Jetpack_Lazy_Images::allow_lazy_attributes() - Code Metrics - Inspection of "updating contributors in readme.md" - Automattic/jetpack - Measure and Improve Code Quality continuously with Scrutinizer

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created 2020-08-24 17:28 UTC

Jetpack_Lazy_Images::allow_lazy_attributes() A

↳ Parent: Jetpack_Lazy_Images

Complexity

Conditions	2
Paths	2

Size

Total Lines

Duplication

Lines	0
Ratio	0 %

Importance

Changes

Metric	Value
cc	2
nc	2
nop	1
dl	0
loc	16
rs	9.7333
c	0
b	0
f	0

<?php

use Automattic\Jetpack\Assets;

class Jetpack_Lazy_Images {
	private static $__instance = null;

	/**
	 * Singleton implementation
	 *
	 * @return object
	 */
	public static function instance() {
		if ( is_null( self::$__instance ) ) {
			self::$__instance = new Jetpack_Lazy_Images();
		}

		return self::$__instance;
	}

	/**
	 * Registers actions
	 */
	private function __construct() {
		if ( is_admin() ) {
			return;
		}

		/**
		 * Whether the lazy-images module should load.
		 *
		 * This filter is not prefixed with jetpack_ to provide a smoother migration
		 * process from the WordPress Lazy Load plugin.
		 *
		 * @module lazy-images
		 *
		 * @since 5.6.0
		 *
		 * @param bool true Whether lazy image loading should occur.
		 */
		if ( ! apply_filters( 'lazyload_is_enabled', true ) ) {
			return;
		}

		if ( Jetpack_AMP_Support::is_amp_request() ) {
			return;
		}

		add_action( 'wp_head', array( $this, 'setup_filters' ), 9999 ); // we don't really want to modify anything in <head> since it's mostly all metadata
		add_action( 'wp_enqueue_scripts', array( $this, 'enqueue_assets' ) );

		// Do not lazy load avatar in admin bar
		add_action( 'admin_bar_menu', array( $this, 'remove_filters' ), 0 );

		add_filter( 'wp_kses_allowed_html', array( $this, 'allow_lazy_attributes' ) );
		add_action( 'wp_head', array( $this, 'add_nojs_fallback' ) );
	}

	public function setup_filters() {
		add_filter( 'the_content', array( $this, 'add_image_placeholders' ), PHP_INT_MAX ); // run this later, so other content filters have run, including image_add_wh on WP.com
		add_filter( 'post_thumbnail_html', array( $this, 'add_image_placeholders' ), PHP_INT_MAX );
		add_filter( 'get_avatar', array( $this, 'add_image_placeholders' ), PHP_INT_MAX );
		add_filter( 'widget_text', array( $this, 'add_image_placeholders' ), PHP_INT_MAX );
		add_filter( 'get_image_tag', array( $this, 'add_image_placeholders' ), PHP_INT_MAX);
		add_filter( 'wp_get_attachment_image_attributes', array( __CLASS__, 'process_image_attributes' ), PHP_INT_MAX );
	}

	public function remove_filters() {
		remove_filter( 'the_content', array( $this, 'add_image_placeholders' ), PHP_INT_MAX );
		remove_filter( 'post_thumbnail_html', array( $this, 'add_image_placeholders' ), PHP_INT_MAX );
		remove_filter( 'get_avatar', array( $this, 'add_image_placeholders' ), PHP_INT_MAX );
		remove_filter( 'widget_text', array( $this, 'add_image_placeholders' ), PHP_INT_MAX );
		remove_filter( 'get_image_tag', array( $this, 'add_image_placeholders' ), PHP_INT_MAX);
		remove_filter( 'wp_get_attachment_image_attributes', array( __CLASS__, 'process_image_attributes' ), PHP_INT_MAX );
	}

	/**
	 * Ensure that our lazy image attributes are not filtered out of image tags.
	 *
	 * @param array $allowed_tags The allowed tags and their attributes.
	 * @return array
	 */
	public function allow_lazy_attributes( $allowed_tags ) {
		if ( ! isset( $allowed_tags['img'] ) ) {
			return $allowed_tags;
		}

