finlabsindia/wp-content/plugins/jetpack/json-endpoints/class.wpcom-json-api-list-shortcodes-endpoint.php

<?php

new WPCOM_JSON_API_List_Shortcodes_Endpoint( array(
	'description' => "Get a list of shortcodes available on a site. Note: The current user must have publishing access.",
	'group'       => 'sites',
	'stat'        => 'shortcodes',
	'method'      => 'GET',
	'path'        => '/sites/%s/shortcodes',
	'path_labels' => array(
		'$site'    => '(int|string) Site ID or domain',
	),
	'response_format' => array(
		'shortcodes' => '(array) A list of supported shortcodes by their handle.',
	),
	'example_request' => 'https://public-api.wordpress.com/rest/v1/sites/82974409/shortcodes',
	'example_request_data' => array(
		'headers' => array(
			'authorization' => 'Bearer YOUR_API_TOKEN'
		),
	)
) );

class WPCOM_JSON_API_List_Shortcodes_Endpoint extends WPCOM_JSON_API_Endpoint {
	// /sites/%s/shortcodes -> $blog_id
	function callback( $path = '', $blog_id = 0 ) {
		$blog_id = $this->api->switch_to_blog_and_validate_user( $this->api->get_blog_id( $blog_id ) );
		if ( is_wp_error( $blog_id ) ) {
			return $blog_id;
		}

		// permissions check
		if ( ! current_user_can( 'edit_posts' ) ) {
			return new WP_Error( 'unauthorized', 'Your token must have permission to post on this blog.', 403 );
		}

		// list em
		global $shortcode_tags;
		$output = array( 'shortcodes' => array() );

		foreach ( $shortcode_tags as $tag => $class ) {
			if ( '__return_false' == $class )
				continue;
			$output['shortcodes'][] = $tag;
		}

		return $output;
	}
}