functions.photon.php — Jetpack – WP Security, Backup, Speed, & Growth 7.2.1

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functions.photon.php

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1	<?php
2
3	/**
4	* Generates a Photon URL.
5	*
6	* @see http://developer.wordpress.com/docs/photon/
7	*
8	* @param string $image_url URL to the publicly accessible image you want to manipulate
9	* @param array\|string $args An array of arguments, i.e. array( 'w' => '300', 'resize' => array( 123, 456 ) ), or in string form (w=123&h=456)
10	* @return string The raw final URL. You should run this through esc_url() before displaying it.
11	*/
12	function jetpack_photon_url( $image_url, $args = array(), $scheme = null ) {
13	$image_url = trim( $image_url );
14
15	if ( ! defined( 'IS_WPCOM' ) \|\| ! IS_WPCOM ) {
16	/**
17	* Disables Photon URL processing for local development
18	*
19	* @module photon
20	*
21	* @since 4.1.0
22	*
23	* @param bool false Result of Jetpack::is_development_mode.
24	*/
25	if ( true === apply_filters( 'jetpack_photon_development_mode', Jetpack::is_development_mode() ) ) {
26	return $image_url;
27	}
28	}
29
30	/**
31	* Allow specific image URls to avoid going through Photon.
32	*
33	* @module photon
34	*
35	* @since 3.2.0
36	*
37	* @param bool false Should the image be returned as is, without going through Photon. Default to false.
38	* @param string $image_url Image URL.
39	* @param array\|string $args Array of Photon arguments.
40	* @param string\|null $scheme Image scheme. Default to null.
41	*/
42	if ( false !== apply_filters( 'jetpack_photon_skip_for_url', false, $image_url, $args, $scheme ) ) {
43	return $image_url;
44	}
45
46	/**
47	* Filter the original image URL before it goes through Photon.
48	*
49	* @module photon
50	*
51	* @since 1.9.0
52	*
53	* @param string $image_url Image URL.
54	* @param array\|string $args Array of Photon arguments.
55	* @param string\|null $scheme Image scheme. Default to null.
56	*/
57	$image_url = apply_filters( 'jetpack_photon_pre_image_url', $image_url, $args, $scheme );
58	/**
59	* Filter the original Photon image parameters before Photon is applied to an image.
60	*
61	* @module photon
62	*
63	* @since 1.9.0
64	*
65	* @param array\|string $args Array of Photon arguments.
66	* @param string $image_url Image URL.
67	* @param string\|null $scheme Image scheme. Default to null.
68	*/
69	$args = apply_filters( 'jetpack_photon_pre_args', $args, $image_url, $scheme );
70
71	if ( empty( $image_url ) ) {
72	return $image_url;
73	}
74
75	$image_url_parts = @jetpack_photon_parse_url( $image_url );
76
77	// Unable to parse
78	if ( ! is_array( $image_url_parts ) \|\| empty( $image_url_parts['host'] ) \|\| empty( $image_url_parts['path'] ) ) {
79	return $image_url;
80	}
81
82	if ( is_array( $args ) ){
83	// Convert values that are arrays into strings
84	foreach ( $args as $arg => $value ) {
85	if ( is_array( $value ) ) {
86	$args[$arg] = implode( ',', $value );
87	}
88	}
89
90	// Encode values
91	// See http://core.trac.wordpress.org/ticket/17923
92	$args = rawurlencode_deep( $args );
93	}
94
95	// Don't photon-ize WPCOM hosted images -- we can serve them up from wpcom directly.
96	$is_wpcom_image = false;
97	if ( wp_endswith( strtolower( $image_url_parts['host'] ), '.files.wordpress.com' ) ) {
98	$is_wpcom_image = true;
99	if ( isset( $args['ssl'] ) ) {
100	// Do not send the ssl argument to prevent caching issues
101	unset( $args['ssl'] );
102	}
103	}
104
105	/** This filter is documented below. */
106	$custom_photon_url = apply_filters( 'jetpack_photon_domain', '', $image_url );
107	$custom_photon_url = esc_url( $custom_photon_url );
108
109	// You can't run a Photon URL through Photon again because query strings are stripped.
110	// So if the image is already a Photon URL, append the new arguments to the existing URL.
