Issue #3256453 by gbyte, WalkingDexter, noda: Add IndexNow capability to search engine integration

### PERMISSIONS ###

The module permission 'administer sitemap settings' can be configured under

/admin/people/permissions.

admin/people/permissions.

### SITEMAP VARIANTS ###

plugin and several URL generator plugins. These plugins can be implemented by

custom modules. The module comes with the default sitemap type

'default_hreflang'. Sitemap types can be defined via the UI under

/admin/config/search/simplesitemap/types.

admin/config/search/simplesitemap/types.

### ENTITIES ###

Initially only the home page is indexed in the default sitemap. To

include content into a sitemap, visit

/admin/config/search/simplesitemap/entities to enable support for entity types

admin/config/search/simplesitemap/entities to enable support for entity types

of your choosing. Bundleless entity types can be configured right on that page,

for bundles of entity types visit the bundle's configuration pages, e.g.

 * /admin/structure/types/manage/[content type] for nodes

 * /admin/structure/taxonomy/manage/[taxonomy vocabulary] for taxonomy terms

 * /admin/structure/menu/manage/[menu] for menu items

 * admin/structure/types/manage/[content type] for nodes

 * admin/structure/taxonomy/manage/[taxonomy vocabulary] for taxonomy terms

 * admin/structure/menu/manage/[menu] for menu items

 * ...

When including an entity type or bundle into a sitemap, the priority setting

### CUSTOM LINKS ###

To include custom links into a sitemap, visit

/admin/config/search/simplesitemap/custom.

admin/config/search/simplesitemap/custom.

### AUTOMATIC SUBMISSION ###

### SEARCH ENGINES ###

The module can submit sitemap changes to search engines as well as notify search

engines of entity changes directly.

These functionalities are available through the included simple_sitemap_engines

submodule. After enabling this module, go to

admin/config/search/simplesitemap/engines/settings to set it up.

#### SITEMAP SUBMISSION ####

It is possible to have the module automatically submit specific sitemap

variants to search engines. Google and Bing are preconfigured.

variants to search engines. Google is preconfigured and new engines can be added

programmatically via simple_sitemap_engine entities. Specific sitemap variants

can be submitted to specific search engines, the time interval is configurable.

This functionality is available through the included simple_sitemap_engines

submodule. After enabling this module, go to

admin/config/search/simplesitemap/engines/settings to set it up. Further engines

can be added programmatically via simple_sitemap_engine configuration entities.

#### INDEXNOW SUBMISSION ####

The module also supports the IndexNow service provided by Bing and Yandex. The

two search engines are preconfigured and new engines can be added

programmatically via simple_sitemap_engine entities. For the submission to work,

a key needs to be generated under

admin/config/search/simplesitemap/engines/settings and entities need to be

included under admin/config/search/simplesitemap/entities.

### PERFORMANCE ###

The module can be tuned via UI for a vast improvement in generation speeds on

huge sites. To speed up generation, go to

admin/config/search/simplesitemap/engines/settings and increase

admin/config/search/simplesitemap/settings and increase

'Entities per queue item' and 'Sitemap generation max duration'.

Further things that can be tweaked are unchecking 'Exclude duplicate links' and

base_url: ''

default_variant: 'default'

custom_links_include_images: false

disable_language_hreflang: false

excluded_languages: []

enabled_entity_types:

  - 'node'

  Drupal.behaviors.simpleSitemapFieldsetSummaries = {

    attach: function (context) {

      $(context).find('.simple-sitemap-fieldset').drupalSetSummary(function (context) {

        var enabledVariants = [];

        let summary = '', enabledVariants = [];

        $(context).find('input:checkbox[name$="[index_now]"]').each(function () {

          summary = (this.checked ? Drupal.t('IndexNow notification enabled') : Drupal.t('IndexNow notification disabled')) + ', ';

        });

        $(context).find('input:radio:checked[data-simple-sitemap-label][value="1"]').each(function () {

          enabledVariants.push(this.dataset.simpleSitemapLabel);

        });

        if (enabledVariants.length > 0) {

          return Drupal.t('Included in sitemaps: ') + enabledVariants.join(', ');

          summary += Drupal.t('Included in sitemaps: ') + enabledVariants.join(', ');

        }

        else {

          return Drupal.t('Excluded from all sitemaps');

          summary += Drupal.t('Excluded from all sitemaps');

        }

        return summary;

      });

    }

  };

  Drupal.behaviors.simpleSitemapEntities = {

    attach: function () {

      var $checkboxes = $('table tr.protected input:checkbox:checked').once('simple-sitemap-entities');

      let $checkboxes = $('table tr.protected input:checkbox:checked').once('simple-sitemap-entities');

      if ($checkboxes.length) {

        $checkboxes.on('change', function () {

          var $row = $(this).closest('tr');

          var $table = $row.closest('table');

          let $row = $(this).closest('tr');

          let $table = $row.closest('table');

          $row.toggleClass('color-success color-warning');

          var showWarning = $table.find('tr.color-warning').length > 0;

          var $warning = $('.simple-sitemap-entities-warning');

          let showWarning = $table.find('tr.color-warning').length > 0;

          let $warning = $('.simple-sitemap-entities-warning');

          if (showWarning && !$warning.length) {

            $(Drupal.theme('simpleSitemapEntitiesWarning')).insertBefore($table);

enabled: true

submission_interval: 24

index_now_enabled: true

index_now_preferred_engine: ''

index_now_on_entity_save: false