forked from Automattic/jetpack
-
Notifications
You must be signed in to change notification settings - Fork 0
/
class.photon.php
1103 lines (946 loc) · 39.9 KB
/
class.photon.php
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
<?php
class Jetpack_Photon {
/**
* Class variables
*/
// Oh look, a singleton
private static $__instance = null;
// Allowed extensions must match http://code.trac.wordpress.org/browser/photon/index.php#L31
protected static $extensions = array(
'gif',
'jpg',
'jpeg',
'png'
);
// Don't access this directly. Instead, use self::image_sizes() so it's actually populated with something.
protected static $image_sizes = null;
/**
* Singleton implementation
*
* @return object
*/
public static function instance() {
if ( ! is_a( self::$__instance, 'Jetpack_Photon' ) ) {
self::$__instance = new Jetpack_Photon;
self::$__instance->setup();
}
return self::$__instance;
}
/**
* Silence is golden.
*/
private function __construct() {}
/**
* Register actions and filters, but only if basic Photon functions are available.
* The basic functions are found in ./functions.photon.php.
*
* @uses add_action, add_filter
* @return null
*/
private function setup() {
if ( ! function_exists( 'jetpack_photon_url' ) ) {
return;
}
// Images in post content and galleries
add_filter( 'the_content', array( __CLASS__, 'filter_the_content' ), 999999 );
add_filter( 'get_post_galleries', array( __CLASS__, 'filter_the_galleries' ), 999999 );
add_filter( 'widget_media_image_instance', array( __CLASS__, 'filter_the_image_widget' ), 999999 );
// Core image retrieval
add_filter( 'image_downsize', array( $this, 'filter_image_downsize' ), 10, 3 );
add_filter( 'rest_request_before_callbacks', array( $this, 'should_rest_photon_image_downsize' ), 10, 3 );
add_filter( 'rest_request_after_callbacks', array( $this, 'cleanup_rest_photon_image_downsize' ) );
// Responsive image srcset substitution
add_filter( 'wp_calculate_image_srcset', array( $this, 'filter_srcset_array' ), 10, 5 );
add_filter( 'wp_calculate_image_sizes', array( $this, 'filter_sizes' ), 1, 2 ); // Early so themes can still easily filter.
// Helpers for maniuplated images
add_action( 'wp_enqueue_scripts', array( $this, 'action_wp_enqueue_scripts' ), 9 );
}
/**
** IN-CONTENT IMAGE MANIPULATION FUNCTIONS
**/
/**
* Match all images and any relevant <a> tags in a block of HTML.
*
* @param string $content Some HTML.
* @return array An array of $images matches, where $images[0] is
* an array of full matches, and the link_url, img_tag,
* and img_url keys are arrays of those matches.
*/
public static function parse_images_from_html( $content ) {
$images = array();
if ( preg_match_all( '#(?:<a[^>]+?href=["|\'](?P<link_url>[^\s]+?)["|\'][^>]*?>\s*)?(?P<img_tag><img[^>]*?\s+?src=["|\'](?P<img_url>[^\s]+?)["|\'].*?>){1}(?:\s*</a>)?#is', $content, $images ) ) {
foreach ( $images as $key => $unused ) {
// Simplify the output as much as possible, mostly for confirming test results.
if ( is_numeric( $key ) && $key > 0 )
unset( $images[$key] );
}
return $images;
}
return array();
}
/**
* Try to determine height and width from strings WP appends to resized image filenames.
*
* @param string $src The image URL.
* @return array An array consisting of width and height.
*/
public static function parse_dimensions_from_filename( $src ) {
$width_height_string = array();
if ( preg_match( '#-(\d+)x(\d+)\.(?:' . implode('|', self::$extensions ) . '){1}$#i', $src, $width_height_string ) ) {
$width = (int) $width_height_string[1];
$height = (int) $width_height_string[2];
if ( $width && $height )
return array( $width, $height );
}
return array( false, false );
}
/**
* Identify images in post content, and if images are local (uploaded to the current site), pass through Photon.
*
* @param string $content
* @uses self::validate_image_url, apply_filters, jetpack_photon_url, esc_url
* @filter the_content
* @return string
*/
public static function filter_the_content( $content ) {
$images = Jetpack_Photon::parse_images_from_html( $content );
if ( ! empty( $images ) ) {
$content_width = Jetpack::get_content_width();
$image_sizes = self::image_sizes();
$upload_dir = wp_get_upload_dir();
foreach ( $images[0] as $index => $tag ) {
// Default to resize, though fit may be used in certain cases where a dimension cannot be ascertained
$transform = 'resize';
// Start with a clean attachment ID each time
$attachment_id = false;
// Flag if we need to munge a fullsize URL
$fullsize_url = false;
// Identify image source
$src = $src_orig = $images['img_url'][ $index ];
/**
* Allow specific images to be skipped by Photon.
