ference. Default null.
 * }
 * @return string|false The URL of the avatar on success, false on failure.
 */
function get_avatar_url( $id_or_email, $args = null ) {
	$args = get_avatar_data( $id_or_email, $args );
	return $args['url'];
}

/**
 * Check if this comment type allows avatars to be retrieved.
 *
 * @since 5.1.0
 *
 * @param string $comment_type Comment type to check.
 * @return bool Whether the comment type is allowed for retrieving avatars.
 */
function is_avatar_comment_type( $comment_type ) {
	/**
	 * Filters the list of allowed comment types for retrieving avatars.
	 *
	 * @since 3.0.0
	 *
	 * @param array $types An array of content types. Default only contains 'comment'.
	 */
	$allowed_comment_types = apply_filters( 'get_avatar_comment_types', array( 'comment' ) );

	return in_array( $comment_type, (array) $allowed_comment_types, true );
}

/**
 * Retrieves default data about the avatar.
 *
 * @since 4.2.0
 *
 * @param mixed $id_or_email The avatar to retrieve. Accepts a user ID, Gravatar MD5 hash,
 *                           user email, WP_User object, WP_Post object, or WP_Comment object.
 * @param array $args {
 *     Optional. Arguments to use instead of the default arguments.
 *
 *     @type int    $size           Height and width of the avatar in pixels. Default 96.
 *     @type int    $height         Display height of the avatar in pixels. Defaults to $size.
 *     @type int    $width          Display width of the avatar in pixels. Defaults to $size.
 *     @type string $default        URL for the default image or a default type. Accepts:
 *                                  - '404' (return a 404 instead of a default image)
 *                                  - 'retro' (a 8-bit arcade-style pixelated face)
 *                                  - 'robohash' (a robot)
 *                                  - 'monsterid' (a monster)
 *                                  - 'wavatar' (a cartoon face)
 *                                  - 'identicon' (the "quilt", a geometric pattern)
 *                                  - 'mystery', 'mm', or 'mysteryman' (The Oyster Man)
 *                                  - 'blank' (transparent GIF)
 *                                  - 'gravatar_default' (the Gravatar logo)
 *                                  Default is the value of the 'avatar_default' option,
 *                                  with a fallback of 'mystery'.
 *     @type bool   $force_default  Whether to always show the default image, never the Gravatar.
 *                                  Default false.
 *     @type string $rating         What rating to display avatars up to. Accepts:
 *                                  - 'G' (suitable for all audiences)
 *                                  - 'PG' (possibly offensive, usually for audiences 13 and above)
 *                                  - 'R' (intended for adult audiences above 17)
 *                                  - 'X' (even more mature than above)
 *                                  Default is the value of the 'avatar_rating' option.
 *     @type string $scheme         URL scheme to use. See set_url_scheme() for accepted values.
 *                                  Default null.
 *     @type array  $processed_args When the function returns, the value will be the processed/sanitized $args
 *                                  plus a "found_avatar" guess. Pass as a reference. Default null.
 *     @type string $extra_attr     HTML attributes to insert in the IMG element. Is not sanitized.
 *                                  Default empty.
 * }
 * @return array {
 *     Along with the arguments passed in `$args`, this will contain a couple of extra arguments.
 *
 *     @type bool         $found_avatar True if an avatar was found for this user,
 *                                      false or not set if none was found.
 *     @type string|false $url          The URL of the avatar that was found, or false.
 * }
 */
function get_avatar_data( $id_or_email, $args = null ) {
	$args = wp_parse_args(
		$args,
		array(
			'size'           => 96,
			'height'         => null,
			'width'          => null,
			'default'        => get_option( 'avatar_default', 'mystery' ),
			'force_default'  => false,
			'rating'         => get_option( 'avatar_rating' ),
			'scheme'         => null,
			'processed_args' => null, // If used, should be a reference.
			'extra_attr'     => '',
		)
	);

	if ( is_numeric( $args['size'] ) ) {
		$args['size'] = absint( $args['size'] );
		if ( ! $args['size'] ) {
			$args['size'] = 96;
		}
	} else {
		$args['size'] = 96;
	}

	if ( is_numeric( $args['height'] ) ) {
		$args['height'] = absint( $args['height'] );
		if ( ! $args['height'] ) {
			$args['height'] = $args['size'];
		}
	} else {
		$args['height'] = $args['size'];
	}

	if ( is_numeric( $args['width'] ) ) {
		$args['width'] = absint( $args['width'] );
		if ( ! $args['width'] ) {
			$args['width'] = $args['size'];
		}
	} else {
		$args['width'] = $args['size'];
	}

	if ( empty( $args['default'] ) ) {
		$args['default'] = get_option( 'avatar_default', 'mystery' );
	}

	switch ( $args['default'] ) {
		case 'mm':
		case 'mystery':
		case 'mysteryman':
			$args['default'] = 'mm';
			break;
		case 'gravatar_default':
			$args['default'] = false;
			break;
	}

