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