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<?php |
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|
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/** |
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* Generates a Photon URL. |
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* |
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* @see http://developer.wordpress.com/docs/photon/ |
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* |
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* @param string $image_url URL to the publicly accessible image you want to manipulate |
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* @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) |
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* @return string The raw final URL. You should run this through esc_url() before displaying it. |
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*/ |
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function jetpack_photon_url( $image_url, $args = array(), $scheme = null ) { |
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$image_url = trim( $image_url ); |
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|
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if ( class_exists( 'Jetpack') ) { |
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/** |
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* Disables Photon URL processing for local development |
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* |
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* @module photon |
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* |
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* @since 4.1.0 |
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* |
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* @param bool false Result of Jetpack::is_development_mode. |
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*/ |
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if ( true === apply_filters( 'jetpack_photon_development_mode', Jetpack::is_development_mode() ) ) { |
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return $image_url; |
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} |
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} |
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|
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/** |
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* Allow specific image URls to avoid going through Photon. |
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* |
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* @module photon |
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* |
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* @since 3.2.0 |
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* |
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* @param bool false Should the image be returned as is, without going through Photon. Default to false. |
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* @param string $image_url Image URL. |
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* @param array|string $args Array of Photon arguments. |
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* @param string|null $scheme Image scheme. Default to null. |
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*/ |
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if ( false !== apply_filters( 'jetpack_photon_skip_for_url', false, $image_url, $args, $scheme ) ) { |
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return $image_url; |
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} |
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|
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/** |
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* Filter the original image URL before it goes through Photon. |
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* |
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* @module photon |
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* |
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* @since 1.9.0 |
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* |
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* @param string $image_url Image URL. |
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* @param array|string $args Array of Photon arguments. |
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* @param string|null $scheme Image scheme. Default to null. |
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*/ |
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$image_url = apply_filters( 'jetpack_photon_pre_image_url', $image_url, $args, $scheme ); |
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/** |
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* Filter the original Photon image parameters before Photon is applied to an image. |
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* |
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* @module photon |
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* |
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* @since 1.9.0 |
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* |
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* @param array|string $args Array of Photon arguments. |
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* @param string $image_url Image URL. |
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* @param string|null $scheme Image scheme. Default to null. |
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*/ |
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$args = apply_filters( 'jetpack_photon_pre_args', $args, $image_url, $scheme ); |
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|
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if ( empty( $image_url ) ) |
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return $image_url; |
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|
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$image_url_parts = @jetpack_photon_parse_url( $image_url ); |
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|
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// Unable to parse |
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if ( ! is_array( $image_url_parts ) || empty( $image_url_parts['host'] ) || empty( $image_url_parts['path'] ) ) |
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return $image_url; |
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|
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if ( is_array( $args ) ){ |
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// Convert values that are arrays into strings |
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foreach ( $args as $arg => $value ) { |
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if ( is_array( $value ) ) { |
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$args[$arg] = implode( ',', $value ); |
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} |
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} |
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|
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// Encode values |
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// See http://core.trac.wordpress.org/ticket/17923 |
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$args = rawurlencode_deep( $args ); |
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} |
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|
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/* Don't photon-ize WPCOM hosted images with only the following url args: |
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* `w`, `h`, `fit`, `crop`, `zoom`, `strip`, `resize`, `quality` |
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* These args can just be added to the wpcom-version of the image, and save on latency. |
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*/ |
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$is_wpcom_image_with_safe_args = false; |
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$allowed_wpcom_keys = array( |
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'w' => true, |
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'h' => true, |
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'fit' => true, |
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'crop' => true, |
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'zoom' => true, |
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'strip' => true, |
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'resize' => true, |
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'quality' => true, |
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); |
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if ( wp_endswith( strtolower( $image_url_parts['host'] ), '.files.wordpress.com' ) && ! array_diff_key( $args, $allowed_wpcom_keys ) ) { |
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$is_wpcom_image_with_safe_args = true; |
