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File: class.photon.php
<?php class Jetpack_Photon { /** * Class variables */ // Oh look, a singleton private static $__instance = null; // Allowed extensions must match http://code.trac.wordpress.org/browser/photon/index.php#L31 protected static $extensions = array( 'gif', 'jpg', 'jpeg', 'png' ); // Don't access this directly. Instead, use self::image_sizes() so it's actually populated with something. protected static $image_sizes = null; /** * Singleton implementation * * @return object */ public static function instance() { if ( ! is_a( self::$__instance, 'Jetpack_Photon' ) ) { self::$__instance = new Jetpack_Photon; self::$__instance->setup(); } return self::$__instance; } /** * Silence is golden. */ private function __construct() {} /** * Register actions and filters, but only if basic Photon functions are available. * The basic functions are found in ./functions.photon.php. * * @uses add_action, add_filter * @return null */ private function setup() { // Display warning if site is private add_action( 'jetpack_activate_module_photon', array( $this, 'action_jetpack_activate_module_photon' ) ); if ( ! function_exists( 'jetpack_photon_url' ) ) return; // Images in post content and galleries add_filter( 'the_content', array( __CLASS__, 'filter_the_content' ), 999999 ); add_filter( 'get_post_gallery', array( __CLASS__, 'filter_the_content' ), 999999 ); // Core image retrieval add_filter( 'image_downsize', array( $this, 'filter_image_downsize' ), 10, 3 ); // Helpers for maniuplated images add_action( 'wp_enqueue_scripts', array( $this, 'action_wp_enqueue_scripts' ), 9 ); } /** * Check if site is private and warn user if it is * * @uses Jetpack::check_privacy * @action jetpack_activate_module_photon * @return null */ public function action_jetpack_activate_module_photon() { Jetpack::check_privacy( __FILE__ ); } /** ** IN-CONTENT IMAGE MANIPULATION FUNCTIONS **/ /** * Match all images and any relevant <a> tags in a block of HTML. * * @param string $content Some HTML. * @return array An array of $images matches, where $images[0] is * an array of full matches, and the link_url, img_tag, * and img_url keys are arrays of those matches. */ public static function parse_images_from_html( $content ) { $images = array(); if ( preg_match_all( '#(?:<a[^>]+?href=["|\'](?P<link_url>[^\s]+?)["|\'][^>]*?>\s*)?(?P<img_tag><img[^>]+?src=["|\'](?P<img_url>[^\s]+?)["|\'].*?>){1}(?:\s*</a>)?#is', $content, $images ) ) { foreach ( $images as $key => $unused ) { // Simplify the output as much as possible, mostly for confirming test results. if ( is_numeric( $key ) && $key > 0 ) unset( $images[$key] ); } return $images; } return array(); } /** * Try to determine height and width from strings WP appends to resized image filenames. * * @param string $src The image URL. * @return array An array consisting of width and height. */ public static function parse_dimensions_from_filename( $src ) { $width_height_string = array(); if ( preg_match( '#-(\d+)x(\d+)\.(?:' . implode('|', self::$extensions ) . '){1}$#i', $src, $width_height_string ) ) { $width = (int) $width_height_string[1]; $height = (int) $width_height_string[2]; if ( $width && $height ) return array( $width, $height ); } return array( false, false ); } /** * Identify images in post content, and if images are local (uploaded to the current site), pass through Photon. * * @param string $content * @uses self::validate_image_url, apply_filters, jetpack_photon_url, esc_url * @filter the_content * @return string */ public static function filter_the_content( $content ) { $images = Jetpack_Photon::parse_images_from_html( $content ); if ( ! empty( $images ) ) { $content_width = Jetpack::get_content_width(); $image_sizes = self::image_sizes(); $upload_dir = wp_upload_dir(); foreach ( $images[0] as $index => $tag ) { // Default to resize, though fit may be used in certain cases where a dimension cannot be ascertained $transform = 'resize'; // Start with a clean attachment ID each time $attachment_id = false; // Flag if we need to munge a fullsize URL $fullsize_url = false; // Identify image source $src = $src_orig = $images['img_url'][ $index ]; // Allow specific images to be skipped if ( apply_filters( 'jetpack_photon_skip_image', false, $src, $tag ) ) continue; // Support Automattic's Lazy Load plugin // Can't modify $tag yet as we need unadulterated version later if ( preg_match( '#data-lazy-src=["|\'](.