*
* @module photon
*
* @since 2.0.3
*
* @param bool false Should Photon ignore this image. Default to false.
* @param string $src Image URL.
* @param string $tag Image Tag (Image HTML output).
*/
if ( apply_filters( 'jetpack_photon_skip_image', false, $src, $tag ) )
continue;
// Support Automattic's Lazy Load plugin
// Can't modify $tag yet as we need unadulterated version later
if ( preg_match( '#data-lazy-src=["|\'](.+?)["|\']#i', $images['img_tag'][ $index ], $lazy_load_src ) ) {
$placeholder_src = $placeholder_src_orig = $src;
$src = $src_orig = $lazy_load_src[1];
} elseif ( preg_match( '#data-lazy-original=["|\'](.+?)["|\']#i', $images['img_tag'][ $index ], $lazy_load_src ) ) {
$placeholder_src = $placeholder_src_orig = $src;
$src = $src_orig = $lazy_load_src[1];
}
// Check if image URL should be used with Photon
if ( self::validate_image_url( $src ) ) {
// Find the width and height attributes
$width = $height = false;
// First, check the image tag
if ( preg_match( '#width=["|\']?([\d%]+)["|\']?#i', $images['img_tag'][ $index ], $width_string ) )
$width = $width_string[1];
if ( preg_match( '#height=["|\']?([\d%]+)["|\']?#i', $images['img_tag'][ $index ], $height_string ) )
$height = $height_string[1];
// Can't pass both a relative width and height, so unset the height in favor of not breaking the horizontal layout.
if ( false !== strpos( $width, '%' ) && false !== strpos( $height, '%' ) )
$width = $height = false;
// Detect WP registered image size from HTML class
if ( preg_match( '#class=["|\']?[^"\']*size-([^"\'\s]+)[^"\']*["|\']?#i', $images['img_tag'][ $index ], $size ) ) {
$size = array_pop( $size );
if ( false === $width && false === $height && 'full' != $size && array_key_exists( $size, $image_sizes ) ) {
$width = (int) $image_sizes[ $size ]['width'];
$height = (int) $image_sizes[ $size ]['height'];
$transform = $image_sizes[ $size ]['crop'] ? 'resize' : 'fit';
}
} else {
unset( $size );
}
// WP Attachment ID, if uploaded to this site
if (
preg_match( '#class=["|\']?[^"\']*wp-image-([\d]+)[^"\']*["|\']?#i', $images['img_tag'][ $index ], $attachment_id ) &&
0 === strpos( $src, $upload_dir['baseurl'] ) &&
/**
* Filter whether an image using an attachment ID in its class has to be uploaded to the local site to go through Photon.
*
* @module photon
*
* @since 2.0.3
*
* @param bool false Was the image uploaded to the local site. Default to false.
* @param array $args {
* Array of image details.
*
* @type $src Image URL.
* @type tag Image tag (Image HTML output).
* @type $images Array of information about the image.
* @type $index Image index.
* }
*/
apply_filters( 'jetpack_photon_image_is_local', false, compact( 'src', 'tag', 'images', 'index' ) )
) {
$attachment_id = intval( array_pop( $attachment_id ) );
if ( $attachment_id ) {
$attachment = get_post( $attachment_id );
// Basic check on returned post object
if ( is_object( $attachment ) && ! is_wp_error( $attachment ) && 'attachment' == $attachment->post_type ) {
$src_per_wp = wp_get_attachment_image_src( $attachment_id, isset( $size ) ? $size : 'full' );
if ( self::validate_image_url( $src_per_wp[0] ) ) {
$src = $src_per_wp[0];
$fullsize_url = true;
// Prevent image distortion if a detected dimension exceeds the image's natural dimensions
if ( ( false !== $width && $width > $src_per_wp[1] ) || ( false !== $height && $height > $src_per_wp[2] ) ) {
$width = false === $width ? false : min( $width, $src_per_wp[1] );
$height = false === $height ? false : min( $height, $src_per_wp[2] );
}
// If no width and height are found, max out at source image's natural dimensions
// Otherwise, respect registered image sizes' cropping setting
if ( false === $width && false === $height ) {
$width = $src_per_wp[1];
$height = $src_per_wp[2];
$transform = 'fit';
} elseif ( isset( $size ) && array_key_exists( $size, $image_sizes ) && isset( $image_sizes[ $size ]['crop'] ) ) {
$transform = (bool) $image_sizes[ $size ]['crop'] ? 'resize' : 'fit';
}
}
} else {
unset( $attachment_id );
unset( $attachment );
}
}
}
// If image tag lacks width and height arguments, try to determine from strings WP appends to resized image filenames.
