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<?php // phpcs:ignore WordPress.Files.FileName.InvalidClassFileName
/**
* Class for photon functionality.
*
* @package Jetpack.
*/
use Automattic\Jetpack\Assets;
/**
* Class Jetpack_Photon
*/
class Jetpack_Photon {
/**
* Singleton.
*
* @var null
*/
private static $instance = null;
/**
* Allowed extensions.
*
* @var string[] Allowed extensions must match https://code.trac.wordpress.org/browser/photon/index.php#L31
*/
protected static $extensions = array(
'gif',
'jpg',
'jpeg',
'png',
);
/**
* Image sizes.
*
* Don't access this directly. Instead, use self::image_sizes() so it's actually populated with something.
*
* @var array Image sizes.
*/
protected static $image_sizes = null;
/**
* Singleton implementation
*
* @return object
*/
public static function instance() {
if ( ! is_a( self::$instance, 'Jetpack_Photon' ) ) {
self::$instance = new Jetpack_Photon();
self::$instance->setup();
}
return self::$instance;
}
/**
* Silence is golden.
*/
private function __construct() {}
/**
* Register actions and filters, but only if basic Photon functions are available.
* The basic functions are found in ./functions.photon.php.
*
* @uses add_action, add_filter
* @return null
*/
private function setup() {
if ( ! function_exists( 'jetpack_photon_url' ) ) {
return;
}
// Images in post content and galleries.
add_filter( 'the_content', array( __CLASS__, 'filter_the_content' ), 999999 );
add_filter( 'get_post_galleries', array( __CLASS__, 'filter_the_galleries' ), 999999 );
add_filter( 'widget_media_image_instance', array( __CLASS__, 'filter_the_image_widget' ), 999999 );
// Core image retrieval.
add_filter( 'image_downsize', array( $this, 'filter_image_downsize' ), 10, 3 );
add_filter( 'rest_request_before_callbacks', array( $this, 'should_rest_photon_image_downsize' ), 10, 3 );
add_action( 'rest_after_insert_attachment', array( $this, 'should_rest_photon_image_downsize_insert_attachment' ), 10, 2 );
add_filter( 'rest_request_after_callbacks', array( $this, 'cleanup_rest_photon_image_downsize' ) );
// Responsive image srcset substitution.
add_filter( 'wp_calculate_image_srcset', array( $this, 'filter_srcset_array' ), 10, 5 );
add_filter( 'wp_calculate_image_sizes', array( $this, 'filter_sizes' ), 1, 2 ); // Early so themes can still easily filter.
// Helpers for maniuplated images.
add_action( 'wp_enqueue_scripts', array( $this, 'action_wp_enqueue_scripts' ), 9 );
/**
* Allow Photon to disable uploaded images resizing and use its own resize capabilities instead.
*
* @module photon
*
* @since 7.1.0
*
* @param bool false Should Photon enable noresize mode. Default to false.
*/
if ( apply_filters( 'jetpack_photon_noresize_mode', false ) ) {
$this->enable_noresize_mode();
}
}
/**
* Enables the noresize mode for Photon, allowing to avoid intermediate size files generation.
*/
private function enable_noresize_mode() {
jetpack_require_lib( 'class.jetpack-photon-image-sizes' );
// The main objective of noresize mode is to disable additional resized image versions creation.
// This filter handles removal of additional sizes.
add_filter( 'intermediate_image_sizes_advanced', array( __CLASS__, 'filter_photon_noresize_intermediate_sizes' ) );
// Load the noresize srcset solution on priority of 20, allowing other plugins to set sizes earlier.
add_filter( 'wp_get_attachment_metadata', array( __CLASS__, 'filter_photon_norezise_maybe_inject_sizes' ), 20, 2 );
// Photonize thumbnail URLs in the API response.
add_filter( 'rest_api_thumbnail_size_urls', array( __CLASS__, 'filter_photon_noresize_thumbnail_urls' ) );
// This allows to assign the Photon domain to images that normally use the home URL as base.
add_filter( 'jetpack_photon_domain', array( __CLASS__, 'filter_photon_norezise_domain' ), 10, 2 );
add_filter( 'the_content', array( __CLASS__, 'filter_content_add' ), 0 );
// Jetpack hooks in at six nines (999999) so this filter does at seven.
add_filter( 'the_content', array( __CLASS__, 'filter_content_remove' ), 9999999 );
// Regular Photon operation mode filter doesn't run when is_admin(), so we need an additional filter.
// This is temporary until Jetpack allows more easily running these filters for is_admin().
if ( is_admin() ) {
add_filter( 'image_downsize', array( $this, 'filter_image_downsize' ), 5, 3 );
// Allows any image that gets passed to Photon to be resized via Photon.
add_filter( 'jetpack_photon_admin_allow_image_downsize', '__return_true' );
}
}
/**
* This is our catch-all to strip dimensions from intermediate images in content.
* Since this primarily only impacts post_content we do a little dance to add the filter early
* to `the_content` and then remove it later on in the same hook.
*
* @param String $content the post content.
* @return String the post content unchanged.
*/
public static function filter_content_add( $content ) {
add_filter( 'jetpack_photon_pre_image_url', array( __CLASS__, 'strip_image_dimensions_maybe' ) );
return $content;
}
/**
* Removing the content filter that was set previously.
*
* @param String $content the post content.
* @return String the post content unchanged.
*/
public static function filter_content_remove( $content ) {
remove_filter( 'jetpack_photon_pre_image_url', array( __CLASS__, 'strip_image_dimensions_maybe' ) );
return $content;
}
/**
* Short circuits the Photon filter to enable Photon processing for any URL.
*
* @param String $photon_url a proposed Photon URL for the media file.
*
* @return String an URL to be used for the media file.
*/
public static function filter_photon_norezise_domain( $photon_url ) {
return $photon_url;
}
/**
* Disables intermediate sizes to disallow resizing.
*
* @return array Empty array.
