Handle links with no href in VerifyLinkService (#20741)

Before this change, the following error would cause VerifyAccountLinksWorker to fail: NoMethodError: undefined method `downcase' for nil:NilClass [PROJECT_ROOT]/app/services/verify_link_service.rb:31 :in `block in link_back_present?`
2 years ago · daf6f3453e
--- a/app/services/verify_link_service.rb
+++ b/app/services/verify_link_service.rb
@ -28,7 +28,7 @@ class VerifyLinkService < BaseService

    links = Nokogiri::HTML(@body).xpath('//a[contains(concat(" ", normalize-space(@rel), " "), " me ")]|//link[contains(concat(" ", normalize-space(@rel), " "), " me ")]')

    if links.any? { |link| link['href'].downcase == @link_back.downcase }
    if links.any? { |link| link['href']&.downcase == @link_back.downcase }
      true
    elsif links.empty?
      false
@ -38,6 +38,8 @@ class VerifyLinkService < BaseService
  end

  def link_redirects_back?(test_url)
    return false if test_url.blank?

    redirect_to_url = Request.new(:head, test_url, follow: false).perform do |res|
      res.headers['Location']
    end
--- a/spec/services/verify_link_service_spec.rb
+++ b/spec/services/verify_link_service_spec.rb
@ -76,7 +76,25 @@ RSpec.describe VerifyLinkService, type: :service do
    context 'when a link does not contain a link back' do
      let(:html) { '' }

      it 'marks the field as verified' do
      it 'does not mark the field as verified' do
        expect(field.verified?).to be false
      end
    end

    context 'when link has no `href` attribute' do
      let(:html) do
        <<-HTML
          <!doctype html>
          <head>
            <link type="text/html" rel="me" />
          </head>
          <body>
            <a rel="me" target="_blank">Follow me on Mastodon</a>
          </body>
        HTML
      end

      it 'does not mark the field as verified' do
        expect(field.verified?).to be false
      end
    end