if ( false === $width && false === $height ) {
list( $width, $height ) = Jetpack_Photon::parse_dimensions_from_filename( $src );
}
// If width is available, constrain to $content_width
if ( false !== $width && false === strpos( $width, '%' ) && is_numeric( $content_width ) ) {
if ( $width > $content_width && false !== $height && false === strpos( $height, '%' ) ) {
$height = round( ( $content_width * $height ) / $width );
$width = $content_width;
} elseif ( $width > $content_width ) {
$width = $content_width;
}
}
// Set a width if none is found and $content_width is available
// If width is set in this manner and height is available, use `fit` instead of `resize` to prevent skewing
if ( false === $width && is_numeric( $content_width ) ) {
$width = (int) $content_width;
if ( false !== $height )
$transform = 'fit';
}
// Detect if image source is for a custom-cropped thumbnail and prevent further URL manipulation.
if ( ! $fullsize_url && preg_match_all( '#-e[a-z0-9]+(-\d+x\d+)?\.(' . implode('|', self::$extensions ) . '){1}$#i', basename( $src ), $filename ) )
$fullsize_url = true;
// Build URL, first maybe removing WP's resized string so we pass the original image to Photon
if ( ! $fullsize_url ) {
$src = self::strip_image_dimensions_maybe( $src );
}
// Build array of Photon args and expose to filter before passing to Photon URL function
$args = array();
if ( false !== $width && false !== $height && false === strpos( $width, '%' ) && false === strpos( $height, '%' ) )
$args[ $transform ] = $width . ',' . $height;
elseif ( false !== $width )
$args['w'] = $width;
elseif ( false !== $height )
$args['h'] = $height;
/**
* Filter the array of Photon arguments added to an image when it goes through Photon.
* By default, only includes width and height values.
* @see https://developer.wordpress.com/docs/photon/api/
*
* @module photon
*
* @since 2.0.0
*
* @param array $args Array of Photon Arguments.
* @param array $args {
* Array of image details.
*
* @type $tag Image tag (Image HTML output).
* @type $src Image URL.
* @type $src_orig Original Image URL.
* @type $width Image width.
* @type $height Image height.
* }
*/
$args = apply_filters( 'jetpack_photon_post_image_args', $args, compact( 'tag', 'src', 'src_orig', 'width', 'height' ) );
$photon_url = jetpack_photon_url( $src, $args );
// Modify image tag if Photon function provides a URL
// Ensure changes are only applied to the current image by copying and modifying the matched tag, then replacing the entire tag with our modified version.
if ( $src != $photon_url ) {
$new_tag = $tag;
// If present, replace the link href with a Photoned URL for the full-size image.
if ( ! empty( $images['link_url'][ $index ] ) && self::validate_image_url( $images['link_url'][ $index ] ) )
$new_tag = preg_replace( '#(href=["|\'])' . $images['link_url'][ $index ] . '(["|\'])#i', '\1' . jetpack_photon_url( $images['link_url'][ $index ] ) . '\2', $new_tag, 1 );
// Supplant the original source value with our Photon URL
$photon_url = esc_url( $photon_url );
$new_tag = str_replace( $src_orig, $photon_url, $new_tag );
// If Lazy Load is in use, pass placeholder image through Photon
if ( isset( $placeholder_src ) && self::validate_image_url( $placeholder_src ) ) {
$placeholder_src = jetpack_photon_url( $placeholder_src );
if ( $placeholder_src != $placeholder_src_orig )
$new_tag = str_replace( $placeholder_src_orig, esc_url( $placeholder_src ), $new_tag );
unset( $placeholder_src );
}
// If we are not transforming the image with resize, fit, or letterbox (lb), then we should remove
// the width and height arguments from the image to prevent distortion. Even if $args['w'] and $args['h']
// are present, Photon does not crop to those dimensions. Instead, it appears to favor height.