*/
public static function filter_photon_noresize_intermediate_sizes() {
return array();
}
/**
* Filter thumbnail URLS to not generate.
*
* @param array $sizes Image sizes.
*
* @return mixed
*/
public static function filter_photon_noresize_thumbnail_urls( $sizes ) {
foreach ( $sizes as $size => $url ) {
$parts = explode( '?', $url );
$arguments = isset( $parts[1] ) ? $parts[1] : array();
$sizes[ $size ] = jetpack_photon_url( $url, wp_parse_args( $arguments ) );
}
return $sizes;
}
/**
* Inject image sizes to attachment metadata.
*
* @param array $data Attachment metadata.
* @param int $attachment_id Attachment's post ID.
*
* @return array Attachment metadata.
*/
public static function filter_photon_norezise_maybe_inject_sizes( $data, $attachment_id ) {
// Can't do much if data is empty.
if ( empty( $data ) ) {
return $data;
}
$sizes_already_exist = (
true === is_array( $data )
&& true === array_key_exists( 'sizes', $data )
&& true === is_array( $data['sizes'] )
&& false === empty( $data['sizes'] )
);
if ( $sizes_already_exist ) {
return $data;
}
// Missing some critical data we need to determine sizes, not processing.
if ( ! isset( $data['file'] )
|| ! isset( $data['width'] )
|| ! isset( $data['height'] )
) {
return $data;
}
$mime_type = get_post_mime_type( $attachment_id );
$attachment_is_image = preg_match( '!^image/!', $mime_type );
if ( 1 === $attachment_is_image ) {
$image_sizes = new Jetpack_Photon_ImageSizes( $attachment_id, $data );
$data['sizes'] = $image_sizes->generate_sizes_meta();
}
return $data;
}
/**
* Inject image sizes to Jetpack REST API responses. This wraps the filter_photon_norezise_maybe_inject_sizes function.
*
* @param array $sizes Attachment sizes data.
* @param int $attachment_id Attachment's post ID.
*
* @return array Attachment sizes array.
*/
public static function filter_photon_norezise_maybe_inject_sizes_api( $sizes, $attachment_id ) {
return self::filter_photon_norezise_maybe_inject_sizes( wp_get_attachment_metadata( $attachment_id ), $attachment_id );
}
/**
* * IN-CONTENT IMAGE MANIPULATION FUNCTIONS
**/
/**
* Match all images and any relevant <a> tags in a block of HTML.
*
* @param string $content Some HTML.
* @return array An array of $images matches, where $images[0] is
* an array of full matches, and the link_url, img_tag,
* and img_url keys are arrays of those matches.
*/
public static function parse_images_from_html( $content ) {
$images = array();
if ( preg_match_all( '#(?:<a[^>]+?href=["|\'](?P<link_url>[^\s]+?)["|\'][^>]*?>\s*)?(?P<img_tag><(?:img|amp-img|amp-anim)[^>]*?\s+?src=["|\'](?P<img_url>[^\s]+?)["|\'].*?>){1}(?:\s*</a>)?#is', $content, $images ) ) {
foreach ( $images as $key => $unused ) {
// Simplify the output as much as possible, mostly for confirming test results.
if ( is_numeric( $key ) && $key > 0 ) {
unset( $images[ $key ] );
}
}
return $images;
}
return array();
}
/**
* Try to determine height and width from strings WP appends to resized image filenames.
*
* @param string $src The image URL.
* @return array An array consisting of width and height.
*/
public static function parse_dimensions_from_filename( $src ) {
$width_height_string = array();
if ( preg_match( '#-(\d+)x(\d+)\.(?:' . implode( '|', self::$extensions ) . '){1}$#i', $src, $width_height_string ) ) {
$width = (int) $width_height_string[1];
$height = (int) $width_height_string[2];
if ( $width && $height ) {
return array( $width, $height );
}
}
return array( false, false );
}
/**
* Identify images in post content, and if images are local (uploaded to the current site), pass through Photon.
*
* @param string $content The content.
*
* @uses self::validate_image_url, apply_filters, jetpack_photon_url, esc_url
* @filter the_content
*
* @return string
*/
public static function filter_the_content( $content ) {
$images = self::parse_images_from_html( $content );
if ( ! empty( $images ) ) {
$content_width = Jetpack::get_content_width();
$image_sizes = self::image_sizes();
$upload_dir = wp_get_upload_dir();
foreach ( $images[0] as $index => $tag ) {
// Default to resize, though fit may be used in certain cases where a dimension cannot be ascertained.
$transform = 'resize';
// Start with a clean attachment ID each time.
$attachment_id = false;
// Flag if we need to munge a fullsize URL.
$fullsize_url = false;
// Identify image source.
$src_orig = $images['img_url'][ $index ];
$src = $src_orig;
/**
* Allow specific images to be skipped by Photon.
*
* @module photon
*
* @since 2.0.3
*
* @param bool false Should Photon ignore this image. Default to false.
* @param string $src Image URL.
* @param string $tag Image Tag (Image HTML output).
*/
if ( apply_filters( 'jetpack_photon_skip_image', false, $src, $tag ) ) {
continue;
}
// Support Automattic's Lazy Load plugin.
// Can't modify $tag yet as we need unadulterated version later.
if ( preg_match( '#data-lazy-src=["|\'](.+?)["|\']#i', $images['img_tag'][ $index ], $lazy_load_src ) ) {
$placeholder_src_orig = $src;
$placeholder_src = $placeholder_src_orig;
$src_orig = $lazy_load_src[1];
$src = $src_orig;
} elseif ( preg_match( '#data-lazy-original=["|\'](.+?)["|\']#i', $images['img_tag'][ $index ], $lazy_load_src ) ) {
$placeholder_src_orig = $src;
$placeholder_src = $placeholder_src_orig;
$src_orig = $lazy_load_src[1];
$src = $src_orig;
}
// Check if image URL should be used with Photon.
if ( self::validate_image_url( $src ) ) {
// Find the width and height attributes.