		// But, if images are allowed, ensure that our attributes are allowed!
		$img_attributes = array_merge( $allowed_tags['img'], array(
			'data-lazy-src' => 1,
			'data-lazy-srcset' => 1,
			'data-lazy-sizes' => 1,
		) );

		$allowed_tags['img'] = $img_attributes;

		return $allowed_tags;
	}

	public function add_image_placeholders( $content ) {
		// Don't lazyload for feeds, previews
		if ( is_feed() || is_preview() ) {
			return $content;
		}

		// Don't lazy-load if the content has already been run through previously
		if ( false !== strpos( $content, 'data-lazy-src' ) ) {
			return $content;
		}

		// This is a pretty simple regex, but it works
		$content = preg_replace_callback( '#<(img)([^>]+?)(>(.*?)</\\1>|[\/]?>)#si', array( __CLASS__, 'process_image' ), $content );

		return $content;
	}

	/**
	 * Returns true when a given string of classes contains a class signifying lazy images
	 * should not process the image.
	 *
	 * @since 5.9.0
	 *
	 * @param string $classes A string of space-separated classes.
	 * @return bool
	 */
	public static function should_skip_image_with_blocked_class( $classes ) {
		$blocked_classes = array(
			'skip-lazy',
			'gazette-featured-content-thumbnail',
		);

		/**
		 * Allow plugins and themes to tell lazy images to skip an image with a given class.
		 *
		 * @module lazy-images
		 *
		 * @since 5.9.0
		 * @deprecated 8.7.0 Use jetpack_lazy_images_blocked_classes
		 *
		 * @param array An array of strings where each string is a class.
		 */
		$blocked_classes = apply_filters_deprecated( 'jetpack_lazy_images_blacklisted_classes', array( $blocked_classes ), 'Jetpack 8.7.0', 'jetpack_lazy_images_blocked_classes' );

		/**
		 * Allow plugins and themes to tell lazy images to skip an image with a given class.
		 *
		 * @module lazy-images
		 *
		 * @since 8.7.0
		 *
		 * @param array An array of strings where each string is a class.
		 */
		$blocked_classes = apply_filters( 'jetpack_lazy_images_blocked_classes', $blocked_classes );

		if ( ! is_array( $blocked_classes ) || empty( $blocked_classes ) ) {
			return false;
		}

		foreach ( $blocked_classes as $class ) {
			if ( false !== strpos( $classes, $class ) ) {
				return true;
			}
		}

		return false;
	}

	/**
	 * Processes images in content by acting as the preg_replace_callback
	 *
	 * @since 5.6.0
	 *
	 * @param array $matches
	 *
	 * @return string The image with updated lazy attributes
	 */
	static function process_image( $matches ) {
		$old_attributes_str       = $matches[2];
		$old_attributes_kses_hair = wp_kses_hair( $old_attributes_str, wp_allowed_protocols() );

		if ( empty( $old_attributes_kses_hair['src'] ) ) {
			return $matches[0];
		}

		$old_attributes = self::flatten_kses_hair_data( $old_attributes_kses_hair );

		// If we didn't add lazy attributes, just return the original image source.
		if ( ! empty( $old_attributes['class'] ) && false !== strpos( $old_attributes['class'], 'jetpack-lazy-image' ) ) {
			return $matches[0];
		}

		$new_attributes     = self::process_image_attributes( $old_attributes );
		$new_attributes_str = self::build_attributes_string( $new_attributes );

		return sprintf( '<img %1$s><noscript>%2$s</noscript>', $new_attributes_str, $matches[0] );
	}