//
// If we are transforming the image via one of those methods, let's update the width and height attributes.
if ( empty( $args['resize'] ) && empty( $args['fit'] ) && empty( $args['lb'] ) ) {
$new_tag = preg_replace( '#(?<=\s)(width|height)=["|\']?[\d%]+["|\']?\s?#i', '', $new_tag );
} else {
$resize_args = isset( $args['resize'] ) ? $args['resize'] : false;
if ( false == $resize_args ) {
$resize_args = ( ! $resize_args && isset( $args['fit'] ) )
? $args['fit']
: false;
}
if ( false == $resize_args ) {
$resize_args = ( ! $resize_args && isset( $args['lb'] ) )
? $args['lb']
: false;
}
$resize_args = array_map( 'trim', explode( ',', $resize_args ) );
// (?<=\s) - Ensure width or height attribute is preceded by a space
// (width=["|\']?) - Matches, and captures, width=, width=", or width='
// [\d%]+ - Matches 1 or more digits
// (["|\']?) - Matches, and captures, ", ', or empty string
// \s - Ensures there's a space after the attribute
$new_tag = preg_replace( '#(?<=\s)(width=["|\']?)[\d%]+(["|\']?)\s?#i', sprintf( '${1}%d${2} ', $resize_args[0] ), $new_tag );
$new_tag = preg_replace( '#(?<=\s)(height=["|\']?)[\d%]+(["|\']?)\s?#i', sprintf( '${1}%d${2} ', $resize_args[1] ), $new_tag );
}
// Tag an image for dimension checking
$new_tag = preg_replace( '#(\s?/)?>(\s*</a>)?$#i', ' data-recalc-dims="1"\1>\2', $new_tag );
// Replace original tag with modified version
$content = str_replace( $tag, $new_tag, $content );
}
} elseif ( preg_match( '#^http(s)?://i[\d]{1}.wp.com#', $src ) && ! empty( $images['link_url'][ $index ] ) && self::validate_image_url( $images['link_url'][ $index ] ) ) {
$new_tag = preg_replace( '#(href=["|\'])' . $images['link_url'][ $index ] . '(["|\'])#i', '\1' . jetpack_photon_url( $images['link_url'][ $index ] ) . '\2', $tag, 1 );
$content = str_replace( $tag, $new_tag, $content );
}
}
}
return $content;
}
public static function filter_the_galleries( $galleries ) {
if ( empty( $galleries ) || ! is_array( $galleries ) ) {
return $galleries;
}
// Pass by reference, so we can modify them in place.
foreach ( $galleries as &$this_gallery ) {
if ( is_string( $this_gallery ) ) {
$this_gallery = self::filter_the_content( $this_gallery );
// LEAVING COMMENTED OUT as for the moment it doesn't seem
// necessary and I'm not sure how it would propagate through.
// } elseif ( is_array( $this_gallery )
// && ! empty( $this_gallery['src'] )
// && ! empty( $this_gallery['type'] )
// && in_array( $this_gallery['type'], array( 'rectangle', 'square', 'circle' ) ) ) {
// $this_gallery['src'] = array_map( 'jetpack_photon_url', $this_gallery['src'] );
}
}
unset( $this_gallery ); // break the reference.
return $galleries;
}
/**
* Runs the image widget through photon.
*
* @param array $instance Image widget instance data.
* @return array
*/
public static function filter_the_image_widget( $instance ) {
if ( Jetpack::is_module_active( 'photon' ) && ! $instance['attachment_id'] && $instance['url'] ) {
jetpack_photon_url( $instance['url'], array(
'w' => $instance['width'],
'h' => $instance['height'],
) );
}
return $instance;
}
/**
** CORE IMAGE RETRIEVAL
**/
/**
* Filter post thumbnail image retrieval, passing images through Photon
*
* @param string|bool $image
* @param int $attachment_id
* @param string|array $size
* @uses is_admin, apply_filters, wp_get_attachment_url, self::validate_image_url, this::image_sizes, jetpack_photon_url
* @filter image_downsize
* @return string|bool
*/
public function filter_image_downsize( $image, $attachment_id, $size ) {
// Don't foul up the admin side of things, unless a plugin wants to.
if ( is_admin() &&
/**
* Provide plugins a way of running Photon for images in the WordPress Dashboard (wp-admin).
*
* Note: enabling this will result in Photon URLs added to your post content, which could make migrations across domains (and off Photon) a bit more challenging.
*
* @module photon
*
* @since 4.8.0
*
* @param bool false Stop Photon from being run on the Dashboard. Default to false.
* @param array $args {
* Array of image details.
*
* @type $image Image URL.
* @type $attachment_id Attachment ID of the image.
* @type $size Image size. Can be a string (name of the image size, e.g. full) or an array of width and height.
