jetpack.php
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<?php
/**
* Adds support to Jetpack's Site Accelerator (Photon)
*
* @since 2.2.0
* @package Stackable
*/
// Exit if accessed directly.
if ( ! defined( 'ABSPATH' ) ) {
exit;
}
// Only when Jetpack's Photon is enabled.
if ( function_exists( 'jetpack_photon_url' ) ) {
if ( ! function_exists( 'stackable_jetpack_photon_render_block_replace_style_images' ) ) {
/**
* Replace the url with a Photon url.
*
* @param array $matches Matches returned by preg_replace_callback. These are urls.
*
* @return string The replacement string.
*/
function stackable_jetpack_photon_render_block_replace_style_images( $matches ) {
return jetpack_photon_url( $matches[0] );
}
}
if ( ! function_exists( 'stackable_jetpack_photon_render_block_replace_style' ) ) {
/**
* Find all the image urls that needs ot be replaced with CDN urls.
*
* @param array $matches Matches returned by preg_replace_callback.
*
* @return string The replacement string.
*/
function stackable_jetpack_photon_render_block_replace_style( $matches ) {
return preg_replace_callback( '/https?:[^;\}<]+.(jpg|gif|png)/i', 'stackable_jetpack_photon_render_block_replace_style_images', $matches[0] );
}
}
if ( ! function_exists( 'stackable_jetpack_photon_render_block' ) ) {
/**
* Replaces all image urls inside style tags into CDN tags.
*
* @param string $block_content The block output.
* @param array $block The block object being rendered.
*
* @return string The modified block output.
*/
function stackable_jetpack_photon_render_block( $block_content, $block ) {
if ( $block_content === null ) {
return $block_content;
}
// Only for Stackable blocks.
$block_name = isset( $block['blockName'] ) ? $block['blockName'] : '';
if ( strpos( $block_name, 'ugb/', 0 ) === false ) {
return $block_content;
}
// Just a quick check: Only change if there're images found in the style tag.
if ( ! preg_match( '/<style(.*?)http\s?:(.*?).(jpg|png|gif)(.*?)<\/style/', $block_content ) ) {
return $block_content;
}
// Replace photon images inside style tags.
return preg_replace_callback( '/<style(.*?)<\/style/', 'stackable_jetpack_photon_render_block_replace_style', $block_content );
}
add_filter( 'render_block', 'stackable_jetpack_photon_render_block', 10, 2 );
}
}