← All changes | jetpack_vendor/automattic/jetpack-image-cdn/src/class-image-cdn.php +1488 -0 16.2-beta → 16.3 View file →

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	1	+<?php
	2	+/**
	3	+ * Class for photon functionality.
	4	+ *
	5	+ * @package automattic/jetpack-image-cdn
	6	+ */
	7	+
	8	+namespace Automattic\Jetpack\Image_CDN;
	9	+
	10	+/**
	11	+ * Class Image_CDN
	12	+ */
	13	+final class Image_CDN {
	14	+
	15	+ const PACKAGE_VERSION = '0.8.1';
	16	+
	17	+ /**
	18	+ * Singleton.
	19	+ *
	20	+ * @var null
	21	+ */
	22	+ private static $instance = null;
	23	+
	24	+ /**
	25	+ * Allowed extensions.
	26	+ *
	27	+ * @var string[] Allowed extensions must match https://code.trac.wordpress.org/browser/photon/index.php#L41
	28	+ */
	29	+ protected static $extensions = array(
	30	+ 'gif',
	31	+ 'jpg',
	32	+ 'jpeg',
	33	+ 'png',
	34	+ // Jetpack assumes Photon_OpenCV backend class is being used on the server. See link in docblock.
	35	+ 'webp', // Photon_OpenCV supports webp with libwebp-*, getimageformat() returns webp
	36	+ 'heic', // Photon_OpenCV supports webp with libheif-*, getimageformat() returns jpeg so does not match docblock
	37	+ );
	38	+
	39	+ /**
	40	+ * Image sizes.
	41	+ *
	42	+ * Don't access this directly. Instead, use self::image_sizes() so it's actually populated with something.
	43	+ *
	44	+ * @var array Image sizes.
	45	+ */
	46	+ private static $image_sizes = null;
	47	+
	48	+ /**
	49	+ * Whether Image CDN is enabled or not.
	50	+ *
	51	+ * This class will be instantiated if any plugin has activated image CDN module. Keeping this variable to check if module is active or not.
	52	+ *
	53	+ * @var bool Whether Image CDN is enabled or not.
	54	+ */
	55	+ private static $is_enabled = false;
	56	+
	57	+ /**
	58	+ * Singleton implementation
	59	+ *
	60	+ * @return object
	61	+ */
	62	+ public static function instance() {
	63	+ if ( ! self::$instance instanceof self ) {
	64	+ self::$instance = new self();
	65	+ self::$instance->setup();
	66	+ self::$is_enabled = true;
	67	+ }
	68	+
	69	+ return self::$instance;
	70	+ }
	71	+
	72	+ /**
	73	+ * Silence is golden.
	74	+ */
	75	+ private function __construct() {}
	76	+
	77	+ /**
	78	+ * Check if image CDN is enabled as a module from Jetpack or any other plugin.
	79	+ */
	80	+ public static function is_enabled() {
	81	+ return self::$is_enabled;
	82	+ }
	83	+
	84	+ /**
	85	+ * Register actions and filters, but only if basic Photon functions are available.
	86	+ * The basic functions are found in ./functions.photon.php.
	87	+ *
	88	+ * @uses add_action, add_filter
	89	+ * @return void
	90	+ */
	91	+ private function setup() {
	92	+ /**
	93	+ * Add a filter to easily apply image CDN urls without applying all `the_content` filters to any content.
	94	+ *
	95	+ * Since this is only applied if the module is active in Jetpack or any other plugin, it's a safe option to apply photon urls to any content.
	96	+ */
	97	+ add_filter( 'jetpack_image_cdn_content', array( __CLASS__, 'filter_the_content' ), 10 );
	98	+
	99	+ // Images in post content and galleries and widgets.
	100	+ add_filter( 'the_content', array( __CLASS__, 'filter_the_content' ), 999999 );
	101	+ add_filter( 'get_post_galleries', array( __CLASS__, 'filter_the_galleries' ), 999999 );
	102	+ add_filter( 'widget_media_image_instance', array( __CLASS__, 'filter_the_image_widget' ), 999999 );
	103	+ add_filter( 'widget_text', array( __CLASS__, 'filter_the_content' ) );
	104	+
	105	+ // Core image retrieval.
	106	+ add_filter( 'image_downsize', array( $this, 'filter_image_downsize' ), 10, 3 );
	107	+ add_filter( 'rest_request_before_callbacks', array( $this, 'should_rest_photon_image_downsize' ), 10, 3 );
	108	+ add_action( 'rest_after_insert_attachment', array( $this, 'should_rest_photon_image_downsize_insert_attachment' ), 10, 2 );
	109	+ add_filter( 'rest_request_after_callbacks', array( $this, 'cleanup_rest_photon_image_downsize' ) );
	110	+
	111	+ // Responsive image srcset substitution.
	112	+ add_filter( 'wp_calculate_image_srcset', array( $this, 'filter_srcset_array' ), 10, 5 );
	113	+ add_filter( 'wp_calculate_image_sizes', array( $this, 'filter_sizes' ), 1, 3 ); // Early so themes can still easily filter.
	114	+
	115	+ /**
	116	+ * Allow Photon to disable uploaded images resizing and use its own resize capabilities instead.
	117	+ *
	118	+ * @module photon
	119	+ *
	120	+ * @since 7.1.0
	121	+ *
	122	+ * @param bool false Should Photon enable noresize mode. Default to false.
	123	+ */
	124	+ if ( apply_filters( 'jetpack_photon_noresize_mode', false ) ) {
	125	+ $this->enable_noresize_mode();
	126	+ }
	127	+ }
	128	+
	129	+ /**
	130	+ * Enables the noresize mode for Photon, allowing to avoid intermediate size files generation.
	131	+ */
	132	+ private function enable_noresize_mode() {
	133	+ // The main objective of noresize mode is to disable additional resized image versions creation.
	134	+ // This filter handles removal of additional sizes.
	135	+ add_filter( 'intermediate_image_sizes_advanced', array( __CLASS__, 'filter_photon_noresize_intermediate_sizes' ) );
	136	+
	137	+ // Load the noresize srcset solution on priority of 20, allowing other plugins to set sizes earlier.
	138	+ add_filter( 'wp_get_attachment_metadata', array( __CLASS__, 'filter_photon_norezise_maybe_inject_sizes' ), 20, 2 );
	139	+
	140	+ // Photonize thumbnail URLs in the API response.
	141	+ add_filter( 'rest_api_thumbnail_size_urls', array( __CLASS__, 'filter_photon_noresize_thumbnail_urls' ) );
	142	+
	143	+ // This allows to assign the Photon domain to images that normally use the home URL as base.
	144	+ add_filter( 'jetpack_photon_domain', array( __CLASS__, 'filter_photon_norezise_domain' ), 10, 2 );
	145	+
	146	+ add_filter( 'the_content', array( __CLASS__, 'filter_content_add' ), 0 );
	147	+
	148	+ // Jetpack hooks in at six nines (999999) so this filter does at seven.
	149	+ add_filter( 'the_content', array( __CLASS__, 'filter_content_remove' ), 9999999 );
	150	+
	151	+ // Regular Photon operation mode filter doesn't run when is_admin(), so we need an additional filter.
	152	+ // This is temporary until Jetpack allows more easily running these filters for is_admin().
	153	+ if ( is_admin() ) {
	154	+ add_filter( 'image_downsize', array( $this, 'filter_image_downsize' ), 5, 3 );
	155	+
	156	+ // Allows any image that gets passed to Photon to be resized via Photon.
	157	+ add_filter( 'jetpack_photon_admin_allow_image_downsize', '__return_true' );
	158	+ }
	159	+ }
	160	+
	161	+ /**
	162	+ * This is our catch-all to strip dimensions from intermediate images in content.
	163	+ * Since this primarily only impacts post_content we do a little dance to add the filter early
	164	+ * to `the_content` and then remove it later on in the same hook.
	165	+ *
	166	+ * @param String $content the post content.
	167	+ * @return String the post content unchanged.
	168	+ */
	169	+ public static function filter_content_add( $content ) {
	170	+ add_filter( 'jetpack_photon_pre_image_url', array( __CLASS__, 'strip_image_dimensions_maybe' ) );
	171	+ return $content;
	172	+ }
	173	+
	174	+ /**
	175	+ * Removing the content filter that was set previously.
	176	+ *
	177	+ * @param String $content the post content.
	178	+ * @return String the post content unchanged.
