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wp-content/plugins/jetpack/extensions/blocks/google-docs-embed/google-docs-embed.php

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+<?php
+/**
+ * GSuite Block.
+ *
+ * @since 11.3
+ *
+ * @package automattic/jetpack
+ */
+
+namespace Automattic\Jetpack\Extensions\GoogleDocsEmbed;
+
+use Automattic\Jetpack\Blocks;
+
+if ( ! defined( 'ABSPATH' ) ) {
+	exit( 0 );
+}
+
+/**
+ * Registers the blocks for use in Gutenberg
+ * This is done via an action so that we can disable
+ * registration if we need to.
+ */
+function register_blocks() {
+
+	Blocks::jetpack_register_block(
+		__DIR__,
+		array(
+			'render_callback' => __NAMESPACE__ . '\render_callback',
+		)
+	);
+}
+add_action( 'init', __NAMESPACE__ . '\register_blocks' );
+
+/**
+ * The block rendering callback.
+ *
+ * The render implementation lives in render.php and is only loaded when the
+ * block is actually rendered, keeping it out of the eager front-end path.
+ *
+ * @param array $attributes attributes.
+ * @return string
+ */
+function render_callback( $attributes ) {
+	require_once __DIR__ . '/render.php';
+	return render_callback_implementation( $attributes );
+}
+
+/**
+ * Convert GSuite URL to a preview URL.
+ *
+ * @param string $url The URL of the published Doc/Spreadsheet/Presentation.
+ *
+ * @return string
+ */
+function map_gsuite_url( $url ) {
+
+	// Default regex for all the URLs.
+	$gsuite_regex = '/^(http|https):\/\/(docs\.google.com)\/(spreadsheets|document|presentation)\/d\/([A-Za-z0-9_-]+).*?$/i';
+
+	/**
+	 * Check if the URL is valid.
+	 *
+	 * If not, return the original URL as is.
+	 */
+	preg_match( $gsuite_regex, $url, $matches );
+	if (
+		empty( $matches ) ||
+		empty( $matches[1] ) ||
+		empty( $matches[2] ) ||
+		empty( $matches[3] ) ||
+		empty( $matches[4] )
+	) {
+		return $url;
+	}
+
+	return "{$matches[1]}://$matches[2]/$matches[3]/d/$matches[4]/preview";
+}