+?)["|\']#i', $images['img_tag'][ $index ], $lazy_load_src ) ) { $placeholder_src = $placeholder_src_orig = $src; $src = $src_orig = $lazy_load_src[1]; } // Check if image URL should be used with Photon if ( self::validate_image_url( $src ) ) { // Find the width and height attributes $width = $height = false; // First, check the image tag if ( preg_match( '#width=["|\']?([\d%]+)["|\']?#i', $images['img_tag'][ $index ], $width_string ) ) $width = $width_string[1]; if ( preg_match( '#height=["|\']?([\d%]+)["|\']?#i', $images['img_tag'][ $index ], $height_string ) ) $height = $height_string[1]; // Can't pass both a relative width and height, so unset the height in favor of not breaking the horizontal layout. if ( false !== strpos( $width, '%' ) && false !== strpos( $height, '%' ) ) $width = $height = false; // Detect WP registered image size from HTML class if ( preg_match( '#class=["|\']?[^"\']*size-([^"\'\s]+)[^"\']*["|\']?#i', $images['img_tag'][ $index ], $size ) ) { $size = array_pop( $size ); if ( false === $width && false === $height && 'full' != $size && array_key_exists( $size, $image_sizes ) ) { $width = (int) $image_sizes[ $size ]['width']; $height = (int) $image_sizes[ $size ]['height']; $transform = $image_sizes[ $size ]['crop'] ? 'resize' : 'fit'; } } else { unset( $size ); } // WP Attachment ID, if uploaded to this site if ( preg_match( '#class=["|\']?[^"\']*wp-image-([\d]+)[^"\']*["|\']?#i', $images['img_tag'][ $index ], $attachment_id ) && ( 0 === strpos( $src, $upload_dir['baseurl'] ) || apply_filters( 'jetpack_photon_image_is_local', false, compact( 'src', 'tag', 'images', 'index' ) ) ) ) { $attachment_id = intval( array_pop( $attachment_id ) ); if ( $attachment_id ) { $attachment = get_post( $attachment_id ); // Basic check on returned post object if ( is_object( $attachment ) && ! is_wp_error( $attachment ) && 'attachment' == $attachment->post_type ) { $src_per_wp = wp_get_attachment_image_src( $attachment_id, isset( $size ) ? $size : 'full' ); if ( self::validate_image_url( $src_per_wp[0] ) ) { $src = $src_per_wp[0]; $fullsize_url = true; // Prevent image distortion if a detected dimension exceeds the image's natural dimensions if ( ( false !== $width && $width > $src_per_wp[1] ) || ( false !== $height && $height > $src_per_wp[2] ) ) { $width = false == $width ? false : min( $width, $src_per_wp[1] ); $height = false == $height ? false : min( $height, $src_per_wp[2] ); } // If no width and height are found, max out at source image's natural dimensions // Otherwise, respect registered image sizes' cropping setting if ( false == $width && false == $height ) { $width = $src_per_wp[1]; $height = $src_per_wp[2]; $transform = 'fit'; } elseif ( isset( $size ) && array_key_exists( $size, $image_sizes ) && isset( $image_sizes[ $size ]['crop'] ) ) { $transform = (bool) $image_sizes[ $size ]['crop'] ? 'resize' : 'fit'; } } } else { unset( $attachment_id ); unset( $attachment ); } } } // If image tag lacks width and height arguments, try to determine from strings WP appends to resized image filenames. if ( false === $width && false === $height ) { list( $width, $height ) = Jetpack_Photon::parse_dimensions_from_filename( $src ); } // If width is available, constrain to $content_width if ( false !== $width && false === strpos( $width, '%' ) && is_numeric( $content_width ) ) { if ( $width > $content_width && false !