initial

wp-content/plugins/jetpack/jetpack_vendor/automattic/jetpack-post-media/CHANGELOG.md

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+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [0.1.6] - 2026-06-15
+### Changed
+- Internal updates.
+
+## [0.1.5] - 2026-06-08
+### Changed
+- Internal updates.
+
+## [0.1.4] - 2026-06-01
+### Fixed
+- WooCommerce: Include product gallery images when extracting post media. [#49170]
+
+## [0.1.3] - 2026-05-19
+### Changed
+- Internal updates.
+
+## [0.1.2] - 2026-05-04
+### Changed
+- Internal: No longer require automattic/jetpack-changelogger as a per-project dev dependency. [#48225]
+
+## [0.1.1] - 2026-02-26
+### Changed
+- Use the new `Images` class instead of `Jetpack_PostImages` in Twitter Cards. [#47249]
+
+## 0.1.0 - 2026-02-23
+### Added
+- Add `Images` class (copy of `Jetpack_PostImages`) for extracting images from WordPress posts. [#47208]
+- Add `Shortcodes` class with methods to extract media identifiers from shortcode attributes (YouTube, Vimeo, TED, VideoPress, Hulu, Archive.org). [#47200]
+- Initial version. [#47164]
+- Twitter Cards: Add `Twitter_Cards` class with methods for generating Twitter Card meta tags. [#47169]
+
+[0.1.6]: https://github.com/Automattic/jetpack-post-media/compare/v0.1.5...v0.1.6
+[0.1.5]: https://github.com/Automattic/jetpack-post-media/compare/v0.1.4...v0.1.5
+[0.1.4]: https://github.com/Automattic/jetpack-post-media/compare/v0.1.3...v0.1.4
+[0.1.3]: https://github.com/Automattic/jetpack-post-media/compare/v0.1.2...v0.1.3
+[0.1.2]: https://github.com/Automattic/jetpack-post-media/compare/v0.1.1...v0.1.2
+[0.1.1]: https://github.com/Automattic/jetpack-post-media/compare/v0.1.0...v0.1.1

wp-content/plugins/jetpack/jetpack_vendor/automattic/jetpack-post-media/src/class-post-media.php

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+<?php
+/**
+ * Package description here
+ *
+ * @package automattic/jetpack-post-media
+ */
+
+namespace Automattic\Jetpack;
+
+/**
+ * Class description.
+ */
+class Post_Media {
+
+	const PACKAGE_VERSION = '0.1.6';
+}

wp-content/plugins/jetpack/jetpack_vendor/automattic/jetpack-post-media/src/class-shortcodes.php

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+<?php
+/**
+ * Shortcode ID extraction methods.
+ *
+ * Provides static methods to extract identifiers from shortcode attributes
+ * for various media types (YouTube, Vimeo, TED, VideoPress, etc.).
+ *
+ * @package automattic/jetpack-post-media
+ */
+
+namespace Automattic\Jetpack;
+
+/**
+ * Extracts media identifiers from shortcode attributes.
+ *
+ * @since 0.1.0
+ */
+class Shortcodes {
+
+	/**
+	 * Get an ID from a shortcode attribute by key.
+	 *
+	 * Used for shortcodes that store their identifier in a single attribute,
+	 * e.g. ted and hulu use a named 'id' attribute, while wpvideo and
+	 * videopress use the first positional attribute.
+	 *
+	 * @since 0.1.0
+	 *
+	 * @param array      $atts Shortcode attributes.
+	 * @param string|int $key  The attribute key to look up. Defaults to 0 (first positional attribute).
+	 * @return string|int The attribute value, or 0 if not found.
+	 */
+	public static function get_attribute_id( $atts, $key = 0 ) {
+		return ! empty( $atts[ $key ] ) ? $atts[ $key ] : 0;
+	}
+
+	/**
+	 * Normalizes a YouTube URL to include a v= parameter and a query string free of encoded ampersands.
+	 *
+	 * Handles youtu.be short links, /v/ paths, /shorts/ paths, playlist URLs, and encoded ampersands.
+	 *
+	 * @since 0.1.0
+	 *
+	 * @param string|array $url YouTube URL, or an array with a 'url' key.
