jetpack / functions.photon.php

functions.photon.php in Jetpack – WP Security, Backup, Speed, & Growth 2.7.5, at 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	$image_url = apply_filters( 'jetpack_photon_pre_image_url', $image_url, $args, $scheme );
16	$args = apply_filters( 'jetpack_photon_pre_args', $args, $image_url, $scheme );
17
18	if ( empty( $image_url ) )
19	return $image_url;
20
21	$image_url_parts = @parse_url( $image_url );
22
23	// Unable to parse
24	if ( ! is_array( $image_url_parts ) \|\| empty( $image_url_parts['host'] ) \|\| empty( $image_url_parts['path'] ) )
25	return $image_url;
26
27	if ( is_array( $args ) ){
28	// Convert values that are arrays into strings
29	foreach ( $args as $arg => $value ) {
30	if ( is_array( $value ) ) {
31	$args[$arg] = implode( ',', $value );
32	}
33	}
34
35	// Encode values
36	// See http://core.trac.wordpress.org/ticket/17923
37	$args = rawurlencode_deep( $args );
38	}
39
40	// You can't run a Photon URL through Photon again because query strings are stripped.
41	// So if the image is already a Photon URL, append the new arguments to the existing URL.
42	if ( in_array( $image_url_parts['host'], array( 'i0.wp.com', 'i1.wp.com', 'i2.wp.com' ) ) ) {
43	$photon_url = add_query_arg( $args, $image_url );
44
45	return jetpack_photon_url_scheme( $photon_url, $scheme );
46	}
47
48	// This setting is Photon Server dependent
49	if ( ! apply_filters( 'jetpack_photon_any_extension_for_domain', false, $image_url_parts['host'] ) ) {
50	// Photon doesn't support query strings so we ignore them and look only at the path.
51	// However some source images are served via PHP so check the no-query-string extension.
52	// For future proofing, this is a blacklist of common issues rather than a whitelist.
53	$extension = pathinfo( $image_url_parts['path'], PATHINFO_EXTENSION );
54	if ( empty( $extension ) \|\| in_array( $extension, array( 'php' ) ) )
55	return $image_url;
56	}
57
58	$image_host_path = $image_url_parts['host'] . $image_url_parts['path'];
59
60	// Figure out which CDN subdomain to use
61	srand( crc32( $image_host_path ) );
62	$subdomain = rand( 0, 2 );
63	srand();
64
65	$photon_url = "http://i{$subdomain}.wp.com/$image_host_path";
66
67	// This setting is Photon Server dependent
68	if ( isset( $image_url_parts['query'] ) && apply_filters( 'jetpack_photon_add_query_string_to_domain', false, $image_url_parts['host'] ) ) {
69	$photon_url .= '?q=' . rawurlencode( $image_url_parts['query'] );
70	}
71
72	if ( $args ) {
73	if ( is_array( $args ) ) {
74	$photon_url = add_query_arg( $args, $photon_url );
75	} else {
76	// You can pass a query string for complicated requests but where you still want CDN subdomain help, etc.
77	$photon_url .= '?' . $args;
78	}
79	}
80
81	return jetpack_photon_url_scheme( $photon_url, $scheme );
82	}
83	add_filter( 'jetpack_photon_url', 'jetpack_photon_url', 10, 3 );
84
85	/**
86	* WordPress.com
87	*
88	* If a cropped WP.com-hosted image is the source image, have Photon replicate the crop.
89	*/
90	add_filter( 'jetpack_photon_pre_args', 'jetpack_photon_parse_wpcom_query_args', 10, 2 );
91
92	function jetpack_photon_parse_wpcom_query_args( $args, $image_url ) {
93	$parsed_url = @parse_url( $image_url );
94
95	if ( ! $parsed_url )
96	return $args;
97
98	$image_url_parts = wp_parse_args( $parsed_url, array(
99	'host' => '',
100	'query' => ''
101	) );
102
103	if ( '.files.wordpress.com' != substr( $image_url_parts['host'], -20 ) )
104	return $args;
105
106	if ( empty( $image_url_parts['query'] ) )
107	return $args;
108
109	$wpcom_args = wp_parse_args( $image_url_parts['query'] );
110
111	if ( empty( $wpcom_args['w'] ) \|\| empty( $wpcom_args['h'] ) )
112	return $args;
113
114	// Keep the crop by using "resize"
115	if ( ! empty( $wpcom_args['crop'] ) ) {
116	if ( is_array( $args ) ) {
117	$args = array_merge( array( 'resize' => array( $wpcom_args['w'], $wpcom_args['h'] ) ), $args );
118	} else {
119	$args = 'resize=' . rawurlencode( absint( $wpcom_args['w'] ) . ',' . absint( $wpcom_args['h'] ) ) . '&' . $args;
120	}
121	} else {
122	if ( is_array( $args ) ) {
123	$args = array_merge( array( 'fit' => array( $wpcom_args['w'], $wpcom_args['h'] ) ), $args );
124	} else {
125	$args = 'fit=' . rawurlencode( absint( $wpcom_args['w'] ) . ',' . absint( $wpcom_args['h'] ) ) . '&' . $args;
126	}
127	}
128
129	return $args;
130	}
131
132
133	/**
134	* Facebook
135	*/
136	add_filter( 'jetpack_photon_add_query_string_to_domain', 'jetpack_photon_allow_facebook_graph_domain', 10, 2 );
137	add_filter( 'jetpack_photon_any_extension_for_domain', 'jetpack_photon_allow_facebook_graph_domain', 10, 2 );
138
139	function jetpack_photon_url_scheme( $url, $scheme ) {
140	if ( ! in_array( $scheme, array( 'http', 'https', 'network_path' ) ) ) {
141	$scheme = is_ssl() ? 'https' : 'http';
142	}
143
144	if ( 'network_path' == $scheme ) {
145	$scheme_slashes = '//';
146	} else {
147	$scheme_slashes = "$scheme://";
148	}
149
150	return preg_replace( '#^[a-z:]+//#i', $scheme_slashes, $url );
151	}
152
153	function jetpack_photon_allow_facebook_graph_domain( $allow = false, $domain ) {
154	switch ( $domain ) {
155	case 'graph.facebook.com' :
156	return true;
157	}
158
159	return $allow;
160	}
161