class.photon.php — Jetpack – WP Security, Backup, Speed, & Growth 4.6.3

jetpack / class.photon.php

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class.photon.php

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1	<?php
2
3	class Jetpack_Photon {
4	/**
5	* Class variables
6	*/
7	// Oh look, a singleton
8	private static $__instance = null;
9
10	// Allowed extensions must match http://code.trac.wordpress.org/browser/photon/index.php#L31
11	protected static $extensions = array(
12	'gif',
13	'jpg',
14	'jpeg',
15	'png'
16	);
17
18	// Don't access this directly. Instead, use self::image_sizes() so it's actually populated with something.
19	protected static $image_sizes = null;
20
21	/**
22	* Singleton implementation
23	*
24	* @return object
25	*/
26	public static function instance() {
27	if ( ! is_a( self::$__instance, 'Jetpack_Photon' ) ) {
28	self::$__instance = new Jetpack_Photon;
29	self::$__instance->setup();
30	}
31
32	return self::$__instance;
33	}
34
35	/**
36	* Silence is golden.
37	*/
38	private function __construct() {}
39
40	/**
41	* Register actions and filters, but only if basic Photon functions are available.
42	* The basic functions are found in ./functions.photon.php.
43	*
44	* @uses add_action, add_filter
45	* @return null
46	*/
47	private function setup() {
48	if ( ! function_exists( 'jetpack_photon_url' ) )
49	return;
50
51	// Images in post content and galleries
52	add_filter( 'the_content', array( __CLASS__, 'filter_the_content' ), 999999 );
53	add_filter( 'get_post_galleries', array( __CLASS__, 'filter_the_galleries' ), 999999 );
54
55	// Core image retrieval
56	add_filter( 'image_downsize', array( $this, 'filter_image_downsize' ), 10, 3 );
57
58	// Responsive image srcset substitution
59	add_filter( 'wp_calculate_image_srcset', array( $this, 'filter_srcset_array' ), 10, 4 );
60	add_filter( 'wp_calculate_image_sizes', array( $this, 'filter_sizes' ), 1, 2 ); // Early so themes can still easily filter.
61
62	// Helpers for maniuplated images
63	add_action( 'wp_enqueue_scripts', array( $this, 'action_wp_enqueue_scripts' ), 9 );
64	}
65
66	/**
67	** IN-CONTENT IMAGE MANIPULATION FUNCTIONS
68	**/
69
70	/**
71	* Match all images and any relevant <a> tags in a block of HTML.
72	*
73	* @param string $content Some HTML.
74	* @return array An array of $images matches, where $images[0] is
75	* an array of full matches, and the link_url, img_tag,
76	* and img_url keys are arrays of those matches.
77	*/
78	public static function parse_images_from_html( $content ) {
79	$images = array();
80
81	if ( preg_match_all( '#(?:<a[^>]+?href=["\|\'](?P<link_url>[^\s]+?)["\|\'][^>]?>\s)?(?P<img_tag><img[^>]?\s+?src=["\|\'](?P<img_url>[^\s]+?)["\|\'].?>){1}(?:\s*</a>)?#is', $content, $images ) ) {
82	foreach ( $images as $key => $unused ) {
83	// Simplify the output as much as possible, mostly for confirming test results.
84	if ( is_numeric( $key ) && $key > 0 )
85	unset( $images[$key] );
86	}
87
88	return $images;
89	}
90
91	return array();
92	}
93
94	/**
95	* Try to determine height and width from strings WP appends to resized image filenames.
96	*
97	* @param string $src The image URL.
98	* @return array An array consisting of width and height.
99	*/
100	public static function parse_dimensions_from_filename( $src ) {
101	$width_height_string = array();
102
103	if ( preg_match( '#-(\d+)x(\d+)\.(?:' . implode('\|', self::$extensions ) . '){1}$#i', $src, $width_height_string ) ) {
104	$width = (int) $width_height_string[1];
105	$height = (int) $width_height_string[2];
106
107	if ( $width && $height )
108	return array( $width, $height );
109	}
110
111	return array( false, false );
112	}
113
114	/**
115	* Identify images in post content, and if images are local (uploaded to the current site), pass through Photon.
116	*
117	* @param string $content
118	* @uses self::validate_image_url, apply_filters, jetpack_photon_url, esc_url
119	* @filter the_content
120	* @return string
121	*/
122	public static function filter_the_content( $content ) {
123	$images = Jetpack_Photon::parse_images_from_html( $content );
124
125	if ( ! empty( $images ) ) {
126	$content_width = Jetpack::get_content_width();
127
128	$image_sizes = self::image_sizes();
129	$upload_dir = wp_get_upload_dir();
130
131	foreach ( $images[0] as $index => $tag ) {
132	// Default to resize, though fit may be used in certain cases where a dimension cannot be ascertained
133	$transform = 'resize';
134
135	// Start with a clean attachment ID each time
136	$attachment_id = false;
137
138	// Flag if we need to munge a fullsize URL
139	$fullsize_url = false;
140
141	// Identify image source
142	$src = $src_orig = $images['img_url'][ $index ];
143
144	/**
145	* Allow specific images to be skipped by Photon.
