powered-cache / includes / classes / CDN.php

CDN.php in Powered Cache – Caching and Optimization for WordPress – Easily Improve PageSpeed & Web Vitals Score 2.0, at includes/classes/CDN.php

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1	<?php
2	/**
3	* CDN functionalities
4	*
5	* @package PoweredCache
6	*/
7
8	namespace PoweredCache;
9
10	use \DOMDocument as DOMDocument;
11	use function PoweredCache\Utils\cdn_addresses;
12
13	if ( ! defined( 'ABSPATH' ) ) {
14	exit;
15	}
16
17	/**
18	* Class CDN
19	*/
20	class CDN {
21
22	/**
23	* Return an instance of the current class
24	*
25	* @return CDN
26	* @since 1.0
27	*/
28	public static function factory() {
29	static $instance = false;
30
31	if ( ! $instance ) {
32	$instance = new self();
33	$instance->setup();
34	}
35
36	return $instance;
37	}
38
39	/**
40	* Setup hooks
41	*
42	* @since 1.0
43	*/
44	public function setup() {
45	$settings = \PoweredCache\Utils\get_settings();
46
47	if ( ! $settings['enable_cdn'] ) {
48	return;
49	}
50
51	add_filter( 'wp_get_attachment_url', array( $this, 'cdn_url' ), 9999 );
52	add_filter( 'stylesheet_uri', array( $this, 'cdn_url' ), 9999 );
53	add_filter( 'smilies_src', array( $this, 'cdn_url' ), 9999 );
54	add_filter( 'bp_core_fetch_avatar_url', array( $this, 'cdn_url' ), 9999 );
55	add_filter( 'style_loader_src', array( $this, 'cdn_url' ), 9999 );
56	add_filter( 'script_loader_src', array( $this, 'cdn_url' ), 9999 );
57	add_filter( 'powered_cache_cdn_assets', array( $this, 'cdn_url' ), 9999 );
58	add_filter( 'wp_calculate_image_srcset', array( $this, 'srcset_url' ), 9999 );
59	add_filter( 'wp_get_attachment_image_src', array( $this, 'attachment_image_src' ), 9999 );
60	add_filter( 'the_content', array( $this, 'cdn_images' ), 9999 );
61	add_filter( 'post_thumbnail_html', array( $this, 'cdn_images' ), 9999 );
62	add_filter( 'get_avatar', array( $this, 'cdn_images' ), 9999 );
63	add_filter( 'bp_core_fetch_avatar', array( $this, 'cdn_images' ), 9999 );
64	add_filter( 'widget_text', array( $this, 'cdn_images' ), 9999 );
65	add_filter( 'media_image', array( $this, 'cdn_images' ), 9999 );
66	add_filter( 'powered_cache_page_caching_buffer', array( $this, 'cdn_images' ), 9999 );
67	add_filter( 'powered_cache_fo_optimized_url', array( $this, 'cdn_optimizer_url' ), 9999, 2 );
68
69	/**
70	* Fires after setup CDN hooks.
71	*
72	* @hook powered_cache_cdn_setup
73	*
74	* @since 1.0
75	*/
76	do_action( 'powered_cache_cdn_setup' );
77	}
78
79	/**
80	* CDN hostname replacement for optimized URLs
81	*
82	* @param string $optimized_url Optimized assets URL
83	* @param string $path rel path of the files
84	*
85	* @return mixed
86	*/
87	public function cdn_optimizer_url( $optimized_url, $path ) {
88	if ( '-' === $path[0] ) {
89	$path = @gzuncompress( base64_decode( substr( $path, 1 ) ) ); // phpcs:ignore WordPress.PHP.NoSilencedErrors.Discouraged,WordPress.PHP.DiscouragedPHPFunctions.obfuscation_base64_decode
90	}
91
92	$zone = 'all';
93	if ( $path && false !== strpos( $path, '.css' ) ) {
94	$zone = 'css';
95	} elseif ( $path && false !== strpos( $path, '.js' ) ) {
96	$zone = 'js';
97	}
98
99	$cdn_url = self::get_best_possible_cdn_host( $zone );
100
101	$optimized_url = str_replace( home_url(), $cdn_url, $optimized_url );
102
103	return $optimized_url;
104	}
105
106	/**
107	* Replace CDN url for srcset
108	*
109	* @param array $sources Source files
110	*
111	* @return mixed
112	* @since 1.2
113	*/
114	public function srcset_url( $sources ) {
115	foreach ( $sources as $key => $source ) {
116	$sources[ $key ]['url'] = $this->cdn_url( $source['url'] );
117	}
118
119	return $sources;
120	}
121
122	/**
123	* Replace given url with the CDN host
124	*
125	* @param string $url URL
126	*
127	* @return string
128	*/
129	public function cdn_url( $url ) {
130	if ( is_admin() \|\| is_preview() ) {
131	return $url;
132	}
133
134	return $this->maybe_cdn_replace( $url );
135	}
136
137
138	/**
139	* Replace URL for wp_get_attachment_image_src function
140	*
141	* @param array\|false $image Either array with src, width & height, icon src, or false
142	*
143	* @return array $image
144	* @since 1.2.4
145	*/
146	public function attachment_image_src( $image ) {
147	if ( is_admin() \|\| is_preview() ) {
148	return $image;
149	}
150
151	if ( ! (bool) $image ) {
152	return $image;
153	}
154