$width = false;
$height = false;
// First, check the image tag. Note we only check for pixel sizes now; HTML4 percentages have never been correctly
// supported, so we stopped pretending to support them in JP 9.1.0.
if ( preg_match( '#[\s|"|\']width=["|\']?([\d%]+)["|\']?#i', $images['img_tag'][ $index ], $width_string ) ) {
$width = false === strpos( $width_string[1], '%' ) ? $width_string[1] : false;
}
if ( preg_match( '#[\s|"|\']height=["|\']?([\d%]+)["|\']?#i', $images['img_tag'][ $index ], $height_string ) ) {
$height = false === strpos( $height_string[1], '%' ) ? $height_string[1] : false;
}
// Detect WP registered image size from HTML class.
if ( preg_match( '#class=["|\']?[^"\']*size-([^"\'\s]+)[^"\']*["|\']?#i', $images['img_tag'][ $index ], $size ) ) {
$size = array_pop( $size );
if ( false === $width && false === $height && 'full' !== $size && array_key_exists( $size, $image_sizes ) ) {
$width = (int) $image_sizes[ $size ]['width'];
$height = (int) $image_sizes[ $size ]['height'];
$transform = $image_sizes[ $size ]['crop'] ? 'resize' : 'fit';
}
} else {
unset( $size );
}
// WP Attachment ID, if uploaded to this site.
if (
preg_match( '#class=["|\']?[^"\']*wp-image-([\d]+)[^"\']*["|\']?#i', $images['img_tag'][ $index ], $attachment_id ) &&
0 === strpos( $src, $upload_dir['baseurl'] ) &&
/**
* Filter whether an image using an attachment ID in its class has to be uploaded to the local site to go through Photon.
*
* @module photon
*
* @since 2.0.3
*
* @param bool false Was the image uploaded to the local site. Default to false.
* @param array $args {
* Array of image details.
*
* @type $src Image URL.
* @type tag Image tag (Image HTML output).
* @type $images Array of information about the image.
* @type $index Image index.
* }
*/
apply_filters( 'jetpack_photon_image_is_local', false, compact( 'src', 'tag', 'images', 'index' ) )
) {
$attachment_id = (int) array_pop( $attachment_id );
if ( $attachment_id ) {
$attachment = get_post( $attachment_id );
// Basic check on returned post object.
if ( is_object( $attachment ) && ! is_wp_error( $attachment ) && 'attachment' === $attachment->post_type ) {
$src_per_wp = wp_get_attachment_image_src( $attachment_id, isset( $size ) ? $size : 'full' );
if ( self::validate_image_url( $src_per_wp[0] ) ) {
$src = $src_per_wp[0];
$fullsize_url = true;
// Prevent image distortion if a detected dimension exceeds the image's natural dimensions.
if ( ( false !== $width && $width > $src_per_wp[1] ) || ( false !== $height && $height > $src_per_wp[2] ) ) {
$width = false === $width ? false : min( $width, $src_per_wp[1] );
$height = false === $height ? false : min( $height, $src_per_wp[2] );
}
// If no width and height are found, max out at source image's natural dimensions.
// Otherwise, respect registered image sizes' cropping setting.
if ( false === $width && false === $height ) {
$width = $src_per_wp[1];
$height = $src_per_wp[2];
$transform = 'fit';
} elseif ( isset( $size ) && array_key_exists( $size, $image_sizes ) && isset( $image_sizes[ $size ]['crop'] ) ) {
$transform = (bool) $image_sizes[ $size ]['crop'] ? 'resize' : 'fit';
}
}
} else {
unset( $attachment_id );
unset( $attachment );
}
}
}
// If image tag lacks width and height arguments, try to determine from strings WP appends to resized image filenames.
if ( false === $width && false === $height ) {
list( $width, $height ) = self::parse_dimensions_from_filename( $src );
}
$width_orig = $width;
$height_orig = $height;
$transform_orig = $transform;
// If width is available, constrain to $content_width.
if ( false !== $width && is_numeric( $content_width ) && $width > $content_width ) {
if ( false !== $height ) {
$height = round( ( $content_width * $height ) / $width );
}
$width = $content_width;
}
// Set a width if none is found and $content_width is available.
// If width is set in this manner and height is available, use `fit` instead of `resize` to prevent skewing.
if ( false === $width && is_numeric( $content_width ) ) {
$width = (int) $content_width;
if ( false !== $height ) {
$transform = 'fit';
}
}
// Detect if image source is for a custom-cropped thumbnail and prevent further URL manipulation.
if ( ! $fullsize_url && preg_match_all( '#-e[a-z0-9]+(-\d+x\d+)?\.(' . implode( '|', self::$extensions ) . '){1}$#i', basename( $src ), $filename ) ) {
$fullsize_url = true;
}
// Build URL, first maybe removing WP's resized string so we pass the original image to Photon.
if ( ! $fullsize_url && 0 === strpos( $src, $upload_dir['baseurl'] ) ) {
$src = self::strip_image_dimensions_maybe( $src );
}
// Build array of Photon args and expose to filter before passing to Photon URL function.
$args = array();
if ( false !== $width && false !== $height ) {
$args[ $transform ] = $width . ',' . $height;
} elseif ( false !== $width ) {
$args['w'] = $width;
} elseif ( false !== $height ) {
$args['h'] = $height;
}
/**
* Filter the array of Photon arguments added to an image when it goes through Photon.
* By default, only includes width and height values.
*
* @see https://developer.wordpress.com/docs/photon/api/
*
* @module photon
*
* @since 2.0.0
*
* @param array $args Array of Photon Arguments.
* @param array $details {
* Array of image details.
*
* @type string $tag Image tag (Image HTML output).
* @type string $src Image URL.
* @type string $src_orig Original Image URL.
* @type int|false $width Image width.
* @type int|false $height Image height.
* @type int|false $width_orig Original image width before constrained by content_width.
* @type int|false $height_orig Original Image height before constrained by content_width.
* @type string $transform Transform.