146	*
147	* @module photon
148	*
149	* @since 2.0.3
150	*
151	* @param bool false Should Photon ignore this image. Default to false.
152	* @param string $src Image URL.
153	* @param string $tag Image Tag (Image HTML output).
154	*/
155	if ( apply_filters( 'jetpack_photon_skip_image', false, $src, $tag ) )
156	continue;
157
158	// Support Automattic's Lazy Load plugin
159	// Can't modify $tag yet as we need unadulterated version later
160	if ( preg_match( '#data-lazy-src=["\|\'](.+?)["\|\']#i', $images['img_tag'][ $index ], $lazy_load_src ) ) {
161	$placeholder_src = $placeholder_src_orig = $src;
162	$src = $src_orig = $lazy_load_src[1];
163	} elseif ( preg_match( '#data-lazy-original=["\|\'](.+?)["\|\']#i', $images['img_tag'][ $index ], $lazy_load_src ) ) {
164	$placeholder_src = $placeholder_src_orig = $src;
165	$src = $src_orig = $lazy_load_src[1];
166	}
167
168	// Check if image URL should be used with Photon
169	if ( self::validate_image_url( $src ) ) {
170	// Find the width and height attributes
171	$width = $height = false;
172
173	// First, check the image tag
174	if ( preg_match( '#width=["\|\']?([\d%]+)["\|\']?#i', $images['img_tag'][ $index ], $width_string ) )
175	$width = $width_string[1];
176
177	if ( preg_match( '#height=["\|\']?([\d%]+)["\|\']?#i', $images['img_tag'][ $index ], $height_string ) )
178	$height = $height_string[1];
179
180	// Can't pass both a relative width and height, so unset the height in favor of not breaking the horizontal layout.
181	if ( false !== strpos( $width, '%' ) && false !== strpos( $height, '%' ) )
182	$width = $height = false;
183
184	// Detect WP registered image size from HTML class
185	if ( preg_match( '#class=["\|\']?[^"\']size-([^"\'\s]+)[^"\']["\|\']?#i', $images['img_tag'][ $index ], $size ) ) {
186	$size = array_pop( $size );
187
188	if ( false === $width && false === $height && 'full' != $size && array_key_exists( $size, $image_sizes ) ) {
189	$width = (int) $image_sizes[ $size ]['width'];
190	$height = (int) $image_sizes[ $size ]['height'];
191	$transform = $image_sizes[ $size ]['crop'] ? 'resize' : 'fit';
192	}
193	} else {
194	unset( $size );
195	}
196
197	// WP Attachment ID, if uploaded to this site
198	if (
199	preg_match( '#class=["\|\']?[^"\']wp-image-([\d]+)[^"\']["\|\']?#i', $images['img_tag'][ $index ], $attachment_id ) &&
200	(
201	0 === strpos( $src, $upload_dir['baseurl'] ) \|\|
202	/**
203	* Filter whether an image using an attachment ID in its class has to be uploaded to the local site to go through Photon.
204	*
205	* @module photon
206	*
207	* @since 2.0.3
208	*
209	* @param bool false Was the image uploaded to the local site. Default to false.
210	* @param array $args {
211	* Array of image details.
212	*
213	* @type $src Image URL.
214	* @type tag Image tag (Image HTML output).
215	* @type $images Array of information about the image.
216	* @type $index Image index.
217	* }
218	*/
219	apply_filters( 'jetpack_photon_image_is_local', false, compact( 'src', 'tag', 'images', 'index' ) )
220	)
221	) {
222	$attachment_id = intval( array_pop( $attachment_id ) );
223
224	if ( $attachment_id ) {
225	$attachment = get_post( $attachment_id );
226
227	// Basic check on returned post object
228	if ( is_object( $attachment ) && ! is_wp_error( $attachment ) && 'attachment' == $attachment->post_type ) {
229	$src_per_wp = wp_get_attachment_image_src( $attachment_id, isset( $size ) ? $size : 'full' );
230
231	if ( self::validate_image_url( $src_per_wp[0] ) ) {
232	$src = $src_per_wp[0];
233	$fullsize_url = true;
234
235	// Prevent image distortion if a detected dimension exceeds the image's natural dimensions
236	if ( ( false !== $width && $width > $src_per_wp[1] ) \|\| ( false !== $height && $height > $src_per_wp[2] ) ) {
237	$width = false === $width ? false : min( $width, $src_per_wp[1] );
238	$height = false === $height ? false : min( $height, $src_per_wp[2] );
239	}
240
241	// If no width and height are found, max out at source image's natural dimensions
242	// Otherwise, respect registered image sizes' cropping setting
243	if ( false === $width && false === $height ) {
244	$width = $src_per_wp[1];
245	$height = $src_per_wp[2];
246	$transform = 'fit';
247	} elseif ( isset( $size ) && array_key_exists( $size, $image_sizes ) && isset( $image_sizes[ $size ]['crop'] ) ) {
248	$transform = (bool) $image_sizes[ $size ]['crop'] ? 'resize' : 'fit';
249	}
250	}
251	} else {
252	unset( $attachment_id );
253	unset( $attachment );
254	}
255	}
256	}
257
258	// If image tag lacks width and height arguments, try to determine from strings WP appends to resized image filenames.