	$args['force_default'] = (bool) $args['force_default'];

	$args['rating'] = strtolower( $args['rating'] );

	$args['found_avatar'] = false;

	/**
	 * Filters whether to retrieve the avatar URL early.
	 *
	 * Passing a non-null value in the 'url' member of the return array will
	 * effectively short circuit get_avatar_data(), passing the value through
	 * the {@see 'get_avatar_data'} filter and returning early.
	 *
	 * @since 4.2.0
	 *
	 * @param array $args        Arguments passed to get_avatar_data(), after processing.
	 * @param mixed $id_or_email The avatar to retrieve. Accepts a user ID, Gravatar MD5 hash,
	 *                           user email, WP_User object, WP_Post object, or WP_Comment object.
	 */
	$args = apply_filters( 'pre_get_avatar_data', $args, $id_or_email );

	if ( isset( $args['url'] ) ) {
		/** This filter is documented in wp-includes/link-template.php */
		return apply_filters( 'get_avatar_data', $args, $id_or_email );
	}

	$email_hash = '';
	$user       = false;
	$email      = false;

	if ( is_object( $id_or_email ) && isset( $id_or_email->comment_ID ) ) {
		$id_or_email = get_comment( $id_or_email );
	}

	// Process the user identifier.
	if ( is_numeric( $id_or_email ) ) {
		$user = get_user_by( 'id', absint( $id_or_email ) );
	} elseif ( is_string( $id_or_email ) ) {
		if ( str_contains( $id_or_email, '@md5.gravatar.com' ) ) {
			// MD5 hash.
			list( $email_hash ) = explode( '@', $id_or_email );
		} else {
			// Email address.
			$email = $id_or_email;
		}
	} elseif ( $id_or_email instanceof WP_User ) {
		// User object.
		$user = $id_or_email;
	} elseif ( $id_or_email instanceof WP_Post ) {
		// Post object.
		$user = get_user_by( 'id', (int) $id_or_email->post_author );
	} elseif ( $id_or_email instanceof WP_Comment ) {
		if ( ! is_avatar_comment_type( get_comment_type( $id_or_email ) ) ) {
			$args['url'] = false;
			/** This filter is documented in wp-includes/link-template.php */
			return apply_filters( 'get_avatar_data', $args, $id_or_email );
		}

		if ( ! empty( $id_or_email->user_id ) ) {
			$user = get_user_by( 'id', (int) $id_or_email->user_id );
		}
		if ( ( ! $user || is_wp_error( $user ) ) && ! empty( $id_or_email->comment_author_email ) ) {
			$email = $id_or_email->comment_author_email;
		}
	}

	if ( ! $email_hash ) {
		if ( $user ) {
			$email = $user->user_email;
		}

		if ( $email ) {
			$email_hash = md5( strtolower( trim( $email ) ) );
		}
	}

	if ( $email_hash ) {
		$args['found_avatar'] = true;
		$gravatar_server      = hexdec( $email_hash[0] ) % 3;
	} else {
		$gravatar_server = rand( 0, 2 );
	}

	$url_args = array(
		's' => $args['size'],
		'd' => $args['default'],
		'f' => $args['force_default'] ? 'y' : false,
		'r' => $args['rating'],
	);

	if ( is_ssl() ) {
		$url = 'https://secure.gravatar.com/avatar/' . $email_hash;
	} else {
		$url = sprintf( 'http://%d.gravatar.com/avatar/%s', $gravatar_server, $email_hash );
	}

	$url = add_query_arg(
		rawurlencode_deep( array_filter( $url_args ) ),
		set_url_scheme( $url, $args['scheme'] )
	);

	/**
	 * Filters the avatar URL.
	 *
	 * @since 4.2.0
	 *
	 * @param string $url         The URL of the avatar.
	 * @param mixed  $id_or_email The avatar to retrieve. Accepts a user ID, Gravatar MD5 hash,
	 *                            user email, WP_User object, WP_Post object, or WP_Comment object.
	 * @param array  $args        Arguments passed to get_avatar_data(), after processing.
	 */
	$args['url'] = apply_filters( 'get_avatar_url', $url, $id_or_email, $args );

	/**
	 * Filters the avatar data.
	 *
	 * @since 4.2.0
	 *
	 * @param array $args        Arguments passed to get_avatar_data(), after processing.
	 * @param mixed $id_or_email The avatar to retrieve. Accepts a user ID, Gravatar MD5 hash,
	 *                           user email, WP_User object, WP_Post object, or WP_Comment object.
	 */
	return apply_filters( 'get_avatar_data', $args, $id_or_email );
}

/**
 * Retrieves the URL of a file in the theme.
 *
 * Searches in the stylesheet directory before the template directory so themes
 * which inherit from a parent theme can just override one file.
 *
 * @since 4.7.0
 *
 * @param string $file Optional. File to search for in the stylesheet directory.
 * @return string The URL of the file.
 */
function get_theme_file_uri( $file = '' ) {
	$file = ltrim( $file, '/' );