+	 * @return string|false The normalized URL, or false if input is invalid.
+	 */
+	public static function sanitize_youtube_url( $url ) {
+		if ( is_array( $url ) && isset( $url['url'] ) ) {
+			$url = $url['url'];
+		}
+		if ( ! is_string( $url ) ) {
+			return false;
+		}
+
+		$url = trim( $url, ' "' );
+		$url = trim( $url );
+		$url = str_replace(
+			array( 'youtu.be/', '/v/', '/shorts/', '#!v=', '&amp;', '&#038;', 'playlist' ),
+			array( 'youtu.be/?v=', '/?v=', '/watch?v=', '?v=', '&', '&', 'videoseries' ),
+			$url
+		);
+
+		// Replace any extra question marks with ampersands - the result of a URL like
+		// "https://www.youtube.com/v/dQw4w9WgXcQ?fs=1&hl=en_US" being passed in.
+		$query_string_start = strpos( $url, '?' );
+
+		if ( false !== $query_string_start ) {
+			$url = substr( $url, 0, $query_string_start + 1 ) . str_replace( '?', '&', substr( $url, $query_string_start + 1 ) );
+		}
+
+		return $url;
+	}
+
+	/**
+	 * Extract a YouTube video or playlist ID from shortcode attributes.
+	 *
+	 * @since 0.1.0
+	 *
+	 * @param string|array $atts Shortcode attributes. Can be just the URL string or the full $atts array.
+	 * @return string|false The YouTube video or playlist ID, or false on failure.
+	 */
+	public static function get_youtube_id( $atts ) {
+		// Do we have an $atts array? Get first att.
+		if ( is_array( $atts ) ) {
+			$atts = reset( $atts );
+		}
+
+		$url = self::sanitize_youtube_url( $atts );
+
+		if ( ! is_string( $url ) || '' === $url ) {
+			return false;
+		}
+
+		$parsed = parse_url( $url ); // phpcs:ignore WordPress.WP.AlternativeFunctions.parse_url_parse_url
+
+		if ( ! is_array( $parsed ) || ! isset( $parsed['query'] ) ) {
+			return false;
+		}
+
+		parse_str( $parsed['query'], $qargs );
+
+		if ( ! isset( $qargs['v'] ) && ! isset( $qargs['list'] ) ) {
+			return false;
+		}
+
+		$id = '';
+
+		if ( isset( $qargs['list'] ) ) {
+			$id = preg_replace( '|[^_a-z0-9-]|i', '', $qargs['list'] );
+		}
+
+		if ( empty( $id ) && isset( $qargs['v'] ) ) {
+			$id = preg_replace( '|[^_a-z0-9-]|i', '', $qargs['v'] );
+		}
+
+		return empty( $id ) ? false : $id;
+	}
+
+	/**
+	 * Extract a Vimeo video ID from shortcode attributes.
+	 *
+	 * Supports numeric IDs and various Vimeo URL formats including
+	 * groups, albums, channels, and player URLs.
+	 *
+	 * @since 0.1.0
+	 *
+	 * @param array $atts Shortcode attributes.
+	 * @return int The Vimeo video ID, or 0 if not found.
+	 */
+	public static function get_vimeo_id( $atts ) {
+		if ( isset( $atts[0] ) ) {
+			$atts[0] = trim( $atts[0], '=' );
+			if ( is_numeric( $atts[0] ) ) {
+				return (int) $atts[0];
+			}
+
+			/**
+			 * Extract Vimeo ID from the URL. For examples:
+			 * https://vimeo.com/12345
+			 * https://vimeo.com/289091934/cd1f466bcc
+			 * https://vimeo.com/album/2838732/video/6342264
+			 * https://vimeo.com/groups/758728/videos/897094040
+			 * https://vimeo.com/channels/staffpicks/videos/123456789
+			 * https://vimeo.com/album/1234567/video/7654321
+			 * https://player.vimeo.com/video/18427511
+			 */
+			$pattern = '/(?:https?:\/\/)?vimeo\.com\/(?:groups\/[^\/]+\/videos\/|album\/\d+\/video\/|video\/|channels\/[^\/]+\/videos\/|[^\/]+\/)?([0-9]+)(?:[^\'\"0-9<]|$)/i';
+			$match   = array();
+			if ( preg_match( $pattern, $atts[0], $match ) ) {
+				return (int) $match[1];
+			}
+		}
+
+		return 0;
+	}
+
+	/**
+	 * Get the unique ID of a TED video from shortcode attributes.