259	if ( false === $width && false === $height ) {
260	list( $width, $height ) = Jetpack_Photon::parse_dimensions_from_filename( $src );
261	}
262
263	// If width is available, constrain to $content_width
264	if ( false !== $width && false === strpos( $width, '%' ) && is_numeric( $content_width ) ) {
265	if ( $width > $content_width && false !== $height && false === strpos( $height, '%' ) ) {
266	$height = round( ( $content_width * $height ) / $width );
267	$width = $content_width;
268	} elseif ( $width > $content_width ) {
269	$width = $content_width;
270	}
271	}
272
273	// Set a width if none is found and $content_width is available
274	// If width is set in this manner and height is available, use `fit` instead of `resize` to prevent skewing
275	if ( false === $width && is_numeric( $content_width ) ) {
276	$width = (int) $content_width;
277
278	if ( false !== $height )
279	$transform = 'fit';
280	}
281
282	// Detect if image source is for a custom-cropped thumbnail and prevent further URL manipulation.
283	if ( ! $fullsize_url && preg_match_all( '#-e[a-z0-9]+(-\d+x\d+)?\.(' . implode('\|', self::$extensions ) . '){1}$#i', basename( $src ), $filename ) )
284	$fullsize_url = true;
285
286	// Build URL, first maybe removing WP's resized string so we pass the original image to Photon
287	if ( ! $fullsize_url ) {
288	$src = self::strip_image_dimensions_maybe( $src );
289	}
290
291	// Build array of Photon args and expose to filter before passing to Photon URL function
292	$args = array();
293
294	if ( false !== $width && false !== $height && false === strpos( $width, '%' ) && false === strpos( $height, '%' ) )
295	$args[ $transform ] = $width . ',' . $height;
296	elseif ( false !== $width )
297	$args['w'] = $width;
298	elseif ( false !== $height )
299	$args['h'] = $height;
300
301	/**
302	* Filter the array of Photon arguments added to an image when it goes through Photon.
303	* By default, only includes width and height values.
304	* @see https://developer.wordpress.com/docs/photon/api/
305	*
306	* @module photon
307	*
308	* @since 2.0.0
309	*
310	* @param array $args Array of Photon Arguments.
311	* @param array $args {
312	* Array of image details.
313	*
314	* @type $tag Image tag (Image HTML output).
315	* @type $src Image URL.
316	* @type $src_orig Original Image URL.
317	* @type $width Image width.
318	* @type $height Image height.
319	* }
320	*/
321	$args = apply_filters( 'jetpack_photon_post_image_args', $args, compact( 'tag', 'src', 'src_orig', 'width', 'height' ) );
322
323	$photon_url = jetpack_photon_url( $src, $args );
324
325	// Modify image tag if Photon function provides a URL
326	// 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.
327	if ( $src != $photon_url ) {
328	$new_tag = $tag;
329
330	// If present, replace the link href with a Photoned URL for the full-size image.