	$stylesheet_directory = get_stylesheet_directory();

	if ( empty( $file ) ) {
		$url = get_stylesheet_directory_uri();
	} elseif ( get_template_directory() !== $stylesheet_directory && file_exists( $stylesheet_directory . '/' . $file ) ) {
		$url = get_stylesheet_directory_uri() . '/' . $file;
	} else {
		$url = get_template_directory_uri() . '/' . $file;
	}

	/**
	 * Filters the URL to a file in the theme.
	 *
	 * @since 4.7.0
	 *
	 * @param string $url  The file URL.
	 * @param string $file The requested file to search for.
	 */
	return apply_filters( 'theme_file_uri', $url, $file );
}

/**
 * Retrieves the URL of a file in the parent theme.
 *
 * @since 4.7.0
 *
 * @param string $file Optional. File to return the URL for in the template directory.
 * @return string The URL of the file.
 */
function get_parent_theme_file_uri( $file = '' ) {
	$file = ltrim( $file, '/' );

	if ( empty( $file ) ) {
		$url = get_template_directory_uri();
	} else {
		$url = get_template_directory_uri() . '/' . $file;
	}

	/**
	 * Filters the URL to a file in the parent theme.
	 *
	 * @since 4.7.0
	 *
	 * @param string $url  The file URL.
	 * @param string $file The requested file to search for.
	 */
	return apply_filters( 'parent_theme_file_uri', $url, $file );
}

/**
 * Retrieves the path of a file in the theme.
 *
 * Searches in the stylesheet directory before the template directory so themes
 * which inherit from a parent theme can just override one file.
 *
 * @since 4.7.0
 *
 * @param string $file Optional. File to search for in the stylesheet directory.
 * @return string The path of the file.
 */
function get_theme_file_path( $file = '' ) {
	$file = ltrim( $file, '/' );

	$stylesheet_directory = get_stylesheet_directory();
	$template_directory   = get_template_directory();

	if ( empty( $file ) ) {
		$path = $stylesheet_directory;
	} elseif ( $stylesheet_directory !== $template_directory && file_exists( $stylesheet_directory . '/' . $file ) ) {
		$path = $stylesheet_directory . '/' . $file;
	} else {
		$path = $template_directory . '/' . $file;
	}

	/**
	 * Filters the path to a file in the theme.
	 *
	 * @since 4.7.0
	 *
	 * @param string $path The file path.
	 * @param string $file The requested file to search for.
	 */
	return apply_filters( 'theme_file_path', $path, $file );
}

/**
 * Retrieves the path of a file in the parent theme.
 *
 * @since 4.7.0
 *
 * @param string $file Optional. File to return the path for in the template directory.
 * @return string The path of the file.
 */
function get_parent_theme_file_path( $file = '' ) {
	$file = ltrim( $file, '/' );

	if ( empty( $file ) ) {
		$path = get_template_directory();
	} else {
		$path = get_template_directory() . '/' . $file;
	}

	/**
	 * Filters the path to a file in the parent theme.
	 *
	 * @since 4.7.0
	 *
	 * @param string $path The file path.
	 * @param string $file The requested file to search for.
	 */
	return apply_filters( 'parent_theme_file_path', $path, $file );
}

/**
 * Retrieves the URL to the privacy policy page.
 *
 * @since 4.9.6
 *
 * @return string The URL to the privacy policy page. Empty string if it doesn't exist.
 */
function get_privacy_policy_url() {
	$url            = '';
	$policy_page_id = (int) get_option( 'wp_page_for_privacy_policy' );

	if ( ! empty( $policy_page_id ) && get_post_status( $policy_page_id ) === 'publish' ) {
		$url = (string) get_permalink( $policy_page_id );
	}

	/**
	 * Filters the URL of the privacy policy page.
	 *
	 * @since 4.9.6
	 *
	 * @param string $url            The URL to the privacy policy page. Empty string
	 *                               if it doesn't exist.
	 * @param int    $policy_page_id The ID of privacy policy page.
	 */
	return apply_filters( 'privacy_policy_url', $url, $policy_page_id );
}

/**
 * Displays the privacy policy link with formatting, when applicable.
 *
 * @since 4.9.6
 *
 * @param string $before Optional. Display before privacy policy link. Default empty.
 * @param string $after  Optional. Display after privacy policy link. Default empty.
 */
function the_privacy_policy_link( $before = '', $after = '' ) {
	echo get_the_privacy_policy_link( $before, $after );
}