+	 *
+	 * @since 0.1.0
+	 *
+	 * @param array $atts Shortcode attributes.
+	 * @return string|int The TED video ID, or 0 if not found.
+	 */
+	public static function get_ted_id( $atts ) {
+		return self::get_attribute_id( $atts, 'id' );
+	}
+
+	/**
+	 * Get a VideoPress ID from wpvideo shortcode attributes.
+	 *
+	 * @since 0.1.0
+	 *
+	 * @param array $atts Shortcode attributes.
+	 * @return string|int The VideoPress ID, or 0 if not found.
+	 */
+	public static function get_wpvideo_id( $atts ) {
+		return self::get_attribute_id( $atts );
+	}
+
+	/**
+	 * Get a VideoPress ID from videopress shortcode attributes.
+	 *
+	 * @since 0.1.0
+	 *
+	 * @param array $atts Shortcode attributes.
+	 * @return string|int The VideoPress ID, or 0 if not found.
+	 */
+	public static function get_videopress_id( $atts ) {
+		return self::get_attribute_id( $atts );
+	}
+
+	/**
+	 * Get a Hulu video ID from shortcode attributes.
+	 *
+	 * @since 0.1.0
+	 *
+	 * @param array $atts Shortcode attributes.
+	 * @return string|int The Hulu video ID, or 0 if not found.
+	 */
+	public static function get_hulu_id( $atts ) {
+		return self::get_attribute_id( $atts, 'id' );
+	}
+
+	/**
+	 * Get an Archive.org embed ID from shortcode attributes.
+	 *
+	 * Extracts the identifier from an Archive.org details or embed URL,
+	 * or uses the raw attribute value if it is not a URL.
+	 *
+	 * @since 0.1.0
+	 *
+	 * @param array $atts Shortcode attributes.
+	 * @return string|int The Archive.org identifier, the raw attribute value
+	 *                     (which may be empty), or 0 if the attribute is not set.
+	 */
+	public static function get_archiveorg_id( $atts ) {
+		if ( isset( $atts[0] ) ) {
+			$atts[0] = trim( $atts[0], '=' );
+			if ( preg_match( '~archive\.org/(details|embed)/([^/?#]+)~i', $atts[0], $match ) ) {
+				$id = $match[2];
+			} else {
+				$id = $atts[0];
+			}
+			return $id;
+		}
+		return 0;
+	}
+
+	/**
+	 * Get an Archive.org book embed ID from shortcode attributes.
+	 *
+	 * Extracts the identifier from an Archive.org stream URL,
+	 * or uses the raw attribute value if it is not a URL.
+	 *
+	 * @since 0.1.0
+	 *
+	 * @param array $atts Shortcode attributes.
+	 * @return string|int The Archive.org book identifier, the raw attribute value
+	 *                     (which may be empty), or 0 if the attribute is not set.
+	 */
+	public static function get_archiveorg_book_id( $atts ) {
+		if ( isset( $atts[0] ) ) {
+			$atts[0] = trim( $atts[0], '=' );
+			if ( preg_match( '~archive\.org/stream/([^/?#]+)~i', $atts[0], $match ) ) {
+				$id = $match[1];
+			} else {
+				$id = $atts[0];
+			}
+			return $id;
+		}
+		return 0;
+	}
+}

wp-content/plugins/jetpack/jetpack_vendor/automattic/jetpack-post-media/src/class-twitter-cards.php

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+<?php
+/**
+ * Twitter Cards handling.
+ *
+ * @package automattic/jetpack-post-media
+ */
+
+namespace Automattic\Jetpack\Post_Media;
+
+use WP_Post;
+
+/**
+ * Twitter Cards
+ *
+ * Hooks onto the Open Graph protocol and extends it by adding only the tags
+ * we need for twitter cards.
+ *
+ * @see https://dev.twitter.com/cards/overview
+ */
+class Twitter_Cards {
+
+	/**
+	 * Adds Twitter Card tags.