* @type string $transform_orig Original transform before constrained by content_width.
* }
*/
$args = apply_filters( 'jetpack_photon_post_image_args', $args, compact( 'tag', 'src', 'src_orig', 'width', 'height', 'width_orig', 'height_orig', 'transform', 'transform_orig' ) );
$photon_url = jetpack_photon_url( $src, $args );
// Modify image tag if Photon function provides a URL
// Ensure changes are only applied to the current image by copying and modifying the matched tag, then replacing the entire tag with our modified version.
if ( $src !== $photon_url ) {
$new_tag = $tag;
// If present, replace the link href with a Photoned URL for the full-size image.
if ( ! empty( $images['link_url'][ $index ] ) && self::validate_image_url( $images['link_url'][ $index ] ) ) {
$new_tag = preg_replace( '#(href=["|\'])' . preg_quote( $images['link_url'][ $index ], '#' ) . '(["|\'])#i', '\1' . jetpack_photon_url( $images['link_url'][ $index ] ) . '\2', $new_tag, 1 );
}
// Supplant the original source value with our Photon URL.
$photon_url = esc_url( $photon_url );
$new_tag = str_replace( $src_orig, $photon_url, $new_tag );
// If Lazy Load is in use, pass placeholder image through Photon.
if ( isset( $placeholder_src ) && self::validate_image_url( $placeholder_src ) ) {
$placeholder_src = jetpack_photon_url( $placeholder_src );
if ( $placeholder_src !== $placeholder_src_orig ) {
$new_tag = str_replace( $placeholder_src_orig, esc_url( $placeholder_src ), $new_tag );
}
unset( $placeholder_src );
}
// If we are not transforming the image with resize, fit, or letterbox (lb), then we should remove
// the width and height arguments (including HTML4 percentages) from the image to prevent distortion.
// Even if $args['w'] and $args['h'] are present, Photon does not crop to those dimensions. Instead,
// it appears to favor height.
//
// If we are transforming the image via one of those methods, let's update the width and height attributes.
if ( empty( $args['resize'] ) && empty( $args['fit'] ) && empty( $args['lb'] ) ) {
$new_tag = preg_replace( '#(?<=\s)(width|height)=["|\']?[\d%]+["|\']?\s?#i', '', $new_tag );
} else {
$resize_args = isset( $args['resize'] ) ? $args['resize'] : false;
if ( false === $resize_args ) {
$resize_args = ( ! $resize_args && isset( $args['fit'] ) )
? $args['fit']
: false;
}
if ( false === $resize_args ) {
$resize_args = ( ! $resize_args && isset( $args['lb'] ) )
? $args['lb']
: false;
}
$resize_args = array_map( 'trim', explode( ',', $resize_args ) );
// (?<=\s) - Ensure width or height attribute is preceded by a space
// (width=["|\']?) - Matches, and captures, width=, width=", or width='
// [\d%]+ - Matches 1 or more digits or percent signs
// (["|\']?) - Matches, and captures, ", ', or empty string
// \s - Ensures there's a space after the attribute
$new_tag = preg_replace( '#(?<=\s)(width=["|\']?)[\d%]+(["|\']?)\s?#i', sprintf( '${1}%d${2} ', $resize_args[0] ), $new_tag );
$new_tag = preg_replace( '#(?<=\s)(height=["|\']?)[\d%]+(["|\']?)\s?#i', sprintf( '${1}%d${2} ', $resize_args[1] ), $new_tag );
}
// Tag an image for dimension checking.
if ( ! self::is_amp_endpoint() ) {
$new_tag = preg_replace( '#(\s?/)?>(\s*</a>)?$#i', ' data-recalc-dims="1"\1>\2', $new_tag );
}
// Replace original tag with modified version.
$content = str_replace( $tag, $new_tag, $content );
}
} elseif ( preg_match( '#^http(s)?://i[\d]{1}.wp.com#', $src ) && ! empty( $images['link_url'][ $index ] ) && self::validate_image_url( $images['link_url'][ $index ] ) ) {
$new_tag = preg_replace( '#(href=["|\'])' . preg_quote( $images['link_url'][ $index ], '#' ) . '(["|\'])#i', '\1' . jetpack_photon_url( $images['link_url'][ $index ] ) . '\2', $tag, 1 );
$content = str_replace( $tag, $new_tag, $content );
}
}
}
return $content;
}
/**
* Filter Core galleries
*
* @param array $galleries Gallery array.
*
* @return array
*/
public static function filter_the_galleries( $galleries ) {
if ( empty( $galleries ) || ! is_array( $galleries ) ) {
return $galleries;
}
// Pass by reference, so we can modify them in place.
foreach ( $galleries as &$this_gallery ) {
if ( is_string( $this_gallery ) ) {
$this_gallery = self::filter_the_content( $this_gallery );
}
}
unset( $this_gallery ); // break the reference.
return $galleries;
}
/**
* Runs the image widget through photon.
*
* @param array $instance Image widget instance data.
* @return array
*/
public static function filter_the_image_widget( $instance ) {
if ( Jetpack::is_module_active( 'photon' ) && ! $instance['attachment_id'] && $instance['url'] ) {
jetpack_photon_url(
$instance['url'],
array(
'w' => $instance['width'],
'h' => $instance['height'],
)
);
}
return $instance;
}
/**
* * CORE IMAGE RETRIEVAL
**/
/**
* Filter post thumbnail image retrieval, passing images through Photon
*
* @param string|bool $image Image URL.
* @param int $attachment_id Attachment ID.
* @param string|array $size Declared size or a size array.
* @uses is_admin, apply_filters, wp_get_attachment_url, self::validate_image_url, this::image_sizes, jetpack_photon_url
* @filter image_downsize
* @return string|bool
*/
public function filter_image_downsize( $image, $attachment_id, $size ) {
// Don't foul up the admin side of things, unless a plugin wants to.
if ( is_admin() &&
/**
* Provide plugins a way of running Photon for images in the WordPress Dashboard (wp-admin).