/**
 * Returns the privacy policy link with formatting, when applicable.
 *
 * @since 4.9.6
 * @since 6.2.0 Added 'privacy-policy' rel attribute.
 *
 * @param string $before Optional. Display before privacy policy link. Default empty.
 * @param string $after  Optional. Display after privacy policy link. Default empty.
 * @return string Markup for the link and surrounding elements. Empty string if it
 *                doesn't exist.
 */
function get_the_privacy_policy_link( $before = '', $after = '' ) {
	$link               = '';
	$privacy_policy_url = get_privacy_policy_url();
	$policy_page_id     = (int) get_option( 'wp_page_for_privacy_policy' );
	$page_title         = ( $policy_page_id ) ? get_the_title( $policy_page_id ) : '';

	if ( $privacy_policy_url && $page_title ) {
		$link = sprintf(
			'<a class="privacy-policy-link" href="%s" rel="privacy-policy">%s</a>',
			esc_url( $privacy_policy_url ),
			esc_html( $page_title )
		);
	}

	/**
	 * Filters the privacy policy link.
	 *
	 * @since 4.9.6
	 *
	 * @param string $link               The privacy policy link. Empty string if it
	 *                                   doesn't exist.
	 * @param string $privacy_policy_url The URL of the privacy policy. Empty string
	 *                                   if it doesn't exist.
	 */
	$link = apply_filters( 'the_privacy_policy_link', $link, $privacy_policy_url );

	if ( $link ) {
		return $before . $link . $after;
	}

	return '';
}

/**
 * Returns an array of URL hosts which are considered to be internal hosts.
 *
 * By default the list of internal hosts is comprised of the host name of
 * the site's home_url() (as parsed by wp_parse_url()).
 *
 * This list is used when determining if a specified URL is a link to a page on
 * the site itself or a link offsite (to an external host). This is used, for
 * example, when determining if the "nofollow" attribute should be applied to a
 * link.
 *
 * @see wp_is_internal_link
 *
 * @since 6.2.0
 *
 * @return string[] An array of URL hosts.
 */
function wp_internal_hosts() {
	static $internal_hosts;

	if ( empty( $internal_hosts ) ) {
		/**
		 * Filters the array of URL hosts which are considered internal.
		 *
		 * @since 6.2.0
		 *
		 * @param string[] $internal_hosts An array of internal URL hostnames.
		 */
		$internal_hosts = apply_filters(
			'wp_internal_hosts',
			array(
				wp_parse_url( home_url(), PHP_URL_HOST ),
			)
		);
		$internal_hosts = array_unique(
			array_map( 'strtolower', (array) $internal_hosts )
		);
	}

	return $internal_hosts;
}

/**
 * Determines whether or not the specified URL is of a host included in the internal hosts list.
 *
 * @see wp_internal_hosts()
 *
 * @since 6.2.0
 *
 * @param string $link The URL to test.
 * @return bool Returns true for internal URLs and false for all other URLs.
 */
function wp_is_internal_link( $link ) {
	$link = strtolower( $link );
	if ( in_array( wp_parse_url( $link, PHP_URL_SCHEME ), wp_allowed_protocols(), true ) ) {
		return in_array( wp_parse_url( $link, PHP_URL_HOST ), wp_internal_hosts(), true );
	}
	return false;
}
uest Full details about the request.
	 * @return WP_REST_Response|WP_Error Response object on success, or WP_Error object on failure.
	 */
	public function get_items( $request ) {
		$font_family = $this->get_parent_font_family_post( $request['font_family_id'] );
		if ( is_wp_error( $font_family ) ) {
			return $font_family;
		}

		return parent::get_items( $request );
	}

	/**
	 * Retrieves a single font face within the parent font family.
	 *
	 * @since 6.5.0
	 *
	 * @param WP_REST_Request $request Full details about the request.
	 * @return WP_REST_Response|WP_Error Response object on success, or WP_Error object on failure.
	 */
	public function get_item( $request ) {
		$post = $this->get_post( $request['id'] );
		if ( is_wp_error( $post ) ) {
			return $post;
		}

		// Check that the font face has a valid parent font family.
		$font_family = $this->get_parent_font_family_post( $request['font_family_id'] );
		if ( is_wp_error( $font_family ) ) {
			return $font_family;
		}

		if ( (int) $font_family->ID !== (int) $post->post_parent ) {
			return new WP_Error(
				'rest_font_face_parent_id_mismatch',
				/* translators: %d: A post id. */
				sprintf( __( 'The font face does not belong to the specified font family with id of "%d".' ), $font_family->ID ),
				array( 'status' => 404 )
			);
		}

		return parent::get_item( $request );
	}

	/**
	 * Creates a font face for the parent font family.
	 *
	 * @since 6.5.0
	 *
	 * @param WP_REST_Request $request Full details about the request.
	 * @return WP_REST_Response|WP_Error Response object on success, or WP_Error object on failure.
	 */
	public function create_item( $request ) {
		$font_family = $this->get_parent_font_family_post( $request['font_family_id'] );
		if ( is_wp_error( $font_family ) ) {
			return $font_family;
		}

		// Settings have already been decoded by ::sanitize_font_face_settings().
		$settings    = $request->get_param( 'font_face_settings' );
		$file_params = $request->get_file_params();

