jetpack / functions.photon.php

functions.photon.php in Jetpack – WP Security, Backup, Speed, & Growth 3.2.5, 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	if ( false !== apply_filters( 'jetpack_photon_skip_for_url', false, $image_url, $args, $scheme ) ) {
16	return $image_url;
17	}
18
19	$image_url = apply_filters( 'jetpack_photon_pre_image_url', $image_url, $args, $scheme );
20	$args = apply_filters( 'jetpack_photon_pre_args', $args, $image_url, $scheme );
21
22	if ( empty( $image_url ) )
23	return $image_url;
24
25	$image_url_parts = @parse_url( $image_url );
26
27	// Unable to parse
28	if ( ! is_array( $image_url_parts ) \|\| empty( $image_url_parts['host'] ) \|\| empty( $image_url_parts['path'] ) )
29	return $image_url;
30
31	if ( is_array( $args ) ){
32	// Convert values that are arrays into strings
33	foreach ( $args as $arg => $value ) {
34	if ( is_array( $value ) ) {
35	$args[$arg] = implode( ',', $value );
36	}
37	}
38
39	// Encode values
40	// See http://core.trac.wordpress.org/ticket/17923
41	$args = rawurlencode_deep( $args );
42	}
43
44	// You can't run a Photon URL through Photon again because query strings are stripped.
45	// So if the image is already a Photon URL, append the new arguments to the existing URL.
46	if ( in_array( $image_url_parts['host'], array( 'i0.wp.com', 'i1.wp.com', 'i2.wp.com' ) ) ) {
47	$photon_url = add_query_arg( $args, $image_url );
48
49	return jetpack_photon_url_scheme( $photon_url, $scheme );
50	}
51
52	// This setting is Photon Server dependent
53	if ( ! apply_filters( 'jetpack_photon_any_extension_for_domain', false, $image_url_parts['host'] ) ) {
54	// Photon doesn't support query strings so we ignore them and look only at the path.
55	// However some source images are served via PHP so check the no-query-string extension.
56	// For future proofing, this is a blacklist of common issues rather than a whitelist.
57	$extension = pathinfo( $image_url_parts['path'], PATHINFO_EXTENSION );
58	if ( empty( $extension ) \|\| in_array( $extension, array( 'php' ) ) )
59	return $image_url;
60	}
61
62	$image_host_path = $image_url_parts['host'] . $image_url_parts['path'];
63
64	// Figure out which CDN subdomain to use
65	srand( crc32( $image_host_path ) );
66	$subdomain = rand( 0, 2 );
67	srand();
68
69	$photon_url = "http://i{$subdomain}.wp.com/$image_host_path";
70
71	// This setting is Photon Server dependent
72	if ( isset( $image_url_parts['query'] ) && apply_filters( 'jetpack_photon_add_query_string_to_domain', false, $image_url_parts['host'] ) ) {
73	$photon_url .= '?q=' . rawurlencode( $image_url_parts['query'] );
74	}
75
76	if ( $args ) {
77	if ( is_array( $args ) ) {
78	$photon_url = add_query_arg( $args, $photon_url );
79	} else {
80	// You can pass a query string for complicated requests but where you still want CDN subdomain help, etc.
81	$photon_url .= '?' . $args;
82	}
83	}
84
85	return jetpack_photon_url_scheme( $photon_url, $scheme );
86	}
87	add_filter( 'jetpack_photon_url', 'jetpack_photon_url', 10, 3 );
88
89	/**
90	* WordPress.com
91	*
92	* If a cropped WP.com-hosted image is the source image, have Photon replicate the crop.
93	*/
94	add_filter( 'jetpack_photon_pre_args', 'jetpack_photon_parse_wpcom_query_args', 10, 2 );
95
96	function jetpack_photon_parse_wpcom_query_args( $args, $image_url ) {
97	$parsed_url = @parse_url( $image_url );
98
99	if ( ! $parsed_url )
100	return $args;
101
102	$image_url_parts = wp_parse_args( $parsed_url, array(
103	'host' => '',
104	'query' => ''
105	) );
106
107	if ( '.files.wordpress.com' != substr( $image_url_parts['host'], -20 ) )
108	return $args;
109
110	if ( empty( $image_url_parts['query'] ) )
111	return $args;
112
113	$wpcom_args = wp_parse_args( $image_url_parts['query'] );
114
115	if ( empty( $wpcom_args['w'] ) \|\| empty( $wpcom_args['h'] ) )
116	return $args;
117
118	// Keep the crop by using "resize"
119	if ( ! empty( $wpcom_args['crop'] ) ) {
120	if ( is_array( $args ) ) {
121	$args = array_merge( array( 'resize' => array( $wpcom_args['w'], $wpcom_args['h'] ) ), $args );
122	} else {
123	$args = 'resize=' . rawurlencode( absint( $wpcom_args['w'] ) . ',' . absint( $wpcom_args['h'] ) ) . '&' . $args;
124	}
125	} else {
126	if ( is_array( $args ) ) {
127	$args = array_merge( array( 'fit' => array( $wpcom_args['w'], $wpcom_args['h'] ) ), $args );
128	} else {
129	$args = 'fit=' . rawurlencode( absint( $wpcom_args['w'] ) . ',' . absint( $wpcom_args['h'] ) ) . '&' . $args;
130	}
131	}
132
133	return $args;
134	}
135
136
137	/**
138	* Facebook
139	*/
140	add_filter( 'jetpack_photon_add_query_string_to_domain', 'jetpack_photon_allow_facebook_graph_domain', 10, 2 );
141	add_filter( 'jetpack_photon_any_extension_for_domain', 'jetpack_photon_allow_facebook_graph_domain', 10, 2 );
142
143	function jetpack_photon_url_scheme( $url, $scheme ) {
144	if ( ! in_array( $scheme, array( 'http', 'https', 'network_path' ) ) ) {
145	$scheme = is_ssl() ? 'https' : 'http';
146	}
147
148	if ( 'network_path' == $scheme ) {
149	$scheme_slashes = '//';
150	} else {
151	$scheme_slashes = "$scheme://";
152	}
153
154	return preg_replace( '#^[a-z:]+//#i', $scheme_slashes, $url );
155	}
156
157	function jetpack_photon_allow_facebook_graph_domain( $allow = false, $domain ) {
158	switch ( $domain ) {
159	case 'graph.facebook.com' :
160	return true;
161	}
162
163	return $allow;
164	}
165