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Editing: CDN.php

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<?php
namespace WP_Rocket\CDN;

use WP_Rocket\Admin\Options_Data;

/**
 * CDN class
 *
 * @since 3.4
 * @author Remy Perona
 */
class CDN {
	/**
	 * WP Rocket Options instance
	 *
	 * @var Options_Data
	 */
	private $options;

/**
	 * Constructor
	 *
	 * @param Options_Data $options WP Rocket Options instance.
	 */
	public function __construct( Options_Data $options ) {
		$this->options = $options;
	}

/**
	 * Search & Replace URLs with the CDN URLs in the provided content
	 *
	 * @since 3.4
	 * @author Remy Perona
	 *
	 * @param string $html HTML content.
	 * @return string
	 */
	public function rewrite( $html ) {
		$pattern = '#[("\']\s*(?<url>(?:(?:https?:|)' . preg_quote( $this->get_base_url(), '#' ) . ')\/(?:(?:(?:' . $this->get_allowed_paths() . ')[^"\',)]+))|\/[^/](?:[^"\')\s>]+\.[^"\')\s>]+))\s*["\')]#i';
		return preg_replace_callback(
			$pattern,
			function( $matches ) {
				return str_replace( $matches['url'], $this->rewrite_url( $matches['url'] ), $matches[0] );
			},
			$html
		);
	}

/**
	 * Rewrites URLs in a srcset attribute using the CDN URL
	 *
	 * @since 3.4.0.4
	 * @author Remy Perona
	 *
	 * @param string $html HTML content.
	 * @return string
	 */
	public function rewrite_srcset( $html ) {
		$pattern = '#\s+(?:data-lazy-|data-)?srcset\s*=\s*["\']\s*(?<sources>[^"\',\s]+\.[^"\',\s]+(?:\s+\d+[wx])?(?:\s*,\s*[^"\',\s]+\.[^"\',\s]+\s+\d+[wx])*)\s*["\']#i';

if ( ! preg_match_all( $pattern, $html, $srcsets, PREG_SET_ORDER ) ) {
			return $html;
		}

foreach ( $srcsets as $srcset ) {
			$sources    = explode( ',', $srcset['sources'] );
			$cdn_srcset = $srcset['sources'];

foreach ( $sources as $source ) {
				$url        = \preg_split( '#\s+#', trim( $source ) );
				$cdn_srcset = str_replace( $url[0], $this->rewrite_url( $url[0] ), $cdn_srcset );
			}

$cdn_srcsets = str_replace( $srcset['sources'], $cdn_srcset, $srcset[0] );
			$html        = str_replace( $srcset[0], $cdn_srcsets, $html );
		}

return $html;
	}

/**
	 * Rewrites an URL with the CDN URL
	 *
	 * @since 3.4
	 * @author Remy Perona
	 *
	 * @param string $url Original URL.
	 * @return string
	 */
	public function rewrite_url( $url ) {
		if ( ! $this->options->get( 'cdn' ) ) {
			return $url;
		}

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

$cdn_urls = $this->get_cdn_urls( $this->get_zones_for_url( $url ) );

if ( ! $cdn_urls ) {
			return $url;
		}

$parsed_url = wp_parse_url( $url );
		$cdn_url    = untrailingslashit( $cdn_urls[ ( abs( crc32( $parsed_url['path'] ) ) % count( $cdn_urls ) ) ] );

if ( ! isset( $parsed_url['host'] ) ) {
			return rocket_add_url_protocol( $cdn_url . '/' . ltrim( $url, '/' ) );
		}

$home       = get_option( 'home' );
		$home_parts = wp_parse_url( $home );

if ( ! isset( $parsed_url['scheme'] ) ) {
			return str_replace( $home_parts['host'], rocket_remove_url_protocol( $cdn_url ), $url );
		}

$home_url = $home_parts['scheme'] . '://' . $home_parts['host'];

return str_replace( $home_url, rocket_add_url_protocol( $cdn_url ), $url );
	}

/**
	 * Rewrites URLs to CDN URLs in CSS content
	 *
	 * @since 3.4
	 * @author Remy Perona
	 *
	 * @param string $content CSS content.
	 * @return string
	 */
	public function rewrite_css_properties( $content ) {
		if ( ! preg_match_all( '#url$\s*(\'|")?\s*(?![\'"]?data)(?<url>(?:https?:|)' . preg_quote( $this->get_base_url(), '#' ) . '\/[^"|\'|$|\s]+)\s*#i', $content, $matches, PREG_SET_ORDER ) ) {
			return $content;
		}

foreach ( $matches as $property ) {
			/**
			 * Filters the URL of the CSS property
			 *
			 * @since 2.8
			 *
			 * @param string $url URL of the CSS property.
			 */
			$cdn_url     = $this->rewrite_url( apply_filters( 'rocket_cdn_css_properties_url', $property['url'] ) );
			$replacement = str_replace( $property['url'], $cdn_url, $property[0] );
			$content     = str_replace( $property[0], $replacement, $content );
		}

return $content;
	}

/**
	 * Get all CDN URLs for one or more zones.
	 *
	 * @since 2.1
	 * @since 3.0 Don't check for WP Rocket CDN option activated to be able to use the function on Hosting with CDN auto-enabled.
	 *
	 * @param  string $zones List of zones. Default is 'all'.
	 * @return array
	 */
	public function get_cdn_urls( $zones = 'all' ) {
		$hosts    = [];
		$zones    = (array) $zones;
		$cdn_urls = $this->options->get( 'cdn_cnames', [] );

if ( $cdn_urls ) {
			$cdn_zones = $this->options->get( 'cdn_zone', [] );

foreach ( $cdn_urls as $k => $urls ) {
				if ( ! in_array( $cdn_zones[ $k ], $zones, true ) ) {
					continue;
				}