		// Check that the necessary font face properties are unique.
		$query = new WP_Query(
			array(
				'post_type'              => $this->post_type,
				'posts_per_page'         => 1,
				'title'                  => WP_Font_Utils::get_font_face_slug( $settings ),
				'update_post_meta_cache' => false,
				'update_post_term_cache' => false,
			)
		);
		if ( ! empty( $query->posts ) ) {
			return new WP_Error(
				'rest_duplicate_font_face',
				__( 'A font face matching those settings already exists.' ),
				array( 'status' => 400 )
			);
		}

		// Move the uploaded font asset from the temp folder to the fonts directory.
		if ( ! function_exists( 'wp_handle_upload' ) ) {
			require_once ABSPATH . 'wp-admin/includes/file.php';
		}

		$srcs           = is_string( $settings['src'] ) ? array( $settings['src'] ) : $settings['src'];
		$processed_srcs = array();
		$font_file_meta = array();

		foreach ( $srcs as $src ) {
			// If src not a file reference, use it as is.
			if ( ! isset( $file_params[ $src ] ) ) {
				$processed_srcs[] = $src;
				continue;
			}

			$file      = $file_params[ $src ];
			$font_file = $this->handle_font_file_upload( $file );
			if ( is_wp_error( $font_file ) ) {
				return $font_file;
			}

			$processed_srcs[] = $font_file['url'];
			$font_file_meta[] = $this->relative_fonts_path( $font_file['file'] );
		}

		// Store the updated settings for prepare_item_for_database to use.
		$settings['src'] = count( $processed_srcs ) === 1 ? $processed_srcs[0] : $processed_srcs;
		$request->set_param( 'font_face_settings', $settings );

		// Ensure that $settings data is slashed, so values with quotes are escaped.
		// WP_REST_Posts_Controller::create_item uses wp_slash() on the post_content.
		$font_face_post = parent::create_item( $request );

		if ( is_wp_error( $font_face_post ) ) {
			return $font_face_post;
		}

		$font_face_id = $font_face_post->data['id'];

		foreach ( $font_file_meta as $font_file_path ) {
			add_post_meta( $font_face_id, '_wp_font_face_file', $font_file_path );
		}

		return $font_face_post;
	}

	/**
	 * Deletes a single font face.
	 *
	 * @since 6.5.0
	 *
	 * @param WP_REST_Request $request Full details about the request.
	 * @return WP_REST_Response|WP_Error Response object on success, or WP_Error object on failure.
	 */
	public function delete_item( $request ) {
		$post = $this->get_post( $request['id'] );
		if ( is_wp_error( $post ) ) {
			return $post;
		}

		$font_family = $this->get_parent_font_family_post( $request['font_family_id'] );
		if ( is_wp_error( $font_family ) ) {
			return $font_family;
		}

		if ( (int) $font_family->ID !== (int) $post->post_parent ) {
			return new WP_Error(
				'rest_font_face_parent_id_mismatch',
				/* translators: %d: A post id. */
				sprintf( __( 'The font face does not belong to the specified font family with id of "%d".' ), $font_family->ID ),
				array( 'status' => 404 )
			);
		}

		$force = isset( $request['force'] ) ? (bool) $request['force'] : false;

		// We don't support trashing for font faces.
		if ( ! $force ) {
			return new WP_Error(
				'rest_trash_not_supported',
				/* translators: %s: force=true */
				sprintf( __( 'Font faces do not support trashing. Set "%s" to delete.' ), 'force=true' ),
				array( 'status' => 501 )
			);
		}

		return parent::delete_item( $request );
	}

	/**
	 * Prepares a single font face output for response.
	 *
	 * @since 6.5.0
	 *
	 * @param WP_Post         $item    Post object.
	 * @param WP_REST_Request $request Request object.
	 * @return WP_REST_Response Response object.
	 */
	public function prepare_item_for_response( $item, $request ) {
		$fields = $this->get_fields_for_response( $request );
		$data   = array();

		if ( rest_is_field_included( 'id', $fields ) ) {
			$data['id'] = $item->ID;
		}
		if ( rest_is_field_included( 'theme_json_version', $fields ) ) {
			$data['theme_json_version'] = static::LATEST_THEME_JSON_VERSION_SUPPORTED;
		}

		if ( rest_is_field_included( 'parent', $fields ) ) {
			$data['parent'] = $item->post_parent;
		}

		if ( rest_is_field_included( 'font_face_settings', $fields ) ) {
			$data['font_face_settings'] = $this->get_settings_from_post( $item );
		}

		$context = ! empty( $request['context'] ) ? $request['context'] : 'view';
		$data    = $this->add_additional_fields_to_object( $data, $request );
		$data    = $this->filter_response_by_context( $data, $context );

		$response = rest_ensure_response( $data );

		if ( rest_is_field_included( '_links', $fields ) || rest_is_field_included( '_embedded', $fields ) ) {
			$links = $this->prepare_links( $item );
			$response->add_links( $links );
		}