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} |
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|
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/** This filter is documented below. */ |
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$custom_photon_url = apply_filters( 'jetpack_photon_domain', '', $image_url ); |
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$custom_photon_url = esc_url( $custom_photon_url ); |
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|
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// You can't run a Photon URL through Photon again because query strings are stripped. |
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// So if the image is already a Photon URL, append the new arguments to the existing URL. |
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// Alternately, if it's a *.files.wordpress.com url, and the arguments are supported, keep the domain. |
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if ( |
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in_array( $image_url_parts['host'], array( 'i0.wp.com', 'i1.wp.com', 'i2.wp.com' ) ) |
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|| $image_url_parts['host'] === jetpack_photon_parse_url( $custom_photon_url, PHP_URL_HOST ) |
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|| $is_wpcom_image_with_safe_args |
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) { |
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$photon_url = add_query_arg( $args, $image_url ); |
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return jetpack_photon_url_scheme( $photon_url, $scheme ); |
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} |
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|
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/** |
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* Allow Photon to use query strings as well. |
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* By default, Photon doesn't support query strings so we ignore them and look only at the path. |
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* This setting is Photon Server dependent. |
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* |
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* @module photon |
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* |
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* @since 1.9.0 |
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* |
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* @param bool false Should images using query strings go through Photon. Default is false. |
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* @param string $image_url_parts['host'] Image URL's host. |
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*/ |
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if ( ! apply_filters( 'jetpack_photon_any_extension_for_domain', false, $image_url_parts['host'] ) ) { |
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// Photon doesn't support query strings so we ignore them and look only at the path. |
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// However some source images are served via PHP so check the no-query-string extension. |
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// For future proofing, this is a blacklist of common issues rather than a whitelist. |
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$extension = pathinfo( $image_url_parts['path'], PATHINFO_EXTENSION ); |
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if ( empty( $extension ) || in_array( $extension, array( 'php', 'ashx' ) ) ) |
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return $image_url; |
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} |
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|
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$image_host_path = $image_url_parts['host'] . $image_url_parts['path']; |
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|
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// Figure out which CDN subdomain to use |
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srand( crc32( $image_host_path ) ); |
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$subdomain = rand( 0, 2 ); |
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srand(); |
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|
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/** |
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* Filters the domain used by the Photon module. |
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* |
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* @module photon |
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* |
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* @since 3.4.2 |
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* |
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* @param string https://i{$subdomain}.wp.com Domain used by Photon. $subdomain is a random number between 0 and 2. |
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* @param string $image_url URL of the image to be photonized. |
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*/ |
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$photon_domain = apply_filters( 'jetpack_photon_domain', "https://i{$subdomain}.wp.com", $image_url ); |
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$photon_domain = trailingslashit( esc_url( $photon_domain ) ); |
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$photon_url = $photon_domain . $image_host_path; |
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|
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/** |
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* Add query strings to Photon URL. |
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* By default, Photon doesn't support query strings so we ignore them. |
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* This setting is Photon Server dependent. |
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* |
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* @module photon |
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* |
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* @since 1.9.0 |
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* |
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* @param bool false Should query strings be added to the image URL. Default is false. |
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* @param string $image_url_parts['host'] Image URL's host. |
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*/ |
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if ( isset( $image_url_parts['query'] ) && apply_filters( 'jetpack_photon_add_query_string_to_domain', false, $image_url_parts['host'] ) ) { |
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$photon_url .= '?q=' . rawurlencode( $image_url_parts['query'] ); |
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} |
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|
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if ( $args ) { |
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if ( is_array( $args ) ) { |
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$photon_url = add_query_arg( $args, $photon_url ); |
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} else { |
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// You can pass a query string for complicated requests but where you still want CDN subdomain help, etc. |
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$photon_url .= '?' . $args; |
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} |
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} |
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|
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if ( isset( $image_url_parts['scheme'] ) && 'https' == $image_url_parts['scheme'] ) { |
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$photon_url = add_query_arg( array( 'ssl' => 1 ), $photon_url ); |
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} |
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|
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return jetpack_photon_url_scheme( $photon_url, $scheme ); |
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} |
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add_filter( 'jetpack_photon_url', 'jetpack_photon_url', 10, 3 ); |
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|
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/** |
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* WordPress.com |
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* |
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* If a cropped WP.com-hosted image is the source image, have Photon replicate the crop. |
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*/ |
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add_filter( 'jetpack_photon_pre_args', 'jetpack_photon_parse_wpcom_query_args', 10, 2 ); |
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|
