DEV: Create form templates (#20189)

app/controllers/admin/form_templates_controller.rb

@@ -0,0 +1,58 @@
+# frozen_string_literal: true
+
+class Admin::FormTemplatesController < Admin::StaffController
+  before_action :ensure_form_templates_enabled
+
+  def index
+    form_templates = FormTemplate.all
+    render_serialized(form_templates, AdminFormTemplateSerializer, root: "form_templates")
+  end
+
+  def new
+  end
+
+  def create
+    params.require(:name)
+    params.require(:template)
+
+    begin
+      template = FormTemplate.create!(name: params[:name], template: params[:template])
+      render_serialized(template, AdminFormTemplateSerializer, root: "form_template")
+    rescue FormTemplate::NotAllowed => err
+      render_json_error(err.message)
+    end
+  end
+
+  def show
+    template = FormTemplate.find(params[:id])
+    render_serialized(template, AdminFormTemplateSerializer, root: "form_template")
+  end
+
+  def edit
+    FormTemplate.find(params[:id])
+  end
+
+  def update
+    template = FormTemplate.find(params[:id])
+
+    begin
+      template.update!(name: params[:name], template: params[:template])
+      render_serialized(template, AdminFormTemplateSerializer, root: "form_template")
+    rescue FormTemplate::NotAllowed => err
+      render_json_error(err.message)
+    end
+  end
+
+  def destroy
+    template = FormTemplate.find(params[:id])
+    template.destroy!
+
+    render json: success_json
+  end
+
+  private
+
+  def ensure_form_templates_enabled
+    raise Discourse::InvalidAccess.new unless SiteSetting.experimental_form_templates
+  end
+end