Support link verification with redirects (#8735)

(e.g. URL shortener)
6 years ago · f92f1ee80a
--- a/app/services/verify_link_service.rb
+++ b/app/services/verify_link_service.rb
@ -27,6 +27,22 @@ class VerifyLinkService < BaseService
  def link_back_present?
    return false if @body.empty?

    Nokogiri::HTML(@body).xpath('//a[contains(concat(" ", normalize-space(@rel), " "), " me ")]|//link[contains(concat(" ", normalize-space(@rel), " "), " me ")]').any? { |link| link['href'] == @link_back }
    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'] == @link_back }
      true
    elsif links.empty?
      false
    else
      link_redirects_back?(links.first['href'])
    end
  end

  def link_redirects_back?(test_url)
    redirect_to_url = Request.new(:head, test_url, follow: false).perform do |res|
      res.headers['Location']
    end

    redirect_to_url == @link_back
  end
 end
--- a/spec/services/verify_link_service_spec.rb
+++ b/spec/services/verify_link_service_spec.rb
@ -7,6 +7,7 @@ RSpec.describe VerifyLinkService, type: :service do
  let(:field)   { Account::Field.new(account, 'name' => 'Website', 'value' => 'http://example.com') }

  before do
    stub_request(:head, 'https://redirect.me/abc').to_return(status: 301, headers: { 'Location' => ActivityPub::TagManager.instance.url_for(account) })
    stub_request(:get, 'http://example.com').to_return(status: 200, body: html)
    subject.call(field)
  end
@ -56,6 +57,21 @@ RSpec.describe VerifyLinkService, type: :service do
    end
  end

  context 'when a link goes through a redirect back' do
    let(:html) do
      <<-HTML
        <!doctype html>
        <head>
          <link type="text/html" href="https://redirect.me/abc" rel="me" />
        </head>
      HTML
    end

    it 'marks the field as verified' do
      expect(field.verified?).to be true
    end
  end

  context 'when a link does not contain a link back' do
    let(:html) { '' }