+	 *
+	 * @param array $og_tags Existing OG tags.
+	 *
+	 * @return array OG tags inclusive of Twitter Card output.
+	 */
+	public static function twitter_cards_tags( $og_tags ) {
+		global $post;
+		$post_id = ( $post instanceof WP_Post ) ? $post->ID : null;
+
+		/**
+		 * Maximum alt text length.
+		 *
+		 * @see https://developer.twitter.com/en/docs/tweets/optimize-with-cards/overview/summary-card-with-large-image.html
+		 */
+		$alt_length = 420;
+
+		if ( post_password_required() ) {
+			return $og_tags;
+		}
+
+		/** This action is documented in class.jetpack.php */
+		if ( apply_filters( 'jetpack_disable_twitter_cards', false ) ) {
+			return $og_tags;
+		}
+
+		/*
+		 * These tags apply to any page (home, archives, etc).
+		 */
+
+		// If we have information on the author/creator, then include that as well.
+		if ( ! empty( $post ) && ! empty( $post->post_author ) ) {
+			/** This action is documented in modules/sharedaddy/sharing-sources.php */
+			$handle = apply_filters( 'jetpack_sharing_twitter_via', '', $post_id );
+			if ( ! empty( $handle ) && ! self::is_default_site_tag( $handle ) ) {
+				$og_tags['twitter:creator'] = self::sanitize_twitter_user( $handle );
+			}
+		}
+
+		$site_tag = self::site_tag();
+		/** This action is documented in modules/sharedaddy/sharing-sources.php */
+		$site_tag = apply_filters( 'jetpack_sharing_twitter_via', $site_tag, ( is_singular() ? $post_id : null ) );
+		/** This action is documented in modules/sharedaddy/sharing-sources.php */
+		$site_tag = apply_filters( 'jetpack_twitter_cards_site_tag', $site_tag, $og_tags );
+		if ( ! empty( $site_tag ) ) {
+			$og_tags['twitter:site'] = self::sanitize_twitter_user( $site_tag );
+		}
+
+		if ( ! is_singular() || ! empty( $og_tags['twitter:card'] ) ) {
+			/**
+			 * Filter the default Twitter card image, used when no image can be found in a post.
+			 *
+			 * @module sharedaddy
+			 *
+			 * @since jetpack-5.9.0
+			 *
+			 * @param string $str Default image URL.
+			 */
+			$image = apply_filters( 'jetpack_twitter_cards_image_default', '' );
+			if ( ! empty( $image ) ) {
+				$og_tags['twitter:image'] = $image;
+			}
+
+			return $og_tags;
+		}
+
+		$the_title = get_the_title();
+		if ( ! $the_title ) {
+			$the_title = get_bloginfo( 'name' );
+		}
+		$og_tags['twitter:text:title'] = $the_title;
+
+		/*
+		 * The following tags only apply to single pages.
+		 */
+
+		$card_type = 'summary';
+
+		// Try to give priority to featured images.
+		if ( ! empty( $post_id ) ) {
+			$post_image = Images::get_image(
+				$post_id,
+				array(
+					'width'  => 144,
+					'height' => 144,
+				)
+			);
+			if ( ! empty( $post_image ) && is_array( $post_image ) ) {
+				// 4096 is the maximum size for an image per https://developer.twitter.com/en/docs/tweets/optimize-with-cards/overview/summary .
+				if (
+					isset( $post_image['src_width'] ) && isset( $post_image['src_height'] )
+					&& (int) $post_image['src_width'] <= 4096
+					&& (int) $post_image['src_height'] <= 4096
+				) {
+					// 300x157 is the minimum size for a summary_large_image per https://developer.twitter.com/en/docs/tweets/optimize-with-cards/overview/summary-card-with-large-image .
+					if ( (int) $post_image['src_width'] >= 300 && (int) $post_image['src_height'] >= 157 ) {
+						$card_type                = 'summary_large_image';
+						$og_tags['twitter:image'] = esc_url( add_query_arg( 'w', 640, $post_image['src'] ) );
+					} else {
+						$og_tags['twitter:image'] = esc_url( add_query_arg( 'w', 144, $post_image['src'] ) );
+					}
+
+					// Add the alt tag if we have one.
