class.jetpack-post-images.php — Jetpack – WP Security, Backup, Speed, & Growth 8.2.1

jetpack / class.jetpack-post-images.php

jetpack Last commit date

class.jetpack-post-images.php

884 lines

1	<?php
2
3	/**
4	* Useful for finding an image to display alongside/in representation of a specific post.
5	*
6	* Includes a few different methods, all of which return a similar-format array containing
7	* details of any images found. Everything can (should) be called statically, it's just a
8	* function-bucket. You can also call Jetpack_PostImages::get_image() to cycle through all of the methods until
9	* one of them finds something useful.
10	*
11	* This file is included verbatim in Jetpack
12	*/
13	class Jetpack_PostImages {
14	/**
15	* If a slideshow is embedded within a post, then parse out the images involved and return them
16	*/
17	static function from_slideshow( $post_id, $width = 200, $height = 200 ) {
18	$images = array();
19
20	$post = get_post( $post_id );
21
22	if ( ! $post ) {
23	return $images;
24	}
25
26	if ( ! empty( $post->post_password ) ) {
27	return $images;
28	}
29
30	if ( false === has_shortcode( $post->post_content, 'slideshow' ) ) {
31	return $images; // no slideshow - bail
32	}
33
34	$permalink = get_permalink( $post->ID );
35
36	// Mechanic: Somebody set us up the bomb
37	$old_post = $GLOBALS['post'];
38	$GLOBALS['post'] = $post;
39	$old_shortcodes = $GLOBALS['shortcode_tags'];
40	$GLOBALS['shortcode_tags'] = array( 'slideshow' => $old_shortcodes['slideshow'] );
41
42	// Find all the slideshows
43	preg_match_all( '/' . get_shortcode_regex() . '/sx', $post->post_content, $slideshow_matches, PREG_SET_ORDER );
44
45	ob_start(); // The slideshow shortcode handler calls wp_print_scripts and wp_print_styles... not too happy about that
46
47	foreach ( $slideshow_matches as $slideshow_match ) {
48	$slideshow = do_shortcode_tag( $slideshow_match );
49	if ( false === $pos = stripos( $slideshow, 'jetpack-slideshow' ) ) { // must be something wrong - or we changed the output format in which case none of the following will work
50	continue;
51	}
52	$start = strpos( $slideshow, '[', $pos );
53	$end = strpos( $slideshow, ']', $start );
54	$post_images = json_decode( wp_specialchars_decode( str_replace( "'", '"', substr( $slideshow, $start, $end - $start + 1 ) ), ENT_QUOTES ) ); // parse via JSON
55	// If the JSON didn't decode don't try and act on it.
56	if ( is_array( $post_images ) ) {
57	foreach ( $post_images as $post_image ) {
58	if ( ! $post_image_id = absint( $post_image->id ) ) {
59	continue;
60	}
61
62	$meta = wp_get_attachment_metadata( $post_image_id );
63
64	// Must be larger than 200x200 (or user-specified)
65	if ( ! isset( $meta['width'] ) \|\| $meta['width'] < $width ) {
66	continue;
67	}
68	if ( ! isset( $meta['height'] ) \|\| $meta['height'] < $height ) {
69	continue;
70	}
71
72	$url = wp_get_attachment_url( $post_image_id );
73
74	$images[] = array(
75	'type' => 'image',
76	'from' => 'slideshow',
77	'src' => $url,
78	'src_width' => $meta['width'],
79	'src_height' => $meta['height'],
80	'href' => $permalink,
81	);
82	}
83	}
84	}
85	ob_end_clean();
86
87	// Operator: Main screen turn on
88	$GLOBALS['shortcode_tags'] = $old_shortcodes;
89	$GLOBALS['post'] = $old_post;
90
91	return $images;
92	}
93
94	/**
95	* If a gallery is detected, then get all the images from it.
96	*/
97	static function from_gallery( $post_id ) {
98	$images = array();
99
100	$post = get_post( $post_id );
101
102	if ( ! $post ) {
103	return $images;
104	}
105
106	if ( ! empty( $post->post_password ) ) {
107	return $images;
108	}
109
110	$permalink = get_permalink( $post->ID );
111
112	/**
113	* Juggle global post object because the gallery shortcode uses the
114	* global object.
