1 files changed, 57 insertions, 0 deletions
diff --git a/plugins/jetpack/jetpack_vendor/automattic/jetpack-google-fonts-provider/src/class-utils.php b/plugins/jetpack/jetpack_vendor/automattic/jetpack-google-fonts-provider/src/class-utils.php
new file mode 100644
index 00000000..3ea69559
--- /dev/null
+++ b/plugins/jetpack/jetpack_vendor/automattic/jetpack-google-fonts-provider/src/class-utils.php
@@ -0,0 +1,57 @@
+<?php
+/**
+ * Google Fonts package Utils class file.
+ *
+ * @package automattic/jetpack-google-fonts-provider
+ */
+
+namespace Automattic\Jetpack\Fonts;
+
+/**
+ * Provides utility methods for the Google Fonts Provider package.
+ */
+class Utils {
+	/**
+	 * Adds a preconnect link for improving performance when downloading Google Font files.
+	 * Only do so if the site supports the Webfonts API.
+	 *
+	 * @param array  $urls          Array of resources and their attributes, or URLs to print for resource hints.
+	 * @param string $relation_type The relation type the URLs are printed for, e.g. 'preconnect' or 'prerender'.
+	 */
+	public static function font_source_resource_hint( $urls, $relation_type ) {
+		if (
+			'preconnect' === $relation_type
+			&& class_exists( 'WP_Webfonts_Provider' )
+		) {
+			$urls[] = array(
+				'href' => 'https://fonts.gstatic.com',
+				'crossorigin',
+			);
+		}
+
+		return $urls;
+	}
+
+	/**
+	 * Check if a font family is registered (verifying that it can be enqueued).
+	 *
+	 * This function will not be needed if/when WP_Webfonts provides this functionality.
+	 *
+	 * @link https://github.com/WordPress/gutenberg/pull/39988
+	 * @link https://github.com/WordPress/gutenberg/blob/e94fffae0684aa5a6dc370ce3eba262cb77071d9/lib/experimental/class-wp-webfonts.php#L217
+	 *
+	 * @param string $font_family_name Name of font family.
+	 * @return boolean|void Whether the font family is registered, or void if WP_Webfonts is not available.
+	 */
+	public static function is_font_family_registered( $font_family_name ) {
+		if ( ! function_exists( 'wp_webfonts' ) || ! method_exists( 'WP_Webfonts', 'get_font_slug' ) ) {
+			return;
+		}
+
+		$wp_webfonts = wp_webfonts();
+
+		$slug = \WP_Webfonts::get_font_slug( $font_family_name );
+
+		return isset( $wp_webfonts->get_registered_webfonts()[ $slug ] );
+	}
+}