111	// Alternately, if it's a *.files.wordpress.com url, then keep the domain as is.
112	if (
113	in_array( $image_url_parts['host'], array( 'i0.wp.com', 'i1.wp.com', 'i2.wp.com' ) )
114	\|\| $image_url_parts['host'] === jetpack_photon_parse_url( $custom_photon_url, PHP_URL_HOST )
115	\|\| $is_wpcom_image
116	) {
117	$photon_url = add_query_arg( $args, $image_url );
118	return jetpack_photon_url_scheme( $photon_url, $scheme );
119	}
120
121	/**
122	* Allow Photon to use query strings as well.
123	* By default, Photon doesn't support query strings so we ignore them and look only at the path.
124	* This setting is Photon Server dependent.
125	*
126	* @module photon
127	*
128	* @since 1.9.0
129	*
130	* @param bool false Should images using query strings go through Photon. Default is false.
131	* @param string $image_url_parts['host'] Image URL's host.
132	*/
133	if ( ! apply_filters( 'jetpack_photon_any_extension_for_domain', false, $image_url_parts['host'] ) ) {
134	// Photon doesn't support query strings so we ignore them and look only at the path.
135	// However some source images are served via PHP so check the no-query-string extension.
136	// For future proofing, this is a blacklist of common issues rather than a whitelist.
137	$extension = pathinfo( $image_url_parts['path'], PATHINFO_EXTENSION );
138	if ( empty( $extension ) \|\| in_array( $extension, array( 'php', 'ashx' ) ) ) {
139	return $image_url;
140	}
141	}
142
143	$image_host_path = $image_url_parts['host'] . $image_url_parts['path'];
144
145	// Figure out which CDN subdomain to use
146	srand( crc32( $image_host_path ) );
147	$subdomain = rand( 0, 2 );
148	srand();
149
150	/**
151	* Filters the domain used by the Photon module.
152	*
153	* @module photon
154	*
155	* @since 3.4.2
156	*
157	* @param string https://i{$subdomain}.wp.com Domain used by Photon. $subdomain is a random number between 0 and 2.
158	* @param string $image_url URL of the image to be photonized.
159	*/
160	$photon_domain = apply_filters( 'jetpack_photon_domain', "https://i{$subdomain}.wp.com", $image_url );
161	$photon_domain = trailingslashit( esc_url( $photon_domain ) );
162	$photon_url = $photon_domain . $image_host_path;
163
164	/**
165	* Add query strings to Photon URL.
166	* By default, Photon doesn't support query strings so we ignore them.
167	* This setting is Photon Server dependent.
168	*
169	* @module photon
170	*
171	* @since 1.9.0
172	*
173	* @param bool false Should query strings be added to the image URL. Default is false.
174	* @param string $image_url_parts['host'] Image URL's host.
175	*/
176	if ( isset( $image_url_parts['query'] ) && apply_filters( 'jetpack_photon_add_query_string_to_domain', false, $image_url_parts['host'] ) ) {
177	$photon_url .= '?q=' . rawurlencode( $image_url_parts['query'] );
178	}
179
180	if ( $args ) {
181	if ( is_array( $args ) ) {
182	$photon_url = add_query_arg( $args, $photon_url );
183	} else {
184	// You can pass a query string for complicated requests but where you still want CDN subdomain help, etc.
185	$photon_url .= '?' . $args;
186	}
187	}
188
189	if ( isset( $image_url_parts['scheme'] ) && 'https' == $image_url_parts['scheme'] ) {
190	$photon_url = add_query_arg( array( 'ssl' => 1 ), $photon_url );
191	}
192
193	return jetpack_photon_url_scheme( $photon_url, $scheme );
194	}
195	add_filter( 'jetpack_photon_url', 'jetpack_photon_url', 10, 3 );
196
197	/**
198	* WordPress.com
199	*
200	* If a cropped WP.com-hosted image is the source image, have Photon replicate the crop.