115	*
116	* See core ticket:
117	* https://core.trac.wordpress.org/ticket/39304
118	*/
119	if ( isset( $GLOBALS['post'] ) ) {
120	$juggle_post = $GLOBALS['post'];
121	$GLOBALS['post'] = $post;
122	$galleries = get_post_galleries( $post->ID, false );
123	$GLOBALS['post'] = $juggle_post;
124	} else {
125	$GLOBALS['post'] = $post;
126	$galleries = get_post_galleries( $post->ID, false );
127	unset( $GLOBALS['post'] );
128	}
129
130	foreach ( $galleries as $gallery ) {
131	if ( isset( $gallery['type'] ) && 'slideshow' === $gallery['type'] && ! empty( $gallery['ids'] ) ) {
132	$image_ids = explode( ',', $gallery['ids'] );
133	$image_size = isset( $gallery['size'] ) ? $gallery['size'] : 'thumbnail';
134	foreach ( $image_ids as $image_id ) {
135	$image = wp_get_attachment_image_src( $image_id, $image_size );
136	if ( ! empty( $image[0] ) ) {
137	list( $raw_src ) = explode( '?', $image[0] ); // pull off any Query string (?w=250)
138	$raw_src = wp_specialchars_decode( $raw_src ); // rawify it
139	$raw_src = esc_url_raw( $raw_src ); // clean it
140	$images[] = array(
141	'type' => 'image',
142	'from' => 'gallery',
143	'src' => $raw_src,
144	'href' => $permalink,
145	);
146	}
147	}
148	} elseif ( ! empty( $gallery['src'] ) ) {
149	foreach ( $gallery['src'] as $src ) {
150	list( $raw_src ) = explode( '?', $src ); // pull off any Query string (?w=250)
151	$raw_src = wp_specialchars_decode( $raw_src ); // rawify it
152	$raw_src = esc_url_raw( $raw_src ); // clean it
153	$images[] = array(
154	'type' => 'image',
155	'from' => 'gallery',
156	'src' => $raw_src,
157	'href' => $permalink,
158	);
159	}
160	}
161	}
162
163	return $images;
164	}
165
166	/**
167	* Get attachment images for a specified post and return them. Also make sure
168	* their dimensions are at or above a required minimum.
169	*/
170	static function from_attachment( $post_id, $width = 200, $height = 200 ) {
171	$images = array();
172
173	$post = get_post( $post_id );
174
175	if ( ! empty( $post->post_password ) ) {
176	return $images;
177	}
178
179	$post_images = get_posts(
180	array(
181	'post_parent' => $post_id, // Must be children of post
182	'numberposts' => 5, // No more than 5
183	'post_type' => 'attachment', // Must be attachments
184	'post_mime_type' => 'image', // Must be images
185	'suppress_filters' => false,
186	)
187	);
188
189	if ( ! $post_images ) {
190	return $images;
191	}
192
193	$permalink = get_permalink( $post_id );
194
195	foreach ( $post_images as $post_image ) {
196	$current_image = self::get_attachment_data( $post_image->ID, $permalink, $width, $height );
197	if ( false !== $current_image ) {
198	$images[] = $current_image;
199	}
200	}
201
202	/*
203	* We only want to pass back attached images that were actually inserted.
204	* We can load up all the images found in the HTML source and then
205	* compare URLs to see if an image is attached AND inserted.
206	*/
207	$html_images = self::from_html( $post_id );
208	$inserted_images = array();
209
210	foreach ( $html_images as $html_image ) {
211	$src = wp_parse_url( $html_image['src'] );
212	// strip off any query strings from src
213	if ( ! empty( $src['scheme'] ) && ! empty( $src['host'] ) ) {
214	$inserted_images[] = $src['scheme'] . '://' . $src['host'] . $src['path'];
215	} elseif ( ! empty( $src['host'] ) ) {
216	$inserted_images[] = set_url_scheme( 'http://' . $src['host'] . $src['path'] );
217	} else {
218	$inserted_images[] = site_url( '/' ) . $src['path'];
219	}
220	}
221	foreach ( $images as $i => $image ) {
222	if ( ! in_array( $image['src'], $inserted_images ) ) {
223	unset( $images[ $i ] );
224	}
225	}
226
227	return $images;
228	}
229
230	/**
231	* Check if a Featured Image is set for this post, and return it in a similar
232	* format to the other images?_from_*() methods.
233	*
234	* @param int $post_id The post ID to check
235	* @return Array containing details of the Featured Image, or empty array if none.