331	if ( ! empty( $images['link_url'][ $index ] ) && self::validate_image_url( $images['link_url'][ $index ] ) )
332	$new_tag = preg_replace( '#(href=["\|\'])' . $images['link_url'][ $index ] . '(["\|\'])#i', '\1' . jetpack_photon_url( $images['link_url'][ $index ] ) . '\2', $new_tag, 1 );
333
334	// Supplant the original source value with our Photon URL
335	$photon_url = esc_url( $photon_url );
336	$new_tag = str_replace( $src_orig, $photon_url, $new_tag );
337
338	// If Lazy Load is in use, pass placeholder image through Photon
339	if ( isset( $placeholder_src ) && self::validate_image_url( $placeholder_src ) ) {
340	$placeholder_src = jetpack_photon_url( $placeholder_src );
341
342	if ( $placeholder_src != $placeholder_src_orig )
343	$new_tag = str_replace( $placeholder_src_orig, esc_url( $placeholder_src ), $new_tag );
344
345	unset( $placeholder_src );
346	}
347
348	// Remove the width and height arguments from the tag to prevent distortion
349	$new_tag = preg_replace( '#(?<=\s)(width\|height)=["\|\']?[\d%]+["\|\']?\s?#i', '', $new_tag );
350
351	// Tag an image for dimension checking
352	$new_tag = preg_replace( '#(\s?/)?>(\s*</a>)?$#i', ' data-recalc-dims="1"\1>\2', $new_tag );
353
354	// Replace original tag with modified version
355	$content = str_replace( $tag, $new_tag, $content );
356	}
357	} elseif ( preg_match( '#^http(s)?://i[\d]{1}.wp.com#', $src ) && ! empty( $images['link_url'][ $index ] ) && self::validate_image_url( $images['link_url'][ $index ] ) ) {
358	$new_tag = preg_replace( '#(href=["\|\'])' . $images['link_url'][ $index ] . '(["\|\'])#i', '\1' . jetpack_photon_url( $images['link_url'][ $index ] ) . '\2', $tag, 1 );
359
360	$content = str_replace( $tag, $new_tag, $content );
361	}
362	}
363	}
364
365	return $content;
366	}
367
368	public static function filter_the_galleries( $galleries ) {
369	if ( empty( $galleries ) \|\| ! is_array( $galleries ) ) {
370	return $galleries;
371	}
372
373	// Pass by reference, so we can modify them in place.
374	foreach ( $galleries as &$this_gallery ) {
375	if ( is_string( $this_gallery ) ) {
376	$this_gallery = self::filter_the_content( $this_gallery );
377	// LEAVING COMMENTED OUT as for the moment it doesn't seem
378	// necessary and I'm not sure how it would propagate through.
379	// } elseif ( is_array( $this_gallery )
380	// && ! empty( $this_gallery['src'] )
381	// && ! empty( $this_gallery['type'] )
382	// && in_array( $this_gallery['type'], array( 'rectangle', 'square', 'circle' ) ) ) {
383	// $this_gallery['src'] = array_map( 'jetpack_photon_url', $this_gallery['src'] );
384	}
385	}
386	unset( $this_gallery ); // break the reference.
387
388	return $galleries;
389	}
390
391	/**
392	** CORE IMAGE RETRIEVAL
393	**/
394
395	/**
396	* Filter post thumbnail image retrieval, passing images through Photon
397	*
398	* @param string\|bool $image
399	* @param int $attachment_id
400	* @param string\|array $size
401	* @uses is_admin, apply_filters, wp_get_attachment_url, self::validate_image_url, this::image_sizes, jetpack_photon_url
402	* @filter image_downsize
403	* @return string\|bool
404	*/
405	public function filter_image_downsize( $image, $attachment_id, $size ) {
406	// Don't foul up the admin side of things, and provide plugins a way of preventing Photon from being applied to images.
407	if (
408	is_admin() \|\|
409	/**
410	* Provide plugins a way of preventing Photon from being applied to images retrieved from WordPress Core.
411	*
412	* @module photon
413	*
414	* @since 2.0.0
415	*
416	* @param bool false Stop Photon from being applied to the image. Default to false.
417	* @param array $args {
418	* Array of image details.
419	*
420	* @type $image Image URL.
421	* @type $attachment_id Attachment ID of the image.
422	* @type $size Image size. Can be a string (name of the image size, e.g. full) or an integer.
423	* }
424	*/
425	apply_filters( 'jetpack_photon_override_image_downsize', false, compact( 'image', 'attachment_id', 'size' ) )
426	)
427	return $image;
428
429	// Get the image URL and proceed with Photon-ification if successful
430	$image_url = wp_get_attachment_url( $attachment_id );
431
432	// Set this to true later when we know we have size meta.
433	$has_size_meta = false;
434
435	if ( $image_url ) {
436	// Check if image URL should be used with Photon
437	if ( ! self::validate_image_url( $image_url ) )
438	return $image;
439
440	$intermediate = true; // For the fourth array item returned by the image_downsize filter.
441
442	// If an image is requested with a size known to WordPress, use that size's settings with Photon
443	if ( ( is_string( $size ) \|\| is_int( $size ) ) && array_key_exists( $size, self::image_sizes() ) ) {
444	$image_args = self::image_sizes();
445	$image_args = $image_args[ $size ];
446
447	$photon_args = array();
448
449	$image_meta = image_get_intermediate_size( $attachment_id, $size );
450
451	// 'full' is a special case: We need consistent data regardless of the requested size.
452	if ( 'full' == $size ) {
453	$image_meta = wp_get_attachment_metadata( $attachment_id );
454	$intermediate = false;
455	} elseif ( ! $image_meta ) {
456	// If we still don't have any image meta at this point, it's probably from a custom thumbnail size
457	// for an image that was uploaded before the custom image was added to the theme. Try to determine the size manually.