* }
*/
false === apply_filters( 'jetpack_photon_admin_allow_image_downsize', false, compact( 'image', 'attachment_id', 'size' ) )
) {
return $image;
}
/**
* Provide plugins a way of preventing Photon from being applied to images retrieved from WordPress Core.
*
* @module photon
*
* @since 2.0.0
*
* @param bool false Stop Photon from being applied to the image. Default to false.
* @param array $args {
* Array of image details.
*
* @type $image Image URL.
* @type $attachment_id Attachment ID of the image.
* @type $size Image size. Can be a string (name of the image size, e.g. full) or an array of width and height.
* }
*/
if ( apply_filters( 'jetpack_photon_override_image_downsize', false, compact( 'image', 'attachment_id', 'size' ) ) ) {
return $image;
}
// Get the image URL and proceed with Photon-ification if successful
$image_url = wp_get_attachment_url( $attachment_id );
// Set this to true later when we know we have size meta.
$has_size_meta = false;
if ( $image_url ) {
// Check if image URL should be used with Photon
if ( ! self::validate_image_url( $image_url ) )
return $image;
$intermediate = true; // For the fourth array item returned by the image_downsize filter.
// If an image is requested with a size known to WordPress, use that size's settings with Photon.
// WP states that `add_image_size()` should use a string for the name, but doesn't enforce that.
// Due to differences in how Core and Photon check for the registered image size, we check both types.
if ( ( is_string( $size ) || is_int( $size ) ) && array_key_exists( $size, self::image_sizes() ) ) {
$image_args = self::image_sizes();
$image_args = $image_args[ $size ];
$photon_args = array();
$image_meta = image_get_intermediate_size( $attachment_id, $size );
// 'full' is a special case: We need consistent data regardless of the requested size.
if ( 'full' == $size ) {
$image_meta = wp_get_attachment_metadata( $attachment_id );
$intermediate = false;
} elseif ( ! $image_meta ) {
// If we still don't have any image meta at this point, it's probably from a custom thumbnail size
// for an image that was uploaded before the custom image was added to the theme. Try to determine the size manually.
$image_meta = wp_get_attachment_metadata( $attachment_id );
if ( isset( $image_meta['width'], $image_meta['height'] ) ) {
$image_resized = image_resize_dimensions( $image_meta['width'], $image_meta['height'], $image_args['width'], $image_args['height'], $image_args['crop'] );
if ( $image_resized ) { // This could be false when the requested image size is larger than the full-size image.
$image_meta['width'] = $image_resized[6];
$image_meta['height'] = $image_resized[7];
}
}
}
if ( isset( $image_meta['width'], $image_meta['height'] ) ) {
$image_args['width'] = $image_meta['width'];
$image_args['height'] = $image_meta['height'];
list( $image_args['width'], $image_args['height'] ) = image_constrain_size_for_editor( $image_args['width'], $image_args['height'], $size, 'display' );
$has_size_meta = true;
}
// Expose determined arguments to a filter before passing to Photon
$transform = $image_args['crop'] ? 'resize' : 'fit';
// Check specified image dimensions and account for possible zero values; photon fails to resize if a dimension is zero.
if ( 0 == $image_args['width'] || 0 == $image_args['height'] ) {
if ( 0 == $image_args['width'] && 0 < $image_args['height'] ) {
$photon_args['h'] = $image_args['height'];
} elseif ( 0 == $image_args['height'] && 0 < $image_args['width'] ) {
$photon_args['w'] = $image_args['width'];
}
} else {
if ( ( 'resize' === $transform ) && $image_meta = wp_get_attachment_metadata( $attachment_id ) ) {
if ( isset( $image_meta['width'], $image_meta['height'] ) ) {
// Lets make sure that we don't upscale images since wp never upscales them as well
$smaller_width = ( ( $image_meta['width'] < $image_args['width'] ) ? $image_meta['width'] : $image_args['width'] );
$smaller_height = ( ( $image_meta['height'] < $image_args['height'] ) ? $image_meta['height'] : $image_args['height'] );
$photon_args[ $transform ] = $smaller_width . ',' . $smaller_height;
}
} else {
$photon_args[ $transform ] = $image_args['width'] . ',' . $image_args['height'];
}
}
/**
* Filter the Photon Arguments added to an image when going through Photon, when that image size is a string.
* Image size will be a string (e.g. "full", "medium") when it is known to WordPress.
*
* @module photon
*
* @since 2.0.0
*
* @param array $photon_args Array of Photon arguments.