236	*/
237	static function from_thumbnail( $post_id, $width = 200, $height = 200 ) {
238	$images = array();
239
240	$post = get_post( $post_id );
241
242	if ( ! empty( $post->post_password ) ) {
243	return $images;
244	}
245
246	if ( 'attachment' === get_post_type( $post ) && wp_attachment_is_image( $post ) ) {
247	$thumb = $post_id;
248	} else {
249	$thumb = get_post_thumbnail_id( $post );
250	}
251
252	if ( $thumb ) {
253	$meta = wp_get_attachment_metadata( $thumb );
254	// Must be larger than requested minimums
255	if ( ! isset( $meta['width'] ) \|\| $meta['width'] < $width ) {
256	return $images;
257	}
258	if ( ! isset( $meta['height'] ) \|\| $meta['height'] < $height ) {
259	return $images;
260	}
261
262	$too_big = ( ( ! empty( $meta['width'] ) && $meta['width'] > 1200 ) \|\| ( ! empty( $meta['height'] ) && $meta['height'] > 1200 ) );
263
264	if (
265	$too_big &&
266	(
267	( method_exists( 'Jetpack', 'is_module_active' ) && Jetpack::is_module_active( 'photon' ) ) \|\|
268	( defined( 'IS_WPCOM' ) && IS_WPCOM )
269	)
270	) {
271	$img_src = wp_get_attachment_image_src( $thumb, array( 1200, 1200 ) );
272	} else {
273	$img_src = wp_get_attachment_image_src( $thumb, 'full' );
274	}
275	if ( ! is_array( $img_src ) ) {
276	// If wp_get_attachment_image_src returns false but we know that there should be an image that could be used.
277	// we try a bit harder and user the data that we have.
278	$thumb_post_data = get_post( $thumb );
279	$img_src = array( $thumb_post_data->guid, $meta['width'], $meta['height'] );
280	}
281
282	$url = $img_src[0];
283	$images = array(
284	array( // Other methods below all return an array of arrays
285	'type' => 'image',
286	'from' => 'thumbnail',
287	'src' => $url,
288	'src_width' => $img_src[1],
289	'src_height' => $img_src[2],
290	'href' => get_permalink( $thumb ),
291	'alt_text' => self::get_alt_text( $thumb ),
292	),
293	);
294
295	}
296
297	if ( empty( $images ) && ( defined( 'IS_WPCOM' ) && IS_WPCOM ) ) {
298	$meta_thumbnail = get_post_meta( $post_id, '_jetpack_post_thumbnail', true );
299	if ( ! empty( $meta_thumbnail ) ) {
300	if ( ! isset( $meta_thumbnail['width'] ) \|\| $meta_thumbnail['width'] < $width ) {
301	return $images;
302	}
303
304	if ( ! isset( $meta_thumbnail['height'] ) \|\| $meta_thumbnail['height'] < $height ) {
305	return $images;
306	}
307
308	$images = array(
309	array( // Other methods below all return an array of arrays
310	'type' => 'image',
311	'from' => 'thumbnail',
312	'src' => $meta_thumbnail['URL'],
313	'src_width' => $meta_thumbnail['width'],
314	'src_height' => $meta_thumbnail['height'],
315	'href' => $meta_thumbnail['URL'],
316	'alt_text' => self::get_alt_text( $thumb ),
317	),
318	);
319	}
320	}
321
322	return $images;
323	}
324
325	/**
326	* Get images from Gutenberg Image blocks.
327	*
328	* @since 6.9.0
329	*
330	* @param mixed $html_or_id The HTML string to parse for images, or a post id.
331	* @param int $width Minimum Image width.
332	* @param int $height Minimum Image height.
333	*/
334	public static function from_blocks( $html_or_id, $width = 200, $height = 200 ) {
335	$images = array();
336
337	$html_info = self::get_post_html( $html_or_id );
338
339	if ( empty( $html_info['html'] ) ) {
340	return $images;
341	}
342
343	// Look for block information in the HTML.
344	$blocks = parse_blocks( $html_info['html'] );
345	if ( empty( $blocks ) ) {
346	return $images;
347	}
348
349	/*
350	* Let's loop through our blocks.
351	* Some blocks may include some other blocks. Let's go 2 levels deep to look for blocks
352	* that we support and that may include images (see get_images_from_block)
353	*
354	* @to-do: instead of looping manually (that's a lot of if and loops), search recursively instead.
