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383 lines
12 KiB
PHP
383 lines
12 KiB
PHP
<?php
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use Automattic\Jetpack\Status;
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/**
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* Generic functions using the Photon service.
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*
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* Some are used outside of the Photon module being active, so intentionally not within the module.
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*
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* @package jetpack
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*/
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/**
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* Generates a Photon URL.
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*
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* @see https://developer.wordpress.com/docs/photon/
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*
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* @param string $image_url URL to the publicly accessible image you want to manipulate.
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* @param array|string $args An array of arguments, i.e. array( 'w' => '300', 'resize' => array( 123, 456 ) ), or in string form (w=123&h=456).
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* @param string|null $scheme URL protocol.
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* @return string The raw final URL. You should run this through esc_url() before displaying it.
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*/
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function jetpack_photon_url( $image_url, $args = array(), $scheme = null ) {
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$image_url = trim( $image_url );
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if ( ! defined( 'IS_WPCOM' ) || ! IS_WPCOM ) {
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/**
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* Disables Photon URL processing for local development
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*
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* @module photon
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*
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* @since 4.1.0
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*
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* @param bool false Result of Automattic\Jetpack\Status->is_development_mode().
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*/
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if ( true === apply_filters( 'jetpack_photon_development_mode', ( new Status() )->is_development_mode() ) ) {
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return $image_url;
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}
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}
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/**
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* Allow specific image URls to avoid going through Photon.
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*
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* @module photon
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*
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* @since 3.2.0
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*
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* @param bool false Should the image be returned as is, without going through Photon. Default to false.
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* @param string $image_url Image URL.
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* @param array|string $args Array of Photon arguments.
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* @param string|null $scheme Image scheme. Default to null.
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*/
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if ( false !== apply_filters( 'jetpack_photon_skip_for_url', false, $image_url, $args, $scheme ) ) {
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return $image_url;
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}
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/**
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* Filter the original image URL before it goes through Photon.
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*
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* @module photon
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*
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* @since 1.9.0
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*
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* @param string $image_url Image URL.
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* @param array|string $args Array of Photon arguments.
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* @param string|null $scheme Image scheme. Default to null.
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*/
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$image_url = apply_filters( 'jetpack_photon_pre_image_url', $image_url, $args, $scheme );
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/**
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* Filter the original Photon image parameters before Photon is applied to an image.
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*
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* @module photon
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*
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* @since 1.9.0
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*
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* @param array|string $args Array of Photon arguments.
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* @param string $image_url Image URL.
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* @param string|null $scheme Image scheme. Default to null.
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*/
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$args = apply_filters( 'jetpack_photon_pre_args', $args, $image_url, $scheme );
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if ( empty( $image_url ) ) {
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return $image_url;
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}
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$image_url_parts = wp_parse_url( $image_url );
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// Unable to parse.
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if ( ! is_array( $image_url_parts ) || empty( $image_url_parts['host'] ) || empty( $image_url_parts['path'] ) ) {
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return $image_url;
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}
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if ( is_array( $args ) ) {
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// Convert values that are arrays into strings.
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foreach ( $args as $arg => $value ) {
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if ( is_array( $value ) ) {
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$args[ $arg ] = implode( ',', $value );
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}
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}
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// Encode values.
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// See https://core.trac.wordpress.org/ticket/17923 .
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$args = rawurlencode_deep( $args );
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}
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// Don't photon-ize WPCOM hosted images -- we can serve them up from wpcom directly.
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$is_wpcom_image = false;
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if ( wp_endswith( strtolower( $image_url_parts['host'] ), '.files.wordpress.com' ) ) {
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$is_wpcom_image = true;
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if ( isset( $args['ssl'] ) ) {
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// Do not send the ssl argument to prevent caching issues.
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unset( $args['ssl'] );
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}
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}
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/** This filter is documented below. */
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$custom_photon_url = apply_filters( 'jetpack_photon_domain', '', $image_url );
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$custom_photon_url = esc_url( $custom_photon_url );
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// You can't run a Photon URL through Photon again because query strings are stripped.
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// So if the image is already a Photon URL, append the new arguments to the existing URL.
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// Alternately, if it's a *.files.wordpress.com url, then keep the domain as is.
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if (
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in_array( $image_url_parts['host'], array( 'i0.wp.com', 'i1.wp.com', 'i2.wp.com' ), true )
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|| wp_parse_url( $custom_photon_url, PHP_URL_HOST ) === $image_url_parts['host']
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|| $is_wpcom_image
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) {
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/*
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* VideoPress Poster images should only keep one param, ssl.
