Allow Users to alter URLs submitted to Index Now and Key Location URL

While altering the key location URL could be a good idea, IMHO there's no reason to alter the page_url sent to index_now since it is an absolute URL of the entity.

There was an issue with projects using domains module with a domain per language that has been fixed on 3.1.x-dev #3558253: Error after submitting translation of node

I updated the issue title in that sense + removed the code you wrote about hook_index_now_page_url_alter() and only kept the hook_index_now_key_location_url_alter() + updated the tests

Can you please apply the patch https://git.drupalcode.org/project/index_now/-/merge_requests/34.diff and tell me if it suits your needs ?

Postpone this issue because I am not sure it is still needed.
I guess you had an issue because you were using domains module + index now and the bug has been fixed in #3558253: Error after submitting translation of node

I would need more information about your use case

The headless CMS use case described in #3586683: Provide a way to set a custom base URL for the index (headless CMS) is actually a compelling reason to provide a hook for altering the URLs submitted to Index Now - reopening this issue accordingly.

• !34 is for 3.1.x
• !60 is for 4.0.x

Manual testing procedure

The unit tests cover the hook invocation logic, but the following smoke test
verifies the full integration in a real Drupal instance.

Prerequisites

• A Drupal site with Index Now installed and configured (valid API key, a
  search engine selected)
• Verbose mode enabled at /admin/config/services/index_now so
  submissions appear in the logs

Step 1 — Implement the hook in a custom module

Create a file my_test.module in a temporary custom module and
add the following:

<?php
use Drupal\node\NodeInterface;

function my_test_index_now_url_alter(string &$url, array $context): void {
  $entity = $context['entity'] ?? NULL;
  // Log what we receive to verify the hook fires and the entity is available.
  \Drupal::logger('my_test')->info(
    'hook_index_now_url_alter fired. Original URL: @url. Entity: @entity.',
    [
      '@url' => $url,
      '@entity' => $entity instanceof NodeInterface
        ? $entity->getEntityTypeId() . ':' . $entity->id()
        : 'none',
    ]
  );
  // Optionally alter the URL to verify it is the one actually submitted:
  // $url = 'https://example.com/custom-path';
}

Step 2 — Trigger a ping

Save any existing node. Index Now should submit its URL to the configured
search engine.

Step 3 — Check the logs

Go to /admin/reports/dblog and filter by type
my_test. Verify that:

• The log entry appears (hook was invoked)
• The Original URL matches the node's canonical URL
• The Entity field shows node:<id> (entity is
  correctly passed in context)

Also check the index_now log entries to confirm the URL
submitted to the search engine matches what the hook returned.

Step 4 — Test hook_index_now_key_location_url_alter
(optional)

Add a second implementation to the same module:

function my_test_index_now_key_location_url_alter(string &$key_location): void {
  \Drupal::logger('my_test')->info('keyLocation: @loc', ['@loc' => $key_location]);
}

Save a node again and verify the log entry shows the expected key location
URL (should match $settings['index_now.base_url'] if configured,
or the Drupal site URL otherwise).