* @param array $args {
* Array of image details.
*
* @type $image_args Array of Image arguments (width, height, crop).
* @type $image_url Image URL.
* @type $attachment_id Attachment ID of the image.
* @type $size Image size. Can be a string (name of the image size, e.g. full) or an integer.
* @type $transform Value can be resize or fit.
* @see https://developer.wordpress.com/docs/photon/api
* }
*/
$photon_args = apply_filters( 'jetpack_photon_image_downsize_string', $photon_args, compact( 'image_args', 'image_url', 'attachment_id', 'size', 'transform' ) );
// Generate Photon URL
$image = array(
jetpack_photon_url( $image_url, $photon_args ),
$has_size_meta ? $image_args['width'] : false,
$has_size_meta ? $image_args['height'] : false,
$intermediate
);
} elseif ( is_array( $size ) ) {
// Pull width and height values from the provided array, if possible
$width = isset( $size[0] ) ? (int) $size[0] : false;
$height = isset( $size[1] ) ? (int) $size[1] : false;
// Don't bother if necessary parameters aren't passed.
if ( ! $width || ! $height ) {
return $image;
}
$image_meta = wp_get_attachment_metadata( $attachment_id );
if ( isset( $image_meta['width'], $image_meta['height'] ) ) {
$image_resized = image_resize_dimensions( $image_meta['width'], $image_meta['height'], $width, $height );
if ( $image_resized ) { // This could be false when the requested image size is larger than the full-size image.
$width = $image_resized[6];
$height = $image_resized[7];
} else {
$width = $image_meta['width'];
$height = $image_meta['height'];
}
$has_size_meta = true;
}
list( $width, $height ) = image_constrain_size_for_editor( $width, $height, $size );
// Expose arguments to a filter before passing to Photon
$photon_args = array(
'fit' => $width . ',' . $height
);
/**
* Filter the Photon Arguments added to an image when going through Photon,
* when the image size is an array of height and width values.
*
* @module photon
*
* @since 2.0.0
*
* @param array $photon_args Array of Photon arguments.
* @param array $args {
* Array of image details.
*
* @type $width Image width.
* @type height Image height.
* @type $image_url Image URL.
* @type $attachment_id Attachment ID of the image.
* }
*/
$photon_args = apply_filters( 'jetpack_photon_image_downsize_array', $photon_args, compact( 'width', 'height', 'image_url', 'attachment_id' ) );
// Generate Photon URL
$image = array(
jetpack_photon_url( $image_url, $photon_args ),
$has_size_meta ? $width : false,
$has_size_meta ? $height : false,
$intermediate
);
}
}
return $image;
}
/**
* Filters an array of image `srcset` values, replacing each URL with its Photon equivalent.
*
* @since 3.8.0
* @since 4.0.4 Added automatically additional sizes beyond declared image sizes.
* @param array $sources An array of image urls and widths.
* @uses self::validate_image_url, jetpack_photon_url, Jetpack_Photon::parse_from_filename
* @uses Jetpack_Photon::strip_image_dimensions_maybe, Jetpack::get_content_width
* @return array An array of Photon image urls and widths.
*/
public function filter_srcset_array( $sources = array(), $size_array = array(), $image_src = array(), $image_meta = array(), $attachment_id = 0 ) {
if ( ! is_array( $sources ) ) {
return $sources;
}
$upload_dir = wp_get_upload_dir();
foreach ( $sources as $i => $source ) {
if ( ! self::validate_image_url( $source['url'] ) ) {
continue;
}
/** This filter is already documented in class.photon.php */
if ( apply_filters( 'jetpack_photon_skip_image', false, $source['url'], $source ) ) {
continue;
}
$url = $source['url'];
list( $width, $height ) = Jetpack_Photon::parse_dimensions_from_filename( $url );
// It's quicker to get the full size with the data we have already, if available
if ( ! empty( $attachment_id ) ) {
$url = wp_get_attachment_url( $attachment_id );
} else {
$url = Jetpack_Photon::strip_image_dimensions_maybe( $url );
}
$args = array();
if ( 'w' === $source['descriptor'] ) {
if ( $height && ( $source['value'] == $width ) ) {
$args['resize'] = $width . ',' . $height;
} else {
$args['w'] = $source['value'];
}
}
$sources[ $i ]['url'] = jetpack_photon_url( $url, $args );
}
/**
* At this point, $sources is the original srcset with Photonized URLs.
* Now, we're going to construct additional sizes based on multiples of the content_width.
* This will reduce the gap between the largest defined size and the original image.