	179	+ */
	180	+ public static function filter_content_remove( $content ) {
	181	+ remove_filter( 'jetpack_photon_pre_image_url', array( __CLASS__, 'strip_image_dimensions_maybe' ) );
	182	+ return $content;
	183	+ }
	184	+
	185	+ /**
	186	+ * Short circuits the Photon filter to enable Photon processing for any URL.
	187	+ *
	188	+ * @param String $photon_url a proposed Photon URL for the media file.
	189	+ *
	190	+ * @return String an URL to be used for the media file.
	191	+ */
	192	+ public static function filter_photon_norezise_domain( $photon_url ) {
	193	+ return $photon_url;
	194	+ }
	195	+
	196	+ /**
	197	+ * Disables intermediate sizes to disallow resizing.
	198	+ *
	199	+ * @return array Empty array.
	200	+ */
	201	+ public static function filter_photon_noresize_intermediate_sizes() {
	202	+ return array();
	203	+ }
	204	+
	205	+ /**
	206	+ * Filter thumbnail URLS to not generate.
	207	+ *
	208	+ * @param array $sizes Image sizes.
	209	+ *
	210	+ * @return mixed
	211	+ */
	212	+ public static function filter_photon_noresize_thumbnail_urls( $sizes ) {
	213	+ foreach ( $sizes as $size => $url ) {
	214	+ $parts = explode( '?', $url );
	215	+ $arguments = $parts[1] ?? array();
	216	+
	217	+ $sizes[ $size ] = Image_CDN_Core::cdn_url( $url, wp_parse_args( $arguments ) );
	218	+ }
	219	+
	220	+ return $sizes;
	221	+ }
	222	+
	223	+ /**
	224	+ * Inject image sizes to attachment metadata.
	225	+ *
	226	+ * @param array $data Attachment metadata.
	227	+ * @param int $attachment_id Attachment's post ID.
	228	+ *
	229	+ * @return array Attachment metadata.
	230	+ */
	231	+ public static function filter_photon_norezise_maybe_inject_sizes( $data, $attachment_id ) {
	232	+ // Can't do much if data is empty.
	233	+ if ( empty( $data ) ) {
	234	+ return $data;
	235	+ }
	236	+ $sizes_already_exist = (
	237	+ is_array( $data )
	238	+ && array_key_exists( 'sizes', $data )
	239	+ && is_array( $data['sizes'] )
	240	+ && ! empty( $data['sizes'] )
	241	+ );
	242	+ if ( $sizes_already_exist ) {
	243	+ return $data;
	244	+ }
	245	+ // Missing some critical data we need to determine sizes, not processing.
	246	+ if ( ! isset( $data['file'] )
	247	+ || ! isset( $data['width'] )
	248	+ || ! isset( $data['height'] )
	249	+ ) {
	250	+ return $data;
	251	+ }
	252	+
	253	+ $mime_type = get_post_mime_type( $attachment_id );
	254	+ $attachment_is_image = preg_match( '!^image/!', $mime_type );
	255	+
	256	+ if ( 1 === $attachment_is_image ) {
	257	+ $image_sizes = new Image_CDN_Image_Sizes( $attachment_id, $data );
	258	+ $data['sizes'] = $image_sizes->generate_sizes_meta();
	259	+ }
	260	+ return $data;
	261	+ }
	262	+
	263	+ /**
	264	+ * Inject image sizes to Jetpack REST API responses. This wraps the filter_photon_norezise_maybe_inject_sizes function.
	265	+ *
	266	+ * @param array $sizes Attachment sizes data.
	267	+ * @param int $attachment_id Attachment's post ID.
	268	+ *
	269	+ * @return array Attachment sizes array.
	270	+ */
	271	+ public static function filter_photon_norezise_maybe_inject_sizes_api( $sizes, $attachment_id ) {
	272	+ return self::filter_photon_norezise_maybe_inject_sizes( wp_get_attachment_metadata( $attachment_id ), $attachment_id );
	273	+ }
	274	+
	275	+ /**
	276	+ * * IN-CONTENT IMAGE MANIPULATION FUNCTIONS
	277	+ **/
	278	+
	279	+ /**
	280	+ * Match all images and any relevant <a> tags in a block of HTML.
	281	+ *
	282	+ * @param string $content Some HTML.
	283	+ * @return array An array of $images matches, where $images[0] is
	284	+ * an array of full matches, and the link_url, img_tag,
	285	+ * and img_url keys are arrays of those matches.
	286	+ */
	287	+ public static function parse_images_from_html( $content ) {
	288	+ $images = array();
	289	+
	290	+ if ( preg_match_all( '#(?:<a[^>]*?\s+?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 ) ) {
	291	+ foreach ( $images as $key => $unused ) {
	292	+ // Simplify the output as much as possible, mostly for confirming test results.
	293	+ if ( is_numeric( $key ) && $key > 0 ) {
	294	+ unset( $images[ $key ] );
	295	+ }
	296	+ }
	297	+
	298	+ return $images;
	299	+ }
	300	+
	301	+ return array();
	302	+ }
	303	+
	304	+ /**
	305	+ * Try to determine height and width from strings WP appends to resized image filenames.
	306	+ *
	307	+ * @param string $src The image URL.
	308	+ * @return array An array consisting of width and height.
	309	+ */
	310	+ public static function parse_dimensions_from_filename( $src ) {
	311	+ $width_height_string = array();
	312	+
	313	+ if ( preg_match( '#-(\d+)x(\d+)\.(?:' . implode( '|', self::$extensions ) . '){1}(?:\?.*)?$#i', $src, $width_height_string ) ) {
	314	+ $width = (int) $width_height_string[1];
	315	+ $height = (int) $width_height_string[2];
	316	+
	317	+ if ( $width && $height ) {
	318	+ return array( $width, $height );
	319	+ }
	320	+ }
	321	+
	322	+ return array( false, false );
	323	+ }
	324	+
	325	+ /**
	326	+ * Identify images in post content, and if images are local (uploaded to the current site), pass through Photon.
	327	+ *
	328	+ * @param string|mixed $content The content; should be a string but will convert to an empty string if not.
	329	+ *
	330	+ * @uses self::validate_image_url, apply_filters, Image_CDN_Core::cdn_url, esc_url
	331	+ * @filter the_content
	332	+ *
	333	+ * @return string The content.
	334	+ */
	335	+ public static function filter_the_content( $content ) {
	336	+ // Early return if content is empty or not a string.
	337	+ if ( ! is_string( $content ) || '' === $content ) {
	338	+ return '';
	339	+ }
	340	+
	341	+ static $image_tags = array( 'IMG', 'AMP-IMG', 'AMP-ANIM' );
	342	+ $content_width = null;
	343	+ $image_sizes = null;
	344	+ $upload_dir = null;
	345	+ $processor = new \WP_HTML_Tag_Processor( $content );
	346	+ $nearest_preceding_href = null;
	347	+
	348	+ // Visit every image-containing tag in the document.
	349	+ while ( $processor->next_tag( array( 'tag_closers' => 'visit' ) ) ) {
	350	+ /*
	351	+ * When an image is wrapped by an A element, the goal is to modify
	352	+ * both elements. Thus it's important to track links that may be
	353	+ * opened before reaching any image. In normative HTML this detection
	354	+ * is reliable enough, but it could be confused in cases where other
	355	+ * tags implicitly close the A. If this additional reliability is
	356	+ * required, replace the Tag Processor with the HTML Processor.
	357	+ */
	358	+ if ( 'A' === $processor->get_tag() ) {
	359	+ // If this is a closing tag the attribute will be `null`.
	360	+ $nearest_preceding_href = $processor->get_attribute( 'href' );
	361	+ $processor->set_bookmark( 'link' );
	362	+ continue;
	363	+ }
	364	+
	365	+ // Identify image source.
	366	+ $src_orig = $processor->get_attribute( 'src' );
	367	+ $src = $src_orig;
	368	+ $placeholder_src = null;
	369	+ $placeholder_src_orig = null;
	370	+
	371	+ /*
	372	+ * Only examine tags that are considered an image,
	373	+ * with a valid src attribute.
	374	+ * If encountering a closing tag then this is not the image being sought.
	375	+ */
	376	+ if (
	377	+ $processor->is_tag_closer()
	378	+ || ! in_array( $processor->get_tag(), $image_tags, true )
	379	+ || ! is_string( $src )
	380	+ || $src === ''
	381	+ ) {
	382	+ continue;
	383	+ }
	384	+
	385	+ $processor->set_bookmark( 'image' );
	386	+
	387	+ /*
	388	+ * At this point a target image has been found. Initialize the
	389	+ * shared data and then process each image as it appears.