458	$image_meta = wp_get_attachment_metadata( $attachment_id );
459
460	if ( isset( $image_meta['width'], $image_meta['height'] ) ) {
461	$image_resized = image_resize_dimensions( $image_meta['width'], $image_meta['height'], $image_args['width'], $image_args['height'], $image_args['crop'] );
462	if ( $image_resized ) { // This could be false when the requested image size is larger than the full-size image.
463	$image_meta['width'] = $image_resized[6];
464	$image_meta['height'] = $image_resized[7];
465	}
466	}
467	}
468
469	if ( isset( $image_meta['width'], $image_meta['height'] ) ) {
470	$image_args['width'] = $image_meta['width'];
471	$image_args['height'] = $image_meta['height'];
472
473	list( $image_args['width'], $image_args['height'] ) = image_constrain_size_for_editor( $image_args['width'], $image_args['height'], $size, 'display' );
474	$has_size_meta = true;
475	}
476
477	// Expose determined arguments to a filter before passing to Photon
478	$transform = $image_args['crop'] ? 'resize' : 'fit';
479
480	// Check specified image dimensions and account for possible zero values; photon fails to resize if a dimension is zero.
481	if ( 0 == $image_args['width'] \|\| 0 == $image_args['height'] ) {
482	if ( 0 == $image_args['width'] && 0 < $image_args['height'] ) {
483	$photon_args['h'] = $image_args['height'];
484	} elseif ( 0 == $image_args['height'] && 0 < $image_args['width'] ) {
485	$photon_args['w'] = $image_args['width'];
486	}
487	} else {
488	if ( ( 'resize' === $transform ) && $image_meta = wp_get_attachment_metadata( $attachment_id ) ) {
489	if ( isset( $image_meta['width'], $image_meta['height'] ) ) {
490	// Lets make sure that we don't upscale images since wp never upscales them as well
491	$smaller_width = ( ( $image_meta['width'] < $image_args['width'] ) ? $image_meta['width'] : $image_args['width'] );
492	$smaller_height = ( ( $image_meta['height'] < $image_args['height'] ) ? $image_meta['height'] : $image_args['height'] );
493
494	$photon_args[ $transform ] = $smaller_width . ',' . $smaller_height;
495	}
496	} else {
497	$photon_args[ $transform ] = $image_args['width'] . ',' . $image_args['height'];
498	}
499
500	}
501
502
503	/**
504	* Filter the Photon Arguments added to an image when going through Photon, when that image size is a string.
505	* Image size will be a string (e.g. "full", "medium") when it is known to WordPress.
506	*
507	* @module photon
508	*
509	* @since 2.0.0
510	*
511	* @param array $photon_args Array of Photon arguments.
512	* @param array $args {
513	* Array of image details.
514	*
515	* @type $image_args Array of Image arguments (width, height, crop).
516	* @type $image_url Image URL.
517	* @type $attachment_id Attachment ID of the image.
518	* @type $size Image size. Can be a string (name of the image size, e.g. full) or an integer.
519	* @type $transform Value can be resize or fit.
520	* @see https://developer.wordpress.com/docs/photon/api
521	* }
522	*/
523	$photon_args = apply_filters( 'jetpack_photon_image_downsize_string', $photon_args, compact( 'image_args', 'image_url', 'attachment_id', 'size', 'transform' ) );
524
525	// Generate Photon URL
526	$image = array(
527	jetpack_photon_url( $image_url, $photon_args ),
528	$has_size_meta ? $image_args['width'] : false,
529	$has_size_meta ? $image_args['height'] : false,
530	$intermediate
531	);
532	} elseif ( is_array( $size ) ) {
533	// Pull width and height values from the provided array, if possible
534	$width = isset( $size[0] ) ? (int) $size[0] : false;
535	$height = isset( $size[1] ) ? (int) $size[1] : false;
536
537	// Don't bother if necessary parameters aren't passed.
538	if ( ! $width \|\| ! $height ) {
539	return $image;
540	}
541
542	$image_meta = wp_get_attachment_metadata( $attachment_id );
543	if ( isset( $image_meta['width'], $image_meta['height'] ) ) {
544	$image_resized = image_resize_dimensions( $image_meta['width'], $image_meta['height'], $width, $height );
545
546	if ( $image_resized ) { // This could be false when the requested image size is larger than the full-size image.