*/
/**
* Filter the multiplier Photon uses to create new srcset items.
* Return false to short-circuit and bypass auto-generation.
*
* @module photon
*
* @since 4.0.4
*
* @param array|bool $multipliers Array of multipliers to use or false to bypass.
*/
$multipliers = apply_filters( 'jetpack_photon_srcset_multipliers', array( 2, 3 ) );
$url = trailingslashit( $upload_dir['baseurl'] ) . $image_meta['file'];
if (
/** Short-circuit via jetpack_photon_srcset_multipliers filter. */
is_array( $multipliers )
/** This filter is already documented in class.photon.php */
&& ! apply_filters( 'jetpack_photon_skip_image', false, $url, null )
/** Verify basic meta is intact. */
&& isset( $image_meta['width'] ) && isset( $image_meta['height'] ) && isset( $image_meta['file'] )
/** Verify we have the requested width/height. */
&& isset( $size_array[0] ) && isset( $size_array[1] )
) {
$fullwidth = $image_meta['width'];
$fullheight = $image_meta['height'];
$reqwidth = $size_array[0];
$reqheight = $size_array[1];
$constrained_size = wp_constrain_dimensions( $fullwidth, $fullheight, $reqwidth );
$expected_size = array( $reqwidth, $reqheight );
if ( abs( $constrained_size[0] - $expected_size[0] ) <= 1 && abs( $constrained_size[1] - $expected_size[1] ) <= 1 ) {
$crop = 'soft';
$base = Jetpack::get_content_width() ? Jetpack::get_content_width() : 1000; // Provide a default width if none set by the theme.
} else {
$crop = 'hard';
$base = $reqwidth;
}
$currentwidths = array_keys( $sources );
$newsources = null;
foreach ( $multipliers as $multiplier ) {
$newwidth = $base * $multiplier;
foreach ( $currentwidths as $currentwidth ){
// If a new width would be within 100 pixes of an existing one or larger than the full size image, skip.
if ( abs( $currentwidth - $newwidth ) < 50 || ( $newwidth > $fullwidth ) ) {
continue 2; // Back to the foreach ( $multipliers as $multiplier )
}
} // foreach ( $currentwidths as $currentwidth ){
if ( 'soft' == $crop ) {
$args = array(
'w' => $newwidth,
);
} else { // hard crop, e.g. add_image_size( 'example', 200, 200, true );
$args = array(
'zoom' => $multiplier,
'resize' => $reqwidth . ',' . $reqheight,
);
}
$newsources[ $newwidth ] = array(
'url' => jetpack_photon_url( $url, $args ),
'descriptor' => 'w',
'value' => $newwidth,
);
} // foreach ( $multipliers as $multiplier )
if ( is_array( $newsources ) ) {
if ( function_exists( 'array_replace' ) ) { // PHP 5.3+, preferred
$sources = array_replace( $sources, $newsources ); // phpcs:ignore PHPCompatibility.PHP.NewFunctions.array_replaceFound
} else { // For PHP 5.2 using WP shim function
$sources = array_replace_recursive( $sources, $newsources );
}
}
} // if ( isset( $image_meta['width'] ) && isset( $image_meta['file'] ) )
return $sources;
}
/**
* Filters an array of image `sizes` values, using $content_width instead of image's full size.
*
* @since 4.0.4
* @since 4.1.0 Returns early for images not within the_content.
* @param array $sizes An array of media query breakpoints.
* @param array $size Width and height of the image
* @uses Jetpack::get_content_width
* @return array An array of media query breakpoints.
*/
public function filter_sizes( $sizes, $size ) {
if ( ! doing_filter( 'the_content' ) ){
return $sizes;
}
$content_width = Jetpack::get_content_width();
if ( ! $content_width ) {
$content_width = 1000;
}
if ( ( is_array( $size ) && $size[0] < $content_width ) ) {
return $sizes;
}
return sprintf( '(max-width: %1$dpx) 100vw, %1$dpx', $content_width );
}
/**
** GENERAL FUNCTIONS
**/
/**
* Ensure image URL is valid for Photon.
* Though Photon functions address some of the URL issues, we should avoid unnecessary processing if we know early on that the image isn't supported.
*
* @param string $url
* @uses wp_parse_args
* @return bool
*/
protected static function validate_image_url( $url ) {
$parsed_url = @parse_url( $url );
if ( ! $parsed_url )
return false;
// Parse URL and ensure needed keys exist, since the array returned by `parse_url` only includes the URL components it finds.