*
* Note: enabling this will result in Photon URLs added to your post content, which could make migrations across domains (and off Photon) a bit more challenging.
*
* @module photon
*
* @since 4.8.0
*
* @param bool false Stop Photon from being run on the Dashboard. Default to false.
* @param array $args {
* Array of image details.
*
* @type $image Image URL.
* @type $attachment_id Attachment ID of the image.
* @type $size Image size. Can be a string (name of the image size, e.g. full) or an array of width and height.
* }
*/
false === apply_filters( 'jetpack_photon_admin_allow_image_downsize', false, compact( 'image', 'attachment_id', 'size' ) )
) {
return $image;
}
/**
* Provide plugins a way of preventing Photon from being applied to images retrieved from WordPress Core.
*
* @module photon
*
* @since 2.0.0
*
* @param bool false Stop Photon from being applied to the image. Default to false.
* @param array $args {
* Array of image details.
*
* @type $image Image URL.
* @type $attachment_id Attachment ID of the image.
* @type $size Image size. Can be a string (name of the image size, e.g. full) or an array of width and height.
* }
*/
if ( apply_filters( 'jetpack_photon_override_image_downsize', false, compact( 'image', 'attachment_id', 'size' ) ) ) {
return $image;
}
// Get the image URL and proceed with Photon-ification if successful.
$image_url = wp_get_attachment_url( $attachment_id );
// Set this to true later when we know we have size meta.
$has_size_meta = false;
if ( $image_url ) {
// Check if image URL should be used with Photon.
if ( ! self::validate_image_url( $image_url ) ) {
return $image;
}
$intermediate = true; // For the fourth array item returned by the image_downsize filter.
// If an image is requested with a size known to WordPress, use that size's settings with Photon.
// WP states that `add_image_size()` should use a string for the name, but doesn't enforce that.
// Due to differences in how Core and Photon check for the registered image size, we check both types.
if ( ( is_string( $size ) || is_int( $size ) ) && array_key_exists( $size, self::image_sizes() ) ) {
$image_args = self::image_sizes();
$image_args = $image_args[ $size ];
$photon_args = array();
$image_meta = image_get_intermediate_size( $attachment_id, $size );
// 'full' is a special case: We need consistent data regardless of the requested size.
if ( 'full' === $size ) {
$image_meta = wp_get_attachment_metadata( $attachment_id );
$intermediate = false;
} elseif ( ! $image_meta ) {
// If we still don't have any image meta at this point, it's probably from a custom thumbnail size
// for an image that was uploaded before the custom image was added to the theme. Try to determine the size manually.
$image_meta = wp_get_attachment_metadata( $attachment_id );
if ( isset( $image_meta['width'], $image_meta['height'] ) ) {
$image_resized = image_resize_dimensions( $image_meta['width'], $image_meta['height'], $image_args['width'], $image_args['height'], $image_args['crop'] );
if ( $image_resized ) { // This could be false when the requested image size is larger than the full-size image.
$image_meta['width'] = $image_resized[6];
$image_meta['height'] = $image_resized[7];
}
}
}
if ( isset( $image_meta['width'], $image_meta['height'] ) ) {
$image_args['width'] = $image_meta['width'];
$image_args['height'] = $image_meta['height'];
list( $image_args['width'], $image_args['height'] ) = image_constrain_size_for_editor( $image_args['width'], $image_args['height'], $size, 'display' );
$has_size_meta = true;
}
// Expose determined arguments to a filter before passing to Photon.
$transform = $image_args['crop'] ? 'resize' : 'fit';
// Check specified image dimensions and account for possible zero values; photon fails to resize if a dimension is zero.
if ( 0 === $image_args['width'] || 0 === $image_args['height'] ) {
if ( 0 === $image_args['width'] && 0 < $image_args['height'] ) {
$photon_args['h'] = $image_args['height'];
} elseif ( 0 === $image_args['height'] && 0 < $image_args['width'] ) {
$photon_args['w'] = $image_args['width'];
}
} else {
$image_meta = wp_get_attachment_metadata( $attachment_id );
if ( ( 'resize' === $transform ) && $image_meta ) {
if ( isset( $image_meta['width'], $image_meta['height'] ) ) {
// Lets make sure that we don't upscale images since wp never upscales them as well.
$smaller_width = ( ( $image_meta['width'] < $image_args['width'] ) ? $image_meta['width'] : $image_args['width'] );
$smaller_height = ( ( $image_meta['height'] < $image_args['height'] ) ? $image_meta['height'] : $image_args['height'] );
$photon_args[ $transform ] = $smaller_width . ',' . $smaller_height;
}
} else {
$photon_args[ $transform ] = $image_args['width'] . ',' . $image_args['height'];
}
}
/**
* Filter the Photon Arguments added to an image when going through Photon, when that image size is a string.
* Image size will be a string (e.g. "full", "medium") when it is known to WordPress.
*
* @module photon
*
* @since 2.0.0
*
* @param array $photon_args Array of Photon arguments.
* @param array $args {
* Array of image details.
*
* @type array $image_args Array of Image arguments (width, height, crop).
* @type string $image_url Image URL.
* @type int $attachment_id Attachment ID of the image.
* @type string|int $size Image size. Can be a string (name of the image size, e.g. full) or an integer.
* @type string $transform Value can be resize or fit.
* @see https://developer.wordpress.com/docs/photon/api
* }
*/
$photon_args = apply_filters( 'jetpack_photon_image_downsize_string', $photon_args, compact( 'image_args', 'image_url', 'attachment_id', 'size', 'transform' ) );
// Generate Photon URL.
$image = array(
jetpack_photon_url( $image_url, $photon_args ),
$has_size_meta ? $image_args['width'] : false,
$has_size_meta ? $image_args['height'] : false,
$intermediate,
);
} elseif ( is_array( $size ) ) {
// Pull width and height values from the provided array, if possible.