== $height && false === strpos( $height, '%' ) ) { $height = round( ( $content_width * $height ) / $width ); $width = $content_width; } elseif ( $width > $content_width ) { $width = $content_width; } } // Set a width if none is found and $content_width is available // If width is set in this manner and height is available, use `fit` instead of `resize` to prevent skewing if ( false === $width && is_numeric( $content_width ) ) { $width = (int) $content_width; if ( false !== $height ) $transform = 'fit'; } // Detect if image source is for a custom-cropped thumbnail and prevent further URL manipulation. if ( ! $fullsize_url && preg_match_all( '#-e[a-z0-9]+(-\d+x\d+)?\.(' . implode('|', self::$extensions ) . '){1}$#i', basename( $src ), $filename ) ) $fullsize_url = true; // Build URL, first maybe removing WP's resized string so we pass the original image to Photon if ( ! $fullsize_url ) { $src = self::strip_image_dimensions_maybe( $src ); } // Build array of Photon args and expose to filter before passing to Photon URL function $args = array(); if ( false !== $width && false !== $height && false === strpos( $width, '%' ) && false === strpos( $height, '%' ) ) $args[ $transform ] = $width . ',' . $height; elseif ( false !== $width ) $args['w'] = $width; elseif ( false !== $height ) $args['h'] = $height; $args = apply_filters( 'jetpack_photon_post_image_args', $args, compact( 'tag', 'src', 'src_orig', 'width', 'height' ) ); $photon_url = jetpack_photon_url( $src, $args ); // Modify image tag if Photon function provides a URL // Ensure changes are only applied to the current image by copying and modifying the matched tag, then replacing the entire tag with our modified version. if ( $src != $photon_url ) { $new_tag = $tag; // If present, replace the link href with a Photoned URL for the full-size image. if ( ! empty( $images['link_url'][ $index ] ) && self::validate_image_url( $images['link_url'][ $index ] ) ) $new_tag = preg_replace( '#(href=["|\'])' . $images['link_url'][ $index ] . '(["|\'])#i', '\1' . jetpack_photon_url( $images['link_url'][ $index ] ) . '\2', $new_tag, 1 ); // Supplant the original source value with our Photon URL $photon_url = esc_url( $photon_url ); $new_tag = str_replace( $src_orig, $photon_url, $new_tag ); // If Lazy Load is in use, pass placeholder image through Photon if ( isset( $placeholder_src ) && self::validate_image_url( $placeholder_src ) ) { $placeholder_src = jetpack_photon_url( $placeholder_src ); if ( $placeholder_src != $placeholder_src_orig ) $new_tag = str_replace( $placeholder_src_orig, esc_url( $placeholder_src ), $new_tag ); unset( $placeholder_src ); } // Remove the width and height arguments from the tag to prevent distortion $new_tag = preg_replace( '#(?<=\s)(width|height)=["|\']?[\d%]+["|\']?\s?#i', '', $new_tag ); // Tag an image for dimension checking $new_tag = preg_replace( '#(\s?/)?>(\s*</a>)?$#i', ' data-recalc-dims="1"\1>\2', $new_tag ); // Replace original tag with modified version $content = str_replace( $tag, $new_tag, $content ); } } elseif ( preg_match( '#^http(s)?://i[\d]{1}.wp.com#', $src ) && ! empty( $images['link_url'][ $index ] ) && self::validate_image_url( $images['link_url'][ $index ] ) ) { $new_tag = preg_replace( '#(href=["|\'])' . $images['link_url'][ $index ] . '(["|\'])#i', '\1' . jetpack_photon_url( $images['link_url'][ $index ] ) . '\2', $tag, 1 ); $content = str_replace( $tag, $new_tag, $content ); } } } return $content; } /** ** CORE IMAGE RETRIEVAL **/ /** * Filter post thumbnail image retrieval, passing images through Photon * * @param string|bool $image * @param int $attachment_id * @param string|array $size * @uses is_admin, apply_filters, wp_get_attachment_url, self::validate_image_url, this::image_sizes, jetpack_photon_url * @filter image_downsize * @return string|bool */ public function filter_image_downsize( $image, $attachment_id, $size ) { // Don't foul up the admin side of things, and provide plugins a way of preventing Photon from being applied to images. if ( is_admin() || apply_filters( 