547	$width = $image_resized[6];
548	$height = $image_resized[7];
549	} else {
550	$width = $image_meta['width'];
551	$height = $image_meta['height'];
552	}
553
554	$has_size_meta = true;
555	}
556
557	list( $width, $height ) = image_constrain_size_for_editor( $width, $height, $size );
558
559	// Expose arguments to a filter before passing to Photon
560	$photon_args = array(
561	'fit' => $width . ',' . $height
562	);
563
564	/**
565	* Filter the Photon Arguments added to an image when going through Photon,
566	* when the image size is an array of height and width values.
567	*
568	* @module photon
569	*
570	* @since 2.0.0
571	*
572	* @param array $photon_args Array of Photon arguments.
573	* @param array $args {
574	* Array of image details.
575	*
576	* @type $width Image width.
577	* @type height Image height.
578	* @type $image_url Image URL.
579	* @type $attachment_id Attachment ID of the image.
580	* }
581	*/
582	$photon_args = apply_filters( 'jetpack_photon_image_downsize_array', $photon_args, compact( 'width', 'height', 'image_url', 'attachment_id' ) );
583
584	// Generate Photon URL
585	$image = array(
586	jetpack_photon_url( $image_url, $photon_args ),
587	$has_size_meta ? $width : false,
588	$has_size_meta ? $height : false,
589	$intermediate
590	);
591	}
592	}
593
594	return $image;
595	}
596
597	/**
598	* Filters an array of image `srcset` values, replacing each URL with its Photon equivalent.
599	*
600	* @since 3.8.0
601	* @since 4.0.4 Added automatically additional sizes beyond declared image sizes.
602	* @param array $sources An array of image urls and widths.
603	* @uses self::validate_image_url, jetpack_photon_url, Jetpack_Photon::parse_from_filename
604	* @uses Jetpack_Photon::strip_image_dimensions_maybe, Jetpack::get_content_width
605	* @return array An array of Photon image urls and widths.
606	*/
607	public function filter_srcset_array( $sources, $size_array, $image_src, $image_meta ) {
608	$upload_dir = wp_get_upload_dir();
609
610	foreach ( $sources as $i => $source ) {
611	if ( ! self::validate_image_url( $source['url'] ) ) {
612	continue;
613	}
614
615	/** This filter is already documented in class.photon.php */
616	if ( apply_filters( 'jetpack_photon_skip_image', false, $source['url'], $source ) ) {
617	continue;
618	}
619
620	$url = $source['url'];
621	list( $width, $height ) = Jetpack_Photon::parse_dimensions_from_filename( $url );
622
623	// It's quicker to get the full size with the data we have already, if available
624	if ( isset( $image_meta['file'] ) ) {
625	$url = trailingslashit( $upload_dir['baseurl'] ) . $image_meta['file'];
626	} else {
627	$url = Jetpack_Photon::strip_image_dimensions_maybe( $url );
628	}
629
630	$args = array();
631	if ( 'w' === $source['descriptor'] ) {
632	if ( $height && ( $source['value'] == $width ) ) {
633	$args['resize'] = $width . ',' . $height;
634	} else {
635	$args['w'] = $source['value'];
636	}
637
638	}
639
640	$sources[ $i ]['url'] = jetpack_photon_url( $url, $args );
641	}
642
643	/**
644	* At this point, $sources is the original srcset with Photonized URLs.
645	* Now, we're going to construct additional sizes based on multiples of the content_width.
646	* This will reduce the gap between the largest defined size and the original image.
647	*/
648
649	/**
650	* Filter the multiplier Photon uses to create new srcset items.
651	* Return false to short-circuit and bypass auto-generation.
652	*
653	* @module photon
654	*
655	* @since 4.0.4
656	*
657	* @param array\|bool $multipliers Array of multipliers to use or false to bypass.
658	*/
659	$multipliers = apply_filters( 'jetpack_photon_srcset_multipliers', array( 2, 3 ) );
660	$url = trailingslashit( $upload_dir['baseurl'] ) . $image_meta['file'];
661
662	if (
663	/** Short-circuit via jetpack_photon_srcset_multipliers filter. */
664	is_array( $multipliers )
665	/** This filter is already documented in class.photon.php */
666	&& ! apply_filters( 'jetpack_photon_skip_image', false, $url, null )
667	/** Verify basic meta is intact. */
668	&& isset( $image_meta['width'] ) && isset( $image_meta['height'] ) && isset( $image_meta['file'] )
669	/** Verify we have the requested width/height. */
670	&& isset( $size_array[0] ) && isset( $size_array[1] )
671	) {
672
673	$fullwidth = $image_meta['width'];
674	$fullheight = $image_meta['height'];
675	$reqwidth = $size_array[0];
676	$reqheight = $size_array[1];
677
678	$constrained_size = wp_constrain_dimensions( $fullwidth, $fullheight, $reqwidth );
679	$expected_size = array( $reqwidth, $reqheight );
680
681	if ( abs( $constrained_size[0] - $expected_size[0] ) <= 1 && abs( $constrained_size[1] - $expected_size[1] ) <= 1 ) {
682	$crop = 'soft';
683	$base = Jetpack::get_content_width() ? Jetpack::get_content_width() : 1000; // Provide a default width if none set by the theme.
