page."
+      skin_title: "You are previewing the skin %{title}."
       remove_skin: "Go back or click any link to remove the skin."
       tip: "Tip: You can preview any archive page you want by tacking on '?site_skin=[skin_id]' like you can see in the url above."
       return_to_skin: "Return To Skin To Use"

spec/controllers/skins_controller_spec.rb

@@ -133,6 +133,18 @@
     end
   end
 
+  describe "GET #preview" do
+    context "with a public site skin" do
+      let(:skin) { create(:skin, :public) }
+
+      it "redirects to the configured preview page" do
+        get :preview, params: { id: skin.id }
+        it_redirects_to_simple("#{ArchiveConfig.SKIN_PREVIEW_URL}?site_skin=#{skin.id}")
+        expect(flash[:notice]).to include("You are previewing the skin #{skin.title}.")
+      end
+    end
+  end
+
   describe "PUT #update" do
     shared_examples "an action guests and random logged-in users can't access" do |attribute:, value:|
       context "when logged in as a user who is not the skin author" do