+					if ( ! empty( $post_image['alt_text'] ) ) {
+						// Shorten it if it is too long.
+						if ( strlen( $post_image['alt_text'] ) > $alt_length ) {
+							$og_tags['twitter:image:alt'] = esc_attr( mb_substr( $post_image['alt_text'], 0, $alt_length ) . '…' );
+						} else {
+							$og_tags['twitter:image:alt'] = esc_attr( $post_image['alt_text'] );
+						}
+					}
+				}
+			}
+		}
+
+		$extract = array();
+
+		// Only proceed with media analysis if a featured image has not superseded it already.
+		if ( empty( $og_tags['twitter:image'] ) && empty( $og_tags['twitter:image:src'] ) ) {
+			// @todo Jetpack_Media_Summary is defined in the Jetpack plugin. It should be moved to this package.
+			if ( ! class_exists( 'Jetpack_Media_Summary' ) && defined( 'JETPACK__PLUGIN_DIR' ) ) {
+				require_once JETPACK__PLUGIN_DIR . '_inc/lib/class.media-summary.php';
+			}
+
+			// Test again, class should already be auto-loaded in Jetpack.
+			// If not, skip extra media analysis and stick with a summary card.
+			if ( class_exists( 'Jetpack_Media_Summary' ) && ! empty( $post_id ) ) {
+				$extract = \Jetpack_Media_Summary::get( $post_id ); // @phan-suppress-current-line PhanUndeclaredClassMethod -- Guarded by class_exists().
+
+				if ( 'gallery' === $extract['type'] ) {
+					list( $og_tags, $card_type ) = self::twitter_cards_define_type_based_on_image_count( $og_tags, $extract );
+				} elseif ( 'video' === $extract['type'] ) {
+					// Leave as summary, but with large pict of poster frame (we know those comply to Twitter's size requirements).
+					$card_type                = 'summary_large_image';
+					$og_tags['twitter:image'] = esc_url( add_query_arg( 'w', 640, $extract['image'] ) );
+				} else {
+					list( $og_tags, $card_type ) = self::twitter_cards_define_type_based_on_image_count( $og_tags, $extract );
+				}
+			}
+		}
+
+		$og_tags['twitter:card'] = $card_type;
+
+		// Make sure we have a description for Twitter, their validator isn't happy without some content (single space not valid).
+		if ( ! isset( $og_tags['og:description'] ) || '' === trim( $og_tags['og:description'] ) || __( 'Visit the post for more.', 'jetpack-post-media' ) === $og_tags['og:description'] ) { // empty( trim( $og_tags['og:description'] ) ) isn't valid php.
+			$has_creator = ! empty( $og_tags['twitter:creator'] ) && '@wordpressdotcom' !== $og_tags['twitter:creator'];
+			if ( ! empty( $extract ) && 'video' === $extract['type'] ) { // use $extract['type'] since $card_type is 'summary' for video posts.
+				/* translators: %s is the post author */
+				$og_tags['twitter:description'] = ( $has_creator ) ? sprintf( __( 'Video post by %s.', 'jetpack-post-media' ), $og_tags['twitter:creator'] ?? '' ) : __( 'Video post.', 'jetpack-post-media' );
+			} else {
+				/* translators: %s is the post author */
+				$og_tags['twitter:description'] = ( $has_creator ) ? sprintf( __( 'Post by %s.', 'jetpack-post-media' ), $og_tags['twitter:creator'] ?? '' ) : __( 'Visit the post for more.', 'jetpack-post-media' );
+			}
+		}
+
+		if ( empty( $og_tags['twitter:image'] ) && empty( $og_tags['twitter:image:src'] ) ) {
+			/** This action is documented in class-twitter-cards.php */
+			$image = apply_filters( 'jetpack_twitter_cards_image_default', '' );
+			if ( ! empty( $image ) ) {
+				$og_tags['twitter:image'] = $image;
+			}
+		}
+
+		return $og_tags;
+	}
+
+	/**
+	 * Sanitize the Twitter user by normalizing the @.
+	 *
+	 * @param string $str Twitter user value.
+	 *
+	 * @return string Twitter user value.