355	*/
356	foreach ( $blocks as $block ) {
357	if ( ! self::is_nested_block( $block ) \|\| 'core/media-text' === $block['blockName'] ) {
358	$images = self::get_images_from_block( $images, $block, $html_info, $width, $height );
359	} else {
360	foreach ( $block['innerBlocks'] as $inner_block ) {
361	if ( ! self::is_nested_block( $inner_block ) ) {
362	$images = self::get_images_from_block( $images, $inner_block, $html_info, $width, $height );
363	} else {
364	foreach ( $inner_block['innerBlocks'] as $inner_inner_block ) {
365	$images = self::get_images_from_block( $images, $inner_inner_block, $html_info, $width, $height );
366	}
367	}
368	}
369	}
370	}
371
372	/**
373	* Returning a filtered array because get_attachment_data returns false
374	* for unsuccessful attempts.
375	*/
376	return array_filter( $images );
377	}
378
379	/**
380	* Very raw -- just parse the HTML and pull out any/all img tags and return their src
381	*
382	* @param mixed $html_or_id The HTML string to parse for images, or a post id.
383	* @param int $width Minimum Image width.
384	* @param int $height Minimum Image height.
385	*
386	* @uses DOMDocument
387	*
388	* @return Array containing images
389	*/
390	static function from_html( $html_or_id, $width = 200, $height = 200 ) {
391	$images = array();
392
393	$html_info = self::get_post_html( $html_or_id );
394
395	if ( empty( $html_info['html'] ) ) {
396	return $images;
397	}
398
399	// Do not go any further if DOMDocument is disabled on the server.
400	if ( ! class_exists( 'DOMDocument' ) ) {
401	return $images;
402	}
403
404	// Let's grab all image tags from the HTML.
405	$dom_doc = new DOMDocument();
406
407	// The @ is not enough to suppress errors when dealing with libxml,
408	// we have to tell it directly how we want to handle errors.
409	libxml_use_internal_errors( true );
410	@$dom_doc->loadHTML( $html_info['html'] );
411	libxml_use_internal_errors( false );
412
413	$image_tags = $dom_doc->getElementsByTagName( 'img' );
414
415	// For each image Tag, make sure it can be added to the $images array, and add it.
416	foreach ( $image_tags as $image_tag ) {
417	$img_src = $image_tag->getAttribute( 'src' );
418
419	if ( empty( $img_src ) ) {
420	continue;
421	}
422
423	// Do not grab smiley images that were automatically created by WP when entering text smilies.
424	if ( stripos( $img_src, '/smilies/' ) ) {
425	continue;
426	}
427
428	$meta = array(
429	'width' => (int) $image_tag->getAttribute( 'width' ),
430	'height' => (int) $image_tag->getAttribute( 'height' ),
431	'alt_text' => $image_tag->getAttribute( 'alt' ),
432	);
433
434	/**
435	* Filters the switch to ignore minimum image size requirements. Can be used
436	* to add custom logic to image dimensions, like only enforcing one of the dimensions,
437	* or disabling it entirely.
438	*
439	* @since 6.4.0
440	*
441	* @param bool $ignore Should the image dimensions be ignored?
442	* @param array $meta Array containing image dimensions parsed from the markup.
443	*/
444	$ignore_dimensions = apply_filters( 'jetpack_postimages_ignore_minimum_dimensions', false, $meta );
445
446	// Must be larger than 200x200 (or user-specified).
447	if (
448	! $ignore_dimensions
449	&& (
450	empty( $meta['width'] )
451	\|\| empty( $meta['height'] )
452	\|\| $meta['width'] < $width
453	\|\| $meta['height'] < $height
454	)
455	) {
456	continue;
457	}
458
459	$images[] = array(
460	'type' => 'image',
461	'from' => 'html',
462	'src' => $img_src,
463	'src_width' => $meta['width'],
464	'src_height' => $meta['height'],
465	'href' => $html_info['post_url'],
466	'alt_text' => $meta['alt_text'],
467	);
468	}
469	return $images;
470	}
471
472	/**
473	* @param int $post_id The post ID to check
474	* @param int $size
475	* @return Array containing details of the image, or empty array if none.