	390	+ */
	391	+ if ( null === $content_width ) {
	392	+ $content_width = Image_CDN_Core::get_jetpack_content_width();
	393	+ $image_sizes = self::image_sizes();
	394	+ $upload_dir = wp_get_upload_dir();
	395	+ }
	396	+
	397	+ /*
	398	+ * To preserve legacy behaviors for filtering by third-party plugins,
	399	+ * create a normalized HTML string representing the tag. This will
	400	+ * present all attributes as double-quoted attributes and include at
	401	+ * most one copy of each attribute, escaping all values appropriately.
	402	+ */
	403	+ $tag_name = strtolower( (string) $processor->get_tag() );
	404	+ $tag = new \WP_HTML_Tag_Processor( "<{$tag_name}>" );
	405	+ $tag->next_tag();
	406	+ foreach ( $processor->get_attribute_names_with_prefix( '' ) ?? array() as $name ) {
	407	+ $tag->set_attribute( $name, $processor->get_attribute( $name ) );
	408	+ }
	409	+ $tag = $tag->get_updated_html();
	410	+
	411	+ // Default to resize, though fit may be used in certain cases where a dimension cannot be ascertained.
	412	+ $transform = 'resize';
	413	+
	414	+ // Flag if we need to munge a fullsize URL.
	415	+ $fullsize_url = false;
	416	+
	417	+ /**
	418	+ * Allow specific images to be skipped by Photon.
	419	+ *
	420	+ * @module photon
	421	+ *
	422	+ * @since 2.0.3
	423	+ *
	424	+ * @param bool false Should Photon ignore this image. Default to false.
	425	+ * @param string $src Image URL.
	426	+ * @param string|array|null $tag Image Tag (Image HTML output) or array of image details for srcset.
	427	+ */
	428	+ if ( apply_filters( 'jetpack_photon_skip_image', false, $src, $tag ) ) {
	429	+ continue;
	430	+ }
	431	+
	432	+ $data_lazy_src = $processor->get_attribute( 'data-lazy-src' );
	433	+ $data_lazy_original = $processor->get_attribute( 'data-lazy-original' );
	434	+
	435	+ $source_type = 'src';
	436	+ $chosen_data_src = null;
	437	+
	438	+ // Prefer a URL from the `data-lazy-src` attribute.
	439	+ if ( null === $chosen_data_src && is_string( $data_lazy_src ) && ! empty( $data_lazy_src ) ) {
	440	+ $source_type = 'data-lazy-src';
	441	+ $chosen_data_src = $data_lazy_src;
	442	+ }
	443	+
	444	+ // Fall back to a URL from the `data-lazy-original` attribute.
	445	+ if ( null === $chosen_data_src && is_string( $data_lazy_original ) && ! empty( $data_lazy_original ) ) {
	446	+ $source_type = 'data-lazy-original';
	447	+ $chosen_data_src = $data_lazy_original;
	448	+ }
	449	+
	450	+ // Update the src if one was provided in the `data-lazy-` attributes.
	451	+ if ( 'src' !== $source_type ) {
	452	+ $placeholder_src_orig = $src;
	453	+ $placeholder_src = $placeholder_src_orig;
	454	+ $src_orig = $chosen_data_src;
	455	+ $src = $src_orig;
	456	+ }
	457	+
	458	+ // Check if image URL should be used with Photon.
	459	+ if ( self::validate_image_url( $src ) ) {
	460	+ $width = $processor->get_attribute( 'width' );
	461	+ $height = $processor->get_attribute( 'height' );
	462	+
	463	+ // First, check the image tag. Note we only check for pixel sizes now; HTML4 percentages have never been correctly
	464	+ // supported, so we stopped pretending to support them in JP 9.1.0.
	465	+ if ( ! is_string( $width ) || ! ctype_digit( $width ) ) {
	466	+ $width = false;
	467	+ }
	468	+
	469	+ if ( ! is_string( $height ) || ! ctype_digit( $height ) ) {
	470	+ $height = false;
	471	+ }
	472	+
	473	+ $needs_sizing = false === $width && false === $height;
	474	+ $size = null;
	475	+
	476	+ if ( $needs_sizing ) {
	477	+ // Find the first CSS class listed with a prefix of `size-`, e.g. `size-full-width`
	478	+ foreach ( $processor->class_list() ?? array() as $class_name ) {
	479	+ if ( str_starts_with( $class_name, 'size-' ) ) {
	480	+ $size = substr( $class_name, strlen( 'size-' ) );
	481	+ break;
	482	+ }
	483	+ }
	484	+ }
	485	+
	486	+ if ( $needs_sizing && 'full' !== $size && is_string( $size ) && isset( $image_sizes[ $size ] ) && is_array( $image_sizes[ $size ] ) ) {
	487	+ $width = (int) $image_sizes[ $size ]['width'];
	488	+ $height = (int) $image_sizes[ $size ]['height'];
	489	+ $transform = $image_sizes[ $size ]['crop'] ? 'resize' : 'fit';
	490	+ } else {
	491	+ unset( $size );
	492	+ }
	493	+
	494	+ // WP Attachment ID, if uploaded to this site.
	495	+ $attachment_id = null;
	496	+ foreach ( $processor->class_list() ?? array() as $class_name ) {
	497	+ if ( str_starts_with( $class_name, 'wp-image-' ) ) {
	498	+ $attachment_id = substr( $class_name, strlen( 'wp-image-' ) );
	499	+ break;
	500	+ }
	501	+ }
	502	+
	503	+ // These values have not been used for a very long time, but removing them could break something.
	504	+ $images = array();
	505	+ $index = 0;
	506	+ if (
	507	+ $attachment_id &&
	508	+ preg_match( '#^[1-9][0-9]*$#', $attachment_id ) &&
	509	+ is_array( $upload_dir ) &&
	510	+ str_starts_with( $src, $upload_dir['baseurl'] ) &&
	511	+ /**
	512	+ * Filter whether an image using an attachment ID in its class has to be uploaded to the local site to go through Photon.
	513	+ *
	514	+ * @module photon
	515	+ *
	516	+ * @since 2.0.3
	517	+ *
	518	+ * @param bool false Was the image uploaded to the local site. Default to false.
	519	+ * @param array $args {
	520	+ * Array of image details.
	521	+ *
	522	+ * @type $src Image URL.
	523	+ * @type tag Image tag (Image HTML output).
	524	+ * }
	525	+ */
	526	+ apply_filters( 'jetpack_photon_image_is_local', false, compact( 'src', 'tag', 'images', 'index' ) )
	527	+ ) {
	528	+ $attachment_id = (int) $attachment_id;
	529	+ $attachment = get_post( $attachment_id );
	530	+
	531	+ // Basic check on returned post object.
	532	+ if ( is_object( $attachment ) && ! is_wp_error( $attachment ) && 'attachment' === $attachment->post_type ) {
	533	+ $src_per_wp = wp_get_attachment_image_src( $attachment_id, $size ?? 'full' );
	534	+
	535	+ if ( self::validate_image_url( $src_per_wp[0] ) ) {
	536	+ $src = $src_per_wp[0];
	537	+ $fullsize_url = true;
	538	+
	539	+ // Prevent image distortion if a detected dimension exceeds the image's natural dimensions.
	540	+ if ( ( false !== $width && $width > $src_per_wp[1] ) || ( false !== $height && $height > $src_per_wp[2] ) ) {
	541	+ $width = false === $width ? false : min( $width, $src_per_wp[1] );
	542	+ $height = false === $height ? false : min( $height, $src_per_wp[2] );
	543	+ }
	544	+
	545	+ // If no width and height are found, max out at source image's natural dimensions.
	546	+ // Otherwise, respect registered image sizes' cropping setting.
	547	+ if ( false === $width && false === $height ) {
	548	+ $width = $src_per_wp[1];
	549	+ $height = $src_per_wp[2];
	550	+ $transform = 'fit';
	551	+ } elseif ( isset( $size ) && is_array( $image_sizes ) && array_key_exists( $size, $image_sizes ) && isset( $image_sizes[ $size ]['crop'] ) ) {
	552	+ $transform = $image_sizes[ $size ]['crop'] ? 'resize' : 'fit';
	553	+ }
	554	+ }
	555	+ } else {
	556	+ unset( $attachment_id );
	557	+ unset( $attachment );
	558	+ }
	559	+ }
	560	+
	561	+ // If image tag lacks width and height arguments, try to determine from strings WP appends to resized image filenames.
	562	+ if ( false === $width && false === $height ) {
	563	+ list( $width, $height ) = self::parse_dimensions_from_filename( $src );
	564	+ }
	565	+
	566	+ $width_orig = $width;
	567	+ $height_orig = $height;
	568	+ $transform_orig = $transform;
	569	+
	570	+ // If width is available, constrain to $content_width.