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*/
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if (
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is_array( $args )
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&& 'videos.files.wordpress.com' === strtolower( $image_url_parts['host'] )
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) {
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$args = array_intersect_key( array( 'ssl' => 1 ), $args );
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}
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$photon_url = add_query_arg( $args, $image_url );
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return jetpack_photon_url_scheme( $photon_url, $scheme );
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}
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/**
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* Allow Photon to use query strings as well.
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* By default, Photon doesn't support query strings so we ignore them and look only at the path.
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* This setting is Photon Server dependent.
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*
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* @module photon
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*
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* @since 1.9.0
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*
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* @param bool false Should images using query strings go through Photon. Default is false.
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* @param string $image_url_parts['host'] Image URL's host.
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*/
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if ( ! apply_filters( 'jetpack_photon_any_extension_for_domain', false, $image_url_parts['host'] ) ) {
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// Photon doesn't support query strings so we ignore them and look only at the path.
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// However some source images are served via PHP so check the no-query-string extension.
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// For future proofing, this is a blacklist of common issues rather than a whitelist.
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$extension = pathinfo( $image_url_parts['path'], PATHINFO_EXTENSION );
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if ( empty( $extension ) || in_array( $extension, array( 'php', 'ashx' ), true ) ) {
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return $image_url;
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}
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}
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$image_host_path = $image_url_parts['host'] . $image_url_parts['path'];
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/*
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* Figure out which CDN subdomain to use.
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*
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* The goal is to have the same subdomain for any particular image to prevent multiple runs resulting in multiple
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* images needing to be downloaded by the browser.
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*
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* We are providing our own generated value by taking the modulus of the crc32 value of the URL.
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*
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* Valid values are 0, 1, and 2.
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*/
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$subdomain = abs( crc32( $image_host_path ) % 3 );
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/**
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* Filters the domain used by the Photon module.
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*
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* @module photon
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*
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* @since 3.4.2
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*
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* @param string https://i{$subdomain}.wp.com Domain used by Photon. $subdomain is a random number between 0 and 2.
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* @param string $image_url URL of the image to be photonized.
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*/
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$photon_domain = apply_filters( 'jetpack_photon_domain', "https://i{$subdomain}.wp.com", $image_url );
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$photon_domain = trailingslashit( esc_url( $photon_domain ) );
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$photon_url = $photon_domain . $image_host_path;
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/**
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* Add query strings to Photon URL.
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* By default, Photon doesn't support query strings so we ignore them.
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* This setting is Photon Server dependent.
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*
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* @module photon
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*
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* @since 1.9.0
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*
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* @param bool false Should query strings be added to the image URL. Default is false.
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* @param string $image_url_parts['host'] Image URL's host.
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*/
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if ( isset( $image_url_parts['query'] ) && apply_filters( 'jetpack_photon_add_query_string_to_domain', false, $image_url_parts['host'] ) ) {
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$photon_url .= '?q=' . rawurlencode( $image_url_parts['query'] );
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}
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if ( $args ) {
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if ( is_array( $args ) ) {
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$photon_url = add_query_arg( $args, $photon_url );
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} else {
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// You can pass a query string for complicated requests but where you still want CDN subdomain help, etc.
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$photon_url .= '?' . $args;
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}
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}
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if ( isset( $image_url_parts['scheme'] ) && 'https' === $image_url_parts['scheme'] ) {
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$photon_url = add_query_arg( array( 'ssl' => 1 ), $photon_url );
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}
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return jetpack_photon_url_scheme( $photon_url, $scheme );
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}
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/**
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* Add an easy way to photon-ize a URL that is safe to call even if Jetpack isn't active.
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*
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* See: https://jetpack.com/2013/07/11/photon-and-themes/
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*/
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add_filter( 'jetpack_photon_url', 'jetpack_photon_url', 10, 3 );
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/**
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* WordPress.com
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*
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* If a cropped WP.com-hosted image is the source image, have Photon replicate the crop.
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*/
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add_filter( 'jetpack_photon_pre_args', 'jetpack_photon_parse_wpcom_query_args', 10, 2 );
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/**
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* Parses WP.com-hosted image args to replicate the crop.
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*
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* @param mixed $args Args set during Photon's processing.
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* @param string $image_url URL of the image.
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* @return array|string Args for Photon to use for the URL.