$width = isset( $size[0] ) ? (int) $size[0] : false;
$height = isset( $size[1] ) ? (int) $size[1] : false;
// Don't bother if necessary parameters aren't passed.
if ( ! $width || ! $height ) {
return $image;
}
$image_meta = wp_get_attachment_metadata( $attachment_id );
if ( isset( $image_meta['width'], $image_meta['height'] ) ) {
$image_resized = image_resize_dimensions( $image_meta['width'], $image_meta['height'], $width, $height );
if ( $image_resized ) { // This could be false when the requested image size is larger than the full-size image.
$width = $image_resized[6];
$height = $image_resized[7];
} else {
$width = $image_meta['width'];
$height = $image_meta['height'];
}
$has_size_meta = true;
}
list( $width, $height ) = image_constrain_size_for_editor( $width, $height, $size );
// Expose arguments to a filter before passing to Photon.
$photon_args = array(
'fit' => $width . ',' . $height,
);
/**
* Filter the Photon Arguments added to an image when going through Photon,
* when the image size is an array of height and width values.
*
* @module photon
*
* @since 2.0.0
*
* @param array $photon_args Array of Photon arguments.
* @param array $args {
* Array of image details.
*
* @type $width Image width.
* @type height Image height.
* @type $image_url Image URL.
* @type $attachment_id Attachment ID of the image.
* }
*/
$photon_args = apply_filters( 'jetpack_photon_image_downsize_array', $photon_args, compact( 'width', 'height', 'image_url', 'attachment_id' ) );
// Generate Photon URL.
$image = array(
jetpack_photon_url( $image_url, $photon_args ),
$has_size_meta ? $width : false,
$has_size_meta ? $height : false,
$intermediate,
);
}
}
return $image;
}
/**
* Filters an array of image `srcset` values, replacing each URL with its Photon equivalent.
*
* @since 3.8.0
* @since 4.0.4 Added automatically additional sizes beyond declared image sizes.
*
* @param array $sources An array of image urls and widths.
* @param array $size_array The size array for srcset.
* @param array $image_src The image srcs.
* @param array $image_meta The image meta.
* @param int $attachment_id Attachment ID.
*
* @uses self::validate_image_url, jetpack_photon_url, Jetpack_Photon::parse_from_filename
* @uses Jetpack_Photon::strip_image_dimensions_maybe, Jetpack::get_content_width
*
* @return array An array of Photon image urls and widths.
*/
public function filter_srcset_array( $sources = array(), $size_array = array(), $image_src = array(), $image_meta = array(), $attachment_id = 0 ) {
if ( ! is_array( $sources ) ) {
return $sources;
}
$upload_dir = wp_get_upload_dir();
foreach ( $sources as $i => $source ) {
if ( ! self::validate_image_url( $source['url'] ) ) {
continue;
}
/** This filter is already documented in class.photon.php */
if ( apply_filters( 'jetpack_photon_skip_image', false, $source['url'], $source ) ) {
continue;
}
$url = $source['url'];
list( $width, $height ) = self::parse_dimensions_from_filename( $url );
// It's quicker to get the full size with the data we have already, if available.
if ( ! empty( $attachment_id ) ) {
$url = wp_get_attachment_url( $attachment_id );
} else {
$url = self::strip_image_dimensions_maybe( $url );
}
$args = array();
if ( 'w' === $source['descriptor'] ) {
if ( $height && ( $source['value'] === $width ) ) {
$args['resize'] = $width . ',' . $height;
} else {
$args['w'] = $source['value'];
}
}
$sources[ $i ]['url'] = jetpack_photon_url( $url, $args );
}
/**
* At this point, $sources is the original srcset with Photonized URLs.
* Now, we're going to construct additional sizes based on multiples of the content_width.
* This will reduce the gap between the largest defined size and the original image.
*/
/**
* Filter the multiplier Photon uses to create new srcset items.
* Return false to short-circuit and bypass auto-generation.
*
* @module photon
*
* @since 4.0.4
*
* @param array|bool $multipliers Array of multipliers to use or false to bypass.
*/
$multipliers = apply_filters( 'jetpack_photon_srcset_multipliers', array( 2, 3 ) );
$url = trailingslashit( $upload_dir['baseurl'] ) . $image_meta['file'];
if (
/** Short-circuit via jetpack_photon_srcset_multipliers filter. */
is_array( $multipliers )
/** This filter is already documented in class.photon.php */
&& ! apply_filters( 'jetpack_photon_skip_image', false, $url, null )
/** Verify basic meta is intact. */
&& isset( $image_meta['width'] ) && isset( $image_meta['height'] ) && isset( $image_meta['file'] )
/** Verify we have the requested width/height. */
&& isset( $size_array[0] ) && isset( $size_array[1] )
) {
$fullwidth = $image_meta['width'];
$fullheight = $image_meta['height'];
$reqwidth = $size_array[0];
$reqheight = $size_array[1];
$constrained_size = wp_constrain_dimensions( $fullwidth, $fullheight, $reqwidth );
$expected_size = array( $reqwidth, $reqheight );
if ( abs( $constrained_size[0] - $expected_size[0] ) <= 1 && abs( $constrained_size[1] - $expected_size[1] ) <= 1 ) {
$crop = 'soft';
$base = Jetpack::get_content_width() ? Jetpack::get_content_width() : 1000; // Provide a default width if none set by the theme.
} else {
$crop = 'hard';
$base = $reqwidth;
}
$currentwidths = array_keys( $sources );
$newsources = null;
foreach ( $multipliers as $multiplier ) {
$newwidth = $base * $multiplier;
foreach ( $currentwidths as $currentwidth ) {
// If a new width would be within 100 pixes of an existing one or larger than the full size image, skip.
if ( abs( $currentwidth - $newwidth ) < 50 || ( $newwidth > $fullwidth ) ) {
continue 2; // Bump out back to the $multipliers as $multiplier.
}
} //end foreach ( $currentwidths as $currentwidth ){
if ( 'soft' === $crop ) {
$args = array(
'w' => $newwidth,
);
} else { // hard crop, e.g. add_image_size( 'example', 200, 200, true ).