476	*/
477	static function from_blavatar( $post_id, $size = 96 ) {
478
479	$permalink = get_permalink( $post_id );
480
481	if ( function_exists( 'blavatar_domain' ) && function_exists( 'blavatar_exists' ) && function_exists( 'blavatar_url' ) ) {
482	$domain = blavatar_domain( $permalink );
483
484	if ( ! blavatar_exists( $domain ) ) {
485	return array();
486	}
487
488	$url = blavatar_url( $domain, 'img', $size );
489	} else {
490	$url = get_site_icon_url( $size );
491	if ( ! $url ) {
492	return array();
493	}
494	}
495
496	return array(
497	array(
498	'type' => 'image',
499	'from' => 'blavatar',
500	'src' => $url,
501	'src_width' => $size,
502	'src_height' => $size,
503	'href' => $permalink,
504	'alt_text' => '',
505	),
506	);
507	}
508
509	/**
510	* Gets a post image from the author avatar.
511	*
512	* @param int $post_id The post ID to check.
513	* @param int $size The size of the avatar to get.
514	* @param string $default The default image to use.
515	* @return Array containing details of the image, or empty array if none.
516	*/
517	static function from_gravatar( $post_id, $size = 96, $default = false ) {
518	$post = get_post( $post_id );
519	$permalink = get_permalink( $post_id );
520
521	if ( function_exists( 'wpcom_get_avatar_url' ) ) {
522	$url = wpcom_get_avatar_url( $post->post_author, $size, $default, true );
523	if ( $url && is_array( $url ) ) {
524	$url = $url[0];
525	}
526	} else {
527	$url = get_avatar_url(
528	$post->post_author,
529	array(
530	'size' => $size,
531	'default' => $default,
532	)
533	);
534	}
535
536	return array(
537	array(
538	'type' => 'image',
539	'from' => 'gravatar',
540	'src' => $url,
541	'src_width' => $size,
542	'src_height' => $size,
543	'href' => $permalink,
544	'alt_text' => '',
545	),
546	);
547	}
548
549	/**
550	* Run through the different methods that we have available to try to find a single good
551	* display image for this post.
552	*
553	* @param int $post_id
554	* @param array $args Other arguments (currently width and height required for images where possible to determine)
555	* @return Array containing details of the best image to be used
556	*/
557	static function get_image( $post_id, $args = array() ) {
558	$image = '';
559
560	/**
561	* Fires before we find a single good image for a specific post.
562	*
563	* @since 2.2.0
564	*
565	* @param int $post_id Post ID.
566	*/
567	do_action( 'jetpack_postimages_pre_get_image', $post_id );
568	$media = self::get_images( $post_id, $args );
569
570	if ( is_array( $media ) ) {
571	foreach ( $media as $item ) {
572	if ( 'image' == $item['type'] ) {
573	$image = $item;
574	break;
575	}
576	}
577	}
578
579	/**
580	* Fires after we find a single good image for a specific post.
581	*
582	* @since 2.2.0
583	*
584	* @param int $post_id Post ID.
585	*/
586	do_action( 'jetpack_postimages_post_get_image', $post_id );
587
588	return $image;
589	}
590
591	/**
592	* Get an array containing a collection of possible images for this post, stopping once we hit a method
593	* that returns something useful.
594	*
595	* @param int $post_id
596	* @param array $args Optional args, see defaults list for details
597	* @return Array containing images that would be good for representing this post
598	*/
599	static function get_images( $post_id, $args = array() ) {
600	// Figure out which image to attach to this post.
601	$media = false;
602
603	/**
604	* Filters the array of images that would be good for a specific post.
605	* This filter is applied before options ($args) filter the original array.
606	*
607	* @since 2.0.0
608	*
609	* @param array $media Array of images that would be good for a specific post.
610	* @param int $post_id Post ID.
611	* @param array $args Array of options to get images.