	571	+ if ( false !== $width && is_numeric( $content_width ) && $width > $content_width ) {
	572	+ if ( false !== $height ) {
	573	+ $height = round( ( $content_width * $height ) / $width );
	574	+ }
	575	+ $width = $content_width;
	576	+ }
	577	+
	578	+ // Set a width if none is found and $content_width is available.
	579	+ // If width is set in this manner and height is available, use `fit` instead of `resize` to prevent skewing.
	580	+ if ( false === $width && is_numeric( $content_width ) ) {
	581	+ $width = (int) $content_width;
	582	+
	583	+ if ( false !== $height ) {
	584	+ $transform = 'fit';
	585	+ }
	586	+ }
	587	+
	588	+ // Detect if image source is for a custom-cropped thumbnail and prevent further URL manipulation.
	589	+ if ( ! $fullsize_url && preg_match_all( '#-e[a-z0-9]+(-\d+x\d+)?\.(' . implode( '|', self::$extensions ) . '){1}$#i', basename( $src ), $filename ) ) {
	590	+ $fullsize_url = true;
	591	+ }
	592	+
	593	+ // Build URL, first maybe removing WP's resized string so we pass the original image to Photon.
	594	+ if ( ! $fullsize_url && is_array( $upload_dir ) && str_starts_with( $src, $upload_dir['baseurl'] ) ) {
	595	+ $src = self::strip_image_dimensions_maybe( $src );
	596	+ }
	597	+
	598	+ // Build array of Photon args and expose to filter before passing to Photon URL function.
	599	+ $args = array();
	600	+
	601	+ if ( false !== $width && false !== $height ) {
	602	+ $args[ $transform ] = $width . ',' . $height;
	603	+ } elseif ( false !== $width ) {
	604	+ $args['w'] = $width;
	605	+ } elseif ( false !== $height ) {
	606	+ $args['h'] = $height;
	607	+ }
	608	+
	609	+ /**
	610	+ * Filter the array of Photon arguments added to an image when it goes through Photon.
	611	+ * By default, only includes width and height values.
	612	+ *
	613	+ * @see https://developer.wordpress.com/docs/photon/api/
	614	+ *
	615	+ * @module photon
	616	+ *
	617	+ * @since 2.0.0
	618	+ * @since 0.4.7 Passes image tag name instead of full HTML of tag.
	619	+ *
	620	+ * @param array $args Array of Photon Arguments.
	621	+ * @param array $details {
	622	+ * Array of image details.
	623	+ *
	624	+ * @type string $tag Image tag (Image HTML output).
	625	+ * @type string $src Image URL.
	626	+ * @type string $src_orig Original Image URL.
	627	+ * @type int|false $width Image width.
	628	+ * @type int|false $height Image height.
	629	+ * @type int|false $width_orig Original image width before constrained by content_width.
	630	+ * @type int|false $height_orig Original Image height before constrained by content_width.
	631	+ * @type string $transform Transform.
	632	+ * @type string $transform_orig Original transform before constrained by content_width.
	633	+ * }
	634	+ */
	635	+ $args = apply_filters( 'jetpack_photon_post_image_args', $args, compact( 'tag', 'src', 'src_orig', 'width', 'height', 'width_orig', 'height_orig', 'transform', 'transform_orig' ) );
	636	+
	637	+ $photon_url = Image_CDN_Core::cdn_url( $src, $args );
	638	+
	639	+ // Modify image tag if Photon function provides a URL
	640	+ // 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.
	641	+ if ( $src !== $photon_url ) {
	642	+ // If present, replace the link href with a Photoned URL for the full-size image.
	643	+ if ( is_string( $nearest_preceding_href ) && self::validate_image_url( $nearest_preceding_href ) ) {
	644	+ $processor->seek( 'link' );
	645	+ $processor->set_attribute( 'href', Image_CDN_Core::cdn_url( $nearest_preceding_href ) );
	646	+ $processor->seek( 'image' );
	647	+ }
	648	+
	649	+ // Supplant the original source value with our Photon URL.
	650	+ $processor->set_attribute( 'src', $photon_url );
	651	+
	652	+ // If Lazy Load is in use, pass placeholder image through Photon.
	653	+ if ( $placeholder_src !== null && self::validate_image_url( $placeholder_src ) ) {
	654	+ $placeholder_src = Image_CDN_Core::cdn_url( $placeholder_src );
	655	+
	656	+ if ( $placeholder_src !== $placeholder_src_orig ) {
	657	+ $processor->set_attribute( $source_type, $placeholder_src );
	658	+ }
	659	+ }
	660	+
	661	+ // If we are not transforming the image with resize, fit, or letterbox (lb), then we should remove
	662	+ // the width and height arguments (including HTML4 percentages) from the image to prevent distortion.
	663	+ // Even if $args['w'] and $args['h'] are present, Photon does not crop to those dimensions. Instead,
	664	+ // it appears to favor height.
	665	+ //
	666	+ // If we are transforming the image via one of those methods, let's update the width and height attributes.
	667	+ if ( empty( $args['resize'] ) && empty( $args['fit'] ) && empty( $args['lb'] ) ) {
	668	+ $processor->remove_attribute( 'width' );
	669	+ $processor->remove_attribute( 'height' );
	670	+ } else {
	671	+ $resize_args = $args['resize'] ?? false;
	672	+ if ( false === $resize_args ) {
	673	+ $resize_args = ( ! $resize_args && isset( $args['fit'] ) )
	674	+ ? $args['fit']
	675	+ : false;
	676	+ }
	677	+ if ( false === $resize_args ) {
	678	+ $resize_args = ( ! $resize_args && isset( $args['lb'] ) )
	679	+ ? $args['lb']
	680	+ : false;
	681	+ }
	682	+
	683	+ list( $resize_width, $resize_height ) = explode( ',', $resize_args );
	684	+ $processor->set_attribute( 'width', trim( $resize_width ) );
	685	+ $processor->set_attribute( 'height', trim( $resize_height ) );
	686	+ }
	687	+
	688	+ // Tag an image for dimension checking.
	689	+ if ( ! self::is_amp_endpoint() ) {
	690	+ $processor->set_attribute( 'data-recalc-dims', '1' );
	691	+ }
	692	+ }
	693	+ } elseif (
	694	+ preg_match( '#^http(s)?://i[\d]{1}.wp.com#', $src )
	695	+ && is_string( $nearest_preceding_href )
	696	+ && self::validate_image_url( $nearest_preceding_href )
	697	+ ) {
	698	+ $processor->seek( 'link' );
	699	+ $processor->set_attribute( 'href', Image_CDN_Core::cdn_url( $nearest_preceding_href ) );
	700	+ $processor->seek( 'image' );
	701	+ }
	702	+ }
	703	+
	704	+ return $processor->get_updated_html();
	705	+ }
	706	+
	707	+ /**
	708	+ * Filter Core galleries
	709	+ *
	710	+ * @param array $galleries Gallery array.
	711	+ *
	712	+ * @return array
	713	+ */
	714	+ public static function filter_the_galleries( $galleries ) {
	715	+ if ( empty( $galleries ) || ! is_array( $galleries ) ) {
	716	+ return $galleries;
	717	+ }
	718	+
	719	+ // Pass by reference, so we can modify them in place.
	720	+ foreach ( $galleries as &$this_gallery ) {
	721	+ if ( is_string( $this_gallery ) ) {
	722	+ $this_gallery = self::filter_the_content( $this_gallery );
	723	+ }
	724	+ }
	725	+ unset( $this_gallery ); // break the reference.
	726	+
	727	+ return $galleries;
	728	+ }
	729	+
	730	+ /**
	731	+ * Runs the image widget through photon.
	732	+ *
	733	+ * @param array $instance Image widget instance data.
	734	+ * @return array
	735	+ */
	736	+ public static function filter_the_image_widget( $instance ) {
	737	+ if ( ! $instance['attachment_id'] && $instance['url'] ) {
	738	+ Image_CDN_Core::cdn_url(
	739	+ $instance['url'],
	740	+ array(
	741	+ 'w' => $instance['width'],
	742	+ 'h' => $instance['height'],
	743	+ )
	744	+ );
	745	+ }
	746	+
	747	+ return $instance;
	748	+ }
	749	+
	750	+ /**
	751	+ * * CORE IMAGE RETRIEVAL
	752	+ **/
	753	+
	754	+ /**
	755	+ * Filter post thumbnail image retrieval, passing images through Photon
	756	+ *
	757	+ * @param string|bool $image Image URL.
