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

<?php

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

class WPCOM_JSON_API_List_Embeds_Endpoint extends WPCOM_JSON_API_Endpoint {
	// /sites/%s/embeds -> $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
		$output = array( 'embeds' => array() );

		if ( ! function_exists( '_wp_oembed_get_object' ) ) {
			require_once( ABSPATH . WPINC . '/class-oembed.php' );
		}

		global $wp_embed;
		$oembed = _wp_oembed_get_object();

		foreach( $wp_embed->handlers as $priority => $handlers ) {
			foreach( $handlers as $handler ) {
				if ( ! empty( $handler['regex'] ) )
					$output['embeds'][] = $handler['regex'];
			}
		}

		foreach ( $oembed->providers as $regex => $oembed_info ) {
			if ( ! empty( $regex ) )
				$output['embeds'][] = $regex;
		}

		return $output;
	}
}