612	*/
613	$media = apply_filters( 'jetpack_images_pre_get_images', $media, $post_id, $args );
614	if ( $media ) {
615	return $media;
616	}
617
618	$defaults = array(
619	'width' => 200, // Required minimum width (if possible to determine)
620	'height' => 200, // Required minimum height (if possible to determine)
621
622	'fallback_to_avatars' => false, // Optionally include Blavatar and Gravatar (in that order) in the image stack
623	'avatar_size' => 96, // Used for both Grav and Blav
624	'gravatar_default' => false, // Default image to use if we end up with no Gravatar
625
626	'from_thumbnail' => true, // Use these flags to specify which methods to use to find an image
627	'from_slideshow' => true,
628	'from_gallery' => true,
629	'from_attachment' => true,
630	'from_blocks' => true,
631	'from_html' => true,
632
633	'html_content' => '', // HTML string to pass to from_html()
634	);
635	$args = wp_parse_args( $args, $defaults );
636
637	$media = false;
638	if ( $args['from_thumbnail'] ) {
639	$media = self::from_thumbnail( $post_id, $args['width'], $args['height'] );
640	}
641	if ( ! $media && $args['from_slideshow'] ) {
642	$media = self::from_slideshow( $post_id, $args['width'], $args['height'] );
643	}
644	if ( ! $media && $args['from_gallery'] ) {
645	$media = self::from_gallery( $post_id );
646	}
647	if ( ! $media && $args['from_attachment'] ) {
648	$media = self::from_attachment( $post_id, $args['width'], $args['height'] );
649	}
650	if ( ! $media && $args['from_blocks'] ) {
651	if ( empty( $args['html_content'] ) ) {
652	$media = self::from_blocks( $post_id, $args['width'], $args['height'] ); // Use the post_id, which will load the content
653	} else {
654	$media = self::from_blocks( $args['html_content'], $args['width'], $args['height'] ); // If html_content is provided, use that
655	}
656	}
657	if ( ! $media && $args['from_html'] ) {
658	if ( empty( $args['html_content'] ) ) {
659	$media = self::from_html( $post_id, $args['width'], $args['height'] ); // Use the post_id, which will load the content
660	} else {
661	$media = self::from_html( $args['html_content'], $args['width'], $args['height'] ); // If html_content is provided, use that
662	}
663	}
664
665	if ( ! $media && $args['fallback_to_avatars'] ) {
666	$media = self::from_blavatar( $post_id, $args['avatar_size'] );
667	if ( ! $media ) {
668	$media = self::from_gravatar( $post_id, $args['avatar_size'], $args['gravatar_default'] );
669	}
670	}
671
672	/**
673	* Filters the array of images that would be good for a specific post.
674	* This filter is applied after options ($args) filter the original array.
675	*
676	* @since 2.0.0
677	*
678	* @param array $media Array of images that would be good for a specific post.
679	* @param int $post_id Post ID.
680	* @param array $args Array of options to get images.
681	*/
682	return apply_filters( 'jetpack_images_get_images', $media, $post_id, $args );
683	}
684
685	/**
686	* Takes an image URL and pixel dimensions then returns a URL for the
687	* resized and cropped image.
688	*
689	* @param string $src
690	* @param int $dimension
691	* @return string Transformed image URL
692	*/
693	static function fit_image_url( $src, $width, $height ) {
694	$width = (int) $width;
695	$height = (int) $height;
696
697	if ( $width < 1 \|\| $height < 1 ) {
698	return $src;
699	}
700
701	// See if we should bypass WordPress.com SaaS resizing
702	if ( has_filter( 'jetpack_images_fit_image_url_override' ) ) {
703	/**
704	* Filters the image URL used after dimensions are set by Photon.
705	*
706	* @since 3.3.0
707	*
708	* @param string $src Image URL.
709	* @param int $width Image width.
710	* @param int $width Image height.
711	*/
712	return apply_filters( 'jetpack_images_fit_image_url_override', $src, $width, $height );
713	}
714
715	// If WPCOM hosted image use native transformations
716	$img_host = wp_parse_url( $src, PHP_URL_HOST );
717	if ( '.files.wordpress.com' == substr( $img_host, -20 ) ) {
718	return add_query_arg(
719	array(
720	'w' => $width,
721	'h' => $height,
722	'crop' => 1,
723	),
724	set_url_scheme( $src )
725	);
726	}
727
728	// Use Photon magic
729	if ( function_exists( 'jetpack_photon_url' ) ) {
730	return jetpack_photon_url( $src, array( 'resize' => "$width,$height" ) );
731	}
732
733	// Arg... no way to resize image using WordPress.com infrastructure!
734	return $src;
735	}
736
737	/**
738	* Get HTML from given post content.
739	*
740	* @since 6.9.0
741	*
742	* @param mixed $html_or_id The HTML string to parse for images, or a post id.
743	*
744	* @return array $html_info {
745	* @type string $html Post content.
746	* @type string $post_url Post URL.