	/**
	 * Given an array of image attributes, updates the `src`, `srcset`, and `sizes` attributes so
	 * that they load lazily.
	 *
	 * @since 5.7.0
	 *
	 * @param array $attributes
	 *
	 * @return array The updated image attributes array with lazy load attributes
	 */
	static function process_image_attributes( $attributes ) {
		if ( empty( $attributes['src'] ) ) {
			return $attributes;
		}

		if ( ! empty( $attributes['class'] ) && self::should_skip_image_with_blocked_class( $attributes['class'] ) ) {
			return $attributes;
		}

		if ( isset( $attributes['data-skip-lazy'] ) ) {
			return $attributes;
		}

		/**
		 * Allow plugins and themes to conditionally skip processing an image via its attributes.
		 *
		 * @module-lazy-images
		 *
		 * @deprecated 6.5.0 Use jetpack_lazy_images_skip_image_with_attributes instead.
		 *
		 * @since 5.9.0
		 *
		 * @param bool  Default to not skip processing the current image.
		 * @param array An array of attributes via wp_kses_hair() for the current image.
		 */
		if ( apply_filters( 'jetpack_lazy_images_skip_image_with_atttributes', false, $attributes ) ) {

			return $attributes;
		}

		/**
		 * Allow plugins and themes to conditionally skip processing an image via its attributes.
		 *
		 * @module-lazy-images
		 *
		 * @since 6.5.0 Filter name was updated from jetpack_lazy_images_skip_image_with_atttributes to correct typo.
		 * @since 5.9.0
		 *
		 * @param bool  Default to not skip processing the current image.
		 * @param array An array of attributes via wp_kses_hair() for the current image.
		 */
		if ( apply_filters( 'jetpack_lazy_images_skip_image_with_attributes', false, $attributes ) ) {

			return $attributes;
		}

		$old_attributes = $attributes;

		// Stash srcset and sizes in data attributes.
		foreach ( array( 'srcset', 'sizes' ) as $attribute ) {
			if ( isset( $old_attributes[ $attribute ] ) ) {
				$attributes[ "data-lazy-$attribute" ] = $old_attributes[ $attribute ];
				unset( $attributes[ $attribute ] );
			}
		}

		// We set this, adding the query arg so that it doesn't exactly equal the src attribute, so that photon JavaScript
		// will hold off on processing this image.
		$attributes['data-lazy-src'] = esc_url_raw( add_query_arg( 'is-pending-load', true, $attributes['src'] ) );

		$attributes['srcset'] = self::get_placeholder_image();
		$attributes['class']  = sprintf(
			'%s jetpack-lazy-image',
			empty( $old_attributes['class'] )
				? ''
				: $old_attributes['class']
		);

		/**
		 * Allow plugins and themes to override the attributes on the image before the content is updated.
		 *
		 * One potential use of this filter is for themes that set `height:auto` on the `img` tag.
		 * With this filter, the theme could get the width and height attributes from the
		 * $attributes array and then add a style tag that sets those values as well, which could
		 * minimize reflow as images load.
		 *
		 * @module lazy-images
		 *
		 * @since 5.6.0
		 *
		 * @param array An array containing the attributes for the image, where the key is the attribute name
		 *              and the value is the attribute value.
		 */
		return apply_filters( 'jetpack_lazy_images_new_attributes', $attributes );
	}

	/**
	 * Adds JavaScript to check if the current browser supports JavaScript as well as some styles to hide lazy
	 * images when the browser does not support JavaScript.
	 *
	 * @return void
	 */
	public function add_nojs_fallback() {
		?>
			<style type="text/css">
				/* If html does not have either class, do not show lazy loaded images. */
				html:not( .jetpack-lazy-images-js-enabled ):not( .js ) .jetpack-lazy-image {
					display: none;
				}
			</style>
			<script>
				document.documentElement.classList.add(
					'jetpack-lazy-images-js-enabled'
				);
			</script>
		<?php
	}

