Clear root folder when WPML uses a directory for the default language

[DahmaniAdame]

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• Made sure you’re on the latest version 3.12.3.2
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Describe the bug
When WPML uses the option use directory for default language, the root folder is inaccessible by any of our cache-purging function.

The default language will have a separate folder from the root in this scenario.

We are doing that kind of check when WPML is enabled:

wp-rocket/inc/functions/files.php

Lines 711 to 713 in 8c603e2

	$urls = ( ! $lang || is_object( $lang ) || is_array( $lang ) || is_int( $lang ) )
	? (array) get_rocket_i18n_uri()
	: (array) get_rocket_i18n_home_url( $lang );

We need compatibility with WPML to detect that the sub-option is enabled and include the root folder in actions.

Temporarily fixed by clearing files from root using:

function rocket_remove_root_cached_files( $post, $purge_urls, $lang ) {
	$cache_folder_path = _rocket_get_wp_rocket_cache_path() . $_SERVER['SERVER_NAME'] . "/";
	$cache_folder_directory = dir($cache_folder_path);
	while ($file = $cache_folder_directory->read()) {
		if (!strpos($file,'.html')) continue;
		unlink($cache_folder_path . $file);
	}
}
add_action( 'after_rocket_clean_home', 'rocket_remove_root_cached_files', 10, 3 );
add_action( 'after_rocket_clean_domain', 'rocket_remove_root_cached_files', 10, 3 );

To Reproduce
Steps to reproduce the behavior:

1. Use WPML and enable use directory for default language
2. Make sure the root homepage is cached
3. Try to purge cache
4. See error

Expected behavior
All caches should be accessible to purge regardless of what options are enabled on WPML.

Screenshots
Added to decription.

Additional context
Ticket - https://secure.helpscout.net/conversation/2071911982/382573/

Backlog Grooming (for WP Media dev team use only)

• Reproduce the problem
• Identify the root cause
• Scope a solution
• Estimate the effort

[webtrainingwheels]

I think it's the same as this one?
#1890

[DahmaniAdame]

@webtrainingwheels, it's the same issue, indeed.
@piotrbak we can close #1890 since this one is more recent and has more details.

[CrochetFeve0251]

Reproduce the problem

I reproduced the issue locally.

Identify the root cause

The root problem is mentionned by @DahmaniAdame.

Scope a solution

For the solution in the WPML subscriber we will add the following callback:

public function remove_root_cached_files() {
		$site_url = home_url();
		$host_name = parse_url( $site_url, PHP_URL_HOST );
		$cache_folder_path = _rocket_get_wp_rocket_cache_path() . $host_name . "/";
		$cache_folder_directory = $this->filesystem->dirlist($cache_folder_path);
		foreach (array_keys($cache_folder_directory) as $entry) {
			if ($this->filesystem->is_dir($entry)) {
				continue;
			}
			$this->filesystem->delete($cache_folder_path . $entry);
		}
	}

That we will subscribe to the events:

• after_rocket_clean_home
• after_rocket_clean_domain

Estimate the effort

Effort S

PS: Thank you for the base template @DahmaniAdame