747	* }
748	*/
749	static function get_post_html( $html_or_id ) {
750	if ( is_numeric( $html_or_id ) ) {
751	$post = get_post( $html_or_id );
752
753	if ( empty( $post ) \|\| ! empty( $post->post_password ) ) {
754	return '';
755	}
756
757	$html_info = array(
758	'html' => $post->post_content, // DO NOT apply the_content filters here, it will cause loops.
759	'post_url' => get_permalink( $post->ID ),
760	);
761	} else {
762	$html_info = array(
763	'html' => $html_or_id,
764	'post_url' => '',
765	);
766	}
767	return $html_info;
768	}
769
770	/**
771	* Get info about a WordPress attachment.
772	*
773	* @since 6.9.0
774	*
775	* @param int $attachment_id Attachment ID.
776	* @param string $post_url URL of the post, if we have one.
777	* @param int $width Minimum Image width.
778	* @param int $height Minimum Image height.
779	* @return array\|bool Image data or false if unavailable.
780	*/
781	public static function get_attachment_data( $attachment_id, $post_url = '', $width, $height ) {
782	if ( empty( $attachment_id ) ) {
783	return false;
784	}
785
786	$meta = wp_get_attachment_metadata( $attachment_id );
787
788	// The image must be larger than 200x200.
789	if ( ! isset( $meta['width'] ) \|\| $meta['width'] < $width ) {
790	return false;
791	}
792	if ( ! isset( $meta['height'] ) \|\| $meta['height'] < $height ) {
793	return false;
794	}
795
796	$url = wp_get_attachment_url( $attachment_id );
797
798	return array(
799	'type' => 'image',
800	'from' => 'attachment',
801	'src' => $url,
802	'src_width' => $meta['width'],
803	'src_height' => $meta['height'],
804	'href' => $post_url,
805	'alt_text' => self::get_alt_text( $attachment_id ),
806	);
807	}
808
809	/**
810	* Get the alt text for an image or other media from the Media Library.
811	*
812	* @since 7.1
813	*
814	* @param int $attachment_id The Post ID of the media.
815	* @return string The alt text value or an emptry string.
816	*/
817	public static function get_alt_text( $attachment_id ) {
818	return get_post_meta( $attachment_id, '_wp_attachment_image_alt', true );
819	}
820
821	/**
822	* Get an image from a block.
823	*
824	* @since 7.8.0
825	*
826	* @param array $images Images found.
827	* @param array $block Block and its attributes.
828	* @param array $html_info Info about the post where the block is found.
829	* @param int $width Desired image width.
830	* @param int $height Desired image height.
831	*
832	* @return array Array of images found.
833	*/
834	private static function get_images_from_block( $images, $block, $html_info, $width, $height ) {
835	/**
836	* Parse content from Core Image blocks.
837	* If it is an image block for an image hosted on our site, it will have an ID.
838	* If it does not have an ID, let `from_html` parse that content later,
839	* and extract an image if it has size parameters.
840	*/
841	if (
842	'core/image' === $block['blockName']
843	&& ! empty( $block['attrs']['id'] )
844	) {
845	$images[] = self::get_attachment_data( $block['attrs']['id'], $html_info['post_url'], $width, $height );
846	} elseif (
847	'core/media-text' === $block['blockName']
848	&& ! empty( $block['attrs']['mediaId'] )
849	) {
850	$images[] = self::get_attachment_data( $block['attrs']['mediaId'], $html_info['post_url'], $width, $height );
851	} elseif (
852	/**
853	* Parse content from Core Gallery blocks as well from Jetpack's Tiled Gallery and Slideshow blocks.
854	* Gallery blocks include the ID of each one of the images in the gallery.
855	*/
856	in_array( $block['blockName'], array( 'core/gallery', 'jetpack/tiled-gallery', 'jetpack/slideshow' ), true )
857	&& ! empty( $block['attrs']['ids'] )
858	) {
859	foreach ( $block['attrs']['ids'] as $img_id ) {
860	$images[] = self::get_attachment_data( $img_id, $html_info['post_url'], $width, $height );
861	}
862	}
863
864	return $images;
865	}
866
867	/**
868	* Check if a block has inner blocks.
869	*
870	* @since 7.8.0
871	*
872	* @param array $block Block and its attributes.
873	*
874	* @return bool
875	*/
876	private static function is_nested_block( $block ) {
877	if ( ! empty( $block['innerBlocks'] ) ) {
878	return true;
879	}
880
881	return false;
882	}
883	}
884