	/**
	 * Retrieves the placeholder image after running it through the lazyload_images_placeholder_image filter.
	 *
	 * @return string The placeholder image source.
	 */
	private static function get_placeholder_image() {
		/**
		 * Allows plugins and themes to modify the placeholder image.
		 *
		 * This filter is not prefixed with jetpack_ to provide a smoother migration
		 * process from the WordPress Lazy Load plugin.
		 *
		 * @module lazy-images
		 *
		 * @since 5.6.0
		 * @since 6.5.0 Default image is now a base64 encoded transparent gif.
		 *
		 * @param string The URL to the placeholder image
		 */
		return apply_filters(
			'lazyload_images_placeholder_image',
			'data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7'
		);
	}

	private static function flatten_kses_hair_data( $attributes ) {
		$flattened_attributes = array();
		foreach ( $attributes as $name => $attribute ) {
			$flattened_attributes[ $name ] = $attribute['value'];
		}
		return $flattened_attributes;
	}

	private static function build_attributes_string( $attributes ) {
		$string = array();
		foreach ( $attributes as $name => $value ) {
			if ( '' === $value ) {
				$string[] = sprintf( '%s', $name );
			} else {
				$string[] = sprintf( '%s="%s"', $name, esc_attr( $value ) );
			}
		}
		return implode( ' ', $string );
	}

	public function enqueue_assets() {
		wp_enqueue_script(
			'jetpack-lazy-images',
			Assets::get_file_url_for_environment(
				'_inc/build/lazy-images/js/lazy-images.min.js',
				'modules/lazy-images/js/lazy-images.js'
			),
			array(),
			JETPACK__VERSION,
			true
		);
	}
}