$url_info = wp_parse_args( $parsed_url, array(
'scheme' => null,
'host' => null,
'port' => null,
'path' => null
) );
// Bail if scheme isn't http or port is set that isn't port 80
if (
( 'http' != $url_info['scheme'] || ! in_array( $url_info['port'], array( 80, null ) ) ) &&
/**
* Allow Photon to fetch images that are served via HTTPS.
*
* @module photon
*
* @since 2.4.0
* @since 3.9.0 Default to false.
*
* @param bool $reject_https Should Photon ignore images using the HTTPS scheme. Default to false.
*/
apply_filters( 'jetpack_photon_reject_https', false )
) {
return false;
}
// Bail if no host is found
if ( is_null( $url_info['host'] ) )
return false;
// Bail if the image alredy went through Photon
if ( preg_match( '#^i[\d]{1}.wp.com$#i', $url_info['host'] ) )
return false;
// Bail if no path is found
if ( is_null( $url_info['path'] ) )
return false;
// Ensure image extension is acceptable
if ( ! in_array( strtolower( pathinfo( $url_info['path'], PATHINFO_EXTENSION ) ), self::$extensions ) )
return false;
// If we got this far, we should have an acceptable image URL
// But let folks filter to decline if they prefer.
/**
* Overwrite the results of the validation steps an image goes through before to be considered valid to be used by Photon.
*
* @module photon
*
* @since 3.0.0
*
* @param bool true Is the image URL valid and can it be used by Photon. Default to true.
* @param string $url Image URL.
* @param array $parsed_url Array of information about the image.
*/
return apply_filters( 'photon_validate_image_url', true, $url, $parsed_url );
}
/**
* Checks if the file exists before it passes the file to photon
*
* @param string $src The image URL
* @return string
**/
protected static function strip_image_dimensions_maybe( $src ){
$stripped_src = $src;
// Build URL, first removing WP's resized string so we pass the original image to Photon
if ( preg_match( '#(-\d+x\d+)\.(' . implode('|', self::$extensions ) . '){1}$#i', $src, $src_parts ) ) {
$stripped_src = str_replace( $src_parts[1], '', $src );
$upload_dir = wp_get_upload_dir();
// Extracts the file path to the image minus the base url
$file_path = substr( $stripped_src, strlen ( $upload_dir['baseurl'] ) );
if( file_exists( $upload_dir["basedir"] . $file_path ) )
$src = $stripped_src;
}
return $src;
}
/**
* Provide an array of available image sizes and corresponding dimensions.
* Similar to get_intermediate_image_sizes() except that it includes image sizes' dimensions, not just their names.
*
* @global $wp_additional_image_sizes
* @uses get_option
* @return array
*/
protected static function image_sizes() {
if ( null == self::$image_sizes ) {
global $_wp_additional_image_sizes;
// Populate an array matching the data structure of $_wp_additional_image_sizes so we have a consistent structure for image sizes
$images = array(
'thumb' => array(
'width' => intval( get_option( 'thumbnail_size_w' ) ),
'height' => intval( get_option( 'thumbnail_size_h' ) ),
'crop' => (bool) get_option( 'thumbnail_crop' )
),
'medium' => array(
'width' => intval( get_option( 'medium_size_w' ) ),
'height' => intval( get_option( 'medium_size_h' ) ),
'crop' => false
),
'large' => array(
'width' => intval( get_option( 'large_size_w' ) ),
'height' => intval( get_option( 'large_size_h' ) ),
'crop' => false
),
'full' => array(
'width' => null,
'height' => null,
'crop' => false
)
);
// Compatibility mapping as found in wp-includes/media.php
$images['thumbnail'] = $images['thumb'];
// Update class variable, merging in $_wp_additional_image_sizes if any are set
if ( is_array( $_wp_additional_image_sizes ) && ! empty( $_wp_additional_image_sizes ) )
self::$image_sizes = array_merge( $images, $_wp_additional_image_sizes );
else
self::$image_sizes = $images;
}
return is_array( self::$image_sizes ) ? self::$image_sizes : array();
}
/**
* Pass og:image URLs through Photon
*
* @param array $tags
* @param array $parameters
* @uses jetpack_photon_url
* @return array
*/
function filter_open_graph_tags( $tags, $parameters ) {
if ( empty( $tags['og:image'] ) ) {
return $tags;
}
$photon_args = array(
'fit' => sprintf( '%d,%d', 2 * $parameters['image_width'], 2 * $parameters['image_height'] ),
);
if ( is_array( $tags['og:image'] ) ) {
$images = array();