$args = array(
'zoom' => $multiplier,
'resize' => $reqwidth . ',' . $reqheight,
);
}
$newsources[ $newwidth ] = array(
'url' => jetpack_photon_url( $url, $args ),
'descriptor' => 'w',
'value' => $newwidth,
);
} //end foreach ( $multipliers as $multiplier )
if ( is_array( $newsources ) ) {
$sources = array_replace( $sources, $newsources );
}
} //end if isset( $image_meta['width'] ) && isset( $image_meta['file'] ) )
return $sources;
}
/**
* Filters an array of image `sizes` values, using $content_width instead of image's full size.
*
* @since 4.0.4
* @since 4.1.0 Returns early for images not within the_content.
* @param array $sizes An array of media query breakpoints.
* @param array $size Width and height of the image.
* @uses Jetpack::get_content_width
* @return array An array of media query breakpoints.
*/
public function filter_sizes( $sizes, $size ) {
if ( ! doing_filter( 'the_content' ) ) {
return $sizes;
}
$content_width = Jetpack::get_content_width();
if ( ! $content_width ) {
$content_width = 1000;
}
if ( ( is_array( $size ) && $size[0] < $content_width ) ) {
return $sizes;
}
return sprintf( '(max-width: %1$dpx) 100vw, %1$dpx', $content_width );
}
/**
* * GENERAL FUNCTIONS
**/
/**
* Ensure image URL is valid for Photon.
* Though Photon functions address some of the URL issues, we should avoid unnecessary processing if we know early on that the image isn't supported.
*
* @param string $url Image URL.
* @uses wp_parse_args
* @return bool
*/
protected static function validate_image_url( $url ) {
$parsed_url = wp_parse_url( $url );
if ( ! $parsed_url ) {
return false;
}
// Parse URL and ensure needed keys exist, since the array returned by `wp_parse_url` only includes the URL components it finds.
$url_info = wp_parse_args(
$parsed_url,
array(
'scheme' => null,
'host' => null,
'port' => null,
'path' => null,
)
);
// Bail if scheme isn't http or port is set that isn't port 80.
if (
( 'http' !== $url_info['scheme'] || ! in_array( $url_info['port'], array( 80, null ), true ) ) &&
/**
* Allow Photon to fetch images that are served via HTTPS.
*
* @module photon
*
* @since 2.4.0
* @since 3.9.0 Default to false.
*
* @param bool $reject_https Should Photon ignore images using the HTTPS scheme. Default to false.
*/
apply_filters( 'jetpack_photon_reject_https', false )
) {
return false;
}
// Bail if no host is found.
if ( is_null( $url_info['host'] ) ) {
return false;
}
// Bail if the image already went through Photon.
if ( preg_match( '#^i[\d]{1}.wp.com$#i', $url_info['host'] ) ) {
return false;
}
// Bail if no path is found.
if ( is_null( $url_info['path'] ) ) {
return false;
}
// Ensure image extension is acceptable.
if ( ! in_array( strtolower( pathinfo( $url_info['path'], PATHINFO_EXTENSION ) ), self::$extensions, true ) ) {
return false;
}
// If we got this far, we should have an acceptable image URL
// But let folks filter to decline if they prefer.
/**
* Overwrite the results of the validation steps an image goes through before to be considered valid to be used by Photon.
*
* @module photon
*
* @since 3.0.0
*
* @param bool true Is the image URL valid and can it be used by Photon. Default to true.
* @param string $url Image URL.
* @param array $parsed_url Array of information about the image.
*/
return apply_filters( 'photon_validate_image_url', true, $url, $parsed_url );
}
/**
* Checks if the file exists before it passes the file to photon.
*
* @param string $src The image URL.
* @return string
**/
public static function strip_image_dimensions_maybe( $src ) {
$stripped_src = $src;
// Build URL, first removing WP's resized string so we pass the original image to Photon.
if ( preg_match( '#(-\d+x\d+)\.(' . implode( '|', self::$extensions ) . '){1}$#i', $src, $src_parts ) ) {
$stripped_src = str_replace( $src_parts[1], '', $src );
$upload_dir = wp_get_upload_dir();
// Extracts the file path to the image minus the base url.
$file_path = substr( $stripped_src, strlen( $upload_dir['baseurl'] ) );
if ( file_exists( $upload_dir['basedir'] . $file_path ) ) {
$src = $stripped_src;
}
}
return $src;
}
/**
* Provide an array of available image sizes and corresponding dimensions.
* Similar to get_intermediate_image_sizes() except that it includes image sizes' dimensions, not just their names.
*
* @global $wp_additional_image_sizes
* @uses get_option
* @return array
*/
protected static function image_sizes() {
if ( null === self::$image_sizes ) {
global $_wp_additional_image_sizes;
// Populate an array matching the data structure of $_wp_additional_image_sizes so we have a consistent structure for image sizes.
$images = array(
'thumb' => array(
'width' => (int) get_option( 'thumbnail_size_w' ),
'height' => (int) get_option( 'thumbnail_size_h' ),
'crop' => (bool) get_option( 'thumbnail_crop' ),
),
'medium' => array(
'width' => (int) get_option( 'medium_size_w' ),
'height' => (int) get_option( 'medium_size_h' ),
'crop' => false,
),
'medium_large' => array(
'width' => (int) get_option( 'medium_large_size_w' ),
'height' => (int) get_option( 'medium_large_size_h' ),
'crop' => false,
),
'large' => array(
'width' => (int) get_option( 'large_size_w' ),
'height' => (int) get_option( 'large_size_h' ),
'crop' => false,
),
'full' => array(
'width' => null,
'height' => null,
'crop' => false,
),
);
// Compatibility mapping as found in wp-includes/media.php.