		/**
		 * Filters the font face data for a REST API response.
		 *
		 * @since 6.5.0
		 *
		 * @param WP_REST_Response $response The response object.
		 * @param WP_Post          $post     Font face post object.
		 * @param WP_REST_Request  $request  Request object.
		 */
		return apply_filters( 'rest_prepare_wp_font_face', $response, $item, $request );
	}

	/**
	 * Retrieves the post's schema, conforming to JSON Schema.
	 *
	 * @since 6.5.0
	 *
	 * @return array Item schema data.
	 */
	public function get_item_schema() {
		if ( $this->schema ) {
			return $this->add_additional_fields_schema( $this->schema );
		}

		$schema = array(
			'$schema'    => 'http://json-schema.org/draft-04/schema#',
			'title'      => $this->post_type,
			'type'       => 'object',
			// Base properties for every Post.
			'properties' => array(
				'id'                 => array(
					'description' => __( 'Unique identifier for the post.', 'default' ),
					'type'        => 'integer',
					'context'     => array( 'view', 'edit', 'embed' ),
					'readonly'    => true,
				),
				'theme_json_version' => array(
					'description' => __( 'Version of the theme.json schema used for the typography settings.' ),
					'type'        => 'integer',
					'default'     => static::LATEST_THEME_JSON_VERSION_SUPPORTED,
					'minimum'     => 2,
					'maximum'     => static::LATEST_THEME_JSON_VERSION_SUPPORTED,
					'context'     => array( 'view', 'edit', 'embed' ),
				),
				'parent'             => array(
					'description' => __( 'The ID for the parent font family of the font face.' ),
					'type'        => 'integer',
					'context'     => array( 'view', 'edit', 'embed' ),
				),
				// Font face settings come directly from theme.json schema
				// See https://schemas.wp.org/trunk/theme.json
				'font_face_settings' => array(
					'description'          => __( 'font-face declaration in theme.json format.' ),
					'type'                 => 'object',
					'context'              => array( 'view', 'edit', 'embed' ),
					'properties'           => array(
						'fontFamily'            => array(
							'description' => __( 'CSS font-family value.' ),
							'type'        => 'string',
							'default'     => '',
							'arg_options' => array(
								'sanitize_callback' => array( 'WP_Font_Utils', 'sanitize_font_family' ),
							),
						),
						'fontStyle'             => array(
							'description' => __( 'CSS font-style value.' ),
							'type'        => 'string',
							'default'     => 'normal',
							'arg_options' => array(
								'sanitize_callback' => 'sanitize_text_field',
							),
						),
						'fontWeight'            => array(
							'description' => __( 'List of available font weights, separated by a space.' ),
							'default'     => '400',
							// Changed from `oneOf` to avoid errors from loose type checking.
							// e.g. a fontWeight of "400" validates as both a string and an integer due to is_numeric check.
							'type'        => array( 'string', 'integer' ),
							'arg_options' => array(
								'sanitize_callback' => 'sanitize_text_field',
							),
						),
						'fontDisplay'           => array(
							'description' => __( 'CSS font-display value.' ),
							'type'        => 'string',
							'default'     => 'fallback',
							'enum'        => array(
								'auto',
								'block',
								'fallback',
								'swap',
								'optional',
							),
							'arg_options' => array(
								'sanitize_callback' => 'sanitize_text_field',
							),
						),
						'src'                   => array(
							'description' => __( 'Paths or URLs to the font files.' ),
							// Changed from `oneOf` to `anyOf` due to rest_sanitize_array converting a string into an array,
							// and causing a "matches more than one of the expected formats" error.
							'anyOf'       => array(
								array(
									'type' => 'string',
								),
								array(
									'type'  => 'array',
									'items' => array(
										'type' => 'string',
									),
								),
							),
							'default'     => array(),
							'arg_options' => array(
								'sanitize_callback' => function ( $value ) {
									return is_array( $value ) ? array_map( array( $this, 'sanitize_src' ), $value ) : $this->sanitize_src( $value );
								},
							),
						),
						'fontStretch'           => array(
							'description' => __( 'CSS font-stretch value.' ),
							'type'        => 'string',
							'arg_options' => array(
								'sanitize_callback' => 'sanitize_text_field',
							),
						),
						'ascentOverride'        => array(
							'description' => __( 'CSS ascent-override value.' ),
							'type'        => 'string',
							'arg_options' => array(
								'sanitize_callback' => 'sanitize_text_field',
							),
						),
						'descentOverride'       => array(
							'description' => __( 'CSS descent-override value.' ),
							'type'        => 'string',
							'arg_options' => array(
								'sanitize_callback' => 'sanitize_text_field',
							),
						),
						'fontVariant'           => array(
							'description' => __( 'CSS font-variant value.' ),
							'type'        => 'string',
							'arg_options' => array(
								'sanitize_callback' => 'sanitize_text_field',
							),
						),
						'fontFeatureSettings'   => array(
							'description' => __( 'CSS font-feature-settings value.' ),
							'type'        => 'string',
							'arg_options' => array(
								'sanitize_callback' => 'sanitize_text_field',
							),
						),
						'fontVariationSettings' => array(
							'description' => __( 'CSS font-variation-settings value.' ),
							'type'        => 'string',
							'arg_options' => array(
								'sanitize_callback' => 'sanitize_text_field',
							),
						),
						'lineGapOverride'       => array(
							'description' => __( 'CSS line-gap-override value.' ),
							'type'        => 'string',
							'arg_options' => array(
								'sanitize_callback' => 'sanitize_text_field',
							),
						),
						'sizeAdjust'            => array(
							'description' => __( 'CSS size-adjust value.' ),
							'type'        => 'string',
							'arg_options' => array(
								'sanitize_callback' => 'sanitize_text_field',
							),
						),
						'unicodeRange'          => array(
							'description' => __( 'CSS unicode-range value.' ),
							'type'        => 'string',
							'arg_options' => array(
								'sanitize_callback' => 'sanitize_text_field',
							),
						),
						'preview'               => array(
							'description' => __( 'URL to a preview image of the font face.' ),
							'type'        => 'string',
							'format'      => 'uri',
							'default'     => '',
							'arg_options' => array(
								'sanitize_callback' => 'sanitize_url',
							),
						),
					),
					'required'             => array( 'fontFamily', 'src' ),
					'additionalProperties' => false,
				),
			),
		);