155	$cdn_url = self::get_best_possible_cdn_host( 'image' );
156	// no host found
157	if ( false === $cdn_url ) {
158	return $image;
159	}
160
161	$image[0] = str_replace( home_url(), $cdn_url, $image[0] );
162
163	return $image;
164	}
165
166	/**
167	* Replace images with CDN host
168	*
169	* @param string $content Content
170	*
171	* @return mixed
172	*/
173	public function cdn_images( $content ) {
174	if ( is_admin() \|\| is_preview() \|\| empty( $content ) ) {
175	return $content;
176	}
177
178	if ( ! class_exists( 'DOMDocument' ) ) {
179	return $content;
180	}
181
182	$document = new DOMDocument();
183	@$document->loadHTML( $content ); // phpcs:ignore WordPress.PHP.NoSilencedErrors.Discouraged
184	$images = $document->getElementsByTagName( 'img' );
185
186	$img_url = array();
187	foreach ( $images as $img ) {
188	if ( $img->hasAttribute( 'src' ) ) {
189	$img_url[] = $img->getAttribute( 'src' );
190	}
191
192	if ( $img->hasAttribute( 'srcset' ) ) {
193	$imgset = explode( ',', $img->getAttribute( 'srcset' ) );
194	foreach ( $imgset as $src_item ) {
195	$imgsrc = explode( ' ', trim( $src_item ) );
196	// first item is url, second width
197	$img_url[] = $imgsrc[0];
198	}
199	}
200	}
201
202	$img_url = array_unique( $img_url );
203	$cdn_url = array();
204
205	foreach ( $img_url as $replace_url ) {
206	$cdn_url[] = $this->maybe_cdn_replace( $replace_url );
207	}
208
209	return str_replace( $img_url, $cdn_url, $content );
210	}
211
212
213	/**
214	* this method decide to url replacement.
215	* rejected files & external resources will be ignored
216	*
217	* @param string $url URL
218	*
219	* @return string cdn url
220	* @since 1.0
221	*/
222	public static function maybe_cdn_replace( $url ) {
223	$settings = \PoweredCache\Utils\get_settings();
224
225	// rejected file
226	if ( ! empty( $settings['cdn_rejected_files'] ) ) {
227	$cdn_rejected_files = preg_split( '#(\r\n\|\r\|\n)#', $settings['cdn_rejected_files'], - 1, PREG_SPLIT_NO_EMPTY );
228	$cdn_rejected_files = implode( '\|', $cdn_rejected_files );
229
230	if ( preg_match( '#(' . $cdn_rejected_files . ')#', $url ) ) {
231	return $url;
232	}
233	}
234
235	// external resource
236	if ( false === strpos( $url, home_url() ) ) {
237	return $url;
238	}
239
240	// don't replace for base64 encoded images
241	if ( false !== strpos( $url, 'data:image' ) ) {
242	return $url;
243	}
244
245	$url_path = wp_parse_url( $url, PHP_URL_PATH );
246	$ext = explode( '.', $url_path );
247	$ext = strtolower( end( $ext ) );
248
249	$zone = 'all';
250
251	/**
252	* Filters supported image extensions.
253	*
254	* @hook powered_cache_cdn_image_extensions
255	*
256	* @param {array} $image_extensions Supported image extensions.
257	*
258	* @return {array} New value.
259	* @since 1.0
260	*/
261	$image_extensions = apply_filters( 'powered_cache_cdn_image_extensions', array( 'jpg', 'jpeg', 'gif', 'png', 'bmp', 'ico', 'webp' ) );
262
263	if ( in_array( $ext, $image_extensions, true ) ) {
264	$zone = 'image';
265	} elseif ( 'css' === $ext ) {
266	$zone = 'css';
267	} elseif ( 'js' === $ext ) {
268	$zone = 'js';
269	}
270
271	$cdn_url = self::get_best_possible_cdn_host( $zone );
272
273	// no host found
274	if ( false === $cdn_url ) {
275	return $url;
276	}
277
278	return str_replace( home_url(), $cdn_url, $url );
279	}
280
281	/**
282	* try to catch best cdn address to given zone
283	*
284	* @param string $zone keys of Powered_Cache_Admin_Helper::cdn_zones
285	*
286	* @return mixed string \| false
287	*/
288	public static function get_best_possible_cdn_host( $zone = 'all' ) {
289	global $powered_cache_cdn_addresses;
290
291	if ( ! isset( $powered_cache_cdn_addresses ) ) {
292	$powered_cache_cdn_addresses = cdn_addresses();
293	}
294
295	if ( isset( $powered_cache_cdn_addresses[ $zone ] ) && is_array( $powered_cache_cdn_addresses[ $zone ] ) ) {
296	// if we have multiple host for the same resource get randomly
297	$random_key = array_rand( $powered_cache_cdn_addresses[ $zone ] );
298
299	return $powered_cache_cdn_addresses[ $zone ][ $random_key ];
300	}
301
302	// fallback to primary host
303	if ( isset( $powered_cache_cdn_addresses['all'] ) && is_array( $powered_cache_cdn_addresses['all'] ) ) {
304	$random_key = array_rand( $powered_cache_cdn_addresses['all'] );
305
306	return $powered_cache_cdn_addresses['all'][ $random_key ];
307	}
308
309	return false;
310	}
311
312	}
313
314