+	 */
+	public static function sanitize_twitter_user( $str ) {
+		return '@' . preg_replace( '/^@/', '', $str );
+	}
+
+	/**
+	 * Determines if a site tag is one of the default WP.com/Jetpack ones.
+	 *
+	 * @param string $site_tag Site tag.
+	 *
+	 * @return bool True if the default site tag is being used.
+	 */
+	public static function is_default_site_tag( $site_tag ) {
+		return in_array( $site_tag, array( '@wordpressdotcom', '@jetpack', 'wordpressdotcom', 'jetpack' ), true );
+	}
+
+	/**
+	 * Give priority to the creator tag if using the default site tag.
+	 *
+	 * @param string $site_tag Site tag.
+	 * @param array  $og_tags OG tags.
+	 *
+	 * @return string Site tag.
+	 */
+	public static function prioritize_creator_over_default_site( $site_tag, $og_tags = array() ) {
+		if ( ! empty( $og_tags['twitter:creator'] ) && self::is_default_site_tag( $site_tag ) ) {
+			return $og_tags['twitter:creator'];
+		}
+		return $site_tag;
+	}
+
+	/**
+	 * Define the Twitter Card type based on image count.
+	 *
+	 * @param array $og_tags Existing OG tags.
+	 * @param array $extract Result of the Image Extractor class.
+	 *
+	 * @return array
+	 */
+	public static function twitter_cards_define_type_based_on_image_count( $og_tags, $extract ) {
+		$card_type = 'summary';
+		$img_count = $extract['count']['image'];
+
+		if ( empty( $img_count ) ) {
+
+			// No images, use Blavatar as a thumbnail for the summary type.
+			// @todo blavatar_domain, blavatar_exists, and blavatar_url are WordPress.com functions. They should be abstracted.
+			if ( function_exists( 'blavatar_domain' ) ) {
+				$blavatar_domain = blavatar_domain( site_url() ); // @phan-suppress-current-line PhanUndeclaredFunction -- Guarded by function_exists().
+				if ( blavatar_exists( $blavatar_domain ) ) { // @phan-suppress-current-line PhanUndeclaredFunction -- Guarded by function_exists().
+					$og_tags['twitter:image'] = blavatar_url( $blavatar_domain, 'img', 240 ); // @phan-suppress-current-line PhanUndeclaredFunction -- Guarded by function_exists().
+				}
+			}
+
+			// Second fall back, Site Logo.
+			// @todo jetpack_has_site_logo and jetpack_get_site_logo are defined in the Jetpack plugin. They should be abstracted.
+			if ( empty( $og_tags['twitter:image'] ) && ( function_exists( 'jetpack_has_site_logo' ) && jetpack_has_site_logo() ) ) { // @phan-suppress-current-line PhanUndeclaredFunction -- Guarded by function_exists().
+				$og_tags['twitter:image'] = jetpack_get_site_logo( 'url' ); // @phan-suppress-current-line PhanUndeclaredFunction -- Guarded by function_exists().
+			}
+
+			// Third fall back, Site Icon.
+			if ( empty( $og_tags['twitter:image'] ) && has_site_icon() ) {
+				$og_tags['twitter:image'] = get_site_icon_url( 240 );
+			}
+
+			// Not falling back on Gravatar, because there's no way to know if we end up with an auto-generated one.
+
+		} elseif ( 'image' === $extract['type'] || 'gallery' === $extract['type'] ) {
+			// Test for $extract['type'] to limit to image and gallery, so we don't send a potential fallback image like a Gravatar as a photo post.
+			$card_type                = 'summary_large_image';
+			$og_tags['twitter:image'] = esc_url( add_query_arg( 'w', 1400, ( empty( $extract['images'] ) ) ? $extract['image'] : $extract['images'][0]['url'] ) );
+		}
+
+		return array( $og_tags, $card_type );
+	}
+
+	/**
+	 * Updates the Twitter Card output.
+	 *
+	 * @param string $og_tag A single OG tag.
+	 *
+	 * @return string Result of the OG tag.
+	 */
+	public static function twitter_cards_output( $og_tag ) {
+		return ( str_contains( $og_tag, 'twitter:' ) ) ? preg_replace( '/property="([^"]+)"/', 'name="\1"', $og_tag ) : $og_tag;
+	}
+
+	/**
+	 * Adds settings section and field.