		$this->schema = $schema;

		return $this->add_additional_fields_schema( $this->schema );
	}

	/**
	 * Retrieves the item's schema for display / public consumption purposes.
	 *
	 * @since 6.5.0
	 *
	 * @return array Public item schema data.
	 */
	public function get_public_item_schema() {

		$schema = parent::get_public_item_schema();

		// Also remove `arg_options' from child font_family_settings properties, since the parent
		// controller only handles the top level properties.
		foreach ( $schema['properties']['font_face_settings']['properties'] as &$property ) {
			unset( $property['arg_options'] );
		}

		return $schema;
	}

	/**
	 * Retrieves the query params for the font face collection.
	 *
	 * @since 6.5.0
	 *
	 * @return array Collection parameters.
	 */
	public function get_collection_params() {
		$query_params = parent::get_collection_params();

		// Remove unneeded params.
		unset(
			$query_params['after'],
			$query_params['modified_after'],
			$query_params['before'],
			$query_params['modified_before'],
			$query_params['search'],
			$query_params['search_columns'],
			$query_params['slug'],
			$query_params['status']
		);

		$query_params['orderby']['default'] = 'id';
		$query_params['orderby']['enum']    = array( 'id', 'include' );

		/**
		 * Filters collection parameters for the font face controller.
		 *
		 * @since 6.5.0
		 *
		 * @param array $query_params JSON Schema-formatted collection parameters.
		 */
		return apply_filters( 'rest_wp_font_face_collection_params', $query_params );
	}

	/**
	 * Get the params used when creating a new font face.
	 *
	 * @since 6.5.0
	 *
	 * @return array Font face create arguments.
	 */
	public function get_create_params() {
		$properties = $this->get_item_schema()['properties'];
		return array(
			'theme_json_version' => $properties['theme_json_version'],
			// When creating, font_face_settings is stringified JSON, to work with multipart/form-data used
			// when uploading font files.
			'font_face_settings' => array(
				'description'       => __( 'font-face declaration in theme.json format, encoded as a string.' ),
				'type'              => 'string',
				'required'          => true,
				'validate_callback' => array( $this, 'validate_create_font_face_settings' ),
				'sanitize_callback' => array( $this, 'sanitize_font_face_settings' ),
			),
		);
	}

	/**
	 * Get the parent font family, if the ID is valid.
	 *
	 * @since 6.5.0
	 *
	 * @param int $font_family_id Supplied ID.
	 * @return WP_Post|WP_Error Post object if ID is valid, WP_Error otherwise.
	 */
	protected function get_parent_font_family_post( $font_family_id ) {
		$error = new WP_Error(
			'rest_post_invalid_parent',
			__( 'Invalid post parent ID.', 'default' ),
			array( 'status' => 404 )
		);

		if ( (int) $font_family_id <= 0 ) {
			return $error;
		}

		$font_family_post = get_post( (int) $font_family_id );

		if ( empty( $font_family_post ) || empty( $font_family_post->ID )
		|| 'wp_font_family' !== $font_family_post->post_type
		) {
			return $error;
		}

		return $font_family_post;
	}

	/**
	 * Prepares links for the request.
	 *
	 * @since 6.5.0
	 *
	 * @param WP_Post $post Post object.
	 * @return array Links for the given post.
	 */
	protected function prepare_links( $post ) {
		// Entity meta.
		return array(
			'self'       => array(
				'href' => rest_url( $this->namespace . '/font-families/' . $post->post_parent . '/font-faces/' . $post->ID ),
			),
			'collection' => array(
				'href' => rest_url( $this->namespace . '/font-families/' . $post->post_parent . '/font-faces' ),
			),
			'parent'     => array(
				'href' => rest_url( $this->namespace . '/font-families/' . $post->post_parent ),
			),
		);
	}