1		<?php
2
3		use Automattic\Jetpack\Assets;
4
5		class Jetpack_Lazy_Images {
6		private static $__instance = null;
7
8		/**
9		* Singleton implementation
10		*
11		* @return object
12		*/
13		public static function instance() {
14		if ( is_null( self::$__instance ) ) {
15		self::$__instance = new Jetpack_Lazy_Images();
16		}
17
18		return self::$__instance;
19		}
20
21		/**
22		* Registers actions
23		*/
24		private function __construct() {
25		if ( is_admin() ) {
26		return;
27		}
28
29		/**
30		* Whether the lazy-images module should load.
31		*
32		* This filter is not prefixed with jetpack_ to provide a smoother migration
33		* process from the WordPress Lazy Load plugin.
34		*
35		* @module lazy-images
36		*
37		* @since 5.6.0
38		*
39		* @param bool true Whether lazy image loading should occur.
40		*/
41		if ( ! apply_filters( 'lazyload_is_enabled', true ) ) {
42		return;
43		}
44
45		if ( Jetpack_AMP_Support::is_amp_request() ) {
46		return;
47		}
48
49		add_action( 'wp_head', array( $this, 'setup_filters' ), 9999 ); // we don't really want to modify anything in <head> since it's mostly all metadata
50		add_action( 'wp_enqueue_scripts', array( $this, 'enqueue_assets' ) );
51
52		// Do not lazy load avatar in admin bar
53		add_action( 'admin_bar_menu', array( $this, 'remove_filters' ), 0 );
54
55		add_filter( 'wp_kses_allowed_html', array( $this, 'allow_lazy_attributes' ) );
56		add_action( 'wp_head', array( $this, 'add_nojs_fallback' ) );
57		}
58
59	View Code Duplication	public function setup_filters() {
60		add_filter( 'the_content', array( $this, 'add_image_placeholders' ), PHP_INT_MAX ); // run this later, so other content filters have run, including image_add_wh on WP.com
61		add_filter( 'post_thumbnail_html', array( $this, 'add_image_placeholders' ), PHP_INT_MAX );
62		add_filter( 'get_avatar', array( $this, 'add_image_placeholders' ), PHP_INT_MAX );
63		add_filter( 'widget_text', array( $this, 'add_image_placeholders' ), PHP_INT_MAX );
64		add_filter( 'get_image_tag', array( $this, 'add_image_placeholders' ), PHP_INT_MAX);
65		add_filter( 'wp_get_attachment_image_attributes', array( __CLASS__, 'process_image_attributes' ), PHP_INT_MAX );
66		}
67
68	View Code Duplication	public function remove_filters() {
69		remove_filter( 'the_content', array( $this, 'add_image_placeholders' ), PHP_INT_MAX );
70		remove_filter( 'post_thumbnail_html', array( $this, 'add_image_placeholders' ), PHP_INT_MAX );
71		remove_filter( 'get_avatar', array( $this, 'add_image_placeholders' ), PHP_INT_MAX );
72		remove_filter( 'widget_text', array( $this, 'add_image_placeholders' ), PHP_INT_MAX );
73		remove_filter( 'get_image_tag', array( $this, 'add_image_placeholders' ), PHP_INT_MAX);
74		remove_filter( 'wp_get_attachment_image_attributes', array( __CLASS__, 'process_image_attributes' ), PHP_INT_MAX );
75		}
76
77		/**
78		* Ensure that our lazy image attributes are not filtered out of image tags.
79		*
80		* @param array $allowed_tags The allowed tags and their attributes.
81		* @return array
82		*/
83		public function allow_lazy_attributes( $allowed_tags ) {
84		if ( ! isset( $allowed_tags['img'] ) ) {
85		return $allowed_tags;
86		}
87
88		// But, if images are allowed, ensure that our attributes are allowed!
89		$img_attributes = array_merge( $allowed_tags['img'], array(
90		'data-lazy-src' => 1,
91		'data-lazy-srcset' => 1,
92		'data-lazy-sizes' => 1,
93		) );
94
95		$allowed_tags['img'] = $img_attributes;
96
97		return $allowed_tags;
98		}
99
100		public function add_image_placeholders( $content ) {
101		// Don't lazyload for feeds, previews
102		if ( is_feed() \|\| is_preview() ) {
103		return $content;
104		}
105
106		// Don't lazy-load if the content has already been run through previously
107		if ( false !== strpos( $content, 'data-lazy-src' ) ) {
108		return $content;
109		}
110
111		// This is a pretty simple regex, but it works
112		$content = preg_replace_callback( '#<(img)([^>]+?)(>(.*?)</\\1>\|[\/]?>)#si', array( __CLASS__, 'process_image' ), $content );
113
114		return $content;
115		}
116
117		/**
118		* Returns true when a given string of classes contains a class signifying lazy images
119		* should not process the image.
120		*
121		* @since 5.9.0
122		*
123		* @param string $classes A string of space-separated classes.
124		* @return bool
125		*/
126		public static function should_skip_image_with_blocked_class( $classes ) {
127		$blocked_classes = array(
128		'skip-lazy',
129		'gazette-featured-content-thumbnail',
130		);
131
132		/**
133		* Allow plugins and themes to tell lazy images to skip an image with a given class.
134		*
135		* @module lazy-images
136		*
137		* @since 5.9.0
