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