201	*/
202	add_filter( 'jetpack_photon_pre_args', 'jetpack_photon_parse_wpcom_query_args', 10, 2 );
203
204	function jetpack_photon_parse_wpcom_query_args( $args, $image_url ) {
205	$parsed_url = @parse_url( $image_url );
206
207	if ( ! $parsed_url )
208	return $args;
209
210	$image_url_parts = wp_parse_args( $parsed_url, array(
211	'host' => '',
212	'query' => ''
213	) );
214
215	if ( '.files.wordpress.com' != substr( $image_url_parts['host'], -20 ) )
216	return $args;
217
218	if ( empty( $image_url_parts['query'] ) )
219	return $args;
220
221	$wpcom_args = wp_parse_args( $image_url_parts['query'] );
222
223	if ( empty( $wpcom_args['w'] ) \|\| empty( $wpcom_args['h'] ) )
224	return $args;
225
226	// Keep the crop by using "resize"
227	if ( ! empty( $wpcom_args['crop'] ) ) {
228	if ( is_array( $args ) ) {
229	$args = array_merge( array( 'resize' => array( $wpcom_args['w'], $wpcom_args['h'] ) ), $args );
230	} else {
231	$args = 'resize=' . rawurlencode( absint( $wpcom_args['w'] ) . ',' . absint( $wpcom_args['h'] ) ) . '&' . $args;
232	}
233	} else {
234	if ( is_array( $args ) ) {
235	$args = array_merge( array( 'fit' => array( $wpcom_args['w'], $wpcom_args['h'] ) ), $args );
236	} else {
237	$args = 'fit=' . rawurlencode( absint( $wpcom_args['w'] ) . ',' . absint( $wpcom_args['h'] ) ) . '&' . $args;
238	}
239	}
240
241	return $args;
242	}
243
244	function jetpack_photon_url_scheme( $url, $scheme ) {
245	if ( ! in_array( $scheme, array( 'http', 'https', 'network_path' ) ) ) {
246	if ( preg_match( '#^(https?:)?//#', $url ) ) {
247	return $url;
248	}
249
250	$scheme = 'http';
251	}
252
253	if ( 'network_path' == $scheme ) {
254	$scheme_slashes = '//';
255	} else {
256	$scheme_slashes = "$scheme://";
257	}
258
259	return preg_replace( '#^([a-z:]+)?//#i', $scheme_slashes, $url );
260	}
261
262	/**
263	* A wrapper for PHP's parse_url, prepending assumed scheme for network path
264	* URLs. PHP versions 5.4.6 and earlier do not correctly parse without scheme.
265	*
266	* @see http://php.net/manual/en/function.parse-url.php#refsect1-function.parse-url-changelog
267	*
268	* @param string $url The URL to parse
269	* @param integer $component Retrieve specific URL component
270	* @return mixed Result of parse_url
271	*/
272	function jetpack_photon_parse_url( $url, $component = -1 ) {
273	if ( 0 === strpos( $url, '//' ) ) {
274	$url = ( is_ssl() ? 'https:' : 'http:' ) . $url;
275	}
276
277	return parse_url( $url, $component );
278	}
279
280	add_filter( 'jetpack_photon_skip_for_url', 'jetpack_photon_banned_domains', 9, 2 );
281	function jetpack_photon_banned_domains( $skip, $image_url ) {
282	$banned_host_patterns = array(
283	'/^chart\.googleapis\.com$/',
284	'/^chart\.apis\.google\.com$/',
285	'/^graph\.facebook\.com$/',
286	'/\.fbcdn\.net$/',
287	'/\.paypalobjects\.com$/',
288	'/\.dropbox\.com$/',
289	'/\.cdninstagram\.com$/',
290	);
291
292	$host = jetpack_photon_parse_url( $image_url, PHP_URL_HOST );
293
294	foreach ( $banned_host_patterns as $banned_host_pattern ) {
295	if ( 1 === preg_match( $banned_host_pattern, $host ) ) {
296	return true;
297	}
298	}
299
300	return $skip;
301	}
302
303
304	/**
305	* Jetpack Photon - Support Text Widgets.
306	*
307	* @access public
308	* @param string $content Content from text widget.
309	* @return string
310	*/
311	function jetpack_photon_support_text_widgets( $content ) {
312	if ( class_exists( 'Jetpack_Photon' ) && Jetpack::is_module_active( 'photon' ) ) {
313	return Jetpack_Photon::filter_the_content( $content );
314	}
315	return $content;
316	}
317	add_filter( 'widget_text', 'jetpack_photon_support_text_widgets' );
318