	/**
	 * Prepares a single font face post for creation.
	 *
	 * @since 6.5.0
	 *
	 * @param WP_REST_Request $request Request object.
	 * @return stdClass Post object.
	 */
	protected function prepare_item_for_database( $request ) {
		$prepared_post = new stdClass();

		// Settings have already been decoded by ::sanitize_font_face_settings().
		$settings = $request->get_param( 'font_face_settings' );

		// Store this "slug" as the post_title rather than post_name, since it uses the fontFamily setting,
		// which may contain multibyte characters.
		$title = WP_Font_Utils::get_font_face_slug( $settings );

		$prepared_post->post_type    = $this->post_type;
		$prepared_post->post_parent  = $request['font_family_id'];
		$prepared_post->post_status  = 'publish';
		$prepared_post->post_title   = $title;
		$prepared_post->post_name    = sanitize_title( $title );
		$prepared_post->post_content = wp_json_encode( $settings );

		return $prepared_post;
	}

	/**
	 * Sanitizes a single src value for a font face.
	 *
	 * @since 6.5.0
	 *
	 * @param string $value Font face src that is a URL or the key for a $_FILES array item.
	 * @return string Sanitized value.
	 */
	protected function sanitize_src( $value ) {
		$value = ltrim( $value );
		return false === wp_http_validate_url( $value ) ? (string) $value : sanitize_url( $value );
	}

	/**
	 * Handles the upload of a font file using wp_handle_upload().
	 *
	 * @since 6.5.0
	 *
	 * @param array $file Single file item from $_FILES.
	 * @return array|WP_Error Array containing uploaded file attributes on success, or WP_Error object on failure.
	 */
	protected function handle_font_file_upload( $file ) {
		add_filter( 'upload_mimes', array( 'WP_Font_Utils', 'get_allowed_font_mime_types' ) );
		// Filter the upload directory to return the fonts directory.
		add_filter( 'upload_dir', '_wp_filter_font_directory' );

		$overrides = array(
			'upload_error_handler' => array( $this, 'handle_font_file_upload_error' ),
			// Not testing a form submission.
			'test_form'            => false,
			// Only allow uploading font files for this request.
			'mimes'                => WP_Font_Utils::get_allowed_font_mime_types(),
		);

		// Bypasses is_uploaded_file() when running unit tests.
		if ( defined( 'DIR_TESTDATA' ) && DIR_TESTDATA ) {
			$overrides['action'] = 'wp_handle_mock_upload';
		}

		$uploaded_file = wp_handle_upload( $file, $overrides );

		remove_filter( 'upload_dir', '_wp_filter_font_directory' );
		remove_filter( 'upload_mimes', array( 'WP_Font_Utils', 'get_allowed_font_mime_types' ) );

		return $uploaded_file;
	}

	/**
	 * Handles file upload error.
	 *
	 * @since 6.5.0
	 *
	 * @param array  $file    File upload data.
	 * @param string $message Error message from wp_handle_upload().
	 * @return WP_Error WP_Error object.
	 */
	public function handle_font_file_upload_error( $file, $message ) {
		$status = 500;
		$code   = 'rest_font_upload_unknown_error';

		if ( __( 'Sorry, you are not allowed to upload this file type.' ) === $message ) {
			$status = 400;
			$code   = 'rest_font_upload_invalid_file_type';
		}

		return new WP_Error( $code, $message, array( 'status' => $status ) );
	}

	/**
	 * Returns relative path to an uploaded font file.
	 *
	 * The path is relative to the current fonts directory.
	 *
	 * @since 6.5.0
	 * @access private
	 *
	 * @param string $path Full path to the file.
	 * @return string Relative path on success, unchanged path on failure.
	 */
	protected function relative_fonts_path( $path ) {
		$new_path = $path;

		$fonts_dir = wp_get_font_dir();
		if ( str_starts_with( $new_path, $fonts_dir['basedir'] ) ) {
			$new_path = str_replace( $fonts_dir['basedir'], '', $new_path );
			$new_path = ltrim( $new_path, '/' );
		}

		return $new_path;
	}

	/**
	 * Gets the font face's settings from the post.
	 *
	 * @since 6.5.0
	 *
	 * @param WP_Post $post Font face post object.
	 * @return array Font face settings array.
	 */
	protected function get_settings_from_post( $post ) {
		$settings   = json_decode( $post->post_content, true );
		$properties = $this->get_item_schema()['properties']['font_face_settings']['properties'];

		// Provide required, empty settings if needed.
		if ( null === $settings ) {
			$settings = array(
				'fontFamily' => '',
				'src'        => array(),
			);
		}

		// Only return the properties defined in the schema.
		return array_intersect_key( $settings, $properties );
	}
}