'jetpack_photon_override_image_downsize', false, compact( 'image', 'attachment_id', 'size' ) ) ) return $image; // Get the image URL and proceed with Photon-ification if successful $image_url = wp_get_attachment_url( $attachment_id ); if ( $image_url ) { // Check if image URL should be used with Photon if ( ! self::validate_image_url( $image_url ) ) return $image; // If an image is requested with a size known to WordPress, use that size's settings with Photon if ( ( is_string( $size ) || is_int( $size ) ) && array_key_exists( $size, self::image_sizes() ) ) { $image_args = self::image_sizes(); $image_args = $image_args[ $size ]; $photon_args = array(); // `full` is a special case in WP // To ensure filter receives consistent data regardless of requested size, `$image_args` is overridden with dimensions of original image. if ( 'full' == $size ) { $image_meta = wp_get_attachment_metadata( $attachment_id ); if ( isset( $image_meta['width'], $image_meta['height'] ) ) { // 'crop' is true so Photon's `resize` method is used $image_args = array( 'width' => $image_meta['width'], 'height' => $image_meta['height'], 'crop' => true ); } } // Expose determined arguments to a filter before passing to Photon $transform = $image_args['crop'] ? 'resize' : 'fit'; // Check specified image dimensions and account for possible zero values; photon fails to resize if a dimension is zero. if ( 0 == $image_args['width'] || 0 == $image_args['height'] ) { if ( 0 == $image_args['width'] && 0 < $image_args['height'] ) { $photon_args['h'] = $image_args['height']; } elseif ( 0 == $image_args['height'] && 0 < $image_args['width'] ) { $photon_args['w'] = $image_args['width']; } } else { if ( ( 'resize' === $transform ) && $image_meta = wp_get_attachment_metadata( $attachment_id ) ) { // Lets make sure that we don't upscale images since wp never upscales them as well $smaller_width = ( ( $image_meta['width'] < $image_args['width'] ) ? $image_meta['width'] : $image_args['width'] ); $smaller_height = ( ( $image_meta['height'] < $image_args['height'] ) ? $image_meta['height'] : $image_args['height'] ); $photon_args[ $transform ] = $smaller_width . ',' . $smaller_height; } else { $photon_args[ $transform ] = $image_args['width'] . ',' . $image_args['height']; } } $photon_args = apply_filters( 'jetpack_photon_image_downsize_string', $photon_args, compact( 'image_args', 'image_url', 'attachment_id', 'size', 'transform' ) ); // Generate Photon URL $image = array( jetpack_photon_url( $image_url, $photon_args ), false, false ); } elseif ( is_array( $size ) ) { // Pull width and height values from the provided array, if possible $width = isset( $size[0] ) ? (int) $size[0] : false; $height = isset( $size[1] ) ? (int) $size[1] : false; // Don't bother if necessary parameters aren't passed. if ( ! $width || ! $height ) return $image; // Expose arguments to a filter before passing to Photon $photon_args = array( 'fit' => $width . ',' . $height ); $photon_args = apply_filters( 'jetpack_photon_image_downsize_array', $photon_args, compact( 'width', 'height', 'image_url', 'attachment_id' ) ); // Generate Photon URL $image = array( jetpack_photon_url( $image_url, $photon_args ), false, false ); } } return $image; } /** ** GENERAL FUNCTIONS **/ /** * Ensure image URL is valid for Photon. * Though Photon functions address some of the URL issues, we should avoid unnecessary processing if we know early on that the image isn't supported. * * @param string $url * @uses wp_parse_args * @return bool */ protected static function validate_image_url( $url ) { $parsed_url = @parse_url( $url ); if ( ! $parsed_url ) return false; // Parse URL and ensure needed keys exist, since the array returned by `parse_url` only includes the URL components it finds. $url_info = wp_parse_args( $parsed_url, array( 'scheme' => null, 'host' => null, 'port' => null, 'path' => null ) ); // Bail if scheme isn't http or port is set that isn't port 80 if ( ( 