$urls = explode( ',', $urls );
				$urls = array_map( 'trim', $urls );

foreach ( $urls as $url ) {
					$hosts[] = $url;
				}
			}
		}

/**
		 * Filter all CDN URLs.
		 *
		 * @since 2.7
		 * @since 3.4 Added $zone parameter.
		 *
		 * @param array $hosts List of CDN URLs.
		 * @param array $zones List of zones. Default is [ 'all' ].
		 */
		$hosts = (array) apply_filters( 'rocket_cdn_cnames', $hosts, $zones );
		$hosts = array_filter( $hosts );
		$hosts = array_flip( array_flip( $hosts ) );
		$hosts = array_values( $hosts );

return $hosts;
	}

/**
	 * Gets the base URL for the website
	 *
	 * @since 3.4
	 * @author Remy Perona
	 *
	 * @return string
	 */
	private function get_base_url() {
		return '//' . wp_parse_url( get_option( 'home' ), PHP_URL_HOST );
	}

/**
	 * Gets the allowed paths as a regex pattern for the CDN rewrite
	 *
	 * @since 3.4
	 * @author Remy Perona
	 *
	 * @return string
	 */
	private function get_allowed_paths() {
		$wp_content_dirname  = ltrim( trailingslashit( wp_parse_url( content_url(), PHP_URL_PATH ) ), '/' );
		$wp_includes_dirname = ltrim( trailingslashit( wp_parse_url( includes_url(), PHP_URL_PATH ) ), '/' );

$upload_dirname = '';
		$uploads_info   = wp_upload_dir();

if ( ! empty( $uploads_info['baseurl'] ) ) {
			$upload_dirname = '|' . ltrim( trailingslashit( wp_parse_url( $uploads_info['baseurl'], PHP_URL_PATH ) ), '/' );
		}

return $wp_content_dirname . $upload_dirname . '|' . $wp_includes_dirname;
	}

/**
	 * Checks if the provided URL can be rewritten with the CDN URL
	 *
	 * @since 3.4
	 * @author Remy Perona
	 *
	 * @param string $url URL to check.
	 * @return boolean
	 */
	public function is_excluded( $url ) {
		$path = wp_parse_url( $url, PHP_URL_PATH );

$excluded_extensions = [
			'php',
			'html',
			'htm',
		];

if ( in_array( pathinfo( $path, PATHINFO_EXTENSION ), $excluded_extensions, true ) ) {
			return true;
		}

if ( ! $path ) {
			return true;
		}

if ( '/' === $path ) {
			return true;
		}

if ( preg_match( '#^(' . $this->get_excluded_files( '#' ) . ')$#', $path ) ) {
			return true;
		}

return false;
	}

/**
	 * Gets the CDN zones for the provided URL
	 *
	 * @since 3.4
	 * @author Remy Perona
	 *
	 * @param string $url URL to check.
	 * @return array
	 */
	private function get_zones_for_url( $url ) {
		$zones = [ 'all' ];

$ext = pathinfo( wp_parse_url( $url, PHP_URL_PATH ), PATHINFO_EXTENSION );

$image_types = [
			'jpg',
			'jpeg',
			'jpe',
			'png',
			'gif',
			'webp',
			'bmp',
			'tiff',
			'svg',
		];

if ( 'css' === $ext || 'js' === $ext ) {
			$zones[] = 'css_and_js';
		}

if ( 'css' === $ext ) {
			$zones[] = 'css';
		}

if ( 'js' === $ext ) {
			$zones[] = 'js';
		}

if ( in_array( $ext, $image_types, true ) ) {
			$zones[] = 'images';
		}

return $zones;
	}

/**
	 * Get all files we don't allow to get in CDN.
	 *
	 * @since 2.5
	 *
	 * @param string $delimiter RegEx delimiter.
	 * @return string A pipe-separated list of excluded files.
	 */
	private function get_excluded_files( $delimiter ) {
		$files = $this->options->get( 'cdn_reject_files', [] );

/**
			* Filter the excluded files.
			*
			* @since 2.5
			*
			* @param array $files List of excluded files.
		*/
		$files = (array) apply_filters( 'rocket_cdn_reject_files', $files );
		$files = array_filter( $files );

if ( ! $files ) {
			return '';
		}

$files = array_flip( array_flip( $files ) );
		$files = array_map(
			function ( $file ) use ( $delimiter ) {
				return str_replace( $delimiter, '\\' . $delimiter, $file );
			},
			$files
		);

return implode( '|', $files );
	}
}

Editing: CDN.php

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