Created
July 14, 2014 18:17
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<?php | |
/** | |
* Generates a Photon URL. | |
* | |
* @see http://developer.wordpress.com/docs/photon/ | |
* | |
* @param string $image_url URL to the publicly accessible image you want to manipulate | |
* @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) | |
* @return string The raw final URL. You should run this through esc_url() before displaying it. | |
*/ | |
function jetpack_photon_url( $image_url, $args = array(), $scheme = null ) { | |
$image_url = trim( $image_url ); | |
$image_url = apply_filters( 'jetpack_photon_pre_image_url', $image_url, $args, $scheme ); | |
$args = apply_filters( 'jetpack_photon_pre_args', $args, $image_url, $scheme ); | |
if ( empty( $image_url ) ) | |
return $image_url; | |
$image_url_parts = @parse_url( $image_url ); | |
// Unable to parse | |
if ( ! is_array( $image_url_parts ) || empty( $image_url_parts['host'] ) || empty( $image_url_parts['path'] ) ) | |
return $image_url; | |
if ( is_array( $args ) ){ | |
// Convert values that are arrays into strings | |
foreach ( $args as $arg => $value ) { | |
if ( is_array( $value ) ) { | |
$args[$arg] = implode( ',', $value ); | |
} | |
} | |
// Encode values | |
// See http://core.trac.wordpress.org/ticket/17923 | |
$args = rawurlencode_deep( $args ); | |
if( $args ) { | |
// convert %2C back into commas | |
foreach( $args as $arg => $value) { | |
$with_commas[$arg] = str_replace( '%2C', ',', $value ); | |
} | |
$args = $with_commas; | |
} | |
} | |
// You can't run a Photon URL through Photon again because query strings are stripped. | |
// So if the image is already a Photon URL, append the new arguments to the existing URL. | |
if ( in_array( $image_url_parts['host'], array( 'i0.wp.com', 'i1.wp.com', 'i2.wp.com' ) ) ) { | |
$photon_url = add_query_arg( $args, $image_url ); | |
return jetpack_photon_url_scheme( $photon_url, $scheme ); | |
} | |
// This setting is Photon Server dependent | |
if ( ! apply_filters( 'jetpack_photon_any_extension_for_domain', false, $image_url_parts['host'] ) ) { | |
// Photon doesn't support query strings so we ignore them and look only at the path. | |
// However some source images are served via PHP so check the no-query-string extension. | |
// For future proofing, this is a blacklist of common issues rather than a whitelist. | |
$extension = pathinfo( $image_url_parts['path'], PATHINFO_EXTENSION ); | |
if ( empty( $extension ) || in_array( $extension, array( 'php' ) ) ) | |
return $image_url; | |
} | |
$image_host_path = $image_url_parts['host'] . $image_url_parts['path']; | |
// Figure out which CDN subdomain to use | |
srand( crc32( $image_host_path ) ); | |
$subdomain = rand( 0, 2 ); | |
srand(); | |
$photon_url = "http://i{$subdomain}.wp.com/$image_host_path"; | |
// This setting is Photon Server dependent | |
if ( isset( $image_url_parts['query'] ) && apply_filters( 'jetpack_photon_add_query_string_to_domain', false, $image_url_parts['host'] ) ) { | |
$photon_url .= '?q=' . rawurlencode( $image_url_parts['query'] ); | |
} | |
if ( $args ) { | |
if ( is_array( $args ) ) { | |
$photon_url = add_query_arg( $args, $photon_url ); | |
} else { | |
// You can pass a query string for complicated requests but where you still want CDN subdomain help, etc. | |
$photon_url .= '?' . $args; | |
} | |
} | |
return jetpack_photon_url_scheme( $photon_url, $scheme ); | |
} | |
add_filter( 'jetpack_photon_url', 'jetpack_photon_url', 10, 3 ); | |
/** | |
* WordPress.com | |
* | |
* If a cropped WP.com-hosted image is the source image, have Photon replicate the crop. | |
*/ | |
add_filter( 'jetpack_photon_pre_args', 'jetpack_photon_parse_wpcom_query_args', 10, 2 ); | |
function jetpack_photon_parse_wpcom_query_args( $args, $image_url ) { | |
$parsed_url = @parse_url( $image_url ); | |
if ( ! $parsed_url ) | |
return $args; | |
$image_url_parts = wp_parse_args( $parsed_url, array( | |
'host' => '', | |
'query' => '' | |
) ); | |
if ( '.files.wordpress.com' != substr( $image_url_parts['host'], -20 ) ) | |
return $args; | |
if ( empty( $image_url_parts['query'] ) ) | |
return $args; | |
$wpcom_args = wp_parse_args( $image_url_parts['query'] ); | |
if ( empty( $wpcom_args['w'] ) || empty( $wpcom_args['h'] ) ) | |
return $args; | |
// Keep the crop by using "resize" | |
if ( ! empty( $wpcom_args['crop'] ) ) { | |
if ( is_array( $args ) ) { | |
$args = array_merge( array( 'resize' => array( $wpcom_args['w'], $wpcom_args['h'] ) ), $args ); | |
} else { | |
$args = 'resize=' . rawurlencode( absint( $wpcom_args['w'] ) . ',' . absint( $wpcom_args['h'] ) ) . '&' . $args; | |
} | |
} else { | |
if ( is_array( $args ) ) { | |
$args = array_merge( array( 'fit' => array( $wpcom_args['w'], $wpcom_args['h'] ) ), $args ); | |
} else { | |
$args = 'fit=' . rawurlencode( absint( $wpcom_args['w'] ) . ',' . absint( $wpcom_args['h'] ) ) . '&' . $args; | |
} | |
} | |
return $args; | |
} | |
/** | |
*/ | |
add_filter( 'jetpack_photon_add_query_string_to_domain', 'jetpack_photon_allow_facebook_graph_domain', 10, 2 ); | |
add_filter( 'jetpack_photon_any_extension_for_domain', 'jetpack_photon_allow_facebook_graph_domain', 10, 2 ); | |
function jetpack_photon_url_scheme( $url, $scheme ) { | |
if ( ! in_array( $scheme, array( 'http', 'https', 'network_path' ) ) ) { | |
$scheme = is_ssl() ? 'https' : 'http'; | |
} | |
if ( 'network_path' == $scheme ) { | |
$scheme_slashes = '//'; | |
} else { | |
$scheme_slashes = "$scheme://"; | |
} | |
return preg_replace( '#^[a-z:]+//#i', $scheme_slashes, $url ); | |
} | |
function jetpack_photon_allow_facebook_graph_domain( $allow = false, $domain ) { | |
switch ( $domain ) { | |
case 'graph.facebook.com' : | |
return true; | |
} | |
return $allow; | |
} |
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