'http' != $url_info['scheme'] || ! in_array( $url_info['port'], array( 80, null ) ) ) && apply_filters( 'jetpack_photon_reject_https', true ) ) return false; // Bail if no host is found if ( is_null( $url_info['host'] ) ) return false; // Bail if the image alredy went through Photon if ( preg_match( '#^i[\d]{1}.wp.com$#i', $url_info['host'] ) ) return false; // Bail if no path is found if ( is_null( $url_info['path'] ) ) return false; // Ensure image extension is acceptable if ( ! in_array( strtolower( pathinfo( $url_info['path'], PATHINFO_EXTENSION ) ), self::$extensions ) ) return false; // If we got this far, we should have an acceptable image URL // But let folks filter to decline if they prefer. return apply_filters( 'photon_validate_image_url', true, $url, $parsed_url ); } /** * Checks if the file exists before it passes the file to photon * * @param string $src The image URL * @return string **/ protected static function strip_image_dimensions_maybe( $src ){ $stripped_src = $src; // Build URL, first removing WP's resized string so we pass the original image to Photon if ( preg_match( '#(-\d+x\d+)\.(' . implode('|', self::$extensions ) . '){1}$#i', $src, $src_parts ) ) { $stripped_src = str_replace( $src_parts[1], '', $src ); $upload_dir = wp_upload_dir(); // Extracts the file path to the image minus the base url $file_path = substr( $stripped_src, strlen ( $upload_dir['baseurl'] ) ); if( file_exists( $upload_dir["basedir"] . $file_path ) ) $src = $stripped_src; } return $src; } /** * Provide an array of available image sizes and corresponding dimensions. * Similar to get_intermediate_image_sizes() except that it includes image sizes' dimensions, not just their names. * * @global $wp_additional_image_sizes * @uses get_option * @return array */ protected static function image_sizes() { if ( null == self::$image_sizes ) { global $_wp_additional_image_sizes; // Populate an array matching the data structure of $_wp_additional_image_sizes so we have a consistent structure for image sizes $images = array( 'thumb' => array( 'width' => intval( get_option( 'thumbnail_size_w' ) ), 'height' => intval( get_option( 'thumbnail_size_h' ) ), 'crop' => (bool) get_option( 'thumbnail_crop' ) ), 'medium' => array( 'width' => intval( get_option( 'medium_size_w' ) ), 'height' => intval( get_option( 'medium_size_h' ) ), 'crop' => false ), 'large' => array( 'width' => intval( get_option( 'large_size_w' ) ), 'height' => intval( get_option( 'large_size_h' ) ), 'crop' => false ), 'full' => array( 'width' => null, 'height' => null, 'crop' => false ) ); // Compatibility mapping as found in wp-includes/media.php $images['thumbnail'] = $images['thumb']; // Update class variable, merging in $_wp_additional_image_sizes if any are set if ( is_array( $_wp_additional_image_sizes ) && ! empty( $_wp_additional_image_sizes ) ) self::$image_sizes = array_merge( $images, $_wp_additional_image_sizes ); else self::$image_sizes = $images; } return is_array( self::$image_sizes ) ? self::$image_sizes : array(); } /** * Pass og:image URLs through Photon * * @param array $tags * @param array $parameters * @uses jetpack_photon_url * @return array */ function filter_open_graph_tags( $tags, $parameters ) { if ( empty( $tags['og:image'] ) ) { return $tags; } $photon_args = array( 'fit' => sprintf( '%d,%d', 2 * $parameters['image_width'], 2 * $parameters['image_height'] ), ); if ( is_array( $tags['og:image'] ) ) { $images = array(); foreach ( $tags['og:image'] as $image ) { $images[] = jetpack_photon_url( $image, $photon_args ); } $tags['og:image'] = $images; } else { $tags['og:image'] = jetpack_photon_url( $tags['og:image'], $photon_args ); } return $tags; } /** * Enqueue Photon helper script * * @uses wp_enqueue_script, plugins_url * @action wp_enqueue_script * @return null */ public function action_wp_enqueue_scripts() { wp_enqueue_script( 'jetpack-photon', plugins_url( 'modules/photon/photon.js', JETPACK__PLUGIN_FILE ), array( 'jquery' ), 20130122, true ); } }