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Editing: class-homepage.php

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<?php
namespace WP_Rocket\Preload;

/**
 * Preloads the homepage and the internal URLs on it
 *
 * @since 3.2
 * @author Remy Perona
 */
class Homepage extends Abstract_Preload {
	/**
	 * Gets the internal URLs on the homepage and sends them to the preload queue
	 *
	 * @since 3.2
	 * @author Remy Perona
	 *
	 * @param array $home_urls Homepages URLs to preload.
	 * @return void
	 */
	public function preload( $home_urls ) {
		$preload = 0;
		foreach ( $home_urls as $home_url ) {
			$urls = $this->get_urls( $home_url );

if ( ! $urls ) {
				continue;
			}

$home_host = wp_parse_url( $home_url, PHP_URL_HOST );

foreach ( $urls as $url ) {
				if ( ! $this->should_preload( $url, $home_url, $home_host ) ) {
					continue;
				}

$this->preload_process->push_to_queue( $url );
				$preload++;
			}
		}

if ( 0 === $preload ) {
			return;
		}

set_transient( 'rocket_preload_running', 0 );
		$this->preload_process->save()->dispatch();
	}

/**
	 * Gets links in the content of the URL provided
	 *
	 * @since 3.2.2
	 * @author Remy Perona
	 *
	 * @param string $url URL to get content and links from.
	 * @return bool|array
	 */
	private function get_urls( $url ) {
		/**
		 * Filters the arguments for the partial preload request
		 *
		 * @since 3.2
		 * @author Remy Perona
		 *
		 * @param array $args Request arguments.
		 */
		$args = apply_filters(
			'rocket_homepage_preload_url_request_args',
			[
				'timeout'    => 10,
				'user-agent' => 'WP Rocket/Homepage_Preload',
				'sslverify'  => apply_filters( 'https_local_ssl_verify', false ), // WPCS: prefix ok.
			]
		);

$response         = wp_remote_get( $url, $args );
		$errors           = get_transient( 'rocket_preload_errors' );
		$errors           = is_array( $errors ) ? $errors : [];
		$errors['errors'] = isset( $errors['errors'] ) && is_array( $errors['errors'] ) ? $errors['errors'] : [];

if ( is_wp_error( $response ) ) {
			// Translators: %1$s is an URL, %2$s is the error message, %3$s = opening link tag, %4$s = closing link tag.
			$errors['errors'][] = sprintf( __( 'Preload encountered an error. Could not gather links on %1$s because of the following error: %2$s. %3$sLearn more%4$s.', 'rocket' ), $url, $response->get_error_message(), '<a href="https://docs.wp-rocket.me/article/1065-sitemap-preload-is-slow-or-some-pages-are-not-preloaded-at-all#failed-preload" rel="noopener noreferrer" target=_"blank">', '</a>' );

set_transient( 'rocket_preload_errors', $errors );
			return false;
		}

$response_code = wp_remote_retrieve_response_code( $response );

if ( 200 !== $response_code ) {
			switch ( $response_code ) {
				case 401:
				case 403:
					// Translators: %1$s is an URL, %2$s is the HTTP response code, %3$s = opening link tag, %4$s = closing link tag.
					$errors['errors'][] = sprintf( __( 'Preload encountered an error. %1$s is not accessible to due to the following response code: %2$s. Security measures could be preventing access. %3$sLearn more%4$s.', 'rocket' ), $url, $response_code, '<a href="https://docs.wp-rocket.me/article/1065-sitemap-preload-is-slow-or-some-pages-are-not-preloaded-at-all#failed-preload" rel="noopener noreferrer" target=_"blank">', '</a>' );

set_transient( 'rocket_preload_errors', $errors );
					break;
				case 404:
					// Translators: %1$s is an URL, %2$s = opening link tag, %3$s = closing link tag.
					$errors['errors'][] = sprintf( __( 'Preload encountered an error. %1$s is not accessible to due to the following response code: 404. Please make sure your homepage is accessible in your browser. %2$sLearn more%3$s.', 'rocket' ), $url, '<a href="https://docs.wp-rocket.me/article/1065-sitemap-preload-is-slow-or-some-pages-are-not-preloaded-at-all#failed-preload" rel="noopener noreferrer" target=_"blank">', '</a>' );

