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wp-content/plugins/jetpack/extensions/blocks/like/like.php

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+<?php
+/**
+ * Like Block.
+ *
+ * @since 12.9
+ *
+ * @package automattic/jetpack
+ */
+
+namespace Automattic\Jetpack\Extensions\Like;
+
+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() {
+	$is_wpcom     = defined( 'IS_WPCOM' ) && IS_WPCOM;
+	$is_connected = \Jetpack::is_connection_ready();
+
+	if ( $is_wpcom || $is_connected ) {
+		Blocks::jetpack_register_block(
+			__DIR__,
+			array(
+				'api_version'     => 3,
+				'render_callback' => __NAMESPACE__ . '\render_block',
+				'description'     => $is_wpcom ? __( 'Give your readers the ability to show appreciation for your posts and easily share them with others.', 'jetpack' ) : __( 'Give your readers the ability to show appreciation for your posts.', 'jetpack' ),
+			)
+		);
+	}
+}
+add_action( 'init', __NAMESPACE__ . '\register_block' );
+
+/**
+ * Like block render function.
+ *
+ * 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 Like block attributes.
+ * @param string $content String containing the Like block content.
+ * @param object $block Object containing the Like block data.
+ *
+ * @return string
+ */
+function render_block( $attr, $content, $block ) {
+	require_once __DIR__ . '/render.php';
+	return render_block_implementation( $attr, $content, $block );
+}