	758	+ * @param int $attachment_id Attachment ID.
	759	+ * @param string|array $size Declared size or a size array.
	760	+ * @uses is_admin, apply_filters, wp_get_attachment_url, self::validate_image_url, this::image_sizes, jetpack_photon_url
	761	+ * @filter image_downsize
	762	+ * @return string|bool
	763	+ */
	764	+ public function filter_image_downsize( $image, $attachment_id, $size ) {
	765	+ // Don't foul up the admin side of things, unless a plugin wants to.
	766	+ if ( is_admin() &&
	767	+ /**
	768	+ * Provide plugins a way of running Photon for images in the WordPress Dashboard (wp-admin).
	769	+ *
	770	+ * 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.
	771	+ *
	772	+ * @module photon
	773	+ *
	774	+ * @since 4.8.0
	775	+ *
	776	+ * @param bool false Stop Photon from being run on the Dashboard. Default to false.
	777	+ * @param array $args {
	778	+ * Array of image details.
	779	+ *
	780	+ * @type $image Image URL.
	781	+ * @type $attachment_id Attachment ID of the image.
	782	+ * @type $size Image size. Can be a string (name of the image size, e.g. full) or an array of width and height.
	783	+ * }
	784	+ */
	785	+ false === apply_filters( 'jetpack_photon_admin_allow_image_downsize', false, compact( 'image', 'attachment_id', 'size' ) )
	786	+ ) {
	787	+ return $image;
	788	+ }
	789	+
	790	+ /**
	791	+ * Provide plugins a way of preventing Photon from being applied to images retrieved from WordPress Core.
	792	+ *
	793	+ * @module photon
	794	+ *
	795	+ * @since 2.0.0
	796	+ *
	797	+ * @param bool false Stop Photon from being applied to the image. Default to false.
	798	+ * @param array $args {
	799	+ * Array of image details.
	800	+ *
	801	+ * @type $image Image URL.
	802	+ * @type $attachment_id Attachment ID of the image.
	803	+ * @type $size Image size. Can be a string (name of the image size, e.g. full) or an array of width and height.
	804	+ * }
	805	+ */
	806	+ if ( apply_filters( 'jetpack_photon_override_image_downsize', false, compact( 'image', 'attachment_id', 'size' ) ) ) {
	807	+ return $image;
	808	+ }
	809	+
	810	+ // Get the image URL and proceed with Photon-ification if successful.
	811	+ $image_url = wp_get_attachment_url( $attachment_id );
	812	+
	813	+ // Set this to true later when we know we have size meta.
	814	+ $has_size_meta = false;
	815	+
	816	+ if ( $image_url ) {
	817	+ // Check if image URL should be used with Photon.
	818	+ if ( ! self::validate_image_url( $image_url ) ) {
	819	+ return $image;
	820	+ }
	821	+
	822	+ $intermediate = true; // For the fourth array item returned by the image_downsize filter.
	823	+
	824	+ $registered_size = self::find_registered_image_size( $size );
	825	+
	826	+ // If an image is requested with a size known to WordPress, use that size's settings with Photon.
	827	+ if ( $registered_size ) {
	828	+ $size = $registered_size;
	829	+ $image_args = self::image_sizes();
	830	+ $image_args = $image_args[ $size ];
	831	+
	832	+ $photon_args = array();
	833	+
	834	+ $image_meta = image_get_intermediate_size( $attachment_id, $size );
	835	+
	836	+ // 'full' is a special case: We need consistent data regardless of the requested size.
	837	+ if ( 'full' === $size ) {
	838	+ $image_meta = wp_get_attachment_metadata( $attachment_id );
	839	+ $intermediate = false;
	840	+ } elseif ( ! $image_meta ) {
	841	+ // If we still don't have any image meta at this point, it's probably from a custom thumbnail size
	842	+ // for an image that was uploaded before the custom image was added to the theme. Try to determine the size manually.
	843	+ $image_meta = wp_get_attachment_metadata( $attachment_id );
	844	+
	845	+ if ( isset( $image_meta['width'] ) && isset( $image_meta['height'] ) ) {
	846	+ $image_resized = image_resize_dimensions( $image_meta['width'], $image_meta['height'], $image_args['width'], $image_args['height'], $image_args['crop'] );
	847	+ if (
	848	+ $image_resized // This could be false when the requested image size is larger than the full-size image.
	849	+ && isset( $image_resized[6] ) // This key can be manipulated by the `image_resize_dimensions` filter
	850	+ && isset( $image_resized[7] ) // This key can be manipulated by the `image_resize_dimensions` filter
	851	+ ) {
	852	+ $image_meta['width'] = $image_resized[6];
	853	+ $image_meta['height'] = $image_resized[7];
	854	+ }
	855	+ }
	856	+ }
	857	+
	858	+ if ( isset( $image_meta['width'] ) && isset( $image_meta['height'] ) ) {
	859	+ $image_args['width'] = (int) $image_meta['width'];
	860	+ $image_args['height'] = (int) $image_meta['height'];
	861	+
	862	+ list( $image_args['width'], $image_args['height'] ) = image_constrain_size_for_editor( $image_args['width'], $image_args['height'], $size, 'display' );
	863	+ $has_size_meta = true;
	864	+ }
	865	+
	866	+ // Expose determined arguments to a filter before passing to Photon.
	867	+ $transform = $image_args['crop'] ? 'resize' : 'fit';
	868	+
	869	+ // Check specified image dimensions and account for possible zero values; photon fails to resize if a dimension is zero.
	870	+ if ( 0 === $image_args['width'] || 0 === $image_args['height'] ) {
	871	+ if ( 0 === $image_args['width'] && 0 < $image_args['height'] ) {
	872	+ $photon_args['h'] = $image_args['height'];
	873	+ } elseif ( 0 === $image_args['height'] && 0 < $image_args['width'] ) {
	874	+ $photon_args['w'] = $image_args['width'];
	875	+ }
	876	+ } else {
	877	+ $image_meta = wp_get_attachment_metadata( $attachment_id );
	878	+ if ( ( 'resize' === $transform ) && $image_meta ) {
	879	+ if ( isset( $image_meta['width'] ) && isset( $image_meta['height'] ) ) {
	880	+ // Lets make sure that we don't upscale images since wp never upscales them as well.
	881	+ $smaller_width = ( ( $image_meta['width'] < $image_args['width'] ) ? $image_meta['width'] : $image_args['width'] );
	882	+ $smaller_height = ( ( $image_meta['height'] < $image_args['height'] ) ? $image_meta['height'] : $image_args['height'] );
	883	+
	884	+ $photon_args[ $transform ] = $smaller_width . ',' . $smaller_height;
	885	+ }
	886	+ } else {
	887	+ $photon_args[ $transform ] = $image_args['width'] . ',' . $image_args['height'];
	888	+ }
	889	+ }
	890	+
	891	+ /**
	892	+ * Filter the Photon Arguments added to an image when going through Photon, when that image size is a string.
	893	+ * Image size will be a string (e.g. "full", "medium") when it is known to WordPress.
	894	+ *
	895	+ * @module photon
	896	+ *
	897	+ * @since 2.0.0
	898	+ *
	899	+ * @param array $photon_args Array of Photon arguments.
	900	+ * @param array $args {
	901	+ * Array of image details.
	902	+ *
	903	+ * @type array $image_args Array of Image arguments (width, height, crop).
	904	+ * @type string $image_url Image URL.
	905	+ * @type int $attachment_id Attachment ID of the image.
	906	+ * @type string|int $size Image size. Can be a string (name of the image size, e.g. full) or an integer.
	907	+ * @type string $transform Value can be resize or fit.
	908	+ * @see https://developer.wordpress.com/docs/photon/api
	909	+ * }
	910	+ */
	911	+ $photon_args = apply_filters( 'jetpack_photon_image_downsize_string', $photon_args, compact( 'image_args', 'image_url', 'attachment_id', 'size', 'transform' ) );
	912	+
	913	+ // Generate Photon URL.
	914	+ $image = array(
	915	+ Image_CDN_Core::cdn_url( $image_url, $photon_args ),
	916	+ $has_size_meta ? $image_args['width'] : false,
	917	+ $has_size_meta ? $image_args['height'] : false,
	918	+ $intermediate,
	919	+ );
	920	+ } elseif ( is_array( $size ) ) {
	921	+ // Pull width and height values from the provided array, if possible.