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*/
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function jetpack_photon_parse_wpcom_query_args( $args, $image_url ) {
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$parsed_url = wp_parse_url( $image_url );
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if ( ! $parsed_url ) {
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return $args;
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}
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$image_url_parts = wp_parse_args(
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$parsed_url,
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array(
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'host' => '',
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'query' => '',
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)
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);
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if ( '.files.wordpress.com' !== substr( $image_url_parts['host'], -20 ) ) {
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return $args;
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}
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if ( empty( $image_url_parts['query'] ) ) {
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return $args;
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}
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$wpcom_args = wp_parse_args( $image_url_parts['query'] );
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if ( empty( $wpcom_args['w'] ) || empty( $wpcom_args['h'] ) ) {
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return $args;
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}
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// Keep the crop by using "resize".
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if ( ! empty( $wpcom_args['crop'] ) ) {
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if ( is_array( $args ) ) {
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$args = array_merge( array( 'resize' => array( $wpcom_args['w'], $wpcom_args['h'] ) ), $args );
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} else {
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$args = 'resize=' . rawurlencode( absint( $wpcom_args['w'] ) . ',' . absint( $wpcom_args['h'] ) ) . '&' . $args;
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}
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} else {
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if ( is_array( $args ) ) {
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$args = array_merge( array( 'fit' => array( $wpcom_args['w'], $wpcom_args['h'] ) ), $args );
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} else {
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$args = 'fit=' . rawurlencode( absint( $wpcom_args['w'] ) . ',' . absint( $wpcom_args['h'] ) ) . '&' . $args;
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}
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}
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return $args;
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}
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/**
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* Sets the scheme for a URL
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*
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* @param string $url URL to set scheme.
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* @param string $scheme Scheme to use. Accepts http, https, network_path.
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*
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* @return string URL.
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*/
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function jetpack_photon_url_scheme( $url, $scheme ) {
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if ( ! in_array( $scheme, array( 'http', 'https', 'network_path' ), true ) ) {
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if ( preg_match( '#^(https?:)?//#', $url ) ) {
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return $url;
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}
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$scheme = 'http';
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}
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if ( 'network_path' === $scheme ) {
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$scheme_slashes = '//';
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} else {
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$scheme_slashes = "$scheme://";
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}
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return preg_replace( '#^([a-z:]+)?//#i', $scheme_slashes, $url );
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}
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/**
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* A wrapper for PHP's parse_url, prepending assumed scheme for network path
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* URLs. PHP versions 5.4.6 and earlier do not correctly parse without scheme.
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*
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* WP ships with a wrapper for parse_url, wp_parse_url, that should be used instead.
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*
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* @see https://php.net/manual/en/function.parse-url.php#refsect1-function.parse-url-changelog
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* @deprecated 7.8.0 Use wp_parse_url instead.
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*
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* @param string $url The URL to parse.
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* @param integer $component Retrieve specific URL component.
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* @return mixed Result of parse_url
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*/
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function jetpack_photon_parse_url( $url, $component = -1 ) {
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_deprecated_function( 'jetpack_photon_parse_url', 'jetpack-7.8.0', 'wp_parse_url' );
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return wp_parse_url( $url, $component );
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}
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add_filter( 'jetpack_photon_skip_for_url', 'jetpack_photon_banned_domains', 9, 2 );
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/**
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* Check to skip Photon for a known domain that shouldn't be Photonized.
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*
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* @param bool $skip If the image should be skipped by Photon.
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* @param string $image_url URL of the image.
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*
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* @return bool Should the image be skipped by Photon.
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*/
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function jetpack_photon_banned_domains( $skip, $image_url ) {
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$banned_host_patterns = array(
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'/^chart\.googleapis\.com$/',
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'/^chart\.apis\.google\.com$/',
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'/^graph\.facebook\.com$/',
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'/\.fbcdn\.net$/',
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'/\.paypalobjects\.com$/',
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'/\.dropbox\.com$/',
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'/\.cdninstagram\.com$/',
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);
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$host = wp_parse_url( $image_url, PHP_URL_HOST );
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foreach ( $banned_host_patterns as $banned_host_pattern ) {
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if ( 1 === preg_match( $banned_host_pattern, $host ) ) {
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return true;
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}
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}
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return $skip;
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}
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/**
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* Jetpack Photon - Support Text Widgets.
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*
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* @access public
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* @param string $content Content from text widget.
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* @return string
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*/
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function jetpack_photon_support_text_widgets( $content ) {
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if ( class_exists( 'Jetpack_Photon' ) && Jetpack::is_module_active( 'photon' ) ) {
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return Jetpack_Photon::filter_the_content( $content );
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}
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return $content;
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}
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add_filter( 'widget_text', 'jetpack_photon_support_text_widgets' );
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