[deploy] Add LiquidTagsController (#10241)

app/controllers/liquid_tags_controller.rb

@@ -0,0 +1,13 @@
+class LiquidTagsController < ApplicationController
+  before_action :authenticate_user!
+
+  FILTER_REGEX = /^(?:NullTag|Liquid::)/.freeze
+
+  def index
+    custom_tags = Liquid::Template.tags.filter_map do |name, tag|
+      name unless tag.match?(FILTER_REGEX)
+    end.sort
+
+    render json: { liquid_tags: custom_tags }
+  end
+end

config/routes.rb

@@ -284,6 +284,8 @@ Rails.application.routes.draw do
     resources :profiles, only: %i[update]
     resources :profile_field_groups, only: %i[index], defaults: { format: :json }
 
+    resources :liquid_tags, only: %i[index], defaults: { format: :json }
+
     get "/verify_email_ownership", to: "email_authorizations#verify", as: :verify_email_authorizations
     get "/search/tags" => "search#tags"
     get "/search/chat_channels" => "search#chat_channels"

spec/requests/liquid_tags_request_spec.rb

@@ -0,0 +1,28 @@
+require "rails_helper"
+
+RSpec.describe "LiquidTags", type: :request do
+  describe "GET /liquid_tags" do
+    context "when not signed in do" do
+      it "returns a list of all custom Liquid tags" do
+        get liquid_tags_path
+
+        expect(response).to have_http_status(:unauthorized)
+      end
+    end
+
+    context "when signed in" do
+      let(:user) { create(:user) }
+
+      before { sign_in(user) }
+
+      it "returns an array of all custom Liquid tags", :aggregate_failures do
+        get liquid_tags_path
+
+        expect(response).to have_http_status(:ok)
+        json = response.parsed_body
+        expect(json["liquid_tags"]).to be_an_instance_of(Array)
+        expect(json["liquid_tags"]).not_to be_empty
+      end
+    end
+  end
+end