	922	+ $width = isset( $size[0] ) ? (int) $size[0] : false;
	923	+ $height = isset( $size[1] ) ? (int) $size[1] : false;
	924	+
	925	+ // Don't bother if necessary parameters aren't passed.
	926	+ if ( ! $width || ! $height ) {
	927	+ return $image;
	928	+ }
	929	+
	930	+ $image_meta = wp_get_attachment_metadata( $attachment_id );
	931	+ if ( isset( $image_meta['width'] ) && isset( $image_meta['height'] ) ) {
	932	+ $image_resized = image_resize_dimensions( $image_meta['width'], $image_meta['height'], $width, $height );
	933	+
	934	+ if ( $image_resized ) { // This could be false when the requested image size is larger than the full-size image.
	935	+ $width = $image_resized[6];
	936	+ $height = $image_resized[7];
	937	+ } else {
	938	+ $width = $image_meta['width'];
	939	+ $height = $image_meta['height'];
	940	+ }
	941	+
	942	+ $has_size_meta = true;
	943	+ }
	944	+
	945	+ list( $width, $height ) = image_constrain_size_for_editor( $width, $height, $size );
	946	+
	947	+ // Expose arguments to a filter before passing to Photon.
	948	+ $photon_args = array(
	949	+ 'fit' => $width . ',' . $height,
	950	+ );
	951	+
	952	+ /**
	953	+ * Filter the Photon Arguments added to an image when going through Photon,
	954	+ * when the image size is an array of height and width values.
	955	+ *
	956	+ * @module photon
	957	+ *
	958	+ * @since 2.0.0
	959	+ *
	960	+ * @param array $photon_args Array of Photon arguments.
	961	+ * @param array $args {
	962	+ * Array of image details.
	963	+ *
	964	+ * @type $width Image width.
	965	+ * @type height Image height.
	966	+ * @type $image_url Image URL.
	967	+ * @type $attachment_id Attachment ID of the image.
	968	+ * }
	969	+ */
	970	+ $photon_args = apply_filters( 'jetpack_photon_image_downsize_array', $photon_args, compact( 'width', 'height', 'image_url', 'attachment_id' ) );
	971	+
	972	+ // Generate Photon URL.
	973	+ $image = array(
	974	+ Image_CDN_Core::cdn_url( $image_url, $photon_args ),
	975	+ $has_size_meta ? $width : false,
	976	+ $has_size_meta ? $height : false,
	977	+ $intermediate,
	978	+ );
	979	+ }
	980	+ }
	981	+
	982	+ return $image;
	983	+ }
	984	+
	985	+ /**
	986	+ * Filters an array of image `srcset` values, replacing each URL with its Photon equivalent.
	987	+ *
	988	+ * @param array $sources An array of image urls and widths.
	989	+ * @param array $size_array The size array for srcset.
	990	+ * @param string $image_src The image src attribute.
	991	+ * @param array $image_meta The image meta.
	992	+ * @param int $attachment_id Attachment ID.
	993	+ *
	994	+ * @uses self::validate_image_url, Image_CDN_Core::cdn_url
	995	+ * @uses Image_CDN::strip_image_dimensions_maybe, Image_CDN_Core::get_jetpack_content_width
	996	+ *
	997	+ * @return array An array of Photon image urls and widths.
	998	+ */
	999	+ public function filter_srcset_array( $sources = array(), $size_array = array(), $image_src = '', $image_meta = array(), $attachment_id = 0 ) {
	1000	+ // Check if we are supposed to skip the main image.
	1001	+ if ( $this->photon_should_skip_image( $image_src ) ) {
	1002	+ return $sources;
	1003	+ }
	1004	+
	1005	+ if ( ! is_array( $sources ) || array() === $sources ) {
	1006	+ return $sources;
	1007	+ }
	1008	+ $upload_dir = wp_get_upload_dir();
	1009	+
	1010	+ foreach ( $sources as $i => $source ) {
	1011	+ if ( ! self::validate_image_url( $source['url'] ) ) {
	1012	+ continue;
	1013	+ }
	1014	+
	1015	+ /** This filter is already documented in class-image-cdn.php */
	1016	+ if ( apply_filters( 'jetpack_photon_skip_image', false, $source['url'], $source ) ) {
	1017	+ continue;
	1018	+ }
	1019	+
	1020	+ $url = $source['url'];
	1021	+ list( $width, $height ) = self::parse_dimensions_from_filename( $url );
	1022	+
	1023	+ // It's quicker to get the full size with the data we have already, if available.
	1024	+ if ( ! empty( $attachment_id ) ) {
	1025	+ $url = wp_get_attachment_url( $attachment_id );
	1026	+ } else {
	1027	+ $url = self::strip_image_dimensions_maybe( $url );
	1028	+ }
	1029	+
	1030	+ $args = array();
	1031	+ if ( 'w' === $source['descriptor'] ) {
	1032	+ if ( $height && ( (int) $source['value'] === $width ) ) {
	1033	+ $args['resize'] = $width . ',' . $height;
	1034	+ } else {
	1035	+ $args['w'] = $source['value'];
	1036	+ }
	1037	+ }
	1038	+
	1039	+ $sources[ $i ]['url'] = Image_CDN_Core::cdn_url( $url, $args );
	1040	+ }
	1041	+
	1042	+ /**
	1043	+ * At this point, $sources is the original srcset with Photonized URLs.
	1044	+ * Now, we're going to construct additional sizes based on multiples of the content_width.
	1045	+ * This will reduce the gap between the largest defined size and the original image.
	1046	+ */
	1047	+
	1048	+ /**
	1049	+ * Filter the multiplier Photon uses to create new srcset items.
	1050	+ * Return false to short-circuit and bypass auto-generation.
	1051	+ *
	1052	+ * @module photon
	1053	+ *
	1054	+ * @since 4.0.4
	1055	+ *
	1056	+ * @param array|bool $multipliers Array of multipliers to use or false to bypass.
	1057	+ */
	1058	+ $multipliers = apply_filters( 'jetpack_photon_srcset_multipliers', array( 2, 3 ) );
	1059	+ $url = trailingslashit( $upload_dir['baseurl'] ) . $image_meta['file'];
	1060	+
	1061	+ if (
	1062	+ /** Short-circuit via jetpack_photon_srcset_multipliers filter. */
	1063	+ is_array( $multipliers )
	1064	+ /** This filter is already documented in class-image-cdn.php */
	1065	+ && ! apply_filters( 'jetpack_photon_skip_image', false, $url, null )
	1066	+ /** Verify basic meta is intact. */
	1067	+ && isset( $image_meta['width'] ) && isset( $image_meta['height'] ) && isset( $image_meta['file'] )
	1068	+ /** Verify we have the requested width/height. */
	1069	+ && isset( $size_array[0] ) && isset( $size_array[1] )
	1070	+ ) {
	1071	+
	1072	+ $fullwidth = $image_meta['width'];
	1073	+ $fullheight = $image_meta['height'];
	1074	+ $reqwidth = $size_array[0];
	1075	+ $reqheight = $size_array[1];
	1076	+
	1077	+ $constrained_size = wp_constrain_dimensions( $fullwidth, $fullheight, $reqwidth );
	1078	+ $expected_size = array( $reqwidth, $reqheight );
	1079	+
	1080	+ if ( abs( $constrained_size[0] - $expected_size[0] ) <= 1 && abs( $constrained_size[1] - $expected_size[1] ) <= 1 ) {
	1081	+ $crop = 'soft';
	1082	+ $base = Image_CDN_Core::get_jetpack_content_width() ? Image_CDN_Core::get_jetpack_content_width() : 1000; // Provide a default width if none set by the theme.
	1083	+ } else {
	1084	+ $crop = 'hard';
	1085	+ $base = $reqwidth;
	1086	+ }
	1087	+
	1088	+ $currentwidths = array_keys( $sources );
	1089	+ $newsources = null;
	1090	+
	1091	+ foreach ( $multipliers as $multiplier ) {
	1092	+
	1093	+ $newwidth = (int) round( $base * $multiplier );
	1094	+ foreach ( $currentwidths as $currentwidth ) {
	1095	+ // If a new width would be within 100 pixes of an existing one or larger than the full size image, skip.
	1096	+ if ( abs( $currentwidth - $newwidth ) < 50 || ( $newwidth > $fullwidth ) ) {
	1097	+ continue 2; // Bump out back to the $multipliers as $multiplier.
	1098	+ }
	1099	+ } //end foreach ( $currentwidths as $currentwidth ){
	1100	+
	1101	+ if ( 'soft' === $crop ) {
	1102	+ $args = array(
	1103	+ 'w' => $newwidth,
	1104	+ );
	1105	+ } else { // hard crop, e.g. add_image_size( 'example', 200, 200, true ).
