show shared link enable button on disabled link page

app/controllers/templates_share_link_controller.rb

@@ -10,8 +10,12 @@ class TemplatesShareLinkController < ApplicationController
 
     @template.update!(template_params)
 
+    if params[:redir].present?
+      redirect_to params[:redir]
+    else
       head :ok
     end
+  end
 
   private
 

app/javascript/elements/check_on_click.js

@@ -1,7 +1,7 @@
 export default class extends HTMLElement {
   connectedCallback () {
     this.addEventListener('click', () => {
-      if (!this.element.checked) {
+      if (this.element && !this.element.disabled && !this.element.checked) {
         this.element.checked = true
         this.element.dispatchEvent(new Event('change', { bubbles: true }))
       }

app/views/start_form/private.html.erb

@@ -2,9 +2,7 @@
 <% I18n.with_locale(@template.account.locale) do %>
   <% content_for(:html_description, t('share_link_is_currently_disabled')) %>
 <% end %>
-<div class="max-w-md mx-auto px-2 mt-12 mb-4">
+<div class="max-w-md space-y-6 mx-auto px-2 mt-12 mb-4">
-  <div class="space-y-6 mx-auto">
-    <div class="space-y-6">
   <div class="text-center w-full space-y-6">
     <%= render 'banner' %>
     <p class="text-xl font-semibold text-center">
@@ -24,7 +22,10 @@
       </div>
     </div>
   </div>
-    </div>
+  <% if can?(:update, @template) %>
-  </div>
+    <toggle-submit class="block">
+      <%= button_to button_title(title: t('enable_shared_link'), icon: svg_icon('lock_open', class: 'w-6 h-6')), template_share_link_path(@template), params: { template: { shared_link: true }, redir: start_form_path(slug: @template.slug) }, method: :post, class: 'white-button w-full' %>
+    </toggle-submit>
+  <% end %>
 </div>
 <%= render 'shared/attribution', link_path: '/start', account: @template.account %>

spec/system/signing_form_spec.rb

@@ -848,6 +848,33 @@ RSpec.describe 'Signing Form' do
     end
   end
 
+  context 'when the template shared link is disabled' do
+    let(:template) do
+      create(:template, shared_link: false, account:, author:, only_field_types: %w[text])
+    end
+
+    context 'when user is logged in' do
+      before do
+        login_as author
+        visit start_form_path(slug: template.slug)
+      end
+
+      it 'shows a warning that the shared link is disabled and provides an option to enable it' do
+        expect(page).to have_content('Share link is currently disabled')
+        expect(page).to have_content(template.name)
+        expect(page).to have_button('Enable shared link')
+      end
+
+      it 'enables the shared link' do
+        expect do
+          click_button 'Enable shared link'
+        end.to change { template.reload.shared_link }.from(false).to(true)
+
+        expect(page).to have_content('You have been invited to submit a form')
+      end
+    end
+  end
+
   it 'sends completed email' do
     template = create(:template, account:, author:, only_field_types: %w[text signature])
     submission = create(:submission, template:)