684	} else {
685	$crop = 'hard';
686	$base = $reqwidth;
687	}
688
689
690	$currentwidths = array_keys( $sources );
691	$newsources = null;
692
693	foreach ( $multipliers as $multiplier ) {
694
695	$newwidth = $base * $multiplier;
696	foreach ( $currentwidths as $currentwidth ){
697	// If a new width would be within 100 pixes of an existing one or larger than the full size image, skip.
698	if ( abs( $currentwidth - $newwidth ) < 50 \|\| ( $newwidth > $fullwidth ) ) {
699	continue 2; // Back to the foreach ( $multipliers as $multiplier )
700	}
701	} // foreach ( $currentwidths as $currentwidth ){
702
703	if ( 'soft' == $crop ) {
704	$args = array(
705	'w' => $newwidth,
706	);
707	} else { // hard crop, e.g. add_image_size( 'example', 200, 200, true );
708	$args = array(
709	'zoom' => $multiplier,
710	'resize' => $reqwidth . ',' . $reqheight,
711	);
712	}
713
714	$newsources[ $newwidth ] = array(
715	'url' => jetpack_photon_url( $url, $args ),
716	'descriptor' => 'w',
717	'value' => $newwidth,
718	);
719	} // foreach ( $multipliers as $multiplier )
720	if ( is_array( $newsources ) ) {
721	if ( function_exists( 'array_replace' ) ) { // PHP 5.3+, preferred
722	$sources = array_replace( $sources, $newsources );
723	} else { // For PHP 5.2 using WP shim function
724	$sources = array_replace_recursive( $sources, $newsources );
725	}
726	}
727	} // if ( isset( $image_meta['width'] ) && isset( $image_meta['file'] ) )
728
729	return $sources;
730	}
731
732	/**
733	* Filters an array of image `sizes` values, using $content_width instead of image's full size.
734	*
735	* @since 4.0.4
736	* @since 4.1.0 Returns early for images not within the_content.
737	* @param array $sizes An array of media query breakpoints.
738	* @param array $size Width and height of the image
739	* @uses Jetpack::get_content_width
740	* @return array An array of media query breakpoints.
741	*/
742	public function filter_sizes( $sizes, $size ) {
743	if ( ! doing_filter( 'the_content' ) ){
744	return $sizes;
745	}
746	$content_width = Jetpack::get_content_width();
747	if ( ! $content_width ) {
748	$content_width = 1000;
749	}
750
751	if ( ( is_array( $size ) && $size[0] < $content_width ) ) {
752	return $sizes;
753	}
754
755	return sprintf( '(max-width: %1$dpx) 100vw, %1$dpx', $content_width );
756	}
757
758	/**
759	** GENERAL FUNCTIONS
760	**/
761
762	/**
763	* Ensure image URL is valid for Photon.
764	* 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.
765	*
766	* @param string $url
767	* @uses wp_parse_args
768	* @return bool
769	*/
770	protected static function validate_image_url( $url ) {
771	$parsed_url = @parse_url( $url );
772
773	if ( ! $parsed_url )
774	return false;
775
776	// Parse URL and ensure needed keys exist, since the array returned by `parse_url` only includes the URL components it finds.
777	$url_info = wp_parse_args( $parsed_url, array(
778	'scheme' => null,
779	'host' => null,
780	'port' => null,
781	'path' => null
782	) );
783
784	// Bail if scheme isn't http or port is set that isn't port 80
785	if (
786	( 'http' != $url_info['scheme'] \|\| ! in_array( $url_info['port'], array( 80, null ) ) ) &&
787	/**
788	* Allow Photon to fetch images that are served via HTTPS.
789	*
790	* @module photon
791	*
792	* @since 2.4.0
793	* @since 3.9.0 Default to false.
794	*
795	* @param bool $reject_https Should Photon ignore images using the HTTPS scheme. Default to false.
796	*/
797	apply_filters( 'jetpack_photon_reject_https', false )
798	) {
799	return false;
800	}
801
802	// Bail if no host is found
803	if ( is_null( $url_info['host'] ) )
804	return false;
805
806	// Bail if the image alredy went through Photon
807	if ( preg_match( '#^i[\d]{1}.wp.com$#i', $url_info['host'] ) )
808	return false;
809
810	// Bail if no path is found
811	if ( is_null( $url_info['path'] ) )
812	return false;
813
814	// Ensure image extension is acceptable
815	if ( ! in_array( strtolower( pathinfo( $url_info['path'], PATHINFO_EXTENSION ) ), self::$extensions ) )
816	return false;
817
818	// If we got this far, we should have an acceptable image URL
819	// But let folks filter to decline if they prefer.
