--- /dev/null
+<?php
+/**
+ * Class for implementing site icon functionality.
+ *
+ * @since 4.3.0
+ */
+class WP_Site_Icon {
+
+ /**
+ * The minimum size of the site icon.
+ *
+ * @since 4.3.0
+ * @access public
+ * @var int
+ */
+ public $min_size = 512;
+
+ /**
+ * The size to which to crop the image so that we can display it in the UI nicely.
+ *
+ * @since 4.3.0
+ * @access public
+ * @var int
+ */
+ public $page_crop = 512;
+
+ /**
+ * List of site icon sizes.
+ *
+ * @since 4.3.0
+ * @access public
+ * @var array
+ */
+ public $site_icon_sizes = array(
+ /*
+ * Square, medium sized tiles for IE11+.
+ *
+ * See https://msdn.microsoft.com/library/dn455106(v=vs.85).aspx
+ */
+ 270,
+
+ /*
+ * App icon for Android/Chrome.
+ *
+ * @link https://developers.google.com/web/updates/2014/11/Support-for-theme-color-in-Chrome-39-for-Android
+ * @link https://developer.chrome.com/multidevice/android/installtohomescreen
+ */
+ 192,
+
+ /*
+ * App icons up to iPhone 6 Plus.
+ *
+ * See https://developer.apple.com/library/prerelease/ios/documentation/UserExperience/Conceptual/MobileHIG/IconMatrix.html
+ */
+ 180,
+
+ // Our regular Favicon.
+ 32,
+ );
+
+ /**
+ * Registers actions and filters.
+ *
+ * @since 4.3.0
+ * @access public
+ */
+ public function __construct() {
+ add_action( 'delete_attachment', array( $this, 'delete_attachment_data' ) );
+ add_filter( 'get_post_metadata', array( $this, 'get_post_metadata' ), 10, 4 );
+ }
+
+ /**
+ * Creates an attachment 'object'.
+ *
+ * @since 4.3.0
+ *
+ * @param string $cropped Cropped image URL.
+ * @param int $parent_attachment_id Attachment ID of parent image.
+ * @return array Attachment object.
+ */
+ public function create_attachment_object( $cropped, $parent_attachment_id ) {
+ $parent = get_post( $parent_attachment_id );
+ $parent_url = $parent->guid;
+ $url = str_replace( basename( $parent_url ), basename( $cropped ), $parent_url );
+
+ $size = @getimagesize( $cropped );
+ $image_type = ( $size ) ? $size['mime'] : 'image/jpeg';
+
+ $object = array(
+ 'ID' => $parent_attachment_id,
+ 'post_title' => basename( $cropped ),
+ 'post_content' => $url,
+ 'post_mime_type' => $image_type,
+ 'guid' => $url,
+ 'context' => 'site-icon'
+ );
+
+ return $object;
+ }
+
+ /**
+ * Inserts an attachment.
+ *
+ * @since 4.3.0
+ * @access public
+ *
+ * @param array $object Attachment object.
+ * @param string $file File path of the attached image.
+ * @return int Attachment ID
+ */
+ public function insert_attachment( $object, $file ) {
+ $attachment_id = wp_insert_attachment( $object, $file );
+ $metadata = wp_generate_attachment_metadata( $attachment_id, $file );
+
+ /**
+ * Filter the site icon attachment metadata.
+ *
+ * @since 4.3.0
+ *
+ * @see wp_generate_attachment_metadata()
+ *
+ * @param array $metadata Attachment metadata.
+ */
+ $metadata = apply_filters( 'site_icon_attachment_metadata', $metadata );
+ wp_update_attachment_metadata( $attachment_id, $metadata );
+
+ return $attachment_id;
+ }
+
+ /**
+ * Adds additional sizes to be made when creating the site_icon images.
+ *
+ * @since 4.3.0
+ * @access public
+ *
+ * @param array $sizes List of additional sizes.
+ * @return array Additional image sizes.
+ */
+ public function additional_sizes( $sizes = array() ) {
+ $only_crop_sizes = array();
+
+ /**
+ * Filter the different dimensions that a site icon is saved in.
+ *
+ * @since 4.3.0
+ *
+ * @param array $site_icon_sizes Sizes available for the Site Icon.
+ */
+ $this->site_icon_sizes = apply_filters( 'site_icon_image_sizes', $this->site_icon_sizes );
+
+ // Use a natural sort of numbers.
+ natsort( $this->site_icon_sizes );
+ $this->site_icon_sizes = array_reverse( $this->site_icon_sizes );
+
+ // ensure that we only resize the image into
+ foreach ( $sizes as $name => $size_array ) {
+ if ( isset( $size_array['crop'] ) ) {
+ $only_crop_sizes[ $name ] = $size_array;
+ }
+ }
+
+ foreach ( $this->site_icon_sizes as $size ) {
+ if ( $size < $this->min_size ) {
+ $only_crop_sizes[ 'site_icon-' . $size ] = array(
+ 'width ' => $size,
+ 'height' => $size,
+ 'crop' => true,
+ );
+ }
+ }
+
+ return $only_crop_sizes;
+ }
+
+ /**
+ * Adds Site Icon sizes to the array of image sizes on demand.
+ *
+ * @since 4.3.0
+ * @access public
+ *
+ * @param array $sizes List of image sizes.
+ * @return array List of intermediate image sizes.
+ */
+ public function intermediate_image_sizes( $sizes = array() ) {
+ /** This filter is documented in wp-admin/includes/class-wp-site-icon.php */
+ $this->site_icon_sizes = apply_filters( 'site_icon_image_sizes', $this->site_icon_sizes );
+ foreach ( $this->site_icon_sizes as $size ) {
+ $sizes[] = 'site_icon-' . $size;
+ }
+
+ return $sizes;
+ }
+
+ /**
+ * Deletes the Site Icon when the image file is deleted.
+ *
+ * @since 4.3.0
+ * @access public
+ *
+ * @param int $post_id Attachment ID.
+ */
+ public function delete_attachment_data( $post_id ) {
+ $site_icon_id = get_option( 'site_icon' );
+
+ if ( $site_icon_id && $post_id == $site_icon_id ) {
+ delete_option( 'site_icon' );
+ }
+ }
+
+ /**
+ * Adds custom image sizes when meta data for an image is requested, that happens to be used as Site Icon.
+ *
+ * @since 4.3.0
+ * @access public
+ *
+ * @param null|array|string $value The value get_metadata() should return a single metadata value, or an
+ * array of values.
+ * @param int $post_id Post ID.
+ * @param string $meta_key Meta key.
+ * @param string|array $single Meta value, or an array of values.
+ * @return array|null|string The attachment metadata value, array of values, or null.
+ */
+ public function get_post_metadata( $value, $post_id, $meta_key, $single ) {
+ $site_icon_id = get_option( 'site_icon' );
+
+ if ( $post_id == $site_icon_id && '_wp_attachment_backup_sizes' == $meta_key && $single ) {
+ add_filter( 'intermediate_image_sizes', array( $this, 'intermediate_image_sizes' ) );
+ }
+
+ return $value;
+ }
+}
+
+/**
+ * @global WP_Site_Icon $wp_site_icon
+ */
+$GLOBALS['wp_site_icon'] = new WP_Site_Icon;
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