set_transient( 'rocket_preload_errors', $errors );
					break;
				case 500:
					// Translators: %1$s is an URL, %2$s = opening link tag, %3$s = closing link tag.
					$errors['errors'][] = sprintf( __( 'Preload encountered an error. %1$s is not accessible to due to the following response code: 500. Please check with your web host about server access. %2$sLearn more%3$s.', 'rocket' ), $url, '<a href="https://docs.wp-rocket.me/article/1065-sitemap-preload-is-slow-or-some-pages-are-not-preloaded-at-all#failed-preload" rel="noopener noreferrer" target=_"blank">', '</a>' );

set_transient( 'rocket_preload_errors', $errors );
					break;
				default:
					// Translators: %1$s is an URL, %2$s is the HTTP response code, %3$s = opening link tag, %4$s = closing link tag.
					$errors['errors'][] = sprintf( __( 'Preload encountered an error. Could not gather links on %1$s because it returned the following response code: %2$s. %3$sLearn more%4$s.', 'rocket' ), $url, $response_code, '<a href="https://docs.wp-rocket.me/article/1065-sitemap-preload-is-slow-or-some-pages-are-not-preloaded-at-all#failed-preload" rel="noopener noreferrer" target=_"blank">', '</a>' );

set_transient( 'rocket_preload_errors', $errors );
					break;
			}

return false;
		}

$content = wp_remote_retrieve_body( $response );

preg_match_all( '/<a\s+(?:[^>]+?[\s"\']|)href\s*=\s*(["\'])(?<href>[^"\']+)\1/imU', $content, $urls );

return array_unique( $urls['href'] );
	}

/**
	 * Checks if the URL should be preloaded
	 *
	 * @since 3.2.2
	 * @author Remy Perona
	 *
	 * @param string $url URL to check.
	 * @param string $home_url Homepage URL.
	 * @param string $home_host Homepage host.
	 * @return bool
	 */
	private function should_preload( $url, $home_url, $home_host ) {
		$url = html_entity_decode( $url ); // & symbols in URLs are changed to &#038; when using WP Menu editor

$url_data = get_rocket_parse_url( $url );

if ( empty( $url_data ) ) {
			return false;
		}

if ( ! empty( $url_data['fragment'] ) ) {
			return false;
		}

if ( empty( $url_data['host'] ) ) {
			$url = home_url( $url );
		}

$url = \rocket_add_url_protocol( $url );

if ( $url === $home_url ) {
			return false;
		}

if ( $home_host !== $url_data['host'] ) {
			return false;
		}

if ( $this->is_file_url( $url ) ) {
			return false;
		}

if ( ! empty( $url_data['path'] ) && preg_match( '#^(' . \get_rocket_cache_reject_uri() . ')$#', $url_data['path'] ) ) {
			return false;
		}

$cache_query_strings = implode( '|', \get_rocket_cache_query_string() );

if ( ! empty( $url_data['query'] ) && ! preg_match( '/(' . $cache_query_strings . ')/iU', $url_data['query'] ) ) {
			return false;
		}

return true;
	}

/**
	 * Checks if URL is an URL to a file
	 *
	 * @since 3.2.2
	 * @author Remy Perona
	 *
	 * @param string $url URL to check.
	 * @return bool
	 */
	private function is_file_url( $url ) {
		/**
		 * Filters the list of files types to check when getting URLs on the homepage
		 *
		 * @since 3.2.2
		 * @author Remy Perona
		 *
		 * @param array $file_types Array of file extensions.
		 */
		$file_types = apply_filters(
			'rocket_preload_file_types',
			[
				'jpg',
				'jpeg',
				'jpe',
				'png',
				'gif',
				'webp',
				'bmp',
				'tiff',
				'mp3',
				'ogg',
				'mp4',
				'm4v',
				'avi',
				'mov',
				'flv',
				'swf',
				'webm',
				'pdf',
				'doc',
				'docx',
				'txt',
				'zip',
				'tar',
				'bz2',
				'tgz',
				'rar',
			]
		);

$file_types = implode( '|', $file_types );

if ( preg_match( '#\.(?:' . $file_types . ')$#iU', $url ) ) {
			return true;
		}

return false;
	}
}

Editing: class-homepage.php

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