	1106	+ $args = array(
	1107	+ 'zoom' => $multiplier,
	1108	+ 'resize' => $reqwidth . ',' . $reqheight,
	1109	+ );
	1110	+ }
	1111	+
	1112	+ $newsources[ $newwidth ] = array(
	1113	+ 'url' => Image_CDN_Core::cdn_url( $url, $args ),
	1114	+ 'descriptor' => 'w',
	1115	+ 'value' => $newwidth,
	1116	+ );
	1117	+ } //end foreach ( $multipliers as $multiplier )
	1118	+ if ( is_array( $newsources ) ) {
	1119	+ $sources = array_replace( $sources, $newsources );
	1120	+ }
	1121	+ } //end if isset( $image_meta['width'] ) && isset( $image_meta['file'] ) )
	1122	+
	1123	+ return $sources;
	1124	+ }
	1125	+
	1126	+ /**
	1127	+ * Filters an array of image `sizes` values, using $content_width instead of image's full size.
	1128	+ *
	1129	+ * @param array $sizes An array of media query breakpoints.
	1130	+ * @param array $size Width and height of the image.
	1131	+ * @param string $image_url The image URL.
	1132	+ *
	1133	+ * @uses Jetpack::get_content_width
	1134	+ * @return array An array of media query breakpoints.
	1135	+ */
	1136	+ public function filter_sizes( $sizes, $size, $image_url ) {
	1137	+ if ( $this->photon_should_skip_image( $image_url ) ) {
	1138	+ return $sizes;
	1139	+ }
	1140	+
	1141	+ if ( ! doing_filter( 'the_content' ) ) {
	1142	+ return $sizes;
	1143	+ }
	1144	+ $content_width = Image_CDN_Core::get_jetpack_content_width();
	1145	+ if ( ! $content_width ) {
	1146	+ $content_width = 1000;
	1147	+ }
	1148	+
	1149	+ if ( ( is_array( $size ) && $size[0] < $content_width ) ) {
	1150	+ return $sizes;
	1151	+ }
	1152	+
	1153	+ return sprintf( '(max-width: %1$dpx) 100vw, %1$dpx', $content_width );
	1154	+ }
	1155	+
	1156	+ /**
	1157	+ * Whether to skip the image from being processed by Photon.
	1158	+ *
	1159	+ * @param string $image_url The image URL.
	1160	+ *
	1161	+ * @return bool Whether to skip the image.
	1162	+ */
	1163	+ private function photon_should_skip_image( $image_url ) {
	1164	+ return apply_filters( 'jetpack_photon_skip_image', false, $image_url, null );
	1165	+ }
	1166	+
	1167	+ /**
	1168	+ * * GENERAL FUNCTIONS
	1169	+ **/
	1170	+
	1171	+ /**
	1172	+ * Ensure image URL is valid for Photon.
	1173	+ * 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.
	1174	+ *
	1175	+ * @param string $url Image URL.
	1176	+ * @uses wp_parse_args
	1177	+ * @return bool
	1178	+ */
	1179	+ protected static function validate_image_url( $url ) {
	1180	+ $parsed_url = wp_parse_url( $url );
	1181	+
	1182	+ if ( ! $parsed_url ) {
	1183	+ return false;
	1184	+ }
	1185	+
	1186	+ // Parse URL and ensure needed keys exist, since the array returned by `wp_parse_url` only includes the URL components it finds.
	1187	+ $url_info = wp_parse_args(
	1188	+ $parsed_url,
	1189	+ array(
	1190	+ 'scheme' => null,
	1191	+ 'host' => null,
	1192	+ 'port' => null,
	1193	+ 'path' => null,
	1194	+ )
	1195	+ );
	1196	+
	1197	+ // Bail if scheme isn't http or port is set that isn't port 80.
	1198	+ if (
	1199	+ ( 'http' !== $url_info['scheme'] || ! in_array( $url_info['port'], array( 80, null ), true ) ) &&
	1200	+ /**
	1201	+ * Allow Photon to fetch images that are served via HTTPS.
	1202	+ *
	1203	+ * @module photon
	1204	+ *
	1205	+ * @since 2.4.0
	1206	+ * @since 3.9.0 Default to false.
	1207	+ *
	1208	+ * @param bool $reject_https Should Photon ignore images using the HTTPS scheme. Default to false.
	1209	+ */
	1210	+ apply_filters( 'jetpack_photon_reject_https', false )
	1211	+ ) {
	1212	+ return false;
	1213	+ }
	1214	+
	1215	+ // Bail if no host is found.
	1216	+ if ( $url_info['host'] === null ) {
	1217	+ return false;
	1218	+ }
	1219	+
	1220	+ // Bail if the image already went through Photon.
	1221	+ if ( preg_match( '#^i[\d]{1}.wp.com$#i', $url_info['host'] ) ) {
	1222	+ return false;
	1223	+ }
	1224	+
	1225	+ // Bail if no path is found.
	1226	+ if ( $url_info['path'] === null ) {
	1227	+ return false;
	1228	+ }
	1229	+
	1230	+ // Ensure image extension is acceptable.
	1231	+ if ( ! in_array( strtolower( pathinfo( $url_info['path'], PATHINFO_EXTENSION ) ), self::$extensions, true ) ) {
	1232	+ return false;
	1233	+ }
	1234	+
	1235	+ // If we got this far, we should have an acceptable image URL
	1236	+ // But let folks filter to decline if they prefer.
	1237	+ /**
	1238	+ * Overwrite the results of the validation steps an image goes through before to be considered valid to be used by Photon.
	1239	+ *
	1240	+ * @module photon
	1241	+ *
	1242	+ * @since 3.0.0
	1243	+ *
	1244	+ * @param bool true Is the image URL valid and can it be used by Photon. Default to true.
	1245	+ * @param string $url Image URL.
	1246	+ * @param array $parsed_url Array of information about the image.
	1247	+ */
	1248	+ return apply_filters( 'photon_validate_image_url', true, $url, $parsed_url );
	1249	+ }
	1250	+
	1251	+ /**
	1252	+ * Checks if the file exists before it passes the file to photon.
	1253	+ *
	1254	+ * @param string $src The image URL.
	1255	+ * @return string
	1256	+ **/
	1257	+ public static function strip_image_dimensions_maybe( $src ) {
	1258	+ $stripped_src = $src;
	1259	+
	1260	+ // Build URL, first removing WP's resized string so we pass the original image to Photon.
	1261	+ if ( preg_match( '#(-\d+x\d+)\.(' . implode( '|', self::$extensions ) . '){1}$#i', $src, $src_parts ) ) {
	1262	+ $stripped_src = str_replace( $src_parts[1], '', $src );
	1263	+ $upload_dir = wp_get_upload_dir();
	1264	+
	1265	+ // Extracts the file path to the image minus the base url.
	1266	+ $file_path = substr( $stripped_src, strlen( $upload_dir['baseurl'] ) );
	1267	+
	1268	+ if ( file_exists( $upload_dir['basedir'] . $file_path ) ) {
	1269	+ $src = $stripped_src;
	1270	+ }
	1271	+ }
	1272	+
	1273	+ return $src;
	1274	+ }
	1275	+
	1276	+ /**
	1277	+ * Provide an array of available image sizes and corresponding dimensions.
	1278	+ * Similar to get_intermediate_image_sizes() except that it includes image sizes' dimensions, not just their names.
	1279	+ *
	1280	+ * @global $wp_additional_image_sizes
	1281	+ * @uses get_option
	1282	+ * @return array
	1283	+ */
	1284	+ protected static function image_sizes() {
	1285	+ if ( null === self::$image_sizes ) {
	1286	+ global $_wp_additional_image_sizes;
	1287	+
	1288	+ // Populate an array matching the data structure of $_wp_additional_image_sizes so we have a consistent structure for image sizes.
	1289	+ $images = array(
	1290	+ 'thumb' => array(
	1291	+ 'width' => (int) get_option( 'thumbnail_size_w' ),
	1292	+ 'height' => (int) get_option( 'thumbnail_size_h' ),
	1293	+ 'crop' => (bool) get_option( 'thumbnail_crop' ),
	1294	+ ),
	1295	+ 'medium' => array(
	1296	+ 'width' => (int) get_option( 'medium_size_w' ),
	1297	+ 'height' => (int) get_option( 'medium_size_h' ),
	1298	+ 'crop' => false,
	1299	+ ),
	1300	+ 'medium_large' => array(
	1301	+ 'width' => (int) get_option( 'medium_large_size_w' ),
	1302	+ 'height' => (int) get_option( 'medium_large_size_h' ),
	1303	+ 'crop' => false,
	1304	+ ),
	1305	+ 'large' => array(
	1306	+ 'width' => (int) get_option( 'large_size_w' ),
	1307	+ 'height' => (int) get_option( 'large_size_h' ),
	1308	+ 'crop' => false,
	1309	+ ),
	1310	+ 'full' => array(
	1311	+ 'width' => null,
	1312	+ 'height' => null,
	1313	+ 'crop' => false,
	1314	+ ),
	1315	+ );
	1316	+
	1317	+ // Compatibility mapping as found in wp-includes/media.php.