138		* @deprecated 8.7.0 Use jetpack_lazy_images_blocked_classes
139		*
140		* @param array An array of strings where each string is a class.
141		*/
142		$blocked_classes = apply_filters_deprecated( 'jetpack_lazy_images_blacklisted_classes', array( $blocked_classes ), 'Jetpack 8.7.0', 'jetpack_lazy_images_blocked_classes' );
143
144		/**
145		* Allow plugins and themes to tell lazy images to skip an image with a given class.
146		*
147		* @module lazy-images
148		*
149		* @since 8.7.0
150		*
151		* @param array An array of strings where each string is a class.
152		*/
153		$blocked_classes = apply_filters( 'jetpack_lazy_images_blocked_classes', $blocked_classes );
154
155		if ( ! is_array( $blocked_classes ) \|\| empty( $blocked_classes ) ) {
156		return false;
157		}
158
159		foreach ( $blocked_classes as $class ) {
160		if ( false !== strpos( $classes, $class ) ) {
161		return true;
162		}
163		}
164
165		return false;
166		}
167
168		/**
169		* Processes images in content by acting as the preg_replace_callback
170		*
171		* @since 5.6.0
172		*
173		* @param array $matches
174		*
175		* @return string The image with updated lazy attributes
176		*/
177		static function process_image( $matches ) {
178		$old_attributes_str = $matches[2];
179		$old_attributes_kses_hair = wp_kses_hair( $old_attributes_str, wp_allowed_protocols() );
180
181		if ( empty( $old_attributes_kses_hair['src'] ) ) {
182		return $matches[0];
183		}
184
185		$old_attributes = self::flatten_kses_hair_data( $old_attributes_kses_hair );
186
187		// If we didn't add lazy attributes, just return the original image source.
188		if ( ! empty( $old_attributes['class'] ) && false !== strpos( $old_attributes['class'], 'jetpack-lazy-image' ) ) {
189		return $matches[0];
190		}
191
192		$new_attributes = self::process_image_attributes( $old_attributes );
193		$new_attributes_str = self::build_attributes_string( $new_attributes );
194
195		return sprintf( '<img %1$s><noscript>%2$s</noscript>', $new_attributes_str, $matches[0] );
196		}
197
198		/**
199		* Given an array of image attributes, updates the `src`, `srcset`, and `sizes` attributes so
200		* that they load lazily.
201		*
202		* @since 5.7.0
203		*
204		* @param array $attributes
205		*
206		* @return array The updated image attributes array with lazy load attributes
207		*/
208		static function process_image_attributes( $attributes ) {
209		if ( empty( $attributes['src'] ) ) {
210		return $attributes;
211		}
212
213		if ( ! empty( $attributes['class'] ) && self::should_skip_image_with_blocked_class( $attributes['class'] ) ) {
214		return $attributes;
215		}
216
217		if ( isset( $attributes['data-skip-lazy'] ) ) {
218		return $attributes;
219		}
220
221		/**
222		* Allow plugins and themes to conditionally skip processing an image via its attributes.
223		*
224		* @module-lazy-images
225		*
226		* @deprecated 6.5.0 Use jetpack_lazy_images_skip_image_with_attributes instead.
227		*
228		* @since 5.9.0
229		*
230		* @param bool Default to not skip processing the current image.
231		* @param array An array of attributes via wp_kses_hair() for the current image.
232		*/
233		if ( apply_filters( 'jetpack_lazy_images_skip_image_with_atttributes', false, $attributes ) ) {
		0 ignored issues – show Unused Code introduced 2020-05-15 22:01 UTC by Report Bug Copy Issue Report The call to `apply_filters()` has too many arguments starting with `$attributes`. This check compares calls to functions or methods with their respective definitions. If the call has more arguments than are defined, it raises an issue. If a function is defined several times with a different number of parameters, the check may pick up the wrong definition and report false positives. One codebase where this has been known to happen is Wordpress. In this case you can add the `@ignore` PhpDoc annotation to the duplicate definition and it will be ignored. Loading history...
234		return $attributes;
235		}
236
237		/**
238		* Allow plugins and themes to conditionally skip processing an image via its attributes.
239		*
240		* @module-lazy-images
241		*
242		* @since 6.5.0 Filter name was updated from jetpack_lazy_images_skip_image_with_atttributes to correct typo.
243		* @since 5.9.0
244		*
245		* @param bool Default to not skip processing the current image.
246		* @param array An array of attributes via wp_kses_hair() for the current image.
247		*/
248		if ( apply_filters( 'jetpack_lazy_images_skip_image_with_attributes', false, $attributes ) ) {