$images['thumbnail'] = $images['thumb'];
// Update class variable, merging in $_wp_additional_image_sizes if any are set.
if ( is_array( $_wp_additional_image_sizes ) && ! empty( $_wp_additional_image_sizes ) ) {
self::$image_sizes = array_merge( $images, $_wp_additional_image_sizes );
} else {
self::$image_sizes = $images;
}
}
return is_array( self::$image_sizes ) ? self::$image_sizes : array();
}
/**
* Pass og:image URLs through Photon
*
* @param array $tags Open graph tags.
* @param array $parameters Image parameters.
* @uses jetpack_photon_url
* @return array Open graph tags.
*/
public function filter_open_graph_tags( $tags, $parameters ) {
if ( empty( $tags['og:image'] ) ) {
return $tags;
}
$photon_args = array(
'fit' => sprintf( '%d,%d', 2 * $parameters['image_width'], 2 * $parameters['image_height'] ),
);
if ( is_array( $tags['og:image'] ) ) {
$images = array();
foreach ( $tags['og:image'] as $image ) {
$images[] = jetpack_photon_url( $image, $photon_args );
}
$tags['og:image'] = $images;
} else {
$tags['og:image'] = jetpack_photon_url( $tags['og:image'], $photon_args );
}
return $tags;
}
/**
* Returns empty array.
*
* @deprecated 8.8.0 Use filter_photon_noresize_intermediate_sizes.
*
* @return array Empty array.
*/
public function noresize_intermediate_sizes() {
_deprecated_function( __METHOD__, 'jetpack-8.8.0', '::filter_photon_noresize_intermediate_sizes' );
return __return_empty_array();
}
/**
* Enqueue Photon helper script
*
* @uses wp_enqueue_script, plugins_url
* @action wp_enqueue_script
* @return null
*/
public function action_wp_enqueue_scripts() {
if ( self::is_amp_endpoint() ) {
return;
}
wp_enqueue_script(
'jetpack-photon',
Assets::get_file_url_for_environment(
'_inc/build/photon/photon.min.js',
'modules/photon/photon.js'
),
array(),
20191001,
true
);
}
/**
* Determine if image_downsize should utilize Photon via REST API.
*
* The WordPress Block Editor (Gutenberg) and other REST API consumers using the wp/v2/media endpoint, especially in the "edit"
* context is more akin to the is_admin usage of Photon (see filter_image_downsize). Since consumers are trying to edit content in posts,
* Photon should not fire as it will fire later on display. By aborting an attempt to Photonize an image here, we
* prevents issues like https://github.com/Automattic/jetpack/issues/10580 .
*
* To determine if we're using the wp/v2/media endpoint, we hook onto the `rest_request_before_callbacks` filter and
* if determined we are using it in the edit context, we'll false out the `jetpack_photon_override_image_downsize` filter.
*
* @see Jetpack_Photon::filter_image_downsize()
*
* @param null|WP_Error $response REST API response.
* @param array $endpoint_data Endpoint data. Not used, but part of the filter.
* @param WP_REST_Request $request Request used to generate the response.
*
* @return null|WP_Error The original response object without modification.
*/
public function should_rest_photon_image_downsize( $response, $endpoint_data, $request ) {
if ( ! is_a( $request, 'WP_REST_Request' ) ) {
return $response; // Something odd is happening. Do nothing and return the response.
}
if ( is_wp_error( $response ) ) {
// If we're going to return an error, we don't need to do anything with Photon.
return $response;
}
$this->should_rest_photon_image_downsize_override( $request );
return $response;
}
/**
* Helper function to check if a WP_REST_Request is the media endpoint in the edit context.
*
* @param WP_REST_Request $request The current REST request.
*/
private function should_rest_photon_image_downsize_override( WP_REST_Request $request ) {
$route = $request->get_route();
if (
(
false !== strpos( $route, 'wp/v2/media' )
&& 'edit' === $request->get_param( 'context' )
)
|| false !== strpos( $route, 'wpcom/v2/external-media/copy' )
) {
// Don't use `__return_true()`: Use something unique. See ::_override_image_downsize_in_rest_edit_context()
// Late execution to avoid conflict with other plugins as we really don't want to run in this situation.
add_filter(
'jetpack_photon_override_image_downsize',
array(
$this,
'override_image_downsize_in_rest_edit_context',
),
999999
);
}
}
/**
* Brings in should_rest_photon_image_downsize for the rest_after_insert_attachment hook.
*
* @since 8.7.0
*
* @param WP_Post $attachment Inserted or updated attachment object.
* @param WP_REST_Request $request Request object.
*/
public function should_rest_photon_image_downsize_insert_attachment( WP_Post $attachment, WP_REST_Request $request ) {
if ( ! is_a( $request, 'WP_REST_Request' ) ) {
// Something odd is happening.
return;
}
$this->should_rest_photon_image_downsize_override( $request );
}
/**
* Remove the override we may have added in ::should_rest_photon_image_downsize()
* Since ::_override_image_downsize_in_rest_edit_context() is only
* every used here, we can always remove it without ever worrying
* about breaking any other configuration.
*
* @param mixed $response REST API Response.
* @return mixed Unchanged $response
*/
public function cleanup_rest_photon_image_downsize( $response ) {
remove_filter(
'jetpack_photon_override_image_downsize',
array(
$this,
'override_image_downsize_in_rest_edit_context',
),
999999
);
return $response;
}
/**
* Used internally by ::should_rest_photon_image_downsize() to not photonize
* image URLs in ?context=edit REST requests.
* MUST NOT be used anywhere else.
* We use a unique function instead of __return_true so that we can clean up
* after ourselves without breaking anyone else's filters.
*
* @internal
* @return true
*/
public function override_image_downsize_in_rest_edit_context() {
return true;
}
/**
* Return whether the current page is AMP.
*
* This is only present for the sake of WordPress.com where the Jetpack_AMP_Support
* class does not yet exist. This mehod may only be called at the wp action or later.
*
* @return bool Whether AMP page.
*/
private static function is_amp_endpoint() {
return class_exists( 'Jetpack_AMP_Support' ) && Jetpack_AMP_Support::is_amp_request();
}
}