	1318	+ $images['thumbnail'] = $images['thumb'];
	1319	+
	1320	+ // Update class variable, merging in $_wp_additional_image_sizes if any are set.
	1321	+ if ( is_array( $_wp_additional_image_sizes ) && ! empty( $_wp_additional_image_sizes ) ) {
	1322	+ self::$image_sizes = array_merge( $images, $_wp_additional_image_sizes );
	1323	+ } else {
	1324	+ self::$image_sizes = $images;
	1325	+ }
	1326	+ }
	1327	+
	1328	+ return is_array( self::$image_sizes ) ? self::$image_sizes : array();
	1329	+ }
	1330	+
	1331	+ /**
	1332	+ * Find registered image size name if it exists.
	1333	+ *
	1334	+ * @param string|int|int[] $size Image size name if registered, or false if not.
	1335	+ */
	1336	+ protected static function find_registered_image_size( $size ) {
	1337	+ $sizes = self::image_sizes();
	1338	+
	1339	+ // WP states that `add_image_size()` should use a string for the name, but doesn't enforce that.
	1340	+ if ( ( is_string( $size ) || is_int( $size ) ) && array_key_exists( $size, self::image_sizes() ) ) {
	1341	+ return $size;
	1342	+ }
	1343	+
	1344	+ if ( is_array( $size ) && isset( $size[0] ) && isset( $size[1] ) ) {
	1345	+ foreach ( $sizes as $name => $args ) {
	1346	+ if ( $args['width'] === $size[0] && $args['height'] === $size[1] ) {
	1347	+ return $name;
	1348	+ }
	1349	+ }
	1350	+ }
	1351	+
	1352	+ return false;
	1353	+ }
	1354	+
	1355	+ /**
	1356	+ * Determine if image_downsize should utilize Photon via REST API.
	1357	+ *
	1358	+ * The WordPress Block Editor (Gutenberg) and other REST API consumers using the wp/v2/media endpoint, especially in the "edit"
	1359	+ * context is more akin to the is_admin usage of Photon (see filter_image_downsize). Since consumers are trying to edit content in posts,
	1360	+ * Photon should not fire as it will fire later on display. By aborting an attempt to Photonize an image here, we
	1361	+ * prevents issues like https://github.com/Automattic/jetpack/issues/10580 .
	1362	+ *
	1363	+ * To determine if we're using the wp/v2/media endpoint, we hook onto the `rest_request_before_callbacks` filter and
	1364	+ * if determined we are using it in the edit context, we'll false out the `jetpack_photon_override_image_downsize` filter.
	1365	+ *
	1366	+ * @see Image_CDN::filter_image_downsize()
	1367	+ *
	1368	+ * @param null|\WP_Error $response REST API response.
	1369	+ * @param array $endpoint_data Endpoint data. Not used, but part of the filter.
	1370	+ * @param \WP_REST_Request $request Request used to generate the response.
	1371	+ *
	1372	+ * @return null|\WP_Error The original response object without modification.
	1373	+ */
	1374	+ public function should_rest_photon_image_downsize( $response, $endpoint_data, $request ) {
	1375	+ if ( ! is_a( $request, '\WP_REST_Request' ) ) {
	1376	+ return $response; // Something odd is happening. Do nothing and return the response.
	1377	+ }
	1378	+
	1379	+ if ( is_wp_error( $response ) ) {
	1380	+ // If we're going to return an error, we don't need to do anything with Photon.
	1381	+ return $response;
	1382	+ }
	1383	+
	1384	+ $this->should_rest_photon_image_downsize_override( $request );
	1385	+
	1386	+ return $response;
	1387	+ }
	1388	+
	1389	+ /**
	1390	+ * Helper function to check if a WP_REST_Request is the media endpoint in the edit context.
	1391	+ *
	1392	+ * @param \WP_REST_Request $request The current REST request.
	1393	+ */
	1394	+ private function should_rest_photon_image_downsize_override( \WP_REST_Request $request ) {
	1395	+ $route = $request->get_route();
	1396	+
	1397	+ if (
	1398	+ (
	1399	+ str_contains( $route, 'wp/v2/media' )
	1400	+ && 'edit' === $request->get_param( 'context' )
	1401	+ )
	1402	+ || str_contains( $route, 'wpcom/v2/external-media/copy' )
	1403	+ || (bool) $request->get_header( 'x-wp-api-fetch-from-editor' )
	1404	+ ) {
	1405	+ // Don't use `__return_true()`: Use something unique. See ::_override_image_downsize_in_rest_edit_context()
	1406	+ // Late execution to avoid conflict with other plugins as we really don't want to run in this situation.
	1407	+ add_filter(
	1408	+ 'jetpack_photon_override_image_downsize',
	1409	+ array(
	1410	+ $this,
	1411	+ 'override_image_downsize_in_rest_edit_context',
	1412	+ ),
	1413	+ 999999
	1414	+ );
	1415	+ }
	1416	+ }
	1417	+
	1418	+ /**
	1419	+ * Brings in should_rest_photon_image_downsize for the rest_after_insert_attachment hook.
	1420	+ *
	1421	+ * @param \WP_Post $attachment Inserted or updated attachment object.
	1422	+ * @param \WP_REST_Request $request Request object.
	1423	+ */
	1424	+ public function should_rest_photon_image_downsize_insert_attachment( \WP_Post $attachment, \WP_REST_Request $request ) {
	1425	+ if ( ! is_a( $request, '\WP_REST_Request' ) ) {
	1426	+ // Something odd is happening.
	1427	+ return;
	1428	+ }
	1429	+
	1430	+ $this->should_rest_photon_image_downsize_override( $request );
	1431	+ }
	1432	+
	1433	+ /**
	1434	+ * Remove the override we may have added in ::should_rest_photon_image_downsize()
	1435	+ * Since ::_override_image_downsize_in_rest_edit_context() is only
	1436	+ * every used here, we can always remove it without ever worrying
	1437	+ * about breaking any other configuration.
	1438	+ *
	1439	+ * @param mixed $response REST API Response.
	1440	+ * @return mixed Unchanged $response
	1441	+ */
	1442	+ public function cleanup_rest_photon_image_downsize( $response ) {
	1443	+ remove_filter(
	1444	+ 'jetpack_photon_override_image_downsize',
	1445	+ array(
	1446	+ $this,
	1447	+ 'override_image_downsize_in_rest_edit_context',
	1448	+ ),
	1449	+ 999999
	1450	+ );
	1451	+ return $response;
	1452	+ }
	1453	+
	1454	+ /**
	1455	+ * Used internally by ::should_rest_photon_image_downsize() to not photonize
	1456	+ * image URLs in ?context=edit REST requests.
	1457	+ * MUST NOT be used anywhere else.
	1458	+ * We use a unique function instead of __return_true so that we can clean up
	1459	+ * after ourselves without breaking anyone else's filters.
	1460	+ *
	1461	+ * @internal
	1462	+ * @return true
	1463	+ */
	1464	+ public function override_image_downsize_in_rest_edit_context() {
	1465	+ return true;
	1466	+ }
	1467	+
	1468	+ /**
	1469	+ * Return whether the current page is AMP.
	1470	+ *
	1471	+ * This is only present for the sake of WordPress.com where the Jetpack_AMP_Support
	1472	+ * class does not yet exist. This mehod may only be called at the wp action or later.
	1473	+ *
	1474	+ * @return bool Whether AMP page.
	1475	+ */
	1476	+ private static function is_amp_endpoint() {
	1477	+ return class_exists( '\Jetpack_AMP_Support' ) && \Jetpack_AMP_Support::is_amp_request();
	1478	+ }
	1479	+
	1480	+ /**
	1481	+ * Get the list of supported image extensions
	1482	+ *
	1483	+ * @return string[] Array of supported extensions
	1484	+ */
	1485	+ public static function get_supported_extensions() {
	1486	+ return self::$extensions;
	1487	+ }
	1488	+}