820	/**
821	* Overwrite the results of the validation steps an image goes through before to be considered valid to be used by Photon.
822	*
823	* @module photon
824	*
825	* @since 3.0.0
826	*
827	* @param bool true Is the image URL valid and can it be used by Photon. Default to true.
828	* @param string $url Image URL.
829	* @param array $parsed_url Array of information about the image.
830	*/
831	return apply_filters( 'photon_validate_image_url', true, $url, $parsed_url );
832	}
833
834	/**
835	* Checks if the file exists before it passes the file to photon
836	*
837	* @param string $src The image URL
838	* @return string
839	**/
840	protected static function strip_image_dimensions_maybe( $src ){
841	$stripped_src = $src;
842
843	// Build URL, first removing WP's resized string so we pass the original image to Photon
844	if ( preg_match( '#(-\d+x\d+)\.(' . implode('\|', self::$extensions ) . '){1}$#i', $src, $src_parts ) ) {
845	$stripped_src = str_replace( $src_parts[1], '', $src );
846	$upload_dir = wp_get_upload_dir();
847
848	// Extracts the file path to the image minus the base url
849	$file_path = substr( $stripped_src, strlen ( $upload_dir['baseurl'] ) );
850
851	if( file_exists( $upload_dir["basedir"] . $file_path ) )
852	$src = $stripped_src;
853	}
854
855	return $src;
856	}
857
858	/**
859	* Provide an array of available image sizes and corresponding dimensions.
860	* Similar to get_intermediate_image_sizes() except that it includes image sizes' dimensions, not just their names.
861	*
862	* @global $wp_additional_image_sizes
863	* @uses get_option
864	* @return array
865	*/
866	protected static function image_sizes() {
867	if ( null == self::$image_sizes ) {
868	global $_wp_additional_image_sizes;
869
870	// Populate an array matching the data structure of $_wp_additional_image_sizes so we have a consistent structure for image sizes
871	$images = array(
872	'thumb' => array(
873	'width' => intval( get_option( 'thumbnail_size_w' ) ),
874	'height' => intval( get_option( 'thumbnail_size_h' ) ),
875	'crop' => (bool) get_option( 'thumbnail_crop' )
876	),
877	'medium' => array(
878	'width' => intval( get_option( 'medium_size_w' ) ),
879	'height' => intval( get_option( 'medium_size_h' ) ),
880	'crop' => false
881	),
882	'large' => array(
883	'width' => intval( get_option( 'large_size_w' ) ),
884	'height' => intval( get_option( 'large_size_h' ) ),
885	'crop' => false
886	),
887	'full' => array(
888	'width' => null,
889	'height' => null,
890	'crop' => false
891	)
892	);
893
894	// Compatibility mapping as found in wp-includes/media.php
895	$images['thumbnail'] = $images['thumb'];
896
897	// Update class variable, merging in $_wp_additional_image_sizes if any are set
898	if ( is_array( $_wp_additional_image_sizes ) && ! empty( $_wp_additional_image_sizes ) )
899	self::$image_sizes = array_merge( $images, $_wp_additional_image_sizes );
900	else
901	self::$image_sizes = $images;
902	}
903
904	return is_array( self::$image_sizes ) ? self::$image_sizes : array();
905	}
906
907	/**
908	* Pass og:image URLs through Photon
909	*
910	* @param array $tags
911	* @param array $parameters
912	* @uses jetpack_photon_url
913	* @return array
914	*/
915	function filter_open_graph_tags( $tags, $parameters ) {
916	if ( empty( $tags['og:image'] ) ) {
917	return $tags;
918	}
919
920	$photon_args = array(
921	'fit' => sprintf( '%d,%d', 2 * $parameters['image_width'], 2 * $parameters['image_height'] ),
922	);
923
924	if ( is_array( $tags['og:image'] ) ) {
925	$images = array();
926	foreach ( $tags['og:image'] as $image ) {
927	$images[] = jetpack_photon_url( $image, $photon_args );
928	}
929	$tags['og:image'] = $images;
930	} else {
931	$tags['og:image'] = jetpack_photon_url( $tags['og:image'], $photon_args );
932	}
933
934	return $tags;
935	}
936
937	/**
938	* Enqueue Photon helper script
939	*
940	* @uses wp_enqueue_script, plugins_url
941	* @action wp_enqueue_script
942	* @return null
943	*/
944	public function action_wp_enqueue_scripts() {
945	wp_enqueue_script( 'jetpack-photon', plugins_url( 'modules/photon/photon.js', JETPACK__PLUGIN_FILE ), array( 'jquery' ), 20130122, true );
946	}
947	}
948