+	 */
+	public static function settings_init() {
+		add_settings_section( 'jetpack-twitter-cards-settings', 'Twitter Cards', '__return_false', 'sharing' );
+		add_settings_field(
+			'jetpack-twitter-cards-site-tag',
+			__( 'Twitter Site Tag', 'jetpack-post-media' ),
+			array( __CLASS__, 'settings_field' ),
+			'sharing',
+			'jetpack-twitter-cards-settings',
+			array(
+				'label_for' => 'jetpack-twitter-cards-site-tag',
+			)
+		);
+	}
+
+	/**
+	 * Add global sharing options.
+	 */
+	public static function sharing_global_options() {
+		do_settings_fields( 'sharing', 'jetpack-twitter-cards-settings' );
+	}
+
+	/**
+	 * Get the Twitter Via tag.
+	 *
+	 * @return string Twitter via tag.
+	 */
+	public static function site_tag() {
+		$site_tag = ( defined( 'IS_WPCOM' ) && IS_WPCOM ) ?
+			trim( get_option( 'twitter_via' ) ) :
+			( class_exists( 'Jetpack_Options' ) ? \Jetpack_Options::get_option_and_ensure_autoload( 'jetpack-twitter-cards-site-tag', '' ) : get_option( 'jetpack-twitter-cards-site-tag', '' ) );
+		if ( empty( $site_tag ) ) {
+			/** This action is documented in modules/sharedaddy/sharing-sources.php */
+			return apply_filters( 'jetpack_sharing_twitter_via', '', null );
+		}
+		return $site_tag;
+	}
+
+	/**
+	 * Output the settings field.
+	 */
+	public static function settings_field() {
+		wp_nonce_field( 'jetpack-twitter-cards-settings', 'jetpack_twitter_cards_nonce', false );
+		?>
+		<input type="text" id="jetpack-twitter-cards-site-tag" class="regular-text" name="jetpack-twitter-cards-site-tag" value="<?php echo esc_attr( get_option( 'jetpack-twitter-cards-site-tag' ) ); ?>" />
+		<p class="description" style="width: auto;"><?php esc_html_e( 'The Twitter username of the owner of this site\'s domain.', 'jetpack-post-media' ); ?></p>
+		<?php
+	}
+
+	/**
+	 * Validate the settings submission.
+	 */
+	public static function settings_validate() {
+		if ( isset( $_POST['jetpack_twitter_cards_nonce'] ) && wp_verify_nonce( $_POST['jetpack_twitter_cards_nonce'], 'jetpack-twitter-cards-settings' ) ) { // phpcs:ignore WordPress.Security.ValidatedSanitizedInput.MissingUnslash, WordPress.Security.ValidatedSanitizedInput.InputNotSanitized
+			update_option( 'jetpack-twitter-cards-site-tag', isset( $_POST['jetpack-twitter-cards-site-tag'] ) ? trim( ltrim( wp_strip_all_tags( filter_var( wp_unslash( $_POST['jetpack-twitter-cards-site-tag'] ) ) ), '@' ) ) : '' );
+		}
+	}
+
+	/**
+	 * Initiates the class by registering all WordPress hooks.
+	 */
+	public static function init() {
+		add_filter( 'jetpack_open_graph_tags', array( __CLASS__, 'twitter_cards_tags' ), 11 ); // $priority=11: this should hook into jetpack_open_graph_tags after 'class.jetpack-seo.php' has done so.
+		add_filter( 'jetpack_open_graph_output', array( __CLASS__, 'twitter_cards_output' ) );
+		add_filter( 'jetpack_twitter_cards_site_tag', array( __CLASS__, 'site_tag' ), -99 );
+		add_filter( 'jetpack_twitter_cards_site_tag', array( __CLASS__, 'prioritize_creator_over_default_site' ), 99, 2 );
+		add_action( 'admin_init', array( __CLASS__, 'settings_init' ) );
+		add_action( 'sharing_global_options', array( __CLASS__, 'sharing_global_options' ) );
+		add_action( 'sharing_admin_update', array( __CLASS__, 'settings_validate' ) );
+	}
+}