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

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+<?php
+/**
+ * VideoPress Block.
+ *
+ * @since 11.1.0
+ *
+ * @package automattic/jetpack
+ */
+
+namespace Automattic\Jetpack\Extensions\VideoPress;
+
+use Automattic\Jetpack\Blocks;
+use Automattic\Jetpack\Modules;
+use Jetpack_Gutenberg;
+
+if ( ! defined( 'ABSPATH' ) ) {
+	exit( 0 );
+}
+
+const FEATURE_NAME   = 'videopress-block';
+const FEATURE_FOLDER = 'videopress';
+const BLOCK_NAME     = 'jetpack/' . FEATURE_NAME;
+
+/**
+ * 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() {
+	/*
+	 * The block is available even when the module is not active,
+	 * so we can display a nudge to activate the module instead of the block.
+	 * However, since non-admins cannot activate modules, we do not display the empty block for them.
+	 */
+	if ( ! ( new Modules() )->is_active( 'videopress' ) && ! current_user_can( 'jetpack_activate_modules' ) ) {
+		return;
+	}
+
+	Blocks::jetpack_register_block(
+		BLOCK_NAME,
+		array( 'render_callback' => __NAMESPACE__ . '\load_assets' )
+	);
+}
+add_action( 'init', __NAMESPACE__ . '\register_block' );
+
+/**
+ * VideoPress block registration/dependency declaration.
+ *
+ * @param array  $attrs   Array containing the VideoPress block attributes.
+ * @param string $content String containing the VideoPress block content.
+ *
+ * @return string
+ */
+function load_assets( $attrs, $content ) {
+	// Do not render the block if the module is not active.
+	if ( ! ( new Modules() )->is_active( 'videopress' ) ) {
+		return '';
+	}
+
+	Jetpack_Gutenberg::load_assets_as_required( FEATURE_FOLDER );
+	return $content;
+}