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wp-content/plugins/jetpack/extensions/blocks/google-calendar/google-calendar.php

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+<?php
+/**
+ * Google Calendar Block.
+ *
+ * @since 8.3.0
+ *
+ * @package automattic/jetpack
+ */
+
+namespace Automattic\Jetpack\Extensions\Google_Calendar;
+
+use Automattic\Jetpack\Blocks;
+
+if ( ! defined( 'ABSPATH' ) ) {
+	exit( 0 );
+}
+
+/**
+ * Registers the block for use in Gutenberg
+ * This is done via an action so that we can disable
+ * registration if we need to.
+ */
+function register_block() {
+	Blocks::jetpack_register_block(
+		__DIR__,
+		array(
+			'render_callback' => __NAMESPACE__ . '\load_assets',
+		)
+	);
+}
+add_action( 'init', __NAMESPACE__ . '\register_block' );
+
+/**
+ * Google Calendar block registration/dependency declaration.
+ *
+ * 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 $attr Array containing the Google Calendar block attributes.
+ * @return string
+ */
+function load_assets( $attr ) {
+	require_once __DIR__ . '/render.php';
+	return render_implementation( $attr );
+}

wp-content/plugins/jetpack/extensions/blocks/google-calendar/render.php

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+<?php
+/**
+ * Google Calendar block render implementation.
+ *
+ * Loaded lazily from google-calendar.php only when the block is rendered, to keep
+ * the render body out of the eager front-end PHP/opcache footprint.
+ *
+ * @package automattic/jetpack
+ */
+
+namespace Automattic\Jetpack\Extensions\Google_Calendar;
+
+use Automattic\Jetpack\Blocks;
+use Jetpack_Gutenberg;
+
+if ( ! defined( 'ABSPATH' ) ) {
+	exit( 0 );
+}
+
+/**
+ * Dynamic rendering of the block.
+ *
+ * @param array $attr Array containing the Google Calendar block attributes.
+ * @return string
+ */
+function render_implementation( $attr ) {
+	$height  = $attr['height'] ?? '600';
+	$url     = isset( $attr['url'] )
+		? Jetpack_Gutenberg::validate_block_embed_url( $attr['url'], array( 'calendar.google.com' ) ) :
+		'';
+	$classes = Blocks::classes( Blocks::get_block_feature( __DIR__ ), $attr );
+
+	Jetpack_Gutenberg::load_assets_as_required( __DIR__ );
+
+	if ( empty( $url ) ) {
+		return '';
+	}
+
+	$sandbox = 'allow-scripts allow-same-origin allow-popups';
+	if ( Blocks::is_amp_request() ) {
+		$noscript_src = str_replace(
+			'//calendar.google.com/calendar/embed',
+			'//calendar.google.com/calendar/htmlembed',
+			$url
+		);
+
+		$iframe = sprintf(
+			'<amp-iframe src="%1$s" frameborder="0" scrolling="no" height="%2$d" layout="fixed-height" sandbox="%3$s">%4$s%5$s</amp-iframe>',
+			esc_url( $url ),
+			absint( $height ),
+			esc_attr( $sandbox ),
+			sprintf(
+				'<a href="%s" placeholder>%s</a>',
+				esc_url( $url ),
+				esc_html__( 'Google Calendar', 'jetpack' )
+			),
+			sprintf(
+				'<noscript><iframe src="%1$s" frameborder="0" scrolling="no" sandbox="%2$s"></iframe></noscript>',
+				esc_url( $noscript_src ),
+				esc_attr( $sandbox )
+			)
+		);
+	} else {
+		$iframe = sprintf(
+			'<iframe src="%1$s" frameborder="0" style="border:0" scrolling="no" height="%2$d" width="100%%" sandbox="%3$s"></iframe>',
+			esc_url( $url ),
+			absint( $height ),
+			esc_attr( $sandbox )
+		);
+	}
+
+	return sprintf( '<div class="%s">%s</div>', esc_attr( $classes ), $iframe );
+}