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function jetpack_photon_parse_wpcom_query_args( $args, $image_url ) { |
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$parsed_url = @parse_url( $image_url ); |
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|
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if ( ! $parsed_url ) |
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return $args; |
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|
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$image_url_parts = wp_parse_args( $parsed_url, array( |
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'host' => '', |
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'query' => '' |
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) ); |
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|
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if ( '.files.wordpress.com' != substr( $image_url_parts['host'], -20 ) ) |
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return $args; |
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|
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if ( empty( $image_url_parts['query'] ) ) |
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return $args; |
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|
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$wpcom_args = wp_parse_args( $image_url_parts['query'] ); |
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|
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if ( empty( $wpcom_args['w'] ) || empty( $wpcom_args['h'] ) ) |
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return $args; |
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|
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// Keep the crop by using "resize" |
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if ( ! empty( $wpcom_args['crop'] ) ) { |
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if ( is_array( $args ) ) { |
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$args = array_merge( array( 'resize' => array( $wpcom_args['w'], $wpcom_args['h'] ) ), $args ); |
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} else { |
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$args = 'resize=' . rawurlencode( absint( $wpcom_args['w'] ) . ',' . absint( $wpcom_args['h'] ) ) . '&' . $args; |
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} |
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} else { |
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if ( is_array( $args ) ) { |
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$args = array_merge( array( 'fit' => array( $wpcom_args['w'], $wpcom_args['h'] ) ), $args ); |
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} else { |
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$args = 'fit=' . rawurlencode( absint( $wpcom_args['w'] ) . ',' . absint( $wpcom_args['h'] ) ) . '&' . $args; |
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} |
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} |
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|
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return $args; |
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} |
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|
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function jetpack_photon_url_scheme( $url, $scheme ) { |
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if ( ! in_array( $scheme, array( 'http', 'https', 'network_path' ) ) ) { |
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if ( preg_match( '#^(https?:)?//#', $url ) ) { |
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return $url; |
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} |
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|
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$scheme = 'http'; |
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} |
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|
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if ( 'network_path' == $scheme ) { |
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$scheme_slashes = '//'; |
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} else { |
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$scheme_slashes = "$scheme://"; |
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} |
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|
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return preg_replace( '#^([a-z:]+)?//#i', $scheme_slashes, $url ); |
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} |
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|
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/** |
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* A wrapper for PHP's parse_url, prepending assumed scheme for network path |
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* URLs. PHP versions 5.4.6 and earlier do not correctly parse without scheme. |
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* |
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* @see http://php.net/manual/en/function.parse-url.php#refsect1-function.parse-url-changelog |
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* |
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* @param string $url The URL to parse |
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* @param integer $component Retrieve specific URL component |
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* @return mixed Result of parse_url |
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*/ |
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function jetpack_photon_parse_url( $url, $component = -1 ) { |
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if ( 0 === strpos( $url, '//' ) ) { |
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$url = ( is_ssl() ? 'https:' : 'http:' ) . $url; |
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} |
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|
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return parse_url( $url, $component ); |
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} |
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|
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add_filter( 'jetpack_photon_skip_for_url', 'jetpack_photon_banned_domains', 9, 2 ); |
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function jetpack_photon_banned_domains( $skip, $image_url ) { |
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$banned_host_patterns = array( |
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'/^chart\.googleapis\.com$/', |
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'/^chart\.apis\.google\.com$/', |
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'/^graph\.facebook\.com$/', |
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'/\.fbcdn\.net$/' |
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); |
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|
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$host = jetpack_photon_parse_url( $image_url, PHP_URL_HOST ); |
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|
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foreach ( $banned_host_patterns as $banned_host_pattern ) { |
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if ( 1 === preg_match( $banned_host_pattern, $host ) ) { |
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return true; |
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} |
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} |
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|
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return $skip; |
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} |
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|
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|
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/** |
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* Jetpack Photon - Support Text Widgets. |
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* |
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* @access public |
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* @param string $content Content from text widget. |
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* @return string |
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*/ |
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function jetpack_photon_support_text_widgets( $content ) { |
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if ( class_exists( 'Jetpack_Photon' ) && Jetpack::is_module_active( 'photon' ) ) { |
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return Jetpack_Photon::filter_the_content( $content ); |
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} |
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return $content; |
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} |
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add_filter( 'widget_text', 'jetpack_photon_support_text_widgets' ); |
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|