		0 ignored issues – show Unused Code introduced 2020-05-15 22:01 UTC by Report Bug Copy Issue Report The call to `apply_filters()` has too many arguments starting with `$attributes`. This check compares calls to functions or methods with their respective definitions. If the call has more arguments than are defined, it raises an issue. If a function is defined several times with a different number of parameters, the check may pick up the wrong definition and report false positives. One codebase where this has been known to happen is Wordpress. In this case you can add the `@ignore` PhpDoc annotation to the duplicate definition and it will be ignored. Loading history...
249		return $attributes;
250		}
251
252		$old_attributes = $attributes;
253
254		// Stash srcset and sizes in data attributes.
255		foreach ( array( 'srcset', 'sizes' ) as $attribute ) {
256		if ( isset( $old_attributes[ $attribute ] ) ) {
257		$attributes[ "data-lazy-$attribute" ] = $old_attributes[ $attribute ];
258		unset( $attributes[ $attribute ] );
259		}
260		}
261
262		// We set this, adding the query arg so that it doesn't exactly equal the src attribute, so that photon JavaScript
263		// will hold off on processing this image.
264		$attributes['data-lazy-src'] = esc_url_raw( add_query_arg( 'is-pending-load', true, $attributes['src'] ) );
265
266		$attributes['srcset'] = self::get_placeholder_image();
267		$attributes['class'] = sprintf(
268		'%s jetpack-lazy-image',
269		empty( $old_attributes['class'] )
270		? ''
271		: $old_attributes['class']
272		);
273
274		/**
275		* Allow plugins and themes to override the attributes on the image before the content is updated.
276		*
277		* One potential use of this filter is for themes that set `height:auto` on the `img` tag.
278		* With this filter, the theme could get the width and height attributes from the
279		* $attributes array and then add a style tag that sets those values as well, which could
280		* minimize reflow as images load.
281		*
282		* @module lazy-images
283		*
284		* @since 5.6.0
285		*
286		* @param array An array containing the attributes for the image, where the key is the attribute name
287		* and the value is the attribute value.
288		*/
289		return apply_filters( 'jetpack_lazy_images_new_attributes', $attributes );
290		}
291
292		/**
293		* Adds JavaScript to check if the current browser supports JavaScript as well as some styles to hide lazy
294		* images when the browser does not support JavaScript.
295		*
296		* @return void
297		*/
298		public function add_nojs_fallback() {
299		?>
300		<style type="text/css">
301		/* If html does not have either class, do not show lazy loaded images. */
302		html:not( .jetpack-lazy-images-js-enabled ):not( .js ) .jetpack-lazy-image {
303		display: none;
304		}
305		</style>
306		<script>
307		document.documentElement.classList.add(
308		'jetpack-lazy-images-js-enabled'
309		);
310		</script>
311		<?php
312		}
313
314		/**
315		* Retrieves the placeholder image after running it through the lazyload_images_placeholder_image filter.
316		*
317		* @return string The placeholder image source.
318		*/
319		private static function get_placeholder_image() {
320		/**
321		* Allows plugins and themes to modify the placeholder image.
322		*
323		* This filter is not prefixed with jetpack_ to provide a smoother migration
324		* process from the WordPress Lazy Load plugin.
325		*
326		* @module lazy-images
327		*
328		* @since 5.6.0
329		* @since 6.5.0 Default image is now a base64 encoded transparent gif.
330		*
331		* @param string The URL to the placeholder image
332		*/
333		return apply_filters(
334		'lazyload_images_placeholder_image',
335		'data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7'
336		);
337		}
338
339		private static function flatten_kses_hair_data( $attributes ) {
340		$flattened_attributes = array();
341		foreach ( $attributes as $name => $attribute ) {
342		$flattened_attributes[ $name ] = $attribute['value'];
343		}
344		return $flattened_attributes;
345		}
346
347		private static function build_attributes_string( $attributes ) {
348		$string = array();
349		foreach ( $attributes as $name => $value ) {
350		if ( '' === $value ) {
351		$string[] = sprintf( '%s', $name );
352		} else {
353		$string[] = sprintf( '%s="%s"', $name, esc_attr( $value ) );
354		}
355		}
356		return implode( ' ', $string );
357		}
358
359		public function enqueue_assets() {
360		wp_enqueue_script(
361		'jetpack-lazy-images',
362		Assets::get_file_url_for_environment(
363		'_inc/build/lazy-images/js/lazy-images.min.js',
364		'modules/lazy-images/js/lazy-images.js'
365		),
366		array(),
367		JETPACK__VERSION,
368		true
369		);
370		}
371		}
372

Automattic / jetpack

Push — update/readme-contributors ( d0ad08...a4dd26 )

Jetpack_Lazy_Images::allow_lazy_attributes() A

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