%PDF-
%PDF-
Mini Shell
Mini Shell
<?php
/**
* Loads images in WebP format or original images if browser does not support WebP.
*
* @category WordPress Plugin
* @package Converter for Media
* @author Mateusz Gbiorczyk
* @link https://wordpress.org/plugins/webp-converter-for-media/
*/
/**
* Loads lighter weight image files in output format instead of original formats.
*/
class PassthruLoader {
const PATH_UPLOADS = '';
const PATH_UPLOADS_WEBP = '';
const MIME_TYPES = '';
public function __construct() {
if ( ( self::PATH_UPLOADS === '' ) || ( self::PATH_UPLOADS_WEBP === '' ) || ( self::MIME_TYPES === '' ) ) {
http_response_code( 404 );
exit;
}
$image_url = $_GET['src'] ?? null; // phpcs:ignore WordPress.Security
if ( ! $image_url || ! $this->validate_src_param( $image_url ) ) {
return;
}
$this->load_converted_image( $image_url );
}
private function validate_src_param( string $image_url ): bool {
$url_path = parse_url( $image_url, PHP_URL_PATH ) ?: '';
$encoded_path = array_map( 'urlencode', explode( '/', $url_path ) );
$encoded_url = str_replace( $url_path, implode( '/', $encoded_path ), $image_url );
if ( filter_var( $encoded_url, FILTER_VALIDATE_URL ) === false ) {
return false;
}
$image_host = parse_url( $image_url, PHP_URL_HOST );
if ( $image_host !== ( $_SERVER['HTTP_HOST'] ?? '' ) ) { // phpcs:ignore WordPress.Security
return false;
}
$image_extension = strtolower( pathinfo( $image_url, PATHINFO_EXTENSION ) );
if ( ! in_array( $image_extension, [ 'jpg', 'jpeg', 'png', 'gif', 'png2' ] ) ) {
return false;
}
return true;
}
/**
* Initializes loading of image in supported output format.
*
* @param string $image_url URL of source image.
*
* @return void
*/
private function load_converted_image( string $image_url ) {
$mime_types = json_decode( self::MIME_TYPES, true ) ?: [];
$headers = array_change_key_case(
array_merge( ( function_exists( 'getallheaders' ) ) ? getallheaders() : [], $_SERVER ),
CASE_UPPER
);
$accept_header = $headers['ACCEPT'] ?? ( $headers['HTTP_ACCEPT'] ?? '' );
foreach ( $mime_types as $extension => $mime_type ) {
if ( ( strpos( $accept_header, $mime_type ) !== false )
&& ( $source = $this->load_image_source( $image_url, $extension ) ) ) {
header( 'Content-Type: ' . $mime_type );
echo $source; // phpcs:ignore
exit;
}
}
$this->load_image_default( $image_url );
}
/**
* Loads image output format.
*
* @param string $image_url URL of source image.
* @param string $extension Extension of output format.
*
* @return string|null Content of image in output format.
*/
private function load_image_source( string $image_url, string $extension ) {
$url = $this->generate_source_url( $image_url, $extension );
$ch = curl_init( $url );
if ( $ch === false ) {
return null;
}
curl_setopt( $ch, CURLOPT_SSL_VERIFYPEER, false );
curl_setopt( $ch, CURLOPT_SSL_VERIFYHOST, 0 );
curl_setopt( $ch, CURLOPT_RETURNTRANSFER, true );
$response = curl_exec( $ch );
$code = curl_getinfo( $ch, CURLINFO_HTTP_CODE );
curl_close( $ch );
if ( ( $code !== 200 ) || ! $response ) {
return null;
} else {
return ( is_string( $response ) ) ? $response : null;
}
}
/**
* Returns URL of output image by replacing URL of source image.
*
* @param string $image_url URL of source image.
* @param string $extension Extension of output format.
*
* @return string URL of image in output format.
*/
private function generate_source_url( string $image_url, string $extension ): string {
return sprintf(
'%1$s.%2$s',
str_replace( self::PATH_UPLOADS, self::PATH_UPLOADS_WEBP, $image_url ),
$extension
);
}
/**
* Redirects to source image.
*
* @param string $image_url URL of source image.
*
* @return void
*/
private function load_image_default( string $image_url ) {
header( 'Location: ' . $image_url );
}
}
new PassthruLoader();
Zerion Mini Shell 1.0