Create and use external_link helper

Creates a helper method that takes body text and a url.

The output is a external link with icon.

It contains the noopenner noreferrer attributes for security.

Usage: external_link(domain.title, domain.url)

Add rspec test for ExternalLinkHelper

Add changelog for MR 32130

app/helpers/external_link_helper.rb

+# frozen_string_literal: true
+
+module ExternalLinkHelper
+  def external_link(body, url)
+    link_to url, target: '_blank', rel: 'noopener noreferrer' do
+      "#{body} #{icon('external-link')}".html_safe
+    end
+  end
+end

app/views/projects/pages/_access.html.haml

@@ -8,14 +8,10 @@
           = _("Your pages are served under:")
 
       %p
-        = link_to @project.pages_url, target: '_blank', rel: 'noopener noreferrer' do
-          = @project.pages_url
-          = icon('external-link')
+        = external_link(@project.pages_url, @project.pages_url)
 
       - @project.pages_domains.each do |domain|
         %p
-          = link_to domain.url, target: '_blank', rel: 'noopener noreferrer' do
-            = domain.url
-            = icon('external-link')
+          = external_link(domain.url, domain.url)
     .card-footer.alert-primary
       = _("It may take up to 30 minutes before the site is available after the first deployment.")

app/views/projects/pages/_list.html.haml

@@ -12,9 +12,7 @@
             .domain-status.ci-status-icon.has-tooltip{ class: "ci-status-icon-#{status}", title: tooltip }
               = sprite_icon("status_#{status}", size: 16 )
           .domain-name
-            = link_to domain.url, target: '_blank', rel: 'noopener noreferrer' do
-              = domain.url
-              = icon('external-link')
+            = external_link(domain.url, domain.url)
             - if domain.subject
               %div
                 %span.badge.badge-gray Certificate: #{domain.subject}

app/views/projects/pages_domains/show.html.haml

@@ -21,9 +21,7 @@
       %td
         = _("Domain")
       %td
-        = link_to @domain.url, target: :_blank, rel: 'noopener noreferrer' do
-          = @domain.url
-          = icon('external-link')
+        = external_link(@domain.url, @domain.url)
     %tr
       %td
         = _("DNS")

changelogs/unreleased/66067-pages-domain-doesnt-set-target-blank.yml

+---
+title: Makes custom Pages domain open as external link in new tab
+merge_request: 32130
+author: jakeburden
+type: fixed

spec/helpers/external_link_helper_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe ExternalLinkHelper do
+  include IconsHelper
+
+  it 'returns external link with icon' do
+    expect(external_link('https://gitlab.com', 'https://gitlab.com').to_s)
+      .to eq('<a target="_blank" rel="noopener noreferrer" href="https://gitlab.com">https://gitlab.com <i aria-hidden="true" data-hidden="true" class="fa fa-external-link"></i></a>')
+  end
+end